CN206000529U - A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation - Google Patents

A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation Download PDF

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CN206000529U
CN206000529U CN201621033008.9U CN201621033008U CN206000529U CN 206000529 U CN206000529 U CN 206000529U CN 201621033008 U CN201621033008 U CN 201621033008U CN 206000529 U CN206000529 U CN 206000529U
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well
horizontal
straight
straight well
section
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魏江卓
杨凡
董文奎
王子卫
何晓飞
李艳龙
夏雪平
张建军
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In Beijing Wan Qi Energy Technology Services Co Ltd
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In Beijing Wan Qi Energy Technology Services Co Ltd
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Abstract

This utility model is related to a kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation, and it includes:The first straight well, the second straight well and the 3rd straight well setting gradually;Multi-lateral horizontal well system, including horizontal main shaft and some horizontal branch wells, horizontal main shaft includes vertical section, turn section and the horizontal segment being sequentially connected, vertical section is made up of the top of the first straight well, turn section is stretched out by the side window of vertical section, horizontal segment includes first level section, the second horizontal segment and the 3rd horizontal segment being sequentially connected, first level section one end connects turn section, the other end is connected with the second straight well, second horizontal segment one end is connected with the second straight well, the other end is connected with the 3rd straight well, and the 3rd horizontal segment is connected with the 3rd straight well.Whereby, not only effectively raise space availability ratio, substantially increase the gas production of whole region, more can effectively utilize resource, decrease construction volume and wellbore construction amount and the removal charge of horizontal well ground preliminary work for spudding, saved cost.

