CN104500056B - A kind of low pressure reservoir coal bed gas well DST well-logging methods - Google Patents
A kind of low pressure reservoir coal bed gas well DST well-logging methods Download PDFInfo
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- CN104500056B CN104500056B CN201410663654.2A CN201410663654A CN104500056B CN 104500056 B CN104500056 B CN 104500056B CN 201410663654 A CN201410663654 A CN 201410663654A CN 104500056 B CN104500056 B CN 104500056B
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- Prior art keywords
- well
- valve
- packer
- flowing
- shut
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
A kind of low pressure reservoir coal bed gas well DST well-logging methods, which is characterized in that including steps are as follows：Logical, well-flushing, according to the requirement through wash well of regulation；It measures tubing string and calculates packer set position；Lower tubular column；Packer setting；One opens flowing；One closes recovery；Two open flowing；Two close recovery；Removing seal for packer；Play test string；Sampling；Electronic pressure gauge data readback stores after the assay was approved.This method can it is accurate, comprehensively, quickly obtain coal seam reservoirs parameter, surveyed parameter is closer to coal seam reservoirs self character.
Description
Technical field
The invention belongs to a kind of reservoir coal bed gas well DST well-logging methods, especially disclose a kind of low pressure reservoir coal bed gas
Well DST well-logging methods.
Background technology
Coal seam reservoirs parameter testing is the key technology of cbm development, and Chinese coal seam reservoirs largely have the characteristics that low pressure,
It is more serious to the pollution of coal seam reservoirs in drilling process.Traditional coal seam reservoirs parameter testing technology all based on injection, injection rate is small,
Testing time is long, and contaminated zone may be not passed through by injecting fluid during the test so that get parms distortion；Coal seam is physical property
Sensitive reservoir by essence changes coal seam reservoirs property for low pressure, ultralow pressure reservoir injection fluid, can not be obtained by test
Take reliable reservoir parameter.
Invention content
The purpose of the present invention is to provide a kind of low pressure reservoir coal bed gas well DST well-logging methods, this method can be accurate, complete
Face quickly obtains coal seam reservoirs parameter, and surveyed parameter is closer to coal seam reservoirs self character.
In order to achieve the above objectives, the present invention adopts the following technical scheme that：A kind of well testing sides low pressure reservoir coal bed gas well DST
Method, which is characterized in that including steps are as follows：Logical, well-flushing, according to the requirement through wash well of regulation；It measures tubing string and calculates packer
Setting position；Lower tubular column；Pressure gauge enrolls data programming, after by check problem, the pressure gauge support that is fitted into test string
Cylinder, the program that electronics shut-in valve opens two passes according to two are set, and ground experiment is primary, it is ensured that shut-in valve works normally；Electronics closes
Well valve is gone into the well with closed state, and being first switched on from going into the well shut-in valve will there are time enough to complete lower tubular column and packer
It sets；Packer setting；According to the model of packer and principle is set, selection suitably sets parameter, implements packer setting；
Annulus liquid level is observed, leakage situation is checked, such as finds leakage, need to ascertain the reason and set again；One opens flowing；Until electronics closing well
The first time well opening time of valve setting, electronics shut-in valve automatically opens, due to inside tubing string at this time and atmosphere, coal seam reservoirs stream
Body automatically flows under the action of itself in tubing string, and certain drop dirt de-plugging is played the role of in this time flowing, and flowing time is set as
5min；One closes recovery；After one opens flowing, electronics shut-in valve is automatically closed, and coal seam reservoirs pressure starts slowly to restore, this
Process setting is 2-3h；Two open flowing；One, which closes recovery, terminates, and electronics shut-in valve automatically opens again, starts second and flows, and two
It is 20-30min to open flowing time；Two close recovery；After two open flowing, electronics shut-in valve is closed, and it is extensive to start second of pressure
Multiple, this time pressure recovery data will be used for data interpretation, this process is set as continuing 18-20h, it may be necessary to be appropriately extended；
Removing seal for packer；After two close pressure recovery, electronics shut-in valve implements removing seal for packer still in closed state；Play test
Tubing string；Height when seeing liquid level in tubing string is observed when playing test string, to verify water yield；Sampling；Tubing string is whole
When taking-up, the liquid taken in tubing string is packed into specified container, is sent into lab analysis chemical examination；Electron pressure counts back
It puts, store after the assay was approved.
