Bearing nipple device for orientation of tubular column

Abstract

The invention relates to a bearing nipple device for tubular column orientation, and belongs to the technical field of petroleum underground equipment, the bearing nipple device comprises a transmission shaft and a spline housing, and the outer wall of the bottom end of the transmission shaft is provided with external threads; the spline sleeve sleeves the middle lower part of the transmission shaft, and the middle part of the spline sleeve is connected with the lower end of the transmission shaft through a shear pin; the top end of the transmission shaft is used for being in butt joint with a drill rod, and the bottom end of the spline housing is used for being in butt joint with a whipstock through a milling cone. An internal thread is arranged on the inner wall of the bottom end of the spline housing, and after the shear pin is sheared off, the transmission shaft can rotate and can move downwards till the external thread at the bottom end of the transmission shaft is connected with the internal thread at the bottom end of the spline housing through the thread. According to the bearing nipple device for pipe column orientation, forward rotation of a lower pipe column in advance can be effectively prevented in the pipe column orientation process, then friction resistance generated to a whipstock in the rotation process of a drill rod is small, drill jamming is avoided, and the oil extraction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum downhole equipment, in particular to a bearing short joint device for pipe string orientation. Background Art

[0002] As offshore oil and gas fields enter the mid-to-late stages of production, branch well technology has become a key tool in the oil industry to increase production and efficiency, boosting drainage areas and improving oil and gas field recovery. This technology involves drilling multiple branch wellbores within the main wellbore, enabling multi-target, three-dimensional production, and improving reservoir recovery and economic benefits.

[0003] During the running of the branch well string, the bottom end of the drill pipe directly docks with the milling cone, the milling cone docks with the whipstock, and the whipstock docks with the return tube. The drill pipe, milling cone, whipstock and return tube are rigidly docked in sequence from top to bottom to form a hard connection, which results in large friction and reduces oil production efficiency. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a bearing short section device for pipe string orientation, which is used to solve the problem that the current drill pipe, milling cone, whipstock and return tube are rigidly connected in sequence from top to bottom to form a hard connection, resulting in large friction and reduced oil production efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a bearing short section device for pipe string orientation, comprising A transmission shaft, the outer wall of which bottom end is provided with an external thread; a spline sleeve, sleeved on the middle and lower part of the transmission shaft, and the middle part of the spline sleeve and the lower end of the transmission shaft are connected by a shear pin; The top end of the transmission shaft is used to connect with the drill pipe, and the bottom end of the spline sleeve is used to connect with the whipstock through the milling cone. The inner wall of the bottom end of the spline sleeve is provided with an internal thread. When the shear pin is cut off, the transmission shaft can rotate and move downward until the external thread at the bottom end of the transmission shaft is threadedly connected with the internal thread at the bottom end of the spline sleeve.

[0006] Furthermore, a buffer mechanism is included, and the buffer mechanism includes a return spring, and the return spring is sleeved on the outer wall of the transmission shaft.

[0007] Preferably, the transmission shaft is provided with a second diameter-reducing step and a third diameter-reducing step, and the buffer mechanism is provided in an annular space between the transmission shaft and the spline sleeve between the second diameter-reducing step and the third diameter-reducing step; The buffer mechanism also includes an upper thrust bearing and a lower thrust bearing, The upper thrust bearing and the lower thrust bearing respectively abut against the second reduced diameter step and the third reduced diameter step; The return spring is sleeved on the outer wall of the transmission shaft between the upper thrust bearing and the lower thrust bearing.

[0008] Preferably, the buffer mechanism further includes an upper elastic gasket and a lower elastic gasket, The upper elastic washer is arranged between the upper thrust bearing and the top end of the return spring; The lower elastic washers are respectively arranged between the lower thrust bearing and the bottom end of the return spring.