Description

A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation
Technical field
This utility model belongs to coal bed gas resource production technique field and in particular to a kind of many based on having of straight well transformation The coal bed gas well of branch horizontal well system.
Background technology
Coal bed gas refers to be stored in coal seam with methane as main component, to adsorb based on the matrix of coal particle surface, portion Divide and be free in coal hole or be dissolved in the hydrocarbon gas in coal seam water, be the associated minerals resource of coal, belong to Unconventional forage, It is cleaning, high-grade energy and the industrial chemicals that nearly ten or twenty year emerges in the world.It is commonly called as " gas ", calorific value is the 2- of general coal 5 times, the calorific value of 1 cubic metre of pure coal bed gas is equivalent to 1.13kg gasoline, 1.21kg standard coal, and its calorific value is suitable with natural gas, can With with natural gas mix defeated mixed, and burn after very clean, be nearly free from any waste gas, be first-class industry, chemical industry, generating With resident living fuel.When coal bed gas air concentration reaches 5%-16%, meeting naked light will explode, and this is coal mine gas from explosion thing Therefore root.Coal bed gas is directly discharged in air, and its greenhouse effect is about 21 times of carbon dioxide, to environmental destruction Extremely strong.If first exploiting coal bed methane before mining, coal mine gas from explosion rate will reduce by 70% to 85%.The exploitation profit of coal bed gas With having functions that to achieve many things at one stroke:Clear energy sources, commercialization can produce huge economic benefit, is national strategy resource.
Typically contain water in coal seam, therefore before being exploited, pressure drop funnel need to be formed by draining and reduce average reservoir Pressure is it is seen that the output of coal bed gas is the process that a complicated depressurization desorption spreads seepage flow.This is also bed gas reservoir The main distinction with normal gas pools.Adopting barefoot completion pattern coal bed gas finishing drilling horizontal well at present more, but, horizontal well is in mining Easily collapsed in generation coal seam, coal dust blocks well accident period, is the one of the main reasons causing the individual well daily output low.Therefore study Coal bed gas U-shaped well coal dust output mechanism, can provide important theoretical foundation to the high-efficiency mining realizing coal bed gas.
China's coalbed methane ground extraction technology, initially majority be used for reference external beat straight well and then pressure break production technique, A lot of straight wells are beaten in coal-bed gas exploitation initial stage the whole country by this China, straight well uncovering coal plane amasss few, along with coal The impact of layer hypotonicity geological conditions, the gas production of most of straight well is undesirable.
Up to the present, more than 14,000 mouthfuls, wherein 70% coal bed gas well produces Coalbed Methane In China ground extraction well quantity Tolerance does not reach business gas production standard (1000 sides/sky), in order to vitalize these coal bed gas wells, we make full use of original old On the basis of well, these old wells are carried out with well type transformation, increase gas production, make veteran send out sprouting, allow these old wells to come back to life, Again shine brilliance.
Utility model content
(1) technical problem to be solved
In order to solve the problems referred to above of prior art, this utility model provides a kind of has multiple-limb based on straight well transformation The coal bed gas well of horizontal well system, it can increase the bare area in coal seam, preferably links up seepage channel, increases single well-controlled Reserves, can improve region gas production.
(2) technical scheme
In order to achieve the above object, the main technical schemes that this utility model adopts include:
A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation, it includes:
The first straight well, the second straight well and the 3rd straight well setting gradually;
Multi-lateral horizontal well system, including horizontal main shaft and some horizontal branch wells, horizontal main shaft includes being sequentially connected Vertical section, turn section and horizontal segment, vertical section is made up of the top of the first straight well, turn section from vertical section side window to extension Stretch, horizontal segment includes first level section, the second horizontal segment and the 3rd horizontal segment being sequentially connected, the connection of first level section one end turns Trisection, the other end is connected with the second straight well, and second horizontal segment one end is connected with the second straight well, and the other end is connected with the 3rd straight well, 3rd horizontal segment is connected with the 3rd straight well.
By the setting of said structure, not only effectively raise space availability ratio, substantially increase the product of whole region Tolerance, more can effectively utilize resource, decrease construction volume and wellbore construction amount and the compensation for removal of horizontal well ground preliminary work for spudding With having saved cost.Except increased the inter-well interference of each coal bed gas well, simultaneously as the horizontal segment docking in horizontal main shaft Change to coal seam prime stratum stress in the drilling process of second, third two mouthfuls of straight wells, also substantially increases the infiltration in coal seam Rate, is conducive to desorbing, diffusion and the migration of coal bed gas, is that the release of the internal coal bed gas in coal seam creates good condition, increased The recovery ratio of coal bed gas.
In an embodiment of the present utility model, the part in some horizontal branch wells is located at first level section, another Part is located at the second horizontal segment.
In an embodiment of the present utility model, there is a predetermined angle α, in advance between first level section and the second horizontal segment Determine angle α between 170 ° to 180 °.
Preferably, horizontal segment entirety is in substantially a straight line.
In an embodiment of the present utility model, the 3rd horizontal section length is between 100m to 200m.
In an embodiment of the present utility model, vertical section is provided with PE pipe or glass reinforced plastic pipe.
In an embodiment of the present utility model, turn section is provided with PE pipe or glass reinforced plastic pipe.
In an embodiment of the present utility model, horizontal segment is provided with PE screen casing or fiberglass screen casing.
In an embodiment of the present utility model, mill off forged in advance by the sleeve pipe of the corresponding horizontal main shaft position of the second straight well.
In an embodiment of the present utility model, mill off forged in advance by the sleeve pipe of the corresponding horizontal main shaft position of the 3rd straight well.
In an embodiment of the present utility model, the position that the second straight well corresponds to horizontal segment is provided with connecting elements, supplies Horizontal segment wears connection.
Preferably, being provided with transition interlayer between horizontal segment and connecting elements, transition interlayer is made using elastic material, mistake Cross interlayer and be bonded in connecting elements.So as to preventing from vibrating the collision leading to.
(3) beneficial effect
The beneficial effects of the utility model are:Coal bed gas well of the present utility model not only effectively raises space utilization Rate, substantially increases the gas production of whole region, more effectively can utilize resource, decrease applying of horizontal well ground preliminary work for spudding Work amount and wellbore construction amount and removal charge, have saved cost.Coal bed gas well of the present utility model is except increased each coal bed gas The inter-well interference of well, simultaneously as dock in the drilling process of second, third two mouthfuls of straight wells to coal in the horizontal segment of horizontal main shaft The change of layer original reservoir stress, also substantially increases the permeability in coal seam, is conducive to desorbing, diffusion and the migration of coal bed gas, Release for coal seam inside coal bed gas creates good condition, increased the recovery ratio of coal bed gas.In addition, the construction of later stage mining In, during well workover, two mouthfuls of straight wells can successively set up circulation, and well-flushing is more fully and thoroughly.
Brief description
Fig. 1 is the schematic diagram of the integral level projection structure of coal bed gas well of this utility model first embodiment;
Fig. 2 is the overall structure diagram of the coal bed gas well of this utility model first embodiment;
Fig. 3 is the cutting structural representation of the coal bed gas well of this utility model first embodiment.
【Description of reference numerals】
1:First straight well;
2:Second straight well;
3:3rd straight well;
4:Horizontal main shaft;
41:Vertical section;
