CN102434135A - Multi-layer discharge and mining device for multiple seam developed area - Google Patents
Multi-layer discharge and mining device for multiple seam developed area Download PDFInfo
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- CN102434135A CN102434135A CN2011103947692A CN201110394769A CN102434135A CN 102434135 A CN102434135 A CN 102434135A CN 2011103947692 A CN2011103947692 A CN 2011103947692A CN 201110394769 A CN201110394769 A CN 201110394769A CN 102434135 A CN102434135 A CN 102434135A
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Abstract
The invention discloses a multi-layer discharge and mining device for a multiple seam developed area, which comprises an additional casing, the outer ring of the upper part of the additional casing is provided with a plugging part, the wall of the additional casing on the lower side of the plugging part is provided with a drain hole, the outer ring of the additional casing on the lower side of the drain hole is provided with a first packer, and the additional casing is provided with an elastic cushion for covering the drain hole. The invention aims at the large difference of stratum liquid feed capacity of multiple seam during the multi-layer discharge and mining of a multiple seam developed area, when the existing discharge and mining device is used to discharge and mine, the pressure is difficult to control, which can cause permeability to be sharply reduced so as to result in large reduction on gas production rate, with the multi-layer discharge and mining device for the multiple seam developed area disclosed by the invention, pressure of the multiple seam can be stably reduced, the reasonable and effective multi-layer discharge and mining can be realized, and the goal of stable and continuous of gas production and high yield can be achieved.
Description
Technical field
The present invention relates to a kind of multiple seam grows the district and closes layer row and adopt equipment.
Background technology
China's most of areas is generally grown multiple seam; In the area that multiple seam is grown, only carry out the exploitation of coal bed gas ground with individual layer, investment risk is big; In order to reduce the exploration and development cost; In the zone that multiple seam is grown, many coal bed gas company has taked all to drill a plurality of coal seams, uses screw pump, electric submersible pump or beam pump to reach the purpose that the multilayer coal is united aerogenesis through the water that row adopts in the multilayer coal.The enforcement multiple seam is closed layer and is arranged when adopting, and because of they " share " pit shaft, the speed that pressure transmits in the water pumping gas production process is very big to the influence of aerogenesis speed; If one deck coal aerogenesis speed is very fast; Certainly will cause moving of coal dust or proppant, moving of coal dust or proppant can cause that coal seam reservoirs crack passage stops up; The crack passage stops up, and can influence the pressure transmission and then influence gas production.When therefore, how to guarantee the multiple seam aerogenesis pressure transmission speed be continue, stablize, the key of high yield.Behind the aerogenesis, the speed speed of pressure transmission be controlled by on the one hand coal seam itself permeability, country rock and coal seam the property of water-bearing and get in touch tightness degree etc., and these factors are objective reality, almost can't change; Be controlled by on the other hand and arrange pressure drop when adopting, pressure drop is to be determined jointly by stratum fluid supply capacity and two aspects of drainability that row adopts equipment.At present, the multilayer coal closes layer row when adopting, because of it " shares " same pit shaft; Adopt equipment with present row and arrange when adopting, the producing fluid level of multilayer coal is identical, when the fluid supply capacity otherness of multilayer coal obviously the time; Certainly will cause the transmission of one deck coal pressure fast; The transmission of another layer coal pressure is slow, then possibly cause one deck coal pressure excited, influences the aerogenesis effect greatly.Inconsistent to the multiple seam pressure system; Stratum feed flow otherness is big; Adopt equipment with present row and arrange and adopt, exciting serious, the coal dust of the coal seam pressure that causes, proppant move frequently, have a strong impact on the fact of aerogenesis effect, develop a kind of multiple seam and close layer and arrange a pressure system adjusting device of adopting; Be to carry out multiple seam to close layer row and adopt in this type area, improve stable, continue, the key of high yield.
