Sleeve lowering guiding and righting structure for highly-deviated borehole construction

Abstract

The invention discloses a casing lowering guiding and righting structure for highly-deviated borehole construction, and relates to the technical field of righting structures, righting principles adopted in casing lowering operation and well drilling operation are consistent, but the righting principles are different in that an active deformation process is generated due to the influence of a well environment in a matched casing lowering process; in the bending process of the inner sleeve, the co-moving spring frame and the stress spring frame, the co-moving spring frame serves as a key structure, the purpose of automatic righting is achieved through the co-moving spring frame, and it needs to be explained that in the bending process of the whole structure, the deformation process of the co-moving spring frame and the stress spring frame is further limited through the connecting cable assembly; the essence is that the co-moving spring frame is subjected to two actions of direction limitation and force limitation from the stress spring frame and is subjected to an active limitation process of the connecting cable assembly, the stress spring frame is also subjected to a limitation process of the connecting cable assembly, and the overall deformation process is matched with a casing lowering process in an interactive mode to realize righting and guiding.

Description

Technical Field

[0001] The invention relates to the technical field of righting structures, and in particular to a casing lowering and guiding righting structure for high-angle wellbore construction. Background Art

[0002] The casing lowering operation during the drilling construction process is explained. Its essence is to reinforce the well wall (cementing), which is mainly done with special equipment. The relevant content in the publication number CN118601490A can be referred to as an example. The process of lowering the casing is basically similar to the essence of the drilling operation, avoiding direct damage to the wellbore and ensuring the operation requirements (lowering position, drilling angle).

[0003] In the process of lowering the casing, it is necessary to add a straightening structure to position the casing. However, for highly inclined wells, the wellbore environment is complex and the conventional straightening structure mainly uses its own elastic support force and is not fully applicable to the wellbore environment in highly inclined wells, which directly affects the connection position of each section of the casing. For example, misalignment occurs when the casing is docked, and there is a significant collision with the wellbore wall when the casing is lowered. It should also be noted that the straightening structure must ensure that the casing is centered and also avoid the straightening structure increasing the resistance when the casing is lowered. This application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a casing lowering guiding and straightening structure for high-angle wellbore construction, and is described with respect to cementing operations in high-angle wells. Because the wellbore environment of high-angle wells is complex, it is difficult to maintain or change the lower position during the casing lowering process, which directly affects the casing docking quality and even causes related problems of damaging the wellbore environment.

[0005] The object of the present invention can be achieved by the following technical scheme: a casing lowering guiding and straightening structure for high-angle wellbore construction, the straightening structure is arranged at the lower side of the casing, and the straightening structure includes an inner sleeve, a spring frame assembly and a connecting cable assembly, the spring frame assembly is composed of a force spring frame and a cooperative spring frame, the connecting cable assembly is arranged at a position between the corresponding spring frame assembly and the inner sleeve, and the connecting cable assembly includes a directional grommet, a directional sleeve, a ball and a bidirectional spring rod; The cooperative spring frame is installed at the external position of the force spring frame, and a deformation limiting portion corresponding to the connecting cable assembly is provided at the external position of the force spring frame corresponding to the cooperative spring frame in the vertical direction. A yielding ball groove corresponding to the deformation limiting portion is provided at the outer wall position of the inner sleeve. One end of the directional sleeve is installed on the cooperative spring frame, and the directional sleeve and the force spring frame are slidably connected.

[0006] It is further configured that: the middle end portion of the inner sleeve is in a curved arch shape along the position pointing to the center point of the inner sleeve, and the spring frame assembly is arranged in a ring array along the center point of the inner sleeve.

[0007] It is further configured that: the cross sections of the force spring frame and the cooperative spring frame are in a curved arch shape along a position away from the center point of the inner sleeve, and the curvature of the cooperative spring frame is greater than the curvature of the force spring frame.

[0008] It is further configured as follows: the horizontal planes of the center points of the force spring frame, the cooperative spring frame and the inner sleeve along the vertical direction are in the same plane, the upper end position of the force spring frame and the inner sleeve are fixedly connected, and the lower end position of the force spring frame and the inner sleeve are slidably connected along the vertical direction.

[0009] It is further configured as follows: a locking ring corresponding to the lower end portion of the force spring frame is arranged at the lower end position of the inner sleeve.

