Multifunctional integrated well entering device and construction method

Abstract

The invention relates to the technical field of oil exploration and development, and discloses a multifunctional integrated well entering device and a construction method.The multifunctional integrated well entering device is characterized in that centralizing pipe bodies are alternately added on a plurality of drill rods, centralizing sections are arranged on the centralizing pipe bodies, and a plurality of convex spiral belts and concave spiral water tanks are sequentially arranged on the centralizing sections in the long edge direction of the pipe bodies; wherein a plurality of convex spiral belts are provided with rolling protection units, the rolling protection units roll in the well body in a manner of clinging to the inner wall of the well body and play a role in protecting a centralizing pipe body and a drill rod, and meanwhile, the concave spiral water tank is used for flowing through well washing fluid and has the function of washing the wall of a casing pipe in all directions. The righting pipe body enables the drill rod to be distributed in the center when entering the well body, axial centering of a downhole tool and a pipe column is achieved, the risk of damage to the casing wall is reduced, friction resistance between a drilling tool and a casing is reduced, the success rate of downhole operation is increased, and strong and effective guarantee is provided for stable production and upper production of an oil reservoir; and technical support is provided for solving the practical problems of similar oil reservoir development and production.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum exploration and development, and in particular to a multifunctional integrated well entry device and a construction method. Background Art

[0002] As the exploration of conventional oil resources continues to increase, the difficulty of exploration is increasing, the quality of newly added reserves is poor, the recovery rate is low, and at the same time, the developed oil fields have gradually entered the production decline period, and it is difficult to stabilize and increase the production of oil fields. Therefore, the oil industry strives to find major replacement resources and leap from conventional oil and gas to unconventional oil and gas. Unconventional oil and gas mainly include shale oil (gas) and tight oil (gas). As one of the unconventional oil and gas resources, tight oil is widely distributed and has huge resource potential. The global technically recoverable reserves are about 639.3×108t, becoming a new hotspot for global unconventional oil and gas exploration and development, and is called the "black gold" of the oil industry.

[0003] China's unconventional oil and gas exploration started late, but the resources are rich and widely distributed. In recent years, exploration discoveries and breakthroughs have been made in 11 blocks such as the Ordos Basin, Songliao Basin, and Bohai Bay Basin, and several large-scale production capacity areas have been initially built. By 2022, PetroChina has currently proved 7.37×108t of unconventional oil and gas geological reserves and built a production capacity of more than 400×104t / a. Due to the extremely poor physical properties of unconventional oil reservoirs, most of them are developed with development wells with complex well trajectories such as horizontal wells and cluster wells. In the production process of horizontal wells, it is inevitable that there will be downhole objects or production tools will be stuck. The existence of downhole objects directly affects the normal oil and gas production of horizontal wells. In severe cases, it will cause well shutdown, causing great economic losses to oilfield companies. Therefore, research on downhole operation technology for horizontal wells is becoming more and more important.

[0004] At present, during the downhole operation of horizontal wells, due to the complexity and particularity of the wellbore structure of horizontal wells, the downhole tools and pipe strings are close to the casing wall, and the friction between them increases with the extension of the pipe string. The downhole pipe string and drill string are easily stuck under the action of the pendulum force. Under this condition, when performing downhole operations, the casing and drill pipe are severely damaged, and the drilling pressure and torque cannot be effectively transmitted, which leads to low efficiency of fishing and grinding, affecting the effect of downhole operations. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a multifunctional integrated well entry device and construction method to solve the technical problems in the prior art that the casing and drill pipe are severely damaged during underground operations and the centering in the well affects the efficiency.

[0006] The present invention is achieved through the following technical solutions:

[0007] A multifunctional integrated well entry device comprises a plurality of straightening pipe bodies and drill pipes, wherein the plurality of straightening pipe bodies are alternately connected to the drill pipes in sequence, the straightening pipe bodies are provided with straightening sections, the straightening sections are provided with a plurality of convex spiral belts and concave spiral water grooves in sequence along the long side direction of the pipe bodies, the plurality of convex spiral belts and concave spiral water grooves are spirally arranged along the long side direction of the pipe bodies, the convex spiral belts are provided with rolling protection units, and the concave spiral water grooves are used for flowing well washing fluid.

