CN115434670A - Coal-bed gas well swabbing negative pressure blockage removal yield increase method - Google Patents
Coal-bed gas well swabbing negative pressure blockage removal yield increase method Download PDFInfo
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- CN115434670A CN115434670A CN202211076725.XA CN202211076725A CN115434670A CN 115434670 A CN115434670 A CN 115434670A CN 202211076725 A CN202211076725 A CN 202211076725A CN 115434670 A CN115434670 A CN 115434670A
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- coal
- plug assembly
- bed gas
- gas well
- leather plug
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000010985 leather Substances 0.000 claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 18
- 235000020681 well water Nutrition 0.000 claims abstract description 7
- 239000002349 well water Substances 0.000 claims abstract description 7
- 238000005065 mining Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 230000004936 stimulating effect Effects 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 7
- 239000002817 coal dust Substances 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000008021 deposition Effects 0.000 abstract description 2
- 239000010419 fine particle Substances 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical & Material Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of yield increase of coal-bed gas wells, and particularly relates to a swabbing negative-pressure blockage removal yield increase method for a coal-bed gas well. The method solves the problem that the reservoir is blocked and gas is not produced in the drainage and production process after the coal-bed gas well is successfully drilled and fractured, and comprises the following steps: a leather plug assembly capable of plugging the coal-bed gas well is lowered to a designed position in the coal-bed gas well; well water is injected into the coal-bed gas well; lifting and lowering the leather plug assembly to enable the leather plug assembly to move up and down in the coal bed gas well; after the leather plug assembly is repeatedly lifted and lowered, the leather plug assembly is lifted out for drainage and mining. In the construction process, the plug assembly reciprocates up and down in the shaft, so that the deposition state of the plug around the perforation section is continuously changed, and fine particles, coal dust and coal dust in the area influenced by the fluid in the reservoir stratum can be partially carried out, thereby playing the role of dredging a gas production channel. In the operation process, the propping agent of the gas generation channel is not damaged.
Description
Technical Field
The invention belongs to the technical field of yield increase of coal-bed gas wells, and particularly relates to a swabbing negative-pressure blockage removal yield increase method for a coal-bed gas well.
Background
Along with the production of the coal-bed gas well, a large amount of coal-bed gas and water are produced, one part of fracturing sand and coal dust with the diameter smaller than that of the perforation hole can follow out, the other part of coal particles with the diameter larger than that of the perforation hole or smaller coal particles are mutually extruded and blocked outside the perforation hole, and along with the long-term production, the part of blocking objects blocked outside the perforation hole can block smaller sand particles and coal dust, and the number of the blocking objects is increased; the gas production channel is smaller and smaller or even blocked by further prolonging the drainage and production time, and the phenomenon that the gas quantity is reduced or even the gas is not produced in the coal-bed gas well can occur.
At present, nitrogen unblocking is generally used in the same industry, and the nitrogen unblocking method is characterized in that a liquid nitrogen pump truck is used for injecting nitrogen with large discharge capacity into a stratum, a blocking object is pushed to move towards the deep part of the stratum through high-pressure nitrogen, then the blocking object is quickly blown out, and then the blocking object is discharged back to the ground. By applying the method to remove the blockage, the gas production rate rises quickly in a short period, and after a period of drainage and production, the gas production rate drops quickly, even the original yield cannot be recovered; the original stratum channel is destroyed by using the nitrogen unblocking process, the fractured sand is transported to the deep part of the stratum, after normal drainage and mining are recovered, the stratum lacks the hard propping agent and replaces the hard propping agent with the fragments in the coal bed, the stratum is closed after a long time, the coal bed gas is temporarily sealed in the stratum, and repeated unblocking is needed to recover the yield again, so that the purpose of unblocking can be achieved, and the unblocking of the propping agent is not destroyed.
Disclosure of Invention
The invention provides a pumping negative pressure blockage removal production increasing method for a coal-bed gas well, aiming at solving the problem that the gas cannot be produced due to reservoir blockage in the drainage and production process after the coal-bed gas well is successfully drilled and fractured.