Summary of the invention
The objective of the invention is to grow the district to multiple seam and close layer row when adopting, the stratum fluid supply capacity otherness of multilayer coal is big, and present row adopts equipment and arranges and adopt; Pressure is difficult to control; Possibly cause the fact that permeability sharply descends and then causes gas production to significantly reduce, provide a kind of multiple seam growth district to close layer row and adopt equipment, realize that multiple seam pressure steadily reduces; Close layer row rationally, efficiently and adopt, reach aerogenesis steadily, continue, aim of high yield.
For realizing above-mentioned purpose; The present invention adopts following technical scheme: close layer row and adopt equipment in a kind of multiple seam growth district; Comprise further sleeve, the outer ring, top of further sleeve is provided with closeouts, and the further sleeve tube wall of closeouts downside is provided with the discharge orifice; The further sleeve outer ring of discharge orifice downside is provided with first packer, and further sleeve is provided with the cushion that covers the discharge orifice.
Further sleeve outer ring fixed cover is provided with production casing; Closeouts is plugged between further sleeve and the production casing; Be provided with centralizer between further sleeve and the production casing; Production casing is provided with between water inlet or production casing bottom and the further sleeve outer tube wall and is provided with water inlet, and water inlet is between the discharge orifice and first packer.
Be equipped with pressure gauge on the tube wall of the further sleeve of the said oil-pipe external wall and the first packer upside, pressure gauge is connected with the Computer signal acquisition system through cable.
Said further sleeve is divided into two sections; Closeouts, first packer are arranged at the further sleeve epimere up and down; In the outer ring of further sleeve hypomere second packer accessory and the 3rd packer accessory are set up and down; Be fixedly connected with tube connector between upper and lower section of the further sleeve, further sleeve epimere tube wall is provided with the connecting hole that is positioned at the second packer accessory upside, and further sleeve hypomere tube wall is provided with the connecting hole that is positioned at the 3rd packer accessory downside; Said tube connector one end connects the connecting hole of further sleeve epimere, and the tube connector other end connects the connecting hole of further sleeve hypomere.
Further sleeve epimere outer ring fixed cover is provided with production casing, is provided with centralizer between further sleeve and the production casing, and closeouts is between further sleeve and production casing, and first packer accessory is plugged between the bottom of further sleeve and production casing.
Be equipped with pressure gauge on the tube wall of the further sleeve hypomere on the said oil-pipe external wall and between second and third packer, pressure gauge is connected with the Computer signal acquisition system through cable.
Said first packer, second packer and the 3rd packer are the rubber bag tank of annular, and rubber bag tank is wrapped in the canvas net, and rubber bag tank is connected with high-pressure pump through pneumatic circuit.
Said cushion is a rubber pad, is provided with the bar shaped angle bar of compacting rubber pad in the border of discharge orifice, and steel plate, rubber pad and further sleeve are nailed together through bolt.
Dewatering installation is set in the further sleeve.
Multiple seam of the present invention is grown the district and is closed layer row and adopt equipment, is applicable to that multiple seam develops simultaneously, only need each payzone is in the different pressure systems through the multilayer further sleeve, will not disturb mutually like this.It has the following advantages: 1. efficiently solve that to store the fluid supply capacity diversity ratios bigger is more, it is bigger to adopt conventional row to adopt the Equipment Control difficulty, possibly cause the permeability heavy damage and then cause gas production to significantly reduce, and can not close the difficult problem that layer row adopts.2. further sleeve has been carried out packing effectively, made it form two pressure systems, when row adopts, do not disturbed mutually.3. it is poor effectively to have controlled liquid level, and when the liquid level difference reached certain value, rubber pad broke automatically, and two-layer product water can be discharged through an oil pipe.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the structural representation of rubber pad;
Fig. 3 is the structural representation of the embodiment of the invention 2;
Fig. 4 is the structural representation of the embodiment of the invention 3.
