A branch pipe drilling device with controllable branch pipe extension speed

Abstract

The present invention proposes a branch pipe drilling device with controllable branch pipe extension speed, comprising a construction pipe column, a speed control module is provided at the lower end of the construction pipe column; a speed control piston is provided in the construction pipe column, the speed control piston divides the space in the construction pipe column into an upper driving chamber and a lower restraining chamber; a branch pipe connected to the speed control piston, the branch pipe extends outward as the speed control piston moves; wherein the speed control piston moves downward under the pressure of the driving chamber, thereby driving the branch pipe to extend outward; the speed control module controls the outflow speed of the fluid in the restraining chamber, thereby controlling the moving speed of the speed control piston. The present invention can control the branch pipe extension speed, thereby achieving the purpose of improving the construction success rate and reducing costs.

Description

Technical Field

[0001] The invention relates to a branch pipe drilling device with controllable branch pipe extension speed, belonging to the field of petroleum engineering drilling. Background Art

[0002] Branch pipe production enhancement technology is a carbonate open hole well production enhancement technology. During the implementation of this technology, a small diameter branch pipe is first pre-set in the completion string. One end of the branch pipe is freely placed in the completion string, and the other end passes through the lateral hole on the wall of the completion string. A nozzle is set at the end of the branch pipe passing through the lateral hole. After the tool is lowered to the predetermined position, high-pressure acid is pumped into the completion string. The acid flows through the branch pipe and the nozzle, and is ejected onto the well wall at high speed, creating holes in the reservoir through the combined action of the jet and the acid-rock reaction. Due to the throttling effect of the nozzle, the throttling pressure difference pulls the branch pipe outward into the pores of the reservoir, and continuously extends into the reservoir, achieving the purpose of connecting the reservoir and increasing production.

[0003] The existing branch pipe production stimulation tools have the following problems: since the extension speed and hole-making speed of the branch pipe are controlled by the pressure of the pumped acid, the extension speed and the hole-making speed often do not match, and the extension speed is too fast, causing the branch pipe to bend and damage, resulting in operation failure. Summary of the invention

[0004] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a branch pipe drilling device with controllable branch pipe extension speed, which can control the branch pipe extension speed to achieve the purpose of improving the construction success rate and reducing costs.

[0005] The present invention provides a branch pipe drilling device with controllable branch pipe extension speed, comprising:

[0006] A construction pipe string, wherein a speed control module is provided at the lower end of the construction pipe string;

[0007] A speed control piston is arranged in the construction pipe string, and the speed control piston divides the space in the construction pipe string into an upper driving chamber and a lower containment chamber;

[0008] A branch pipe connected to the speed control piston, wherein the branch pipe extends outward as the speed control piston moves;

[0009] Wherein, the speed control piston moves downward under the pressure of the driving chamber, thereby driving the branch pipe to extend outward; the speed control module controls the outflow speed of the fluid in the containment chamber to control the moving speed of the speed control piston.

[0010] A further improvement of the present invention is that a housing is provided at the lower end of the construction pipe string, and the speed control module is provided at the upper part of the housing;

[0011] A curved pipe with a certain angle is arranged in the shell, and the lower part of the branch pipe is arranged in the curved pipe and extends outward through the curved pipe.

[0012] A further improvement of the present invention is that a through hole is provided on the speed control piston, and the upper end of the branch pipe is fixedly connected in the hole and passes through the hole so that its interior is connected to the drive chamber.

[0013] A further improvement of the present invention is that a nozzle is provided at the lower end of the branch pipe, and a sealing device is used to seal the elbow and the branch pipe.

[0014] A further improvement of the present invention is that a flow channel connecting the containment chamber and the outside is provided at the upper portion of the shell, and the speed control module is provided in the flow channel and controls the flow of the flow channel.

[0015] A further improvement of the present invention is that the speed control module includes a rupture disk and a flow limiting valve group; in an initial state, the rupture disk closes the flow channel; when the pressure in the containment chamber increases to a certain value, the rupture disk breaks under the action of the pressure; and the fluid in the containment chamber flows out through the flow limiting valve group.

[0016] A further improvement of the present invention is that the construction pipe string includes a plurality of casings, and the casings are connected by couplings.

[0017] A further improvement of the present invention is that a first seal is provided on the outer wall of one end of the speed control piston, and a second seal is provided on the other end.

[0018] A further improvement of the present invention is that the first seal and the second seal are large gap seals.

[0019] A further improvement of the present invention is that the edges at both ends of the speed control piston are chamfered.

