CN101403294B - Stratum pressure detection method for interchange of PDC drilling bit and roller bit - Google Patents
Stratum pressure detection method for interchange of PDC drilling bit and roller bit Download PDFInfo
- Publication number
- CN101403294B CN101403294B CN2008101587436A CN200810158743A CN101403294B CN 101403294 B CN101403294 B CN 101403294B CN 2008101587436 A CN2008101587436 A CN 2008101587436A CN 200810158743 A CN200810158743 A CN 200810158743A CN 101403294 B CN101403294 B CN 101403294B
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- well
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- well depth
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Abstract
The invention relates to a formation pressure testing method used in on-site oil-field geological exploration well logging when a PDC drill bit and a roller bit are exchanged. The technical proposal is as follows: when the roller bit is mainly taken in a well drilling section, the dc indexes of the PDC drill bit are converted into the dc indexes of the roller bit; and when the PDC drill bit is mainly taken in a well drilling section, the indexes of the roller bit are converted into the dc indexes of the PDC drill bit. The testing method comprises the following steps: 1, determining an initial well depth at a well section to be corrected, namely h1 and h2; 2, determining the average value of the dc indexes in a certain distance back and forth of the well depth h1, and the difference of the two being d1; 3, determining the average value of the dc indexes in a certain distance back and forth of the well depth h2, and the difference of the two being d2; and 4, substituting the h1, the h2, the d1, and the d2 into a formula to calculate out a dc index corrected value of corresponding well depth in the corrected well section. The method has the beneficial effect that when the PDC drill bit is used, the effect which is the same with the conventional dc index testing method can be achieved.
Description
One, technical field:
Formation pressure detection method when the present invention relates to the on-the-spot PDC drill bit that uses of well logging in a kind of oil field geologic exploration engineering with the rock bit exchange.
Two, background technology:
Traditional all is based upon on the rock bit basis with boring formation pressure detection method; And at present; Because the PDC drill bit is widely used in the drilling engineering construction; And often exchange with rock bit and use, so traditional detection method can't satisfy present wellbore construction, must adopt new detection method or improves original method and could accomplish with the brill formation pressure detection.
Three, summary of the invention:
The object of the invention is exactly the above-mentioned defective that exists to prior art; Formation pressure detection method when providing a kind of PDC drill bit and rock bit to exchange; Adopt a kind of simple method with the dc index mutual correction under PDC drill bit and the rock bit condition, thereby reach the purpose that detects strata pressure with boring.
Its technical scheme is: when being main with rock bit, PDC drill bit dc index is converted into rock bit dc index in the drilling well section, updating formula is:
D school=dcs+ [h* (d
2-d
1)+h
2* d
1-h
1* d
2]/(h
2-h
1)
When being main with the PDC drill bit with the drilling well section, the dc index when rock bit is converted into the PDC drill bit, updating formula is:
D school=dcs-[h* (d
2-d
1)+h
2* d
1-h
1* d
2]/(h
2-h
1)
In the formula: the dc index of D school-correction; The dc index that dcs-calculates in real time; The well depth of h-conversion point; h
1The initial well depth of-conversion well section; h
2-conversion well section finishes well depth; d
1, d
2-meter constant, the dc index difference before and after well depth h1, the h2 place bit change;
Its detection method may further comprise the steps:
Step 1: confirm to need to proofread and correct the initial well depth of well section, i.e. h
1, h
2
Step 2: confirm well depth h respectively
1The average and the well depth h of dc exponential quantity in the preceding certain distance
1The average of dc exponential quantity in the back certain distance, both differences are d
1
Step 3: confirm well depth h respectively
2The average and the well depth h of dc exponential quantity in the preceding certain distance
2The average of dc exponential quantity in the back certain distance, both differences are d
2
Step 4: with h
1, h
2, d
1, d
2The substitution formula is obtained the dc index corrected value of proofreading and correct corresponding well depth in the well section.
Above-mentioned certain distance adopts 30 meters, and based on the actual conditions adjustment, the dc exponential quantity should be relatively stable in the well section.
The invention has the beneficial effects as follows: the present invention can accomplish with boring formation pressure detection; It is a kind of simple method; With the dc index mutual correction under PDC drill bit and the rock bit condition; Thereby reach the purpose that detects strata pressure with boring, when using the PDC drill bit, can reach and traditional same effect of dc index detection method.
Four, description of drawings:
Accompanying drawing 1 is d of the present invention
1, d
2Value signal;
Accompanying drawing 2 is that the present invention is with the approximate a kind of embodiment that asks for the dc exponential average of drawing;
Accompanying drawing 3 is that the present invention is with the approximate another kind of embodiment that asks for the dc exponential average of drawing;
Accompanying drawing 4 is the present invention asks for the dc index corrected value of corresponding well depth with the Excel table sketch mapes.
Five, the specific embodiment:
Embodiment 1: combine accompanying drawing 1-4, the present invention is done further description:
1, confirms h
1, h
2:
It is 2140～2472m that rock bit is used the well section, and all the other well sections are used the PDC drill bit, get and decide h
1Be 2140m, h
2Be 2472m.
