CN114575789A - Coal bed gas long-stop well re-production mechanical liquid drainage system - Google Patents
Coal bed gas long-stop well re-production mechanical liquid drainage system Download PDFInfo
- Publication number
- CN114575789A CN114575789A CN202011383452.4A CN202011383452A CN114575789A CN 114575789 A CN114575789 A CN 114575789A CN 202011383452 A CN202011383452 A CN 202011383452A CN 114575789 A CN114575789 A CN 114575789A
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- Prior art keywords
- casing
- drainage system
- coal bed
- well
- pump
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003245 coal Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 239000010865 sewage Substances 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 claims abstract description 14
- 239000003129 oil well Substances 0.000 claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 7
- 230000007774 longterm Effects 0.000 claims description 5
- 238000000605 extraction Methods 0.000 abstract description 11
- 230000009471 action Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000006378 damage Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
Abstract
The invention provides a coal bed gas long-stop well re-production mechanical liquid drainage system, which comprises: the casing pump is arranged in the oil well casing along the vertical direction and can slide up and down along the oil well casing; the hydraulic blowout prevention mechanism is arranged at the upper end of the oil well casing, and the upper end of the casing swab can penetrate through the hydraulic blowout prevention mechanism and slide up and down; and the rotary stirrer is arranged at the lower end of the casing pipe drawer and can rotate relative to the casing pipe drawer. The invention has the advantages that the rotary stirrer is arranged, so that the submergence degree of the casing pipe pump in coal slime and/or sewage can be increased, the coal slime extraction degree is improved, and the purpose of efficient drainage and extraction is achieved.
Description
Technical Field
The invention relates to the technical field of development of coal bed gas in a coal bed gas field, in particular to a coal bed gas long-term shut-in well complex production mechanical liquid drainage system.
Background
Coal-bed gas wells are nearly twenty thousand in number, but 30% to 40% have been shut down. And the coal bed gas of the shut-down coal bed gas well is produced mainly by desorption, along with the production of coal bed water and coal slime, if the coal bed gas is accumulated due to the failure of timely drainage and production, the continuous production of the coal bed gas is prevented, and therefore drainage and production are needed. The problems of low operation efficiency, short pump detection period and high energy consumption caused by the problem that the conventional rod-type oil well pump, screw pump, electric submersible pump and the like are blocked by coal slime can be solved, and the coal bed gas well mining device can not be suitable for economic and effective mining of a coal bed gas well.
Disclosure of Invention
The invention provides a coal bed gas long-stop well re-production mechanical liquid drainage system, which aims to achieve the purpose of efficient drainage and mining.
The technical scheme adopted by the invention for solving the technical problems is as follows: a coal bed gas long shut-in well recovery machinery drainage system, includes: the casing pump is arranged in the oil well casing along the vertical direction and can slide up and down along the oil well casing; the hydraulic blowout prevention mechanism is arranged at the upper end of the oil well casing, and the upper end of the casing swab can penetrate through the hydraulic blowout prevention mechanism and slide up and down; and the rotary stirrer is arranged at the lower end of the casing pipe drawer and can rotate relative to the casing pipe drawer.
Furthermore, the coal bed gas long-stop well re-production mechanical drainage system further comprises a remote control pump which is connected with the side wall of the upper end of the hydraulic blowout prevention mechanism and can control the liquid pressure in the hydraulic blowout prevention mechanism.
Furthermore, a liquid discharge port for discharging liquid is arranged on the side wall of the lower end of the hydraulic blowout prevention mechanism.
Furthermore, the coal bed gas long-stop well complex production mechanical liquid discharge system further comprises a sewage tank truck, and an inlet of the sewage tank truck can be connected with a liquid discharge port.
Furthermore, the coal bed gas long shut-in well re-production mechanical drainage system further comprises a weighting rod which is arranged at the lower end of the casing pump, and the rotary stirrer is arranged at the lower end of the weighting rod.
Furthermore, the coal bed gas long shut-down well re-production mechanical drainage system also comprises a power swabbing truck, wherein the power swabbing truck is provided with a rope capable of lifting, and the lower end of the rope is connected with the upper end of the casing pipe swab.
Furthermore, the rotary stirrer is of a conical structure, the large-diameter end of the conical structure is connected with the lower end of the sleeve puller, and the small-diameter end of the conical structure is located below the large-diameter end of the conical structure.
