CN106988707B - Layered pressure control combined drainage and mining device and method for double-coal-bed four-channel packer - Google Patents
Layered pressure control combined drainage and mining device and method for double-coal-bed four-channel packer Download PDFInfo
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- CN106988707B CN106988707B CN201710227604.3A CN201710227604A CN106988707B CN 106988707 B CN106988707 B CN 106988707B CN 201710227604 A CN201710227604 A CN 201710227604A CN 106988707 B CN106988707 B CN 106988707B
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- 238000005065 mining Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003245 coal Substances 0.000 claims abstract description 127
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 claims abstract description 90
- 230000000694 effects Effects 0.000 claims abstract description 21
- 238000000605 extraction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 210000002445 nipple Anatomy 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 238000002788 crimping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005406 washing 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
the invention relates to a drainage and mining device and method, belongs to the technical field of coal bed gas development, and particularly relates to a double-coal-bed four-channel packer layered pressure control combined drainage and mining device and method. According to the invention, the two coal beds are sealed in different pressure systems, the upper part of the upper coal bed liquid passing channel is connected with the liquid passing pipe, so that a certain liquid level depth can be maintained, and the upper coal bed is not exposed even if the liquid level of the shaft is reduced below the upper coal bed, so that the optimal gas production effect of the upper coal bed can be still ensured under the condition of ensuring the optimal gas production effect of the lower coal bed, the damage to the reservoir is reduced, and the interlayer interference in the double-coal-bed drainage process is reduced.
Description
Technical Field
the invention relates to a drainage and mining device and method, belongs to the technical field of coal bed gas development, and particularly relates to a coal bed gas well double-coal-bed four-channel packer layered pressure control combined drainage and mining device and method.
background
The method is characterized in that a combined-layer drainage mining mode is adopted in the current stage of double-coal-bed gas development, two pressure-control gas production periods exist in the double coal beds, after the pressure-control stable production period is started, if the time for the lower coal-bed gas to enter the pressure-control gas production period is seriously delayed in order to ensure the gas production effect of the upper coal bed, and similarly, in order to ensure the gas production effect of the lower coal bed, the liquid level depth is inevitably reduced below the upper coal bed, so that the upper coal bed is exposed. How to simultaneously control the reservoir pressure of two layers of coal through the drainage and mining process, reduce the reservoir damage, and simultaneously ensure the gas production effect of the two coal layers is a technical problem of double-coal-layer drainage and mining of a coal-bed gas well.
The patent No. 201310446063.5 discloses a double-casing single-pump layered pressure control and combined layer drainage and production technology and a device, which provides a double-coal-bed layered drainage and production method for a coal-bed gas well.
Therefore, in view of the defects, designers of the invention study and design a device and a method for combined drainage and production of the double-coal-bed four-channel packer by layers and pressure control by combining experience and results of long-term working in related industries through careful study and design so as to overcome the defects.
disclosure of Invention
The invention aims to provide a device and a method for layered pressure control combined drainage and production of a double-coal-seam four-channel packer of a coal-seam gas well, which are used for separating two coal seam sections in a shaft, effectively avoiding the complex interlayer interference effect generated when a vertical well is developed by the double coal seams and the drainage and production are performed by combining layers, solving the problem of layered pressure control of drainage and production of the double coal seams and improving the productivity of the gas well.
In order to solve the above problems, according to an aspect of the present invention, there is provided a dual-seam four-channel packer layered pressure control combined drainage and mining device, comprising:
the packer is provided with a main liquid production channel, a lower coal seam gas production channel and an upper coal seam liquid passing channel and is fixed on the oil pipe through the main liquid production channel;
the lower coal seam gas production pipe is connected with the lower coal seam gas production channel and is used for leading out gas in the lower coal seam;
and the lower end of the upper coal seam liquid passing pipe is connected with the upper coal seam liquid passing channel, and the upper end of the upper coal seam liquid passing pipe is positioned at the liquid level position of the upper coal seam when the optimal gas production effect is achieved and is used for communicating the liquid levels of the upper coal seam and the lower coal seam.
