Constant-pressure and constant-torque tool for well drilling

Abstract

The invention discloses a constant-pressure and constant-torque tool for fluid well drilling. The constant-pressure and constant-torque tool comprises an upper joint, an upper shell, a middle shell, a lower shell, a lower joint, a compensation joint, a mandrel, a limiting baffle ring, a piston, a nut, a first disc spring group, a second disc spring group and a third disc spring group, the mandrel is provided with an inner through hole, a mandrel bypass hole and a limiting step, the first disc spring group and the second disc spring group are mounted in the upper shell, the third disc spring group is mounted in the compensation joint, a multi-head thread groove and an oil injection hole are formed in the middle shell, a multi-head thread groove is formed in the outer portion of the lower joint, a combined sealing groove and an oil injection hole are formed in the lower shell, and a combined sealing groove is formed in the piston. The multi-head thread groove of the middle shell is engaged with the multi-head thread groove of the lower joint, so that compression torsion replacement is achieved, the energy storage function of the disc spring groups is combined, the purpose of constant pressure and constant torque is achieved, the tool is compact in structure and powerful in function, different drilling tools can be protected according to different mounting positions, and the purpose of stable drilling is achieved.

Description

technical field [0001] The invention belongs to the technical field of downhole tools for oil and natural gas drilling engineering, and in particular relates to a constant pressure and constant torque tool for avoiding stuck pipe and reducing stick-slip in ultra-deep wells and extended-reach wells. Background technique [0002] With the continuous development of my country's industry, the demand for oil and natural gas extraction is also increasing. This situation leads to the depletion of shallow oil and gas resources. In order to alleviate the shortage of oil resources, deep wells and ultra-deep wells have begun to carry out oil extraction. However, in the process of drilling ultra-deep wells, extended-reach wells, and horizontal wells, and in the process of coiled tubing operations, especially when encountering soft and hard formations, the PDC bit is prone to slippage during drilling, causing the bit and the drill bit to slip. The frequent holding jump and torsional vibr...

AI Technical Summary

Problems solved by technology

However, in the process of drilling ultra-deep wells, extended-reach wells, and horizontal wells, and in the process of coiled tubing operations, especially when encountering soft and hard formations, the PDC bit is prone to slippage during drilling, causing the bit and the drill bit to slip. The frequent holding jump and torsional vibration of the tool will lead to chipping and damage of the drill bit, signal loss of the MWD logging instrument and damage to the downhole drilling tool assembly, which will reduce the mechanical penetration rate and rock breaking efficiency of the drill bit, and increase the drilling cost

At present, most drilling sites use the method of tripping to solve the phenomenon of stuck drill and stuck drill, and the drilling efficiency will be greatly reduced.

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