A multi-branch production enhancement tool with an extended range correction and guidance tool

Abstract

The present invention discloses a multi-branch production enhancement tool internal extended-range correction guide tool, comprising an anti-torsion outer shell, a drilling fluid circulation channel is arranged in the anti-torsion outer shell, and a plurality of correction guide mechanisms are arranged in the anti-torsion outer shell along the circular array of the drilling fluid circulation channel; the correction guide mechanism comprises a straightening block rotatably connected to the outside of the anti-torsion outer shell, an extended-range booster plate rotatably connected to the inside of the anti-torsion outer shell, and a hydraulic component arranged between the straightening block and the extended-range booster plate; the hydraulic component comprises a hydraulic cylinder body, the hydraulic cylinder body passes through the anti-torsion outer shell and is fixedly connected to the anti-torsion outer shell, the end of the hydraulic cylinder body close to the straightening block is sleeved with a hydraulic rod assembly I, and the end of the hydraulic cylinder body close to the extended-range booster plate is sleeved with a hydraulic rod assembly II. The present invention can correct the deviation and inclination only under the hydraulic action of the drilling fluid without other external power, ensure the linearity of the drilling trajectory, improve the quality of the drilling wellbore, and avoid the spiral wellbore.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas development tools, and in particular to an extended-range deviation correction guide tool in a multi-branch production enhancement tool. Background Art

[0002] With the development of oil and gas fields in my country for decades, most of them have entered the middle and late stages, and the task of increasing production is very severe. At present, most oil and gas fields use perforation and fracturing to artificially create cracks in the process of development to achieve the purpose of increasing production. However, due to the small perforation radius, the mining radius is small and the production capacity is insufficient. In recent years, the application of multi-branch production-increasing drilling tools has solved the problem of small perforation radius, which can produce a larger production-increasing radius and can drill holes in multiple directions at the same time, which has played a great positive role in increasing the production of oil and gas fields in the middle and late stages. However, since the drill pipe used in the multi-branch production-increasing drilling tool is a flexible drill pipe, the anti-deviation straightening can only rely on the hydraulic force of the drilling fluid. The hydraulic force of the drilling fluid can play a role in general homogeneous formations, but in heterogeneous bottom layers, especially soft and hard interlaced formations, relying solely on the hydraulic force of the drill pipe and the drilling fluid is not enough to ensure that the drilling is carried out in a straight line. Therefore, a tool is needed to correct the deviation and inclination to ensure the linearity of the drilling trajectory. At present, tools such as rotary geosteering used in conventional drilling have good correction and guidance effects, but the wellbore drilled by the multi-branch stimulation drilling tool is a small wellbore, and its radius is not enough to accommodate the use of guidance tools such as rotary geosteering. In addition, since the multi-branch stimulation drilling tool remains at the bottom of the well as part of the completion tool after drilling, the use of rotary geosteering tools will greatly increase the cost of well construction. Therefore, we need a tool with a simple structure, low cost of use, and can complete the correction and ensure the linearity of the drilling trajectory by relying solely on its own structure without other energy support. Summary of the invention

[0003] The purpose of the present invention is to provide an extended-range correction and guiding tool within a multi-branch production-increasing tool to solve the problems existing in the above-mentioned prior art. The present invention is installed between the drill bit and the flexible drill pipe, and plays the role of a general stabilizer during conventional drilling. When the drill bit deviates or tilts, and one side of the drill pipe contacts the high side of the well wall, the straightening block is pushed toward the inside of the tool under the action of the high side force of the well wall. The tool changes the stroke of the high and low stroke hydraulic rods to change the area of ​​the drilling fluid intercepted by the internal extended-range booster plate from small to large, and then the straightening block is pushed out of the straightening drill bit through the hydraulic force of the drilling fluid to achieve deviation and inclination correction.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides an extended-range correction and guidance tool in a multi-branch stimulation tool, comprising a torsion-resistant outer shell, a drilling fluid circulation channel is arranged in the torsion-resistant outer shell, and a plurality of correction and guidance mechanisms are arranged in a circular array along the drilling fluid circulation channel on the torsion-resistant outer shell;

[0005] The deviation correction guide mechanism includes a straightening block rotatably connected to the outside of the anti-torsion outer shell, a range-extending and supercharging plate rotatably connected to the inside of the anti-torsion outer shell, and a hydraulic component arranged between the straightening block and the range-extending and supercharging plate;

[0006] The hydraulic assembly includes a hydraulic cylinder body, which passes through the anti-torsion outer shell and is fixedly connected to the anti-torsion outer shell, the end of the hydraulic cylinder body close to the straightening block is sleeved with a hydraulic rod assembly I, and the end of the hydraulic cylinder body close to the range-extending and boosting plate is sleeved with a hydraulic rod assembly II.