[0008] Preferably, the straightening tube body includes an upper connecting section, a connecting section and a lower connecting section in sequence along the long side direction of the tube body, one end of the upper connecting section is connected to an end of a drill rod, and the other end is integrally connected to one end of the connecting section, the other end of the connecting section is integrally connected to one end of the straightening section, the other end of the straightening section is integrally connected to one end of the lower connecting section, and the other end of the lower connecting section is connected to another end of a drill rod.

[0009] Preferably, a plurality of convex spiral belts and concave spiral water grooves are alternately arranged in sequence along the pipe body of the straightening section, and the rotation angle is 80°.

[0010] Preferably, the outer diameter of the drill pipe is smaller than the outer diameter of the rolling protection unit on the straightening section.

[0011] Preferably, the rolling protection unit includes a plurality of wear-resistant columns and a plurality of rolling bodies; the convex spiral belt is provided with a plurality of wear-resistant holes in sequence along the edge, a plurality of wear-resistant columns are correspondingly pressed into the plurality of wear-resistant holes and extend out of the plane of the convex spiral belt, and the convex spiral belt is provided with a plurality of circular holes in sequence along the spiral direction in the middle part, a plurality of rolling bodies are correspondingly arranged in the plurality of circular holes and protrude out of the plane of the convex spiral belt.

[0012] Furthermore, the interference fit of the wear-resistant column in the wear-resistant hole is 0.15-0.2 mm, and the height of the wear-resistant column 133 extending from the surface of the convex spiral belt is 0.1-0.2 mm.

[0013] Furthermore, the height of the rolling body protruding from the convex spiral belt surface is 5-10 mm.

[0014] Furthermore, the rolling body includes a ball, a ring and a plurality of round beads; the plurality of round beads are laid flat in the arc groove in the circular hole, the ball is in the circular hole and placed on the plurality of round beads, and is covered on the circular hole by a ring.

[0015] A construction method of a multifunctional integrated well access device, based on the multifunctional integrated well access device described above, includes the following process:

[0016] A number of straightening pipes and drill pipes are alternately connected to form a well entry device, and the well entry device is sequentially extended along the well body to the downhole operation unit, wherein the convex spiral belt in the straightening section of the straightening pipe body is in close contact with the inner wall of the well body, and the drill pipe is transported to the downhole unit through the rolling protection unit on the convex spiral belt, so that the drill pipe is always centrally distributed in the well body, and there is a gap between the concave spiral water trough of the straightening section and the inside of the well body, which is used to have the function of all-round flushing of the casing wall after the well flushing fluid flows through.

[0017] Preferably, the rolling protection units are spirally distributed in the straightening section along the convex spiral belt.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The present invention provides a multifunctional integrated well entry device, which achieves this by alternately adding straightening pipe bodies to a plurality of drill pipes, the straightening pipe bodies are provided with straightening sections, and the straightening sections are provided with a plurality of convex spiral belts and concave spiral water grooves in sequence along the long side direction of the pipe body, wherein a plurality of convex spiral belts are provided with rolling protection units, and the rolling protection units roll closely against the inner wall of the well body in the well body, thereby protecting the straightening pipe body and the drill pipe, and at the same time, the concave spiral water groove is used for flowing well washing fluid to perform all-round flushing of the casing wall. The straightening pipe body in the present invention makes the drill pipe centrally distributed when entering the well body, realizes axial centering of the downhole tool and the pipe string, reduces the risk of damaging the casing wall, reduces the friction resistance between the drill tool and the casing, increases the success rate of downhole operations, provides strong and effective guarantee for the stable production and increase of the oil reservoir, and provides technical support for solving practical problems in the development and production of similar oil reservoirs.