42:Turn section;
43:Horizontal segment;
431:First level section;
432:Second horizontal segment;
433:3rd horizontal segment;
5:Horizontal branch well.
Specific embodiment
In order to preferably explain this utility model, in order to understand, below in conjunction with the accompanying drawings, by specific embodiment, right This utility model is described in detail.
Referring to Fig. 1, Fig. 2 and Fig. 3, this utility model first embodiment multi-branched horizontal well had based on straight well transformation The coal bed gas well of system, it includes:
The first straight well 1, the second straight well 2 and the 3rd straight well 3 setting gradually;
Multi-lateral horizontal well system, including horizontal main shaft 4 and some horizontal branch wells 5, horizontal main shaft 4 includes being sequentially connected Vertical section 41, turn section 42 and horizontal segment 43, vertical section 41 is made up of the top of the first straight well 1, and turn section 42 is by vertical section 41 side window stretches out, and horizontal segment 43 includes first level section 431, the second horizontal segment 432 and the 3rd level being sequentially connected Section 433, first level section 431 one end connects turn section 42, and the other end connects with the second straight well 2, the second horizontal segment 432 one end and Second straight well 2 connects, and the other end is connected with the 3rd straight well 3, and the 3rd horizontal segment 433 is connected with the 3rd straight well 3.
By the setting of said structure, not only effectively raise space availability ratio, substantially increase the product of whole region Tolerance, more can effectively utilize resource, decrease construction volume and wellbore construction amount and the compensation for removal of horizontal well ground preliminary work for spudding With having saved cost.Except increased the inter-well interference of each coal bed gas well, simultaneously as the horizontal segment 43 in horizontal main shaft 4 is right Connect the change to coal seam prime stratum stress in the drilling process of second, third two mouthfuls of straight wells, also substantially increase oozing of coal seam Rate, is conducive to desorbing, diffusion and the migration of coal bed gas thoroughly, is that the release of the internal coal bed gas in coal seam creates good condition, increases The recovery ratio of coal bed gas.
Wherein, located at first level section 431, another part is located at the second level for the part in some horizontal branch wells 5 Section 432.
Wherein, there is between first level section 431 and the second horizontal segment 432 a predetermined angle α, predetermined angle α between Between 170 ° to 180 °.
Preferably, horizontal segment 43 entirety is in substantially a straight line.
As shown in figure 3, horizontal segment 43 can be an entirety, i.e. first level section 431, the second horizontal segment 432 and the 3rd Do not separate between horizontal segment 433.
Wherein, the 3rd horizontal segment 433 length is between 100m to 200m.
Wherein, vertical section 41 is provided with PE pipe or glass reinforced plastic pipe.
Wherein, turn section 42 is provided with PE pipe or glass reinforced plastic pipe.
Wherein, horizontal segment 43 is provided with PE screen casing or fiberglass screen casing.
Wherein, mill off forged in advance by the sleeve pipe of corresponding horizontal main shaft 4 position of the second straight well 2.
Wherein, mill off forged in advance by the sleeve pipe of corresponding horizontal main shaft 4 position of the 3rd straight well 3.
In an embodiment of the present utility model, the position that the second straight well 2 corresponds to horizontal segment 43 is provided with connecting elements, Wear connection for horizontal segment 43.
Specifically, connecting elements has four connecting interfaces and some openings, and wherein, four connecting interfaces are two-by-two relatively Setting, two connecting interfaces of a pair of opposing connect upper semisection and the lower semisection of the second straight well 2 respectively, and second to relatively Two connecting interfaces of setting connect first level section 431 and second horizontal segment 432 of horizontal segment 43 respectively, and some openings include Triangle open mouth and rounded triangle opening.
Wherein, the PE screen casing of horizontal segment 43 or fiberglass screen casing wear and are supported in connecting elements, preferably, horizontal segment 43 PE screen casing or fiberglass screen casing and connecting elements between be provided with transition interlayer, transition interlayer is made using elastic material, such as Rubber, transition interlayer is bonded in connecting elements.
During application, this utility model can implement (so that existing straight well is transformed as a example illustrating) as follows:
Step 1, is analyzed to the well history data and creation data of existing straight well first, and collects other of relevant range Geologic information, preferably suitable three mouthfuls of straight wells, set up threedimensional model;
Step 2, in selected target area, determines pre-transformation for the first of the vertical section 41 of multi-lateral horizontal well system Straight well 1 and another two mouthfuls of second straight wells 2 being used for docking and the 3rd straight well 3, for example, select a bite straight well of distalmost end as first Straight well 1, the coordinate of each well head of repetition measurement, make design;
Step 3, using existing casing firing milling technology, by the sleeve pipe forging of the target coal seam section of two mouthfuls of straight wells being used for docking Mill off, forging milling after the completion of, under enter RMRS instrument (i.e. Rotary Magnetic Ranging System, rotary magnetic range finding system System), survey data, determine that the magnetic disturbance of target phase does not affect later stage docking construction, forging milling success, measure the hole deviation number of straight well in passing According to, know the wellbore trajectory of straight well move towards data (note:The length of sleeve pipe milling determines according to the requirement of docking instrument RMRS);
Step 4, carries out casing sidetracking operation to the vertical section 41 transformed by the first straight well 1, after first setting angle, Start windowing task, start horizontal well operations afterwards, after windowing, window must be repaiied, it is to avoid the generation of trip-out accident;
Step 5, starts horizontal main shaft 4 inclination section construction, gets hold of rate of over-all angle change, select suitable landing point, and Angle during land;
Step 6, the construction of horizontal segment 43, main after objective Shi Xian branch, go forward hand in hand, work progress designs branch Leave angle, should prevent coal seam from collapsing during horizontal segment 43 construction and cause the accidents such as bit freezing, burying;
Step 7, connects for the first time, during 2 remaining 100 meters about of distance the second straight well, enters strong magnetic joint under trip-out, and simultaneously the Enter RMRS instrument under two straight wells 2, start to connect operation;
Step 8, after connection completes for the first time, seals the well head of the second straight well 2, beginning the second horizontal segment 432 is constructed and (applied Work method is referring to step 6);
Step 9, the second horizontal segment 432 apart from remaining 100 meters of target spot when, start to connect operation that (construction method is referring to step 7), after the completion of connection, continue construction, then beat about 100-200 rice, finishing drilling;
Step 10, after finishing drilling, fully cleans horizontal branch well 5 with mud cleans agent solution, removes mud in drilling process Pollution (the note that coal surface is caused:Scavenging period is no less than 8 hours), under horizontal main shaft 4, then enter PE screen casing support Coal seam, completion;
Step 11, will enter to carry out mining (note in two mouthfuls of straight wells of docking under conventional mining equipment:The mining initial stage notes controlling The speed that liquid level declines).
In sum, coal bed gas well of the present utility model not only effectively raises space availability ratio, substantially increases whole The gas production in individual region, more can effectively utilize resource, decrease construction volume and the wellbore construction of horizontal well ground preliminary work for spudding Amount and removal charge, have saved cost.Coal bed gas well of the present utility model is except increased the inter-well interference of each coal bed gas well, same When, because the horizontal segment in horizontal main shaft docks in the drilling process of second, third two mouthfuls of straight wells to coal seam prime stratum stress Change, also substantially increase the permeability in coal seam, be conducive to desorbing, diffusion and the migration of coal bed gas, be the internal coal seam in coal seam The release of gas creates good condition, increased the recovery ratio of coal bed gas.In addition, in the construction of later stage mining, during well workover, two mouthfuls straight Circulation can successively be set up by well, and well-flushing is more fully and thoroughly.