[0010] It is further configured as follows: the deformation limiting portions are linearly and equidistantly distributed along the vertical direction, and the position of one of the deformation limiting portions is located on the center point plane of the inner sleeve along the vertical direction, and the directional grommet is arranged in the yielding ball groove.

[0011] It is further configured as follows: a connecting rod is slidably installed on the directional sleeve along the direction pointing to the inner sleeve, and a force spring is installed between the inside of the directional sleeve and one end of the connecting rod, and the other end of the connecting rod matches the bidirectional spring rod.

[0012] It is further configured as follows: the balls are mounted on both ends of the bidirectional spring rod, and the balls are slidably connected to the directional eyelet, and the setting position of the bidirectional spring rod matches the setting position of the force spring frame.

[0013] It is further configured as follows: the other end of the connecting rod is arranged at the middle position of the bidirectional spring rod, and a ball sleeve is installed at the other end of the connecting rod, a rotor ball corresponding to the ball sleeve is installed at the middle position of the bidirectional spring rod, and the ball is movably connected in the give-way ball groove.

[0014] The present invention has the following beneficial effects: The overall structure is a straightening structure set up for the casing lowering operation, specifically guiding the casing lowering process. For this purpose, the overall structure is firstly limited in its setting position relative to the casing, specifically reflected in the lower position of one of the casings. Its essence is that the upper position of the inner sleeve is in a fixed connection state with the lower position of one of the casings. In the process of lowering the casing, the cooperative spring frame and the force spring frame are affected by the wellbore environment and deform and bend, ensuring that the casing is placed in the designated position in a relatively centered state. The cooperative spring frame is a key elastic support structure, and it also needs to be simultaneously subjected to the elastic restriction effect of the force spring frame. Based on the above content, the overall structure first limits the structural appearance of the cooperative spring frame, the force spring frame and the inner sleeve, so as to limit the bending deformation direction of the three. A connecting rope assembly is further arranged according to the setting position of the three. In essence, it does not serve as a connecting structure of the three, but as a "transfer structure" of stress when the three are deformed. Specifically, under the influence of the environment of the highly inclined shaft, the three first undergo a relatively independent bending deformation process, but further interfere with the deformation process of the three through the stress transfer process, so as to ensure that the cooperative spring frame can better contact the well wall, but will not cause excessive pressure on the well wall and affect the structural stability of the inner wall of the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 This is a structural schematic diagram of a casing lowering guiding and straightening structure for high-angle wellbore construction proposed by the present invention; Figure 2 This is a schematic diagram of the structure of an inner sleeve in a casing lowering guide and straightening structure for high-angle wellbore construction proposed by the present invention; Figure 3 A schematic diagram of the structure of a spring frame assembly in a casing lowering guide and straightening structure for high-angle wellbore construction proposed by the present invention; Figure 4 A front view of a spring frame assembly corresponding to an inner sleeve in a casing lowering guide and straightening structure for high-angle wellbore construction proposed by the present invention; Figure 5 This is a structural schematic diagram of a connecting cable assembly in a casing lowering guide and straightening structure for high-angle wellbore construction proposed by the present invention; Figure 6 The invention provides a casing lowering guide and straightening structure for high-angle wellbore construction. Figure 5 A top view of Figure 7 The invention provides a casing lowering guide and straightening structure for high-angle wellbore construction. Figure 5 Cross-section of the directional casing.

[0017] In the figure: 1, inner sleeve; 101, give way ball groove; 2, force spring frame; 201, deformation limiting part; 3, cooperative spring frame; 4, locking ring; 6, directional cable ring; 5, directional sleeve; 7, ball; 8, bidirectional spring rod; 9, force spring; 10, connecting rod. DETAILED DESCRIPTION

[0018] 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.