Beneficial effects of the present invention are：
One open flowing during can to drilling process in coal seam reservoirs pollution play the role of certain de-plugging；It can survey
The water yield for obtaining coal seam reservoirs, reference is provided for subsequent mining；Coal seam reservoirs fluid sample can be obtained, and carries out analytical test,
Reference is provided for coal seam reservoirs fracturing reform；Testing time is short, general 24 hours；It is not injected into fluid, avoids exotic pair
The interference of coal seam reservoirs characteristic, characteristic of the test data closer to coal seam reservoirs itself.
Description of the drawings
Fig. 1 is the test string mounting structure schematic diagram of the present invention.
Specific implementation mode
Below in conjunction with embodiment, next the present invention will be described in detail.
A kind of low pressure reservoir coal bed gas well DST well-logging methods, which is characterized in that including steps are as follows：
(a) lead to, well-flushing, according to the requirement through wash well of regulation；
(b) it measures tubing string and calculates packer set position；
(c) lower tubular column；
Pressure gauge enrolls data programming, and after by check problem, the manometer being fitted into test string, electronics closes
The program that well valve opens two passes according to two is set, and ground experiment is primary, it is ensured that shut-in valve works normally；Electronics shut-in valve is to close
State is gone into the well, and being first switched on from going into the well shut-in valve will there are time enough to complete lower tubular column and packer setting；
(e) packer setting
According to the model of packer and principle is set, selection suitably sets parameter, implements packer setting；Observe annular space
Liquid level checks leakage situation, such as finds leakage, need to ascertain the reason and set again；
(f) one flowing is opened
Until the first time well opening time of electronics shut-in valve setting, electronics shut-in valve automatically opens, due in tubing string at this time
Portion and atmosphere, coal seam reservoirs fluid automatically flow under the action of itself in tubing string, and certain drop dirt solution is played in this time flowing
Stifled effect, flowing time are set as 5min；
(g) one recovery is closed
After one opens flowing, electronics shut-in valve is automatically closed, and coal seam reservoirs pressure starts slowly to restore, this process is set
It is set to 2-3h；
(h) two flowing is opened
One pass restores to terminate, and electronics shut-in valve automatically opens again, starts second and flows, and two open flowing time as 20-
30min；
(i) two recovery is closed
After two open flowing, electronics shut-in valve is closed, and starts second of pressure recovery, and this time pressure recovery data are used
In data interpretation, this process is set as continuing 18-20h, it may be necessary to be appropriately extended；
(j) removing seal for packer
After two close pressure recovery, electronics shut-in valve implements removing seal for packer still in closed state；
(l) test string is played
Height when seeing liquid level in tubing string is observed when playing test string, to verify water yield；
(m) it samples
When tubing string all takes out, the liquid taken in tubing string is packed into specified container, is sent into lab analysis chemical examination；
(n) electronic pressure gauge data readback, store after the assay was approved.