The specific embodiment
Embodiment 1:
Close layer row by a kind of multiple seam growth district illustrated in figures 1 and 2 and adopt equipment, comprise the further sleeve 13 of set inside dewatering installation, further sleeve 13 outer ring fixed covers are provided with production casing 12; Be arranged with surface pipe 11 in outer ring, production casing 12 top; Further sleeve 13, production casing 12 and surface pipe 11 are vertical setting, and the outer ring, top of further sleeve 13 is provided with closeouts 22, and closeouts 22 is plugged between the top of top and production casing 12 of further sleeve 13; Further sleeve 13 tube walls of closeouts 22 downsides are provided with discharge orifice 25; Further sleeve 13 is provided with the cushion that covers discharge orifice 25, and said cushion is a rubber pad 6, and 25 border is provided with the bar shaped angle bar 24 of compacting rubber pad 6 in the discharge orifice; Angle bar 24, rubber pad 6 and further sleeve 13 are nailed together through bolt 23; Be that bolt 23 interted angle bar 24, rubber pad 6 and further sleeve 13 tube walls, the three is fixed together, play fastening rubber pad 6 and install firmly and the effect of good seal.Rubber pad 6 is just necessary fixation before further sleeve 13 is lowered to pit shaft 35, avoids destroying midway, and such meeting bring bigger trouble to operation, so must guarantee to install firm before being lowered to.
Be provided with centralizer 5 between further sleeve 13 and the production casing 12; Further sleeve 13 outer rings of discharge orifice 25 downsides set firmly first packer 14; First packer 14 is positioned at the outer ring, bottom of further sleeve 13; Production casing 12 bottoms are higher than the bottom of further sleeve 13, and the space between production casing 12 bottoms and further sleeve 13 outer tube walls is water inlet.Water inlet is in height between the discharge orifice 25 and first packer 14.
Be equipped with pressure gauge 7 on the tube wall of the further sleeve 13 of the outer wall of said oil pipe 3 bottoms and first packer, 14 upsides; Pressure gauge 7 corresponding water inlet settings; Pressure gauge 7 is connected with Computer signal acquisition system 31 through cable 30, and Computer signal acquisition system 31 comprises that A/D converter or other converter change and computer, and pressure gauge 7 converts signal into data signal; Computer or other record memory device of restoring, pressure gauge 7 is convenient to monitor bottom pressure.
Said first packer 14 is the rubber bag tank of annular, and rubber bag tank is wrapped in the canvas net, and rubber bag tank is connected with high-pressure pump 21 through pneumatic circuit 20, and pneumatic circuit 20 is provided with valve 29.Parcel canvas net is excessively to enlarge under hyperbar for fear of the rubber packer in the rubber bag tank outside, and wherein the volume of canvas net is a bit larger tham the volume of rubber packer, so just guarantees both can effectively separate, and is unlikely to rubber bag tank again and excessively enlarges.So should be before beginning construction, rubber bag tank is expanded reach required pressure through high-pressure pump 21 pressurization after, valve-off 29 just can reach good packing effect.Wherein rubber bag tank will be fixed on the further sleeve 13 before further sleeve 13 is lowered to.Certainly, the present invention is not limited to above-mentioned form, and first packer 14 can also be existing casing packer, and the packer that can play the outer coal seam of packing pipe all can.Said closeouts 22 both can the identical rubber bag tank that is connected with air pump that is with first packer, 14 structures, also can be casing packer, and perhaps seal weld is connected to the doughnut-shaped steel plate between further sleeve 13, production casing 12 tops.
Said dewatering installation comprises the sucker rod 2 that plugs in oil pipe 3 and the oil pipe 3, and oil pipe 3 tops set out the mouth of a river 1, and the bottom of oil pipe 3 sets gradually pump 16, tail pipe 17, metal wrapping wire sieve 18, sand sediment pipe 8 and plug 9 from top to bottom.Certainly, the present invention is not limited to above-mentioned form, and oil pipe 3 also can be connected with suction pump, and perhaps dewatering installation adopts screw pump also can.Draining is most important to cbm development, mainly is the pressure that reduces reservoir through draining, makes coal bed gas desorb output.Carry out drainage and step-down through oil pipe 3, make the coal bed gas output.Through control stroke jig frequency, rationally dispose and optimize row's degree of gathering and processing.Make the maximization of coal bed gas well production capacity.
