CN102434135B - 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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- CN102434135B CN102434135B CN201110394769.2A CN201110394769A CN102434135B CN 102434135 B CN102434135 B CN 102434135B CN 201110394769 A CN201110394769 A CN 201110394769A CN 102434135 B CN102434135 B CN 102434135B
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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 development area and close a layer mining equipment.
Background technology
Multiple seam is generally grown in China most areas, the area of growing in multiple seam, only carry out coal bed gas Ground Developing with individual layer, investment risk is large, in order to reduce cost of exploration & development, the region of growing in multiple seam, many coal bed gas company has taked multiple coal seams all to drill, and uses screw pump, electric submersible pump or beam pump to reach by the water in mining multilayer coal the object that multilayer coal is combined aerogenesis.When implementing multiple seam and closing layer mining, because they " share " pit shaft, the speed that in water pumping gas production process, pressure transmits is very large to aerogenesis rate, if one deck coal aerogenesis speed is very fast, certainly will cause the movement of coal dust or proppant, the movement of coal dust or proppant, can cause that coal seam reservoirs crack passage stops up, crack passage stops up, and can affect pressure transmission and then affect gas production.Therefore while, how ensureing multiple seam aerogenesis pressure transmission speed be continue, stablize, the key of high yield.After aerogenesis, the speed speed of pressure transmission be controlled by the one hand coal seam itself permeability, country rock and coal seam the property of water-bearing and contact tightness degree etc., and these factors are objective reality, almost cannot change; Pressure drop while being controlled by mining on the other hand, pressure drop is common decision the in two aspects of drainability by stratum fluid supply capacity and mining equipment.At present, when multilayer coal closes layer mining, because it " shares " same pit shaft, while carrying out mining with current mining equipment, the producing fluid level of multilayer coal is identical, in the time that the fluid supply capacity otherness of multilayer coal is more obvious, certainly will cause the transmission of one deck coal pressure fast, the transmission of another layer of coal pressure is slow, may cause the excitement of one deck coal pressure, greatly affects aerogenesis effect.Inconsistent for multiple seam pressure system, stratum feed flow otherness is large, carry out mining with current mining equipment, 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 the pressure system adjusting device of layer mining, be to carry out multiple seam in this class area to close a layer mining, improve key stable, lasting, high yield.
Summary of the invention
While the object of the invention is to close layer mining for multiple seam development area, the stratum fluid supply capacity otherness of multilayer coal is large, current mining equipment carries out mining, pressure is difficult to control, may cause the fact that permeability sharply declines and then causes gas production to greatly reduce, provide a kind of multiple seam development area to close a layer mining equipment, realize multiple seam pressure and steadily reduce, close rationally, efficiently a layer mining, reach aerogenesis steadily, continue, the object of high yield.
For achieving the above object, the present invention adopts following technical scheme: a layer mining equipment is closed in a kind of multiple seam development area, 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 discharge orifice, the further sleeve outer ring of discharge orifice downside arranges the first packing body, and further sleeve is provided with the cushion that covers discharge orifice.
Further sleeve outer ring fixed cover is provided with production casing, closeouts is plugged between further sleeve and production casing, between further sleeve and production casing, be provided with centralizer, production casing is provided with between water inlet or production casing bottom and further sleeve outer tube wall and is provided with water inlet, and water inlet is between discharge orifice and the first packing body.
On the tube wall of the further sleeve of described oil-pipe external wall and the first packing body upside, be equipped with pressure gauge, pressure gauge is connected with zoophysiology by cable.
Described further sleeve is divided into two sections, closeouts, the first packing body are setting up and down in further sleeve epimere, at the outer ring of further sleeve hypomere the second packing body setting up and down and the 3rd packing body, between upper and lower section of further sleeve, be fixedly connected with tube connector, further sleeve epimere tube wall is provided with the connecting hole that is positioned at the second packing body upside, further sleeve hypomere tube wall is provided with the connecting hole that is positioned at the 3rd packing body downside, described 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, between further sleeve and production casing, is provided with centralizer, and closeouts is between further sleeve and production casing, and the first packing body is plugged between the bottom of further sleeve and production casing.