Preferably, the double-coal-bed four-channel packer layered pressure control combined drainage and mining device further comprises a drainage pipe, the upper end of the drainage pipe is connected with the upper coal-bed liquid passing channel through the upper coal-bed liquid passing channel, and the lower end of the drainage pipe is located in the lower coal bed.
Preferably, the bottom of the oil pipe is sequentially connected with the pump barrel, the sieve tube and the sand-settling tube, and a sucker rod connected with a plunger is arranged in the oil pipe.
preferably, the double-coal-bed four-channel packer layered pressure control combined discharge and production device is characterized in that a movable valve is arranged at one end, connected with the oil pipe, of the pump barrel, and a fixed valve is arranged at one end, connected with the sieve pipe, of the pump barrel.
preferably, the combined drainage and mining device with the layered pressure control function of the double-coal-bed four-channel packer further comprises a pressure gauge cable which is connected and sealed with the underground pressure gauge through a cable channel of the four-channel packer.
Preferably, the length of the upper coal seam liquid passing pipe is the sum of the distance from the upper coal seam to the packer and the distance of the liquid level from the packer to the upper coal seam when the optimal gas production effect is achieved.
Preferably, the double-coal-seam four-channel packer layered pressure control combined drainage and production device is characterized in that the length of the gas production pipe of the lower coal seam is greater than that of the liquid passing pipe of the upper coal seam.
In order to solve the problems, according to another aspect of the invention, a layered pressure control combined drainage and mining method for a double-seam four-channel packer is provided, which comprises the following steps:
step one, calculating reservoir pressure when the optimal gas production effect of the upper and lower coal seams is achieved, and converting the pressure value into liquid column height;
Connecting the packer to the oil pipe, wherein the packer is positioned between two coal beds and avoids the casing joint hoop; connecting the upper end of an upper coal seam liquid passing channel on the packer with an upper coal seam liquid passing pipe, and connecting the lower end of the upper coal seam liquid passing channel on the packer with a liquid discharging pipe; connecting the upper part of a gas production channel of a lower coal seam on a packer with a gas production pipe of the lower coal seam; the pressure gauge cable passes through a cable channel on the packer and then is fixed on a pressure gauge nipple on the upper part of the sieve tube and sealed;
thirdly, pressing and setting the packer through a well mouth after the pipe column and the packer are lowered to the designed depth;
and step four, installing a wellhead, starting a normal extraction program, monitoring pressure gauge data in real time, adjusting the liquid production amount in time after the liquid level is reduced to the top end of the liquid passing pipe, ensuring that the reading of the pressure gauge is stably and continuously reduced to the reservoir pressure when the optimal gas production effect of the lower coal seam is achieved, and then performing stable pressure drainage and extraction by adjusting the frequency of flushing.
From the above, the present invention has the following advantages:
(1) The two coal seams are sealed in two different pressure systems, the upper part of the upper coal seam liquid passing channel is connected with a liquid passing pipe, a certain liquid level depth can be kept, and even if the liquid level of a shaft is reduced below the upper coal seam, the upper coal seam is not exposed, so that the gas production of the upper coal seam can be still guaranteed under the condition of guaranteeing the gas production of the lower coal seam, the damage of a reservoir stratum is reduced, and the interlayer interference in the double-coal seam drainage and production process is reduced;
(2) The problem that the packer is displaced due to pressure fluctuation in the underground and the problems of coal bed coal dust deposition and sand spitting can be effectively solved, and the probability of underground accidents is reduced.
drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a cross-sectional view of a four-pass packer;
In fig. 1: 1. the coal layer production device comprises a sucker rod, 2 oil pipes, 3 casing pipes, 4 pressure gauge cables, 5 upper coal layer liquid passing pipes, 6 lower coal layer gas production pipes, 7 upper coal layers, 8 four-channel packers, 9 lower coal layers, 10 plungers, 11 movable valves, 12 pump cylinders, 13 fixed valves, 14 pressure gauges, 15 screen pipes, 16 sand settling pipes, 17 upper coal layer liquid passing channels, 18 lower coal layer gas production channels, 19 main liquid production channels, 20 electric cable passing channels, 21 liquid discharge pipes, 22 telescopic pipes, 23 safety connectors and 24 circulating valves.
