CN217380468U - Hydraulic unlocking releasing device for open hole whipstock sidetracking - Google Patents
Hydraulic unlocking releasing device for open hole whipstock sidetracking Download PDFInfo
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- CN217380468U CN217380468U CN202121180185.0U CN202121180185U CN217380468U CN 217380468 U CN217380468 U CN 217380468U CN 202121180185 U CN202121180185 U CN 202121180185U CN 217380468 U CN217380468 U CN 217380468U
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Abstract
The utility model relates to an oil drilling downhole tool technical field, in particular to bore hole slant sidetracking hydraulic pressure unblock release device, including top connection, center tube, last piston, elasticity claw piston, cylinder, integral key shaft, sealing joint, spline joint head, screw gland, lower clutch. The upper connector is connected with the upper tool string through the central pipe, and the lower connector is connected with the lower tool string through the lower connector. The inner side and the outer side of the internal spline shaft are both provided with splines which are meshed with the cylinder barrel and the center rod, so that the internal spline shaft can bear the torque from the upper pipe column. After the open hole sidetracking tool string is put into a shaft, spline unlocking is achieved through hydraulic pressure, and then releasing action is achieved through a forward rotation and reverse buckling mode. Compared with the traditional back-off releasing structure, the safety is higher.
Description
Technical Field
The utility model relates to an oil drilling downhole tool technical field, in particular to bore hole whipstock sidetracking hydraulic pressure unblock releasing device.
Background
In the drilling construction, due to process requirements or treatment of complex conditions in a well, open hole sidetracking operation is often required to be carried out in the deep part of a well hole, and the conventional method is to carry out cement plug sidetracking. When the open hole side drilling position is in a large-inclination, small-bore, deep well, high-temperature and/or high-pressure well section or a reducing well section is arranged at the upper part of the side drilling position, the cement side drilling cannot achieve the effect of a shallow well. Particularly in deep hard formation well sections, the strength of the cement plug is generally not higher than that of the surrounding formation rocks, so that the cement plug is difficult to serve as a 'sidetrack platform', and sidetrack is very difficult. By putting a whipstock into the naked eye and fixing the whipstock on the well wall and relying on a steel inclined plane to perform sidetracking, the success rate of one-time sidetracking is greatly improved.
The existing common open hole whipstock is characterized in that an inclined plane and an anchor are connected through a feeding rod into a borehole, the anchor is fixed to stratum rock, and then the feeding rod is pulled out through a forward rotation drilling tool and is played to the ground. The basic principle is that the reverse buckle is processed below the feeding rod, and the reverse buckle is realized by forward rotation of the feeding rod. Patents "CN 201120415989.4" and "CN 201220664891.7" disclose the back-off thread releasing mechanism, which can bear large axial tension, but has the disadvantage that the tool cannot rotate forward and cannot bear torque after entering the well. Therefore, the sleeve is more suitable for being used in a sleeve and is not suitable for open hole operation.
"CN201220567229. X" discloses a mechanical-hydraulic double-acting releasing mechanism, which can reduce the construction risk of releasing failure by releasing in two modes of hydraulic and mechanical, but the releasing mode also realizes the unlocking of an elastic claw and an external locking pipe firstly by shearing a pin between a lock head and the elastic claw by hydraulic pressure, and then realizes releasing by forward rotation and reverse rotation, and the defect that the elastic claw cannot bear larger torque is not solved.
"CN 201310246044.8" discloses a hydraulic starting back-off releasing mechanism, which overcomes the defect that the ground can not rotate the pipe column in the positive direction in the well-entering process of the tool and before the completion of the operation of the conventional left-handed thread back-off releasing mechanism, and also overcomes the defect that the existing mechanical and hydraulic double-acting releasing tool has the disadvantage that the shear pin is accidentally cut off. However, in the patent, the upper piston is connected with the shell through the pin, when the pressure consumption is large, the pin of the upper piston is easily cut off in advance, so that the hydraulic unlocking fails, the spline cannot be untied, the mechanical back-off action cannot be realized, and the great risk of releasing the hand is existed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a bore hole whipstock sidetracking hydraulic pressure unblock releasing device to not enough among the prior art, be applicable to bore hole whipstock sidetracking and use.