Further, the outer wall of the conical structure is provided with a plurality of spiral guide grooves which are arranged at intervals.
Furthermore, the coal bed gas long shut-in well re-production mechanical liquid drainage system further comprises a driving assembly, the driving assembly is arranged at the upper end of the conical structure and connected with the lower end of the casing pump, and the driving assembly can drive the conical structure to rotate relative to the casing pump.
Furthermore, the driving component is a driving motor, and a power line of the driving motor is arranged in the casing pipe drawer and is connected with a ground power supply device.
The invention has the advantages that the rotary stirrer is arranged, so that the submergence degree of the casing pipe pump in coal slime and/or sewage can be increased, the coal slime extraction degree is improved, and the purpose of efficient drainage and extraction is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic view of the connection of the embodiment of the present invention to a sewage tanker and a power swabbing truck.
Reference numbers in the figures: 1. remotely controlling the pump; 2. a power swabbing truck; 3. a hydraulic blowout prevention mechanism; 4. a casing swab; 5. a weight bar; 6. rotating the stirrer; 7. a sewage tank truck.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, an embodiment of the invention provides a drainage system of a coal bed methane long shut-in well complex production machine, which comprises a casing pump 4, a hydraulic blowout prevention mechanism 3 and a rotary stirrer 6. The casing swab 4 is arranged in the oil well casing in the vertical direction and can slide up and down along the oil well casing. The hydraulic blowout preventer 3 is arranged at the upper end of an oil well casing, and the upper end of the casing swab 4 can penetrate through the hydraulic blowout preventer 3 and slide up and down. The rotary stirrer 6 is provided at the lower end of the casing drawer 4 and is capable of rotating relative to the casing drawer 4.
The rotary stirrer 6 is arranged, so that the submergence degree of the sleeve pipe pump 4 in coal slime and/or sewage can be increased, the coal slime extraction degree is improved, and the purpose of efficient drainage and extraction is achieved.
Please refer to chinese patent application with publication number CN202117611U for the structure of the hydraulic blowout preventing mechanism 3, and the detailed description thereof is omitted here.
Furthermore, the coal bed gas long-term shutdown well re-production mechanical liquid drainage system further comprises a remote control pump 1 which is connected with the side wall of the upper end of the hydraulic blowout prevention mechanism 3 and can control the liquid pressure in the hydraulic blowout prevention mechanism 3. The remote control pump 1 includes a pump body and a control element for controlling the pump body, the pump body is connected to the hydraulic blowout preventer 3, and the control element is electrically connected to the pump body.
The remote control pump 1 and the hydraulic blowout prevention mechanism 3 can be used for ensuring the pumping and fishing operation to be safe and environment-friendly, and the pumping and fishing liquid is prevented from being jetted out from a wellhead.
As shown in fig. 2, a drain port for draining liquid is provided in a lower end side wall of the hydraulic blowout preventer 3. The liquid outlet can be used for leading out pumped and fished liquid.
Further, the coal bed gas long-stop well complex production mechanical liquid discharge system further comprises a sewage tank truck 7, and an inlet of the sewage tank truck 7 can be connected with a liquid discharge port. The sewage tank truck 7 can timely convey pumped liquid to a set position, and the operation efficiency can be improved through alternate operation of a plurality of sewage tank trucks 7.
As shown in fig. 1, the drainage system of the coal bed methane long shut-in well complex production machinery in the embodiment further includes a weighting rod 5 disposed at the lower end of the casing pump 4, and a rotary agitator 6 disposed at the lower end of the weighting rod 5. The arrangement of the weighting rod 5 can increase the submergence degree of the casing pipe pump 4 in coal slime and/or sewage, improve the coal slime extraction degree and achieve the purpose of efficient drainage and extraction.
As shown in fig. 2, the coal bed methane long shut-in well complex production mechanical drainage system further comprises a power pumping vehicle 2, which is provided with a rope capable of lifting, and the lower end of the rope is connected with the upper end of the casing pump 4. The power pumping vehicle 2 is used for providing power for the underground casing pump 4 and achieving the purpose of reciprocating motion of the casing pump 4.
The drawing and fishing operation through the casing pipe drawer 4 has the following functions:
purification effect: in the construction process, under the action of continuous alternating pressure, a 'water hammer' phenomenon can be generated in a water flow channel, trapped fluid quickly rushes to a well cavity under the action of negative pressure, deposits on the wall of the sleeve are effectively degraded, channel plugs of a perforation part are dredged, and under the action of instant negative pressure, a medium squeezed into the oil flow channel is enabled to completely flow into a shaft and then is discharged to the ground, so that the purposes of purifying a seepage flow channel and removing the blockage of an eyelet are achieved.