Detailed Description
referring to fig. 1-2, a coal-bed gas well dual-coal-bed four-channel packer layered pressure control combined drainage and production device is shown, which comprises oil production pipes 2, 12, 15, 16, a four-channel packer 8, a pressure gauge cable 4, a lower coal-bed gas production pipe 6 and an upper coal-bed liquid passing pipe 5, and is characterized in that:
The oil production pipe comprises an oil pipe 2, a pump barrel 12, a sieve pipe 15 and a sand setting pipe 16, and other types of oil production pipes can be selected, such as a hydraulic rodless oil production pipe, a jet pump pipe and a hydraulic piston pump pipe.
The four-channel packer 8 is connected with the oil production string 2 through the upper and lower threads of the main production fluid channel 19.
The four-channel packer 8 comprises a main liquid production channel 19, a lower coal seam gas production channel 18, an upper coal seam liquid passing channel 17 and a cable passing channel 20 which are arranged in parallel.
the packer 5 is pressed by the oil production string 2 through a ground high-pressure pump to be set and unset, and the setting and unsetting principle is similar to that of a Y344 type packer.
The gauge cable 4 is connected and sealed to the downhole gauge 14 by the over-cable passage 20 of the four-way packer 8.
wherein, cross cable channel 20 and pressure gauge cable 4 and seal through packing nut and packing, also can seal through other modes such as glass glues.
The gas production pipe 6 of the lower coal seam is connected with the reserved thread at the upper end of the gas production channel 18 of the lower coal seam of the four-channel packer 8, and can also be connected with other connection modes such as reserved pipe crimping and the like.
Wherein, the length of the gas production pipe 6 of the lower coal seam is longer than that of the liquid passing pipe 5 of the upper coal seam, and the gas production pipe is fixed on the oil pipe column 2 by a centralizer or a steel belt and is kept relatively fixed with the oil pipe column 2.
the upper coal seam liquid passing pipe 5 is connected with the reserved threads at the upper end of the upper coal seam liquid passing channel 17 through the four-channel packer 8 and can also be connected with other connection modes such as reserved pipe crimping and the like.
The length of the upper coal seam liquid passing pipe 5 is the distance from the upper coal seam 7 to the packer 8 and the liquid level height of the upper coal seam 7 under the optimal gas production effect, and the upper coal seam liquid passing pipe is fixed on the oil pipe column 2 by a centralizer or a steel belt and is kept relatively fixed with the oil pipe column 2.
Through the layered pressure control combined discharge and mining device of the double-coal-bed four-channel packer, the layered pressure control combined discharge and mining method of the double-coal-bed four-channel packer comprises the following steps:
Step one, calculating reservoir pressure of the upper and lower coal seams 7 and 9 under the optimal gas production effect through numerical simulation or early-stage drainage and production data, and converting the reservoir pressure into liquid column heights a and b;
step two, connecting a four-channel packer 8 to an oil pipe 2, connecting the upper part of a main liquid production channel 19 with the oil pipe 2, an extension pipe 22, a safety joint 23 and a circulating valve 24, and connecting the lower part of the main liquid production channel with the oil pipe 2, a pump cylinder 12, a sieve pipe 15 and a sand settling pipe 16, wherein the packer 8 is positioned between two coal seams 7 and 9 and avoids a casing joint hoop; the upper end of the upper coal seam liquid passing channel 17 is connected with a liquid passing pipe 5, the liquid passing pipe 5 is fixed on an oil pipe 2 through a centralizer or a steel belt, the length of the liquid passing pipe 5 is the liquid level a + the distance from a packer to the upper coal seam when the optimal gas production effect of the upper coal seam 7 is achieved, the lower end of the upper coal seam liquid passing channel 17 is connected with a liquid discharge pipe 21, the liquid discharge pipe 21 is fixed on the oil pipe 2 through the centralizer or the steel belt, and the length of the liquid discharge pipe 21 is larger than the distance from the lower coal seam to the packer-the liquid level b when the optimal; the upper part of the gas production channel 18 of the lower coal seam is connected with a gas production pipe 6 of the lower coal seam, the gas production pipe 6 of the lower coal seam is fixed on the oil pipe 2 through a centralizer or a steel belt, the length of the gas production pipe is 2-3 meters longer than the liquid passing pipe, and the gas production pipe can also be directly extended to the ground for metering; the pressure gauge cable 4 passes through the cable channel 20 and then is fixed on a pressure gauge short joint at the upper part of the sieve tube 15, and the upper and lower openings of the cable channel 20 are sealed.
