Push-back rotary steerable device based on drilling hydraulic pressure difference

Abstract

The invention discloses a pushing-type rotary guiding device based on drilling hydraulic pressure difference. The pushing-type rotary guiding device comprises a drilling tool body and a drill bit, wherein the drilling tool body is internally provided with a mud flow channel, at least three mounting grooves arranged at equal spacing are formed in the outer wall of the drilling tool body in the circumferential direction, the mounting grooves are provided with pushing mechanisms, and the drilling tool body is further provided with a liquid inlet hole; the pushing mechanisms comprise cover plates,pushing pistons, normally open valves and driving mechanisms, piston mounting grooves and liquid outlet holes are formed in the outer wall of the cover plates, the pushing pistons are fixedly installed in the piston mounting grooves, and the driving mechanisms are connected with the normally open valves; and the driving mechanisms are used for driving valve cores of the normally open valves to move between the first positions and the second positions, when the valve cores are located in the first positions, first liquid outlets communicate with second liquid outlets, and when the valve coresare located in the second positions, liquid inlets communicate with the second liquid outlets. The pushing-type rotary guiding device uses the pressure of drilling fluid to drive the pushing pistons,and has the advantages of simple structure, fast response speed and convenient arrangement.

Description

technical field [0001] The invention relates to a steering device, in particular to a push-on rotary steering device for a drilling tool based on a drilling hydraulic pressure difference. Background technique [0002] With the continuous improvement of my country's scientific and technological level, drilling technology is becoming more and more mature. In the field of drilling, rotary steerable technology is mainly used in directional wells, horizontal wells, extended-reach wells, etc. Relying on the high-precision servo control mechanism and high-precision attitude measurement mechanism, the drilling direction of the drill bit can be accurately controlled in real time, thereby realizing precise control of the wellbore trajectory. [0003] In the prior art, changing the drilling direction of the drill bit mainly depends on the pushing piston arranged on the drilling tool. There are two main driving modes of the pushing piston, one is hydraulic drive, and the most represent...

AI Technical Summary

Problems solved by technology

The maintenance requirements of the hydraulic system are extremely high, and the manufacturing cost and maintenance cost are high

[0005] Utilizing the disk valve distribution mud drive method, this method cannot stop the extension of the pushing piston in the mode that does not need to be guided (such as when drilling a straight well or an inclined well), which results in a low service life of the piston seal and a piston that is in contact with the well wall. head wear

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