On the tube wall of the further sleeve hypomere on described oil-pipe external wall and between second and third packing body, be equipped with pressure gauge, pressure gauge is connected with zoophysiology by cable.
Described the first packing body, the second packing body and the 3rd packing body are annular rubber bag tank, and rubber bag tank is wrapped in canvas net, and rubber bag tank is connected with high-pressure pump by pneumatic circuit.
Described cushion is 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 by bolt.
Dewatering installation is set in further sleeve.
A layer mining equipment is closed in multiple seam of the present invention development area, is applicable to multiple seam and develops simultaneously, only need to make each payzone in different pressure systems by multilayer further sleeve, will not interfere with each other like this.It has the following advantages: 1. efficiently solve many storage fluid supply capacity diversity ratios larger, adopt conventional mining equipment control difficulty larger, may cause permeability heavy damage and then cause gas production to greatly reduce, can not close a difficult problem for layer mining.2. pair further sleeve has been carried out packing effectively, makes it form two pressure systems, in the time of mining, does not interfere with each other.3. effectively controlled liquid level poor, liquid level is poor while reaching certain value, and rubber pad breaks automatically, and two-layer product water can be discharged by an oil pipe.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the structural representation of rubber pad;
Fig. 3 is the structural representation of the embodiment of the present invention 2;
Fig. 4 is the structural representation of the embodiment of the present invention 3;
Detailed description of the invention
Embodiment 1:
Close a layer mining equipment by a kind of multiple seam development area shown in Fig. 1 and Fig. 2, comprise that inside arranges the further sleeve 13 of dewatering installation, further sleeve 13 outer ring fixed covers are provided with production casing 12, be provided with surface pipe 11 at production casing 12 top outer ring sleeves, further sleeve 13, production casing 12 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 of further sleeve 13 and the top of production casing 12, 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, described cushion is rubber pad 6, be provided with the bar shaped angle bar 24 of compacting rubber pad 6 in the border of discharge orifice 25, angle bar 24, rubber pad 6 and further sleeve 13 are nailed together by bolt 23, be that bolt 23 interted angle bar 24, rubber pad 6 and further sleeve 13 tube walls, three is fixed together, play fastening rubber pad 6, and the effect that firm and good seal are installed.Rubber pad 6 is just necessary fixation before further sleeve 13 is lowered to pit shaft 35, avoids destroying midway, can bring larger trouble to operation like that, so must guarantee before being lowered to install firmly.
Between further sleeve 13 and production casing 12, be provided with centralizer 5, further sleeve 13 outer rings of discharge orifice 25 downsides set firmly the first packing body 14, the first packing body 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 discharge orifice 25 and the first packing body 14.
On the tube wall of the outer wall of described oil pipe 3 bottoms and the further sleeve 13 of the first packing body 14 upsides, be equipped with pressure gauge 7, the corresponding water inlet setting of pressure gauge 7, pressure gauge 7 is connected with zoophysiology 31 by cable 30, zoophysiology 31 comprises A/D converter or the conversion of other converter and computer, signal is converted to data signal by pressure gauge 7, restore computer or other records memory device, and pressure gauge 7 is convenient to monitor bottom pressure.
Described the first packing body 14 is annular rubber bag tank, and rubber bag tank is wrapped in canvas net, and rubber bag tank is connected with high-pressure pump 21 by pneumatic circuit 20, is provided with valve 29 on pneumatic circuit 20.At rubber bag tank outside parcel canvas net, be excessively to expand under hyperbar for fear of rubber packing body, wherein the volume of canvas net is a bit larger tham the volume of rubber packing body, so just guarantees both can effectively separate, and is unlikely to again rubber bag tank and excessively expands.So should be before starting construction, after making rubber bag tank expansion reach required pressure by high-pressure pump 21 pressurizations, valve-off 29 just can reach good packing effect.Wherein rubber bag tank will be fixed in further sleeve 13 before further sleeve 13 is lowered to.Certainly, the present invention is not limited to above-mentioned form, and the first packing body 14 can also be existing casing packer, and the packer that can play the outer coal seam of packing pipe all can.Described closeouts 22 both can with the identical rubber bag tank being connected with air pump that is of the first packing body 14 structures, can be also casing packer, or the doughnut-shaped steel plate of seal welding between further sleeve 13, production casing 12 tops.
