CN109184635B - Method for judging main gas production layer of coal-bed gas well - Google Patents
Method for judging main gas production layer of coal-bed gas well Download PDFInfo
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- CN109184635B CN109184635B CN201811149491.0A CN201811149491A CN109184635B CN 109184635 B CN109184635 B CN 109184635B CN 201811149491 A CN201811149491 A CN 201811149491A CN 109184635 B CN109184635 B CN 109184635B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000012856 packing Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 3
- 239000008398 formation water Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 25
- 238000005065 mining Methods 0.000 abstract description 7
- 239000002356 single layer Substances 0.000 abstract description 3
- 238000009933 burial Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Geochemistry & Mineralogy (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention belongs to the technical field of coal bed gas development and drainage, and particularly relates to a method for judging a main gas production layer of a coal bed gas well. The method comprises the following steps of changing the existing drainage and production system for producing water and gas in an annular space of an oil pipe of the coal-bed gas well into a system for producing gas and water in the oil pipe; a rod-type plunger pump is connected to the bottom of the oil pipe, and mechanical packers are respectively connected to the upper part and the lower part of the pump; according to different burial depths of multi-layer coal, the pumping depth and the specific fixing position of the packer are sequentially adjusted from shallow to deep, and effective packing and single-layer drainage and mining of the upper and lower adjacent coal layers of a target layer are realized by opening the packer; after the target layer is drained and mined for a certain time and the gas yield is basically stable, closing the packer, adjusting the pump hanging depth to the position corresponding to the next target coal layer, and after the gas yield is stable, sequentially adjusting the positions of the pump hanging and the packer downwards to realize one-by-one single-layer drainage and mining of the multi-layer coal; and judging the main gas production layer of the coal-bed gas well according to the average yield of each target coal bed after the drainage and mining are stable.
Description
Technical Field
The invention belongs to the technical field of coal bed gas development and drainage, and particularly relates to a method for judging a main gas production layer of a coal bed gas well.
Background
In the development of the coal bed gas in a multi-layer coal area, in order to improve the development efficiency of the coal bed gas and reduce the cost, a plurality of coal bed gas wells adopt a mode of simultaneously developing a plurality of target layers for coal bed gas exploitation. However, in the process, the coal seam from which the gas produced by the coal-bed gas well mainly comes cannot be clearly judged, and on the contrary, extra trouble is brought to the gas drainage and production of the coal seam, even interlayer interference can be generated among a plurality of coal seams, so that the overall gas production effect of the coal-bed gas well is reduced. Therefore, the main gas production layer of the coal-bed gas well in one area is found, and the method has great significance for guiding the development of the coal-bed gas and improving the gas production efficiency.
Disclosure of Invention
The invention provides a method for judging a main gas production layer of a coal-bed gas well, aiming at solving the problem that the main gas production layer is not clear for the production of coal-bed gas in the development process of the coal-bed gas of a multi-coal-bed area.
The invention adopts the following technical scheme: a method for judging a main gas production layer of a coal-bed gas well comprises the following steps:
1) the bottom of the oil pipe is connected with a rod type plunger pump, and the bottom of the pump is connected with a tail pipe and a plug.
2) And the top and the bottom of the rod type plunger pump are respectively connected with a mechanical packer, and the distance between the two packers is greater than the thickness of the tested coal bed.
3) The packer and plunger pump are run in, temporarily closing the packer.
4) And after the installation is finished, the drainage and production equipment is operated, and the formation water enters the oil pipe through the plunger pump and is discharged through a ground pipeline.
5) When the pressure of the liquid column at the bottom of the well is reduced to the critical desorption pressure of the coal bed, the coal bed starts to desorb, and when the pressure of a pressure gauge at the top of the well is just displayed, the packer is opened to work, so that the effect of packing the top and the bottom of the coal bed is realized.
6) And starting the drainage and production system again, discharging the gas-liquid mixture from the wellhead through the oil pipe and into the gas-water separator, discharging the separated water into the drainage pool, and feeding the separated gas into the gathering and transportation station through the gas delivery pipe.
