Static Offset Push-By Rotary Steerable Drilling Tool

Abstract

The invention discloses a static bias backup type rotary steering well drilling tool which comprises a rotary core shaft, a non-rotary outer sleeve segment, a circuit mounting segment and a coupler mounting segment. The non-rotary outer sleeve segment, the circuit mounting segment and the coupler mounting segment are arranged on the rotary core shaft, and the non-rotary outer sleeve segment, the circuit mounting segment and the coupler mounting segment are connected in sequence in the axial direction. Segmentation design is adopted by the rotary steering well drilling tool, the structures of the segments are simpler, and mounting is more convenient. Meanwhile, a damping hole is adopted by an oil path to replace the oil inlet and oil return functions of a high pressure valve, type selection difficulty of the high pressure valve is avoided, standby pressure can be kept in a plunger type cylinder all the time, and the response speed of a rib is improved.

Description

technical field [0001] The invention belongs to the field of petroleum drilling, and in particular relates to a rotary steerable drilling tool capable of realizing directional drilling and wellbore deflection, in particular to a static offset pushing type rotary steerable drilling tool. Background technique [0002] Rotary steerable drilling technology is a cutting-edge automatic drilling technology developed in the 1990s in the world. It is the highest stage of drilling technology development in the world today - the main content of closed-loop automatic drilling. Its appearance is the world's drilling technology. A qualitative leap. Compared with the traditional slide-steering drilling, the rotary-steering drilling technology is more suitable for the ocean because the downhole tools are always working in a rotating state, so the wellbore cleaning effect is better, the wellbore trajectory control accuracy is higher, and the displacement extension capability is stronger. De...

AI Technical Summary

Problems solved by technology

[0004] Usually, the downhole rotary steerable drilling tool also includes a hydraulic system and a control system, and the hydraulic system and the control system are integrated on the non-rotating casing, which will increase the difficulty of manufacturing the non-rotating casing, and will also make the structure of the rotary steerable drilling tool Complicated and difficult to install; at the same time, the hydraulic system of the existing rotary steerable drilling tools uses a reversing valve to realize the oil inlet and return of the system. Due to the high pressure in the oil circuit, it is very difficult to select the high pressure valve. At the same time, the high pressure in the oil circuit will also lead to poor safety of the system. The requirements for the rated pressure of the hydraulic pump are high, and the requirements for the strength and sealing of the oil circuit are relatively high.

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