CN102242626A - Steam drive exploitation method for heavy oil reservoir - Google Patents
Steam drive exploitation method for heavy oil reservoir Download PDFInfo
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Abstract
The invention belongs to the field of oil exploitation, and relates to a steam drive exploitation method for a heavy oil reservoir, in particular to a steam drive exploitation method of intermediate-deep layer heavy oil aided by injecting air. The method comprises the following steps of synchronously and continuously injecting steam and air in a steam injection well according to a certain mass ratio in the process of intermediate-deep layer heavy oil steam drive production, and performing a low-temperature oxidation reaction between crude oil and oxygen. According to the method disclosed by the invention, heat utilization and recovery ratio of intermediate-deep layer heavy oil steam drive can be improved; a problem of steam channeling among injection and exploitation wells can be eased, and development effect of steam drive can be improved.
Description
Technical field
The invention belongs to field of petroleum exploitation, relate to the steam flooding exploitation method of heavy crude reservoir, particularly mid-deep strata thick oil filling air assisted steam flooding exploitation method.
Background technology
Viscous crude is important petroleum resources of 21 century, and the reserves of world's viscous crude, super viscous crude and natural asphalt are about 1000 * 10
8Ton accounts for 53% of world oil residual recoverable reserves, mainly is distributed in countries and regions such as Canada, Venezuela, the U.S., China.Viscous crude accounts for 40% in the China's oil residual recoverable reserves, and mid-deep strata viscous crude wherein accounts for 70%.
The mode of thickened oil recovery mainly is to take measures to improve crude oil fluidity, raising profit mobility ratio increase mother oil displacement efficient.At present, thickened oil recovery mainly comprises steam soak, steam flooding and combustion in situ mainly based on oil recovery by heating.
Combustion in situ is air to be annotated high-temperature oxydation reaction generation heat takes place to reduce viscosity of crude in the oil reservoir, because the implementing process complexity need and be kept high gas injection rate at the ground down-firing, underground combustion is wayward, and on-the-spot success rate is not high.
The steam soak exploitation is periodically to inject a certain amount of wet saturated steam in oil well, and stewing well is after a period of time, with the manufacturing process of back production behind the heating crude oil viscosity reduction in the oil reservoir certain limit.Steam soak is a kind of development scheme that consumes stratum energy, and recovery ratio is low, is generally 5%～36.5%.
Steam flooding is a kind of effective substituted technique of steam soak, and steam flooding is according to certain flooding pattern, injects wet saturated steam continuously with the oil recovery by heating mode of mother oil displacement to producing well from annotating the vapour well.Steam flooding is compared with steam soak and can be improved recovery ratio more than 20%, but the later stage under development easily exists vapour to scurry and heat utilization efficiency is hanged down problem, influences development effectiveness.The shallow layer thick oil oil reservoir relies on the steam drive development recovery ratio can reach 55%～60%, and the mid-deep strata thick oil steam drive is demanded urgently breaking through as a world-class difficult problem, and aspect technology, the exploitation of mid-deep strata thick oil steam drive is crucial need to break through two hang-ups:
The one, bury deeply, steam is along the big problem of journey heat waste.For mid-deep strata oil reservoir (500-1400m), under technology art condition in the past, the shaft bottom mass dryness fraction is difficult to meet the demands.
The theoretical calculating with actual measurement of wellbore heat loss shows: annotate under the vapour condition at blank tubing, become hot water below the 800m degree of depth; Under steam soak heat-insulating technique condition, the following steam quality of the 800m degree of depth reduces to 30～35%, and traditional pit shaft heat-insulating technique can not satisfy the needs of mid-deep strata steam flooding to steam quality.
The 2nd, steam injection pressure height under the mid-deep strata condition, the problem that the steam thermal energy utilization rate is low.Theoretical calculating shows that mid-deep strata oil reservoir steam consumption is 4 times of shallow-layer, and oil reservoir can utilize steam heat only to be 50% of shallow-layer.
