CA2245098C - Method and apparatus for conveying a logging tool through an earth formation - Google Patents
Method and apparatus for conveying a logging tool through an earth formation Download PDFInfo
- Publication number
- CA2245098C CA2245098C CA002245098A CA2245098A CA2245098C CA 2245098 C CA2245098 C CA 2245098C CA 002245098 A CA002245098 A CA 002245098A CA 2245098 A CA2245098 A CA 2245098A CA 2245098 C CA2245098 C CA 2245098C
- Authority
- CA
- Canada
- Prior art keywords
- cam
- actuator
- borehole
- logging tool
- borehole wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/18—Anchoring or feeding in the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/14—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for displacing a cable or cable-operated tool, e.g. for logging or perforating operations in deviated wells
Abstract
A conveyance apparatus for conveying at least one logging tool through an earth formation traversed by a horizontal or highly deviated borehole is disclosed. The conveyance apparatus comprises a pair of arcuate-shaped cams pivotally mounted to a support member, means for biasing the arcuate surface of each cam into contact with the borehole wall, and actuators operatively connected to each cam. A logging tool is attached to the conveyance apparatus. When either actuator is activated in a first direction, the cam connected to the activated actuator is linearly displaced forward and the arcuate surface of the cam slides along the borehole wall. When either actuator is activated in a second direction, the activated actuator pulls the connected cam backwards and the biasing means thereby urges the arcuate surface of the cam to lock against the borehole wall. Once the cam is locked, further movement of the actuator propels both the conveyance apparatus and the logging tool forward along the highly deviated or horizontal borehole.
Description
''5. 1 76 METHOD AND APPARATUS FOR CONVEYING A LOGGING TOOL
THROUGH AN EARTH FORMATION
~r~rcnncl of th~ Inventinn S The present invention relates gencrally to a logging tool conveyance system. and more particularly, to a met_od and a~ us for conveying a logging tool through an earth formation traversed by a h~ or highly deviated borehole.
To ecol"~".;r~lly pr~ducc hy~Locall,ons from a reservoir, it has become hl,,lGa~ gly c~.. nn to drill a borehole. through an earth formation, which deviates from 10 the traditional vertical o~ n The d~i..i,oll may result from dnlling a borehole using either a sharp or gradually illclGa~illg angle away from the vertical axis. The deviation may also result from drilling a borehole which extends h--- ;7~ y from the vertical axis. It is well known in the art to attempt the logging of foml~tior c surrounding such deviated or h~.,iLo"tal boreholes with logging tools lowered into the wellbore on a wireline and/or a cable. Such tools usually depend upon the force of gravity to permit poSitioning of the tool within the borehole. However, when the bo,chole is drilled at a s~lffriently high angle, the force of gravity on the tool and wireline is ;..C..rr.~;. ..1 to ov~,~ollle the friction e .ro~ Gd by the tool and wireline against the highly deviated portion of the borehole wall. Stiff devices, such as drill pipe and coiled tubing, have been used for conveyance of logging 20 tools in ho.;,o.~t~l and highly deviated boreholes. Often times, many hours of work are requircd to convey logging tools in this fashion. ~ullllellllulc, coiled tubing conveyance is limited in reach due to helical buc~lin~. Thus, it has become ecc~nti~l to provide an economical and eAlcA;P ~ means o~ conveying a logging tool through the ho,izo,l~l or highly deviated portion of a borehole.
~5. ] 76 Surnrnarv of the Tnventiorl The above disadvantages of the prior art are o~c,co,l,e by means of the subJect inventioD for an a~a~aLuS and method for conveying at least one logging tool through an ear~ fv~ ;nn lla~e~ d by a h,..;7.,l~ or highly deviated borehole. The conveyance pa~aLuS C~ ;c~5 a pair of arcuate-shaped ca~ns pivotally mollnt~ A to a support member, means for biasing the arcuate surface of each cam into contact with the borehole wall, and artl~t~rs operatively c~ t~ ~ to each cam. A logging tool is ~ r~ tO the conveyance ay~alalus. When either actuator is ac1iv~d in a first dilcctio,l, the carn col.ne~l.ed to the activated au,Lu~Lul iS linearly ~ r~d fOI~al~l and the arcuate surface of the carn s}ides 10 along the borehole wall. When either r~ t~l iS ac~vated in â second direction, the activated ~tuâlol pulls the cc.l..~-Y r.~ cam bac~walds and the biasing means thereby urges the arcuate surface of the cam to lock against the borehole wall. Once the cam is locked, further movernent of the a~;Lu~Lol propels both the conveyance a~yal~tus and the logging tool forward along the highly deviated or h..lizo~ l borehole.
