Local electric rotary drilling device

Abstract

The invention relates to a local electric rotary drilling device. The local electric rotary drilling device comprises an upper drill rod, a drill collar, an upper short joint, a local electric rotary device, a lower short joint and a drill bit, wherein the local electric rotary device is connected with the upper short joint and the lower short joint by threads; the central shaft of the local electric rotary device penetrates through from an inner barrel; a rotary outer barrel is sleeved outside the inner barrel; a connection pin is arranged between the inner barrel and the rotary outer barrel; an axial-flow hydroelectric generator, an upper electricity storage, a motor, a lower electricity storage, a piezoelectric transducer and a pressure-bearing device are sequentially installed in the inert barrel from top to bottom; the axial-flow hydroelectric generator, the upper electricity storage and the motor are sequentially connected; the lower electricity storage is also connected with the motor; the motor is connected with the central shaft and the inner barrel respectively; the pressure-bearing device is connected with the piezoelectric transducer; and the piezoelectric transducer is connected with the lower electricity storage. According to the local electric rotary drilling device disclosed by the invention, a part of the dynamic energy of a fluid is converted to electric energy and stored, then a drill tool at the bottom is driven to rotate to drill, thus the dynamic energy and pressure energy of the drilling fluid are adequately utilized, and the drilling rate is increased.

Description

1. Technical field: [0001] The invention relates to a drilling device in the field of rock-breaking technology in petroleum drilling engineering, in particular to a local electric rotary drilling device. 2. Background technology: [0002] With the continuous development of drilling technology, drilling technology and drilling tools have also been developed rapidly. Especially with the increase in the number of special wells such as horizontal wells and extended-reach wells, the development of new drilling technologies and new downhole tools has been accelerated. Drilling methods range from sudden drilling to the current commonly used rotary drilling, rotary steerable drilling, geosteering drilling, and then to new drilling methods such as casing drilling and laser drilling. [0003] At present, the main technical difficulties of drilling technology mainly include: (1) There are technical bottlenecks in safe and efficient drilling of extended-reach horizontal wells in deep f...

AI Technical Summary

Problems solved by technology

However, for the drilling of some complex well types, such as extended-reach horizontal wells and long horizontal section horizontal wells, etc., rotary drilling has many disadvantages, such as limited by the strength of the drilling tool and the structure of the well body, frequent drilling accidents, Drilling costs are high

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