CN114718535B - Method for reversely blocking coal-bed gas well by utilizing high-pressure gas - Google Patents
Method for reversely blocking coal-bed gas well by utilizing high-pressure gas Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 40
- 239000002817 coal dust Substances 0.000 claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 107
- 239000003570 air Substances 0.000 claims description 57
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 238000009530 blood pressure measurement Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 4
- 239000008187 granular material Substances 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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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
- E21B43/25—Methods for stimulating production
- E21B43/255—Methods for stimulating production including the injection of a gaseous medium as treatment fluid into the formation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Treating Waste Gases (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to the field of coalbed methane exploitation and provides a method for reversely unblocking a coalbed methane well by utilizing high-pressure gas. Through newly increasing the coal bed gas well that is used for the deblocking, not only can be through the near buggy granule that blocks up in the coal bed seepage flow passageway of deblocking well injection compressed gas with the blocking well take out the shaft bottom, eliminate the wellbore and block up, the productivity of the blocking well of improvement by a wide margin, can also increase the output of coal bed gas through the newly-increased coal bed gas well. According to the reverse gas blocking removal and permeation enhancement method, on the premise that the blocking removal requirement of the coal-bed gas well is met, most coal-bed gas wells blocked by coal dust are restored to commercial exploitation values, the yield of the coal-bed gas can be greatly increased, and the purpose of efficiently extracting the coal-bed gas is achieved. The invention is suitable for blocking removal of vertical coal-bed gas wells and horizontal coal-bed gas wells and blocking removal of various gas extraction drilling holes, and has the important effect of good blocking removal effect and high application value, and secondary damage to reservoirs can not be caused.
Description
Technical Field
The invention belongs to the technical field of coalbed methane exploitation, and particularly relates to a method for reversely unblocking a coalbed methane well by utilizing high-pressure gas.
Background
Coalbed methane plays an important role in global energy structures as an important unconventional natural gas resource. However, most mining areas in China have the characteristic of high storage and low permeability, and coal bed gas is mined in a drainage and depressurization mode by drilling a vertical well and a horizontal well, so that the effect is general. Thus, it is often desirable to fracture a coal-bed gas well by reservoir reformation means such as hydraulic fracturing. Under the influence of engineering disturbance (damage to a coal reservoir caused by construction such as drilling and fracturing) in the coal bed gas exploitation process, coal dust is inevitably generated, the generation and migration of the coal dust can block a natural seepage channel of a coal bed gas well, well hole blocking is caused, the diversion capacity of the coal bed is reduced, the productivity and service life of the coal bed gas well are influenced, and serious coal dust blocking and deposition phenomena can even cause blocking of a drainage pump, so that the problems of pump burying, pump blocking and the like are caused.
At present, the method for removing the blockage of the coal-bed gas well mainly comprises a secondary pressure blockage removing method (patent number: CN 104251131A) and a multi-round compressed air blockage removing method (patent number: CN 108729891A). The method is characterized in that high-pressure water or high-pressure gas is repeatedly introduced into a coal bed gas well to wash the well, so that the well bore is dredged, coal dust causing well bore blockage is carried to the ground through clear water or gas, and well bore blockage is eliminated. However, the method can only remove the coal dust precipitated at the bottom of the well and the coal dust blocked in the cracks nearby the well, can not carry the coal dust blocked in the coal seam seepage channel out, and even can cause secondary damage to the reservoir, so that the reservoir is more seriously blocked. Thus, there is currently no more efficient method for plugging a coal-bed gas well.
Disclosure of Invention
The invention aims to overcome the defects of the existing blocking removal technology, and provides a method for reversely blocking removal of a coal-bed gas well by utilizing high-pressure gas, which solves the problems that the blocking removal effect by adopting secondary pressure blocking removal and multi-pass compressed air is not ideal and the blocked coal-bed gas well cannot be effectively dredged and blocked, so that the capacity of the coal-bed gas well blocked by coal dust is restored.