The method for conveying at least onc logging tool through an earth fol~llaLiol~traversed by â ho~ l or highly deviated borehole co~ es the step of providing a conveyance a~lus having a pair of arcuate-shaped cams pivotally ...ou .t~ d to a support member, means for biasing the arcuate surface of each cam into contact with the bol~hole wall, and ac~ ol~ operatively col.n~t~ Ato each cam. At least one logging tool is u l.~d 20 to the conveyance a~p~dl-ls.
In the p~cfe~cd e.l-bo~ . .1 the pair of cams are c~ .P.~usly ol,~l.,tcd. The actuator for a first carn is activated to Ai~pl~re the first carn in a forward direction.
Simult~n~o~lcly, the ~-t~t- r for a second cam is activated to pull the second cam backward thereby locking the arcuate portion against the borehole wall and propelling the conveyance 25 ayyal~sluS and logging tool forward. These actions are reversed such that the ~lu~ol for the first cam is activated to pull the first cam l,ackwd.d thereby locking the arcuate portion against the borehole wall and propelling the conveyance ~ àlUS and logging tool forward - ~ . 1 76 while the ac~ t- r for the second carn is activated to displace the second carn in a forward direcoon. These steps are repeated until the logging tool is conveyed to a pr~edeterm~ned pos~tlon.
In a second ç-..ho l;,,,. .,1 of the invention, the pair of cams are first simlllt~neously 5 operated. The a ~ tor for each cam is cimll~ ly activated to pull each carn backward thereby locking the arcuate portions against the borehole wall and propelling the conveyance a~p~udus and logging tool foIward. Next, the ~rt~l~tors are çequenti~lly activated to tl;cpl~ each cam in a forward di,e~lion. These steps are repeated until the logging tool is conveyed to a ~ A~ ...;..~ position.
In a third ~.. ho/l;.. - .t of the invention, one a~lUdlOl is leei~ d while the other ~tuator remains stationary. The moving a~lua~l is activated to pull the cam backward thereby locking the arcuate portion against the borehole wall and propelling the conveyance ~p~lUS and logging tool forward. The moving ~~uator is then ~tivated to dicp!~e the cam in the fol ~ d direction. These steps are ..,~at~d until the logging tool is conveyed to 15 a predetermined position.
Brief Description of the Drawin~c The advantages of the present invention will become ~IJa~ ll from the following descli~ion of the acGr....l.~ .ying drawings. It is to be unde~lood that the drawings are to 20 be used for the pùl~ose of illustration only, and not as a definition of the invention.
In the drawings:
Fig. I illu~lldl~s a tool string in a deviated borehole;
Fig. 2 illll~l,dt,_s the conveyance app~alus of the subject invention;
Figs. 3a- 3b depict the conveyance ~ppa,dlus within a small and large 25 r~i~m~tçr borehole; and, Figs. 4a 4c illustrate position, velocity, and force versus time for continuous movement of a conveyance a~pa,~tùs having a pair of cams.
~5. 1 76 Detailed Description of the I}~ d r."hO~l;",. ..L
Fig. 1 s~ 1y illu~ll~s tool string 10 in a deviated borehole 12. The S borehole 12 is typically lined with steel casing c-- ..- .t~ d in place to the formation and may further include production tubing. However, it is within co.,~ .lation of the subject invention to have an open hole well. The tool string 10 comprises at least one logging tool 14 ~tt~h~] by suitable means to a conv~anoe ap~dLus 16. The tool string 10 also includes el~;LIunics for supplying power to the conve~lce a~ ,lus 16. The tool string 10 10 is snspen~ by an armored cable 18. A winch (not shown) is located at the surface and is used to lower and raise the tool string 10 in the vertical portion of borehole 12. In a fel,ud emborlim~-nt of the invention, logging tool 14 is located at a distal end of the tool string 10 and the conveyance a~ alus 16 is located at a l,lo~illlal end of the tool string 10. Altematively, logging tool 14 is located at a proximal end of the tool string 10 and the l S conveyance a~ us 16 is located at a distal end of the tool string 10.
Referring to Fig. 2, the conveyance al~dllls 16 comprises an actuator 24 for linearly displacing cam 20 which is pivotally mounted about a support frarne 22. Cam 2 0 consists of a strong, corrosion and wear resistant material, such as st~inlesc steel. Carn 2 0 comprises a pair of opposing .. "hc, ~ 26a and 26b having an arcuate surface and a 20 means for biasing an arcuate portion of the cam 20 into contact with a wall of the borehole 12. Preferably, the biasing means collll)lise a spring 28 placed between each ...~ ...l~. 26a and 26b and the support frame 22. Spring 28 may consist of a torsion, extension, or col,.p.~ssion spring. In an altemative embo~1im~nt of the invention, spring 28 is placed between members 26a and 26b to bias the op~,osh~g ...~...hc,~ against each other and into 25 contact with a wall of borehole 12. Other means for biasing carn 20 against the borehole 12, including an electro-...rr~ l or hydraulic system, are within conternr! tion of this invention. To further improve the contact between the cam 20 and the borehole 12, cam ~5.176 20 may have snlrlAed or particle .... ~ 29 fixably ~tt~rhr,~ to the arcuate surface. Studs or particles 29 consist of a m~t~ l having high hardness and abrasio~ resicr~nreplu~llies~ such as tl-n~ct~n carbide.
