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Retrievable locking switchgear for downhole tools
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A technology of switch devices and downhole tools, which is applied in the direction of wellbore/well valve devices, wellbore/well components, earthwork drilling and production, etc., which can solve the problems of prone to misoperation and inconvenient operation, so as to avoid misoperation, Easy and reliable operation
Active Publication Date: 2016-05-25
BAOJI PETROLEUM MASCH CO LTD +2
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Summary
Abstract
Description
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Problems solved by technology
[0003] The current operation method of downhole tools is basically realized by rotating the pipe string or by lifting and lowering the pipe string. The operation of these two methods must rely on the experience of the operator to complete, and it is easy to misuse
Another method is to change the shape of the tool and complete the operation of the downhole tool by throwing a ball once. However, this method can only be opened. To close it, the pipe string must be lifted to replace the tool before the next operation. Or through grinding and milling can be achieved, the operation is very inconvenient
Method used
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Embodiment 1
[0050] The present invention is applied to workover tools such as cutters, for example, when connected with centralizers, it can be used in the cutting and recovery operations of underwaterwellhead equipment, such as Figure 1-Figure 5 shown.
[0051] When the cutter of the present invention is housed and enters the predetermined position and opens the cutting knife to carry out operations, the ball can be thrown into the tool by the ball thrower on the ground, and the mud passage can be blocked when the lower ball seat sliding sleeve 8 is reached. At this time, it enters the pressure holding stage, and the pressure continues to rise. When it rises to the shearing pressure of the lower shear pin 7 connected to the lower inner sleeve 5, the lower shear pin 7 is sheared, and the lower ball seat sliding sleeve 8 joint pitches move down under the action of mud pressure, and stop when reaching the lower shoulder surface of the outer shell, because the fluid channel opening is arra...
Embodiment 2
[0053] The present invention is applied to completion tools such as packers, such as Figure 6 , Figure 7 shown.
[0054] Go down into the well with the operation string, after reaching the operation section, throw the ball, and then perform the same action as mentioned above, open the tool and lock it, the packer rubber tube 20 is deformed to achieve sealing, when the operation is completed, the pipe string needs to be recovered, at this time Throwing the ball twice, the recovery action of the opening tool, as mentioned above, the packer rubber tube 20 rebounds to realize unsealing, and the string can be lifted.
Embodiment 3
[0056] The present invention is applied on drilling tools, such as Figure 8 , Figure 9 shown.
[0057] When it is connected with the downhole drilling tool assembly (DHA), that is, the structure is part of the downhole DHA, and the front is the drill bit. Under normal circumstances, it can drill with full diameter and full displacement without affecting the drilling effect and drilling efficiency. When special drilling conditions occur and the opening tool is used to ream the hole using the cutter 21, the opening tool and the retracting tool are as described above. Finally, when the pressure rises further until the upper shear pin is cut off, the sliding sleeve goes down. Since the lower ball seat sliding sleeve 8 also has a fluid passage port, the drilling fluid can also bypass the ball and the lower ball seat sliding sleeve 8. Drilling with cutter 21 full displacement does not need to lift and lower the pipe string.
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Abstract
The invention discloses a switching device used for a downhole tool and allowed to be withdrawn and locked. According to the switching device, two shoulder faces are arranged on the inner wall of an outer shell, a limit sleeve is arranged on the upper shoulder face in a seating mode, and a lower ball seat sliding sleeve is arranged on the lower shoulder face. The inner wall of the outer shell is sleeved with an upper inner sleeve, and the inner wall of the upper inner sleeve is sleeved with an upper ball seat sliding sleeve. A lower inner sleeve is arranged between the lower end of the upper inner sleeve and the upper ball seat sliding sleeve. A stepped face is arranged on the outer surface of the middle of the lower inner sleeve, faces downwards and is correspondingly matched with the upper end of the limit sleeve. A shoulder face is machined on the surface of the inner wall of the lower inner sleeve and matched with the lower end face of the upper ball seat sliding sleeve. A blind hole is formed in the radial direction of the outer wall of the upper inner sleeve, and a locking mechanism is arranged in the blind hole. A locking groove is formed in the inner wall of the outer shell and matched with the locking mechanism. The switching device used for the downhole tool and allowed to be withdrawn and locked not only is suitable for a well-repairing cutting device and a well completing tool, but also is suitable for a drilling tool and any tool which is correlated with the drilling tool and needs to be opened, locked and closed.
Description
technical field [0001] The invention belongs to the technical field of land and sea oil and gas drilling equipment, and relates to a switch device for a retractable and locked downhole tool. Background technique [0002] In recent years, with the increasing difficulty of mining oil and gas resources, the downhole construction technology has become more and more diverse and complex. requirements. [0003] The current downhole tool operation method is basically realized by rotating the pipe string or by lifting and lowering the pipe string. The operation of these two methods must rely on the experience of the operator to complete, and it is easy to misuse. Another method is to change the shape of the tool and complete the operation of the downhole tool by throwing a ball once. However, this method can only be opened. To close it, the pipe string must be lifted to replace the tool before the next operation. Or through grinding and milling can be achieved, which is very inconv...
Claims
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Application Information
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