The invention adopts the following technical scheme: a coal bed gas well swabbing negative pressure blockage removal and yield increase method comprises the following steps: a leather plug assembly capable of plugging the coal-bed gas well is lowered to a designed position in the coal-bed gas well; well water is injected into the coal-bed gas well; lifting and lowering the leather plug assembly to enable the leather plug assembly to move up and down in the coal bed gas well; after the leather plug assembly is repeatedly lifted and lowered, the leather plug assembly is lifted out for drainage and mining.
The design position is 2m above the roof of the target coal seam.
And d, carrying out 2-3m high harvest on the water injected into the well water.
And (4) putting down the leather plug assembly to be 1-2m below the layer bottom plate of the target coal layer.
The number of times of lifting and lowering the leather plug assembly is more than or equal to 100 times.
The leather plug assembly is installed at the bottom of an original well oil pipe and is lifted and lowered by a ground workover vehicle.
The plug components are connected in series with 2-3 groups.
The leather plug assembly comprises an upper pressing plate, a leather plug and a lower pressing plate, the leather plug is arranged between the upper pressing plate and the lower pressing plate, two adjacent sets of leather plug assemblies are connected into a whole through a lower hoop, the leather plug assembly on the uppermost layer is fixed with the bottom of an original well oil pipe through the upper hoop, and the bottom of the leather plug assembly on the lowermost layer is provided with a plug.
The outer ring of the upper pressure plate is provided with three arc-shaped bulges.
Compared with the prior art, the invention has the following beneficial effects:
1) In the construction process, the plug assembly reciprocates up and down in the shaft, so that the deposition state of the plug around the perforation section is continuously changed, and fine particles, coal dust and coal dust in the area influenced by the fluid in the reservoir stratum can be partially carried out, thereby playing the role of dredging a gas production channel. In the operation process, the propping agent of the gas production channel is not damaged.
2) The invention only needs the original well repairing equipment, does not need other auxiliary equipment, and has low construction operation safety risk.
3) After the original well production pipe column is provided, original well repair equipment and pipes are only needed, the construction period can be finished after 2-3 working days, and the operation period is short.
4) The invention has the advantages of less used equipment, convenient material acquisition and simple manufacture of the underground-mounted plug removing tool, can be repeatedly used for multiple wells only by replacing the plug, and greatly reduces the construction cost.
Drawings
FIG. 1 is a schematic view of a coal bed methane well structure, equipment and a plug pumping negative pressure plugging removal tool
In the figure: 1-upper coupling, 2-upper pressing plate, 3-leather plug component, 4-lower pressing plate, 5-lower coupling, 6-plug, 7-mesh coal bed, 8-original well oil pipe, 9-production casing, 10-surface casing, 11-ground workover vehicle, 12-water taking point and 13-perforation section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a pumping negative pressure blockage relieving and yield increasing method for a coal-bed gas well comprises the following steps:
the first step is as follows: and (3) putting the leather plug component 3 capable of plugging the coal-bed gas well into the design position of the coal-bed gas well. The design position of the initial lowering is from the leather plug component 3 to the position 2m above the target coal seam roof.
The second step: and injecting well water into the coal-bed gas well for 2-3 m.
The third step: and lifting and lowering the leather plug component 3 to enable the leather plug component 3 to move up and down in the coal-bed gas well.
After 2-3m of specific injection well water, the plug assembly 3 is downwards placed to 1-2m below a bottom plate of a target coal seam 7, at the moment, the water column above the plug assembly 3 generates pressure on the upper surface of the plug assembly 3 (the plug assembly 3 plays a role of a packer), and under the action of the pressure, water enters into some stratums with slight channels.
After the leather plug component 3 reaches the bottom plate of the target coal seam 7, the pipe column string is lifted quickly to move the leather plug component 3 to the highest point, water entering the stratum below the leather plug component 3 can be sucked out again under the action of pumping force, and water above the leather plug component 3 can enter the stratum under the pressure of the water column.