Described dewatering installation comprises the sucker rod 2 plugging in oil pipe 3 and 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, or dewatering installation adopts screw pump also can.Draining is most important to cbm development, is mainly the pressure that reduces reservoir by draining, makes coal bed gas desorb output.Carry out drainage and step-down by oil pipe 3, make coal bed gas product.By controlling stroke jig frequency, rationally dispose and optimize mining system.Coal bed gas well production capacity is maximized.
Certainly, the present invention is not limited to above-mentioned form, in the time that production casing 12 bottoms and further sleeve 13 bottoms maintain an equal level, annular space between the first packing body 14 shutoff production casing 12 bottoms and further sleeve 13 bottoms, on production casing 12 tube walls of the first packing body 14 upsides, water inlet is set, can reaches equally goal of the invention.
Construction sequence is as follows:
1. the size of the high difference of liquid level while 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 the diameter of upper coal seam 15 aquifer yields of prediction and rational mining system appropriate design discharge orifice 25.
3. testing fixture integrity.
4. exact connect ion device.
5. multiple seam development area is closed to layer mining equipment and be lowered to pit shaft 35, and be fixed by wellhead assembly at well head.
6. start high-pressure pump 21, make packer carry out effective packing.
7. formulate rational mining system and start mining.
The present embodiment is taking two-layer coal seam as example, further sleeve 13 and production casing 12 are lowered in pit shaft 35, pit shaft 35 is from top to bottom successively through earth's surface, upper coal seam 15, He Xia coal seam, rock stratum 19, production casing 12 fits with pit shaft 35 walls, 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 is all positioned on ground 10 with zoophysiology 31.The first packing body 14 offsets with the rock stratum well bore wall of upper coal seam 15 downsides, water inlet is just to upper coal seam 15, in the rubber bag tank of the first packing body 14, be filled with gases at high pressure, the first packing body 14 and further sleeve 13 are opened 15Yu Xia coal seam 19 packings of upper coal seam, can make the water in coal seam 15 flow in the annular space between production casing 12 and further sleeve 13 by water inlet, and the water in lower coal seam 19 directly enters in further sleeve 13, to two payzones: upper coal seam 15 and lower coal seam 19, carry out effective packing, make two payzones in two different pressure systems, be independent of each other in mining process.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 while calculating two payzone aerogenesis, according to the thickness of actual conditions appropriate design rubber pad 6.While making the poor h of being greater than of its liquid level, the water of upper payzone output just can, by after crushing rubber pad 6, flow into pit shaft 35, extracts out by oil pipe 3.So just can realize two payzones are carried out to drainage and step-down by an oil pipe 3, realize the object of closing layer mining.Once that is to say that the liquid level discrepancy in elevation is greater than h in the time of mining, the water of upper payzone will crush rubber pad 6 and flow into pit shaft 35, then two liquid levels decline gradually, and reasonable coutroi velocity can be controlled upper strata liquid level and underspeed.Can control lower coal seam 19 liquid levels by control discharge capacity and underspeed, so just can control effectively to two payzone liquid levels, rationally carry out mining.When mining, according to the size of the h of above-mentioned calculating, the spacing of the adjacent discharge orifice 25 of appropriate design and the hole count of a week.Unless particular/special requirement generally with one Thursday hole, ten meters of spacing are good, so both can avoid the too intensive reduction that causes casing strength in hole, are unlikely to again distance excessive.In the time of design flow water hole 25, should first predict liquid level maximum possible height, the place that cannot arrive at liquid level there is no need to arrange discharge orifice 25.Reduce unnecessary workload.When centralizer 5 can be guaranteed lower further sleeve 13, there is good centralizer, can avoid further sleeve 13 amesiality, affect the effect in later stage.Centralizer 5 is installed with 100 meters of spacing.After being lowered to pit shaft 35, further sleeve 13 and production casing 12 are suspended on wellhead assembly, and fixing.