7) And after drainage and production, the gas production rate of the coal-bed gas well is relatively stable, and when no large change exists, the total gas production rate and the stable daily output of the coal-bed gas well in the time period are recorded.
8) Increasing the length of the oil pipe through the ground, adjusting the plunger pump and the packer to the next target coal bed, circulating the drainage operation of the coal bed until the daily output tends to be stable, and then performing the packing and testing of the third coal bed, and repeating the steps.
9) And comprehensively comparing the gas production conditions of the plurality of coal seams to judge the main gas production layer of the coal-bed gas well.
Compared with the prior art, the invention has the following beneficial effects:
(1) the identification method is simple and has strong operability. The core components of the coal-bed gas well main gas production layer identification method only comprise two packers and plunger pumps, so that the number of underground tools is small, the connection structure is simple, the failure rate in the working process can be reduced, and the operability of the system is improved.
(2) The main production layer identification result is reliable. The purpose coal bed can be effectively isolated through the action of the two packers, the interference of adjacent coal beds is avoided, the combined-layer discharging and mining of the multiple coal beds are divided into independent single-layer coal discharging and mining units, and the reliability of judging and identifying of the main gas production layer is guaranteed.
Drawings
FIG. 1 is a connection diagram of a coal-bed gas well main gas production layer identification method;
in the figure, 1-coal bed, 2-coal bed, 3-coal bed, 4-plug, 5-tail pipe, 6-packer, 7-plunger pump, 8-sleeve, 9-oil sleeve annulus, 10-oil pipe, 11-sucker rod, 12-pressure gauge, 13-flange, 14-pressure limiting valve, 15-gas-water separator, 16-electronic flowmeter, 17-gas pipe, 18-electromagnetic valve and 19-drainage pool.
Detailed Description
Fig. 1 is a connection schematic diagram of a main gas production layer identification method of a coal-bed gas well, and a packer and a plunger pump are lowered to the position of an upper coal bed 1. The packer is closed in advance, the ground drainage system is operated, and the well oil pipe in the shaft is drained out of the ground. When the pressure of the wellhead pressure gauge is displayed, the packer is opened to pack the upper part and the lower part of the coal seam 1, and the influence of the adjacent coal seam on the yield is avoided. At the moment, the produced gas-liquid mixture enters the ground gas-water separator through the oil pipe, when the height of the separated liquid reaches a set position, the electromagnetic valve is opened, and water enters the drainage pool through the drainage pipe. And (3) the separated gas enters a gathering and transportation station through a well gas transmission pipeline, when the daily yield of the coal seam 1 in a certain period of drainage and mining is stable, the drainage and mining test of the coal seam is stopped, and the accumulated gas yield and the stable daily yield can be measured and drained through an electronic flowmeter.
A method for judging a main gas production layer of a coal-bed gas well comprises the following steps:
1) the bottom of the oil pipe 10 is connected with a rod type plunger pump 7, and the bottom of the pump is connected with a tail pipe 5 and a plug 4;
2) the top and the bottom of the rod-type plunger pump 7 are respectively connected with a mechanical packer 6, and the distance between the two packers 6 is larger than the thickness of a tested coal seam;
3) setting the packer 6 and the plunger pump 7 in, and temporarily closing the packer 6;
4) after the installation is finished, the drainage and production equipment is operated, and the formation water enters the oil pipe 10 through the plunger pump 7 and is discharged through a ground pipeline;
5) when the pressure of a liquid column at the bottom of the well is reduced to the critical desorption pressure of the coal bed 1, the coal bed 1 starts to desorb, and when the pressure of a pressure gauge 12 at the wellhead is just displayed, a packer 6 is opened to work, so that the effect of packing the top and the bottom of the coal bed 1 is realized;
6) the drainage and production system is started again, the gas-liquid mixture is discharged out of the wellhead through the oil pipe and enters the gas-water separator 15, the separated water enters the drainage pool 19, and the separated gas enters the gathering and transportation station through the gas pipe 17;
7) after drainage and production, the gas production rate of the coal-bed gas well is relatively stable, and when the gas production rate does not change in a large range, the total gas production rate and the stable daily output of the coal-bed gas well in the time period are recorded;
8) increasing the length of an oil pipe 10 through the ground, adjusting a plunger pump 7 and a packer 6 to the next target coal seam 2, circulating the drainage operation of the coal seam 1 until the daily output tends to be stable, and then performing packing and testing on the third coal seam 3, and repeating the steps;
9) and comprehensively comparing the gas production conditions of the plurality of coal seams to judge the main gas production layer of the coal-bed gas well.
