CN213478312U - Thick coal seam vertical well modified horizontal well drainage and production structure - Google Patents
Thick coal seam vertical well modified horizontal well drainage and production structure Download PDFInfo
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- CN213478312U CN213478312U CN202021751305.3U CN202021751305U CN213478312U CN 213478312 U CN213478312 U CN 213478312U CN 202021751305 U CN202021751305 U CN 202021751305U CN 213478312 U CN213478312 U CN 213478312U
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Abstract
The utility model provides a structure is adopted to horizontal well row that thick coal seam vertical shaft reforms transform, including the vertical well, horizontal well group and ground device, horizontal well group includes horizontal well a, horizontal well b, horizontal well c and horizontal well d, constitute by making oblique section and horizontal segment respectively, the horizontal axis of the horizontal segment wall of a well is provided with horizontal shooting hole mouth equidistantly, horizontal well a horizontal segment is provided with vertical shooting hole mouth equidistantly with horizontal well b horizontal segment wall of a well vertical axis bottom equidistantly, horizontal well c horizontal segment is provided with vertical shooting hole mouth equidistantly with horizontal well d horizontal segment wall of a well vertical axis top also, vertical well wall of a well bottom is provided with the vertical shooting hole mouth of a well of symmetry. The system constructs a horizontal well group on the basis of the existing vertical well, and connects a horizontal crack network, a vertical crack network and cracks around the vertical well to form a three-dimensional crack network which is widely distributed on a plane and is communicated with each other in the vertical direction, so that the recovery ratio of the coal bed gas resources of the thick coal bed can be improved.
Description
Technical Field
The utility model relates to a coal bed gas develops technical field, concretely relates to horizontal well row of improving of thick coal seam vertical shaft adopts structure.
Background
The reserves of conventional natural gas in China are relatively insufficient, rich coal, lean oil and little gas are realistic conditions which have to be faced, along with the breakthrough of unconventional natural gas in a plurality of countries in the world, China also pays more and more attention to the exploration and development of unconventional natural gas, and through the development of nearly 30 years, the coal bed gas industry in China is from the inexistence to the existence, and the development is profound, so that the method has great effects on energy strategic safety and energy structure optimization in China.
China has rich coal resources, resource conditions for developing coal bed gas on a large scale, various coal reservoirs, and widely distributed coal reservoirs with characteristics of different coal levels, different structural conditions, different thicknesses and the like. Therefore, development schemes are designed according to the actual conditions of the coal reservoir in a targeted manner when coal bed gas resources are developed and utilized.
The thick coal seam of the utility model is a coal seam with a thickness of 3.5-8 m. For thick coal seams with large coal thickness and even ultra-thick coal seams, although various development modes including a vertical well, a directional well, a horizontal well, a U-shaped well and the like exist, the existing development modes can only release part of the productivity of the thick coal seams, so that the recovery rate is low, and the industrial development is not facilitated. In addition, the vertical well is a well type generally selected for coal bed gas exploration and development at present, the influence range of a single well is relatively small, the gas production is reduced after a period of drainage and production, the well has to be shut down, and the coal bed gas developer is not economical. Based on the design, the design and implementation of the horizontal well drainage and production structure for improving the utilization rate of the existing coal bed gas vertical well and fully releasing the coal bed gas resource amount in the thick coal bed have important significance.
SUMMERY OF THE UTILITY MODEL
Based on the problem, the utility model provides a structure is adopted to thick coal seam vertical shaft transformation horizontal well row solves the problem that the low yield vertical shaft is forced the low, the unable abundant release of thick coal seam productivity of the rate of return on investment that leads to of shutting down the well under the prior art condition.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a structure is adopted to horizontal well row that thick coal seam vertical well reforms transform, includes vertical well, horizontal well group and ground device, horizontal well group comprises a plurality of horizontal wells, a plurality of horizontal wells comprise by making inclined section and horizontal segment, make inclined section with the vertical well links to each other at the side drilling point department, the horizontal axis both sides of the horizontal segment wall of a well are provided with horizontal shooting hole mouth, the vertical axis of the horizontal segment wall of a well is provided with vertical shooting hole mouth.