[0007] Preferably, the hydraulic cylinder body is provided with a first hydraulic chamber and a second hydraulic chamber, the hydraulic rod assembly I is sleeved in the first hydraulic chamber, and the hydraulic rod assembly II is sleeved in the second hydraulic chamber.

[0008] Preferably, the cross-sectional area of ​​the first hydraulic chamber is greater than the cross-sectional area of ​​the second hydraulic chamber, and hydraulic oil is filled between the hydraulic rod assembly I and the hydraulic rod assembly II.

[0009] Preferably, the hydraulic rod assembly I includes a low-stroke hydraulic rod, one end of the low-stroke hydraulic rod is sleeved in the first hydraulic chamber, the other end of the low-stroke hydraulic rod is fixedly connected with a shoulder, and a return spring is fixedly connected between the shoulder and the hydraulic cylinder body.

[0010] Preferably, a moving slider is fixedly connected to the end of the low-stroke hydraulic rod away from the first hydraulic chamber, a first groove is opened on the side of the straightening block close to the low-stroke hydraulic rod, the moving slider is embedded in the first groove, and the top surface of the moving slider is set as an inclined surface.

[0011] Preferably, the hydraulic component II is a high-stroke hydraulic rod, the end of the high-stroke hydraulic rod away from the hydraulic cylinder body is axially connected to the end of the range-extending booster plate with an extended-range rotating shaft, and the end of the range-extending booster plate away from the high-stroke hydraulic rod is axially connected to the inner side surface of the torsion-resistant outer shell with a lower fixed rotating shaft.

[0012] Preferably, a side of the range-extending and pressure-increasing plate away from the straightening block is provided with a plurality of serrations.

[0013] Preferably, a second groove is formed on the outer side of the anti-torsion outer shell, the straightening block is arranged in the second groove, and an upper fixed rotating shaft is axially connected between the end of the straightening block away from the hydraulic cylinder body and the second groove.

[0014] Preferably, the side of the straightening block away from the second groove is an arc-shaped structure, and the length of the second groove is greater than the length of the straightening block.

[0015] The present invention discloses the following technical effects:

[0016] The use of an extended-range correction guide tool in a multi-branch production-increasing tool involved in the present invention can correct the deviation and inclination only under the hydraulic action of the drilling fluid without other external power, ensure the linearity of the drilling trajectory, improve the quality of the drilling wellbore, and avoid spiral wellbore. The use of an extended-range correction guide tool in a multi-branch production-increasing tool involved in the present invention can effectively ensure the linearity of the drilling trajectory, reduce the redundant trajectory within the operating radius caused by drilling deviation, reduce the drilling operation time, and reduce the drilling cost. At the same time, the use of an extended-range correction guide tool in a multi-branch production-increasing tool involved in the present invention can reduce the impact of uneven formations and gravity on the drilling trajectory, increase the drilling speed, and reduce the drilling cycle. Improve the verticality of the drill bit and the drilled rock surface, ensure the effective drilling time of the drill bit, avoid eccentric wear of the drill bit, and extend the drilling radius. It is an oil and gas production-increasing drilling tool with high use and promotion value.

[0017] The present invention has a simple structure and does not use any electronic components; the present invention has a small radius and is suitable for multi-branch production-increasing drilling; the present invention only uses a mechanical structure, has low processing costs, low use costs, and will not increase the cost of multi-branch production-increasing drilling; at the same time, the use of the present invention can increase the drilling speed of multi-branch production-increasing drilling and reduce the drilling cycle; the use of the present invention can greatly increase the production-increasing radius of the multi-branch production-increasing tool; it is an oil and gas well drilling and development tool with high economic value and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of an extended-range deviation correction and guidance tool in a multi-branch production stimulation tool of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of middle A.