The technical scheme is as follows:
a hydraulic unlocking releasing device for open hole whipstock sidetracking comprises an upper joint, a central pipe, an upper piston, an elastic claw piston, a cylinder barrel, a spline shaft, a sealing joint, a rotation stopping key head, a thread gland, a lower joint and a shearing pin;
the upper joint, the cylinder barrel, the sealing joint and the lower joint are sequentially connected to form an outer cylinder string;
the central tube is arranged in the outer tube string, and two ends of the central tube are respectively connected with the upper joint and the rotation stopping key head through threads;
the rotation stopping key head is inserted into the sealing joint through a spline, and the lower part of the rotation stopping key head is pressed tightly through a threaded gland; the screw gland is in threaded connection with the sealing joint and is arranged in an inner cavity formed by the sealing joint and the lower joint;
the upper piston, the elastic claw piston and the spline shaft are sequentially sleeved on the central pipe from top to bottom;
the spline shaft is respectively matched with the cylinder barrel and the central pipe spline, and the lower part of the spline shaft is connected with the cylinder barrel through a shearing pin;
the inner end face of the lower part of the elastic claw piston is freely pressed with the upper end face of the spline shaft.
Furthermore, an elastic claw release cavity is arranged inside the cylinder barrel, and the outer dimension of an elastic claw at the lower part of the elastic claw piston is larger than the inner diameter of the cylinder barrel and smaller than the inner diameter of the elastic claw release cavity.
Furthermore, the inner side and the outer side of the upper piston are respectively provided with a sealing O ring and a first sealing element, and the end faces of the two sides are limited by the inner end face of the upper joint and a step on the inner cavity of the cylinder barrel.
Furthermore, the upper portion of the central pipe is provided with a pressure transfer hole, the pressure transfer hole is a radial through hole, the upper piston, the elastic claw piston and the cylinder barrel form a cavity, and the cavity is communicated with the inner hole of the central pipe through the pressure transfer hole.
Further, the middle part of the cylinder body is provided with a spline shaft downward-moving liquid discharge breathing hole and an elastic claw piston downward-moving liquid discharge breathing hole, and the spline shaft downward-moving liquid discharge breathing hole and the elastic claw piston downward-moving liquid discharge breathing hole are radial through holes.
Furthermore, the outer side of the spline shaft is provided with an external spline which is matched with a cylinder barrel spline, and the inner side of the spline shaft is provided with an internal spline which is matched with a central pipe spline.
Furthermore, the length of the external spline of the spline shaft is greater than that of the internal spline, and when the lower end face of the spline shaft is attached to the upper end face of the sealing joint after the shearing pin is sheared, the spline shaft is still meshed with the cylinder barrel through the spline, and the spline shaft is disengaged from the spline of the central pipe.
Furthermore, the lower part of the spline shaft is provided with an annular groove, and the annular groove is matched with a pin hole processed by the cylinder barrel body to jointly accommodate the shearing pin.
Furthermore, 4 rectangular splines are machined on the rotation stop key head and are inserted into corresponding spline grooves of the sealing joint.
Further, the elastic claw piston presses the second sealing element on the inner side and the outer side.
The utility model has the advantages that:
the torque of the open hole sidetracking tool string is transmitted by the meshing spline among the central tube, the spline shaft and the cylinder barrel, so that the torque can bear a larger torque value. The limit that the conventional back-off releasing mechanism cannot rotate the pipe column forward after the tool enters the shaft is overcome, and the application range is wider. The weight of the lower string is transmitted through the threads to the base pipe and can also bear a greater weight. Therefore, after the open hole side drilling tool string is lowered into the shaft and is blocked, the problem can be solved through forward rotation and up-and-down movement, and the use safety of the tool is higher.
Fluid exhaling holes are formed in the cylinder barrel descending the elastic claw piston and the spline shaft, and when the elastic claw piston and the spline shaft move downwards under the action of hydraulic pressure, liquid in an inner cavity of the cylinder barrel can be discharged in time.