[0020] A further improvement of the present invention is that the end of the shell is an arc-shaped surface, and the outlet of the elbow is obliquely arranged on the side of the shell.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The branch pipe drilling device with controllable branch pipe extension speed of the present invention can control the branch pipe extension speed and hole-making speed respectively, prevent problems such as branch pipe buckling caused by mismatch between extension and hole-making speed, and greatly reduce the operation risk. By adjusting the parameters of the speed control module, the branch pipe extension speed can be easily adjusted; by reasonably setting the double sealing structure of the speed control piston, sealing is achieved during the process of passing the coupling, creating conditions for the construction of long branch pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0024] Figure 1 It is a schematic structural diagram of a branch pipe drilling device with controllable branch pipe extension speed according to an embodiment of the present invention, showing the structure in an initial state;

[0025] Figure 2 It is a schematic structural diagram of a branch pipe drilling device with controllable branch pipe extension speed according to an embodiment of the present invention, showing the state when the second seal passes through the coupling;

[0026] Figure 3 It is a schematic structural diagram of a branch pipe drilling device with controllable branch pipe extension speed according to an embodiment of the present invention, showing the state when the first seal passes through the coupling;

[0027] Figure 4 It is a schematic structural diagram of a branch pipe drilling device with controllable branch pipe extension speed according to an embodiment of the present invention, showing the state of completing branch pipe drilling.

[0028] In the drawings, the same reference numerals are used for the same components, but the drawings are not drawn to scale.

[0029] The meanings of the various reference numerals in the accompanying drawings are as follows: 1. construction pipe string, 2. speed control piston, 3. housing, 11. drive chamber, 12. restraining chamber, 13. casing, 14. coupling, 21. branch pipe, 22. first seal, 23. second seal, 24. nozzle, 31. speed control module, 32. elbow, 33. sealing device. DETAILED DESCRIPTION

[0030] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0031] Figure 1A branch pipe drilling device with controllable branch pipe extension speed according to an embodiment of the present invention is schematically shown, which includes a construction pipe string 1, and a speed control module 31 is arranged at the lower end of the construction pipe string 1. The speed control module 31 controls the speed of the branch pipe 21 extending outward in this embodiment. The construction pipe string 1 includes a speed control piston 2, and the speed control piston 2 divides the space in the construction pipe string 1 into two parts, namely a driving chamber 11 above the speed control piston 2 and a restraining chamber 12 below the speed control piston 2. The pressure of the driving chamber 11 provides pressure for drilling the branch pipe 21 on the one hand, and also provides thrust for moving the speed control piston 2 on the other hand. The restraining chamber 12 is filled with a fluid, preferably a liquid such as water or completion fluid, which provides a certain resistance to the movement of the speed control piston 2, so that it moves at a certain speed, thereby controlling the speed of the branch pipe 21 extending out.

[0032] The speed control piston 2 is connected to a branch pipe 21, and the branch pipe 21 moves with the speed control piston 2. When the speed control piston 2 moves downward, the branch pipe 21 also moves downward, and its lower end extends outward. In this embodiment, the "upward" direction is the direction close to the wellhead. Figure 1 The middle is the left side; the "down" side is the direction away from the wellhead. Figure 1 Middle is the right side.

[0033] In the branch pipe drilling device with controllable branch pipe extension speed according to this embodiment, the speed control piston 2 moves downward under the pressure of the drive chamber 11, thereby driving the branch pipe 21 to extend outward; the speed control module 31 controls the outflow speed of the fluid in the containment chamber 12 to control the moving speed of the speed control piston 2. The speed control module 31 can control the extension speed of the branch pipe 21 so that the extension speed matches the hole making speed.

[0034] In one embodiment, a shell 3 is provided at the lower end of the construction pipe column 1. The shell 3 is a cylindrical structure, and a thread is provided at the upper end thereof, and the construction pipe column 1 is connected by the thread. The speed control module 31 is provided at the upper part of the shell 3. A curved pipe 32 with a certain angle is provided inside the shell 3. The opening of the upper end of the curved pipe 32 is provided at the upper end of the shell 3, and the opening of the lower end is provided at the side of the lower part of the shell 3, forming a curved pipe inside. The angle of the curved pipe 32 is set according to the angle of the hole required.

[0035] In the branch pipe drilling device with controllable branch pipe extension speed according to the present embodiment, the curved pipe 32 provides guidance for the branch pipe 21 and provides a bending angle and extension direction for the branch pipe 21 to extend.

[0036] In a preferred embodiment, the speed control piston 2 is provided with a through hole, the branch pipe 21 passes through the hole, and the outer wall of the upper end of the branch pipe 21 is fixedly sealed and connected to the inner wall of the hole. The inside of the branch pipe 21 is connected to the driving chamber 11.