[0021] Among them, 1 is the torsion-resistant outer shell, 2 is the upper fixed rotating shaft, 3 is the lower fixed rotating shaft, 4 is the straightening block, 5 is the range-extending and boosting plate, 6 is the moving slider, 7 is the low-stroke hydraulic rod, 8 is the return spring, 9 is the high-stroke hydraulic rod, 10 is the range-extending rotating shaft, 11 is the hydraulic cylinder body, 12 is the first hydraulic chamber, 13 is the second hydraulic chamber, 14 is the second groove, 15 is the sawtooth, 16 is the first groove, and 17 is the boss. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figure 1-2 The present invention provides an extended-range correction and guiding tool in a multi-branch production-increasing tool, comprising a torsion-resistant outer shell 1, wherein a drilling fluid circulation channel is arranged in the torsion-resistant outer shell 1, and a plurality of correction and guiding mechanisms are arranged in a circular array along the drilling fluid circulation channel. By designing a hollow drilling fluid circulation channel, it is possible to ensure that the drilling fluid reaches the bottom of the well smoothly, provide sufficient drilling fluid for rock breaking during drilling, and discharge the cuttings generated during drilling back out of the wellhead. In this embodiment, three correction and guiding mechanisms are arranged.

[0025] The deviation correction guide mechanism includes a straightening block 4 rotatably connected to the outside of the torsion-resistant outer shell 1, an extended-range booster plate 5 rotatably connected to the inside of the torsion-resistant outer shell 1, and a hydraulic component arranged between the straightening block 4 and the extended-range booster plate 5. In this embodiment, three deviation correction guide mechanisms are arranged, and three straightening blocks 4 for pushing are evenly designed correspondingly. When drilling deviates from the original route, the high side of the well wall squeezes the straightening block 4 to move inward, thereby pushing the low-stroke hydraulic rod 7 to move inward;

[0026] The hydraulic assembly includes a hydraulic cylinder body 11, which passes through the anti-torsion outer shell 1 and is fixedly connected to the anti-torsion outer shell 1. The end of the hydraulic cylinder body 11 close to the straightening block 4 is sleeved with a hydraulic rod assembly I, and the end of the hydraulic cylinder body 11 close to the range-extending and boosting plate 5 is sleeved with a hydraulic rod assembly II.

[0027] In a further preferred embodiment, a first hydraulic chamber 12 and a second hydraulic chamber 13 are provided in the hydraulic cylinder body 11 , the hydraulic rod assembly I is sleeved in the first hydraulic chamber 12 , and the hydraulic rod assembly II is sleeved in the second hydraulic chamber 13 .

[0028] In a further preferred embodiment, the cross-sectional area of ​​the first hydraulic chamber 12 is greater than the cross-sectional area of ​​the second hydraulic chamber 13, and hydraulic oil is filled between the hydraulic rod assembly I and the hydraulic rod assembly II, so that the force transmission between the hydraulic rod assembly I and the hydraulic rod assembly II is achieved through the hydraulic oil.

[0029] In a further preferred embodiment, the hydraulic rod assembly 1 includes a low-stroke hydraulic rod 7, one end of which is sleeved in the first hydraulic chamber 12, and the other end of which is fixedly connected with a boss 17, and a return spring 8 is fixedly connected between the boss 17 and the hydraulic cylinder body 11. In this embodiment, the volume of the first hydraulic chamber 12 is twice the volume of the second hydraulic chamber 13. When the tool straightening block 4 contacts the high side of the well wall, the straightening block 4 moves toward the tool axis under the action of force to compress the low-stroke hydraulic rod 7 to shrink inward. Since the volume of the first hydraulic chamber 12 is twice the volume of the second hydraulic chamber 13, the high-stroke hydraulic rod 9 extends a longer distance under the action of hydraulic pressure, thereby pushing the range-extending booster plate 5 to generate a larger intercepting area. As the intercepting area increases, the range-extending booster plate 5 bears a greater force of the drilling fluid, and the range-extending booster plate 5 drives the high-stroke hydraulic rod 9 to move outward, and then pushes the straightening block 4 to reset under the action of the low-stroke hydraulic rod 7 and the return spring 8, and then the straightening block 4 pushes the high side of the well wall to correct the deviation and tilt.

[0030] According to a further preferred embodiment, a moving slider 6 is fixedly connected to the end of the low-stroke hydraulic rod 7 away from the first hydraulic chamber 12, and a first groove 16 is formed on the side of the straightening block 4 close to the low-stroke hydraulic rod 7. The moving slider 6 is embedded in the first groove 16, and the top surface of the moving slider 6 is set as an inclined surface. The design of the inclined surface can better transmit the force transmitted by the range-extending and boosting plate 5 through the moving slider 6 to the high side of the well wall through the straightening block 4 to correct the deviation and inclination.