Claims (1)
1. A method for judging a main gas production layer of a coal-bed gas well is characterized by comprising the following steps: the method comprises the following steps: 1) the bottom of the oil pipe (10) is connected with a rod type plunger pump (7), and the bottom of the pump is connected with a tail pipe (5) and a plug (4);
2) the top and the bottom of the rod-type plunger pump (7) are respectively connected with a mechanical packer (6), and the distance between the two packers (6) is greater than the thickness of a tested coal bed;
3) setting the packer (6) and the plunger pump (7) in, and temporarily closing the packer (6);
4) after the installation is finished, the drainage and production equipment is operated, and the formation water enters the oil pipe (10) through the plunger pump (7) and is discharged through a ground pipeline;
5) when the pressure of a liquid column at the bottom of a well is reduced to the critical desorption pressure of the coal bed (1), the coal bed (1) starts to desorb, and when a pressure gauge (12) at the well head just displays the pressure, a packer (6) is opened to work, so that the effect of packing the top and the bottom of the coal bed (1) is realized;
6) the drainage and production system is started again, the gas-liquid mixture is discharged out of the wellhead through the oil pipe and enters the gas-water separator (15), the separated water enters the drainage pool (19), and the separated gas enters the gathering and transportation station through the gas pipe (17);
7) after drainage and production, the gas production rate of the coal-bed gas well is relatively stable, and when the gas production rate does not change in a large range, the total gas production rate and the stable daily output of the coal-bed gas well in the time period are recorded;
8) increasing the length of an oil pipe (10) through the ground, adjusting a plunger pump (7) and a packer (6) to a next target coal seam (2), circulating drainage operation of the coal seam (1) until daily production tends to be stable, and then performing packing and testing on a third coal seam (3) repeatedly;
9) and comprehensively comparing the gas production conditions of the plurality of coal seams to judge the main gas production layer of the coal-bed gas well.
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| CN102191933A (en) * | 2011-03-30 | 2011-09-21 | 北京万普隆能源技术有限公司 | Process for measuring and controlling produced gas of coal bed gas well |
| 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 gas production well |
| CN104747144A (en) * | 2015-02-06 | 2015-07-01 | 中国石油天然气股份有限公司 | Geological stratum selection method based on natural gas multilayer system partial pressure solution |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130180709A1 (en) * | 2012-01-17 | 2013-07-18 | Chevron U.S.A. Inc. | Well Completion Apparatus, System and Method |
| CN107201893B (en) * | 2017-07-28 | 2020-08-04 | 中国矿业大学 | Multi-coal-bed gas well output contribution rate testing and grading device |
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- 2018-09-29 CN CN201811149491.0A patent/CN109184635B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2382028Y (en) * | 1998-11-16 | 2000-06-07 | 马建国 | Dynamic casing well tester |
| CN102191933A (en) * | 2011-03-30 | 2011-09-21 | 北京万普隆能源技术有限公司 | Process for measuring and controlling produced gas of coal bed gas well |
| 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 gas production well |
| CN104747144A (en) * | 2015-02-06 | 2015-07-01 | 中国石油天然气股份有限公司 | Geological stratum selection method based on natural gas multilayer system partial pressure solution |
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