CN101004132 provides a kind of method for production of heavy oil reservoir.Its technical essential is to inject air to improve recovery ratio and project benefit in the process of steam soak.This method comprises following processing step: heavy oil tested layer carries out the sleeve pipe sand control completion after the drilling well, to suppress shaking out of later stage exploitation; Build up the artificial bottom of a well in the completion process, the high pressure when bearing steam injection and pressure-air; Completion is injected vapours (more than 200 ℃), increases reservoir temperature, reduces viscosity of thickened oil; After treating that reservoir temperature raises, air can be injected same oil reservoir, closing well makes crude oil and oxygen produce oxidation reaction then; Treat the stable back of well head pressure opening well and making production.The mechanism and the advantage of this technology are that the reaction of oxygen and crude oil generation low-temperature oxidation is emitted heat and produced carbon dioxide and the gaseous mixture of nitrogen in the air, increases displacement of reservoir oil energy; Oxidation reaction cleavable viscous crude changes oil component, increases crude oil fluidity and oil quality; Airborne oxygen can most of oxidized reaction consumes fall, and does not produce the potential safety hazard that oil well oxygen causes; Air resource is abundant, can reduce financial cost.
CN101539012 provides a kind of stratum catalytic oxidation thick oil thermal recovery method.This method is in thickened oil steam-stimulated or steam flooding process, inject a kind of catalyzer with catalytic oxidation and cracking function, and be aided with air in certain amount and inject, catalytic oxidation and cracking reaction take place in the stratum during stewing well or steam drive, make crude oil lighting viscosity reduction, generate simultaneously and can improve the surfactant of crude oil fluidity, thereby reach the purpose that improves the thickened oil recovery effect.Multiple mode that this method integrates thickened oil steam-stimulated or steam flooding, the flue gas displacement of reservoir oil, surfactant flooding and thin oil dilution method are recovered the oil, it is a kind of composite highly effective oil recovery technique, viscous crude produces flue gas on the spot in oil reservoir under catalysed oxidn, cracking lighting on the spot, reduce viscosity, produce surfactant on the spot, reduce oil water interfacial tension.
But, though CN101004132 and CN101539012 have also mentioned disclosed method and have been suitable for the process of steam flooding, but it has only described cyclic steam stimulation technology, and does not solve the steam drive development middle and later periods, particularly injects the problem that vapour is scurried between injection-production well under the situation of air at the same time.
In addition, the method that CN101004132 and CN101539012 describe is because of being cyclic steam stimulation process, be in stewing well a period of time, make the airborne oxygen and the crude oil of injection produce abundant oxidation reaction, after treating that well head pressure is stable, opening well and making production, so the injection rate of oxygen is not required (seeing the 4th section of CN101004132 Instructions Page 2), can there be the problem of the potential safety hazard of oil gas and oxygen mixed gas ignition.Therefore, the document does not have explanation to drive the problem that air how to control injection in the oil recovery process avoids producing the potential safety hazard that oil gas and oxygen mixed gas ignite at vapour.
In existing technology, also exist the problem that oil reservoir steam inside heat waste is big, heat utilization efficiency is low.For ensureing the steam drive development effect, must strengthen steam at the scene in the implementation process and inject intensity, increase the steam injection rate, can cause the significant wastage of the energy so on the one hand; Annotate on the other hand vapour intensity cross conference make vapour drive between exploitation middle and later periods injection-production well vapour to scurry phenomenon serious, cause the steam swept volume low, vapour drives rate of oil production and sharply descends.
Summary of the invention
In view of above reason, the present invention proposes a kind of economically viable, method that can improve the viscous crude heating exploitation effectively, and the principal character of this method is in the steam flooding activities, injects air and comes the auxiliary steam displacement of reservoir oil by the low-temperature oxidation reagentia.
The present invention realizes that by following thickened oil recovery method this method may further comprise the steps:
(1) annotates vapour well and producing well and all adopt the prestressed casing completion mode;
(2) in annotating the vapour well, be lowered to heat insulation steam injection string;
(3) continuous steam in jection in annotating the vapour well is to guarantee arriving the steam quality in shaft bottom more than 50%;
(4) inject air continuously in annotating the vapour well, air and steam are taked injection mode simultaneously, and the air that injects is 1 with the quality of steam ratio: 8-15.
Surprisingly, by said method of the present invention, not only improved mid-deep strata thick oil steam drive efficiency of utilization and recovery ratio, the vapour that has also slowed down between injection-production well is scurried.Simultaneously, the air that injects by control and the mass ratio of steam are 1: in the scope of 8-15, avoided producing in the manufacturing process security hidden trouble of oil gas and oxygen mixed gas ignition.