Still lcf~ g to Fig. 2, actuator 24 is opc~vcly cc,....~-1ed to cam 20. Actuator24 comprises a motor 30 for rotating screw 32. The ~ . 24 may further comprise areduction gear box 34 ~licposcd ~t..~n motor 30 and screw 32. Altematively. actuator 24 may consist of other means for linearly ~ cam 20, including, but not limited to, a hydraulic piston powered by a motor driven, hydraulic pump. When the motor 30 is rotated ir~ one direction, screw 32 lincarly ~ es the cam 20 for vard and the arcuate 10 portion slidingly en~ges the borehole wall. When the motor 30 is rotated in the ~ osil~
direction, screw 32 pulls cam 20 ba~ ~d and locks the arcuate portion against the borehole wall 12 and propelling the conv~.cc ~ uS and logging tool forward.
The conveyance apparanls 16 locks or slidingly ~n~rs the borehole wall for a variable ~li,..". ~, borehole 12. figs. 3a- 3b depict the conveyance a~a~lu~ 16 within a 15 small and large ~ -. t ~ borehole 12. The contact angle~ ~, is between a point where an arcuate por~ion of carn 20 COnl~ the borehole wall and a line drawn through the pivot point 40 and peIpendic~ r to the borehole wall 12. The contact angle ruyuil~d to lock carn 20 against the borehole wall relates to the friction cl..u~.istics between cam 20 and the borehole wall 12. The tangent of the contact angle, ~, must be smaller than the c~rr" i.,.~t of friction between the carn and the borehole wall 12 so that ~r~ or 24 locks cam 20 against the borehole wall. To "~COIlll~ r a variable ~ borehole, the contact angle remains cons~ .l as cam 20 pivots inwardly or outwardly to accol.l.lloA~te the borehole m~ter.
In a plel~"cd c,..bod;.-.~ the conv_~.cc ~palduS 16 colllluliscs a pair of actuators 24, 24' for linearly displacing cams 20, 20' which are pivotally mount~d about a support frame 22, 22'. The action of sliding one cam 20 or 20' forward applies a . CA 02245098 1998-08-17 ''5. 1 76 reaction force against the conveyance d~ sldtUs 16 and logging tool 14 tending to move the appdldlUS 16 and logging tool 14 baCkWdl-lS. Similarly, tension in the wireline 18 being pulled into a highly deviated or h~ .ol-l;.l section of the borehole 12 also tend to move the a~dlus 16 and tool 14 backwiuds. The other cam 20~ or 20, which is locked 5 against the borehole wall 12 and not sliding forward, prevents backward movc.~ ,t of the ~J~JaldLUS 16 and logging tool 14.
Figs. 4a4c illustrate position, velocity, and force versus time for continuous movement of the ~lc~ ,d conveyance ap~dlalus 16. In the home position, at t=0, the first actuator 24 is fully e~t~n/~ for a ~lict~nre ap~lu ~"l,dlely equal to the length of screw 32.
10 Also, in the home position, the second a~u~,l 24' is fully .e~ d. In order to convey the logging tool 14, a first motor 30 rotates in one direction and retracts screw 32 which pulls cam 20 backward and locks the all uate portion against the borehole wall 12 and propels the conveyance a~dldlus and logging tool forward. Sim~l~neously, a second motor 30' rotates in one direction and screw 32' linearly displaces the cam 20' forward 15 and the arcuate portion slidingly eng~gçS the borehole wall 12. These actions are then reversed such that the first motor 30 rotates in the o~,~osi~ direction and screw 32 linearly displaces the cam 20 forward and the arcuate portion slidingly eng~geS the borehole wall 12 and simultaneously, the second motor 30' rotates in the c,p~osile direction and retracts screw 32 which pulls cam 20' backw~d and locks the arcuate portion against the borehole 20 wall and propels the conveyance ap~.Lus and logging tool for vard. Figs. 4b-4c show that the net motion of the conveyance al,pdl~us 16 and logging tool 14 are continuous and the speed is inversely ~lopulLiona] to the pulling effort thereby reflecting the ability to supply a limited amount of electrical power via the wireline 18.
