WO2007011719B1 - Apparent dip angle calculation and image compression based on region of interest - Google Patents

Apparent dip angle calculation and image compression based on region of interest

Info

Publication number
WO2007011719B1
WO2007011719B1 PCT/US2006/027350 US2006027350W WO2007011719B1 WO 2007011719 B1 WO2007011719 B1 WO 2007011719B1 US 2006027350 W US2006027350 W US 2006027350W WO 2007011719 B1 WO2007011719 B1 WO 2007011719B1
Authority
WO
WIPO (PCT)
Prior art keywords
measurements
feature
processor
bha
sensor
Prior art date
Application number
PCT/US2006/027350
Other languages
French (fr)
Other versions
WO2007011719A1 (en
Inventor
Philip L Kurkoski
Gamal A Hassan
Original Assignee
Baker Hughes Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baker Hughes Inc filed Critical Baker Hughes Inc
Priority to GB0800685A priority Critical patent/GB2441936B/en
Priority to BRPI0612992-7A priority patent/BRPI0612992A2/en
Publication of WO2007011719A1 publication Critical patent/WO2007011719A1/en
Publication of WO2007011719B1 publication Critical patent/WO2007011719B1/en
Priority to NO20080428A priority patent/NO20080428L/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
    • G01V11/002—Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant

Abstract

A data compression technique for MWD applications uses feature detection, extraction, followed by image compression for only the region(s) of interest. The detection approach processes data in real time. It triggers on the start and end of a feature without processing any further features. This provides feature detection with zero latency. Compressing only the region of interest provides data compression with both higher resolution and higher compression ratio

Claims

AMENDED CLAIMS received by the International Bureau on 22 January 2007 (22.01.2007)
1 . A method of evaluating an earth formation, the method comprising: (a) conveying a bottomhole assembly (BI-IA) into a borehole in the earth formation; (b) using a formation evaluation sensor on the BMA for making measurements indicative of a property of the earth formation during rotation of the BHA; (c) identifying presence of a feature in the measurements; and (d) transmitting data to a surface location indicative of region of interest including the feature the method cgaracterized by: (e) compressing the data prior to transmission the surface using a hierarchical tree.
2. The method of claim 1 wherein identifying the feature further comprises using a cost function based on a direction of change of the measurements and a change in a value of the measurements.
3. The method of claim 1 wherein the feature is related to a bed boundary in the earth formation
4. The method of claim 1 wherein the transmitted data comprises a dip and a location of a bed boundary.
5. The method of claim 1 further comprising checking for a latency key prior to (d).
6, The method of claim 1 further comprising identifying presence of an additional feature in the measurements within a drill stand prior to (d)
7. The method of claim 1 wherein the compression operation further comprises an operation selected, from (ϊ) a Discrete Cosine Transform, and. (ii) a wavelet- transform
8. The emthod of claim 1 wherein the hierarchical treeis part of a set partitioning in hierarchical trees (SPIHT)
9. The method of claim 1 wherein making the measurements further comprises making at least one of (i) density measurements, (ii) porosity measurements, and (iii) resistivity measurements.
10. The method of claim 1 further comprising reconstructing an, image of the formation.
11. An apparatus for evaluating an earth formation, the apparatus comprising: (a) a bottomhole assembly (BHA) (90) conveyed into a borehole arth an the earth formation, (b) at least one formation evaluation (FE) sensor (64, 76 , 78on the BHA which makes measurements indicative of a properl y of the earth formation during rotation of the BHA; and (c) a processor which: (A) identifies presence of a feature in the measurements; and (B) transmits data to a surface location indicative of a region of interest including the feature; the apparatus characterized by, (d) the processor using a hierarchical tree for compressing the data prior to transmission to the surface.
12. The apparatus of claim 11 wherein the processor identifies the feature by further using a cost function based, on direction of change of the measurements
and a change in a value of the measurements,
13. The apparatus of claim 11 wherein the feature identified by the processor is related to a bed boundary in the earth formation
14. The apparatus of claim 11 wherein the data transmitted by the processor comprises a dip and a location of a bed boundary,
15. The apparatus of claim 11 wherein the processor further checks for a latency key prior to (B).
16. The apparatus of claim 11 wherein the processor further identifies presence of an additional feature in the measurements within a drill stand prior to (B).
17. The apparatus of claim 11 wherein the processor performs the compression operation by further using an operation selected from (i) a Discrete Cosine Transform, and (ϊi) a wavelet transform
18. The apparatus of claim 11 wherein the hierarchical tree is part of a set partitioning in hierarchical trees (SPIHT)
19. The apparatus of claim 11 wherein the FE sensor is selected from (i) a density sensor, (ii) a porosity sensor, and (iii) a resistivity sensor,
20. The apparatus of claim 11 further comprising a drilling tubular which conveys the BHA into the borehole.
21. The apparatus of claim 11 further comprising an orientation sensor which makes measurements during rotation of the BHA, wherein the processor uses the measurements of the orientation sensor for binning the measurements made by the FE sensor.
22. The apparatus of claim 11 further comprising a surface processor which reconstructs an image of the formation using the transmitted data.
23. A computer-readable medium for use with an apparatus for evaluating an earth formation, the apparatus comprising: (a) a bαttornhole assembly (BHA)conveyed into a borehole in the earth. formation; and (b) at least one formation evaluation (FE) sensor on the BHA which makes measurements indicative of a property of the earth formation during rotation of the BHA; the medium comprising instructions which enable a processor to: (c) identify presence of a feature in the measurements and (d) transmit data to a surface location indicative of a region of interest including the feature; the medium characterized by instructions which enable the processor to compress The data prior to transmission by using a hierarchical tree.
24, The medium of claim 23 furtherr comprising at least one of (i) a ROM, (ii) an EPROM. (iii) an EBPROM, (iv) a flash memory, and (v) an optical disk.
PCT/US2006/027350 2005-07-15 2006-07-14 Apparent dip angle calculation and image compression based on region of interest WO2007011719A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0800685A GB2441936B (en) 2005-07-15 2006-07-14 Apparent dip angle calculation and image compression based on region of interest
BRPI0612992-7A BRPI0612992A2 (en) 2005-07-15 2006-07-14 Tilt angle calculation and image compression based on region of interest
NO20080428A NO20080428L (en) 2005-07-15 2008-01-22 Method and apparatus for evaluating a basic formation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69979205P 2005-07-15 2005-07-15
US60/699,792 2005-07-15