And (3) lowering the plug assembly 3, transmitting the gravity of the oil pipe above the plug assembly 3 to the water column below the plug assembly 3 through the plug, and squeezing the water column below the plug into the stratum through the pressure generated by free fall.
The fourth step: and repeatedly constructing for hundreds of times up and down according to the flow, and lifting the plug assembly for drainage and mining.
In the process, the used leather plug component 3 comprises an upper pressing plate, a leather plug and a lower pressing plate, the leather plug is arranged between the upper pressing plate and the lower pressing plate, two adjacent sets of leather plug components are connected into a whole through a lower coupling, the leather plug component on the uppermost layer is fixed with the bottom of an original well oil pipe through the upper coupling, and the bottom of the leather plug component on the lowermost layer is provided with a plug.
In order to increase the pumping effect, 2-3 groups of pumping plug tools can be connected in series at one time to increase the pumping force.
When the upper press plate 2 is processed and manufactured, three arc-shaped bulges are reserved on the outer ring, and the upper press plate plays a role of a centralizer.
In the coal-bed gas well plug swabbing negative pressure blockage relieving and yield increasing test of the coal-bed gas enterprise, the total test is carried out on 45 wells, and the daily average gas production of a single well rises by 50 percent compared with that before the test, so that the blockage relieving and yield increasing process is practical and effective, and is a relatively direct and effective process for solving the problems that no gas well is produced after drilling and fracturing are successful or the coal-bed gas well has poor drainage and production effects in a short time.
The implementation process of the invention comprises the following steps:
1. the equipment enters a construction site;
2. the original well production pipe column is lifted out, and the pipe is scraped by a scraper when entering the well;
3. the pipe column is lifted out again and is connected with the blockage removing tool string;
4. a leather plug component is put in;
5. detecting a sand surface;
6. placing a plug assembly at a destination level;
7. adding clear water into the upper part of the leather plug component;
8. lifting and lowering the swabbing plug assembly for more than one hundred times;
9. lowering a leather plug assembly to probe a sand surface;
10. extracting the pumping pipe column;
11. recovering normal drainage and production of the lower original well pipe column;
12. and withdrawing the equipment from the construction site.
The structures, the proportions, the sizes, and the like shown in the drawings attached to the present specification are only used for matching with the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes of the proportion relation, or adjustment of the size, should fall within the scope of the technical disclosure of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A coal bed gas well swabbing negative pressure blockage removal and yield increase method is characterized by comprising the following steps:
a leather plug assembly capable of plugging the coal-bed gas well is lowered to a designed position in the coal-bed gas well;
injecting well water into the coal-bed gas well;
lifting and lowering the leather plug assembly to enable the leather plug assembly to move up and down in the coal bed gas well;
and after the leather plug assembly is repeatedly lifted and lowered, the leather plug assembly is lifted out for drainage and mining.
2. The method as recited in claim 1, wherein the design location is 2m above a roof of the target coal seam.
3. The method as recited in claim 2, wherein the amount of injected well water is harvested between 2 and 3 m.
4. The method as claimed in claim 3, wherein the position of lowering the skin plug assembly is 1-2m below the bottom plate of the target coal seam.
5. The method of claim 4, wherein the number of times the wiper plug assembly is lifted up is equal to or greater than 100 times.
6. The method for stimulating production of coal-bed gas well by pumping and negative pressure plugging removal as claimed in claim 5, wherein the skin plug assembly is mounted at the bottom of an oil pipe of a raw well and is lifted and lowered by a ground workover vehicle.
7. The method as recited in claim 6, wherein the packer assembly is connected in series with 2-3 sets.
8. The method as claimed in claim 7, wherein the leather plug assembly comprises an upper pressing plate, a leather plug and a lower pressing plate, the leather plug is arranged between the upper pressing plate and the lower pressing plate, two adjacent leather plug assemblies are connected into a whole through a lower coupling, the leather plug assembly on the uppermost layer is fixed with the bottom of a crude well oil pipe through the upper coupling, and the bottom of the leather plug assembly on the lowermost layer is provided with a plug.