Therefore, method of the present invention has following technical advantage:
(1) air resource is abundant, and cost of investment is low;
(2) low-temperature oxidation reaction cleavable viscous crude changes oil component, increases crude oil fluidity and oil quality;
(3) contain carbon dioxide in the product, can reduce viscosity of crude, improve displacement of reservoir oil seepage flow condition;
(4) airborne nitrogen is subjected to the gravity difference effect, can float to the top of oil horizon, because nitrogen is good heat insulation medium, can effectively reduce oil reservoir steam inside heat waste, improves the steam heat utilization ratio;
(5) there are differences in viscosity in nitrogen and steam, can weaken the steam fingering in oil reservoir, improve the steam swept volume, slow down vapour and scurry;
(6) the oxidized reaction consumes of airborne oxygen is fallen, and does not produce the potential safety hazard that oil well oxygen causes.
Description of drawings
Fig. 1 shows air injection assisted steam flooding production technique process principle figure, and number designation wherein is expressed as follows:
1, heavy oil tested layer 2, notes vapour well 3, long-acting heat insulation steam injection string 4, producing well 5, high-pressure gas injection pipeline 6, air compressor 7, high pressure steam injection pipeline 8, wet steam generator 9, ball-and-seat
The specific embodiment
The steam flooding exploitation method of heavy crude reservoir of the present invention may further comprise the steps:
(1) annotate vapour well and producing well and all adopt the prestressed casing completion mode, cement returns high to ground;
(2) in annotating the vapour well, be lowered to heat insulation steam injection string;
(3) continuous steam in jection in annotating the vapour well is to guarantee arriving the steam quality in shaft bottom more than 50%;
(4) adopt air compressor to inject air continuously in annotating the vapour well, air and steam are taked injection mode simultaneously.
(5) when in annotating the vapour well, injecting air and steam continuously, producing well exploitation in the well group.
In said method of the present invention, adopt anti-nine point modes to dispose the steam flooding flooding pattern, used heat insulation steam injection string is long-acting heat insulation steam injection string, drives packer, Y441-152 by E level instlated tubular, QK331-152 high-temperature and long-efficiency vapour and forces deblocking vapour to drive packer, JM-100 instlated tubular box cupling sealer, heat insulation type telescoping tube to form.
In the method for the invention, before injecting air, vapour well injection catalytic oxidation composite catalyst can annotated.Described catalytic oxidation composite catalyst is the catalyzer that promotes airborne oxygen and crude oil generation oxidation reaction and mink cell focus component generation cracking reaction.As concrete example, what use in the inventive method is B phase oxidation composite catalyst.Before injecting air according to the amount injecting catalyst that injects air quality 1.5% to 2%.
In said method of the present invention, described steam is the high mass dryness fraction saturated vapour of well head mass dryness fraction 〉=75%, and vapor (steam) temperature is more than 260 ℃.The air that injects in annotating the vapour well is 1 with the quality of steam ratio: 8-15, preferred 1: 9-12, most preferably 1: 10.If the air capacity of injecting is very few, then can't plays the vapour that improves recovery ratio, slows down between injection-production well and scurry effect; If air capacity is too much, remaining oxygen is mixed with oil gas produce the potential safety hazard of igniting.Can determine according to different geological conditions and well group crude oil reserve with the injection total amount of steam for injecting air.
For example, in the present invention, the first mouthful air injection assisted steam flooding well group of neat 40-17-028 for implementing, be assurance site operation safety in the implementation process early stage, air and steam injection ratio are 1: 15, injecting after three months well group output only has trace to promote, average day produce oil 60.8t of well group when steam in jection (only be 60.5t); Air and steam ratio are adjusted into 1: 12, and well group output has obvious lifting, average day produce oil 65.7t of well group; Air and steam ratio are adjusted into 1: 10, and well group output significantly promotes, average day produce oil 72.3t of well group, the highest day produce oil 102.8t; But for guaranteeing site operation safety, avoid the potential safety hazard that remaining oxygen is mixed with oil gas produce to ignite, the height of air and quality of steam ratio is defined as 1: 8 because of air capacity.