[0019] Embodiment 1: The cementing operation in a highly deviated well is described. Since the wellbore environment of a highly deviated well is complex, it is difficult to maintain or change the lower position during the casing lowering process, which directly affects the casing docking quality and even causes problems related to the damage to the wellbore environment. The following technical solutions are proposed: Reference Figures 1 to 7 In this embodiment, a casing lowering guiding and straightening structure for high-angle wellbore construction is provided. The straightening structure is arranged at the lower side of the casing, and the straightening structure comprises an inner sleeve 1, a spring frame assembly and a connecting cable assembly. The spring frame assembly comprises a force spring frame 2 and a cooperative spring frame 3. The connecting cable assembly is arranged at a position between the corresponding spring frame assembly and the inner sleeve 1, and the connecting cable assembly comprises a directional cable ring 6, a directional casing 5, a ball 7 and a bidirectional spring rod 8; The cooperative spring frame 3 is installed at the external position of the force spring frame 2. The force spring frame 2 is provided with a deformation limiting portion 201 corresponding to the connecting cable assembly at the external position corresponding to the cooperative spring frame 3 in the vertical direction. The outer wall of the inner sleeve 1 is provided with a yielding ball groove 101 corresponding to the deformation limiting portion 201. One end of the directional sleeve 5 is installed on the cooperative spring frame 3, and the directional sleeve 5 and the force spring frame 2 are slidably connected. The middle end of the inner sleeve 1 is in a curved arch shape along the position pointing to the center point of the inner sleeve 1. The spring frame assembly is arranged in a ring array along the center point of the inner sleeve 1. The cross-sections of the force spring frame 2 and the cooperative spring frame 3 are in a curved arch shape along the position away from the center point of the inner sleeve 1, and the bending curvature of the cooperative spring frame 3 is greater than the bending curvature of the force spring frame 2.

[0020] Basic principle: The overall structure has the same purpose as the conventional righting structure, which is to ensure the centering degree. However, the present invention is mainly aimed at the cementing process in the large inclined well operation. Its essence is to lower a number of casings according to the process requirements. For this, a relevant righting structure is proposed for the casing lowering process. For this, the setting position of the righting structure proposed by the present invention is first limited. Specifically, it is set at the lower side of one of the casings. The wellbore is still supported by elastic support members, but it is different from the conventional righting structure as follows: S1: The whole structure continues to move downward to the designated position along with the casing. In the initial state, because the lower side of the force spring frame 2 maintains a sliding connection with the inner sleeve 1, it can be understood that the bending arc of the force spring frame 2 in the initial state is the largest, until it contacts the inner wall of the well and deforms to reduce the bending arc. Specifically, the lower side of the force spring frame 2 slides with the inner sleeve 1, the purpose of which is to prevent the force spring frame 2 from directly exerting a large pressure on the well and causing damage to the stability of the inner wall of the well; S2: Based on S1, in essence, the cooperative spring frame 3 directly contacts the inner wall of the well and actively deforms and bends, but the cooperative spring frame 3 is interfered by the force spring frame 2. It can be understood that when the cooperative spring frame 3 is greatly bent, it will cause greater pressure on the well, and the force spring frame 2 needs to bear the excessive pressure generated by the cooperative spring frame 3; S3: It should also be noted that: due to the influence of the large inclined shaft environment, the inner sleeve 1 will also undergo an adaptability bending process, but the bending process of the inner sleeve 1 will also indirectly affect the bending deformation process of the load-bearing spring frame 2, so that the three bending processes of the overall structure will influence and interfere with each other, making the overall structure better cooperate with the large inclined shaft environment.

[0021] Embodiment 2: This embodiment provides additional explanations on the bending process of the force spring frame 2 and the cooperative spring frame 3: The horizontal planes of the center points of the force spring frame 2, the cooperative spring frame 3 and the inner sleeve 1 in the vertical direction are in the same plane, the upper end of the force spring frame 2 is fixedly connected to the inner sleeve 1, and the lower end of the force spring frame 2 is slidably connected to the inner sleeve 1 in the vertical direction, and a locking ring 4 corresponding to the lower end of the force spring frame 2 is arranged at the lower end of the inner sleeve 1, the deformation limiting parts 201 are linearly equidistantly distributed in the vertical direction, and one of the deformation limiting parts 201 is located on the plane of the center point of the inner sleeve 1 in the vertical direction, and the directional grommet 6 is arranged in the yielding ball groove 101.