Certainly; The present invention is not limited to above-mentioned form; When production casing 12 bottoms and further sleeve 13 bottoms maintain an equal level; Annular space between first packer 14 shutoff production casings, 12 bottoms and further sleeve 13 bottoms is provided with water inlet on production casing 12 tube walls of first packer, 14 upsides and gets final product, and can reach goal of the invention equally.
Construction sequence is following:
1. the size of the high difference of liquid level when estimating two payzone aerogenesis and liquid level possibility maximum height, the distribution of appropriate design discharge orifice 25 and pitch of holes.
2. according to last coal seam 15 aquifer yields of prediction and the diameter of rational row's degree of gathering and processing appropriate design discharge orifice 25.
3. testing fixture integrity.
4. correct linkage.
5. multiple seam is grown the district and close layer row and adopt equipment and be lowered to pit shaft 35, and fix through wellhead assembly at well head.
6. start high-pressure pump 21, make packer carry out effective packing.
7. formulating reasonably row's degree of gathering and processing begins row and adopts.
Present embodiment is an example with two-layer coal seam; Further sleeve 13 and production casing 12 are lowered in the pit shaft 35; Pit shaft 35 passes the face of land from top to bottom successively, goes up coal seam 15, rock stratum and following coal seam 19; Production casing 12 fits with pit shaft 35 walls, and surface pipe 11 tops and ground 10 maintain an equal level, and further sleeve 13 is above the ground level 10 with production casing 12 tops.High-pressure pump 21 all is positioned on the ground 10 with Computer signal acquisition system 31.First packer 14 offsets with the rock stratum well bore wall of last coal seam 15 downsides; Water inlet charges into gases at high pressure over against last coal seam 15 in the rubber bag tank of first packer 14, first packer 14 and further sleeve 13 will go up coal seam 15 and open with 19 packings of following coal seam; Can make the water in coal seam 15 flow in the annular space between production casing 12 and the further sleeve 13 through water inlet; And the water in coal seam 19 directly gets in the further sleeve 13 down, promptly to two payzones: go up coal seam 15 and following coal seam 19, carry out effective packing; Two payzones are in two different pressure systems, are independent of each other in row's process of adopting.Specifically can be according to the spacing between two payzones and the difference of critical desorption pressures, the difference in height h of liquid level when calculating two payzone aerogenesis is according to the thickness of actual conditions appropriate design rubber pad 6.When making its liquid level difference greater than h, the water of last payzone output just can flow into pit shaft 35 through after crushing rubber pad 6, extracts out through oil pipe 3.So just can realize two payzones are carried out drainage and step-down, realize closing the purpose that layer row adopts through an oil pipe 3.In case that is to say when row adopts the liquid level discrepancy in elevation greater than h, the water of last payzone will crush rubber pad 6 and flow into pit shafts 35, and two liquid levels descend gradually then, rationally controls flow velocity and can control the upper strata liquid level and underspeed.Can control down coal seam 19 liquid levels through the control discharge capacity and underspeed, so just can control effectively, rationally arrange and adopt two payzone liquid levels.Row is when adopting, according to size, the spacing of the adjacent discharge orifice 25 of appropriate design and the hole count in a week of the h of aforementioned calculation.Only if specific (special) requirements generally with one Thursday the hole, spacing is good for ten meters, so both can avoid the too intensive reduction that causes casing strength in hole, be unlikely to again the distance excessive.When design flow water hole 25, should at first predict liquid level maximum possible height, there is no need to be provided with discharge orifice 25 in the place that liquid level can't arrive.Reduce unnecessary workload.When centralizer 5 can be guaranteed to descend further sleeve 13, centralizer is preferably arranged, can avoid further sleeve 13 amesiality, influence the effect in later stage.Centralizer 5 is installed for 100 meters with spacing.Be lowered to after the pit shaft 35, further sleeve 13 and production casing 12 are suspended on the wellhead assembly, and fixing.