In addition, for preventing opposing steam flow, can adopt double-gate to control and install ball-and-seat at notes vapour well head to air compressor.
In a specific embodiment of the present invention, the steam flooding exploitation method of heavy crude reservoir of the present invention is the exploitation method of air injection assisted steam flooding, comprises following processing step:
(1) adopt anti-nine point modes to dispose the steam flooding flooding pattern, annotate vapour well and producing well and all adopt the prestressed casing completion mode, cement returns high to ground, to adapt to the production characteristics of steam flooding high temperature, high pressure;
(2) in annotating the vapour well, be lowered to the long-acting heat insulation steam injection string of forming by instlated tubular, heating power packer, telescoping tube, to reduce the steam in jection heat waste;
(3) in annotating the vapour well, inject continuously well head mass dryness fraction 〉=75%, temperature is at the high mass dryness fraction saturated vapour more than 260 ℃, to guarantee that the shaft bottom steam quality is more than 50%;
(4) before injecting air, inject the catalytic oxidation composite catalyst according to the amount of injecting air quality 2%, to quicken the oxidation reaction speed of oxygen and crude oil;
(5) adopt W-7/400 or W-10/150 type air compressor to inject air in continuous 24 hours in annotating the vapour well, air and steam are all taked injection mode simultaneously, and air is 1: 10 with the quality of steam ratio.
(6) when in annotating the vapour well, injecting air and steam continuously, the producing well exploitation.
Breadboard experiment shows that crude oil and the airborne oxygen of injection after temperature surpasses 100 ℃ spontaneous low-temperature oxidation reaction can take place.
Method of the present invention is suitable for the middle and later periods use of steam drive development.By steam in jection in the mid-deep strata heavy crude reservoir, energy is provided and heats oil reservoir, thereby form steam flooding.In the steam drive development middle and later periods, down-hole formation temperature field fully forms, formation temperature reaches more than 200 ℃, the viscous crude that is heated by steam can carry out spontaneous low-temperature oxidation reaction with the airborne oxygen that injects in oil reservoir, this low-temperature oxidation reaction cleavable viscous crude changes oil component, increases crude oil fluidity and oil quality.In addition, the thick oil branching chain is the oxygenatedchemicals (aldehyde, ketone, alcohol and carboxylic acid) of polarity by dioxygen oxidation, also can become spontaneous surfactant, can improve oil displacement efficiency.
And unexpected additional effect is, injects airborne nitrogen and is subjected to gravity difference effect come-up to the top of oil horizon, because nitrogen is good heat insulation medium, can effectively reduce the heat waste of steam in oil reservoir inside, has improved the steam heat utilization ratio greatly.Concurrently injected air can also prevent that steam from because of the onlap that action of gravity causes, playing the profile control effect.Because there are differences in viscosity in airborne nitrogen and steam, can weaken the steam fingering in oil reservoir, slow down vapour effectively and scurry, improve the steam swept volume.In addition, airborne nitrogen is compressed expansion can change the crude oil flow form, the increase crude oil fluidity, and airborne oxygen is owing to being consumed in the low-temperature oxidation reaction, so avoided can producing in the manufacturing process security hidden trouble of oil gas and oxygen mixed gas ignition.
In the method for the present invention, can before steam in jection, inject the catalytic oxidation composite catalyst,, make oxygen before arriving producing well so can increase the OUR of oxidation reaction, just by full consumption, and the security hidden trouble that oil gas and oxygen mixed gas are ignited can not take place.Even if do not inject the catalytic oxidation composite catalyst, the water in the stratum and the existence of clay mineral also can increase the activity of crude oil oxidation and cracking reaction.The preferred B phase composite oxide catalyst that uses in the method for the present invention.
In the method for the present invention, in steam in jection, inject air, the mixed water injection pressure for vaporization is reduced, reduce heat waste, keep vapor (steam) temperature and mass dryness fraction, strengthen the distillation of light components in the crude oil, improve oil displacement efficiency; And the associated gas in the oil well, main component is nitrogen and carbon dioxide, can be recycled into to reuse in the oil reservoir, has reduced environment pollution.
Deep-layer heavy crude air injection assisted steam flooding exploitation method described in the invention except that above-mentioned increasing yield is arranged, because the air source is unrestricted, is compared with other sources of the gas, has with low cost, obvious results advantage, can reduce the financial cost of engineering greatly.