[0020] Furthermore, the two ends of the straightening pipe body are respectively connected to the two drill pipes, so that when the drill pipe is extended, the central distribution of the drill pipe in the well body will not be affected, the risk of damaging the casing wall and the friction between the drill tool and the casing are reduced.

[0021] Furthermore, a plurality of convex spiral belts and concave spiral water grooves are alternately arranged along the pipe body of the straightening section, and the rotation angle is 80°, wherein the concave spiral water grooves provide water grooves in every direction of 360 degrees on the outer surface of the pipe string, and have the function of flushing the casing wall in all directions after the well washing fluid flows through, and the convex spiral belts protect the outer surface of the pipe string in every direction of 360 degrees.

[0022] Furthermore, the outer diameter of the drill pipe is smaller than the outer diameter of the rolling protection unit on the straightening section, so that the rolling protection unit contacts the outer wall of the well body, thereby protecting the drill pipe.

[0023] Furthermore, the rolling protection unit includes a plurality of wear-resistant columns and a plurality of rolling bodies. The convex spiral belt is provided with a plurality of wear-resistant holes in sequence along the edge. A plurality of wear-resistant columns are correspondingly pressed into the plurality of wear-resistant holes and extend out of the plane of the convex spiral belt, thereby effectively preventing the straightening section from being worn. The convex spiral belt is provided with a plurality of circular holes in sequence along the spiral direction in the middle part. A plurality of rolling bodies are correspondingly arranged in the plurality of circular holes and protrude out of the plane of the convex spiral belt, thereby ensuring that when tools such as drill rods move in the casing, the tools are centered in the casing and will not hit the casing wall, thereby reducing the friction during the operation of the downhole tools.

[0024] Furthermore, the rolling body includes a ball, a ring and a plurality of round beads. The plurality of round beads are laid flat in the arc groove in the circular hole. The ball is placed in the circular hole and on the plurality of round beads, and is covered on the circular hole through a ring. The function of the plurality of round beads is to reduce the friction resistance of the large cylinder during rotation. The ball is higher than the surface of the spiral belt on the plurality of round beads. Its function is to ensure that when tools such as drill rods move in the casing, the tools are centered in the casing and will not touch the casing wall, thereby reducing the friction when the downhole tools are running.

[0025] A construction method of a multifunctional integrated well entry device, which alternately connects a number of straightening pipe bodies and drill pipes to form a well entry device, and sequentially extends the well entry device into the downhole operation unit along the well body. The straightening pipe body protects the well entry device in the well body, which can effectively realize the axial centering of the downhole tool and the pipe string, reduce the risk of damaging the casing wall, reduce the friction between the drill tool and the casing, reduce the risk of the drill tool being stuck, improve the effective transmission of the drill tool torque, realize the all-round flushing of the casing wall, realize the horizontal well drill pipe casing, grinding, drilling, milling, and fishing process, and provide strong support for the downhole operation of the horizontal well. This technical solution has important practical significance for ensuring the normal production and operation of unconventional oil reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the well structure of the multifunctional integrated well entry device of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the straightening pipe body in the present invention;

[0028] Figure 3 It is a cross-sectional view of the centralizing tube body in the present invention;

[0029] Figure 4 for Figure 3 A-direction cross-sectional view;

[0030] Figure 5 for Figure 4 Enlarged view of part B.

[0031] In the figure: 1-righting pipe body; 2-drill pipe; 3-downhole operation unit; 11-upper connecting end; 12-connecting section; 13-righting section; 14-lower connecting end; 131-convex spiral belt; 132-concave spiral water groove; 133-wear-resistant column; 134-rolling body; 1341-ball; 1342-circular ring; 1343-circular hole; 1344-circular bead. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0034] The purpose of the present invention is to provide a multifunctional integrated well entry device and construction method to solve the technical problems in the prior art of serious damage to casing and drill pipe wells during downhole operations and the inability to center the well, which affects efficiency.