Furthermore, the horizontal shooting holes are distributed on the horizontal section at equal intervals, and the vertical shooting holes are distributed on the horizontal section at equal intervals.
Furthermore, the horizontal well has four sections, namely a horizontal well a, a horizontal well b, a horizontal well c and a horizontal well d, which are arranged on the lateral surface of the vertical well.
Furthermore, the horizontal sections are all located inside the thick coal seam, the drilling direction of the horizontal sections is parallel to the trend direction of the coal seam, the horizontal sections of the horizontal well a and the horizontal well b are located at the middle upper part of the coal seam, and the horizontal sections of the horizontal well c and the horizontal well d are located at the bottom of the coal seam.
Furthermore, vertical shooting orifices are formed in the horizontal section of the horizontal well a and the horizontal section of the horizontal well b at equal intervals in the downward direction at the bottoms of the vertical axes of the well walls, and vertical shooting orifices are also formed in the horizontal section of the horizontal well c and the horizontal section of the horizontal well d at equal intervals in the upward direction at the tops of the vertical axes of the well walls.
Furthermore, symmetrical straight well shooting orifices are arranged at the bottom of the well wall of the straight well.
Further, the top end of the vertical well is connected with a surface device at the surface through a well mouth.
Furthermore, the interior of the vertical well also comprises an oil pipe and a sucker rod, and the bottom ends of the oil pipe and the sucker rod are connected with an extraction pump.
Furthermore, the distance between two adjacent vertical perforation openings is 2-5 times of the distance between two adjacent horizontal perforation openings.
Has the advantages that:
when the thick coal seam vertical well is used for transforming a horizontal well drainage and production structure, the existing vertical well drainage and production are utilized, the secondary development of an old well can be realized, and the development efficiency is improved; the vertical well and the horizontal well group share the vertical well shaft, so that a well field of the horizontal well group and a vertical well matched with the horizontal well group do not need to be separately constructed, and the construction cost of a ground well field and the underground drilling cost can be reduced.
The horizontal section of the horizontal well group is provided with horizontal jet orifices at fixed intervals, mesh cracks distributed in a plane can be formed in a coal bed after fracturing, the horizontal section of the horizontal well group is provided with vertical jet orifices at fixed intervals, an upper crack system of a thick coal bed can be communicated with a lower crack system through fracturing, horizontal cracks can be formed at two sides of a vertical well through the vertical jet orifices of the vertical well, the horizontal section c of the horizontal well and the horizontal section d of the horizontal well are communicated with the vertical well to form a uniform seepage network, a drainage pump at the bottom of the vertical well shaft is used for pumping and draining coal bed water in the influence range of the whole drainage system in the coal bed, desorption, diffusion and seepage of adsorbed gas of the thick coal bed are promoted, and the productivity of the gas of the thick coal bed can be fully released.
Drawings
Fig. 1 is a schematic diagram of a drainage and production structure of a vertical well modified horizontal well for a thick coal seam provided by the embodiment.
Wherein: the method comprises the following steps of 1-ground device, 2-well opening, 3-sucker rod, 4-vertical well, 5-oil pipe, 6-lateral drilling point, 7-coal bed, 8-horizontal well group, 8 a-horizontal well a,8 b-horizontal well b, 8 c-horizontal well c, 8 d-horizontal well d, 9-deflecting section, 10-horizontal section, 10 a-horizontal shooting hole opening, 10 b-vertical shooting hole opening, 11-vertical well shooting hole opening and 12-extraction pump.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention.
