Method for matrix centralized wellhead production and production wellhead slot

Abstract

The present application relates to the matrix type centralized wellhead oil production method and the oil production wellhead groove, the oil production wellhead is arranged in matrix type with close spacing, waterproof partition wall is arranged at both ends of the wellhead groove respectively, the bottom of the wellhead groove, the groove wall of box type structure and the waterproof partition wall are made of anti-permeation reinforced concrete by integral pouring; several wellhead grooves are arranged side by side, the groove wall of box type structure is arranged between two adjacent wellhead grooves, drainage ditch and water collecting pool are arranged in the wellhead groove, the drilling rig straddles the wellhead groove during drilling operation, the passing car cover plate is buckled on the wellhead groove except the drilling rig operation area, after drilling is completed, all the wellhead grooves are paved into steel grating plate, through the technical scheme, not only the structure is simple, but also the centralized drilling and oil production are convenient, safe and reliable, land and energy are saved, environment is protected, the oil production wellhead can be arranged in matrix type at close range, land is saved, the oil production tree of the wellhead is hidden below the ground, the environment is beautified and harmonious development is facilitated, the drilling machine is avoided to move and install multiple times, drilling efficiency is improved, energy is saved and environment is protected.

Description

Technical Field

[0001] This invention relates to an engineering technology for petroleum exploration and development, and in particular to a method for matrix-style centralized wellhead oil production and an oil wellhead slot. Background Technology

[0002] Traditional oil production primarily utilizes single-well sites and single-row cluster well sites. Because drilling and well workover operations require significant land area and have strict wellhead safety distance requirements, it's impossible to achieve a close-proximity, multi-row matrix arrangement of oil wellheads. With the development of horizontal well drilling technology, oil wellheads can be concentrated within the same well site. This concentrated, multi-row arrangement of wellheads offers significant advantages in urban areas and island regions due to its ability to greatly save land area, improve drilling efficiency, and promote land conservation, energy efficiency, and environmental friendliness throughout the entire development cycle. Summary of the Invention

[0003] In view of this, the main objective of the present invention is to provide a matrix-style centralized wellhead oil production method and wellhead slot. Through this technical solution, wellhead facilities such as wellhead trees are hidden underground, which greatly saves land use for oil well sites, improves drilling efficiency, makes up for the shortcomings of traditional well sites, enhances the aesthetics of the urban environment, and achieves harmonious development of oil and gas resource development with urban planning and the natural environment.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A matrix-style centralized wellhead oil production method can be completed by the following steps: A. Determine the number of production wellheads, row spacing, and column spacing based on reservoir characteristics and development requirements; B. Determine the net width of the wellhead slot based on the net spacing of the drilling rig base; C. Determine the net depth of the wellhead slot based on the height of the wellhead Christmas tree; D. Several wellhead slots are arranged side by side to achieve a close-spaced matrix arrangement of oil wellheads. Box-shaped slot walls are set on both sides of two adjacent wellhead slots. Waterproof isolation walls are set at both ends of several wellhead slots. The bottom of the wellhead slots, the box-shaped slot walls and the waterproof isolation walls are made of impermeable reinforced concrete cast in one piece. E. According to the spacing of the oil production line, several vertical pre-embedded steel casings are pre-embedded in the anti-seepage reinforced concrete structure at the bottom of the wellhead trench at the oil production location. A drainage ditch is set on one side of the bottom of the wellhead trench, and a water collection pool is set at one end of the wellhead trench connected to the drainage ditch. F. During drilling operations, the drilling rig rails are laid on the box-shaped structure of the two adjacent wellhead slots. The drilling rig spans across the wellhead slots, and the drilling rig bases are respectively set on the corresponding two sides of the drilling rig rails. A vehicle cover plate is laid on the wellhead slot outside the drilling rig position. G. After drilling is completed, several wellhead production trees are installed in the wellheads formed by the vertically embedded steel casing. Pipeline brackets are installed on the walls of the box-shaped structure adjacent to the drainage ditch. Low-voltage cables, high-voltage cables, oil and gas manifolds, and ventilation pipelines are sequentially hung on the pipeline brackets. After drilling is completed, wellhead production trees are installed in the vertically embedded steel casings. The low-voltage cables and high-voltage cables are electrically connected to the corresponding equipment of the wellhead production trees. The oil and gas manifolds are connected to the corresponding wellheads through single-well connection pipelines. The wellhead is connected to the wellhead tree, and the corresponding ventilation pipelines are equipped with side air inlets and bottom air inlets. When the combustible gas detector in the wellhead slot alarms, the interlocked ventilation pipelines are automatically activated to discharge oil and gas from the wellhead slot through the side air inlets and bottom air inlets to prevent oil and gas from accumulating in the wellhead slot. The vehicle cover plate on the wellhead slot, the drilling rig rails on the box-shaped slot wall, and the drilling rig are removed, and the entire wellhead slot is covered with steel grating.