[0035] See also Figure 1 In one embodiment of the present invention, a multifunctional integrated well entry device is provided, comprising a plurality of straightening pipe bodies 1 and drill pipes 2, wherein the plurality of straightening pipe bodies 1 and drill pipes 2 are alternately connected in sequence. Figure 2 and Figure 3 As shown, the straightening pipe body 1 is provided with a straightening section 13, and the straightening section 13 is provided with a plurality of convex spiral belts 131 and concave spiral water grooves 132 in sequence along the long side direction of the pipe body. The plurality of convex spiral belts 131 and concave spiral water grooves 132 are spirally arranged along the long side direction of the pipe body, and a rolling protection unit is provided on the convex spiral belt 131, and the concave spiral water groove 132 is used for flowing well washing fluid.

[0036] Specifically, the straightening tube body 1 includes an upper connecting section 11, a connecting section 12 and a lower connecting section 14 in sequence along the long side direction of the tube body, one end of the upper connecting section 1 is connected to an end of a drill pipe 2, and the other end is integrally connected to one end of the connecting section 12, the other end of the connecting section 12 is integrally connected to one end of the straightening section 13, the other end of the straightening section 13 is integrally connected to one end of the lower connecting section 14, and the other end of the lower connecting section 14 is connected to another end of the drill pipe 2.

[0037] The two ends of the straightening pipe body 1 are respectively connected to the two drill pipes 2, so that the central distribution of the drill pipe in the well body will not be affected when the drill pipe 2 is extended, the risk of damaging the casing wall and the friction between the drill tool and the casing are reduced.

[0038] Specifically, a plurality of convex spiral belts 131 and concave spiral water grooves 132 are alternately arranged along the pipe body of the straightening section 13, and the rotation angle is 80°.

[0039] The concave spiral water groove makes the outer surface of the pipe string have water grooves in every direction of 360 degrees, which can flush the casing wall in all directions after the well washing fluid flows through it. The convex spiral belt protects the outer surface of the pipe string in every direction of 360 degrees.

[0040] Specifically, the outer diameter of the drill pipe 2 is smaller than the outer diameter of the rolling protection unit on the straightening section 13, so that the rolling protection unit contacts the outer wall of the well body, thereby protecting the drill pipe.

[0041] Specifically, according to Figure 4 As shown, the rolling protection unit includes a plurality of wear-resistant columns 133 and a plurality of rolling bodies 134; the convex spiral belt 131 is provided with a plurality of wear-resistant holes in sequence along the edge, a plurality of wear-resistant columns 133 are correspondingly pressed into the plurality of wear-resistant holes and extend out of the plane of the convex spiral belt 131, and the convex spiral belt 131 is provided with a plurality of circular holes 1343 in sequence along the spiral direction in the middle part, a plurality of rolling bodies 134 are correspondingly arranged in the plurality of circular holes 1343 and protrude out of the plane of the convex spiral belt 131.

[0042] Among them, if the ball or wear-resistant column is broken, it can be replaced.

[0043] Among them, the convex spiral belt is provided with a plurality of wear-resistant holes along the edge, and a plurality of wear-resistant columns are correspondingly pressed into the plurality of wear-resistant holes and extend out of the plane of the convex spiral belt, effectively preventing the straightening section from being worn; the convex spiral belt is provided with a plurality of circular holes in the middle along the spiral direction, and a plurality of rolling bodies are correspondingly arranged in the plurality of circular holes and protrude out of the plane of the convex spiral belt, so as to ensure that when tools such as drill pipes move in the casing, the tools are centered in the casing and will not touch the casing wall, thereby reducing the friction force when the downhole tools are running.

[0044] The material of the wear-resistant column 133 in the present invention is a high-wear-resistant, high-hardness hard alloy column, and the wear-resistant column 133 must not have cracks and breakages in the wear-resistant hole.

[0045] The interference of the wear-resistant column 133 pressed into the wear-resistant hole is 0.15-0.2 mm, and the height of the wear-resistant column 133 extending from the surface of the convex spiral belt 131 is 0.1-0.2 mm.