[0031] According to a further preferred embodiment, the hydraulic component II is a high-stroke hydraulic rod 9, the end of the high-stroke hydraulic rod 9 away from the hydraulic cylinder body 11 is axially connected to the end of the range-extending booster plate 5 with an extended-range rotating shaft 10, and the end of the range-extending booster plate 5 away from the high-stroke hydraulic rod 9 is axially connected to the inner side surface of the torsion-resistant outer shell 1 with a lower fixed rotating shaft 3.

[0032] A further preferred solution is that a plurality of serrations 15 are provided on the side of the range extender and booster plate 5 away from the straightening block 4. The range extender and booster plate 5 of the present invention is designed with a serrated surface. When the range extender and booster plate 5 is pushed out, the serrated surface can increase the equivalent vertical cross-sectional area of ​​the drilling fluid and increase the force of the drilling fluid on the range extender and booster plate 5.

[0033] In a further preferred embodiment, a second groove 14 is formed on the outer side of the torsion-resistant outer shell 1 , the straightening block 4 is arranged in the second groove 14 , and an upper fixed rotating shaft 2 is axially connected between the end of the straightening block 4 away from the hydraulic cylinder body 11 and the second groove 14 .

[0034] A further preferred solution is that the side of the straightening block 4 away from the second groove 14 is an arc-shaped structure, and the arc-shaped structure is a nearly cylindrical outer surface structure. The length of the second groove 14 is greater than the length of the straightening block 4. Since the inner diameter of the multi-branch production enhancement tool is relatively small, conventional deflection correction and guidance tools cannot be used, especially rotary guidance tools equipped with integrated control circuits and hydraulic drive devices. Therefore, a tool is needed that can correct the direction when drilling deviates from the original line through its own structural design and push the tool back to the original line. The present invention is evenly designed with three straightening blocks 4 for pushing. When drilling deviates from the original route, the high side of the well wall squeezes the straightening block 4 to move inward, thereby pushing the hydraulic rod inward. The stroke change of the high and low stroke hydraulic rods 7 increases the interception angle of the range-extending booster plate 5 with the drilling fluid, and the sawtooth 15-shaped surface design on the range-extending booster plate 5 increases the force of the drilling fluid on the range-extending booster plate 5, thereby transmitting the force to the straightening block 4 to push the well wall to correct the deviation and inclination. The shell of the present invention is designed with a space for the straightening block 4 to be retracted. At the same time, the straightening block 4 adopts a nearly cylindrical outer surface design. When the tool encounters an obstacle, the straightening block 4 can be retracted to the shell. In the space designed for the retraction of the straightening block 4, there will be no jamming or other complex situations due to the inability to retract the straightening block 4. At the same time, the straightening block 4 adopts the upper shaft fixing method, and the well wall will not be damaged or even the drill will be stuck due to the tool when the drill is recovered. The components used in the patent of the present invention are all integrally formed and have high strength. The protruding parts of the shell adopt a rounded design to prevent the tool from scratching the well wall and ensure the well wall is smooth.

[0035] The working principle of the extended-range correction guide tool in a multi-branch production increase tool of the present invention is as follows: the straightening block 4 is installed in the order from zero to whole, the extended-range booster plate 5 is installed on the inner side of the torsion-resistant outer shell 1 through the upper fixed rotating shaft 2, the high-stroke hydraulic rod 9 is connected to the extended-range booster plate 5 through the extended-range rotating shaft 10, the low-stroke hydraulic rod 7 is embedded in the first groove 16 through the moving slider 6 to achieve connection with the straightening block 4, the reset spring 8 is installed between the boss 17 at the end of the low-stroke hydraulic rod 7 and the hydraulic cylinder body 11, the low-stroke hydraulic rod 7 and the high-stroke hydraulic rod 9 are installed on both sides of the hydraulic cylinder body 11, and are respectively sleeved in the first hydraulic chamber 12 and the second hydraulic chamber 13, and the hydraulic cylinder body 11 passes through the torsion-resistant outer shell 1 and is threadedly connected to the torsion-resistant outer shell 1.

[0036] During construction, this tool is installed near the drill bit. The patent of the present invention provides a multi-branch stimulation tool with an extended-range deviation correction guide tool. The present invention uses the hydraulic action of the drilling fluid to impact the extended-range pressure plate 5, and the high-stroke hydraulic rod 9 and the low-stroke hydraulic rod 7 transmit the force of the drilling fluid on the extended-range pressure plate 5 to the straightening block 4, and the straightening block 4 pushes the high side of the well wall to correct the deviation and inclination during the drilling process.