[0009] Preferably, the transmission shaft is further provided with a first diameter-reducing step, and the first diameter-reducing step, the second diameter-reducing step and the third diameter-reducing step are sequentially provided on the transmission shaft from top to bottom, thereby dividing the transmission shaft into a drill rod docking section, a transition section, a buffer mechanism section and a spline sleeve docking section. The transmission shaft between the top end of the transmission shaft and the first reduced diameter step constitutes a drill rod docking section, and the inner wall of the transmission shaft of the drill rod docking section is provided with a thread for connecting with the drill rod; The transmission shaft between the first diameter-reducing step and the second diameter-reducing step forms a transition section; The transmission shaft between the second diameter-reducing step and the third diameter-reducing step constitutes a buffer mechanism section; The transmission shaft between the third reduced diameter step and the bottom end of the transmission shaft forms a spline sleeve docking section, and the outer wall of the transmission shaft of the spline sleeve docking section is provided with an external thread for docking with the internal thread of the spline sleeve.

[0010] Preferably, the spline sleeve is provided with a pin hole for setting a shear pin, and the pin hole is a countersunk pin hole. The pin hole passes through the spline sleeve and reaches the interior of the transmission shaft, and the thread of the pin hole extends from the spline sleeve to the interior of the transmission shaft.

[0011] Preferably, the inner wall of the upper end of the spline sleeve is matched with the outer wall of the upper middle portion of the transmission shaft, and a sealing ring is provided between the upper end of the spline sleeve and the transmission shaft.

[0012] Preferably, the bottom end of the transmission shaft is configured as a truncated cone with a larger upper end and a smaller lower end, so as to facilitate docking between the bottom end of the guiding transmission shaft and the top end of the spline sleeve.

[0013] Preferably, in order to facilitate the docking of the bottom end of the spline sleeve with the milling cone, the bottom end of the spline sleeve is configured as a truncated cone-shaped side surface that is larger at the top and smaller at the bottom.

[0014] Preferably, a drill rod, a milling cone, a bevel and a return tube are also provided. The drill rod is docked with the top end of the transmission shaft; the bottom end of the spline sleeve is docked with the upper part of the milling cone, the lower part of the milling cone is docked with the upper part of the bevel, and the lower part of the bevel is used to dock with the return tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention relates to a bearing short section device for pipe column orientation, comprising a transmission shaft and a spline sleeve, wherein the outer wall of the bottom end of the transmission shaft is provided with an external thread; the spline sleeve is sleeved on the middle and lower part of the transmission shaft, and the middle part of the spline sleeve is connected to the lower end of the transmission shaft by a shear pin; wherein the top end of the transmission shaft is used for docking with the drill pipe, and the bottom end of the spline sleeve is used for docking with the bevel through a milling cone; the inner wall of the bottom end of the spline sleeve is provided with an internal thread, and when the shear pin is sheared off, the transmission shaft can rotate and can also move downward until the external thread at the bottom end of the transmission shaft and the internal thread at the bottom end of the spline sleeve are threadedly connected together. Since the drill pipe is docked with the transmission shaft, the spline sleeve is docked with the bevel through the milling cone, and the transmission shaft and the spline sleeve are movably sleeved, the bevel milling cone connected to the spline sleeve is in a free state before the shear pin is sheared off, thereby preventing the bevel and the return tube located at the lower part of the pipe column from rotating forward in advance, thereby reducing the friction resistance of the pipe column. The invention discloses a bearing short section device for pipe string orientation, which can effectively prevent the lower pipe string from rotating forward prematurely during the pipe string orientation process, thereby reducing the friction resistance on the whipstock during the rotation of the drill pipe, avoiding drill sticking, and improving oil production efficiency.

[0016] (2) Different from the direct rigid connection between the drill pipe and the milling cone currently used, the bearing short section device for pipe column orientation disclosed by the present invention adds a transmission shaft and a spline sleeve between the drill pipe and the milling cone, and when the shear pin is cut off, the transmission shaft can rotate and move downward until the external thread at the bottom end of the transmission shaft and the internal thread at the bottom end of the spline sleeve are threadedly connected together, so that the milling cone of the bevel device connected by the spline sleeve is in a free state before the shear pin is cut off. The bearing short section device for pipe column orientation disclosed by the present invention effectively avoids the lower pipe column from rotating forward in advance. If the pipe column encounters resistance during the lowering process, the drill pipe can be rotated forward to realize the rotational lowering of the lower pipe column. After the bevel device is lowered to the predetermined position, the bevel device can be rotated and adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of a bearing sub device for orienting a pipe string provided in Example 1 of the present invention; Figure 2 Schematic diagram of the external structure of the transmission shaft provided in Example 1 of the present invention; Figure 3 This is a longitudinal half-section structural diagram of a bearing sub device for orienting a pipe string provided in Example 1 of the present invention; Figure 4 yes Figure 3 A partial enlarged view of the buffer mechanism.