Through the screw-thread fit and the rotation prevention of the rotation stopping key head, the screw gland and the central pipe, the assembly is more convenient as the central pipe is directly connected with the outer shell through screw threads.
Drawings
Fig. 1 is the utility model discloses an bore hole whipstock sidetracking hydraulic pressure unblock release device cooperates the whole sketch of bore hole sidetracking instrument cluster that uses.
Fig. 2 is the utility model discloses an bore hole whipstock sidetracking hydraulic pressure unblock releasing device schematic diagram.
Fig. 3 is the spline fit schematic diagram of the spline shaft, the center tube and the outer tube of the barefoot whipstock sidetracking hydraulic unlocking releasing device of the utility model.
Fig. 4 is the utility model discloses a bore hole whipstock sidetracking hydraulic pressure unblock release device's center tube spline fit sketch map of splining.
In the figure:
1. the device comprises a feeding rod, 2, an inverted inclined body, 3, a stratum, 4, a releasing device, 5 an anchor, 6, a slip tooth, 7, an anti-rotation processing drill rod, 8, a cement diversion hole, 9, an anti-rotation cross rod, 10, an upper joint, 11, a central pipe, 12, a sealing O ring, 13, a first sealing element, 14, an upper piston, 15, a second sealing element, 16, an elastic claw piston, 17, a cylinder barrel, 18, a spline shaft, 19, a sealing element, 20, a sealing joint, 21, an anti-rotation key head, 22, a thread gland, 23, a lower joint, 24, a shearing pin, 25, a spline shaft downward movement liquid drainage breathing hole, 26, an elastic claw piston downward movement liquid drainage breathing hole, 27, a pressure cavity, 28, a spline shaft groove, 29, a pressure transmission hole, 30 and an elastic claw release cavity.
Detailed Description
The present invention will be described in further detail with reference to the accompanying fig. 1-4 and the detailed description.
The first embodiment is as follows:
a hydraulic unlocking releasing device for open hole whipstock sidetracking comprises an upper joint 10, a central pipe 11, an upper piston 14, an elastic claw piston, a cylinder barrel 17, a spline shaft, a sealing joint 20, a rotation stopping key head 21, a threaded gland 22 and a lower joint 23. The upper joint 10, the cylinder 17, the sealing joint 20 and the lower joint 23 are connected in sequence through threads to form an outer cylinder string. The upper joint 10 is connected with the inverted chamfer 2 through threads, and the lower joint 23 is connected with the open hole anchor 5 through threads.
The central tube 11 is arranged in the center of the inner part of the outer cylinder string, the lower part of the central tube is connected with the rotation stopping key head 21 through a left-hand thread, and the upper part of the central tube is connected with the feeding rod 1 through a right-hand thread. The spline head 21 is inserted into the spline groove of the seal sub 20 via 4 rectangular splines, receives the torque force of the upper drill string, and the lower part is pressed by the screw gland 22. The screw gland 22 is connected to the sealing joint 20 by screw threads, and is disposed in the inner cavity formed by the sealing joint 20 and the lower joint 23, and mainly used for bearing the downward pressure from the central pipe 11.
The torque transmission between the central tube 11 and the outer cylinder string is by the engagement of the splined internal and external splines with the splines between the central tube 11 and the cylinder 17. For convenient installation and positioning, the number of the internal spline shaft and the external spline shaft is generally the same, but the number of the internal spline shaft and the external spline shaft can also be different. The lower part of the spline shaft is recessed and suspended to the cylinder 17 by a number of shear pins 24. The cylinder 17 is provided with 8-12 pin holes, and the number of the pins is determined by calculation of the actual required hydraulic pressure.
The elastic claw piston is arranged between the cylinder 17 and the central tube 11, the sealing element 191513 is pressed on the inner side and the outer side, and the inner end face of the lower part of the elastic claw piston is freely pressed with the upper end face of the spline shaft. The upper piston 14 is arranged between the cylinder 17 and the central tube 11 and presses the sealing element 191513 on the inner side and the outer side, and the end surfaces on both sides are limited by the lower end surface in the upper connector 10 and the inner cavity step of the cylinder 17. The upper piston 14 and the elastic claw piston form a sealed chamber with the cylinder 17 and the central tube 11 and are connected into the central tube 11 through a pressure transmitting hole 29.