The invention is realized by the following technical scheme:
a method for reversely blocking a coal-bed gas well by utilizing high-pressure gas comprises the following specific steps:
1) At least one unblocking well for unblocking is established at a position 50-1000m away from the blocked well;
2) Respectively placing high-pressure oil pipes in a shaft for blocking and unblocking the well to serve as an air extraction pipe column and a gas compression pipe column, enabling the air extraction pipe column and the gas compression pipe column to abut against a coal seam to serve as a target layer, and then installing a wellhead and a ground pipeline;
3) After the connection of the air extraction pipeline and the air compression pipeline is completed, a wellhead valve for blocking and unblocking the well is closed, the high-pressure air of 20MPa is utilized to carry out air tightness inspection on the ground pipeline, after the air compression is carried out for 5 minutes, if the pipeline pressure is still kept above 19MPa, the pressure measurement is qualified;
4) After the pressure measurement is qualified, opening an injection control valve of the unblocking well and an annulus valve of the shaft, and then starting an air compressor to inject high-pressure gas into the unblocking well;
5) Stopping injecting after injecting high-pressure gas for 48 hours, opening a pumping control valve of a plugged well and an annular valve of a shaft, controlling the opening of the valve, and keeping the gas flow rate of the wellhead of the plugged well at 200-600m 3 Between/min, coal dust particles precipitated in a seepage passage of the plugged well are carried out of the coal seam cracks under the action of gas pressure difference, then reach a wellhead of the plug removal well, and the coal dust in wellhead gas is collected through an extraction system;
6) Along with the continuous injection of high-pressure gas in the blocking removal well into the coal bed, gradually carrying out coal dust particles blocked in a seepage channel of the blocking well, and closing a gas compressing and air extracting valve when no coal dust is carried out in the gas flow blocking the wellhead of the blocking well, so as to finish blocking removal construction;
7) After the blocking removal work is completed, cleaning up massive solid phase particles remained at the bottom of the blocked well through a bottom hole sand-bailing device, then putting into a production pipe column for blocking and blocking removal, and recovering the production of the discharged water and the gas of the blocked well.
The blocked well is any one of a vertical well, a horizontal well or a horizontal borehole.
For at least one vertical blocking removing well and more than two vertical blocking removing wells, the blocking wells are required to be arranged in a single row and are respectively positioned at two sides and the periphery of the blocking well, and the distance between the vertical wells is 50-1000m.
For the horizontal coalbed methane well, one or two horizontal unblocking wells are arranged in a single row, and are respectively positioned at two sides of the blocking well, and the interval between the horizontal unblocking wells is 50-500m.
The high-pressure gas is any one of air, nitrogen and carbon dioxide
Compared with the prior art, the invention not only can carry the coal dust particles blocked in the coal bed seepage channel near the blocking well out of the bottom of the well by injecting compressed gas into the blocking well by newly adding the coal bed gas well for blocking removal, eliminate the blocking of the well, greatly improve the productivity of the blocking well, but also can increase the yield of the coal bed gas by newly adding the coal bed gas well. The reverse gas blocking removal and permeation increasing method can greatly increase the yield of the coal bed gas on the premise of meeting the blocking removal requirement of the coal bed gas well, and achieves the purpose of efficiently extracting the coal bed gas. The invention is suitable for blocking removal of vertical coal-bed gas wells and horizontal coal-bed gas wells and blocking removal of various gas extraction drilling holes.
Drawings
FIG. 1 is a schematic diagram of a vertical coal bed gas well reverse plugged with high pressure air.
FIG. 2 is a schematic diagram of a horizontal coalbed methane well reverse plugged with high pressure nitrogen.
FIG. 3 is a schematic diagram of reverse plugging of a horizontal borehole with high pressure carbon dioxide.
The invention is further illustrated by way of example with reference to the accompanying drawings.
Detailed Description
Example 1
As shown in figure 1, in the method for reversely blocking a vertical coal-bed gas well by using high-pressure air, two vertical coal-bed gas wells are arranged at a position 600m away from a blocked well (vertical coal-bed gas well) to serve as blocking-removing wells, the blocking-removing wells are well-fixed according to a known method, a compressed air pipeline is arranged, and an air extraction pipeline is arranged in the blocked well.
A method for reversely blocking a vertical coal bed gas well by utilizing high-pressure air comprises the following specific steps:
1) Two unblocking wells for unblocking are established at a position 600m away from the blocked well and are respectively positioned at two sides of the blocked well;
2) Respectively placing high-pressure oil pipes in a shaft for blocking and unblocking the well as an air extraction pipe column and a gas compression pipe column, enabling the air extraction pipe column and the gas compression pipe column to be close to a coal seam, and then installing a well head and a ground pipeline;
3) After the connection of the air extraction pipeline and the air compression pipeline is completed, a wellhead valve for blocking and unblocking the well is closed, the air tightness of the ground pipeline is checked by using high-pressure air of 20MPa, and after the air compression is carried out for 5 minutes, if the pipeline pressure is still kept above 19MPa, the pressure measurement is qualified;
4) After the pressure measurement is qualified, opening an injection control valve of the unblocking well and an annulus valve of the shaft, and then starting an air compressor to inject high-pressure gas into the unblocking well;
5) Stopping injecting after injecting the high-pressure gas for 48 hours, opening a pumping control valve of a plugged well and an annular valve of a shaft, controlling the opening of the valve, and keeping the gas flow rate of the wellhead of the plugged well at 500m 3 About/min, coal dust particles precipitated in a seepage channel of a plugged well are carried out of a coal seam fracture under the action of gas pressure difference, then reach a wellhead of a plug removal well, and coal dust in wellhead gas is collected through an extraction system;
6) Along with the continuous injection of high-pressure gas in the blocking removal well into the coal bed, gradually carrying out coal dust particles blocked in a seepage channel of the blocking well, and closing a gas compressing and air extracting valve when no coal dust is carried out in the gas flow blocking the wellhead of the blocking well, so as to finish blocking removal construction;
7) After the blocking removal work is finished, cleaning up massive solid phase particles remained at the bottom of the blocked well through a bottom hole sand-bailing device, then putting into a production pipe column for blocking and blocking removal, recovering the drainage and gas production of the blocked well, and using two newly-built blocking removal wells for the production of coalbed methane.