Thirdly, after the pipe column and the packer 8 are lowered to the designed depth, the setting packer 8 is pressed through a well mouth;
And step four, installing a wellhead, starting a normal extraction program, monitoring data of the pressure gauge 14 in real time, adjusting the liquid production amount in time after the liquid level is reduced to the top end of the upper coal seam liquid passing pipe 5, ensuring that the reading of the pressure gauge is stably and continuously reduced to the reservoir pressure when the optimal gas production effect of the lower coal seam 9 is achieved, and then performing stable-pressure drainage and extraction by adjusting the stroke frequency.
after the structure and the method are adopted, the two coal seams are sealed and separated in different pressure systems, the upper part of the upper coal seam liquid passing channel is connected with the liquid passing pipe, a certain liquid level depth can be kept, and even if the liquid level of the shaft is reduced below the upper coal seam, the upper coal seam cannot be exposed, so that the gas production of the upper coal seam can be still ensured under the condition of ensuring the gas production of the lower coal seam, the damage of the reservoir is reduced, and the interlayer interference in the double-coal seam drainage and production process is reduced.
In the present embodiment, the oil pipe 2 is provided with a telescopic pipe 22. If pressure fluctuation exists underground and acts on the packer 8, the packer 8 can be displaced, and the telescopic pipe 22 can effectively solve the problem; in this embodiment, the circulation valve 24 is disposed on the oil pipe 2 to avoid that the upper coal seam is deposited on the packer during the production process to make the string unable to be pulled out after the packer 8 is unsealed. At the moment, the well can be washed through the circulating valve 24, and sediment is returned out of the wellhead, so that the pipe column is pulled out; if the pipe column is still blocked after the well washing operation and cannot be normally lifted out, the pipe column can be lifted up until the safety joint 23 sets tension, the safety joint 23 is released, tools below the safety joint 23 are left in the well, the pipe column above the safety joint 23 can be smoothly lifted out, and then the remaining pipe columns and the tools are salvaged or drilled and milled, so that the probability of underground accidents is reduced, and a processing scheme is provided.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (8)
1. The utility model provides a device is adopted to two coal seams four-channel packer layering accuse pressure joint row which characterized in that includes:
The packer (8) is provided with a main liquid production channel (19), a lower coal bed gas production channel (18) and an upper coal bed liquid passing channel (17) and is fixed on the oil pipe (2) through the main liquid production channel (19);
The lower coal seam gas production pipe (6) is connected with the lower coal seam gas production channel (18) and is used for guiding out gas in the lower coal seam;
The lower end of the upper coal seam liquid passing pipe (5) is connected with the upper coal seam liquid passing channel (17), and the upper end of the upper coal seam liquid passing pipe is positioned at the liquid level position of the upper coal seam when the optimal gas production effect is achieved and is used for communicating the liquid levels of the upper coal seam and the lower coal seam;
The lower end of the upper coal seam liquid passing channel (17) is connected with a liquid drainage pipe (21), and the length of the liquid drainage pipe (21) is greater than the distance from the lower coal seam to the packer-the liquid level height b of the lower coal seam when the optimal gas production effect is achieved.