[0018] Description of reference numerals: 1- transmission shaft, 10- external thread, 11- drill pipe docking section, 12- transition section, 13- buffer mechanism section, 14- spline sleeve docking section, A1- first diameter reduction step, A2- second diameter reduction step, A3- third diameter reduction step; 2-spline sleeve, 20-internal thread, 21-truncated cone side; 3-shear pin, 30-pin hole; 4-buffer mechanism, 40-return spring, 41-upper thrust bearing, 42-lower thrust bearing, 43-upper elastic gasket, 44-lower elastic gasket; 5-Sealing ring. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0020] In order to solve the problem that the current drill pipe, milling cone, bevel and return pipe are rigidly connected in sequence from top to bottom to form a hard connection, which has large friction and reduces oil production efficiency, the bearing short section device for pipe column orientation disclosed in the present invention is different from the direct rigid connection between the drill pipe and the milling cone currently used. A transmission shaft and a spline sleeve are added between the drill pipe and the milling cone. When the shear pin is sheared off, the transmission shaft can rotate and move downward until the external thread at the bottom end of the transmission shaft and the internal thread at the bottom end of the spline sleeve are threadedly connected together, so that the bevel milling cone connected by the spline sleeve is in a free state before the shear pin is sheared off. The bearing short section device for pipe column orientation disclosed in the present invention effectively avoids the lower pipe column from rotating forward in advance. If the pipe column encounters resistance during lowering, the drill pipe can be rotated forward to realize the rotational lowering of the lower pipe column. After the bevel is lowered to the predetermined position, the bevel can be rotated and adjusted.

[0021] Example 1: A bearing sub device for pipe string orientation Embodiment 1 of the present invention provides a bearing subassembly for pipe string orientation, and its structure is described in detail below with reference to the accompanying drawings.

[0022] refer to Figure 1 The pipe string orientation bearing short section device includes a transmission shaft 1 and a spline sleeve 2. The outer wall of the bottom end of the transmission shaft 1 is provided with an external thread 10. The spline sleeve 2 is sleeved on the middle and lower part of the transmission shaft 1, and the middle part of the spline sleeve 2 is connected to the lower end of the transmission shaft 1 through a shear pin 3; The top end of the transmission shaft 1 is used to connect with the drill pipe, and the bottom end of the spline sleeve 2 is used to connect with the whipstock through the milling cone. The inner wall of the bottom end of the spline sleeve 2 is provided with an internal thread 20. When the shear pin 3 is sheared off, the transmission shaft 1 can rotate and move downward until the external thread 10 at the bottom end of the transmission shaft 1 is threadedly connected with the internal thread 20 at the bottom end of the spline sleeve 2.

[0023] To ensure the stability of the downward movement of the transmission shaft 1 after the shear pin 3 is sheared, the pipe string orienting bearing nipple device further includes a buffer mechanism 4, which includes a return spring 40. The return spring 40 is sleeved on the outer wall of the transmission shaft 1. Specifically, the return spring 40 is a cylindrical compression return spring 40 with both ends flattened and tightened. In its natural state, the return spring 40 is used to support the transmission shaft 1 and prevent the shear pin 3 from being subjected to premature force.

[0024] As a specific embodiment, a second reduced diameter step A2 and a third reduced diameter step A3 are provided on the transmission shaft 1, and the buffer mechanism 4 is provided in the annular space between the transmission shaft 1 and the spline sleeve 2 between the second reduced diameter step A2 and the third reduced diameter step A3.