[0037] In one embodiment, a nozzle 24 is provided at the lower end of the branch pipe 21, and the elbow 32 and the branch pipe 21 are sealed by a sealing device 33. The nozzle 24 has a throttling effect, converting the high-pressure fluid in the driving chamber 11 into a high-speed fluid, ejecting it toward the well wall to make a hole, and driving the branch pipe 21 to extend outward through the throttling pressure difference. The sealing device 33 can seal the gap between the branch pipe 21 and the elbow 32, and prevent the fluid in the containment chamber 12 from flowing out through the gap between the branch pipe 21 and the elbow 32.

[0038] When the device according to this embodiment is used, the pressure in the driving chamber 11 is transmitted to the branch pipe 21, and the high-speed fluid is ejected through the nozzle 24 to form a hole. At the same time, the pressure in the driving chamber 11 also drives the speed control piston 2 to move. The sealing device 33 plays a role in sealing the containment chamber 12, so that the fluid in the chamber can only flow out through the speed control module 31.

[0039] In one embodiment, a flow channel connecting the containment chamber 12 and the outside is disposed on the upper portion of the housing 3, and the speed control module 31 is disposed in the flow channel and controls the flow rate of the flow channel. Figure 1 In the illustrated embodiment, a groove is provided at the upper end of the housing 3, the containment cavity 12 extends into the groove, and the flow channel is radially provided on the side wall of the housing 3 to connect the groove with the outside.

[0040] During operation, due to the throttling effect of the nozzle 24, the throttling pressure difference of the nozzle 24 drives the branch pipe 21 to extend outward. At the same time, due to the incompressibility of the liquid in the containment chamber 12, the speed control piston 2 cannot move to the right at this time, which hinders the extension of the branch pipe 21. When the pumping pressure continues to increase, the pressure in the drive chamber 11 pushes the speed control piston 2 to move downward, causing the pressure in the containment chamber 12 to increase, and the speed control module 31 begins to discharge at a corresponding speed. At this time, the speed control piston 2 moves to the right at a certain speed, and then the branch pipe 21 extends outward at a certain speed. By adjusting the flow rate of the speed control module 31 under a specific pressure, the moving speed of the speed control piston 2 under the pressure can be adjusted, thereby controlling the extension speed of the branch pipe 21. The purpose of separately controlling the jet hole-making speed and the extension speed of the branch pipe 21 is achieved, preventing the extension speed of the branch pipe 21 from exceeding the hole-making speed.

[0041] In a preferred embodiment, the speed control module 31 includes a rupture disk and a flow limiting valve group; in the initial state, the rupture disk closes the flow channel to prevent the fluid from flowing out prematurely. When the pressure in the containment chamber 12 increases to a certain value, the rupture disk breaks under the action of the pressure; the fluid in the containment chamber 12 flows out through the flow limiting valve group.

[0042] In this embodiment, the speed control module 31 has a certain starting pressure through the function of the valve itself or the rupture disk, and when the pressure is low, the flow channel is cut off and no fluid passes. When the pressure rises to a specific value, the speed control module 31 releases the fluid at a corresponding speed.

[0043] In one embodiment, the construction pipe string 1 includes a plurality of casings 13, and the casings 13 are connected by couplings 14. Both sides of the couplings 14 are provided with internal threads, and the ends of the casings 13 are provided with external threads. The external threads of the casings 13 are connected to the internal threads of the couplings 14, and the connection is firm and easy to disassemble and assemble.

[0044] In one embodiment, a first seal 22 is provided on the outer wall of one end of the speed control piston 2, and a second seal 23 is provided on the other end. In the process of the speed control piston 2 moving downward, the second seal 23 first passes the position of the coupling 14. Since the position of the coupling 14 is inevitably uneven, there may be a temporary seal failure problem in the process of the second seal 23 passing through. At this time, the first seal 22 is in a sealed state, which can keep the driving chamber 11 and the containment chamber 12 sealed; when the second seal 23 passes through the coupling 14, the second seal 23 is in a sealed state.

[0045] In a preferred embodiment, the first seal 22 and the second seal 23 are large gap seals, such as lip seals such as Yx seal rings, Y-shaped rings, V-shaped rings, etc.

[0046] In one embodiment, the edges of both ends of the speed control piston 2 are chamfered. When the speed control piston 2 passes through the coupling 14, the chamfered structure enables it to pass smoothly without getting stuck on the coupling 14.

[0047] In one embodiment, the end of the shell is an arc-shaped surface, preferably a hemispherical surface, which is convenient for lowering into the wellbore. The outlet of the curved pipe 32 is inclinedly arranged on the side of the shell.

[0048] When using the device according to this embodiment, first assemble the device according to this embodiment and put the pipe string into place. Then pump high-pressure acid into the pipe string. At this time, the pressure of the driving chamber 11 and the containment chamber 12 increases at the same time, and the high-pressure liquid passes through the channel of the speed control piston 2, flows through the branch pipe 21, and is ejected from the nozzle 24 to the well wall, and a hole is formed by high-speed jet or acid-rock reaction.