[0005] A matrix-type centralized wellhead oil production wellhead trench includes a wellhead trench, a box-shaped trench wall, a waterproof isolation wall, a drainage ditch, a water collection pool, and vertically embedded steel casings. Several wellhead trenches are arranged side by side. The box-shaped trench wall is located between two adjacent wellhead trenches. The waterproof isolation wall is located at the end of the wellhead trench. The inner sidewall of the waterproof isolation wall is connected to the end face of the corresponding box-shaped trench wall. The box-shaped trench wall, the waterproof isolation wall, and the bottom surface of the wellhead trench are integrally cast from impermeable reinforced concrete. Several vertically embedded steel casings are pre-embedded in the impermeable reinforced concrete structure at the bottom of the wellhead trench at the oil outlet. The drainage ditch is located on the bottom surface of the wellhead trench on any side of the wellhead trench, and the water collection pool is located at any end of the drainage ditch.

[0006] As a further technical solution, it also includes vehicle cover plates and corbel beams. The corbel beams are horizontally set on the upper side of the box-shaped structure trench wall and are integrally cast with the box-shaped structure trench wall. During drilling operations, the drilling rig rails are respectively set on two adjacent box-shaped structure trench walls. The drilling rig crosses the wellhead trench. The drilling rig base is respectively set on the corresponding two sides of the drilling rig rails. Several vehicle cover plates are respectively fastened on the wellhead trench outside the drilling rig operating area. The two ends of the vehicle cover plates press downward against the corresponding corbel beams. The top of the vehicle cover plates is on the same horizontal plane as the top of the box-shaped structure trench wall.

[0007] As a further technical solution, it also includes pipeline brackets, low-voltage cables, high-voltage cables, oil and gas manifolds, single-well connection pipelines, and ventilation pipelines. Several pipeline brackets are fixed on the side of the box-shaped structure trench wall located above the drainage ditch. The low-voltage cables, high-voltage cables, oil and gas manifolds, and ventilation pipelines are hung on the pipeline brackets in layers. After the drilling work is completed, a wellhead Christmas tree is set in the vertically embedded steel casing. The low-voltage cables and high-voltage cables are electrically connected to the corresponding equipment of the wellhead Christmas tree. The oil and gas manifolds are connected to the corresponding wellhead Christmas tree through single-well connection pipelines. The corresponding ventilation pipelines of the wellhead Christmas tree are respectively equipped with side air inlets and bottom air inlets.

[0008] As a further technical solution, it also includes steel grating and steel beams under the steel grating. After the drilling work is completed, the vehicle cover plate on the wellhead slot, the drilling rig rails on the box-shaped structure slot wall and the drilling rig are removed. The wellhead slot is completely covered with steel grating. Steel beams under the steel grating are set on both sides of the steel grating. The two ends of the steel beams under the steel grating press down on the corresponding corbel beams.