Claims (10)

1. a kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation is it is characterised in that it includes:
The first straight well, the second straight well and the 3rd straight well setting gradually;
Multi-lateral horizontal well system, including horizontal main shaft and some horizontal branch wells, it is vertical that horizontal main shaft includes being sequentially connected Section, turn section and horizontal segment, vertical section is made up of the top of the first straight well, and turn section is stretched out by the side window of vertical section, water Flat section includes first level section, the second horizontal segment and the 3rd horizontal segment being sequentially connected, and first level section one end connects turn section, The other end is connected with the second straight well, and second horizontal segment one end is connected with the second straight well, and the other end is connected with the 3rd straight well, the 3rd water Flat section is connected with the 3rd straight well.
2. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:, located at first level section, another part is located at the second horizontal segment for a part in some horizontal branch wells.
3. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:There is between first level section and the second horizontal segment a predetermined angle α, predetermined angle α is between 170 ° to 180 °.
4. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 3, its feature exists In:Horizontal segment is overall to be in substantially a straight line.
5. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:3rd horizontal section length is between 100m to 200m.
6. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:Vertical section and/or turn section are provided with PE pipe or glass reinforced plastic pipe.
7. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:Horizontal segment is provided with PE screen casing or fiberglass screen casing.
8. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:Mill off forged in advance by the sleeve pipe of the second straight well and/or the corresponding horizontal main shaft position of the 3rd straight well.
9. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 1, its feature exists In:The position that second straight well corresponds to horizontal segment is provided with connecting elements, wears connection for horizontal segment.
10. the coal bed gas well with multi-lateral horizontal well system based on straight well transformation as claimed in claim 9, its feature exists In:It is provided with transition interlayer, transition interlayer is made using elastic material, and transition interlayer is bonded between horizontal segment and connecting elements Connecting elements.
CN201621033008.9U 2016-08-31 2016-08-31 A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation Active CN206000529U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
CN110185389A (en) * 2019-05-05 2019-08-30 重庆城开能源有限公司 A kind of discarded deeps mines well Geothermal Exploitation and Utilization system and method
CN110306965A (en) * 2019-07-08 2019-10-08 河南理工大学 A kind of method for increasing for coal bed gas low yield wellblock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
CN110185389A (en) * 2019-05-05 2019-08-30 重庆城开能源有限公司 A kind of discarded deeps mines well Geothermal Exploitation and Utilization system and method
CN110306965A (en) * 2019-07-08 2019-10-08 河南理工大学 A kind of method for increasing for coal bed gas low yield wellblock

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