9. The method for stimulating production by plugging under swabbing negative pressure of a coal-bed gas well as recited in claim 8, wherein three arc-shaped protrusions are arranged on the outer ring of the upper pressure plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211076725.XA CN115434670A (en) | 2022-09-05 | 2022-09-05 | Coal-bed gas well swabbing negative pressure blockage removal yield increase method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211076725.XA CN115434670A (en) | 2022-09-05 | 2022-09-05 | Coal-bed gas well swabbing negative pressure blockage removal yield increase method |
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| Publication Number | Publication Date |
|---|---|
| CN115434670A true CN115434670A (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211076725.XA Pending CN115434670A (en) | 2022-09-05 | 2022-09-05 | Coal-bed gas well swabbing negative pressure blockage removal yield increase method |
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| CN (1) | CN115434670A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401879A (en) * | 2002-09-13 | 2003-03-12 | 中国石化胜利油田有限公司采油工艺研究院 | Hydro-impact broken down method and device for oil-water well |
| CN200992988Y (en) * | 2006-12-18 | 2007-12-19 | 辽河石油勘探局 | Oil well forced-discharge negative-pressure blockage removing tool |
| CN201008861Y (en) * | 2007-03-28 | 2008-01-23 | 蔡昆惠 | Simple device for removing obstruction in pipeline |
| CN102312659A (en) * | 2010-07-02 | 2012-01-11 | 崔朝轩 | Pollution-free well workover process for oil field |
| CN102434121A (en) * | 2011-12-14 | 2012-05-02 | 常州大学 | Underground low-frequency swabbing vibration unplugging device and application method thereof |
| CN204827319U (en) * | 2015-07-09 | 2015-12-02 | 辽河石油勘探局 | Water hammer efflux is united negative pressure and is separated stifled tubular column |
| CN209129585U (en) * | 2018-10-11 | 2019-07-19 | 中联煤层气有限责任公司 | A kind of washing well coal bed gas extraction tubing string |
| CN110485966A (en) * | 2019-08-11 | 2019-11-22 | 太原理工大学 | A method of it solving coal dust and blocks coal seam fracture |
| US20210172291A1 (en) * | 2019-12-09 | 2021-06-10 | Saudi Arabian Oil Company | Unblocking wellbores |
| CN216240555U (en) * | 2021-11-09 | 2022-04-08 | 河北省煤田地质局第二地质队 | Combined piston well washing device |
-
2022
- 2022-09-05 CN CN202211076725.XA patent/CN115434670A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401879A (en) * | 2002-09-13 | 2003-03-12 | 中国石化胜利油田有限公司采油工艺研究院 | Hydro-impact broken down method and device for oil-water well |
| CN200992988Y (en) * | 2006-12-18 | 2007-12-19 | 辽河石油勘探局 | Oil well forced-discharge negative-pressure blockage removing tool |
| CN201008861Y (en) * | 2007-03-28 | 2008-01-23 | 蔡昆惠 | Simple device for removing obstruction in pipeline |
| CN102312659A (en) * | 2010-07-02 | 2012-01-11 | 崔朝轩 | Pollution-free well workover process for oil field |
| CN102434121A (en) * | 2011-12-14 | 2012-05-02 | 常州大学 | Underground low-frequency swabbing vibration unplugging device and application method thereof |
| CN204827319U (en) * | 2015-07-09 | 2015-12-02 | 辽河石油勘探局 | Water hammer efflux is united negative pressure and is separated stifled tubular column |
| CN209129585U (en) * | 2018-10-11 | 2019-07-19 | 中联煤层气有限责任公司 | A kind of washing well coal bed gas extraction tubing string |
| CN110485966A (en) * | 2019-08-11 | 2019-11-22 | 太原理工大学 | A method of it solving coal dust and blocks coal seam fracture |
| US20210172291A1 (en) * | 2019-12-09 | 2021-06-10 | Saudi Arabian Oil Company | Unblocking wellbores |
| CN216240555U (en) * | 2021-11-09 | 2022-04-08 | 河北省煤田地质局第二地质队 | Combined piston well washing device |
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