Mechanical rotary steering tool

Abstract

The invention discloses a mechanical rotary steering tool, which comprises an upper joint, a control unit, an execution unit, and a drill bit. According to the technical scheme, the end of a pin is mounted in the outer wall channel of an indexing mechanism, when pump pressure is increased, the indexing mechanism rotates and moves in the axial direction in the meantime to drive a mobile mandrel tomove along the axial direction, so that a radical passage hole at the lower end of the mobile mandrel communicates with a radical passage hole of a guide joint, and a high-pressure drilling fluid enters and pushes a telescopic arm to move outwards in the radial direction to realize a steering function; when the pump pressure is increased again, the limiting point of the cooperation between the indexing mechanism and the pin is switched, the indexing mechanism is reset, the mobile mandrel is reset under the action of the elastic force of a spring a, the drilling fluid is discharged from a bypass valve, and the telescopic arm is retracted under the action of the elastic force of a spring b to stop steering operation. According to the mechanical rotary steering tool, control of a wellbore trajectory and lowering of the cost of the rotary steering tool can be realized, and the mechanical rotary steering tool is suitable for using in structural wells such as horizontal wells and large displacement wells.

Description

Technical field [0001] The invention relates to a mechanical rotary steering tool used in petroleum and natural gas drilling engineering, and is particularly suitable for structural wells such as directional wells and branch wells. Background technique [0002] With the continuous exploration and development of oil and natural gas resources, conventional oil and gas resources are gradually decreasing, and the exploitation of oil and gas resources has gradually developed from conventional resources to unconventional resources, from land drilling to ocean drilling, making the technology of directional wells and branch wells increasingly mature. By adopting directional well and branch well technology, modern oil and gas resources can be exploited economically and efficiently. The exploration and development of modern oil and gas resources puts forward new requirements on drilling technology, especially in the process of directional well drilling, due to the difference of the formati...

AI Technical Summary

Problems solved by technology

Most of the existing rotary steerable tools are system tools, that is, the steering mechanism, the measurement system, the control system, etc. jointly constitute the rotary steerable system tool. Although the tool performance is excellent, the cost of use is too high, which is not conducive to cost reduction

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