Combined type guiding drilling tool and method

Abstract

The invention provides a combined type guiding drilling tool and method. The combined type guiding drilling tool comprises a force transmission cylinder and a bearing body, the bearing body is arranged in the force transmission cylinder, the bearing body and the force transmission cylinder are hinged through an inner hinge structure, and the lower end of the bearing body is connected with a drill bit; and an annular moving space is formed between the force transmission cylinder and the bearing body, at least three sets of driving hydraulic cylinders arranged at intervals are arranged at the lower portion of the bearing body in the circumferential direction, and each driving hydraulic cylinder comprises a piston structure containing cavity formed in the outer wall of the bearing body and a driving piston structure arranged in the piston structure containing cavity. The driving piston structures can push the force transmission cylinder and the bearing body to move relatively, and the force transmission cylinder can abut against the well wall. The driving hydraulic cylinders are arranged between the force transmission cylinder and the bearing body, the rotary guiding size is greatly reduced, rotary guiding can be accurately controlled, and therefore extension of a controllable track is achieved.

Description

technical field [0001] The invention relates to the technical fields of drilling technology and oil and gas production, in particular to a composite steering drilling tool and a composite steering drilling method. Background technique [0002] The control of production costs has always been the goal pursued by oil and gas drilling. With the development of unconventional oil and gas fields, the requirements for drilling equipment are getting higher and higher. Automatic and intelligent high-efficiency drilling technology has become the key to reduce costs and improve efficiency. mainstream technology; in addition, drilling technology also has a large number of applications in the field of geological engineering and mineral development. [0003] Rotary Steerable Drilling Technology is currently the most representative and advanced drilling technology in the world. According to the working mode of the downhole tool system, the Rotary Steerable Systems (RSS, Rotary Steerable Sys...

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Problems solved by technology

[0005] At present, coiled tubing is used to transmit bent joint screw motors to realize sidetracking drilling with controllable trajectory of medium and short radius, but the orientation mode is sliding guide, and the whole drill string does not rotate. The change of the tool face angle of the joint can change the inclination and azimuth performance of the drilling tool. There are limitations such as the drilling tool does not rotate during the directional operation, and the short-radius directional drilling operation cannot be completed. The accuracy of the wellbore trajectory is poor. Inherent disadvantages such as low strength, easy damage and fracture of the pipe string, not suitable for high torque, and the diameter of the drilled hole is too small to meet the basic needs of oil and gas reservoir development for the conductivity of oil and gas wells, so it is almost incapable of short-radius lateral drilling , it cannot work in the category of ultra-short radius and extremely short radius lateral drilling with a turning radius of less than 10 meters

[0006] Another method that can realize short-very-short radius lateral drilling is to drive the drill bit through flexible drill pipes to realize short-very short-radius lateral drilling, that is, to use short drill pipes with a single section length less than 1.5 meters in series with flexible drill strings The adjacent short drill rods rely on the ball head and the ball bowl to transmit the pulling force, and rely on the splines arranged between the ball head and the ball bowl to transmit the torque, and the flexible drill string drives the bottom drill bit to rotate to achieve rock breaking; this method can Relying on the deflection effect of the skewer to achieve short-to-very short radius sidetracking, however, this method cannot achieve wellbore trajectory control and obtain a certain accuracy of wellbore trajectory during the wellbore extension process, and the wellbore buckling is serious, hindering the drill bit. drilling, and the twisted and uncontrollable well trajectory is also difficult to meet the site requirements

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