[0022] Solution Description: Combined Figure 2 and Figure 4 To explain, the inner sleeve 1 first has a certain curvature, and a plurality of through slots are opened in the middle position to ensure that the inner sleeve 1 has bending influence ability, and the bending deformation process of the force spring frame 2 and the cooperative spring frame 3 is supplemented as follows: S4: When the cooperative spring frame 3 contacts the inner wall of the well, the cooperative spring frame 3 is compressed and deformed, which is manifested as a reduction in the curvature. In this process, because the cooperative spring frame 3 is installed on the force spring frame 2, the force spring frame 2 will also be passively bent due to the interference of the cooperative spring frame 3. It should also be noted that: although the inner sleeve 1 has the ability to bend and deform, because the lower end of the force spring frame 2 and the inner sleeve 1 have the ability to slide, the bending process of the inner sleeve 1 will not directly interfere with the force spring frame 2. For this reason, it is necessary to limit the force spring frame 2, the cooperative spring frame 3 and the inner sleeve 1 to soft materials with elasticity. S5: In this regard, a plurality of ball grooves 101 are provided on the outer wall of the inner sleeve 1 to ensure that the inner sleeve 1 can bend and deform freely. However, the key lies in the deformation limiting portion 201 provided on the force spring frame 2. Under normal conditions, when the force spring frame 2 and the cooperative spring frame 3 are both in an arch shape bending outward, when the curvature of the cooperative spring frame 3 decreases, the curvature of the cooperative spring frame 3 will also decrease. However, the bending direction of the force spring frame 2 is further changed by the three deformation limiting portions 201. This can be directly understood as follows: when the force spring frame 2 is affected by the cooperative spring frame 3, the bending process in a single direction will not occur, but the bending process in multiple directions will be optimized in coordination with the bending process of the inner sleeve 1, specifically, the bending process is further coordinated with the environment of the large inclined shaft.

[0023] Embodiment 3: An associated connecting cable component is further proposed to supplement the deformation process in Embodiment 1 and Embodiment 2: A connecting rod 10 is slidably installed on the directional sleeve 5 in the direction pointing to the inner sleeve 1, and a force spring 9 is installed between the inside of the directional sleeve 5 and one end of the connecting rod 10, the other end of the connecting rod 10 matches the two-way spring rod 8, the ball 7 is installed at both ends of the two-way spring rod 8, and the ball 7 is slidably connected on the directional eyelet 6, the setting position of the two-way spring rod 8 matches the setting position of the force spring frame 2, the other end of the connecting rod 10 is set at the middle position of the two-way spring rod 8, and a ball sleeve is installed at the other end of the connecting rod 10, the middle position of the two-way spring rod 8 is installed with a rotor ball corresponding to the ball sleeve, and the ball 7 is movably connected in the give-way ball groove 101.

[0024] Solution Description: Combined Figure 5 to Figure 7It is to be noted again that: each yielding ball groove 101 is used to place a ball 7, ensuring that the ball 7 can slide freely in the yielding ball groove 101, and each ball 7 is connected in series through a directional grommet 6, and ensuring that the ball 7 can also slide in the directional grommet 6, and combined with the content of S5 in the second embodiment, because the inner sleeve 1 needs to bend and deform in a small amplitude, it is necessary to further limit the outer diameter of the ball 7, specifically, the outer diameter of the ball 7 is smaller than the inner diameter of the yielding ball groove 101, but the ball 7 will not be separated from the yielding ball groove 101, the purpose of which is to prevent the ball 7 from completely interfering with the deformation process of the inner sleeve 1; However, the key point to be explained is that the directional sleeve 5 connected to each of the cooperative spring frames 3 is a key structure for transmitting the stress on the cooperative spring frame 3. The essence is that the cooperative spring frame 3 is compressed and deformed, causing the directional sleeve 5 to move linearly in the direction of the center point of the inner sleeve 1, and combined with Figure 7 The linear movement of the directional sleeve 5 will not directly affect the force spring frame 2. Therefore, it is necessary to ensure that a through hole larger than the outer diameter of the directional sleeve 5 is provided on the force spring frame 2. In this process, the force spring 9 inside is compressed and generates pressure on the connecting rod 10 in the direction of the center point of the inner sleeve 1, specifically on the two-way spring rod 8. Because the ball sleeve connected to the connecting rod 10 and the rotor ball on the two-way spring rod 8 are not completely fixed, they have a certain degree of mobility. However, the key is that the two-way spring rod 8 is subjected to the pressure from the connecting rod 10 and undergoes an outward expansion type bending process, so that Figure 6 For a single bidirectional spring rod 8, the two balls 7 thereon move away from each other in the yielding ball groove 101, and this process of the two balls 7 moving away from each other will also interfere with the deformation process of the inner sleeve 1. The key technical point of the overall structure is: the purpose of straightening the casing is achieved by contacting the large inclined shaft with the cooperative spring frame 3, but no large pressure is generated on the inner wall of the shaft.

