Hybrid rotary steering device

Abstract

A hybrid rotary steering device consists of a rotating shaft, at least three first hydraulic mechanisms and at least three second hydraulic mechanisms. The rotating shaft rotatably drives a tool head,the rotating shaft includes an upper shaft part, a lower shaft part and a steering part, the upper shaft part and the lower shaft part are axially spaced a distance, and the upper shaft part is rotatably connected with the lower shaft part through the steering part; the at least three first hydraulic mechanisms are installed on the upper shaft part, the at least three second hydraulic mechanismsare installed on the lower shaft part, the second hydraulic mechanisms are suitable for driving push members to push the borehole wall to guide the tool head, and the first hydraulic mechanisms are connected with the second hydraulic mechanisms in this way so that the first hydraulic mechanisms can drive the second hydraulic mechanisms to drive the push members. The device combines the advantagesof directional guide and pushing type guide, the influence of stratum properties on the build-up rate is eliminated to a great extent, higher build-up rate can be provided, and the requirement for energy consumption is greatly reduced.

Description

technical field [0001] The application relates to the field of drilling, in particular to a hybrid rotary steerable device for controlling drilling steering. Background technique [0002] In order to obtain natural resources stored underground, drilling exploration is required. In many cases, the wellbore and the derrick are not aligned, but need to form a certain offset or curvature, which forms a horizontal or vertical offset or other types. The process of complex boreholes is called directional drilling. The process of controlling the direction of the drill bit in the process of directional drilling is called steering. There are two types of modern steerable drilling: slide steerable and rotary steerable. During slide-steering drilling, the drill string does not rotate; the drill bit is driven to rotate by bottom hole power drilling tools (turbo drilling tools, screw drilling tools). The screw drilling tool and part of the drill string and the centralizer can only sl...

AI Technical Summary

Problems solved by technology

[0004] Point-to-point steering and push-to-push steering have their own characteristics. Generally speaking, the build-up rate of point-to-point steering is relatively stable and is less affected by WOB and formation conditions, but its extreme value of build-up rate is low. It is difficult to meet the requirements when the build-up rate is low. Relatively speaking, the build-up rate of the push-on steering is not stable, and is greatly affected by the WOB and formation conditions. When the WOB is low and the formation hardness is appropriate, the build-up rate is high , the wellbore trajectory can be quickly adjusted, but the steering ability is significantly reduced when encountering too soft formations

[0005] Recently, some people have proposed a hybrid steering tool, but the driving method for providing driving force has not been well realized.

Images