In order more easily to understand the present invention, below by the mode of specific embodiment the present invention is described, but the present invention and be limited to this embodiment not to the utmost.
Embodiment
As shown in Figure 1, in heavy oil tested layer 1, annotate between vapour well 2 and the producing well 4 and dispose the steam flooding flooding pattern, annotate vapour well and producing well and all adopt prestressing force mode completion according to anti-nine point modes.
In annotating the vapour well, be lowered to long-acting heat insulation steam injection string 3, reduce the steam heat loss, improve the shaft bottom mass dryness fraction.Used long-acting heat insulation steam injection string 3 drives packer, Y441-152 by E level instlated tubular, QK331-152 high-temperature and long-efficiency vapour forces deblocking vapour to drive the long-acting heat insulation steam injection string that packer, JM-100 instlated tubular box cupling sealer and heat insulation type telescoping tube are formed.
Wherein, E level instlated tubular is a vacuum heat insulation tube, adopts prestressing force vacuum heat-insulation double-decker, and oval threaded connection mode has good sealing and anti-stick button performance; Added the high-temperature alloy element in the tubing chemical composition, apparent heat conductivity reaches E level (0.006＞λ 〉=0.002), thereby has improved the heat-proof quality of instlated tubular greatly.
QK331-152 high-temperature and long-efficiency vapour drives packer and is made up of four parts such as central tube, multiple expansion chamber, liquid expander, support spacer rings.Structurally adopt the sealing of multi-cavity body soft metal, support spacer ring and under high temperature and squeezing action, be out of shape, compensate the deficiency of multiple expansion chamber at any time the sealing of oil jacket annular space, thus the sealing effectiveness and the application life of improving multistage long-term seal device.
Y441-152 force deblocking steam flooding packer by sealing mechanism, surging sets locking device, anchor mechanism, deblocking and compensation mechanism and forms.Adopt waterpower seat envelope, the bi-directional slip grappling, on put forward the deblocking mode.Adopt unique seal designs, heatproof is long-acting and can realize the elastic packing compensation.
JM-100 instlated tubular box cupling sealer is made up of inner sliding sleeve, heat-insulating and sealing joint, is installed on instlated tubular box cupling position during lower tubular column.In the tubing string connection procedure, cavity two ends and instlated tubular end compress, and make to form between box cupling and the internal portioning layer to have the closed heat insulation layer that better heat-proof quality material is filled, and play the effect of eliminating instlated tubular box cupling place heat waste.
The heat insulation type telescoping tube is made up of five parts such as pipe, heat insulation type outer tube, sealing, compensation mechanism, apparatus for eliminating sludge in the thermal-insulating type.In steam injection process, temperature influence, telescoping tube outer tube produce relatively along interior pipe and slide, and apparatus for eliminating sludge is removed dirty matter and other impurity of outer wall of inner tube in sliding process, reduce the loss to seal.Introduce high steam simultaneously as motive power, seal is produced thrust, guarantee the movable sealing effect of telescoping tube by effect compensation body.
Ground steam injection system is made up of wet steam generator 8 and steam injection pipeline 7.The air injection system is made up of air compressor 6 and high-pressure gas injection pipeline 5.Steam and air inject oil reservoir simultaneously by annotating the vapour well head.For guaranteeing production safety, prevent that residual oxygen surpasses the ignition limiting value in the oil well, the oxygen composition in the reply oil well output gas is monitored.
Inject well head mass dryness fraction 〉=75% in annotating the vapour well continuously, the high mass dryness fraction saturated vapour of temperature more than 260 ℃ is to guarantee that the shaft bottom steam quality is more than 50%.
Before injecting air,, inject AB phase catalytic oxidation composite catalyst (the Liaohe Oil Field oily industrial corporation of China produces, and is mixed with the aqueous solution of weight concentration 30%), to quicken the oxidation reaction speed of oxygen and crude oil according to the catalytic amount that injects air quality 2.0%.
Adopt W-7/400 or W-10/150 type air compressor to inject air continuously in annotating the vapour well in 24 hours, air and steam are taked injection mode simultaneously, and air is 1: 10 with the quality of steam ratio.
Producing well is produced in steam in jection and air.