In a second embo~im~nt of the invention, the pair of cams 20, 20' are first ''5 operated simult~nçoucly, then sequentially. The actuator 24, 24' for each cam 20, 20' is cimlllt~neously activated to pull each cam 20, 20' backward thereby locking the arcuate portions against the borehole wall 12 and propelling the conveyance a~yaldlus 16 and ~ CA 02245098 1998-08-17 ''5.176 logging tool 14 forward. Next, the ~rtll~tors 24, 24' are sequentially activated to dicpl~re each cam 20, 20' in a fo~ward direction. These steps are repeated until the logging tool 14 is conveyed to a predetu.,llincd position.
In a third e..ho~ of the invention, one actuator 24 or 24' is S leci~,~ed while the other a,.:tudt~r 24 or 24' ,elllail,s stationary. The moving actuator 24 or 24' is activated to pull the cam 20 or 20' backward thereby locking the arcuate portion against the borehole wall 12 and propP1ling the conveyance ~JIJdldLUS 16 and logging tool 14 forward. The moving actuator 24 or 24' is then activated to displace the cam 20 or 20' in the forward direction. These steps are l~aled until the logging tool 14 10 is conveyed to apl~d~t~ ...;.-P~ position.
The foregoing ~IPsrrirtion of the ~ief~llcd and ~ltPm~tP embo~ nl~ of the present invention have been ~l.,se.,t~d for ~UIlJ0~S of illustration and description. It is not in~rrlded to be exhaustive or limit the invention to the preci~ form disclosed. Obviously, many modifications and variations will be a~pd~lll to those slcilled in the art. The embo-i;...~ .-t~
15 were chosen and ~1P.ccribPd in order to best explain the prinrirlp~s of the invention and its practical application thereby enabling others skilled in the art to und~ d the invention for various emborlimPntc and with various mollifir~tions as are suited to the particular use contemplated. It is int~nrlecl that the scope of the invention be defined by the accon,~a"ying claims and their equivalents.
THROUGH AN EARTH FORMATION
~r~rcnncl of th~ Inventinn S The present invention relates gencrally to a logging tool conveyance system. and more particularly, to a met_od and a~ us for conveying a logging tool through an earth formation traversed by a h~ or highly deviated borehole.
To ecol"~".;r~lly pr~ducc hy~Locall,ons from a reservoir, it has become hl,,lGa~ gly c~.. nn to drill a borehole. through an earth formation, which deviates from 10 the traditional vertical o~ n The d~i..i,oll may result from dnlling a borehole using either a sharp or gradually illclGa~illg angle away from the vertical axis. The deviation may also result from drilling a borehole which extends h--- ;7~ y from the vertical axis. It is well known in the art to attempt the logging of foml~tior c surrounding such deviated or h~.,iLo"tal boreholes with logging tools lowered into the wellbore on a wireline and/or a cable. Such tools usually depend upon the force of gravity to permit poSitioning of the tool within the borehole. However, when the bo,chole is drilled at a s~lffriently high angle, the force of gravity on the tool and wireline is ;..C..rr.~;. ..1 to ov~,~ollle the friction e .ro~ Gd by the tool and wireline against the highly deviated portion of the borehole wall. Stiff devices, such as drill pipe and coiled tubing, have been used for conveyance of logging 20 tools in ho.;,o.~t~l and highly deviated boreholes. Often times, many hours of work are requircd to convey logging tools in this fashion. ~ullllellllulc, coiled tubing conveyance is limited in reach due to helical buc~lin~. Thus, it has become ecc~nti~l to provide an economical and eAlcA;P ~ means o~ conveying a logging tool through the ho,izo,l~l or highly deviated portion of a borehole.
~5. ] 76 Surnrnarv of the Tnventiorl The above disadvantages of the prior art are o~c,co,l,e by means of the subJect inventioD for an a~a~aLuS and method for conveying at least one logging tool through an ear~ fv~ ;nn lla~e~ d by a h,..;7.,l~ or highly deviated borehole. The conveyance pa~aLuS C~ ;c~5 a pair of arcuate-shaped ca~ns pivotally mollnt~ A to a support member, means for biasing the arcuate surface of each cam into contact with the borehole wall, and artl~t~rs operatively c~ t~ ~ to each cam. A logging tool is ~ r~ tO the conveyance ay~alalus. When either actuator is ac1iv~d in a first dilcctio,l, the carn col.ne~l.ed to the activated au,Lu~Lul iS linearly ~ r~d fOI~al~l and the arcuate surface of the carn s}ides 10 along the borehole wall. When either r~ t~l iS ac~vated in â second direction, the activated ~tuâlol pulls the cc.l..~-Y r.~ cam bac~walds and the biasing means thereby urges the arcuate surface of the cam to lock against the borehole wall. Once the cam is locked, further movernent of the a~;Lu~Lol propels both the conveyance a~yal~tus and the logging tool forward along the highly deviated or h..lizo~ l borehole.