The blockage removal effect is as follows: under the action of strong negative pressure, the production pressure difference is greatly and quickly amplified to lead the plugs in the pores to be brought out by liquid flow, thereby reducing the pressing force on the bedrock in the pore space, being more beneficial to leading the dispersed phase to flow from the gas layer to the well cavity, realizing the cleaning of the stratum and relieving various particle blockage in the near-well area of the oil layer.
Expelling action: coal ash, coal slime and residual water blocking the stratum are discharged under the action of periodic negative pressure; and the particles blocking the stratum are pushed to narrow channels and expansion positions in cracks and pores under the action of positive and negative direction loads, so that the particles are broken away from the original positions, and the flowability of the fluid is enhanced.
Meanwhile, the embodiment of the invention can also control the blockage removing parameters: according to the actual drainage and production of the coal bed gas, a coal bed gas well gas production channel, a near wellbore area and a far wellbore area pulverized coal destruction model are established based on a coal rock pulverized coal destruction mechanism. Analysis shows that the near well zone is mainly compaction damage caused by large depressurization degree, and the near well zone and the far well zone are mainly tensile damage caused by fluid dragging, so that the critical extraction parameters of the pulverized coal generated by the gas generation channel are given. And (3) establishing a bottom pressure and water yield model of the coal bed gas single-well multi-layer commingled production by combining a shaft pressure distribution model, and analyzing and determining the bottom pressure and the water discharge of the single-well multi-layer commingled production well, preferably selecting the optimal blockage relieving negative pressure parameter.
As shown in fig. 1, the rotary stirrer 6 has a conical structure, a large diameter end of the conical structure is connected with the lower end of the sleeve pump 4, and a small diameter end of the conical structure is located below the large diameter end of the conical structure. The outer wall of the conical structure is provided with a plurality of spiral guide grooves which are arranged at intervals.
This rotary agitator 6 can rotate for the lower extreme of sleeve pipe swab 4 to the effect of stirring is carried out to coal ash, coal slime, residual water that block up the stratum to the realization reaches the purpose that improves drainage and mining efficiency.
Preferably, the mechanical drainage system for coal bed methane long stop well production recovery further comprises a driving assembly, the driving assembly is arranged at the upper end of the conical structure and connected with the lower end of the casing pump 4, and the driving assembly can drive the conical structure to rotate relative to the casing pump 4. The driving assembly is arranged, so that the conical structure can rotate automatically under the action of the driving assembly, and the driving assemblies with different powers can be selected according to different working conditions, so that the problems of energy waste or unsatisfactory stirring efficiency are avoided.
The driving component in this embodiment may be a driving motor, and a power line of the driving motor is disposed in the casing drawer 4 and connected to a ground power supply device. The driving motor is only an embodiment of the present invention, and other driving components may be selected according to different needs to drive the rotary agitator 6, which is not limited in this embodiment, but all driving components meeting the above definition should be within the scope of the present application.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the rotary stirrer 6 is arranged, so that the submergence degree of the sleeve pipe pump 4 in coal slime and/or sewage can be increased, the coal slime extraction degree is improved, and the purpose of efficient drainage and extraction is achieved.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (10)
1. The utility model provides a mechanical flowing back system of coalbed methane long stop well reproduction which characterized in that includes:
the casing pump (4) is arranged in the oil well casing in the vertical direction and can slide up and down along the oil well casing;
the hydraulic blowout prevention mechanism (3) is arranged at the upper end of the oil well casing, and the upper end of the casing pump (4) can penetrate through the hydraulic blowout prevention mechanism (3) and slide up and down;
and the rotary stirrer (6) is arranged at the lower end of the casing pipe drawer (4) and can rotate relative to the casing pipe drawer (4).
2. The mechanical drainage system for long-term shutdown of coal bed methane well recovery according to claim 1, further comprising a remote control pump (1) connected to the upper side wall of the hydraulic blowout preventer (3) and capable of controlling the pressure of the liquid in the hydraulic blowout preventer (3).
3. The mechanical drainage system for long-stop coal bed methane well recovery according to claim 1, wherein a drainage port for draining liquid is arranged on the side wall of the lower end of the hydraulic blowout preventing mechanism (3).