[0025] In order to reduce the friction resistance of the transmission shaft 1 during rotation, the buffer mechanism 4 further includes an upper thrust bearing 41 and a lower thrust bearing 42, wherein the upper thrust bearing 41 and the lower thrust bearing 42 respectively abut against the second reduced diameter step A2 and the third reduced diameter step A3; The return spring 40 is sleeved on the outer wall of the transmission shaft 1 between the upper thrust bearing 41 and the lower thrust bearing 42 .

[0026] The buffer mechanism 4 further includes an upper elastic gasket 43 and a lower elastic gasket 44 . The upper elastic gasket 43 is arranged between the upper thrust bearing 41 and the top end of the return spring 40 ; the lower elastic gasket 44 is respectively arranged between the lower thrust bearing 42 and the bottom end of the return spring 40 .

[0027] Furthermore, the transmission shaft 1 is further provided with a first diameter-reducing step A1. The first diameter-reducing step A1, the second diameter-reducing step A2 and the third diameter-reducing step A3 are sequentially provided on the transmission shaft 1 from top to bottom, thereby dividing the transmission shaft 1 into a drill pipe docking section 11, a transition section 12, a buffer mechanism section 13 and a spline sleeve docking section 14. The transmission shaft 1 between the top end of the transmission shaft 1 and the first reduced diameter step A1 constitutes a drill rod docking section 11, and the inner wall of the transmission shaft 1 of the drill rod docking section 11 is provided with a thread for connecting with the drill rod; The transmission shaft 1 formed between the first diameter-reducing step A1 and the second diameter-reducing step A2 forms a transition section 12; The transmission shaft 1 between the second reduced diameter step A2 and the third reduced diameter step A3 constitutes a buffer mechanism section 13; The transmission shaft 1 between the third reduced diameter step A3 and the bottom end of the transmission shaft 1 forms a spline sleeve docking section 14 , and the outer wall of the transmission shaft 1 of the spline sleeve docking section 14 is provided with an external thread 10 for docking with the internal thread 20 of the spline sleeve 2 .

[0028] As a specific embodiment, the spline sleeve 2 is provided with a pin hole 30 for receiving a shear pin 3. The pin hole 30 is a countersunk pin hole for receiving the shear pin 3. The pin hole 30 extends through the spline sleeve 2 and into the interior of the drive shaft 1, and the thread of the pin hole 30 extends from the spline sleeve 2 into the interior of the drive shaft 1. The shear pin 3 is installed in the countersunk pin hole of the spline sleeve 2 to prevent the spline sleeve 2 from rotating forward during tool face adjustment.

[0029] The inner wall of the upper end of the spline sleeve 2 is adapted to the outer wall of the upper middle portion of the transmission shaft 1. To ensure sealing, a sealing ring 5 is provided between the upper end of the spline sleeve 2 and the transmission shaft 1. The sealing ring 5 can prevent annular space liquid from entering the interior of the tool.

[0030] In order to facilitate the docking between the bottom end of the guide transmission shaft 1 and the top end of the spline sleeve 2, the bottom end of the transmission shaft 1 is configured to be a truncated cone with a larger upper end and a smaller lower end.

[0031] In order to facilitate the docking of the bottom end of the spline sleeve 2 with the milling cone, the bottom end of the spline sleeve 2 is configured as a truncated cone-shaped side surface 21 that is larger at the top and smaller at the bottom.

[0032] Furthermore, in order to better implement the pipe string orientation bearing short section device, the pipe string orientation bearing short section device is also equipped with a drill pipe, a milling cone, a whipstock and a tie-back tube. The drill rod is butted against the top end of the transmission shaft 1; The bottom end of the spline sleeve 2 is docked with the upper part of the milling cone, the lower part of the milling cone is docked with the upper part of the whipstock, and the lower part of the whipstock is used to dock with the return cylinder.

[0033] Among them, the whipstock is connected to the return tube, and the return tube is docked with the anchor.