[0009] As a further technical solution, the box-shaped structure trench wall is a hollow rectangular structure, and backfill material is filled and compacted in the hollow space of the box-shaped structure trench wall.

[0010] The beneficial effects of adopting the above technical solution are as follows: A matrix-style centralized wellhead oil production method and wellhead slot, through this technical solution, not only has a simple structure, but also facilitates centralized drilling and oil production, is safe and reliable, saves land, energy and is environmentally friendly. Compared with existing oil and gas drilling and production methods, it has the following advantages: a) It can achieve close-range matrix arrangement of oil wellheads, saving land.

[0011] b) The wellhead production tree is hidden below the ground, which facilitates environmental beautification and harmonious development.

[0012] c) Avoid multiple relocations and installations of drilling equipment, improve drilling efficiency, and save energy and protect the environment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall bottom cross-sectional structure of the present invention during drilling.

[0014] Figure 2 This is a schematic diagram of the transverse cross-sectional structure during wellhead slot drilling operations in this invention.

[0015] Figure 3 This is a schematic diagram of the transverse cross-sectional structure after the wellhead slot drilling operation is completed in this invention.

[0016] In the diagram, 1 is the wellhead trench, 2 is the wellhead tree, 3 is the box-type trench wall, 4 is the waterproof isolation wall, 5 is the vertical pre-embedded steel casing, 6 is the drainage ditch, 7 is the water collection pool, 8 is the drilling rig rail, 9 is the drilling rig, 10 is the drilling rig base, 11 is the vehicle passage cover plate, 12 is the pipeline bracket, 13 is the low-voltage cable, 14 is the high-voltage cable, 15 is the oil and gas manifold, 16 is the exhaust pipeline, 17 is the single well connection pipeline, 18 is the side air inlet of the exhaust pipeline, 19 is the bottom air inlet of the exhaust pipeline, 20 is the steel grating, 21 is the steel beam under the steel grating, 22 is the backfill material, and 23 is the corbel beam. Detailed Implementation

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0018] like Figures 1-3 As shown.

[0019] The matrix-style centralized wellhead oil production method of the present invention is implemented according to the following steps: A. Determine the number of production wellheads, row spacing, and column spacing based on reservoir characteristics and development requirements; B. Determine the net width of wellhead slot 1 based on the net spacing of the drilling rig base 10; C. Determine the net depth of wellhead slot 1 based on the height of wellhead tree 2; D. Several wellhead slots 1 are arranged side by side to achieve a close-spaced matrix arrangement of oil wellheads. Box-shaped structure slot walls 3 are set on both sides of two adjacent wellhead slots 1. Waterproof isolation walls 4 are set on both ends of several wellhead slots 1. The bottom of the wellhead slots 1, the box-shaped structure slot walls 3 and the waterproof isolation walls 4 are made of impermeable reinforced concrete cast in one piece. E. According to the spacing of the oil production line, several vertical pre-embedded steel sleeves 5 are pre-embedded in the anti-seepage reinforced concrete structure at the bottom of the wellhead trench 1 at the oil production location. A drainage ditch 6 is set on one side of the bottom of the wellhead trench 1. A water collection pool 7 is set at one end of the wellhead trench 1 connected to the drainage ditch 6. F. During drilling operations, the drilling rig rails 8 are laid on the box-shaped structure trench walls 3 of two adjacent wellhead trenches 1, the drilling rig 9 spans across the wellhead trenches 1, and the drilling rig bases 10 are respectively set on the corresponding two sides of the drilling rig rails 8. The wellhead trenches 1 outside the position of the drilling rig 9 are covered with vehicle cover plates 11.