Example two:
the utility model provides an open hole whipstock sidetracking hydraulic pressure unblock releasing device, upper portion and the inverted-inclined body 2 with send into pole 1 and pass through threaded connection, the lower part passes through the screw and is connected with anchor 5, anti-rotation pipe.
The anchor 5 has a shearable plug therein and the shear pressure is greater than the pin shear pressure in the releasing device 4.
And after the open hole sidetracking tool string is lowered to the designed well depth, pumping drilling fluid through a wellhead to realize the pressure building in the central pipe 11. The pressure in the central tube 11 acts on the upper end surface of the elastic claw piston through the pressure transfer hole 29 to push the elastic claw piston to extrude the spline shaft to move downwards, when the designed pressure value is reached, the shear pin 24 is pressed off, the spline engagement of the central tube 11 and the spline shaft is separated, and the central tube 11 can rotate forwards to release the hand.
The lower end of the elastic claw piston is a petal-type elastic claw, and the outer diameter of the claw tip is larger than the inner diameter of the cylinder 17 and smaller than the inner diameter of the elastic claw release cavity 30. The elastic claw piston moves downwards to the position of the elastic claw release cavity 30, and the petal-type elastic claws are opened.
Continuing to increase the pressure in the central tube 11, the anchor 5 is activated to firmly insert the slip elements 6 into the rock in the formation 3 and prevent rotation of the inverted cone 2. When the pressure in the central tube 11 reaches the shearing pressure of the shearing plug, the plug is opened, and the pressure in the tube is released. At this time, the bounce force caused by the pressure instant release may cause the spline shaft to bounce, which causes the central pipe 11 and the spline shaft to be re-engaged after separation, so that the central pipe cannot rotate forwards or backwards, and the releasing fails. The flap-type elastic claw at the lower end of the elastic claw piston can prevent the situation from happening.
The spline length of the spline shaft engaged with the cylinder 17 is longer than the spline length of the spline shaft engaged with the center tube 11. After the splined shaft is moved down to the position, the spline engagement with the central tube 11 is completely disengaged and the spline engagement with the cylinder 17 remains partially engaged. The spline shaft does not rotate when the center tube 11 is rotated by back-threading.
Example three:
the utility model discloses an bore hole sidetracking instrument cluster overall structure that bore hole whipstock hydraulic pressure unblock release device used cooperatees refers to attached figure 1.
The releasing device 4 is arranged between the inclined guide body 2 and the anchor device 5 after being assembled, at the upper end of the releasing device 4, a central pipe 11 is in threaded connection with the feeding rod 1 through a right-hand thread, the upper end of the feeding rod 1 is connected with a related operation pipe column including a drill rod, and an upper joint 10 of the releasing device is connected with the inclined guide body 2 through a thread. A through hole is formed in the oblique guide 2 to allow the feed rod 1 to pass through freely. The lower sub 23 of the release mechanism is threadedly connected to the anchor 5. The middle of the anchor 5 is provided with 3 or 4 clamping tile teeth 6, and the lower end of the anchor is connected with an anti-rotation processing drill rod 7 through threads.
Referring to fig. 2, the construction process and the main function of the open hole sidetracking tool string of the utility model are further described.
The utility model discloses an bore hole sidetracking hydraulic pressure unblock releasing mechanism: the device comprises an upper joint 10, a central pipe 11, an upper piston 14, an elastic claw piston 16, a cylinder 17, a spline shaft 18, a sealing joint 20, a rotation stop key head 21, a screw gland 22 and a lower joint 23.
The upper joint 1, the cylinder 17, the sealing joint 20 and the lower joint 23 are connected in sequence through threads to form an outer cylinder string.
The central tube 11 is arranged in the center of the inner part of the outer cylinder string, and the lower part of the central tube is connected with the rotation stopping key head 21 through the back-off thread. The lower part of the central tube 11 is fitted with a sealing joint 20 by means of a sealing element 19.
