Self-propelled jet drill bit forradial horizontal well

Abstract

The invention relates to a self-propelled jet drill bit for a radial horizontal well.The self-propelled jet drill bit mainly comprises a drill bit, a rotating shaft, a shell, a turbine stator, a turbine rotor, a rear nipple, a centralizer and a rear connecting pipe,the shell is internally provided with a turbine system, the shell is placed in the middle of the drill bit and the centralizer, the front part of the shell is connected with the drill bit through the rotating shaft, the rear part of the shell is connected with the centralizer through the rear connecting pipe, the turbine rotor is tightly fixed on the rotating shaft through a rotor nut and flat keys, the rear part of the rotating shaft is connected with the rear nipple through a sliding bearing sleeve, and the centralizer and therear connecting pipe are sleeved in a spaced mode. The turbine system transmits torque to the rotating shaft through the flat keys, the drill bit is driven by the rotating shaft to rotate to form drilling bit rotating jet drilling, the rock breaking ability and drilling efficiency are improved, and the rotary bit plays the role of modifying the well wall; fluid through the turbine system is ejected from a rear jet hole on the shell to generate self-propelled force, and s the jet drill bit is pushed forward to operate; and the centralizer plays the role ofcentralizer of the rear connecting pipe to prevent counter torque, and frictional resistance in the process of drilling is reduced.

Description

technical field [0001] The invention relates to a self-propelled jet drill bit for radial and horizontal wells. Background technique [0002] As the development of my country's oil and gas fields enters the middle and later stages, the water content of oil and gas wells increases, the effectiveness of water injection operations becomes lower and lower, the difficulty of oil and gas production increases, and it becomes extremely difficult to stabilize the production of oil and gas wells; in undeveloped oil and gas, the working conditions There are a large number of complex oil and gas reservoirs, and oil and gas reserves that are difficult to exploit account for a large proportion. At present, radial horizontal well drilling technology is widely used in the above-mentioned old oil and gas fields and oil and gas fields that are difficult to develop. Radial horizontal well technology can effectively reduce the cost of oil field development, save construction resources, increase ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to improve a series of problems such as insufficient rock-breaking ability, insufficient self-propelled force and irregular shape of the well wall of the traditional jet drill bit.

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