CN205936571U - Raising output is transformed and novel coal seam gas well of formation to old well - Google Patents

Raising output is transformed and novel coal seam gas well of formation to old well Download PDF

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Publication number
CN205936571U
CN205936571U CN201620945876.8U CN201620945876U CN205936571U CN 205936571 U CN205936571 U CN 205936571U CN 201620945876 U CN201620945876 U CN 201620945876U CN 205936571 U CN205936571 U CN 205936571U
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well
straight
wells
horizontally
straight well
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董文奎
杨凡
王子卫
魏江卓
何晓飞
李艳龙
夏雪平
李平
张建军
刘云聪
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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

The utility model relates to a raising output is transformed and novel coal seam gas well of formation to old well, it includes: a plurality of straight wells, the straight well pressure of each straight well falls the region and separates each other noninterference each other, and a plurality of horizontal abutting -joint wells, every horizontal abutting -joint wells's horizontal well pressure falls regional straight well pressure with a plurality of straight wells and falls the regional cross interference of formation, wherein, at least one horizontal abutting -joint wells is including the vertical section that connects gradually, slope section and horizontal segment, vertical section forms the sleeve pipe replacement of original straight well for the cement cap, the slope section is outwards extended by the punchhole that pierces through the cement cap, the horizontal segment is extended to by the slope section and communicates with another straight well. Establish ties many mouthfuls of straight wells with the help of horizontal abutting -joint wells, increase well interference, form whole the step -down, improved regional gas production, simultaneously, changed the original stratum stress in coal seam, improved the permeability in coal seam, do benefit to desorption, diffusion and the migration of coal bed gas, created good condition for the release of coal seam inside coal bed gas, increased the recovery ratio of coal bed gas.

Description

A kind of new coal bed gas well that old well storey increase design is formed
Technical field
This utility model belongs to the mining of coal bed gas technical field in unconventional energy resource exploration and development, especially relates to A kind of new coal bed gas well, is particularly well-suited to the gas ground pump drainage coal bed gas in old well transformation and high methane hypotonicity coal seam Exploitation.
Background technology
In coal seam contain substantial amounts of device in Gas, the past it be huge potential safety hazard in process of coal mining, but, with The development of device in Gas ground extraction technique, device in Gas is becoming a kind of valuable clean energy resource, and increasing company starts From this resource of Ground Developing, so the substantial amounts of straight well from ground extraction coal bed gas is done.China's coalbed methane ground extraction Technology, majority has used for reference the U.S., the vertical well fracture production technique of the state such as Canadian and Australian, but, due to by China The impact of coal seam hypotonicity geological conditions, cannot set up inter-well interference between each straight well, but each independent exploitation, therefore, greatly The gas production of part 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), and substantial amounts of fund is put into postprecipitation on these wells.In order to vitalize These coal bed gas wells, we transform to these old wells on the basis of making full use of original well, so that them is played due Economic benefit.
Utility model content
(1) technical problem to be solved
In order to solve the problems referred to above of prior art, this utility model provide a kind of old well storey increase design is formed new Type coal bed gas well, many mouthfuls of straight wells can be connected by it, increases inter-well interference, forms overall blood pressure lowering, thus reaching raising area The purpose of domain 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 new coal bed gas well that old well storey increase design is formed, it includes:
Some straight wells, the straight well pressure drop region of each straight well is separated from one another not to be interfere with each other, and some horizontally-butted wells, each The horizontal well pressure drop region of horizontally-butted wells forms cross interference wherein with the straight well pressure drop region of multiple straight wells, at least one water Flat butt shaft includes vertical section, tilting section and the horizontal segment being sequentially connected, and vertical section is that the sleeve pipe of straight well is replaced with hanging water The bod forms, and tilting section is stretched out by the eyelet penetrating cement cap, and horizontal segment is extended to and another straight well by tilting section Connection.
By the setting of said structure, many mouthfuls of straight wells can be connected, that is, pressure drop region intersects, increase between well whereby Interference, forms overall blood pressure lowering, thus improving region gas production.
In an embodiment of the present utility model, the horizontal segment edge of horizontally-butted wells is prolonged perpendicular to coal seam major fracture direction Stretch.
