Dynamic pressure balance centralizing assembly applied to extended reach well operation

Abstract

The invention discloses a dynamic pressure balance centralizing assembly applied to extended reach well operation, relates to the technical field of drilling operation, optimizes a centralizing structure aiming at the drilling process of an extended reach well, and is essentially established on the structural basis of an elastic supporting piece, but the difference is that the hydraulic pressure of drilling fluid is fully utilized in the specific operation process, and the hydraulic pressure of the drilling fluid is fully utilized in the specific operation process; the self-swinging semispherical fan is essentially driven to adaptively rotate, the key point is that the self-swinging semispherical fan performs adaptive transposition along the drilling direction, and in the whole operation process, the self-swinging semispherical fan is driven to rotate adaptively by utilizing the pressure of drilling fluid and matching with the elastic supporting force of a gourd spring frame, so that the self-swinging semispherical fan is driven to rotate adaptively. In addition, the rotation action and the transposition action of the self-swinging hemispherical fan are used for driving the bidirectional swing rod to rotate directionally, driving the pressure plate at the corresponding position to be extruded by the pressed plate, and carrying out two actions of secondary supporting or rebound reduction on the gourd spring frame, so that the excessive pressure on the inner wall of the shaft is reduced, and the inner wall of the shaft is prevented from being directly damaged.

Description

Technical Field

[0001] The invention relates to the technical field of drilling operations, and in particular to a dynamic pressure balance righting assembly used in large-reach well operations. Background Art

[0002] Large-reach wells mainly refer to wells with a water-to-vertical ratio of not less than 2 and a measured depth greater than 3000m, or wells with a horizontal displacement greater than 3000m. Their wellbore environment is relatively complex, which is particularly prominent during their drilling operations. A supporting structure is added to conventional drilling tools. Take the relevant contents in publication numbers CN106703695A and CN115506727A as examples.

[0003] It should be noted that conventional straightening structures mainly utilize elastic support force to reduce frictional resistance. However, due to the long and complex wellbore trajectory, the frictional resistance of the drill bit in the wellbore is significantly increased, resulting in increased torque and frictional resistance. Simple elastic structural parts cannot fully adapt to the wellbore environment, and conventional straightening structures may directly destroy the structural stability of the inner wall of the wellbore, making the wellbore unstable and causing the wellbore to collapse or shrink.

[0004] This application proposes a solution to this problem. Summary of the invention

[0005] The purpose of the present invention is to provide a dynamic pressure balance straightening assembly for use in extended reach well operations. For extended reach drilling operations, because the wellbore environment of the extended reach well is complex, the conventional straightening structure mainly relies on the elastic supporting force of the elastic structural parts, cannot fully adapt to the wellbore environment, and even affects the wellbore stability.

[0006] The object of the present invention can be achieved by the following technical scheme: a dynamic pressure balance righting assembly used in extended reach well operation, used in extended reach drilling operation, comprising an outer casing and a gourd spring frame, wherein the gourd spring frame is arranged at an outer position of the outer casing along the center point of the outer casing, and one end of the gourd spring frame is hinged to the outer wall of the outer casing; A self-swinging hemispherical fan is arranged in the inner position of the outer sleeve, a connecting support rod is installed at the lower end position of the self-swinging hemispherical fan, a two-way rocker arm is installed at the lower end position of the connecting support rod, a pressure plate is arranged in the inner position of the outer sleeve corresponding to the two-way rocker arm, a connecting guide rod is installed at the center point of the outer wall of the pressure plate away from the center point of the outer sleeve, and a rubber piston block is installed on the connecting guide rod.

[0007] It is further configured as follows: the outer surface of the self-oscillating hemispherical fan is a spherical surface, and the self-oscillating hemispherical fan is movably connected along the center point of the spherical surface inside the outer sleeve, and the center point of the bidirectional swing rod and the center point of the spherical surface in the self-oscillating hemispherical fan are not on the same axis.

[0008] It is further configured as follows: the self-swinging hemispherical fan and the bidirectional swing rod are arranged in sequence along the drilling direction during the drilling operation.

[0009] It is further configured as follows: the gourd spring frame is double-wavy along the drilling direction during the drilling operation and is respectively configured as a first peak and a second peak, and the cross-section of the first peak and the second peak in the gourd spring frame is curved arch-shaped along the direction away from the center point of the outer sleeve.

[0010] It is further configured as follows: the length of the gourd spring frame is greater than the length of the outer sleeve, and the arc length of the first peak in the gourd spring frame is less than the arc length of the second peak.