This example is suitable for lower coal seam 19 and produces the situation that water is many, critical desorption pressures is little, in conventional drainage procedure in the past, in order to make early aerogenesis of lower coal seam 19, just must strengthen discharge capacity, reduce bottom pressure, this will certainly cause coal seam 15 bottom pressures to reduce too fast, cause effective stress to increase, make the permeability fast-descending in coal seam, cause later stage mining to carry out.Closing layer mining equipment by multiple seam development area can effectively separate the water of two payzone outputs, avoids effective UNICOM.So just can be in drainage procedure, make the bottom pressure of two pressure systems in different values, efficiently solve the problems referred to above.So just can strengthen the bottom pressure fast reducing that discharge capacity makes lower coal seam 19, and can not cause excessive injury to upper coal seam 15.
Further sleeve 13 is for setting up 19 liang, upper and lower coal seam independent pressure system, phase mutual interference while avoiding mining.The water of two payzone outputs is cut apart, in the annular space of the water of upper coal seam 15 outputs between further sleeve 13 and production casing 12, flowed.In the annular space of water in lower coal seam 19 between further sleeve 13 and oil pipe 3, flow.Avoid interfering with each other between two coal seams.So, if outside further sleeve 13 production casing 12 is not set, go up the spatial flow that payzone water can be between further sleeve 13 and pit shaft 35, reach force value, break through rubber pad 6, flow in further sleeve 13 from discharge orifice 25, equally can reach goal of the invention, still, be most preferred embodiment at the outer production casing 12 that arranges of further sleeve 13, production casing 12 can permeate to rock stratum by anti-sealing, is more conducive to draining.In the time production casing 12 not being set, 22 of closeouts are between shutoff further sleeve 13 outer walls and pit shaft 35 walls, to prevent that water from flowing out between further sleeve 13 outer walls and pit shaft 35 walls.
Embodiment 2:
A layer mining equipment is closed in a kind of multiple seam development area as shown in Figure 3, be with the difference of embodiment 1: described further sleeve 13 is divided into, lower two sections, closeouts 22, the first packing body 14 is setting up and down in further sleeve epimere 13A 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, between further sleeve 13 and production casing 12, be provided with centralizer 5, closeouts 22 is between further sleeve 13 and production casing 12, the first packing body 14 is plugged between the bottom of further sleeve 13 and production casing 12.At the outer ring of further sleeve hypomere 13B the second packing body 33 setting up and down and the 3rd packing body 34, between further sleeve upper and lower section of 13A, 13B, be fixedly connected with tube connector 28, further sleeve epimere 13A tube wall is provided with the connecting hole that is positioned at the second packing body 33 upsides, further sleeve hypomere 13B tube wall is provided with the connecting hole that is positioned at the 3rd packing body 34 downsides, described tube connector 28 one end connect the connecting hole of further sleeve epimere 13A, and tube connector 28 other ends connect the connecting hole of further sleeve hypomere 13B.
Described the first packing body 14, the second packing body 33 are identical with the 3rd packing body 34 structures, are annular rubber bag tank, and rubber bag tank is wrapped in canvas net, and rubber bag tank is connected with high-pressure pump 21 by pneumatic circuit 20.Pneumatic circuit 20 is provided with valve 29.Described closeouts 22 both can identically with the first packing body 14 structures be the rubber bag tank that air pump connects, and can be also casing packer, or the doughnut-shaped steel plate of seal welding 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 situation that water is many, the water in upper coal seam 15 enters in the epimere 13A and hypomere 13B of further sleeve 13 from tube connector 28 pipes, enter in pit shaft 35, taken away by oil pipe 3 and sucker rod 2, the mouth of a river packing on pit shaft 35 by lower coal seam 19 of the second packing body 33 and the 3rd packing body 34, the water in lower coal seam 19 is from the space between hypomere 13B and the pit shaft 35 of further sleeve 13, flow into the annular space between further sleeve epimere 13A and production casing 12 through tube connector 28, reach certain pressure and crush rubber pad 6, flow in the epimere and hypomere 13B of further sleeve 13.
