Hydraulic torque converter

Abstract

The invention discloses a hydraulic torque converter and mainly relates to the field of oil and gas well drilling. The hydraulic torque converter is installed between a bottom drilling tool combination and a drill column. The hydraulic torque converter is mainly composed of a center shaft, an outer shell, bearing devices, an adjustor, a spring, a hydraulic clutch, a coupler, a torque generator and a nozzle. Due to the special structure and the special connecting function relation among the center shaft, the outer shell, the bearing devices, the adjustor, the spring, the hydraulic clutch, the coupler, the torque generator and the nozzle, the hydraulic torque converter can achieve drill column rotation on the premise that reactive torque of the bottom drilling tool combination is balanced and a tool face is stabilized and can also complete tool face adjustment or composite rotation well drilling work. The drilling speed of a well of a complex structure can be better increased, the well track control precision can be better improved, in addition, a conventional sliding well drilling manner can be changed into a rotation well drilling manner, sliding friction resistance of the drill column is effectively reduced, and the hydraulic torque converter is of great significance in improving the well drilling efficiency of the well of the complex structure. Meanwhile, the hydraulic torque converter has the beneficial effects of being simple in structure, convenient to operate and install, safe and reliable.

Description

technical field [0001] The invention mainly relates to a hydraulic torque converter in the field of drilling tools, and is especially suitable for the fields of oil and gas drilling, coal bed gas drilling, geological exploration and mine drilling. Background technique [0002] With the increasing difficulty of oil and gas field development and the rapid development of drilling technology, the number of wells with complex structures such as extended-reach wells, long horizontal wells, and multi-level lateral wells is increasing day by day, which puts forward higher requirements for drilling technology. In the process of directional drilling, domestic mud motors are mainly used for drilling operations in the form of sliding drilling. In order to balance the counter torque generated by the downhole power motor and stabilize the tool face of the downhole drilling tool assembly, the way of locking the rotary table at the wellhead is usually used. Except for the drill bit rotating...

AI Technical Summary

Problems solved by technology

In the process of directional drilling, domestic mud motors are mainly used for drilling operations in the form of sliding drilling. In order to balance the counter torque generated by the downhole power motor and stabilize the tool face of the downhole drilling tool assembly, the way of locking the rotary table at the wellhead is usually used. Except for the drill bit rotating to break the rock, all other drill strings including the mud motor casing do not rotate, and lie flat on the bottom of the well due to their own weight, resulting in high frictional resistance during sliding drilling, making it difficult to effectively apply WOB, and sticking is prone to occur Such as downhole safety accidents, especially in the process of guided drilling such as extended reach wells, long horizontal section horizontal wells, unconventional wells, etc., the frictional torque is large, the drill string is difficult to lift and lower, and the pressure is difficult to pressurize during drilling.

[0003] Chinese patents 201310422132.9 and 201010189645.6 both provide downhole anti-torque control devices, and discuss their technical features in detail. According to the patent description, it can be seen that the function of downhole anti-torque control can basically be realized, but there are still several deficiencies that cannot be fully realized. It meets the technical requirements of on-site drilling technology. (1) The anti-torque control device provided cannot make the drill string rotate as a whole, that is, during the steering drilling process, the drill string as a whole is still lying flat on the bottom of the well and is in a sliding drilling state, and the frictional resistance is very low. (2) The anti-torque control device provided can control the anti-torque of the bottom hole assembly, but the ability to control the wellbore trajectory is lower than that of the existing technology, which is not conducive to the development of complex structure wells. Drilling construction; (3) It can be seen from the structural diagram that the internal structure is relatively complex, with many parts and components, and requires high processing technology

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