The method for conveying at least onc logging tool through an earth fol~llaLiol~traversed by â ho~ l or highly deviated borehole co~ es the step of providing a conveyance a~lus having a pair of arcuate-shaped cams pivotally ...ou .t~ d to a support member, means for biasing the arcuate surface of each cam into contact with the bol~hole wall, and ac~ ol~ operatively col.n~t~ Ato each cam. At least one logging tool is u l.~d 20 to the conveyance a~p~dl-ls.
In the p~cfe~cd e.l-bo~ . .1 the pair of cams are c~ .P.~usly ol,~l.,tcd. The actuator for a first carn is activated to Ai~pl~re the first carn in a forward direction.
Simult~n~o~lcly, the ~-t~t- r for a second cam is activated to pull the second cam backward thereby locking the arcuate portion against the borehole wall and propelling the conveyance 25 ayyal~sluS and logging tool forward. These actions are reversed such that the ~lu~ol for the first cam is activated to pull the first cam l,ackwd.d thereby locking the arcuate portion against the borehole wall and propelling the conveyance ~ àlUS and logging tool forward - ~ . 1 76 while the ac~ t- r for the second carn is activated to displace the second carn in a forward direcoon. These steps are repeated until the logging tool is conveyed to a pr~edeterm~ned pos~tlon.
In a second ç-..ho l;,,,. .,1 of the invention, the pair of cams are first simlllt~neously 5 operated. The a ~ tor for each cam is cimll~ ly activated to pull each carn backward thereby locking the arcuate portions against the borehole wall and propelling the conveyance a~p~udus and logging tool foIward. Next, the ~rt~l~tors are çequenti~lly activated to tl;cpl~ each cam in a forward di,e~lion. These steps are repeated until the logging tool is conveyed to a ~ A~ ...;..~ position.
In a third ~.. ho/l;.. - .t of the invention, one a~lUdlOl is leei~ d while the other ~tuator remains stationary. The moving a~lua~l is activated to pull the cam backward thereby locking the arcuate portion against the borehole wall and propelling the conveyance ~p~lUS and logging tool forward. The moving ~~uator is then ~tivated to dicp!~e the cam in the fol ~ d direction. These steps are ..,~at~d until the logging tool is conveyed to 15 a predetermined position.
Brief Description of the Drawin~c The advantages of the present invention will become ~IJa~ ll from the following descli~ion of the acGr....l.~ .ying drawings. It is to be unde~lood that the drawings are to 20 be used for the pùl~ose of illustration only, and not as a definition of the invention.
In the drawings:
Fig. I illu~lldl~s a tool string in a deviated borehole;
Fig. 2 illll~l,dt,_s the conveyance app~alus of the subject invention;
Figs. 3a- 3b depict the conveyance ~ppa,dlus within a small and large 25 r~i~m~tçr borehole; and, Figs. 4a 4c illustrate position, velocity, and force versus time for continuous movement of a conveyance a~pa,~tùs having a pair of cams.
~5. 1 76 Detailed Description of the I}~ d r."hO~l;",. ..L
Fig. 1 s~ 1y illu~ll~s tool string 10 in a deviated borehole 12. The S borehole 12 is typically lined with steel casing c-- ..- .t~ d in place to the formation and may further include production tubing. However, it is within co.,~ .lation of the subject invention to have an open hole well. The tool string 10 comprises at least one logging tool 14 ~tt~h~] by suitable means to a conv~anoe ap~dLus 16. The tool string 10 also includes el~;LIunics for supplying power to the conve~lce a~ ,lus 16. The tool string 10 10 is snspen~ by an armored cable 18. A winch (not shown) is located at the surface and is used to lower and raise the tool string 10 in the vertical portion of borehole 12. In a fel,ud emborlim~-nt of the invention, logging tool 14 is located at a distal end of the tool string 10 and the conveyance a~ alus 16 is located at a l,lo~illlal end of the tool string 10. Altematively, logging tool 14 is located at a proximal end of the tool string 10 and the l S conveyance a~ us 16 is located at a distal end of the tool string 10.
Referring to Fig. 2, the conveyance al~dllls 16 comprises an actuator 24 for linearly displacing cam 20 which is pivotally mounted about a support frarne 22. Cam 2 0 consists of a strong, corrosion and wear resistant material, such as st~inlesc steel. Carn 2 0 comprises a pair of opposing .. "hc, ~ 26a and 26b having an arcuate surface and a 20 means for biasing an arcuate portion of the cam 20 into contact with a wall of the borehole 12. Preferably, the biasing means collll)lise a spring 28 placed between each ...~ ...l~. 26a and 26b and the support frame 22. Spring 28 may consist of a torsion, extension, or col,.p.~ssion spring. In an altemative embo~1im~nt of the invention, spring 28 is placed between members 26a and 26b to bias the op~,osh~g ...~...hc,~ against each other and into 25 contact with a wall of borehole 12. Other means for biasing carn 20 against the borehole 12, including an electro-...rr~ l or hydraulic system, are within conternr! tion of this invention. To further improve the contact between the cam 20 and the borehole 12, cam ~5.176 20 may have snlrlAed or particle .... ~ 29 fixably ~tt~rhr,~ to the arcuate surface. Studs or particles 29 consist of a m~t~ l having high hardness and abrasio~ resicr~nreplu~llies~ such as tl-n~ct~n carbide.