Referring to fig. 4, the spline head 21 is in spline fit with the seal sub 20, and 4 rectangular splines are formed on the spline head 21 and inserted into corresponding spline grooves of the seal sub 20. The spline fit is primarily to withstand the torque forces of the central tube 11 from the forward release.
The lower part of the central tube 11 is pressed by a screw gland 22. The screw gland 22 is connected to the sealing joint 20 by screw threads and is disposed in the inner cavity formed by the sealing joint 20 and the lower joint 23, and the screw gland 22 mainly functions to bear the axial tension from the central pipe 11 and the upper pipe string.
Referring to fig. 3, the center tube 11 and the spline shaft 18 are spline-fitted, and the cylinder 17 and the spline shaft 18 are spline-fitted. For convenient installation and positioning, the spline shafts 17 are generally provided with the same number of internal splines and external splines, but the number of the internal splines and the external splines can also be different.
The lower portion of the spline shaft 18 and the cylinder 17 are connected by a shear pin 24. The lower portion of the spline shaft 18 has an annular groove 28, and the annular groove 28 cooperates with a pin hole formed in the body of the cylinder 17 to receive the shear pin 24. The pin holes of the cylinder 17 are usually 8-12, but not all pin holes need to be provided with shear pins 24, and the number of the installation is determined by calculation of the actual hydraulic pressure required.
The elastic claw piston 16 is arranged between the cylinder 17 and the central tube 11, the second sealing element 15 is pressed on the inner side and the outer side, and the end face of the lower inner cavity of the elastic claw piston 16 is freely pressed with the upper end face of the spline shaft 18. The middle part of the cylinder 17 body is provided with a cavity elastic claw release cavity 30 with an enlarged inner diameter, the lower end of the elastic claw piston 16 is provided with a petal-type elastic claw, and the outer diameter of the claw tip is larger than the inner diameter of the cylinder 17 and smaller than the inner diameter of the elastic claw release cavity 30.
The upper piston 14 is arranged between the cylinder 17 and the central tube 11 and is pressed with the sealing O-ring 12 and the first sealing element 13 at the inner side and the outer side, and the end surfaces at both sides are limited by the lower end surface in the upper joint 10 and the inner cavity step of the cylinder 17. The upper part of the central tube 11 is provided with a radial through hole pressure transfer hole 29, and the upper piston 14 and the elastic claw piston 16 form a cavity 27 with the cylinder 17 and are communicated with the inner hole of the central tube 11 through the pressure transfer hole 29.
The middle part of the cylinder 17 body is provided with a radial through hole spline shaft downward-moving liquid-discharging breather hole 25 and an elastic claw piston downward-moving liquid-discharging breather hole 26.
Specifically, the construction process of the releasing device comprises the following steps:
referring to the attached drawing 1, the open hole sidetracking tool string is connected at the wellhead, and comprises a connecting central pipe 11, a feeding rod 1, a connecting lower joint 23, an anchor 5, a connecting anchor 5 and an anti-rotation processing drill rod 7.
And (4) putting the connected open hole sidetracking tool string into the well hole to the designed well depth through the drill rod.
And pumping drilling fluid through a wellhead to realize pressure building in the central pipe 11.
The pressure in the central tube 11 is acted on the upper end surface of the elastic claw piston 16 through the pressure transmitting hole 29, the elastic claw piston 16 is pushed to extrude the spline shaft 18 to move downwards, and the shearing pin 24 is broken when the designed pressure value is reached.
At this time, the pressure continues to be suppressed, the elastic claw piston 16 continues to descend, and pushes the spline shaft 18 to move to the upper end face of the sealing joint 20. When the elastic claw piston 16 and the spline shaft 18 descend, the fluid in the inner cavity of the cylinder 17 is discharged into the annular space of the cylinder through the spline shaft downward movement liquid discharge breathing hole 25 and the elastic claw piston downward movement liquid discharge breathing hole 26.