[0049] Due to the throttling effect of the nozzle 24, the throttling pressure difference of the nozzle 24 drives the branch pipe 21 to extend outward. When the pumping pressure is increased to a certain value, the pressure in the driving chamber 11 pushes the speed control piston 2 to move downward, so that the pressure in the containment chamber 12 increases, the rupture disk breaks, and the speed control module 31 begins to discharge at a corresponding speed. At this time, the speed control piston 2 moves downward at a certain speed, and then the branch pipe 21 extends outward at a certain speed. By adjusting the flow rate of the speed control module 31 under a specific pressure, the moving speed of the speed control piston 2 under the pressure can be adjusted, and then the extension speed of the branch pipe 21 can be controlled. The purpose of separately controlling the jet hole-making speed and the extension speed of the branch pipe 21 is achieved, and the extension speed of the branch pipe 21 is prevented from exceeding the hole-making speed.

[0050] Since the inner diameter of the coupling 14 may be slightly larger than the inner diameter of the sleeve 13, in order to ensure the sealing between the driving chamber 11 and the restraining chamber 12 during the extension of the branch pipe 21, a first seal 22 and a second seal 23 are provided at both ends of the speed control piston 2. The axial lengths thereof are reasonably designed so that when the speed control piston 2 passes through the coupling 14, the first seal 22 and the second seal 23 act alternately to prevent the pressure on the left and right sides of the speed control piston 2 from being connected. Figure 2 The right end of the speed control piston 2 is sealed through the coupling 14, and the left end seal plays a sealing role at this time. Figure 3 The left end of the speed control piston 2 is sealed through the coupling 14, and the right end seal plays a sealing role. Figure 4 shown).

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A branch pipe drilling device with controllable branch pipe extension speed, characterized in that: include: A construction pipe string (1), wherein a speed control module (31) is provided at the lower end of the construction pipe string (1); A speed control piston (2) is arranged in the construction pipe string (1), and the speed control piston (2) divides the space in the construction pipe string (1) into an upper driving chamber (11) and a lower containment chamber (12); A branch pipe (21) connected to the speed control piston (2), wherein the branch pipe (21) extends outward as the speed control piston (2) moves; The speed control piston (2) moves downward under the action of the pressure in the driving chamber (11), thereby driving the branch pipe (21) to extend outward; the speed control module (31) controls the outflow speed of the fluid in the containment chamber (12) to control the moving speed of the speed control piston (2); A housing (3) is provided at the lower end of the construction pipe column (1), and the speed control module (31) is provided at the upper part of the housing (3); A curved pipe (32) with a certain angle is arranged in the shell (3), and the lower part of the branch pipe (21) is arranged in the curved pipe (32) and extends outward through the curved pipe (32); The speed control piston (2) is provided with a through hole, and the upper end of the branch pipe (21) is fixedly connected to the hole and passes through the hole so that the inside of the branch pipe is connected to the drive chamber (11); The upper part of the housing (3) is provided with a flow channel communicating with the containment chamber (12) and the outside, and the speed control module (31) is arranged in the flow channel and controls the flow rate of the flow channel; The speed control module (31) comprises a rupture disk and a flow limiting valve group; in an initial state, the rupture disk closes the flow channel; when the pressure in the containment chamber (12) increases to a certain value, the rupture disk breaks under the action of the pressure; and the fluid in the containment chamber (12) flows out through the flow limiting valve group.

2. The branch pipe drilling device with controllable branch pipe extension speed according to claim 1, characterized in that: A nozzle (24) is provided at the lower end of the branch pipe (21), and the elbow (32) and the branch pipe (21) are sealed by a sealing device (33).

3. The branch pipe drilling device with controllable branch pipe extension speed according to claim 2, characterized in that: The construction pipe column (1) comprises a plurality of casing pipes (13), and the casing pipes (13) are connected via couplings (14).

4. The branch pipe drilling device with controllable branch pipe extension speed according to claim 3, characterized in that: A first seal (22) is provided on the outer wall of one end of the speed control piston (2), and a second seal (23) is provided on the other end.

5. The branch pipe drilling device with controllable branch pipe extension speed according to claim 4, characterized in that: The first seal (22) and the second seal (23) are large gap seals.

6. The branch pipe drilling device with controllable branch pipe extension speed according to claim 5, characterized in that: The edges of both ends of the speed control piston (2) are arranged to be chamfered.

7. The branch pipe drilling device with controllable branch pipe extension speed according to claim 6, characterized in that: The end of the shell (3) is an arc-shaped surface, and the outlet of the curved pipe (32) is arranged obliquely on the side of the shell (3).

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