This example is suitable for the many situation of coal seam 19 product water down, and critical desorption pressures is little, in conventional drainage procedure in the past; In order to make down coal seam 19 aerogenesis early, just must strengthen discharge capacity, reduce bottom pressure; It is too fast that this will certainly cause coal seam 15 bottom pressures to reduce; Cause effective stress to increase, the permeability in coal seam is descended fast, cause the later stage to be arranged and adopt and to carry out.Grow the district through multiple seam and close layer row and adopt equipment and can the water of two payzone outputs effectively be separated, avoid effective UNICOM.So just can in drainage procedure, make the bottom pressure of two pressure systems be in different values, efficiently solve the problems referred to above.So just can strengthen discharge capacity the bottom pressure in coal seam 19 is reduced fast, and can not cause excessive injury last coal seam 15.
Embodiment 2:
Close layer row by a kind of multiple seam growth district shown in Figure 3 and adopt equipment; Be with the difference of embodiment 1: said further sleeve 13 is divided into upper and lower two sections; Closeouts 22, first packer 14 are arranged at further sleeve epimere 13A up and down and lay respectively at top and the bottom of further sleeve epimere 13A; Further sleeve epimere 13A outer ring fixed cover is provided with production casing 12; Be provided with centralizer 5 between further sleeve 13 and the production casing 12, closeouts 22 is between further sleeve 13 and production casing 12, and first packer 14 is plugged between the bottom of further sleeve 13 and production casing 12.Second packer 33 and the 3rd packer 34 are set up and down in the outer ring of further sleeve hypomere 13B; Be fixedly connected with tube connector 28 between upper and lower section 13A of further sleeve, the 13B; Further sleeve epimere 13A tube wall is provided with the connecting hole that is positioned at second packer, 33 upsides; Further sleeve hypomere 13B tube wall is provided with the connecting hole that is positioned at the 3rd packer 34 downsides; Said tube connector 28 1 ends connect the connecting hole of further sleeve epimere 13A, and tube connector 28 other ends connect the connecting hole of further sleeve hypomere 13B.
Said first packer 14, second packer 33 are identical with the 3rd packer 34 structures, are the rubber bag tank of annular, and rubber bag tank is wrapped in the canvas net, and rubber bag tank is connected with high-pressure pump 21 through pneumatic circuit 20.Pneumatic circuit 20 is provided with valve 29.Said closeouts 22 both can identically with first packer, 14 structures be the rubber bag tank that air pump connects, and also can be casing packer, and perhaps seal weld is connected to the doughnut-shaped steel plate between further sleeve 13, production casing 12 tops.
This example is identical with the principle of embodiment 1; Be suitable for coal seam 15 and produce the many situation of water, the water in last coal seam 15 enters in the epimere 13A and hypomere 13B of further sleeve 13 outside tube connector 28 pipes, promptly enters in the pit shaft 35; Taken away by oil pipe 3 and sucker rod 2; Second packer 33 and the 3rd packer 34 will be descended the mouth of a river packing of coal seam 19 on pit shaft 35, and the water in following coal seam 19 is from the hypomere 13B of further sleeve 13 and the space between the pit shaft 35, through the annular space between tube connector 28 inflow further sleeve epimere 13A and the production casing 12; Reach certain pressure and crush rubber pad 6, flow in the epimere and hypomere 13B of further sleeve 13.
Embodiment 3:
Close layer row by a kind of multiple seam growth district shown in Figure 4 and adopt equipment; The further sleeve 13 that comprises the set inside dewatering installation is arranged with surface pipe 11 in outer ring, further sleeve 13 top, and further sleeve 13 and surface pipe 11 are vertical setting; The outer ring, top of further sleeve 13 is provided with closeouts 22; Closeouts 22 is plugged between the top and pit shaft 35 tops of further sleeve 13, and further sleeve 13 tube walls of closeouts 22 downsides are provided with discharge orifice 25, and further sleeve 13 is provided with the cushion that covers discharge orifice 25; Said cushion is a rubber pad 6; 25 border is provided with the bar shaped angle bar 24 of compacting rubber pad 6 in the discharge orifice, and angle bar 24, rubber pad 6 and further sleeve 13 are nailed together through bolt 23, and promptly bolt 23 interted angle bar 24, rubber pad 6 and further sleeve 13 tube walls; The three is fixed together the effect of playing fastening rubber pad 6 and firm and good seal being installed.Rubber pad 6 is just necessary fixation before further sleeve 13 is lowered to pit shaft 35, avoids destroying midway, and such meeting bring bigger trouble to operation, so must guarantee to install firm before being lowered to.