[0020] G. After drilling is completed, several wellhead production trees 2 are respectively installed in the wellheads formed by the vertically embedded steel casing 5. Pipeline brackets 12 are installed on the adjacent box-shaped structure trench walls 3 of the drainage ditch 6. Low-voltage cables 13, high-voltage cables 14, oil and gas manifolds 15, and ventilation pipelines 16 are respectively hung on the pipeline brackets 12. After drilling is completed, wellhead production trees 2 are installed in the vertically embedded steel casing 5. The low-voltage cables 13 and high-voltage cables 14 are electrically connected to the corresponding equipment of the wellhead production trees 2. The oil and gas manifolds 15 are connected to the corresponding wells through single-well connection pipelines 17. The wellhead tree 2 is connected to the wellhead tree 2. The exhaust pipeline 16 corresponding to the wellhead tree 2 is equipped with an exhaust pipeline side air inlet 18 and an exhaust pipeline bottom air inlet 19. When the combustible gas detector in the wellhead slot 1 alarms, the interlocked exhaust pipeline 16 is automatically activated to discharge the oil and gas in the wellhead slot 1 through the exhaust pipeline side air inlet 18 and the exhaust pipeline bottom air inlet 19 to prevent the oil and gas from accumulating in the wellhead slot 1. The vehicle cover plate 11 located on the wellhead slot 1, the drilling rig rail 8 located on the box-shaped structure slot wall 3 and the drilling rig 9 are removed, and the entire wellhead slot 1 is covered with steel grating 20.

[0021] The present invention relates to a matrix-type centralized wellhead oil production wellhead trench, which includes a wellhead trench 1, a box-shaped trench wall 3, a waterproof isolation wall 4, a drainage ditch 6, a water collection pool 7, and vertically embedded steel casings 5. Several wellhead trenches 1 are arranged side by side, the box-shaped trench wall 3 is arranged between two adjacent wellhead trenches 1, the waterproof isolation wall 4 is arranged at the end of the wellhead trench 1, and the inner side wall of the waterproof isolation wall 4 is connected to the end face of the box-shaped trench wall 3 at the corresponding position. The box-shaped trench wall 3, the waterproof isolation wall 4, and the bottom surface of the wellhead trench 1 are integrally cast from impermeable reinforced concrete. Several vertically embedded steel casings 5 ​​are pre-embedded in the impermeable reinforced concrete structure at the bottom of the wellhead trench 1 at the oil outlet position. The drainage ditch 6 is arranged on the bottom surface of the wellhead trench 1 on any side of the wellhead trench 1, and the water collection pool 7 is arranged at any end connected to the drainage ditch 6.

[0022] As a further embodiment, it also includes a vehicle cover plate 11 and a corbel beam 23. The corbel beam 23 is horizontally set on the upper side of the box-shaped structure groove wall 3 and is integrally cast with the box-shaped structure groove wall 3. During drilling operations, the drilling rig rails 8 are respectively set on two adjacent box-shaped structure groove walls 3, the drilling rig 9 spans the wellhead groove 1, and the drilling rig base 10 is respectively set on the corresponding two sides of the drilling rig rails 8. Several vehicle cover plates 11 are respectively fastened on the wellhead groove 1 outside the working area of ​​the drilling rig 9. The two ends of the vehicle cover plate 11 press down on the corresponding corbel beam 23, and the top of the vehicle cover plate 11 is on the same horizontal plane as the top of the box-shaped structure groove wall 3.

[0023] As a further embodiment, it also includes pipeline brackets 12, low-voltage cables 13, high-voltage cables 14, oil and gas manifolds 15, and exhaust pipelines 16. Several pipeline brackets 12 are fixed on the side of the box-shaped structure trench wall 3 located above the drainage ditch 6. The low-voltage cables 13, high-voltage cables 14, oil and gas manifolds 15, and exhaust pipelines 16 are hung on the pipeline brackets 12 in layers. After the drilling work is completed, a wellhead tree 2 is set in the vertical pre-embedded steel casing 5. The low-voltage cables 13 and high-voltage cables 14 are electrically connected to the corresponding equipment of the wellhead tree 2. The oil and gas manifolds 15 are connected to the corresponding wellhead tree 2 through single-well connection pipelines 17. The exhaust pipelines 16 corresponding to the wellhead tree 2 are respectively provided with side air inlets 18 and bottom air inlets 19.