[0037] The patent of the present invention provides an extended-range deviation correction and guiding tool within a multi-branch production-increasing tool. The tool adopts a hydraulic and mechanical structural design, and has the characteristics of simple structure and easy installation. The parts such as the straightening block 4 where the tool contacts the well wall are processed with cemented carbide, which has good wear resistance. The use cost of the present invention is low, and the use of the present invention will not incur large expenses. The tool structure is reasonably designed and does not occupy a large space, and will not have any negative impact on multi-branch production-increasing drilling. The present invention has strong applicability to working conditions, and the downhole pressure and temperature will not have a significant impact on the use effect of the tool, and the tool has high safety and reliability.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-branch production enhancement tool internal extended range correction guide tool, characterized by: It comprises an anti-torsion outer shell (1), wherein a drilling fluid circulation channel is arranged in the anti-torsion outer shell (1), and a plurality of deviation correction guide mechanisms are arranged in a circular array along the drilling fluid circulation channel on the anti-torsion outer shell (1); The deviation correction and guiding mechanism comprises a straightening block (4) rotatably connected to the outside of the anti-torsion outer shell (1), a range-extending and pressure-increasing plate (5) rotatably connected to the inside of the anti-torsion outer shell (1), and a hydraulic assembly arranged between the straightening block (4) and the range-extending and pressure-increasing plate (5); when drilling deviates from the original route, the high side of the well wall presses the straightening block (4) to move inwards; The hydraulic assembly comprises a hydraulic cylinder body (11), the hydraulic cylinder body (11) passes through the anti-torsion outer shell (1) and is fixedly connected to the anti-torsion outer shell (1), the end of the hydraulic cylinder body (11) close to the straightening block (4) is sleeved with a hydraulic rod assembly I, and the end of the hydraulic cylinder body (11) close to the range-extending and pressure-increasing plate (5) is sleeved with a hydraulic rod assembly II.

2. According to claim 1, a multi-branch production enhancement tool internal extended range correction guide tool is characterized by: The hydraulic cylinder body (11) is provided with a first hydraulic chamber (12) and a second hydraulic chamber (13); the hydraulic rod assembly I is sleeved in the first hydraulic chamber (12), and the hydraulic rod assembly II is sleeved in the second hydraulic chamber (13).

3. A multi-branch production enhancement tool internal extended range correction guide tool according to claim 2, characterized in that: The cross-sectional area of ​​the first hydraulic chamber (12) is greater than the cross-sectional area of ​​the second hydraulic chamber (13), and hydraulic oil is filled between the hydraulic rod assembly I and the hydraulic rod assembly II.

4. A multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 2, characterized in that: The hydraulic rod assembly I comprises a low-stroke hydraulic rod (7), one end of which is sleeved in the first hydraulic chamber (12), the other end of which is fixedly connected with a boss (17), and a return spring (8) is fixedly connected between the boss (17) and the hydraulic cylinder body (11).

5. The multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 4, characterized in that: A moving slider (6) is fixedly connected to the end of the low-stroke hydraulic rod (7) away from the first hydraulic chamber (12), and a first groove (16) is provided on the side of the straightening block (4) close to the low-stroke hydraulic rod (7). The moving slider (6) is embedded in the first groove (16), and the top surface of the moving slider (6) is set as an inclined surface.

6. The multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 1, characterized in that: The hydraulic rod assembly II is a high-stroke hydraulic rod (9), the end of the high-stroke hydraulic rod (9) away from the hydraulic cylinder body (11) is axially connected to the end of the range-extending and boosting plate (5) by an extended-range rotating shaft (10), and the end of the range-extending and boosting plate (5) away from the high-stroke hydraulic rod (9) is axially connected to the inner side surface of the torsion-resistant outer shell (1) by a lower fixed rotating shaft (3).

7. The multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 1, characterized in that: A plurality of saw teeth (15) are provided on the side of the range-extending and pressure-increasing plate (5) away from the straightening block (4).

8. The multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 1, characterized in that: A second groove (14) is provided on the outer side of the torsion-resistant outer shell (1), the straightening block (4) is arranged in the second groove (14), and an upper fixed rotating shaft (2) is axially connected between the end of the straightening block (4) away from the hydraulic cylinder body (11) and the second groove (14).

9. The multi-branch production enhancement tool internal extended range deviation correction guide tool according to claim 8, characterized in that: The side of the straightening block (4) away from the second groove (14) is an arc-shaped structure, and the length of the second groove (14) is greater than the length of the straightening block (4).

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