[0011] It is further configured as follows: the setting position of the connecting guide rod corresponds to the intersection of the first peak and the second peak, and pin caps are installed on one end position of the connecting guide rod corresponding to the outer wall and the inner wall of the hoist spring frame.

[0012] It is further configured as follows: a through pipe is installed at a position of the outer sleeve corresponding to the connecting guide rod, the rubber piston block is slidingly connected to the inner wall of the through pipe, and a connecting spring is provided at a middle position between the connecting guide rod corresponding to the rubber piston block and the pressure plate.

[0013] It is further configured as follows: the bidirectional swing arm is composed of two top rods, the included angle between the two top rods is greater than ninety degrees and less than one hundred and eighty degrees, and the two top rods have different lengths.

[0014] It is further configured as follows: pressure plates are installed at the end positions of the two jacking rods, the pressure plates are arranged in a circular array along the center point of the outer sleeve, and the arc length of the pressure plates is greater than the arc length of the pressure plates.

[0015] The present invention has the following beneficial effects: 1. The overall structure is still based on the elastic support force of the hoist spring frame to achieve the purpose of straightening, but the difference is that the hydraulic pressure in the process of releasing the drilling fluid is used to drive the self-swinging hemispherical fan to rotate adaptively. Its essence is to drive the bidirectional swing arm to rotate in a directional manner. However, the key lies in the optimization method of the hoist spring frame. The hoist spring frame has two elastic support processes. Its essence is to avoid the hoist spring frame from exerting excessive pressure on the inner wall of the well and destroying the structural stability of the inner wall of the well; 2. Based on the above content, the self-swinging hemispherical fan is optimized again. The self-swinging hemispherical fan can move freely under the action of the gravity field, so that the self-swinging hemispherical fan can be freely displaced in accordance with the drilling direction, and the rotational action caused by the hydraulic pressure of the drilling fluid drives the two-way swing arm to rotate freely. During the action of the two-way swing arm, the two pressure plates thereon rotate in irregular circular or elliptical shapes, driving the pressure plates at the corresponding positions to be squeezed by the pressure plates. In the overall process, the connecting guide rod can be driven to move linearly in the direction pointing to the center of the outer casing, and the hoist spring frame can be supported twice or the rebound can be reduced, thereby reducing the excessive pressure on the inner wall of the wellbore and avoiding direct damage to the inner wall of the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 or the description of the prior art 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 work.

[0017] Figure 1 This is a schematic diagram of the structure of a dynamic pressure balance righting assembly applied to extended reach well operations proposed by the present invention; Figure 2 The invention proposes a dynamic pressure balance righting assembly for use in large displacement well operations. Figure 1 A cross-sectional view of Figure 3 The invention proposes a dynamic pressure balance righting assembly for use in large displacement well operations. Figure 1 A top view of Figure 4 The invention proposes a dynamic pressure balance righting assembly for use in extended reach well operations. Figure 1 sectional view of Figure 5 It is a front view of the outer casing corresponding to the hoist spring frame in the dynamic pressure balance righting assembly applied to the extended reach well operation proposed by the present invention; Figure 6 This is a schematic diagram of the structure of the self-oscillating hemispherical fan in the dynamic pressure balance righting assembly applied to extended reach well operations proposed by the present invention; Figure 7 The invention proposes a dynamic pressure balance righting assembly for use in large displacement well operations. Figure 1 Bottom view of the corresponding bidirectional pendulum.

[0018] In the figure: 1. outer sleeve; 2. hoist spring frame; 3. self-swinging hemispherical fan; 4. connecting support rod; 5. bidirectional swing arm; 6. pressure plate; 7. connecting guide rod; 8. rubber piston block; 9. connecting spring; 10. pressure plate. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0020] Embodiment 1: For extended-reach drilling operations, since the wellbore environment of extended-reach wells is complex, conventional righting structures mainly rely on the elastic support force of elastic structural parts, which cannot fully adapt to the wellbore environment and even affect the wellbore stability. The following technical solutions are proposed: Reference Figures 1 to 7 The dynamic pressure balance righting assembly used for extended reach well operation in this embodiment is used in extended reach drilling operation, and includes an outer casing 1 and a hoist spring frame 2. The hoist spring frame 2 is arranged at an outer position of the outer casing 1 along the center point of the outer casing 1, and one end of the hoist spring frame 2 is hinged to the outer wall of the outer casing 1. A self-swinging hemispherical fan 3 is arranged in the internal position of the outer sleeve 1, a connecting support rod 4 is installed at the lower end position of the self-swinging hemispherical fan 3, a two-way swing rod 5 is installed at the lower end position of the connecting support rod 4, a pressure plate 6 is arranged in the internal position of the outer sleeve 1 corresponding to the two-way swing rod 5, a connecting guide rod 7 is installed at the center point of the outer wall of the pressure plate 6 away from the center point of the outer sleeve 1, a rubber piston block 8 is installed on the connecting guide rod 7, the outer surface of the self-swinging hemispherical fan 3 is a spherical surface, and the self-swinging hemispherical fan 3 is movably connected along the center point of the spherical surface inside the outer sleeve 1, the center point of the two-way swing rod 5 and the center point of the spherical surface in the self-swinging hemispherical fan 3 are not on the same axis, and the self-swinging hemispherical fan 3 and the two-way swing rod 5 are arranged in sequence along the drilling direction in the drilling operation.