In an embodiment of the present utility model, the horizontal segment of horizontally-butted wells is extended to by tilting section after being connected with straight well Continue to extend to and penetrate this straight well predetermined length.
Preferably, this predetermined length is no less than 5 meters.
Wherein, the sleeve pipe of this straight well offers connection eyelet in advance, and the horizontal segment connection for horizontally-butted wells penetrates.
Preferably, being provided with block part between the connection eyelet of horizontal segment and straight well, block part includes internal layer cement, outer layer Cement and pour in glass epoxy therebetween, glass epoxy is wave-shape board, is provided with some through holes, and through hole is in by ripple The strip that the crest of wave-like extends to trough.
In an embodiment of the present utility model, horizontally-butted wells include horizontal branch well.
Wherein, horizontal branch well extends in the pressure drop region of straight well.
Preferably, horizontal branch well extends along perpendicular to coal seam major fracture direction.
Wherein, in coal seam of length no more than 800 ± 50 meters of horizontal branch well.
In an embodiment of the present utility model, the horizontal well pressure drop region of horizontally-butted wells and the straight well pressure drop area of straight well Domain formed cross interference include following in any one or appoint several structures:
Structure one, horizontally-butted wells extend in the straight well pressure drop region of straight well;
Structure two, straight well are located in the horizontal well pressure drop region of horizontally-butted wells;
Structure three, horizontal branch well extend in the straight well pressure drop region of straight well.
In an embodiment of the present utility model, the horizontal segment of horizontally-butted wells is provided with fiberglass screen casing.
In an embodiment of the present utility model, the horizontal segment of horizontally-butted wells is provided with PE screen casing.
In an embodiment of the present utility model, the vertical section of horizontally-butted wells and tilting section are provided with glass reinforced plastic pipe.
In an embodiment of the present utility model, the vertical section of horizontally-butted wells and tilting section are provided with PE pipe.
In an embodiment of the present utility model, the tilting section of horizontally-butted wells is provided with sleeve pipe and PE pipe or fiberglass Pipe, wherein, PE pipe or glass reinforced plastic pipe are sheathed in sleeve pipe.
Wherein, it is provided with decompression device in horizontally-butted wells and/or straight well.
(3) beneficial effect
The beneficial effects of the utility model are:The new coal bed gas that old well storey increase design is formed of the present utility model Well, due to many mouthfuls of straight wells being together in series by horizontally-butted wells, be increased inter-well interference, not only makes the horizontally-butted wells newly boring Aerogenesis, also increases the gas production of periphery other straight well, forms overall blood pressure lowering simultaneously, thus reached improving region gas production Technique effect, simultaneously as the change to coal seam prime stratum stress in the drilling process of horizontally-butted wells, also greatly improves The permeability in coal seam, 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 well Condition, increased the recovery ratio of coal bed gas, in addition, this setup of horizontally-butted wells, construction volume is few, and cost is relatively low.
Brief description
Fig. 1 is the attachment structure schematic diagram () of the straight well in one embodiment of this utility model and horizontally-butted wells;
Fig. 2 is the attachment structure schematic diagram (two) of the straight well in one embodiment of this utility model and horizontally-butted wells;
Fig. 3 is the overall structure diagram of one embodiment of this utility model.
【Description of reference numerals】
1st, 1 ', 1 ' ':Straight well;
2:Horizontally-butted wells;
20:Tilt sleeve;
21:Vertical section;
22:Tilting section;
23:Horizontal segment;
24:PE pipe or glass reinforced plastic pipe;
25:PE screen casing or fiberglass screen casing;
3:Straight well pressure drop region;
4:Horizontal well pressure drop region;
5:Major fracture direction;
6:Horizontal branch well;
a、b:The length of side;
h1、h2:Distance.
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, the coal bed gas well of one embodiment of this utility model, it has:
Some straight wells 1,1 ', 1 ' ', each straight well 1,1 ', 1 ' ' straight well pressure drop region 3 separated from one another do not interfere with each other, Yi Jiruo Dry horizontally-butted wells 2, horizontal well pressure drop region 4 and multiple straight wells 1,1 ', the straight well pressure drop area of 1 ' ' of each horizontally-butted wells 2 Domain 3 forms cross interference, and wherein, at least one horizontally-butted wells 2 includes vertical section 21, tilting section 22 and the level being sequentially connected Section 23, vertical section 21 is the sleeve pipe of original straight well 1 ' to be replaced with cement cap form, and tilting section 22 is by penetrating hanging cement The eyelet of plug stretches out, and tilting section 22 is provided with tilt sleeve 20, and horizontal segment 23 is extended to straight well 1 even by tilting section 22 Logical.