[0034] Example 2: Method for using a bearing sub for pipe string orientation Embodiment 2 of the present invention provides a method for using a bearing sub device for pipe string orientation, using the bearing sub device for pipe string orientation of embodiment 1. The method includes the following steps: First trip: Use the inner string to anchor the ground anchor in place, then pull the inner string out; The second trip: the drill rod is docked with the top end of the transmission shaft 1; the bottom end of the spline sleeve 2 is docked with the upper part of the milling cone, and the lower part of the milling cone is docked with the upper part of the whipstock. At this time, the whipstock and the milling cone are in a free state, which can effectively prevent the whipstock from rotating forward prematurely.

[0035] If resistance is encountered during the lowering of the pipe string, the transmission shaft 1 is pressed down, and the transmission shaft 1 compresses the return spring 40 inside the spline sleeve 2 until the shear pin 3 is completely sheared off. The bottom end of the transmission shaft 1 is docked with the top end of the spline sleeve 2, and the external thread 10 at the bottom end of the transmission shaft 1 extends into the internal thread 20 at the top end of the spline sleeve 2, and the two are threadedly connected; the drill pipe is rotated forward, and the drill pipe driving torque can be transmitted to the whipstock, so that the entire pipe string rotation is unblocked.

[0036] If there is no resistance during the running of the entire string, wait until the whipstock is run to the predetermined position and then press the drill pipe downward. The drive shaft 1 compresses the return spring 40 and the shear pin 3 inside the spline sleeve 2. The external thread 10 at the bottom of the drive shaft 1 extends into the internal thread 20 at the top of the spline sleeve 2. The drill pipe is rotated forward. After the drive shaft 1 and the spline sleeve 2 are threaded together, the top drive torque can be transmitted to the tie-back barrel and the anchor. The third pass: adjust the direction of the bevel, insert the tie-back barrel into the first pass tool, press down the pipe string to shear the pin connecting the milling cone and the whipstock, and the milling cone will be separated from the whipstock to start the window opening operation.

[0037] In summary, since the bevel milling cone connected by the spline sleeve is in a free state before the shear pin is cut off, the bevel and the return barrel at the lower part of the pipe string are prevented from rotating forward in advance. When the tool string encounters resistance, the tool string needs to be rotated and lowered into place. After the bevel is lowered into the predetermined position, the tool face needs to be adjusted, the milling cone is separated from the bevel, and the window opening operation begins.

[0038] In the bearing subassembly for pipe string orientation disclosed herein, the whipstock, milling cone, and drill pipe connected below the spline sleeve 2 are not rigidly connected. Instead, the whipstock and milling cone are free, effectively preventing premature forward rotation of the lower pipe string. If the pipe string encounters resistance during lowering, the drill pipe can be rotated forward to allow the lower pipe string to be lowered. After the whipstock is lowered to the desired position, the whipstock can be rotated and adjusted. The bearing subassembly for pipe string orientation disclosed herein has a simple structure, stable and reliable functionality, is convenient and practical, and is low-cost.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bearing short section device for pipe string orientation, characterized in that: include A transmission shaft (1), the outer wall of the bottom end of which is provided with an external thread (10); a spline sleeve (2) sleeved on the middle and lower part of the transmission shaft (1), and the middle part of the spline sleeve (2) and the lower end of the transmission shaft (1) are connected via a shear pin (3); The top end of the transmission shaft (1) is used for docking with a drill rod, and the bottom end of the spline sleeve (2) is used for docking with a whipstock through a milling cone; The inner wall of the bottom end of the spline sleeve (2) is provided with an internal thread (20). When the shear pin (3) is sheared off, the transmission shaft (1) can rotate and move downward until the external thread (10) at the bottom end of the transmission shaft (1) and the internal thread (20) at the bottom end of the spline sleeve (2) are threadedly connected together.

2. The bearing sub device for pipe string orientation according to claim 1, characterized in that: It also includes a buffer mechanism (4), the buffer mechanism (4) including a return spring (40), and the return spring (40) is sleeved on the outer wall of the transmission shaft (1).