Still lcf~ g to Fig. 2, actuator 24 is opc~vcly cc,....~-1ed to cam 20. Actuator24 comprises a motor 30 for rotating screw 32. The ~ . 24 may further comprise areduction gear box 34 ~licposcd ~t..~n motor 30 and screw 32. Altematively. actuator 24 may consist of other means for linearly ~ cam 20, including, but not limited to, a hydraulic piston powered by a motor driven, hydraulic pump. When the motor 30 is rotated ir~ one direction, screw 32 lincarly ~ es the cam 20 for vard and the arcuate 10 portion slidingly en~ges the borehole wall. When the motor 30 is rotated in the ~ osil~
direction, screw 32 pulls cam 20 ba~ ~d and locks the arcuate portion against the borehole wall 12 and propelling the conv~.cc ~ uS and logging tool forward.
The conveyance apparanls 16 locks or slidingly ~n~rs the borehole wall for a variable ~li,..". ~, borehole 12. figs. 3a- 3b depict the conveyance a~a~lu~ 16 within a 15 small and large ~ -. t ~ borehole 12. The contact angle~ ~, is between a point where an arcuate por~ion of carn 20 COnl~ the borehole wall and a line drawn through the pivot point 40 and peIpendic~ r to the borehole wall 12. The contact angle ruyuil~d to lock carn 20 against the borehole wall relates to the friction cl..u~.istics between cam 20 and the borehole wall 12. The tangent of the contact angle, ~, must be smaller than the c~rr" i.,.~t of friction between the carn and the borehole wall 12 so that ~r~ or 24 locks cam 20 against the borehole wall. To "~COIlll~ r a variable ~ borehole, the contact angle remains cons~ .l as cam 20 pivots inwardly or outwardly to accol.l.lloA~te the borehole m~ter.
In a plel~"cd c,..bod;.-.~ the conv_~.cc ~palduS 16 colllluliscs a pair of actuators 24, 24' for linearly displacing cams 20, 20' which are pivotally mount~d about a support frame 22, 22'. The action of sliding one cam 20 or 20' forward applies a . CA 02245098 1998-08-17 ''5. 1 76 reaction force against the conveyance d~ sldtUs 16 and logging tool 14 tending to move the appdldlUS 16 and logging tool 14 baCkWdl-lS. Similarly, tension in the wireline 18 being pulled into a highly deviated or h~ .ol-l;.l section of the borehole 12 also tend to move the a~dlus 16 and tool 14 backwiuds. The other cam 20~ or 20, which is locked 5 against the borehole wall 12 and not sliding forward, prevents backward movc.~ ,t of the ~J~JaldLUS 16 and logging tool 14.
Figs. 4a4c illustrate position, velocity, and force versus time for continuous movement of the ~lc~ ,d conveyance ap~dlalus 16. In the home position, at t=0, the first actuator 24 is fully e~t~n/~ for a ~lict~nre ap~lu ~"l,dlely equal to the length of screw 32.
10 Also, in the home position, the second a~u~,l 24' is fully .e~ d. In order to convey the logging tool 14, a first motor 30 rotates in one direction and retracts screw 32 which pulls cam 20 backward and locks the all uate portion against the borehole wall 12 and propels the conveyance a~dldlus and logging tool forward. Sim~l~neously, a second motor 30' rotates in one direction and screw 32' linearly displaces the cam 20' forward 15 and the arcuate portion slidingly eng~gçS the borehole wall 12. These actions are then reversed such that the first motor 30 rotates in the o~,~osi~ direction and screw 32 linearly displaces the cam 20 forward and the arcuate portion slidingly eng~geS the borehole wall 12 and simultaneously, the second motor 30' rotates in the c,p~osile direction and retracts screw 32 which pulls cam 20' backw~d and locks the arcuate portion against the borehole 20 wall and propels the conveyance ap~.Lus and logging tool for vard. Figs. 4b-4c show that the net motion of the conveyance al,pdl~us 16 and logging tool 14 are continuous and the speed is inversely ~lopulLiona] to the pulling effort thereby reflecting the ability to supply a limited amount of electrical power via the wireline 18.