The embodiment is shown in fig. 1, the utility model provides a horizontal well arrangement and mining structure is reformed transform to vertical well in thick coal seam, including vertical well 4, horizontal well group 8 and ground device 1, horizontal well group 8 includes horizontal well a,8a, horizontal well b, 8b, horizontal well c, 8c and horizontal well d, 8d, horizontal well a,8a, horizontal well b, 8b, horizontal well c, 8c, horizontal well d, 8d, respectively by making skew segment 9 and horizontal segment 10 and constitute, horizontal axis both sides of horizontal segment 10 wall of a well are provided with horizontal shooting orifices 10a at equal intervals, horizontal well a,8a horizontal segment 10 and horizontal well b, 8b horizontal segment 10 wall of a well vertical axis bottom are provided with vertical shooting orifices 10b at equal intervals, horizontal well c, 8c horizontal segment 10 and horizontal well d, 8d horizontal segment 10 vertical wall of a well top are also provided with vertical shooting orifices 10b at equal intervals, and symmetrical straight well shooting holes 11 are formed in the bottom of the wall of the straight well.
The vertical well 4 is connected with the deflecting section 9 of the horizontal well group 8 at the side drilling point 6, the top end of the vertical well 4 is connected with the ground device 1 at the ground surface through the well head 2, the interior of the vertical well 4 also comprises an oil pipe 5 and a sucker rod 3, and the bottom ends of the oil pipe 5 and the sucker rod 3 are both connected with the extraction pump 12.
The distance between two adjacent vertical perforation holes 10b can be set to be 2-5 times of the distance between two adjacent horizontal perforation holes 10a according to the reservoir characteristics and the construction actual requirements.
Considering that hydraulic pressure cracks can be formed through perforation and fracturing when the vertical well 4 is drained and produced, effective seepage channels can be formed by supporting the cracks through fracturing sand, on the basis of statistical data and numerical simulation, the hydraulic pressure cracks with the crack length larger than 100m can be formed on two sides of the vertical well 4 along the perforation hole 11 of the vertical well, and on the basis, the vertical distance between the part, connected with the horizontal section 10, of the deflecting section 9 and the vertical well 4 is controlled within 100 m.
The horizontal sections 10 of the horizontal wells a and 8a and the vertical emitting orifices 10b below the horizontal sections 10 of the horizontal wells b and 8b can form downward vertical cracks in the coal seam 7 through hydraulic fracturing, the horizontal sections 10 of the horizontal wells c and 8c and the vertical emitting orifices 10b above the horizontal sections 10 of the horizontal wells d and 8d can form upward vertical cracks in the coal seam 7 through hydraulic fracturing, and the vertical cracks are communicated with each other and can be used as a channel for coal seam water to seep from top to bottom.
In the embodiment, the vertical well 4 is constructed before the horizontal well group 8, after the vertical well 4 is completed and fractured, the vertical well 4 is drained and mined for a period of time until the reservoir pressure drops to the depletion pressure of the coal bed gas well development, at the moment, the ground device 1 on the wellhead 2 is removed, the horizontal wells a and 8a and the horizontal wells b and 8b are constructed, and then the horizontal wells c and 8c and the horizontal wells d and 8d are constructed. During hydraulic fracturing, fracturing fluid is pressed out from two sides of a well wall along a direction perpendicular to the trend of a shaft at a horizontal perforation port 10a in a horizontal section 10 of a horizontal well group 8, a seepage channel along the horizontal direction is formed in a coal bed 7, the influence range of cracks can be enlarged, and a three-dimensional crack network which is widely distributed on a plane and is communicated with each other in the vertical direction is formed.
In this embodiment, in order to improve the recovery ratio of the coal bed gas in the thick coal bed in the development block, the vertical wells 4 are uniformly arranged in the direction perpendicular to the direction of the coal bed 7, and a series of vertical wells 4 and the horizontal well group 8 form a drainage and production well pattern similar to a fishbone shape, so that the large-scale development of the whole block can be realized.