Claims (1)
1. a kind of low pressure reservoir coal bed gas well DST well-logging methods, which is characterized in that including steps are as follows：
(a) lead to, well-flushing, according to the requirement through wash well of regulation；
(b) it measures tubing string and calculates packer set position；
(c) lower tubular column；
Pressure gauge enrolls data programming, after by check problem, the manometer being fitted into test string, and electronics shut-in valve
The program that two passes are opened according to two is set, and ground experiment is primary, it is ensured that shut-in valve works normally；Electronics shut-in valve is with closed state
It goes into the well, being first switched on from going into the well shut-in valve will there are time enough to complete lower tubular column and packer setting；
(e) packer setting
According to the model of packer and principle is set, selection suitably sets parameter, implements packer setting；Observe annular space liquid
Face checks leakage situation, such as finds leakage, need to ascertain the reason and set again；
(f) one flowing is opened
Until the first time well opening time of electronics shut-in valve setting, electronics shut-in valve automatically opens, due to inside tubing string at this time and
Atmosphere, coal seam reservoirs fluid automatically flow under the action of itself in tubing string, and this time flowing is played certain drop dirt de-plugging and made
With flowing time is set as 5min；
(g) one recovery is closed
After one opens flowing, electronics shut-in valve is automatically closed, and coal seam reservoirs pressure starts slowly to restore, this process setting is
2-3h；
(h) two flowing is opened
One pass restores to terminate, and electronics shut-in valve automatically opens again, starts second and flows, and two open flowing time as 20-
30min；
(i) two recovery is closed
After two open flowing, electronics shut-in valve is closed, and starts second of pressure recovery, and this time pressure recovery data will be used to provide
Material explains that this process is set as continuing 18-20h；
(j) removing seal for packer
After two close pressure recovery, electronics shut-in valve implements removing seal for packer still in closed state；
(1) test string is played
Height when seeing liquid level in tubing string is observed when playing test string, to verify water yield；
(m) it samples
When tubing string all takes out, the liquid taken in tubing string is packed into specified container, is sent into lab analysis chemical examination；
(n) electronic pressure gauge data readback, store after the assay was approved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663654.2A CN104500056B (en) | 2014-11-18 | 2014-11-18 | A kind of low pressure reservoir coal bed gas well DST well-logging methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663654.2A CN104500056B (en) | 2014-11-18 | 2014-11-18 | A kind of low pressure reservoir coal bed gas well DST well-logging methods |
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| Publication Number | Publication Date |
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| CN104500056A CN104500056A (en) | 2015-04-08 |
| CN104500056B true CN104500056B (en) | 2018-11-06 |
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| CN201410663654.2A Active CN104500056B (en) | 2014-11-18 | 2014-11-18 | A kind of low pressure reservoir coal bed gas well DST well-logging methods |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106812521A (en) * | 2015-11-30 | 2017-06-09 | 中国石油天然气股份有限公司 | Formation testing device and formation testing tubing string |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493788A (en) * | 2011-12-15 | 2012-06-13 | 中国石油天然气股份有限公司 | Method of gas recovery by water drainage for high-coal-rank coal-bed methane well |
| CN102720473A (en) * | 2011-03-31 | 2012-10-10 | 中联煤层气有限责任公司 | Method for exploiting coal bed gas |
| CN103382834A (en) * | 2013-07-25 | 2013-11-06 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Separated-layer pressure measurement technology by adopting intelligent switches |
| CN103590813A (en) * | 2013-10-30 | 2014-02-19 | 中国石油天然气股份有限公司 | Method, tubular column and device for testing dynamic reserves of two-layer commingled producing gas well |
| CN203570308U (en) * | 2013-10-11 | 2014-04-30 | 中煤科工集团西安研究院有限公司 | Formation testing system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201012176D0 (en) * | 2010-07-20 | 2010-09-01 | Metrol Tech Ltd | Well |
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2014
- 2014-11-18 CN CN201410663654.2A patent/CN104500056B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720473A (en) * | 2011-03-31 | 2012-10-10 | 中联煤层气有限责任公司 | Method for exploiting coal bed gas |
| CN102493788A (en) * | 2011-12-15 | 2012-06-13 | 中国石油天然气股份有限公司 | Method of gas recovery by water drainage for high-coal-rank coal-bed methane well |
| CN103382834A (en) * | 2013-07-25 | 2013-11-06 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Separated-layer pressure measurement technology by adopting intelligent switches |
| CN203570308U (en) * | 2013-10-11 | 2014-04-30 | 中煤科工集团西安研究院有限公司 | Formation testing system |
| CN103590813A (en) * | 2013-10-30 | 2014-02-19 | 中国石油天然气股份有限公司 | Method, tubular column and device for testing dynamic reserves of two-layer commingled producing gas well |
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| CN104500056A (en) | 2015-04-08 |
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