A kind of injection method to reduce torque and pressurize device

Abstract

The invention provides a device for decreasing torque and increasing pressure by a jetting method. A fixed valve core and a movable valve core and a movable valve core are separately arranged in an outer barrel wall; a gap is reserved between the movable valve core and a cardan shaft to form an annulus; drilling fluid passages are formed in the movable valve core; the fixed valve core sleeves the lower part of the movable valve core; an airtight cavity is formed among the fixed valve core, the movable valve core and the outer barrel wall; an elastic component is arranged in the airtight cavity; through holes I which are corresponding to each other are respectively formed in the fixed valve core and the movable valve core; the outer barrel wall is provided with nozzles. The device has few parts, is long in service life, low in price and not easy to damage, and can be matched with coiled tubing for use; owning to the unique characteristic of no torque of the device, a situation that top coiled tubing reversely rotates to be knotted due to rotation of a bottom power drill tool during coiled tubing drilling can be prevented; flow of ejected liquid can be automatically regulated according to different drilling fluid pressure, and therefore reaction torque of the outer wall of a screw drill tool is automatically balanced; assembly can be performed in a pup joint manner, so that replacement is convenient.

Description

technical field [0001] The invention belongs to the technical field of oil and gas wells, and in particular, the invention relates to a torque reducing and pressurizing device by spraying method. Background technique [0002] At present, during coiled tubing drilling, the drill bit is rotated by the downhole power motor, and the orientation and drilling functions are realized by controlling the tool face of the lower drilling tool. During the process of rock breaking, the drill bit will generate counter torque, which will cause the drill tool to rotate in reverse, resulting in unstable control of the tool face, thereby affecting the continuity and speed of drilling. [0003] To solve this problem, the relatively advanced horizontal well drilling tool—downhole tractor, also called downhole crawler, has been extensively tested in actual operations with good results. However, due to the design of the tractor itself, there is a defect that it cannot realize continuous operation...

AI Technical Summary

Problems solved by technology

However, due to its own design, the tractor has a defect that it cannot realize continuous operation, prolong the construction period and increase the cost

At the same time, the tractor device has many parts, which are easily damaged and have a short service life.

An analysis of a counter-torque removal drilling device has been developed. It uses a planetary drive, and the inner and outer double drill bits rotate in reverse to achieve the purpose of anti-torque removal. However, its structure is complicated, its working stability is not high, and its service life short

[0004] The invention patent with the patent number CN201210207397.2 discloses a composite drilling method for drag reduction and torsion reduction in wells with complex structures. The downhole drag and torsion reduction device is installed between the upper drilling tool and the measurement-while-drilling drilling tool assembly, so that the upper drilling tool can The drilling tool rotates independently relative to the measurement while drilling; the anti-torque balance device is installed between the power drilling tool and the drill bit to eliminate the interference of the reaction torque generated by the power drilling tool on the tool face. Change drill string sliding drilling to rotary drilling, reduce frictional resistance and torque loss, and reduce the incidence of drill string sticking complex situations; the anti-torque balance device can effectively eliminate the impact of the anti-torque generated by the power drilling tool on the tool face, and control The tool face remains stable, improves the control accuracy of the wellbore trajectory, and improves the quality of the wellbore. However, this invention patent cannot realize the function of pressurization, and is only suitable for efficient drilling of wells with complex structures.

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