Example 2
As shown in figure 2, in the method for reversely unblocking the horizontal coal-bed gas well by utilizing high-pressure nitrogen, two horizontal coal-bed gas wells are arranged 300m away from a blocked well (horizontal coal-bed gas well) to serve as unblocked wells, the unblocked wells are well-fixed according to a known method, a compressed air pipeline is arranged, and an air extraction pipeline is arranged in the blocked well.
A method for reversely unblocking a horizontal coal bed gas well by utilizing high-pressure nitrogen comprises the following specific steps:
1) Two unblocking wells for unblocking are established at the position 300m away from the blocked well and are respectively positioned at two sides of the blocked well;
2) Respectively placing high-pressure oil pipes in a shaft for blocking and unblocking the well as an air extraction pipe column and a gas compression pipe column, enabling the air extraction pipe column and the gas compression pipe column to be close to a coal seam, and then installing a well head and a ground pipeline;
3) After the connection of the air extraction pipeline and the air compression pipeline is completed, a wellhead valve for blocking and unblocking the well is closed, the high-pressure nitrogen of 20MPa is utilized to carry out air tightness inspection on the ground pipeline, after the air compression is carried out for 5 minutes, if the pipeline pressure is still kept above 19MPa, the pressure measurement is qualified;
4) After the pressure measurement is qualified, opening an injection control valve of the unblocking well and an annulus valve of the shaft, and then starting an air compressor to inject high-pressure gas into the unblocking well;
5) Stopping injecting after injecting the high-pressure gas for 48 hours, opening a pumping control valve of a plugged well and an annular valve of a shaft, controlling the opening of the valve, and keeping the gas flow rate of the wellhead of the plugged well at 300m 3 About/min, coal dust particles precipitated in a seepage channel of a plugged well are carried out of a coal seam fracture under the action of gas pressure difference, then reach a wellhead of a plug removal well, and coal dust in wellhead gas is collected through an extraction system;
6) Along with the continuous injection of high-pressure gas in the blocking removal well into the coal bed, gradually carrying out coal dust particles blocked in a seepage channel of the blocking well, and closing a gas compressing and air extracting valve when no coal dust is carried out in the gas flow blocking the wellhead of the blocking well, so as to finish blocking removal construction;
7) After the blocking removal work is finished, cleaning up massive solid phase particles remained at the bottom of the blocked well through a bottom hole sand-bailing device, then putting into a production pipe column for blocking and blocking removal, recovering the drainage and gas production of the blocked well, and using two newly-built blocking removal wells for the production of coalbed methane.
Example 3
As shown in fig. 3, in the method for reversely plugging a horizontal coalbed methane drilling by using high-pressure carbon dioxide, two horizontal coalbed methane drilling holes are arranged at a position 50m away from a plugged well (a horizontal coalbed methane well) to serve as the plugged well, the plugged well is well-plugged according to a known method, a compressed air pipeline is arranged, and an air extraction pipeline is arranged in the plugged well.