2, confirm d
1, d
2:
With reference to dc exponential average before the accompanying drawing 2:2140m is 0.7076, and the dc exponential average is 1.2241 after the 2140m, d
1=1.2241-0.7076=0.52
With reference to dc exponential average before the accompanying drawing 3:2472m is 1.3232, and the dc exponential average is 1.0048 after the 2472m, d
2=1.3232-1.0048=0.28
3, confirm d school (, replacing the d school at this with DCP) to show difference owing to be rock bit to be proofreaied and correct be the PDC drill bit
Ask for the dc index corrected value of corresponding well depth with Excel table, with reference to accompanying drawing 4:
With h
1, h
2, d
1, d
2The substitution formula is obtained the dc index corrected value (this example uses the Excel table to calculate) of proofreading and correct corresponding well depth in the well section.
Claims (2)
1. the formation pressure detection method when PDC drill bit and rock bit are exchanged is characterized in that:
When being main with rock bit, PDC drill bit dc index is converted into rock bit dc index in the drilling well section, updating formula is:
D school=dcs+ [h* (d
2-d
1)+h
2* d
1-h
1* d
2]/(h
2-h
1)
In the drilling well section when being main with the PDC drill bit, the dc index when rock bit is converted into the PDC drill bit, updating formula is:
D school=dcs-[h* (d
2-d
1)+h
2* d
1-h
1* d
2]/(h
2-h
1)
In the formula: the dc index of D school-correction; The dc index that dcs-calculates in real time; The well depth of h-conversion point; h
1The initial well depth of-conversion well section; h
2-conversion well section finishes well depth; d
1, d
2-meter constant, the dc index difference before and after well depth h1, the h2 place bit change;
Its detection method may further comprise the steps:
Step 1: confirm to need to proofread and correct the initial well depth of well section, i.e. h
1, h
2
Step 2: confirm well depth h respectively
1The average and the well depth h of dc exponential quantity in the preceding certain distance
1The average of dc exponential quantity in the back certain distance, both differences are d
1
Step 3: confirm well depth h respectively
2The average and the well depth h of dc exponential quantity in the preceding certain distance
2The average of dc exponential quantity in the back certain distance, both differences are d
2
Step 4: with h
1, h
2, d
1, d
2The substitution formula is obtained the dc index corrected value of proofreading and correct corresponding well depth in the well section.
2. the formation pressure detection method when PDC drill bit according to claim 1 and rock bit are exchanged is characterized in that: described certain distance adopts 30 meters, and according to the actual conditions adjustment, the dc exponential quantity should be relatively stable in the well section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101587436A CN101403294B (en) | 2008-11-06 | 2008-11-06 | Stratum pressure detection method for interchange of PDC drilling bit and roller bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101587436A CN101403294B (en) | 2008-11-06 | 2008-11-06 | Stratum pressure detection method for interchange of PDC drilling bit and roller bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101403294A CN101403294A (en) | 2009-04-08 |
| CN101403294B true CN101403294B (en) | 2012-05-23 |
Family
ID=40537427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101587436A Expired - Fee Related CN101403294B (en) | 2008-11-06 | 2008-11-06 | Stratum pressure detection method for interchange of PDC drilling bit and roller bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101403294B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244108A (en) * | 2013-06-05 | 2013-08-14 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590828B (en) * | 2013-11-26 | 2016-03-16 | 中国石油集团川庆钻探工程有限公司 | A kind of well logging dck index method evaluates the method for strata pressure |
| CN103615236A (en) * | 2013-11-26 | 2014-03-05 | 中国石油集团川庆钻探工程有限公司 | Method for real-time monitoring of formation pressure by means of remote mud logging information |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0697501A2 (en) * | 1994-08-15 | 1996-02-21 | Halliburton Company | Integrated well drilling and formation evaluation system |
| CN1138134A (en) * | 1995-06-09 | 1996-12-18 | 江汉石油学院 | Testing method of formation rock drillability |
| CN1648410A (en) * | 2004-01-30 | 2005-08-03 | 施卢默格海外有限公司 | Method for determining pressure of earth formations |
| WO2009008731A1 (en) * | 2007-07-06 | 2009-01-15 | Statoilhydro Asa | Devices and methods for formation testing by measuring pressure in an isolated variable volume |
-
2008
- 2008-11-06 CN CN2008101587436A patent/CN101403294B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0697501A2 (en) * | 1994-08-15 | 1996-02-21 | Halliburton Company | Integrated well drilling and formation evaluation system |
| CN1138134A (en) * | 1995-06-09 | 1996-12-18 | 江汉石油学院 | Testing method of formation rock drillability |
| CN1648410A (en) * | 2004-01-30 | 2005-08-03 | 施卢默格海外有限公司 | Method for determining pressure of earth formations |
| WO2009008731A1 (en) * | 2007-07-06 | 2009-01-15 | Statoilhydro Asa | Devices and methods for formation testing by measuring pressure in an isolated variable volume |
Non-Patent Citations (3)
| Title |
|---|
| 余明发等.《随钻地层压力检测方法及其应用》.《内蒙古石油化工》.2007,(第8期),第196-199页. * |
| 杨进等.《地层压力随钻检测新方法及其应用》.《石油钻探技术》.1998,第26卷(第2期),第16-18页. * |
| 陈永明.《压差校正可提高d指数地层压力检测精度》.《钻采工艺》.1994,第17卷(第4期),第25-27页. * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244108A (en) * | 2013-06-05 | 2013-08-14 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
| CN103244108B (en) * | 2013-06-05 | 2014-06-25 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101403294A (en) | 2009-04-08 |
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Granted publication date: 20120523 Termination date: 20121106 |