Be equipped with pressure gauge 7 on the tube wall of the further sleeve 13 of the outer wall of said oil pipe 3 bottoms and first packer, 14 upsides; Pressure gauge 7 corresponding water inlet settings; Pressure gauge 7 is connected 31 through cable 30 and connects with the Computer signal acquisition system, Computer signal acquisition system connection 31 comprises that A/D converter or other converter change and computer, and pressure gauge 7 converts signal into data signal; Computer or other record memory device of restoring, pressure gauge 7 is convenient to monitor bottom pressure.
Said first packer 14 is the rubber bag tank of annular, and rubber bag tank is wrapped in the canvas net, and rubber bag tank is connected with high-pressure pump 21 through pneumatic circuit 20, and pneumatic circuit 20 is provided with valve 29.Parcel canvas net is excessively to enlarge under hyperbar for fear of the rubber packer in the rubber bag tank outside, and wherein the volume of canvas net is a bit larger tham the volume of rubber packer, so just guarantees both can effectively separate, and is unlikely to rubber bag tank again and excessively enlarges.So should be before beginning construction, rubber bag tank is expanded reach required pressure through high-pressure pump 21 pressurization after, valve-off 29 just can reach good packing effect.Wherein rubber bag tank will be fixed on the further sleeve 13 before further sleeve 13 is lowered to.Certainly, the present invention is not limited to above-mentioned form, and first packer 14 can also be existing casing packer, and the packer that can play the outer coal seam of packing pipe all can.Said closeouts 22 both can the identical rubber bag tank that is connected with air pump that is with first packer, 14 structures, also can be casing packer, and perhaps seal weld is connected to the doughnut-shaped steel plate of outer ring, further sleeve 13 top.
Said dewatering installation comprises the sucker rod 2 that plugs in oil pipe 3 and the oil pipe 3, and oil pipe 3 tops set out the mouth of a river 1, and the bottom of oil pipe 3 sets gradually pump 16, tail pipe 17, metal wrapping wire sieve 18, sand sediment pipe 8 and plug 9 from top to bottom.Certainly, the present invention is not limited to above-mentioned form, and oil pipe 3 also can be connected with suction pump, and perhaps dewatering installation adopts screw pump also can.Draining is most important to cbm development, mainly is the pressure that reduces reservoir through draining, makes coal bed gas desorb output.Carry out drainage and step-down through oil pipe 3, make the coal bed gas output.Through control stroke jig frequency, rationally dispose and optimize row's degree of gathering and processing.Make the maximization of coal bed gas well production capacity.
Claims (9)
1. close layer row and adopt equipment in a multiple seam growth district; It is characterized in that: comprise further sleeve; The outer ring, top of further sleeve is provided with closeouts; The further sleeve tube wall of closeouts downside is provided with the discharge orifice, and the further sleeve outer ring of discharge orifice downside is provided with first packer, and further sleeve is provided with the cushion that covers the discharge orifice.
2. close layer row and adopt equipment in multiple seam growth as claimed in claim 1 district; It is characterized in that: further sleeve outer ring fixed cover is provided with production casing; Closeouts is plugged between further sleeve and the production casing; Be provided with centralizer between further sleeve and the production casing, production casing is provided with between water inlet or production casing bottom and the further sleeve outer tube wall and is provided with water inlet, and water inlet is between the discharge orifice and first packer.
3. close layer row and adopt equipment in multiple seam growth as claimed in claim 2 district, and it is characterized in that: be equipped with pressure gauge on the tube wall of the further sleeve of the said oil-pipe external wall and the first packer upside, pressure gauge is connected with the Computer signal acquisition system through cable.