In a second embo~im~nt of the invention, the pair of cams 20, 20' are first ''5 operated simult~nçoucly, then sequentially. The actuator 24, 24' for each cam 20, 20' is cimlllt~neously activated to pull each cam 20, 20' backward thereby locking the arcuate portions against the borehole wall 12 and propelling the conveyance a~yaldlus 16 and ~ CA 02245098 1998-08-17 ''5.176 logging tool 14 forward. Next, the ~rtll~tors 24, 24' are sequentially activated to dicpl~re each cam 20, 20' in a fo~ward direction. These steps are repeated until the logging tool 14 is conveyed to a predetu.,llincd position.
In a third e..ho~ of the invention, one actuator 24 or 24' is S leci~,~ed while the other a,.:tudt~r 24 or 24' ,elllail,s stationary. The moving actuator 24 or 24' is activated to pull the cam 20 or 20' backward thereby locking the arcuate portion against the borehole wall 12 and propP1ling the conveyance ~JIJdldLUS 16 and logging tool 14 forward. The moving actuator 24 or 24' is then activated to displace the cam 20 or 20' in the forward direction. These steps are l~aled until the logging tool 14 10 is conveyed to apl~d~t~ ...;.-P~ position.
The foregoing ~IPsrrirtion of the ~ief~llcd and ~ltPm~tP embo~ nl~ of the present invention have been ~l.,se.,t~d for ~UIlJ0~S of illustration and description. It is not in~rrlded to be exhaustive or limit the invention to the preci~ form disclosed. Obviously, many modifications and variations will be a~pd~lll to those slcilled in the art. The embo-i;...~ .-t~
15 were chosen and ~1P.ccribPd in order to best explain the prinrirlp~s of the invention and its practical application thereby enabling others skilled in the art to und~ d the invention for various emborlimPntc and with various mollifir~tions as are suited to the particular use contemplated. It is int~nrlecl that the scope of the invention be defined by the accon,~a"ying claims and their equivalents.
Claims (12)
1. An apparatus for conveying at least one logging tool through an earth formation traversed by a horizontal or deviated borehole, comprising:
a) a cam mounted to a support member, the cam having means for biasing a portion of the cam into contact with a wall of the borehole; and, b) actuator means operatively connected to the cam which, i) when activated in a first direction, linearly displaces the cam forward and the portion slidingly engages the borehole wall, and, ii) when activated in a second direction, pulls the cam backward thereby locking the portion against the borehole wall.
a) a cam mounted to a support member, the cam having means for biasing a portion of the cam into contact with a wall of the borehole; and, b) actuator means operatively connected to the cam which, i) when activated in a first direction, linearly displaces the cam forward and the portion slidingly engages the borehole wall, and, ii) when activated in a second direction, pulls the cam backward thereby locking the portion against the borehole wall.
2. The apparatus of claim 1, wherein the conveyance apparatus comprises a pair of cams, each cam having a respective actuator means operatively connected to the cam.
3. The apparatus of claim 1, wherein the cam further comprises a pair of opposing members mounted to the support member.
4. The apparatus of claim 3 wherein the cam further comprises a pair of biasing means and a first end of each biasing means is attached to the support member and a second end of each biasing means is attached to an opposing member.
5. The apparatus of claim 3 wherein a first end of the biasing means is attached to one opposing member and a second end of the biasing means is attached to the other opposing member.
6. The apparatus of claim 1 wherein the cam has a plurality of studded members attached to the portion of the cam.
7. A method for conveying at least one logging tool through an earth formation traversed by a horizontal or deviated borehole, the steps comprising:
a) providing the conveyance apparatus of claim 1;
b) connecting the conveyance apparatus to the logging tool;
c) activating the actuator means to pull the cam backward thereby locking the portion against the borehole wall;
d) activating the actuator means to displace the cam in a forward direction;
and, e) repeating steps (c) - (d) until the logging tool is conveyed to a predetermined position.
a) providing the conveyance apparatus of claim 1;
b) connecting the conveyance apparatus to the logging tool;
c) activating the actuator means to pull the cam backward thereby locking the portion against the borehole wall;
d) activating the actuator means to displace the cam in a forward direction;
and, e) repeating steps (c) - (d) until the logging tool is conveyed to a predetermined position.
8. The method of claim 7, wherein the conveyance apparatus has a pair of cams, each cam having a respective actuator means operatively connected to the cam.
9. The method of claim 8, steps (c) and (d) further comprising:
i) simultaneously activating each actuator means to displace each cam backward thereby locking the portion against the borehole wall; and, ii) sequentially activating each actuator means to displace each cam in a forward direction.
i) simultaneously activating each actuator means to displace each cam backward thereby locking the portion against the borehole wall; and, ii) sequentially activating each actuator means to displace each cam in a forward direction.
