Automatically controlled rotation-controllable drilling system

Abstract

The present invention relates to an automatic control rotary direction-controlled drilling system, which comprises drill casing driven by drill rod, bit supported by drill bit rod and equipped with upper portion positioned in the casing and lower portion extended downwards from casing. The drill bit rod can be rotatably supported between upper end and lower end by means of universal joint in the casing, and can be driven by casing. An offset spindle is used to make drill rod rotate around universal joint to control drill bit direction, and the turbine driven by drilling fluid and A.C. generator and combined to drive motor, said motor makes the offset spindle rotate and uses position detection unit signal input to make servo control. A brake is used to make offset spindle and drill bit rod axis retain static or the turbine is connected with offset spindle to make offset spindle rotate to drill casing.

Description

technical field [0001] The present invention relates generally to methods and apparatus for drilling wells, especially oil wells for the recovery of petroleum products. More specifically, the present invention relates to an automatically controlled rotary steerable drilling system that can be connected directly to a rotating drill pipe, and can also utilize a mud motor and / or thruster and / or flexible tubing sub) to connect the system in a rotary drill pipe, enabling the automatic control of the rotary steerable drilling system to be detached from the rotary drill pipe, for example for mud motor driven drilling, to make the drill pipe rotate or not, and to enable The direction of the wellbore drilled by a drill bit can be precisely controlled, and the speed, torque and weight acting on the drill bit can be precisely controlled. In order to control the speed and torque of the mud motor, a controllable discharge valve is set on the fluid line of the mud motor, so that a part of ...

AI Technical Summary

Problems solved by technology

If not corrected, the borehole may extend too close to another borehole, preventing the borehole from reaching the desired "subterranean target," or the borehole may be too long due to the meandering progress of the borehole. long

These undesirable factors make the drilling of the wellbore prohibitively expensive and reduce the discharge efficiency of the oil recovery from the subsurface formations concerned

In addition, a non-rotating drill pipe increases friction while dragging, which reduces control of the "weight on the bit" and slows the rate of penetration of the bit, which adds to the cost of drilling

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