[0021] Working principle: First of all, it should be explained that the present invention is mainly aimed at the straightening structure used in the large displacement drilling operation process, because the drilling operation requires continuous output of drilling fluid, and the straightening structure is used to maintain the drilling direction on the one hand, and on the other hand, it cannot directly interfere with the drilling operation process. Figure 1 For example, the outer casing 1 in the overall structure is installed at the rear position of the drilling tool, so it can be understood that the output drilling fluid first passes through the outer casing 1, specifically through the self-swinging hemispherical fan 3 inside it, and then passes through the outer casing 1. Figure 4 and Figure 6For example, since the essence of the self-oscillating hemispherical fan 3 is a turbine fan blade, a spherical outer cover is installed at its outer position to form a self-oscillating hemispherical fan 3, so that the self-oscillating hemispherical fan 3 is driven to rotate adaptively under the hydraulic action of the drilling fluid itself; When the whole structure continues to enter the well, the elastic supporting force of the hoist spring frame 2 is used to straighten and guide the whole outer sleeve 1. For this purpose, it is necessary to ensure that one end of the hoist spring frame 2 is as close to the outer sleeve 1 as possible to avoid direct interference with the movement process of the whole structure.

[0022] Example 2: Explanation of the movement process of the bidirectional swing rod and the self-swinging hemispherical fan: The gourd spring frame 2 is double-wave-shaped along the drilling direction in the drilling operation and is respectively set to the first peak and the second peak, and the cross-section of the first peak and the second peak in the gourd spring frame 2 is curved arch-shaped along the direction away from the center point of the outer sleeve 1, the length of the gourd spring frame 2 is greater than the length of the outer sleeve 1, and the arc length of the first peak in the gourd spring frame 2 is less than the arc length of the second peak, the setting position of the connecting guide rod 7 corresponds to the intersection of the first peak and the second peak, and the connecting guide rod 7 is installed with pin caps at one end position of the outer wall and the inner wall of the gourd spring frame 2 corresponding to the connecting guide rod 7, a through pipe is installed at the position of the outer sleeve 1 corresponding to the connecting guide rod 7, the rubber piston block 8 is slidably connected at the inner wall position of the through pipe, and a connecting spring 9 is provided at the middle position of the connecting guide rod 7 corresponding to the rubber piston block 8 and the pressure plate 6.

[0023] Solution description: As shown in Example 1, Figure 2 For example, when the overall structure is Figure 2 When the position shown in the figure continues to go deeper into the well, because the outer casing 1 in this state remains in a completely vertical state, under the action of the gravity field, the overall bidirectional rocker arm 5 can be set to correspond to the gravity member in the self-swinging hemispherical fan 3, so that it can be understood that the connecting support rod 4 remains vertical. However, due to the large displacement well operation mentioned in the present invention, because the well environment is not completely vertical, the outer casing 1 proposed in the present invention is affected by the well environment and is tilted in an undirected manner. Therefore, under the action of the gravity field, the connecting support rod 4 will undergo an undirected tilting process. This part is the key process of the present invention.

[0024] Embodiment 3: Supplementary explanation is given to Embodiment 2, specifically, the hoist spring frame therein: The bidirectional rocker arm 5 is composed of two top rods, the included angle between the two top rods is greater than ninety degrees and less than one hundred and eighty degrees, and the two top rods have different lengths. Pressure plates 10 are installed at the end positions of the two top rods, and the pressure plates 6 are arranged in a circular array along the center point of the outer sleeve 1, and the arc length of the pressure plate 10 is greater than the arc length of the pressure plate 6.