By the setting of said structure, can intersect by pressure drop region and many mouthfuls of straight wells 1,1 ', 1 ' ' are together in series, borrow This increases inter-well interference, forms overall blood pressure lowering, thus improving region gas production.
It is additionally, since the change to coal seam prime stratum stress in the drilling process of horizontally-butted wells 2, also greatly improve The permeability in coal seam, 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 well Condition, increased the recovery ratio of coal bed gas.
Wherein, the horizontal segment 23 of horizontally-butted wells 2 extends along perpendicular to coal seam major fracture direction 5.So as to ensureing aerogenesis On the premise of amount, reduce construction volume, the utilization rate of butt shaft 2 of improving the standard.
The horizontal segment 23 of horizontally-butted wells 2 extended to by tilting section 22 connect with straight well 1 follow-up renew to extend penetrate straight well 1 Predetermined length.Wherein, this predetermined length is not less than 5 meters.
Wherein, straight well 1 offers connection eyelet in advance, and horizontal segment 23 connection for horizontally-butted wells 2 penetrates, for example, can To be removed the sleeve pipe of straight well 1 using forging milling tool, when to creep into horizontal segment 23, can directly to creep into, and then make level Section 23 connection penetrates straight well 1.
Wherein, in order to improve factor of created gase, reduce construction volume, horizontally-butted wells 2 are preferably provided with horizontal branch well 6 (ginseng See Fig. 2).
Wherein, horizontal branch well 6 extends in the straight well pressure drop region 3 of straight well 1,1 ', 1 ' ' so that horizontally-butted wells 2 can To communicate with more straight well pressure drop regions 3.This setup of horizontally-butted wells 2, the pressure of butt shaft 2 of can improving the standard Fall regional extent, decreases construction volume, reduces cost.
Preferably, horizontal branch well 6 extends along perpendicular to the direction of coal seam major fracture 5, expand horizontally-butted wells 2 to exist The horizontal well pressure drop region 4 that side is formed.
Wherein, in coal seam of length no more than 800 ± 50 meters of horizontal branch well 6.
Preferably, horizontally-butted wells 2 are arranged along the direction that coal seam has a down dip, to improve factor of created gase.
Wherein, the horizontal well pressure drop region 4 of horizontally-butted wells 2 and the straight well pressure drop region 3 of straight well 1,1 ', 1 ' ' form friendship Fork interference includes following in any one or times several structures:
Structure one, horizontally-butted wells 2 extend in the straight well pressure drop region 3 of straight well 1,1 ', 1 ' ';
Structure two, straight well 1,1 ', 1 ' ' are located in the horizontal well pressure drop region 4 of horizontally-butted wells 2;
Structure three, horizontal branch well 6 extend in the straight well pressure drop region 3 of straight well 1,1 ', 1 ' '.
In a preferred embodiment of the present utility model, one end of horizontally-butted wells 2 is directly connected with straight well 1 or straight well 1 ' Or two ends are directly connected with straight well 1, straight well 1 ' respectively, the horizontal branch well 6 of horizontally-butted wells 2 extends to the straight well of straight well 1 ' ' In pressure drop region 3.
In an embodiment of the present utility model, the horizontal segment 23 of horizontally-butted wells 2 is provided with fiberglass screen casing.
In an embodiment of the present utility model, the horizontal segment 23 of horizontally-butted wells 2 is provided with PE screen casing.
In an embodiment of the present utility model, the vertical section of horizontally-butted wells 2 and tilting section are provided with PE pipe.
In an embodiment of the present utility model, the vertical section of horizontally-butted wells 2 and tilting section are provided with glass reinforced plastic pipe.
In an embodiment of the present utility model, the tilting section of horizontally-butted wells is provided with sleeve pipe and PE pipe or fiberglass Pipe, wherein, PE pipe or glass reinforced plastic pipe are sheathed in sleeve pipe.
In an embodiment of the present utility model, in straight well 1,1 ', 1 ' ', it is provided with decompression device.