When the thick coal seam vertical well transformation horizontal well drainage and mining structure provided by the utility model is used, existing vertical wells 4 are used for drainage and mining, secondary development of old wells can be realized, and development efficiency is improved; the vertical well 4 and the horizontal well group 8 share the vertical well 4 shaft, so that the well site of the horizontal well group 8 and the vertical well 4 matched with the horizontal well group 8 do not need to be independently constructed, and the construction cost of a ground well site and the underground drilling cost can be reduced.
The horizontal section 10 of the horizontal well group 8 is provided with horizontal perforation ports 10a at fixed intervals, mesh-shaped cracks distributed in a plane can be formed in the coal seam 7, the horizontal section 10 of the horizontal well group 8 is provided with vertical perforation ports 10b at fixed intervals, the upper crack system of the thick coal seam can be communicated with the lower crack system, the horizontal cracks can be formed on two sides of the vertical well 4 through the vertical perforation ports 11, the horizontal sections 10 of the horizontal wells c and 8c and the horizontal sections 10 of the horizontal wells d and 8d are communicated with the vertical well 4 to form a uniform seepage network, the coal seam water in the whole drainage system influence range in the coal seam 7 is drained by using the drainage pump 12 at the bottom of the vertical well 4, the adsorption, desorption, diffusion and seepage of the thick coal seam are promoted, and the capacity of the thick coal seam gas can be fully released.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
Claims (9)
1. The utility model provides a structure is adopted to horizontal well row that thick coal seam vertical well reforms transform, includes vertical well, horizontal well group and ground device, its characterized in that: the horizontal well group is composed of a plurality of horizontal wells, each horizontal well is composed of an inclined section and a horizontal section, the inclined sections are connected with the vertical wells at the side drilling points, horizontal jet orifices are formed in two sides of the horizontal axis of the horizontal section well wall, and vertical jet orifices are formed in the vertical axis of the horizontal section well wall.
2. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 1, characterized in that: the horizontal shooting orifices are distributed on the horizontal section at equal intervals, and the vertical shooting orifices are distributed on the horizontal section at equal intervals.
3. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 2, characterized in that: the horizontal well comprises four sections, namely a horizontal well a, a horizontal well b, a horizontal well c and a horizontal well d, and is arranged on the lateral surface of the vertical well.
4. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 3, characterized in that: the horizontal sections are located inside the thick coal seam, the drilling direction of the horizontal sections is parallel to the coal seam trend direction, the horizontal sections of the horizontal well a and the horizontal well b are located at the middle upper portion of the coal seam, and the horizontal sections of the horizontal well c and the horizontal well d are located at the bottom of the coal seam.
5. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 4, characterized in that: vertical shooting orifices are formed in the horizontal section of the horizontal well a and the horizontal section of the horizontal well b in an equidistant mode downwards in the bottom of the vertical axis of the well wall, and vertical shooting orifices are formed in the horizontal section of the horizontal well c and the horizontal section of the horizontal well d in an equidistant mode upwards in the top of the vertical axis of the well wall.
6. The thick coal seam vertical well reconstruction horizontal well drainage structure of claim 1 or 5, wherein: and symmetrical straight well shooting orifices are arranged at the bottom of the well wall of the straight well.
7. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 1, characterized in that: the top end of the vertical well is connected with a ground device through a well head at the ground surface.
8. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 1, characterized in that: the vertical shaft is internally provided with an oil pipe and a sucker rod, and the bottom ends of the oil pipe and the sucker rod are connected with an extraction pump.
9. The thick coal seam vertical well reformed horizontal well drainage and production structure of claim 1, characterized in that: the distance between the two adjacent vertical perforation openings is 2-5 times of the distance between the two adjacent horizontal perforation openings.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115126469A (en) * | 2022-06-22 | 2022-09-30 | 中国地质大学（武汉） | Method and computer equipment for optimizing deployment of coal bed gas well pattern |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115126469A (en) * | 2022-06-22 | 2022-09-30 | 中国地质大学（武汉） | Method and computer equipment for optimizing deployment of coal bed gas well pattern |
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