After the spline shaft 18 moves downwards to the right position, the spline of the central tube 11 and the spline shaft 18 are meshed and disengaged, the central tube 11 rotates forwards until the left-hand thread of the central tube 11 and the rotation stopping key head 21 is loosened, and releasing is achieved.
The releasing process is finished, and the feeding rod 1 is lifted out of the wellhead.
Additionally, the technical scheme of the utility model in:
there is a shear plug in the anchor 5 and the shear pressure of the shear plug is greater than the shear pressure of the shear pin 24 in the releasing device 4.
Continuing to increase the pressure in the base pipe 11, the anchor 5 is activated to push and bite the slip elements 6 laterally into the formation 3 rock, preventing rotation of the inverted body 2. When the pressure in the central tube 11 reaches the shearing pressure of the shearing plug in the anchor 5, the shearing plug is opened, and the pressure in the tube is released. At this time, the bounce force caused by the pressure instant release may cause the spline shaft 18 to bounce upwards, which causes the central pipe 11 and the spline shaft 18 to be re-engaged after being separated, so that the central pipe 11 cannot rotate forwards or backwards, and the releasing fails. This situation can be prevented by the flap-type elastic claw at the lower end of the elastic claw piston 16, the elastic claw piston 16 moves down to the position of the elastic claw release cavity 30, the flap-type elastic claw is opened and confined in the elastic claw release cavity 30, and the elastic claw piston 16 is limited.
The length of the spline groove of the cylinder barrel 17 is larger than that of the external spline of the spline shaft 18, and after the lower end face of the spline shaft 18 is contacted with the upper end face of the sealing joint 20, the spline still has a certain length of engagement.
The spline engagement length of the center tube 11 and the spline shaft 18 is relatively short, and after the spline shaft 18 is moved down to a proper position, the spline engagement with the center tube 11 is completely disengaged, and when the center tube 11 is rotated in an inverted manner, the spline shaft 18 does not affect the rotation of the center tube 11.
Referring to fig. 1, typically 1-2 anti-rotation handling drill rods 7 are connected at the lower end of the tool string. In order to prevent the rotation of the conductor 2 during drilling, it is more appropriate to choose a cementing process. The anti-rotation drill rod 7 is processed by a common petroleum drill rod. Multiple sets of transverse through holes 8 are machined in the side walls to provide flow channels for the cement. The cylindrical rod 9 is fixed to the drill rod wall by welding or screwing, the main purpose being: after the cement is solidified, the cylindrical rod 9 can be firmly solidified in the cement ring, and the upper string of pipe columns is prevented from rotating.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A hydraulic unlocking releasing device for open hole whipstock sidetracking is characterized by comprising an upper joint (10), a central pipe (11), an upper piston (14), an elastic claw piston (16), a cylinder barrel (17), a spline shaft (18), a sealing joint (20), a rotation stopping key joint (21), a thread gland (22), a lower joint (23) and a shearing pin (24); the upper joint (10), the cylinder barrel (17), the sealing joint (20) and the lower joint (23) are sequentially connected to form an outer cylinder string; the central tube (11) is arranged in the outer tube string, and two ends of the central tube are respectively connected with the upper joint (10) and the rotation stopping key head (21) in a threaded manner; the rotation stopping key head (21) is inserted into the sealing joint (20) through a spline, and the lower part of the rotation stopping key head is pressed tightly through a screw thread gland (22); the screw gland (22) is in threaded connection with the sealing joint (20) and is arranged in an inner cavity formed by the sealing joint (20) and the lower joint (23); the upper piston (14), the elastic claw piston (16) and the spline shaft (18) are sequentially sleeved on the central pipe (11) from top to bottom; the spline shaft (18) is in spline fit with the cylinder barrel (17) and the central tube (11) respectively, and the lower part of the spline shaft (18) is connected with the cylinder barrel (17) through a shearing pin (24); the inner end surface of the lower part of the elastic claw piston (16) is freely pressed with the upper end surface of the spline shaft (18).