2. The device for layered pressure control combined drainage and production of the double-coal-seam four-channel packer as claimed in claim 1, further comprising a drainage pipe (21) with the upper end connected with the liquid passing pipe (5) through the upper coal-seam liquid passing channel (17), wherein the lower end of the drainage pipe (21) is positioned in the lower coal seam.
3. the combined drainage and production device of the double-coal-seam four-channel packer with the separate layers and the pressure control as claimed in claim 1, wherein the bottom of the oil pipe (2) is sequentially connected with a pump barrel (12), a sieve pipe (15) and a sand-settling pipe (16), and a sucker rod (1) connected with a plunger (10) is arranged in the oil pipe.
4. The combined drainage and production device of claim 3, wherein a movable valve (11) is arranged at one end of the pump barrel (12) connected with the oil pipe (2), and a fixed valve (13) is arranged at one end connected with the sieve tube (15).
5. The combined drainage and production device with the layered pressure control of the double-coal-seam four-channel packer as claimed in claim 1, further comprising a pressure gauge cable (4) which is connected with and sealed with a downhole pressure gauge (14) through a cable channel (20) of the four-channel packer (8).
6. The device for layered pressure control and combined drainage and production of the double-coal-seam four-channel packer as claimed in claim 1, wherein the length of the upper coal-seam liquid passing pipe (5) is the sum of the distance from the upper coal seam (7) to the packer (8) and the distance of the liquid level when the upper coal seam (7) has the best gas production effect.
7. the device for layered pressure control and combined drainage and production of the double-coal-bed four-channel packer as claimed in claim 1, wherein the length of the lower coal-bed gas production pipe (6) is greater than that of the upper coal-bed liquid through pipe (5).
8. A layered pressure control combined drainage and mining method for a double-coal-bed four-channel packer is characterized by comprising the following steps:
Step one, calculating reservoir pressure when the upper coal seam and the lower coal seam have the best gas production effect, and converting the pressure value into liquid column height;
Connecting the packer to the oil pipe, wherein the packer is positioned between two coal beds and avoids the casing joint hoop; connecting the upper end of an upper coal seam liquid passing channel on the packer with an upper coal seam liquid passing pipe, and connecting the lower end of the upper coal seam liquid passing channel on the packer with a liquid discharging pipe; connecting the upper part of a gas production channel of a lower coal seam on a packer with a gas production pipe of the lower coal seam; the pressure gauge cable passes through a cable channel on the packer and then is fixed on a pressure gauge nipple on the upper part of the sieve tube and sealed;
Thirdly, pressing and setting the packer through a well mouth after the pipe column and the packer are lowered to the designed depth;
step four, installing a wellhead, starting a normal extraction program, monitoring pressure gauge data in real time, adjusting the liquid production amount in time after the liquid level is reduced to the top end of the liquid passing pipe, ensuring that the reading of the pressure gauge is stably and continuously reduced to the reservoir pressure when the optimal gas production effect of the lower coal seam is achieved, and then performing stable pressure drainage and extraction by adjusting the frequency of flushing;
the lower end of the upper coal seam liquid passing pipe (5) is connected with the upper coal seam liquid passing channel (17), and the upper end of the upper coal seam liquid passing pipe is positioned at the liquid level position of the upper coal seam when the optimal gas production effect is achieved and is used for communicating the liquid levels of the upper coal seam and the lower coal seam;
the lower end of the upper coal seam liquid passing channel (17) is connected with a liquid drainage pipe (21), and the length of the liquid drainage pipe (21) is greater than the distance from the lower coal seam to the packer-the liquid level height b when the lower coal seam has the best gas production effect.
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| CN113550720B (en) * | 2021-09-23 | 2021-12-21 | 中煤科工集团西安研究院有限公司 | Multi-source coal-based gas layered pressure control independent metering drainage and mining device and method |
| CN114575792A (en) * | 2022-03-11 | 2022-06-03 | 中煤科工集团重庆研究院有限公司 | Coal seam group gas combined extraction traceability metering method |
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| CN106988707A (en) | 2017-07-28 |
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