[0046] The height of the rolling body 134 protruding from the surface of the convex spiral belt 131 is 5-10 mm.

[0047] Specifically, according to Figure 5 As shown, the rolling body 134 includes a ball 1341, a ring 1342 and a plurality of round beads 1344; the plurality of round beads 1344 are laid flat in the arc groove in the circular hole 1343, the ball 1341 is in the circular hole 1343 and placed on the plurality of round beads 1344, and is covered on the circular hole 1343 by the ring 1342.

[0048] Among them, the role of several round beads is to reduce the friction resistance of the large cylinder during rotation. The balls are higher than the surface of the spiral belt on several round beads. Their role is to ensure that when tools such as drill pipes move in the casing, the tools are centered in the casing and will not touch the casing wall, thereby reducing the friction when the downhole tools are running.

[0049] The invention provides a multifunctional integrated well entry device, which adds straightening tubes alternately on a plurality of drill pipes, wherein the straightening tubes and the drill pipes can be connected at intervals according to actual conditions, and a straightening tube can be placed at intervals of two or more drill pipes. The straightening tube body is provided with a straightening section according to the complexity of the well trajectory, and a plurality of convex spiral belts and concave spiral water grooves are provided on the straightening section in sequence along the long side direction of the tube body, wherein a plurality of convex spiral belts are provided with rolling protection units, which roll against the inner wall of the well body in the well body, thereby protecting the straightening tube body and the drill pipe, and at the same time, the concave spiral water groove is used for flowing well washing fluid to flush the casing wall in all directions. The straightening tube body in the invention makes the drill pipe distributed centrally when entering the well body, realizes the axial centering of the downhole tool and the pipe string, reduces the risk of damaging the casing wall, reduces the friction resistance between the drilling tool and the casing, increases the success rate of downhole operations, provides strong and effective guarantee for the stable production and increase of oil reservoirs, and provides technical support for solving practical problems in the development and production of similar oil reservoirs.

[0050] according to Figure 1 As shown, the present invention also provides a construction method of a multifunctional integrated well access device, based on the multifunctional integrated well access device described above, comprising the following process:

[0051] A number of straightening pipe bodies 1 and drill pipes 2 are alternately connected to form a well entry device, and the well entry device is sequentially extended along the well body to the downhole operation unit 3, wherein the convex spiral belt 131 in the straightening section 13 of the straightening pipe body 1 is in close contact with the inner wall of the well body, and the drill pipe 2 is transported to the downhole unit through the rolling protection unit on the convex spiral belt 131, so that the drill pipe 2 is always centrally distributed in the well body, and there is a gap between the concave spiral water groove 132 of the straightening section 13 and the inside of the well body, which is used to have the function of all-round flushing of the casing wall after the well flushing fluid flows through.

[0052] Specifically, the rolling protection unit is spirally distributed in the straightening section 13 along the convex spiral band 131, so that the outer surface of the pipe column is protected in every direction of 360 degrees.

[0053] In summary, several straightening pipe bodies and drill pipes are alternately connected to form a well entry device, and the well entry device is sequentially extended into the downhole operation unit along the well body. The straightening pipe body protects the well entry device in the well body, which can effectively realize the axial centering of the downhole tool and the pipe string, reduce the risk of damaging the casing wall, reduce the friction between the drill tool and the casing, reduce the risk of drill tool stuck, improve the effective transmission of the drill tool torque, realize the all-round flushing of the casing wall, realize the horizontal well drill pipe casing, grinding, drilling, milling, and fishing process, and provide strong support for the downhole operation of the horizontal well. This technical solution has important practical significance for ensuring the normal production and operation of unconventional oil reservoirs.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A multifunctional integrated well entry device, characterized in that: The invention comprises a plurality of straightening pipe bodies (1) and drill pipes (2), wherein the plurality of straightening pipe bodies (1) and the drill pipes (2) are connected alternately in sequence, the straightening pipe body (1) is provided with a straightening section (13), the straightening section (13) is provided with a plurality of convex spiral bands (131) and concave spiral water grooves (132) in sequence along the long side direction of the pipe body, the plurality of convex spiral bands (131) and concave spiral water grooves (132) are arranged in a spiral manner along the long side direction of the pipe body, the convex spiral band (131) is provided with a rolling protection unit, and the concave spiral water groove (132) is used for flowing well washing fluid.