The present invention is in mid-deep strata thick oil steam drive activities, come the auxiliary steam displacement of reservoir oil by injecting the reagentia of air generation low-temperature oxidation, can effectively slow down vapour and scurry problem, can improve recovery ratio more than 10% with steam flooding method (only steam in jection) contrast of implementing before the inventive method.
Method of the present invention was implemented 12 months at three well groups of neat 40 steam floodings, related to 3 mouthfuls and annotated vapour well, 24 mouthfuls of producing wells, accumulative total is injected air 1,920,000 sides, increases oily 5434.2t, and average individual well group increases day by day more than the oily 10t, the highest oily 44.2t that increases day by day has obtained obvious effects.
Following table 1 has been listed and has been taked the inventive method front and back statistical effect:
Table 1
In the last table, before using method of the present invention,, there is high temperature vapour to scurry problem between injection-production well, so 9 mouthfuls of whole opening well and making production of well can't be had to close 1-2 mouth well owing to only inject high-temperature vapour.After using method of the present invention, having solved to adopt has high temperature vapour to scurry problem between well, improved tar productivity.
About selection of catalysts among the present invention
1. the performance of catalyzer
The catalyzer that in experimental rig, adds 50g crude oil, 50ml water and different component, treat that temperature is warmed up to 200 ℃ in the device, isothermal reaction is 12 hours behind the air pressurising 0.6MPa, investigate oil product and form variation, viscosity variation, acid number variation and CO2 growing amount situation of change, experimental result sees Table 2.
Table 2. catalyst performance evaluation table
In the table 2, from viscosity of crude and CO2 growing amount, the viscosity reduction degree of CB, DB, AB is bigger, illustrates because the catalysed oxidn of B phase catalyst, the CO of feasible generation on the one hand
2Play swelling action and reduce viscosity of thickened oil with the gaseous state lighter hydrocarbons; The gum asphalt component obtains catalytic pyrolysis in the viscous crude on the other hand, has reduced molecular weight, thereby has reduced viscosity of crude.
Changed by acid number, it is bigger that the B phase catalyst increases contribution to the viscous crude acid number, shows that the B phase catalyst plays a major role to catalytic oxidation, generated a large amount of surfactant (aldehyde, ketone, alcohol and carboxylic acid etc.), and this also plays a role to reducing viscosity of thickened oil.
CO2 by viscosity, acid number and generation measures, and the catalytic oxidation effect of CB, DB, AB all is better than AE, AF.
In the table 2, add CB, behind DB and the AB, Δ P is negative, is pressure reduction reason of changes before and after the analytical reactions system, and experiment is carried out component analysis to reacted tail gas.
The initial pressurising of reaction system because CO2 content is lower in the air, can be ignored in the air of 0.6MPa.N2 is dissolved in viscous crude and hardly for ease of calculating under the normal temperature low pressure, and experiment is thought and do not dissolved N2 in the catalytic oxidation rear oxidation oil.The composition of analyzing tail gas of the CO2 that pressure by the reaction system front and back changes, acid number changes and generate.
Table 3 catalyzer-tail gas relation table
As shown in Table 3, crude oil has generated CO2 and gaseous state lighter hydrocarbons by catalytic oxidation.Catalytic oxidation gained tail gas component situation by CB, DB, AE, AF, five kinds of catalyzer of AB, CO2 content in the product tail gas is few, show the most of and viscous crude low-temperature catalytic oxidation of oxygen and make hydro carbons and gum asphalt generation carboxylation in the viscous crude, thereby make the acid number of oxygenated oil increase, be the oxygen uptake reaction but not combustion reaction.By the content of gaseous hydrocarbon in the tail gas also as can be seen, the B phase catalyst plays a major role to the catalytic oxidation of viscous crude.Therefore, composite catalyst based on the B laboratory test that experimentizes is selected in experiment for use.
2. catalyst consumption
The AB composite oxide catalyst that in experimental rig, adds 50g crude oil, 50ml water and variable concentrations, treat that temperature is warmed up to 200 ℃ in the device, isothermal reaction is 12 hours behind the air pressurising 0.5MPa, investigate catalyst consumption and oil product and form variation, viscosity variation, acid number situation of change, experimental result sees Table 4.