2. The hydraulic unlocking releasing device for the open hole whipstock sidetracking according to claim 1, wherein an elastic claw releasing cavity (30) is formed in the cylinder barrel (17), and the outer dimension of an elastic claw at the lower part of an elastic claw piston (16) is larger than the inner diameter of the cylinder barrel (17) and smaller than the inner diameter of the elastic claw releasing cavity (30).
3. The hydraulic unlocking releasing device for the open hole whipstock sidetracking according to claim 1, wherein the inner side and the outer side of the upper piston (14) are respectively provided with a sealing O ring (12) and a first sealing element (13), and the end surfaces at the two sides are limited by the inner end surface of the upper joint (10) and a step on the inner cavity of the cylinder barrel (17).
4. The hydraulic unlocking releasing device for the open hole whipstock sidetracking according to claim 1, wherein a pressure transfer hole (29) is formed in the upper portion of the central tube (11), the pressure transfer hole (29) is a radial through hole, and the upper piston (14), the elastic claw piston (16) and the cylinder barrel (17) form a cavity (27) and are communicated with an inner hole of the central tube (11) through the pressure transfer hole (29).
5. The hydraulic unlocking releasing device for the open hole whipstock sidetracking according to claim 1, wherein a spline shaft downward-moving liquid discharging breather hole (25) and an elastic claw piston downward-moving liquid discharging breather hole (26) are formed in the middle of the cylinder barrel (17), and the spline shaft downward-moving liquid discharging breather hole (25) and the elastic claw piston downward-moving liquid discharging breather hole (26) are radial through holes.
6. The hydraulic unlocking releasing device for the open hole whipstock sidetracking according to claim 1, wherein an external spline is arranged on the outer side of the spline shaft (18) and is in spline fit with the cylinder barrel (17), and an internal spline is arranged on the inner side of the spline shaft (18) and is in spline fit with the central pipe (11).
7. The hydraulic unlocking device for the open hole whipstock sidetracking according to claim 6, wherein the length of the external spline of the spline shaft (18) is larger than that of the internal spline, when the shearing pin (24) is sheared, the lower end face of the spline shaft (18) is jointed with the upper end face of the sealing joint (20), the spline shaft (18) is still meshed with the cylinder (17) through the spline, and the spline shaft (18) is disengaged from the spline of the central tube (11).
8. The hydraulic unlocking device for the open hole whipstock sidetracking according to claim 7, wherein the lower part of the spline shaft (18) is provided with an annular groove (28), and the annular groove (28) is matched with a pin hole processed in the cylinder barrel (17) body and is used for accommodating the shearing pin (24) together.
9. The open hole whipstock sidetracking hydraulic unlocking device of any one of claims 1-8, wherein 4 rectangular splines are machined on the rotation stop key head (21) and are inserted into corresponding spline grooves of the sealing joint (20).
10. An open hole whipstock sidetracking hydraulic unlocking device as claimed in any one of claims 1-8, characterized in that the elastic claw piston (16) presses the second sealing element (15) inside and outside.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121180185.0U CN217380468U (en) | 2021-05-30 | 2021-05-30 | Hydraulic unlocking releasing device for open hole whipstock sidetracking |
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| CN202121180185.0U CN217380468U (en) | 2021-05-30 | 2021-05-30 | Hydraulic unlocking releasing device for open hole whipstock sidetracking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115478799A (en) * | 2021-05-30 | 2022-12-16 | 中石化石油工程技术服务有限公司 | Hydraulic unlocking releasing device for open hole whipstock sidetracking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115478799A (en) * | 2021-05-30 | 2022-12-16 | 中石化石油工程技术服务有限公司 | Hydraulic unlocking releasing device for open hole whipstock sidetracking |
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Effective date of registration: 20240227 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Country or region after: China Patentee after: Sinopec Petroleum Engineering Technology Service Co.,Ltd. Patentee after: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Patentee after: SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD. DRILLING TECHNOLOGY Research Institute Address before: 257017 no.827, Beiyi Road, Dongying District, Dongying City, Shandong Province Patentee before: SINOPEC OILFIELD SERVICE Corp. Country or region before: China Patentee before: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Patentee before: SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD. DRILLING TECHNOLOGY Research Institute |