Underground sliding sealing tool, infinite extension drilling device and drilling method thereof
A sliding sealing and sealing device technology, which is applied in the drilling driving device, drilling equipment and method, drilling equipment and other directions in the wellbore, can solve the problems of limited drilling extension ability, improve the rock breaking efficiency and reduce the rock breaking efficiency. Difficulty, the effect of reducing the number of applications
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[0038] Implementation mode one:
[0039] Such as figure 1 with 2 As shown, this embodiment provides a downhole sliding sealing tool, including a downhole power device and a sealing device installed on the downhole power device. The downhole power device includes an upper mandrel 1, a middle mandrel 4, and a lower mandrel 6. The upper mandrel 1, the middle mandrel 4, and the lower mandrel 6 are all hollow structures. In this embodiment, the hollow portion at the top of the upper mandrel 1 is a tapered structure with a wide upper portion and a narrow lower portion, and the inner surface of the tapered structure is threadedly connected with the drill rod 20. The middle mandrel 4 has an axially symmetric structure. The upper part of the middle mandrel 4 and the lower part of the upper mandrel 1 are fixedly connected by internal threads, and the lower part of the middle mandrel 4 and the upper part of the lower mandrel 6 are fixedly connected by external threads. The lower part of th...
Example Embodiment
[0040] Implementation mode two:
[0041] Such as figure 1 As shown, the first embodiment is further optimized, a lower housing 7 is installed in the lower mandrel 6, and the lower housing 7 and the middle mandrel 4 are fixed by a packer rubber fixing sleeve 5, wherein The hollow part below the lower housing 7 in the lower mandrel 6 constitutes the lower central flow passage 19, and the gap between the lower mandrel 6 and the lower housing 7 constitutes the flow passage 16 between the double walls. The flow passage 15, the lower central flow passage 19, and the flow passage 16 between the double walls communicate with each other. As a preference of this embodiment, the inner diameter of the upper central flow passage 15 is larger than the inner diameter of the lower central flow passage 19.
[0042] Such as figure 1 As shown, this embodiment is further optimized, a plug 8 is provided in the middle of the lower central flow passage 19, the upper central flow passage 15 and the tool ...
Example Embodiment
[0043] Implementation mode three:
[0044] To further optimize the first or second embodiment, a plunger barrel 13 is provided at the bottom of the piston barrel 10, the piston barrel 10 is in communication with the plunger barrel 13, and the piston in the piston barrel 10 is connected to the plunger barrel 13 The plunger 11 is an integral connection. The lower part of the plunger barrel 13 is provided with an oil injection hole for delivering pressurized hydraulic oil from the piston barrel 10 to the gap between the upper mandrel 1 and the open-hole packer rubber barrel 3 14. As a preference of this embodiment, the inner diameter of the piston barrel 10 is larger than the inner diameter of the plunger barrel 13.
[0045] This embodiment also provides an infinite extension drilling device, which includes a drill pipe 20, a screw power drill tool 21 and a PDC bit 22, and also includes the downhole sliding sealing tool described in this embodiment, the upper part of the downhole sli...
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