[0025] The following process is set in combination with Example 1 and Example 2: S1: First refer to Figure 7 This part is based on the state that the overall outer sleeve 1 remains completely horizontal, and also because the center point of the bidirectional swing rod 5 and the center point of the sphere in the self-swinging hemispherical fan 3 are not on the same axis, so that although the bidirectional swing rod 5 is connected to the self-swinging hemispherical fan 3 through the connecting rod 4, in order to meet the "gravity effect" of the gravity field, the connection point between the connecting rod 4 and the bidirectional swing rod 5 is not located at the center point of the bidirectional swing rod 5; In this theoretical state, there is always a pressure plate 10 on one of the top rods in contact with the pressure plate 6, and there is an obvious gap between the pressure plate 10 on the other top rod and the pressure plate 6. Therefore, when the self-swinging hemispherical fan 3 rotates in the initial state, the trajectory of the pressure plates 10 on the two top rods is not a complete circle, but an elliptical movement trajectory. Only one of the pressure plates 10 applies pressure to the pressure plate 6, and no excessive pressure is applied to the pressure plate 6. If one of the hoist spring frames 2 contacts the inner wall of the well and deforms, it will also provide reverse pressure to the pressure plate 6 through the connecting guide rod 7. However, if Figure 7 As shown, each pressure plate 6 is arranged in a circular array along the center point of the outer sleeve 1 and forms a complete circle, so the pressure generated by the deformation process of the gourd spring frame 2 can be directly ignored, specifically the deformation process of the gourd spring frame 2; S2: Based on S1, with reference to Figure 5 , wherein the hoist spring frame 2 first undergoes a deformation process when the second peak contacts the inner wall of the well. Since the second peak first contacts the inner wall of the well, it is squeezed and deformed. Moreover, since a through hole corresponding to the connecting guide rod 7 is provided at the intersection of the first peak and the second peak, and the diameter of the through hole is larger than the outer diameter of the connecting guide rod 7 and smaller than the outer diameter of the pin cap, the first peak undergoes a deformation process again due to the deformation process of the second peak, thereby increasing the curvature of the first peak, thereby completing the support process of the inner wall of the well through the first peak and the second peak. S3: Combining S1 and S2 again, because the wellbore of the extended reach well is not completely vertical, the self-swinging hemispherical fan 3 swings in an undirected manner, thereby driving the bidirectional swing rod 5 to transpose, which may cause one of the pressure plates 10 to provide a large pressure to the pressure plate 6, driving the connecting guide rod 7 to move linearly in a direction away from the center point of the outer casing 1. This process also includes the following contents: S3-1: Figure 2 For example, if the overall outer sleeve 1 deflects slightly in the counterclockwise direction, the pressure plate 10 in the bidirectional swing arm 5 is closer to the pressure plate 6, but the bidirectional swing arm 5 will still continue to rotate through the self-swinging hemispherical fan 3. Figure 5To explain, due to the pressure exerted by the pressure plate 6, the connecting guide rod 7 is driven to move linearly in the direction away from the center point of the outer sleeve 1, and because the hoist spring frame 2 is only hinged at one end and thus has the ability to move, the active action of the connecting guide rod 7 drives the hoist spring frame 2 to further contact the inner wall of the well; S3-2: Taking S3-1 as an example, when the outer sleeve 1 deflects slightly, the hoist spring frame 2 on the left side of the overall outer sleeve 1 is more "easily" in contact with the inner wall of the well, and it is necessary to further limit the length of the top rod on the bidirectional swing rod 5. Specifically, when the pressure plate 10 further squeezes the pressure plate 6 and further applies pressure to the inner wall of the well, in this state, the overall outer sleeve 1 will undergo a "lateral movement" process, and the overall "lateral movement" direction is opposite to the linear movement direction of the connecting guide rod 7, thereby further maintaining the central position of the overall outer sleeve 1; S3-3: Once again Figure 5 For example, the pressure plate 6 is deflected counterclockwise by the pressure of the pressure plate 10, and provides pressure to the hoist spring frame 2 to cause the hoist spring frame 2 to undergo a secondary deformation process. However, it needs to be explained again in conjunction with the drilling fluid: because the drilling fluid used in the drilling process has a relatively high hydraulic pressure, it will provide pressure to the rubber piston block 8 in a direction away from the center point of the outer casing 1. However, mud will continue to be generated during the drilling process, and the mud will provide pressure to the rubber piston block 8 in a direction pointing to the center point of the outer casing 1. Therefore, the overall structure combines the hydraulic pressure of the drilling fluid, the mud pressure, and the pressure generated when contacting the inner wall of the wellbore. Through the coordinated manner of the three, it can better adapt to the wellbore environment and avoid problems such as destroying the structural stability of the inner wall of the wellbore, easy instability of the wellbore wall, and collapse or shrinkage of the wellbore wall.