Embodiment 3:
A layer mining equipment is closed in a kind of multiple seam development area as shown in Figure 4, comprise that inside arranges the further sleeve 13 of dewatering installation, be provided with surface pipe 11 at further sleeve 13 top outer ring sleeves, 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, 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, described cushion is rubber pad 6, be provided with the bar shaped angle bar 24 of compacting rubber pad 6 in the border of discharge orifice 25, angle bar 24, rubber pad 6 and further sleeve 13 are nailed together by bolt 23, be that bolt 23 interted angle bar 24, rubber pad 6 and further sleeve 13 tube walls, three is fixed together, play fastening rubber pad 6, and the effect that firm and good seal are installed.Rubber pad 6 is just necessary fixation before further sleeve 13 is lowered to pit shaft 35, avoids destroying midway, can bring larger trouble to operation like that, so must guarantee before being lowered to install firmly.
Further sleeve 13 outer rings of discharge orifice 25 downsides set firmly the first packing body 14, the first packing body 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 discharge orifice 25 and the first packing body 14.
On the tube wall of the outer wall of described oil pipe 3 bottoms and the further sleeve 13 of the first packing body 14 upsides, be equipped with pressure gauge 7, the corresponding water inlet setting of pressure gauge 7, pressure gauge 7 is connected 31 by cable 30 and connects with zoophysiology, zoophysiology connects 31 and comprises A/D converter or the conversion of other converter and computer, signal is converted to data signal by pressure gauge 7, restore computer or other records memory device, and pressure gauge 7 is convenient to monitor bottom pressure.
Described the first packing body 14 is annular rubber bag tank, and rubber bag tank is wrapped in canvas net, and rubber bag tank is connected with high-pressure pump 21 by pneumatic circuit 20, is provided with valve 29 on pneumatic circuit 20.At rubber bag tank outside parcel canvas net, be excessively to expand under hyperbar for fear of rubber packing body, wherein the volume of canvas net is a bit larger tham the volume of rubber packing body, so just guarantees both can effectively separate, and is unlikely to again rubber bag tank and excessively expands.So should be before starting construction, after making rubber bag tank expansion reach required pressure by high-pressure pump 21 pressurizations, valve-off 29 just can reach good packing effect.Wherein rubber bag tank will be fixed in further sleeve 13 before further sleeve 13 is lowered to.Certainly, the present invention is not limited to above-mentioned form, and the first packing body 14 can also be existing casing packer, and the packer that can play the outer coal seam of packing pipe all can.Described closeouts 22 both can with the identical rubber bag tank being connected with air pump that is of the first packing body 14 structures, can be also casing packer, or seal welding be in the doughnut-shaped steel plate of further sleeve 13 outer rings, top.
Described dewatering installation comprises the sucker rod 2 plugging in oil pipe 3 and 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, or dewatering installation adopts screw pump also can.Draining is most important to cbm development, is mainly the pressure that reduces reservoir by draining, makes coal bed gas desorb output.Carry out drainage and step-down by oil pipe 3, make coal bed gas product.By controlling stroke jig frequency, rationally dispose and optimize mining system.Coal bed gas well production capacity is maximized.
Further sleeve 13 is for setting up 19 liang, upper and lower coal seam independent pressure system, phase mutual interference while avoiding mining.The water of two payzone outputs is cut apart, in the annular space of the water of upper coal seam 15 outputs between further sleeve 13 and well bore wall, flowed.In the annular distance of water in lower coal seam 19 between further sleeve 13 and oil pipe 3, flow.Avoid interfering with each other between two coal seams.The present embodiment is all identical with principle, the implementation step of embodiment 1, compared with embodiment 1, further sleeve 13 is outer does not arrange production casing 12, allows the spatial flow of payzone water between further sleeve 13 and pit shaft 35, reach force value, break through rubber pad 6, flow in further sleeve 13 from discharge orifice 25, equally can reach goal of the invention, but, at the outer production casing 12 that arranges of further sleeve 13, for most preferred embodiment, production casing 12 can permeate to rock stratum by anti-sealing, is more conducive to draining.In the time production casing 12 not being set, 22 of closeouts are between shutoff further sleeve 13 outer walls and well bore wall, to prevent that water from flowing out between further sleeve 13 outer walls and pit shaft 35 walls.