10. The method of claim 8 wherein the pair of cams are simultaneously operated, steps (c) and (d) further comprising:
i) activating one of the actuators to displace one cam in a forward direction;
ii) simultaneously activating the other actuator to pull the other cam backward thereby locking the portion against the borehole wall;
iii) activating the actuator of step (ii) to displace the cam of step (ii) in a forward direction; and iv) simultaneously activating the actuator of step (i) to pull the cam of step (i) backward thereby locking the portion against the borehole wall.
i) activating one of the actuators to displace one cam in a forward direction;
ii) simultaneously activating the other actuator to pull the other cam backward thereby locking the portion against the borehole wall;
iii) activating the actuator of step (ii) to displace the cam of step (ii) in a forward direction; and iv) simultaneously activating the actuator of step (i) to pull the cam of step (i) backward thereby locking the portion against the borehole wall.
11. The method of claim 8, steps (c) and (d) further comprising:
i) urging one cam against the borehole wall;
ii) activating the other actuator to displace the other cam in a forward direction;
iii) activating the actuator of step (ii) to pull the cam of step (ii) backward thereby locking the portion against the borehole wall;
and, iv) repeating steps (ii) - (iii) until the logging tool is conveyed to a predetermined position.
i) urging one cam against the borehole wall;
ii) activating the other actuator to displace the other cam in a forward direction;
iii) activating the actuator of step (ii) to pull the cam of step (ii) backward thereby locking the portion against the borehole wall;
and, iv) repeating steps (ii) - (iii) until the logging tool is conveyed to a predetermined position.
12. The method of claim 11 wherein the cam of step (i) is urged against the borehole wall using a biasing means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/924,672 US5954131A (en) | 1997-09-05 | 1997-09-05 | Method and apparatus for conveying a logging tool through an earth formation |
| US08/924,672 | 1997-09-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2245098A1 CA2245098A1 (en) | 1999-03-05 |
| CA2245098C true CA2245098C (en) | 2002-06-04 |
Family
ID=25450525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002245098A Expired - Lifetime CA2245098C (en) | 1997-09-05 | 1998-08-17 | Method and apparatus for conveying a logging tool through an earth formation |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5954131A (en) |
| EP (1) | EP0900914B1 (en) |
| CN (1) | CN1210934A (en) |
| AU (1) | AU730192B2 (en) |
| CA (1) | CA2245098C (en) |
| CO (1) | CO4840539A1 (en) |
| DE (1) | DE69815609D1 (en) |
| DK (1) | DK0900914T3 (en) |
| EG (1) | EG21500A (en) |
| ID (1) | ID22104A (en) |
| NO (1) | NO318932B1 (en) |
| SA (1) | SA98190471B1 (en) |
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-
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- 1997-09-05 US US08/924,672 patent/US5954131A/en not_active Expired - Lifetime
-
1998
- 1998-08-11 CO CO98045782A patent/CO4840539A1/en unknown
- 1998-08-17 DK DK98202742T patent/DK0900914T3/en active
- 1998-08-17 CA CA002245098A patent/CA2245098C/en not_active Expired - Lifetime
- 1998-08-17 EP EP98202742A patent/EP0900914B1/en not_active Expired - Lifetime
- 1998-08-17 DE DE69815609T patent/DE69815609D1/en not_active Expired - Lifetime
- 1998-08-27 AU AU81889/98A patent/AU730192B2/en not_active Expired
- 1998-08-30 SA SA98190471A patent/SA98190471B1/en unknown
- 1998-09-01 ID IDP981186A patent/ID22104A/en unknown
- 1998-09-03 EG EG105798A patent/EG21500A/en active
- 1998-09-04 CN CN98118896A patent/CN1210934A/en active Pending
- 1998-09-04 NO NO19984087A patent/NO318932B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0900914B1 (en) | 2003-06-18 |
| ID22104A (en) | 1999-09-09 |
| CN1210934A (en) | 1999-03-17 |
| NO318932B1 (en) | 2005-05-23 |
| DE69815609D1 (en) | 2003-07-24 |
| SA98190471B1 (en) | 2006-06-21 |
| AU8188998A (en) | 1999-03-18 |
| CA2245098A1 (en) | 1999-03-05 |
| CO4840539A1 (en) | 1999-09-27 |
| US5954131A (en) | 1999-09-21 |
| AU730192B2 (en) | 2001-03-01 |
| NO984087D0 (en) | 1998-09-04 |
| NO984087L (en) | 1999-03-08 |
| EP0900914A2 (en) | 1999-03-10 |
| EP0900914A3 (en) | 1999-09-01 |
| EG21500A (en) | 2001-11-28 |
| DK0900914T3 (en) | 2003-10-13 |
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| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20180817 |