4. close layer row and adopt equipment in multiple seam growth as claimed in claim 1 district; It is characterized in that: said further sleeve is divided into two sections; Closeouts, first packer are arranged at the further sleeve epimere up and down, in the outer ring of further sleeve hypomere second packer accessory and the 3rd packer accessory are set up and down, are fixedly connected with tube connector between upper and lower section of the further sleeve; Further sleeve epimere tube wall is provided with the connecting hole that is positioned at the second packer accessory upside; Further sleeve hypomere tube wall is provided with the connecting hole that is positioned at the 3rd packer accessory downside, and said tube connector one end connects the connecting hole of further sleeve epimere, and the tube connector other end connects the connecting hole of further sleeve hypomere.
5. close layer row and adopt equipment in multiple seam growth as claimed in claim 4 district; It is characterized in that: further sleeve epimere outer ring fixed cover is provided with production casing; Be provided with centralizer between further sleeve and the production casing; Closeouts is between further sleeve and production casing, and first packer accessory is plugged between the bottom of further sleeve and production casing.
6. close layer row and adopt equipment in multiple seam growth as claimed in claim 5 district; It is characterized in that: be equipped with pressure gauge on the tube wall of the further sleeve hypomere on the said oil-pipe external wall and between second and third packer, pressure gauge is connected with the Computer signal acquisition system through cable.
7. close layer row and adopt equipment in multiple seam growth as claimed in claim 6 district; It is characterized in that: said first packer, second packer and the 3rd packer are the rubber bag tank of annular; Rubber bag tank is wrapped in the canvas net, and rubber bag tank is connected with high-pressure pump through pneumatic circuit.
8. close layer row like each described multiple seam growth district of claim 1-7 and adopt equipment; It is characterized in that: said cushion is a rubber pad; Be provided with the bar shaped angle bar of compacting rubber pad in the border of discharge orifice, steel plate, rubber pad and further sleeve are nailed together through bolt.
9. close layer row and adopt equipment in multiple seam growth as claimed in claim 8 district, it is characterized in that: dewatering installation is set in the further sleeve.
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| CN201110394769.2A CN102434135B (en) | 2011-12-02 | 2011-12-02 | Multi-layer discharge and mining device for multiple seam developed area |
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| CN201110394769.2A CN102434135B (en) | 2011-12-02 | 2011-12-02 | Multi-layer discharge and mining device for multiple seam developed area |
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| WO2014198103A1 (en) * | 2013-06-09 | 2014-12-18 | 华中科技大学 | Salvaging-type water drainage and gas retrieval machine |
| CN104389595A (en) * | 2014-11-18 | 2015-03-04 | 山西潞安环保能源开发股份有限公司 | Acquisition method of stratum parameters of low pressure coal bed methane basin |
| CN104912522A (en) * | 2015-05-11 | 2015-09-16 | 中国矿业大学 | Multi-hydraulic-fracturing-layer drainage and mining device for coal-bed gas well in high-stress region and multi-hydraulic-fracturing-layer drainage and mining process for coal-bed gas well in high-stress region |
| CN106481281A (en) * | 2015-08-25 | 2017-03-08 | 中国石油天然气股份有限公司 | A kind of tubular column structure of coal bed gas well and coal bed gas well system |
| CN106988707A (en) * | 2017-04-10 | 2017-07-28 | 中煤科工集团西安研究院有限公司 | Double coal seam four-way packer layered pressure controls combine mining device and method |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN108343408A (en) * | 2017-01-24 | 2018-07-31 | 中国石油天然气股份有限公司 | Water drive gas reservoir recovery method |
| CN108915650A (en) * | 2018-07-10 | 2018-11-30 | 中国地质大学（北京） | The devices and methods therefor of difference pressure drop during a kind of simulation coal bed gas extraction |
| WO2020082716A1 (en) * | 2018-10-24 | 2020-04-30 | 中国矿业大学 | Multi-seam independent gas-bearing system pressure control and single-pump production device and production method |
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