Claims (7)
1. a layer mining equipment is closed in a multiple seam development area, 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 discharge orifice, the further sleeve outer ring of discharge orifice downside arranges the first packing body, further sleeve is provided with the cushion that covers discharge orifice, described further sleeve is divided into two sections, closeouts, the first packing body is setting up and down in further sleeve epimere, at the outer ring of further sleeve hypomere the second packing body setting up and down and the 3rd packing body, in further sleeve, between hypomere, be fixedly connected with tube connector, further sleeve epimere tube wall is provided with the connecting hole that is positioned at the second packing body upside, further sleeve hypomere tube wall is provided with the connecting hole that is positioned at the 3rd packing body downside, described tube connector one end connects the connecting hole of further sleeve epimere, the tube connector other end connects the connecting hole of further sleeve hypomere.
2. a layer mining equipment is closed in multiple seam as claimed in claim 1 development area, it is characterized in that: further sleeve outer ring fixed cover is provided with production casing, closeouts is plugged between further sleeve and production casing, between further sleeve and production casing, be provided with centralizer, production casing is provided with between water inlet or production casing bottom and further sleeve outer tube wall and is provided with water inlet, and water inlet is between discharge orifice and the first packing body.
3. a layer mining equipment is closed in multiple seam as claimed in claim 2 development area, it is characterized in that: dewatering installation is set in further sleeve, described dewatering installation comprises the sucker rod plugging in oil pipe and oil pipe, on the tube wall of the further sleeve of described oil-pipe external wall and the first packing body upside, be equipped with pressure gauge, pressure gauge is connected with zoophysiology by cable.
4. a layer mining equipment is closed in multiple seam as claimed in claim 3 development area, it is characterized in that: further sleeve epimere outer ring fixed cover is provided with production casing, between further sleeve and production casing, be provided with centralizer, closeouts is between further sleeve and production casing, and the first packing body is plugged between the bottom of further sleeve and production casing.
5. a layer mining equipment is closed in multiple seam as claimed in claim 4 development area, it is characterized in that: on the tube wall of the further sleeve hypomere on described oil-pipe external wall and between second and third packing body, be equipped with pressure gauge, pressure gauge is connected with zoophysiology by cable.
6. a layer mining equipment is closed in multiple seam as claimed in claim 5 development area, it is characterized in that: described the first packing body, the second packing body and the 3rd packing body are annular rubber bag tank, rubber bag tank is wrapped in canvas net, and rubber bag tank is connected with high-pressure pump by pneumatic circuit.
7. a layer mining equipment is closed in the multiple seam development area as described in claim 1-6 any one, it is characterized in that: described cushion is rubber pad, the bar shaped angle bar that is provided with compacting rubber pad in the border of discharge orifice, bar shaped angle bar, rubber pad and further sleeve are nailed together by bolt.
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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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| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
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| US5343953A (en) * | 1993-08-24 | 1994-09-06 | Halliburton Company | Through-tubing recirculating tool assembly for well completions |
| US5881809A (en) * | 1997-09-05 | 1999-03-16 | United States Filter Corporation | Well casing assembly with erosion protection for inner screen |
| CN201277022Y (en) * | 2008-11-05 | 2009-07-22 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Concentric dual-tube layered polymer injecting column jacket capable of flushing |
| CN101403317A (en) * | 2008-11-12 | 2009-04-08 | 天津市特种设备监督检验技术研究院 | Double-wall sleeve suspension type high-pressure gas underground storing well installation method and structure thereof |
| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
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