Table 4. catalyst amount-pressure reduction, μ, X relation
Experiment condition: W
Oil=50g, V
Water=50ml, reaction temperature T=200 ℃, initial pressure P
0=0.6MPa, rotational speed N=600 commentaries on classics/min, reaction time t=12h.
From reaction pressure reduction situation of change, pressure reduction differs less before and after the system, but wherein catalyst amount is that 0.2% o'clock pressure reduction of feedstock oil quality is bigger, and this is that cracking generates a large amount of lighter hydrocarbons and caused to viscous crude by catalyzer;
From the viscosity situation of change, viscosity of crude changes on a declining curve with the catalyst amount increase substantially, increases sharply but catalyst amount is 0.6% o'clock viscosity, and this is because of the increase along with catalyst amount, and sour polymerisation more seriously causes;
From the acid number situation of change, the oxygenated oil acid number was bigger when catalyst amount was the 0.2%W of feedstock oil quality, showed that the catalytic oxidation effect of this moment is better.
Take all factors into consideration above situation, catalyst amount is 0.2% o'clock of feedstock oil quality, good catalytic activity, and this moment, air was 1: 10 with the crude quality ratio, therefore, the amount of catalyzer is 2.0% of an air quality.
To sum up analyze, preferred based on B composite oxide catalyst mutually in the inventive method, the use amount of preferred catalyst is for injecting 2.0% of air quality.
Claims (9)
1. the steam flooding exploitation method of a heavy crude reservoir, this method may further comprise the steps:
(1) disposes the steam flooding flooding pattern, annotate vapour well and producing well and all adopt the prestressed casing completion mode;
(2) in annotating the vapour well, be lowered to heat insulation steam injection string;
(3) continuous steam in jection in annotating the vapour well makes the steam quality that arrives the shaft bottom more than 50%;
(4) inject air continuously in annotating the vapour well, air and steam are taked concurrently injected mode, and the mass ratio of the air of injection and steam at 1: 8 between 15.
2. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1, wherein, described heat insulation steam injection string drives packer, Y441-152 by E level instlated tubular, QK331-152 high-temperature and long-efficiency vapour and forces deblocking vapour to drive packer, JM-100 instlated tubular box cupling sealer and heat insulation type telescoping tube to form.
3. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1, wherein, described steam is the high mass dryness fraction saturated vapour of well head mass dryness fraction 〉=75%, vapor (steam) temperature is more than 260 ℃.
4. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1 wherein, is being annotated vapour well injection catalytic oxidation composite catalyst before injecting air.
5. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 4, wherein, described catalytic oxidation composite catalyst is the B phase catalyst that promotes airborne oxygen and crude oil generation oxidation reaction and mink cell focus component generation cracking reaction.
6. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1, wherein, the air that injects in annotating the vapour well and the mass ratio of steam are 1: 9-12.
7. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1 wherein, adopts anti-nine point modes to dispose the steam flooding flooding pattern.
8. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 4 wherein, injects based on B catalytic oxidation composite catalyst mutually according to 1.5% to 2.0% the amount of injecting air quality before injecting air.
9. the steam flooding exploitation method of heavy crude reservoir as claimed in claim 1 wherein, adopts double-gate to control and install ball-and-seat at notes vapour well head, to prevent that opposing steam flow is to air compressor.
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| CN104033138A (en) * | 2014-06-04 | 2014-09-10 | 中国石油大学(华东) | Device and method for integrating functions of steam injection fluctuation and chemical blocking removal of heavy oil reservoir without removing tubular columns |
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| CN107100599B (en) * | 2017-03-17 | 2019-10-11 | 中国石油天然气股份有限公司 | Oil production method and its well pattern arragement construction |
| CN107893647A (en) * | 2017-11-23 | 2018-04-10 | 中国石油天然气股份有限公司 | A kind of method and system of air foam assisted steam flooding production of heavy oil reservoir |
| WO2021057760A1 (en) * | 2019-09-24 | 2021-04-01 | 中国石油天然气股份有限公司 | Method, device, and system for low-frequency variable-pressure oil reservoir exploitation of remaining oil in pores |
| CN114876429A (en) * | 2022-05-24 | 2022-08-09 | 中国海洋石油集团有限公司 | Method for exploiting heavy oil reservoir by utilizing catalytic thermogenesis of wellbore |
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