Preferably, straight well 1,1 ', 1 ' ' include producing straight well and branch's straight well, horizontally-butted wells 2 directly connect with producing straight well Logical, branch's straight well is connected with the horizontal branch well 6 of horizontally-butted wells 2 or horizontal branch well 6 extends to the pressure drop area of branch's straight well In domain.Whereby, pressure reducing device is arranged at production straight well.
Pressure reducing device can also be arranged in horizontally-butted wells 2.Or in straight well 1,1 ', 1 ' ' and horizontally-butted wells 2 all Setting pressure reducing device.
Wherein, single straight well 1,1 ', 1 ' ' pressure drop region 3 can be with ovalize, for example single straight well 1,1 ', the pressure of 1 ' ' The ellipse that fall region 3 can extend along coal seam major fracture direction 5 in major axis, 45 ° of north by east as shown in Figure 1.
Referring to Fig. 3, in an embodiment of the present utility model, can in the predetermined areas of a × b, be provided with m × N mouth straight well 1,1 ', 1 ' ', be arranged between adjacent straight well 1,1 ', 1 ' ' predetermined apart from h1, h2, and the horizontal saliva of m-1 or n-1 mouth be set put down Connect well, each straight well 1,1 ', 1 ' ' are connected.For example:In embodiment shown in Fig. 3, in the presumptive area model of 1000m × 1000m In enclosing, it is provided with 4 × 4 mouthfuls of straight wells 1,1 ', 1 ' ', is arranged to the distance of 300 ± 45m between adjacent straight well 1,1 ', 1 ' ', and arranges 3 Saliva flushconnection well, each straight well 1,1 ', 1 ' ' are connected.
Straight well in coal bed gas well of the present utility model, both can be newly-built straight well or original straight well, that is, Say, can be transformed by way of horizontally-butted wells are set up to existing straight well, so as to improving its gas production and recovery ratio.
During application, coal bed gas well of the present utility model, can implement as follows (taking transform existing straight well as a example to say Bright):
1st, Drilling Design is made with the coordinate of straight well to be connected and coal seam depth according to horizontal well to be built;
2nd, whether original straight well 1 ' to horizontal well to be built and straight well 1 to be connected drifting respectively, drill through down in inspection shaft Freely;
3rd, original straight well 1 ' of horizontal well to be built and straight well 1 to be connected survey sound width respectively, horizontal well to be built original straight Well 1 ' finds old casing section hoop position, and local in distance section hoop position 5m selects forging milling point;Straight well 1 to be connected is in connection Point position carries out forging milling;
4th, enter to forge milling tool under to carry out forging milling;
5th, after original straight well 1 ' forging milling success of horizontal well to be built, pull out sleeve pipe, play sleeve pipe;
6th, horizontal cementing, squeezes into cement cap, waits solidifying 48 hours;
7th, lower brill, sidetracking, start directional inclination, after reaching landing point, pull out of hole;
8th, enter tilt sleeve 20 under, well cementation, wait solidifying 36 hours;
9th, lower brill, start drilling in coal, using degradation mud system in drilling process, coal seam section drilling preset distance with After straight well 1 connection, continue drilling predetermined length, drilling terminates;
10th, use clear water huge discharge circulation well cleanup;
11st, enter PE pipe or glass reinforced plastic pipe under vertical section 21 and tilting section 22, enter PE screen casing or glass under horizontal segment 23 Steel screen casing;
12nd, completion.
Whereby, coal bed gas well of the present utility model can make full use of original straight well, on the well site of original straight well, adopts Level docks the mode of drilling well, gets out corresponding horizontally-butted wells in the middle of straight well, and the docking of original straight well, then, simultaneously Mining is carried out to horizontal well and straight well, makes the pressure drop region series of horizontal well play the pressure drop region of each single straight well, therefore each straight Corresponding inter-well interference is set up to reach the effect of overall blood pressure lowering, thus greatly improving the gas production of whole region between well.Separately Outward, except increased the inter-well interference of each coal bed gas well, region entirety blood pressure lowering is made to be possibly realized, simultaneously as in level docking Change to coal seam prime stratum stress in the drilling process of well, also substantially increases the permeability in coal seam, is conducive to coal bed gas Desorbing, diffusion and migration, be that the release of the internal coal bed gas in coal seam creates good condition, increased the recovery ratio of coal bed gas.
