Sand setting assembly for screw drilling tool

Abstract

The invention discloses a sand setting assembly for a screw drilling tool. The sand setting assembly can prevent deposited falling objects from blocking a motor effectively, and comprises a sand setting outer pipe, an upper joint arranged at the upper end of the sand setting outer pipe, a lower joint arranged at the lower end of the sand setting outer pipe and a sand setting inner pipe arranged inside the sand setting outer pipe, wherein the lower end of the sand setting inner pipe is connected with the lower joint, and a single-flow valve is sleeved at the upper end of the sand setting inner pipe; a plurality of elliptical holes are formed in the single-flow valve; a plurality of inner elliptical holes which are matched with the elliptical holes are formed in the sand setting inner pipe; a spring base is arranged on the sand setting inner pipe at the lower end of the single-flow valve; and a spring is sleeved on the sand setting inner pipe between the single-flow valve and the spring base. The sand setting assembly has the advantages that: the sand setting assembly for the screw drilling tool is arranged on the screw drilling tool, so that the deposited falling objects can be prevented from blocking the motor effectively, and the service life of the screw drilling tool is prolonged; and the sand setting assembly is stable in operation, improves operation efficiency and reduces operation cost.

Description

technical field [0001] The invention relates to a sand settling assembly of a screw drilling tool used for preventing dirt from clogging in drilling, milling and milling operations in downhole operations in oil fields. Background technique [0002] In the process of oil well operation, it is often necessary to use screw drilling tools to drill and grind downhole cement plugs, mineral crystallization, and casing decompression. Due to the limitations of site conditions and surrounding environments, it is often impossible to ensure the cleanliness of downhole pipes and rods. At the same time, due to cost control reasons, the aging pipes and rods are reused many times in production, and the soil, sand particles on the ground, rust, scale, dead oil on the pipe and rod walls, and cement and formation sand after drilling in the well are precipitated. After the pump is stopped, the deposits pass through the bypass valve and the inside of the drill pipe and settle down to the motor o...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil well operations, it is often necessary to use screw drilling tools to drill and grind downhole cement plugs, mineral crystallization, and casing removal. Due to the limitations of site conditions and surrounding environments, it is often impossible to ensure the cleanliness of downhole pipes and rods.

At the same time, due to cost control reasons, the aging pipes and rods are reused many times in production, and the soil, sand particles on the ground, rust, scale, dead oil on the pipe and rod walls, and cement and formation sand after drilling in the well are precipitated. After the pump is stopped, the deposits pass through the bypass valve and the inside of the drill pipe and settle down to the motor of the screw drilling tool. These deposits accumulate on the upper part of the motor and form a blockage that prevents the workover fluid from entering the motor. This makes the motor unable to work, resulting in construction failure. Therefore, it is necessary to propose downhole screw drilling tools for replacement, and after the motor is blocked, it is difficult or even irreparable to repair on the ground, which greatly increases the cost of downhole workover in the oil field

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