[0024] As a further embodiment, it also includes a steel grating plate 20 and a steel grating lower steel beam 21. After the drilling work is completed, the vehicle cover plate 11 located on the wellhead slot 1, the drilling rig rail 8 located on the box-shaped structure slot wall 3 and the drilling rig 9 are removed, and the wellhead slot 1 is completely covered with a steel grating plate 20. A steel grating lower steel beam 21 is respectively set on the lower sides of the steel grating plate 20, and the two ends of the steel grating lower steel beam 21 press down on the corresponding corbel beam 23.

[0025] As a further embodiment, the box-shaped structure trough wall 3 is a hollow rectangular structure, and backfill material 22 is filled and compacted in the hollow space of the box-shaped structure trough wall 3.

[0026] In practical applications, the invention employs a multi-slot underground arrangement in the wellhead trench 1. The horizontal standard spacing between multiple wellheads within each wellhead trench 1 is 3m. The wellhead tree 2 is centrally located within the wellhead trench 1. The ventilation pipeline 16, oil and gas manifold 15, low-voltage cable 13, and high-voltage cable 14 are arranged in layers on the pipeline bracket 12 above the drainage ditch 6. During drilling, a precast reinforced concrete vehicle cover 11 is installed on the wellhead trench 1 to facilitate vehicle passage during transportation. During oil extraction operations, a steel grating 20 is installed on the wellhead trench 1, and the wellhead tree 2 is hidden below ground level while maintaining ventilation within the wellhead trench 1.

[0027] When rainwater or water accumulates in the wellhead trench 1, the water will flow into the collection pool 7 through the drainage ditch 6. The collection pool 7 is equipped with a pumping device that can pump the water out of the wellhead trench 1 at any time. When the wellhead tree 2 leaks gas, the side air inlet 18 and the bottom air inlet 19 of the exhaust pipe in the wellhead trench 1 will draw in the leaked gas and discharge it through the exhaust pipe 16.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

1. A method for matrix-style centralized wellhead oil production, characterized in that, Follow these steps to complete: A. Determine the number of production wellheads, row spacing, and column spacing based on reservoir characteristics and development requirements; B. Determine the net width of the wellhead slot based on the net spacing of the drilling rig base; C. Determine the net depth of the wellhead slot based on the height of the wellhead Christmas tree; D. Several wellhead slots are arranged side by side to achieve a close-spaced matrix arrangement of oil wellheads. Box-shaped slot walls are set on both sides of two adjacent wellhead slots. Waterproof isolation walls are set on both ends of several wellhead slots. The bottom of the wellhead slots, the box-shaped slot walls and the waterproof isolation walls are made of impermeable reinforced concrete cast in one piece. E. According to the spacing of the oil production line, several vertical pre-embedded steel casings are pre-embedded in the anti-seepage reinforced concrete structure at the bottom of the wellhead trench at the oil production location. A drainage ditch is set on one side of the bottom surface of the wellhead trench, and a water collection pool is set at one end of the wellhead trench connected to the drainage ditch. F. During drilling operations, the drilling rig rails are laid on the box-shaped structure of the two adjacent wellhead slots. The drilling rig spans across the wellhead slots, and the drilling rig bases are respectively set on the corresponding two sides of the drilling rig rails. A vehicle cover plate is laid on the wellhead slot outside the drilling rig position. G. After drilling is completed, several wellhead production trees are installed in the wellheads formed by the vertically embedded steel casing. Pipeline brackets are installed on the walls of the box-shaped structure adjacent to the drainage ditch. Low-voltage cables, high-voltage cables, oil and gas manifolds, and ventilation pipelines are sequentially hung on the pipeline brackets. After drilling is completed, wellhead production trees are installed in the vertically embedded steel casings. The low-voltage cables and high-voltage cables are electrically connected to the corresponding equipment of the wellhead production trees. The oil and gas manifolds are connected to the corresponding wellheads through single-well connection pipelines. The wellhead is connected to the wellhead tree, and the corresponding ventilation pipelines are equipped with side air inlets and bottom air inlets. When the combustible gas detector in the wellhead slot alarms, the interlocked ventilation pipelines are automatically activated to discharge oil and gas from the wellhead slot through the side air inlets and bottom air inlets to prevent oil and gas from accumulating in the wellhead slot. The vehicle cover plate on the wellhead slot, the drilling rig rails on the box-shaped slot wall, and the drilling rig are removed, and the entire wellhead slot is covered with steel grating.