2. A multifunctional integrated well access device according to claim 1, characterized in that: The straightening tube body (1) comprises an upper connecting section (11), a connecting section (12) and a lower connecting section (14) in sequence along the long side direction of the tube body; one end of the upper connecting section (1) is connected to the end of a drill rod (2), and the other end is integrally connected to one end of the connecting section (12); the other end of the connecting section (12) is integrally connected to one end of the straightening section (13); the other end of the straightening section (13) is integrally connected to one end of the lower connecting section (14); and the other end of the lower connecting section (14) is connected to another end of the drill rod (2).

3. The multifunctional integrated well access device according to claim 1, characterized in that: A plurality of convex spiral belts (131) and concave spiral water grooves (132) are alternately arranged along the pipe body of the straightening section (13) in sequence, and the rotation angle is 80 degrees.

4. The multifunctional integrated well access device according to claim 1, characterized in that: The outer diameter of the drill rod (2) is smaller than the outer diameter of the rolling protection unit on the straightening section (13).

5. The multifunctional integrated well access device according to claim 1, characterized in that: The rolling protection unit comprises a plurality of wear-resistant columns (133) and a plurality of rolling bodies (134); the convex spiral band (131) is provided with a plurality of wear-resistant holes in sequence along the edge, the plurality of wear-resistant columns (133) are correspondingly pressed into the plurality of wear-resistant holes and extend out of the plane of the convex spiral band (131); the convex spiral band (131) is provided with a plurality of circular holes (1343) in sequence along the spiral direction in the middle part, the plurality of rolling bodies (134) are correspondingly arranged in the plurality of circular holes (1343) and protrude out of the plane of the convex spiral band (131).

6. The multifunctional integrated well access device according to claim 5, characterized in that: The interference fit of the wear-resistant column (133) in the wear-resistant hole is 0.15-0.2 mm, and the height of the wear-resistant column 133 extending from the surface of the convex spiral band (131) is 0.1-0.2 mm.

7. The multifunctional integrated well access device according to claim 5, characterized in that: The height of the rolling body (134) protruding from the surface of the convex spiral belt (131) is 5-10 mm.

8. The multifunctional integrated well access device according to claim 5, characterized in that: The rolling body (134) comprises a ball (1341), a ring (1342) and a plurality of round beads (1344); the plurality of round beads (1344) are laid flat in a circular arc groove in a circular hole (1343); the ball (1341) is in the circular hole (1343) and placed on the plurality of round beads (1344), and is covered on the circular hole (1343) by the ring (1342).

9. A construction method of a multifunctional integrated well access device, based on the multifunctional integrated well access device according to any one of claims 1 to 8, characterized in that: The process includes the following: A plurality of straightening pipe bodies (1) and drill pipes (2) are alternately connected to form a well entry device, and the well entry device is sequentially extended along the well body to a downhole operation unit (3), wherein a convex spiral belt (131) in a straightening section (13) of the straightening pipe body (1) is in close contact with the inner wall of the well body, and the drill pipe (2) is transported to the downhole unit through a rolling protection unit on the convex spiral belt (131), so that the drill pipe (2) is always centrally distributed in the well body, and a gap exists between the concave spiral water groove (132) of the straightening section (13) and the inside of the well body, so as to have the function of flushing the casing wall in all directions after the well flushing fluid flows through.

10. The construction method of a multifunctional integrated well entry device according to claim 8, characterized in that: The rolling protection unit is spirally distributed in the straightening section (13) along a convex spiral band (131).

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