A method for reversely unblocking horizontal coalbed methane by using high-pressure carbon dioxide comprises the following specific steps:
1) Two unblocking wells for unblocking are established at the position 50m away from the blocking well and are respectively positioned at two sides of the blocking well;
2) Respectively placing high-pressure oil pipes in a shaft for blocking and unblocking the well as an air extraction pipe column and a gas compression pipe column, enabling the air extraction pipe column and the gas compression pipe column to be close to a coal seam, and then installing a well head and a ground pipeline;
3) After the connection of the air extraction pipeline and the air compression pipeline is completed, a wellhead valve for blocking and unblocking the well is closed, the high-pressure nitrogen of 20MPa is utilized to carry out air tightness inspection on the ground pipeline, after the air compression is carried out for 5 minutes, if the pipeline pressure is still kept above 19MPa, the pressure measurement is qualified;
4) After the pressure measurement is qualified, opening an injection control valve of the unblocking well and an annulus valve of the shaft, and then starting an air compressor to inject high-pressure gas into the unblocking well;
5) Stopping injecting after injecting the high-pressure gas for 48 hours, opening a pumping control valve of a plugged well and an annular valve of a shaft, controlling the opening of the valve, and keeping the gas flow rate of the wellhead of the plugged well at 200m 3 About/min, coal dust particles precipitated in a seepage channel of a plugged well are carried out of a coal seam fracture under the action of gas pressure difference, then reach a wellhead of a plug removal well, and coal dust in wellhead gas is collected through an extraction system;
6) Along with the continuous injection of high-pressure gas in the blocking removal well into the coal bed, gradually carrying out coal dust particles blocked in a seepage channel of the blocking well, and closing a gas compressing and air extracting valve when no coal dust is carried out in the gas flow blocking the wellhead of the blocking well, so as to finish blocking removal construction;
7) After the blocking removal work is finished, cleaning up massive solid phase particles remained at the bottom of the blocked well through a bottom hole sand-bailing device, then putting into a production pipe column for blocking and blocking removal, recovering the drainage and gas production of the blocked well, and using two newly-built blocking removal wells for the production of coalbed methane.
Claims (5)
1. A method for reversely unblocking a coal-bed gas well by utilizing high-pressure gas is characterized by comprising the following steps of: the method comprises the following specific steps:
1) At least one unblocking well (2) for unblocking is established at a position 50-1000m away from the blocked well (1);
2) Respectively placing high-pressure oil pipes in a shaft for plugging the well (1) and unplugging the well (2) to serve as an air extraction pipe column and an air compression pipe column, enabling the air extraction pipe column and the air compression pipe column to abut against the coal bed (3) to serve as target layers, and then installing a wellhead and a ground pipeline;
3) After the connection of the air extraction pipeline and the air compression pipeline is completed, closing a wellhead valve of a plugged well (1) and an unplugged well (2), and checking the air tightness of a ground pipeline by using high-pressure air of 20MPa, wherein after the air compression is carried out for 5 minutes, if the pipeline pressure is still kept above 19MPa, the pressure measurement is qualified;
4) After the pressure measurement is qualified, opening an injection control valve of the unblocking well (2) and an annulus valve of the shaft, and then starting an air compressor to inject high-pressure gas into the unblocking well (2);
5) Stopping injecting after injecting the high-pressure gas for 48 hours, then opening a pumping control valve of the plugged well (1) and an annulus valve of the shaft, and controlling the opening of the valve to keep the gas flow rate at the wellhead of the plug removing well (2) at 200-600m 3 Between/min, coal dust particles (4) precipitated in a seepage channel of a plugged well (1) are carried out of cracks of a coal bed (3) under the action of gas pressure difference, then reach a wellhead of a plug removal well (2), and coal dust in wellhead gas is collected through a pumping system;
6) Along with the continuous injection of high-pressure gas into the coal seam (3) in the blocking removal well (2), the pulverized coal particles (4) blocked in the seepage passage of the blocking removal well (1) are gradually carried out, and when no pulverized coal is carried out in the gas flow at the wellhead of the blocking removal well (1), the gas compressing and gas extracting valves are closed to finish the blocking removal construction;
7) After the blocking removal work is finished, cleaning up massive solid phase particles remained at the bottom of the blocked well (1) through a bottom hole sand-bailing device, then, putting into a production pipe column for blocking the well (1) and blocking removal of the well (2), and recovering the drainage and gas production of the blocked well (1).
2. The method for reverse blocking removal of a coal-bed gas well by high-pressure gas according to claim 1, wherein: the blocking well (1) is any one of a vertical well, a horizontal well or a horizontal drilling hole.
3. The method for reverse blocking removal of a coal-bed gas well by high-pressure gas according to claim 1, wherein: for the vertical coal-bed gas well, at least one vertical blocking removing well (2) needs to be arranged in a single row when more than two blocking wells are arranged, the blocking wells are respectively positioned at two sides and around the blocking well (1), and the distance between the vertical wells is 50-1000m.
4. The method for reverse blocking removal of a coal-bed gas well by high-pressure gas according to claim 1, wherein: for the blocking well (1), for a horizontal coal bed gas well, when the number of the horizontal blocking removing wells (2) is one or two, the blocking removing wells (2) are required to be arranged in a single row and are respectively positioned at two sides of the blocking well (1), and the interval between the horizontal blocking removing wells (2) is 50-500m.
5. The method for reverse blocking removal of a coal-bed gas well by high-pressure gas according to claim 1, wherein: the high-pressure gas is any one of air, nitrogen and carbon dioxide.
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