2. A matrix-type centralized wellhead oil production wellhead slot, comprising a wellhead slot, characterized in that, It also includes box-shaped trench walls, waterproof isolation walls, drainage ditches, sump basins, vertically embedded steel sleeves, vehicle access covers, and corbel beams. Several wellhead trenches are arranged side by side, with the box-shaped trench walls positioned between two adjacent wellhead trenches. The waterproof isolation walls are located at the ends of the wellhead trenches, with their inner walls connected to the corresponding end faces of the box-shaped trench walls. The box-shaped trench walls, waterproof isolation walls, and the bottom of the wellhead trenches are integrally cast from impermeable reinforced concrete. Several vertically embedded steel sleeves are pre-embedded in the impermeable reinforced concrete structure at the bottom of the wellhead trench at the oil wellhead location. Drainage ditches are located anywhere within the wellhead trenches. On one side of the wellhead trench bottom, the water collection pool is set at any end connected to the drainage ditch. The corbel beam is horizontally set on the upper side of the box-shaped structure trench wall and is cast integrally with the box-shaped structure trench wall. During drilling operations, the drilling rig rails are set on two adjacent box-shaped structure trench walls respectively. The drilling rig spans across the wellhead trench. The drilling rig base is set on the corresponding two side rails respectively. Several vehicle cover plates are respectively fastened on the wellhead trench outside the drilling rig operating area. The two ends of the vehicle cover plates press down against the corresponding corbel beams respectively. The top of the vehicle cover plates is on the same horizontal plane as the top of the box-shaped structure trench wall.

3. The wellhead trench for matrix-type centralized wellhead oil production according to claim 2, characterized in that, It also includes pipeline brackets, low-voltage cables, high-voltage cables, oil and gas manifolds, single-well connection pipelines, and ventilation pipelines. Several pipeline brackets are fixed on the side of the box-shaped structure trench wall located above the drainage ditch. The low-voltage cables, high-voltage cables, oil and gas manifolds, and ventilation pipelines are hung on the pipeline brackets in layers. After the drilling work is completed, a wellhead Christmas tree is set in the vertically embedded steel casing. The low-voltage cables and high-voltage cables are electrically connected to the corresponding equipment of the wellhead Christmas tree. The oil and gas manifolds are connected to the corresponding wellhead Christmas trees through single-well connection pipelines. The ventilation pipelines corresponding to the wellhead Christmas trees are respectively equipped with side air inlets and bottom air inlets.

4. The wellhead trench for matrix-type centralized wellhead oil production according to claim 2, characterized in that, It also includes steel grating and steel beams under the steel grating. After the drilling work is completed, the vehicle cover plate on the wellhead slot, the drilling rig rails on the box-shaped structure slot wall and the drilling rig are removed. The wellhead slot is completely covered with steel grating. Steel beams under the steel grating are set on both sides of the steel grating. The two ends of the steel beams under the steel grating press down on the corresponding corbel beams.

5. The wellhead trench for matrix-type centralized wellhead oil production according to claim 2, characterized in that, The box-shaped structure has a hollow rectangular wall, and backfill material is filled and compacted in the hollow space of the box-shaped structure.

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