Non-supporting-section deceleration turbine drilling tool for petroleum drilling

Abstract

The invention discloses a non-supporting-section deceleration turbine drilling tool for petroleum drilling. The non-supporting-section deceleration turbine drilling tool for petroleum drilling comprises a turbine section, a speed changing supporting section and a drill bit section, wherein the turbine section comprises an upper shell body, a turbine shaft and a plurality of sets of turbine assemblies, the turbine assemblies are overlapped and fixed in the upper shell body, and the turbine shaft is fixedly connected with the plurality of sets of turbine assemblies; the drill bit section comprises a lower shell body and a drill bit connecting shaft; the speed changing supporting section comprises a middle shell body, a supporting mechanism and a speed changing mechanism, wherein the speed changing mechanism comprises an input shaft, an output shaft and a plurality of sets of planetary speed changing assemblies, the upper end of the input shaft is fixedly connected with the turbine shaft,the lower end of the output shaft is fixedly connected with the drill bit connecting shaft, and the lower end of the input shaft and the upper end of the output shaft are connected with the pluralityof sets of planetary speed changing assemblies; and the supporting mechanism comprises an upper thrust bearing set and a lower thrust bearing set, wherein each of the upper thrust bearing set and thelower thrust bearing set comprises a plurality of sets of thrust bearing assemblies. The non-supporting-section deceleration turbine drilling tool for petroleum drilling solves the technical problemsthat an existing turbine drilling tool cannot meet the requirements of small diameter, large power and low rotating speed and that supporting sections are required to be frequently replaced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to an unsupported joint speed reduction turbodrill for oil drilling. Background technique [0002] There are three kinds of downhole power devices for petroleum drilling in the prior art, which are screw drilling tools, turbo drilling tools and electric drilling tools. Among them, the turbo drilling tool is a very important downhole power device in oil drilling engineering. Turbo drilling tools use high-pressure drilling fluid as energy to drive the drill bit downhole to complete the drilling work. It has the characteristics of simple structure, convenient use, high temperature resistance, deep well drilling, high speed, high power, long life, etc., and is widely used in oil drilling engineering. However, due to the high output speed of the turbodrill (600-1500r / min), it cannot be used in conjunction with commonly used low-speed (low speed refers to below 400r / min) drill bits, fo...

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