Publications (2)

Publication Number Publication Date
WO2007011719A1 WO2007011719A1 (en) 2007-01-25
WO2007011719B1 true WO2007011719B1 (en) 2007-03-15

Family

ID=37188965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/027350 WO2007011719A1 (en) 2005-07-15 2006-07-14 Apparent dip angle calculation and image compression based on region of interest

Country Status (5)

Country Link
US (1) US7424365B2 (en)
BR (1) BRPI0612992A2 (en)
GB (1) GB2441936B (en)
NO (1) NO20080428L (en)
WO (1) WO2007011719A1 (en)

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US8818728B2 (en) * 2007-12-27 2014-08-26 Schlumberger Technology Corporation Method and system for transmitting borehole image data
US8635025B2 (en) * 2007-12-27 2014-01-21 Schlumberger Technology Corporation Method and system for transmitting borehole image data
US8788206B2 (en) * 2008-01-25 2014-07-22 Schlumberger Technology Corporation Data compression transforms for use in downhole applications
US8024121B2 (en) * 2008-01-25 2011-09-20 Smith International, Inc. Data compression method for use in downhole applications
US10302811B2 (en) * 2008-08-21 2019-05-28 Weatherford Technology Holdings, Llc Data reduction of images measured in a borehole
US9062524B2 (en) * 2010-01-27 2015-06-23 Pason Systems Corp. Method and apparatus for correcting data points acquired during well drilling
US8566376B2 (en) 2010-07-30 2013-10-22 Chevron U.S.A. Inc. System and method for data compression using a field programmable gate array
US9377548B2 (en) * 2011-11-09 2016-06-28 Chevron U.S.A. Inc. Wavelet-transform based system and method for analyzing characteristics of a geological formation
US9213117B2 (en) * 2013-01-02 2015-12-15 Schlumberger Technology Corporation Dip seismic attributes
US10401529B2 (en) * 2014-10-17 2019-09-03 Halliburton Energy Services, Inc. Fast-changing dip formation resistivity estimation
US10578758B2 (en) 2015-03-19 2020-03-03 Exxonmobil Upstream Research Company Sequence pattern characterization
CA2988401C (en) 2015-07-28 2020-04-28 Halliburton Energy Services, Inc. Sensor data compression for downhole telemetry applications
US10743012B2 (en) * 2016-12-15 2020-08-11 Schlumberger Technology Corporation Feature compensated borehole image coding
GB2604438B (en) * 2019-06-12 2023-05-24 Baker Hughes Oilfield Operations Llc Compressing data collected downhole in a wellbore

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Also Published As

Publication number Publication date
NO20080428L (en) 2008-04-14
US20070027629A1 (en) 2007-02-01
GB0800685D0 (en) 2008-02-20
GB2441936B (en) 2010-06-16
GB2441936A (en) 2008-03-19
BRPI0612992A2 (en) 2010-12-14
US7424365B2 (en) 2008-09-09
WO2007011719A1 (en) 2007-01-25

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