3. The bearing sub device for pipe string orientation according to claim 1, characterized in that: The transmission shaft (1) is provided with a second reduced diameter step (A2) and a third reduced diameter step (A3), and the buffer mechanism (4) is provided in an annular space between the transmission shaft (1) and the spline sleeve (2) between the second reduced diameter step (A2) and the third reduced diameter step (A3); The buffer mechanism (4) further includes an upper thrust bearing (41) and a lower thrust bearing (42). The upper thrust bearing (41) and the lower thrust bearing (42) respectively abut against the second reduced diameter step (A2) and the third reduced diameter step (A3); The return spring (40) is sleeved on the outer wall of the transmission shaft (1) between the upper thrust bearing (41) and the lower thrust bearing (42).

4. The bearing sub device for pipe string orientation according to claim 3, characterized in that: The buffer mechanism (4) further includes an upper elastic gasket (43) and a lower elastic gasket (44). The upper elastic gasket (43) is arranged between the upper thrust bearing (41) and the top end of the return spring (40); The lower elastic gasket (44) is respectively arranged between the lower thrust bearing (42) and the bottom end of the return spring (40).

5. The bearing sub device for pipe string orientation according to claim 4, characterized in that: The transmission shaft (1) is further provided with a first diameter reduction step (A1), wherein the first diameter reduction step (A1), the second diameter reduction step (A2) and the third diameter reduction step (A3) are sequentially provided on the transmission shaft (1) from top to bottom, thereby dividing the transmission shaft (1) into a drill rod docking section (11), a transition section (12), a buffer mechanism section (13) and a spline sleeve docking section (14). The transmission shaft (1) between the top end of the transmission shaft (1) and the first reduced diameter step (A1) constitutes a drill rod docking section (11), and the inner wall of the transmission shaft (1) of the drill rod docking section (11) is provided with a thread for docking with the drill rod; The transmission shaft (1) of the first diameter-reducing step (A1) and the second diameter-reducing step (A2) forms a transition section (12); The transmission shaft (1) between the second reduced diameter step (A2) and the third reduced diameter step (A3) constitutes a buffer mechanism section (13); The transmission shaft (1) between the third reduced diameter step (A3) and the bottom end of the transmission shaft (1) forms a spline sleeve docking section (14), and the outer wall of the transmission shaft (1) of the spline sleeve docking section (14) is provided with an external thread (10) for docking with the internal thread (20) of the spline sleeve (2).

6. The bearing sub device for pipe string orientation according to claim 1, characterized in that: The spline sleeve (2) is provided with a pin hole (30) for arranging a shear pin (3), the pin hole (30) being a countersunk pin hole, the pin hole (30) penetrating the spline sleeve (2) and reaching the interior of the transmission shaft (1), and the thread of the pin hole (30) extending from the spline sleeve (2) to the interior of the transmission shaft (1).

7. The bearing sub device for pipe string orientation according to claim 1, characterized in that: The inner wall of the upper end of the spline sleeve (2) is matched with the outer wall of the upper middle portion of the transmission shaft (1), and a sealing ring (5) is provided between the upper end of the spline sleeve (2) and the transmission shaft (1).

8. The bearing sub device for pipe string orientation according to claim 1, characterized in that: The bottom end of the transmission shaft (1) is configured as a truncated cone with a larger upper end and a smaller lower end, so as to facilitate docking of the bottom end of the transmission shaft (1) and the top end of the spline sleeve (2).

9. The bearing sub device for pipe string orientation according to claim 1, characterized in that: In order to facilitate the docking of the bottom end of the spline sleeve (2) with the milling cone, the bottom end of the spline sleeve (2) is configured as a truncated cone-shaped side surface (21) that is larger at the top and smaller at the bottom.

10. The bearing sub device for pipe string orientation according to claim 1, characterized in that: It is also equipped with drill pipe, milling cone, whipstock and tie-back tube. The drill rod is butted against the top end of the transmission shaft (1); The bottom end of the spline sleeve (2) is butted against the upper part of the milling cone, the lower part of the milling cone is butted against the upper part of the whipstock, and the lower part of the whipstock is used to butt against the tie-back cylinder.

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