[0025] In summary, the casing lowering operation and the straightening principle used in the drilling operation are consistent, but there is a difference in that: in the process of cooperating with the casing lowering, an active deformation process occurs under the influence of the wellbore environment, which is specifically manifested in the bending process of the inner sleeve 1, the cooperative spring frame 3 and the force spring frame 2. The cooperative spring frame 3 is taken as the key structure, and the purpose of automatic straightening is achieved through the cooperative spring frame 3. It should be noted that: in the bending process of the overall structure, the deformation process of the cooperative spring frame 3 and the force spring frame 2 is further restricted by the connecting cable assembly. Its essence is that the cooperative spring frame 3 is subject to the two actions of direction restriction and force restriction from the force spring frame 2 and the active restriction process of the connecting cable assembly, and the force spring frame 2 is also subject to the restriction process of the connecting cable assembly. The overall deformation process is coordinated with the casing lowering process in an interactive manner to achieve straightening guidance.

[0026] 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.

[0027] 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.

[0028] 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 casing lowering guiding and straightening structure for high-angle wellbore construction, characterized in that: The straightening structure is arranged at a lower side of the sleeve, and comprises an inner sleeve (1), a spring frame assembly and a connecting cable assembly, wherein the spring frame assembly is composed of a force-bearing spring frame (2) and a cooperating spring frame (3), and the connecting cable assembly is arranged at a position between the corresponding spring frame assembly and the inner sleeve (1), and the connecting cable assembly comprises a directional grommet (6), a directional sleeve (5), a ball (7) and a bidirectional spring rod (8); The cooperative spring frame (3) is mounted on an external position of the force spring frame (2); a deformation limiting portion (201) corresponding to the connecting cable assembly is provided at an external position of the force spring frame (2) corresponding to the cooperative spring frame (3) in a vertical direction; a ball groove (101) corresponding to the deformation limiting portion (201) is provided on an outer wall of the inner sleeve (1); one end of the directional sleeve (5) is mounted on the cooperative spring frame (3), and the directional sleeve (5) and the force spring frame (2) are slidably connected.

2. A casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 1, characterized in that: The middle end portion of the inner sleeve (1) is in a curved arch shape along a position pointing to the center point of the inner sleeve (1), and the spring frame components are arranged in a circular array along the center point of the inner sleeve (1).

3. The casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 1 is characterized in that: The cross-sections of the force spring frame (2) and the cooperative spring frame (3) are in a curved arch shape along a position away from the center point of the inner sleeve (1), and the curvature of the cooperative spring frame (3) is greater than the curvature of the force spring frame (2).

4. A casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 3, characterized in that: The horizontal planes of the center points of the stressed spring frame (2), the cooperative spring frame (3) and the inner sleeve (1) along the vertical direction are in the same plane, the upper end of the stressed spring frame (2) and the inner sleeve (1) are fixedly connected, and the lower end of the stressed spring frame (2) and the inner sleeve (1) are slidably connected along the vertical direction.

5. A casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 4, characterized in that: A locking ring (4) is provided at the lower end of the inner sleeve (1) and corresponds to the lower end portion of the force-bearing spring frame (2).

6. The casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 1, characterized in that: The deformation limiting portions (201) are linearly and equidistantly distributed along the vertical direction, and one of the deformation limiting portions (201) is located on the center point plane of the inner sleeve (1) along the vertical direction, and the directional grommet (6) is arranged in the clearance ball groove (101).

7. A casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 6, characterized in that: The directional sleeve (5) is slidably mounted with a connecting rod (10) in a direction pointing toward the inner sleeve (1), and a force spring (9) is installed between the interior of the directional sleeve (5) and one end of the connecting rod (10), and the other end of the connecting rod (10) matches the bidirectional spring rod (8).

8. The casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 7, characterized in that: The balls (7) are mounted at both ends of the bidirectional spring rod (8), and the balls (7) are slidably connected to the directional grommet (6). The setting position of the bidirectional spring rod (8) matches the setting position of the force spring frame (2).

9. The casing lowering guiding and straightening structure for high-angle wellbore construction according to claim 7, characterized in that: The other end of the connecting rod (10) is arranged at the middle section of the bidirectional spring rod (8), and a ball sleeve is installed at the other end of the connecting rod (10), a rotor ball corresponding to the ball sleeve is installed at the middle section of the bidirectional spring rod (8), and the ball (7) is movably connected in the yielding ball groove (101).

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