In sum, coal bed gas well of the present utility model, because the design of horizontally-butted wells is so as to can be by many mouthfuls of straight wells It is together in series, increased inter-well interference, form overall blood pressure lowering, thus having reached the technique effect improving region gas production, meanwhile, Due to the change to coal seam prime stratum stress in the drilling process of horizontally-butted wells, also substantially increase 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.

Claims (10)

1. a kind of new coal bed gas well that old well storey increase design is formed, it includes some straight wells (1,1 ', 1 "), each straight well (1,1 ', the straight well pressure drop region (3) of 1 ") separated from one another do not interfere with each other it is characterised in that it also includes:
Some horizontally-butted wells (2), the horizontal well pressure drop region (4) of each horizontally-butted wells (2) and multiple straight well (1,1 ', 1 ") Straight well pressure drop region (3) formed cross interference,
Wherein, at least one horizontally-butted wells (2) inclusion is sequentially connected vertical section (21), tilting section (22) and horizontal segment (23), vertical section (21) is the sleeve pipe of straight well (1 ') to be replaced with cement cap form, and tilting section (22) is by penetrating hanging water The eyelet of the bod stretches out, and horizontal segment (23) is extended to by tilting section (22) and connected with straight well (1).
2. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:
The horizontal segment (23) of horizontally-butted wells (2) extends along perpendicular to coal seam major fracture direction (5).
3. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:
Horizontal segment (23) extended to by tilting section (22) connect with straight well (1) follow-up renew to extend penetrate straight well (1) predetermined length, This predetermined length is not less than 5 meters.
4. the new coal bed gas well that as claimed in claim 3 old well storey increase design formed it is characterised in that:Straight well (1) Sleeve pipe offer connection eyelet in advance, for horizontally-butted wells (2) horizontal segment connection penetrate.
5. the new coal bed gas well that as claimed in claim 4 old well storey increase design formed it is characterised in that:Horizontal segment (23) it is provided with block part and the connection eyelet of straight well (1) between, block part includes internal layer cement, outer layer cement and pours in two Glass epoxy between person, glass epoxy is wave-shape board, is provided with some through holes, and through hole is in from wavy crest to ripple The strip that paddy extends.
6. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:
Horizontally-butted wells include horizontal branch well (6).
7. the new coal bed gas well that as claimed in claim 6 old well storey increase design formed it is characterised in that:Level is docked The horizontal well pressure drop region (4) of well (2) and straight well (1,1 ', the straight well pressure drop region (3) of 1 ") formed cross interference include following In any one or appoint several structures:
Structure one, horizontally-butted wells (2) extend to straight well (in 1,1 ', the straight well pressure drop region (3) of 1 ");
(1,1 ', 1 ") are located in the horizontal well pressure drop region (4) of horizontally-butted wells (2) for structure two, straight well;
Structure three, horizontal branch well (6) extend to straight well (in 1,1 ', the straight well pressure drop region (3) of 1 ").
8. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:Level is docked The horizontal segment of well (2) is provided with PE screen casing or fiberglass screen casing.
9. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:
The vertical section of horizontally-butted wells (2) and/or tilting section are provided with PE and manage or glass reinforced plastic pipe, and/or horizontally-butted wells (2) Tilting section is provided with sleeve pipe,
Wherein, when the tilting section of horizontally-butted wells (2) is provided with sleeve pipe with PE pipe or glass reinforced plastic pipe simultaneously, PE manages or fiberglass Pipe box is in sleeve pipe.
10. the new coal bed gas well that as claimed in claim 1 old well storey increase design formed it is characterised in that:Level pair Connect well (2) and/or straight well (is provided with decompression device in 1,1 ', 1 ").
CN201620945876.8U 2016-08-25 2016-08-25 Raising output is transformed and novel coal seam gas well of formation to old well Active CN205936571U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN111905906A (en) * 2020-07-29 2020-11-10 中国石油化工股份有限公司 Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN111905906A (en) * 2020-07-29 2020-11-10 中国石油化工股份有限公司 Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof
CN111905906B (en) * 2020-07-29 2021-07-06 中国石油化工股份有限公司 Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof

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