Downhole low-pressure pulse jet modulator

Abstract

The invention discloses a downhole low-pressure pulse jet modulator. The downhole low-pressure pulse jet modulator mainly comprises an outer casing 1 as well as turbine unit stators 2, turbine unit rotors 3, an upper mushroom valve 6 and a lower mushroom valve 7 which are mounted in the outer casing 1, wherein the turbine unit stators 2 are fixed in the outer casing 1; the turbine unit rotors 3 are mounted in the turbine unit stators 2 and form rotation fit with the turbine unit stators 2; an axial channel is formed in the turbine unit rotors 3, and a fluid feeding port 4 is formed in the lower part of the axial channel; the upper mushroom valve 6 is connected and fixed at the lower end of the turbine unit rotors 3; the lower mushroom valve 7 is fixed in the outer casing 1 below the upper mushroom valve 6; a plurality of mutually communicated upper mushroom valve flow channels 9 and lower mushroom valve flow channels 10 are axially distributed in the upper mushroom valve 6 and the lower mushroom valve 7 respectively; the upper mushroom valve 6 and the lower mushroom valve 7 are in rotating seal fit. The downhole low-pressure pulse jet modulator has the advantages that the modulator is simple in structure, convenient to operate and mount, safe and reliable, the drilling rock breaking efficiency is increased, and the comprehensive cost for drilling is reduced.

Description

technical field [0001] The invention relates to an underground low-pressure pulse jet modulator, which belongs to the fields of oil and natural gas drilling, geological exploration, mine drilling devices and the like. Background technique [0002] In the process of oil and gas drilling, geological exploration, mining deep wells, and ultra-deep wells, in addition to objective factors such as drilling equipment and the reduction of physical drillability of rock formations, excessive bottom-hole pressure difference will affect the rate of penetration of deep and ultra-deep wells. one of the important factors. The fundamental reason is that the greater the pressure difference at the bottom of the hole, the pressure-holding effect at the bottom of the hole during drilling, so that the newly drilled cuttings cannot be removed from the bottom of the hole in time, resulting in repeated rock breaking by the drill bit, which greatly reduces the impact of the drill bit. Drilling speed...

AI Technical Summary

Problems solved by technology

The fundamental reason is that the larger the bottom hole pressure difference, the drill bit will hold the bottom of the hole during drilling, so that the newly drilled cuttings cannot be cleared from the bottom of the hole in time, resulting in repeated rock breaking of the drill bit, which greatly reduces the Drilling speed, resulting in increased drilling costs

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