4. The coal bed gas long stop well complex production mechanical drainage system according to claim 3, further comprising a sewage tank truck (7), wherein an inlet of the sewage tank truck (7) can be connected with the drainage port.
5. The mechanical drainage system of coal bed methane long stop well complex production according to claim 1, characterized in that the mechanical drainage system of coal bed methane long stop well complex production further comprises a weighting rod (5) arranged at the lower end of the casing pump (4), and the rotary stirrer (6) is arranged at the lower end of the weighting rod (5).
6. The mechanical drainage system of coalbed methane long stop well complex production, as recited in claim 1, characterized in that the mechanical drainage system of coalbed methane long stop well complex production further comprises a power-driven swabbing truck (2) having a rope capable of being lifted, the lower end of the rope being connected with the upper end of the casing swab (4).
7. The mechanical drainage system for coal bed methane long stop well production recovery according to claim 1, wherein the rotary stirrer (6) is of a cone-shaped structure, the large diameter end of the cone-shaped structure is connected with the lower end of the casing pipe puller (4), and the small diameter end of the cone-shaped structure is positioned below the large diameter end of the cone-shaped structure.
8. The mechanical drainage system for long-term shutdown of coal bed methane production recovery of claim 7, wherein the outer wall of the conical structure is provided with a plurality of spaced spiral guide grooves.
9. The mechanical drainage system of coalbed methane long stop well complex production, according to claim 7, further comprises a driving component, which is arranged at the upper end of the cone-shaped structure and connected with the lower end of the casing pump (4), and the driving component can drive the cone-shaped structure to rotate relative to the casing pump (4).
10. The mechanical drainage system for long-term shutdown of coal bed methane well production recovery of claim 9, wherein the driving component is a driving motor, and a power line of the driving motor is arranged in the casing pump (4) and is connected with a ground power supply device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383452.4A CN114575789A (en) | 2020-12-01 | 2020-12-01 | Coal bed gas long-stop well re-production mechanical liquid drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383452.4A CN114575789A (en) | 2020-12-01 | 2020-12-01 | Coal bed gas long-stop well re-production mechanical liquid drainage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114575789A true CN114575789A (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011383452.4A Pending CN114575789A (en) | 2020-12-01 | 2020-12-01 | Coal bed gas long-stop well re-production mechanical liquid drainage system |
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| CN (1) | CN114575789A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080066920A1 (en) * | 2006-09-15 | 2008-03-20 | Marc Allcorn | Providing a cleaning tool having a coiled tubing and an electrical pump assembly for cleaning a well |
| CN102373908A (en) * | 2011-10-08 | 2012-03-14 | 龚大建 | Underground ultrasonic yield-increasing pumping device for coalseam gas |
| CN202249957U (en) * | 2011-09-28 | 2012-05-30 | 刘昌进 | Coal powder spiral anti-blocking device |
| CN103388466A (en) * | 2012-05-10 | 2013-11-13 | 中国石油大学(华东) | Concentric pipe hydraulic jet coal dust washing downhole device |
| CN109252820A (en) * | 2018-10-24 | 2019-01-22 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of method of the efficient row's of the returning coal dust of coal bed gas well |
| 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 |
-
2020
- 2020-12-01 CN CN202011383452.4A patent/CN114575789A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080066920A1 (en) * | 2006-09-15 | 2008-03-20 | Marc Allcorn | Providing a cleaning tool having a coiled tubing and an electrical pump assembly for cleaning a well |
| CN202249957U (en) * | 2011-09-28 | 2012-05-30 | 刘昌进 | Coal powder spiral anti-blocking device |
| CN102373908A (en) * | 2011-10-08 | 2012-03-14 | 龚大建 | Underground ultrasonic yield-increasing pumping device for coalseam gas |
| CN103388466A (en) * | 2012-05-10 | 2013-11-13 | 中国石油大学(华东) | Concentric pipe hydraulic jet coal dust washing downhole device |
| 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 |
| CN109252820A (en) * | 2018-10-24 | 2019-01-22 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of method of the efficient row's of the returning coal dust of coal bed gas well |
Non-Patent Citations (1)
| Title |
|---|
| 宗美巧等: "一种PLC控制的深井抽汲机研制及应用", 石油矿场机械, vol. 42, no. 06, 30 June 2013 (2013-06-30), pages 72 - 75 * |
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