[0026] In summary, the straightening structure is optimized for the drilling process of large displacement wells. Its essence is still based on the structure of the elastic support parts, but the difference is that the hydraulic pressure of the drilling fluid is fully utilized during the specific operation process. Its essence is to drive the self-swinging hemispherical fan 3 to perform adaptive rotation. The key is that the self-swinging hemispherical fan 3 is adaptively displaced along the drilling direction. In the overall operation process, the pressure of the drilling fluid itself is first utilized, and the elastic supporting force of the hoist spring frame 2 is cooperated. In addition, the rotation and displacement actions of the self-swinging hemispherical fan 3 are also utilized to drive the two-way rocker 5 therein to perform directional rotation, drive the pressure plate 10 at the corresponding position to accept the extrusion of the pressure plate 6, and perform secondary support or reduce the rebound of the hoist spring frame 2, thereby reducing the excessive pressure on the inner wall of the wellbore and avoiding direct damage to the inner wall of the wellbore.

[0027] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0029] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dynamic pressure balance righting assembly used in extended reach well operations, characterized in that: The invention is used in large-displacement drilling operations, and comprises an outer casing (1) and a hoist spring frame (2), wherein the hoist spring frame (2) is arranged at an outer position of the outer casing (1) along the center point of the outer casing (1), and one end of the hoist spring frame (2) is hinged to the outer wall of the outer casing (1); A self-swinging hemispherical fan (3) is arranged in an inner position of the outer sleeve (1), a connecting rod (4) is installed at the lower end of the self-swinging hemispherical fan (3), a bidirectional swing rod (5) is installed at the lower end of the connecting rod (4), a pressure plate (6) is arranged in an inner position of the outer sleeve (1) corresponding to the bidirectional swing rod (5), a connecting guide rod (7) is installed at the center point of the outer wall of the pressure plate (6) away from the center point of the outer sleeve (1), and a rubber piston block (8) is installed on the connecting guide rod (7).

2. The dynamic pressure balance righting assembly for extended reach well operation according to claim 1, characterized in that: The outer surface of the self-oscillating hemispherical fan (3) is a spherical surface, and the self-oscillating hemispherical fan (3) is movably connected along the center point of the spherical surface inside the outer sleeve (1), and the center point of the bidirectional swing rod (5) and the center point of the spherical surface in the self-oscillating hemispherical fan (3) are not on the same axis.

3. The dynamic pressure balance righting assembly for extended reach well operation according to claim 1, characterized in that: The self-swinging hemispherical fan (3) and the bidirectional swing rod (5) are arranged in sequence along the drilling direction during the drilling operation.

4. The dynamic pressure balance righting assembly for extended reach well operation according to claim 1, characterized in that: The hoist spring frame (2) is double-wave shaped along the drilling direction during drilling operation and is respectively provided with a first peak and a second peak, and the cross-section of the first peak and the second peak in the hoist spring frame (2) is in a curved arch shape in a direction away from the center point of the outer sleeve (1).

5. The dynamic pressure balance righting assembly for extended reach well operation according to claim 4, characterized in that: The length of the gourd spring frame (2) is greater than the length of the outer sleeve (1), and the arc length of the first peak in the gourd spring frame (2) is less than the arc length of the second peak.

6. The dynamic pressure balance righting assembly for extended reach well operation according to claim 4, characterized in that: The connection guide rod (7) is arranged at a position corresponding to the intersection of the first peak and the second peak, and a pin cap is installed at one end of the connection guide rod (7) corresponding to the outer wall and the inner wall of the hoist spring frame (2); A through hole corresponding to the connecting guide rod (7) is provided at the intersection of the first peak and the second peak, and the diameter of the through hole is larger than the outer diameter of the connecting guide rod (7) and smaller than the outer diameter of the pin cap.

7. The dynamic pressure balance righting assembly for extended reach well operation according to claim 1, characterized in that: A through pipe is installed at a position of the outer sleeve (1) corresponding to the connecting guide rod (7); the rubber piston block (8) is slidably connected to the inner wall of the through pipe; and a connecting spring (9) is provided at a middle position of the connecting guide rod (7) corresponding to the rubber piston block (8) and the pressure plate (6).

8. The dynamic pressure balance righting assembly for extended reach well operation according to claim 1, characterized in that: The bidirectional swing rod (5) is composed of two top rods, the included angle between the two top rods is greater than ninety degrees and less than one hundred and eighty degrees, and the two top rods have different lengths.

9. The dynamic pressure balance righting assembly for extended reach well operation according to claim 8, characterized in that: Pressure plates (10) are installed at the end positions of the two jacking rods, and the pressure plates (6) are arranged in a circular array along the center point of the outer sleeve (1), and the arc length of the pressure plates (10) is greater than the arc length of the pressure plates (6).

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