Downhole motor

Abstract

The invention provides a downhole motor comprising a casing, a mandrel, a motive eccentric weight and at least one turbine assemblies. The mandrel is pivotally mounted in the casing and penetrates the turbine assemblies, the motive eccentric weight is mounted on the mandrel, and the turbine assemblies are mounted in the casing. Liquid energy of drilling liquid is converted into mechanical energy via the turbine assemblies and a liquid carrying mandrel assembly, and the downhole motor is capable of supplying power for a drill for the first time from both the liquid carrying mandrel assembly and the turbine assemblies. Since bi-directional power is supplied to the downhole drill, drilling speed is increased, drilling footage is deepened, drilling accidents are reduced, shaft building period is shortened, and exploration of oil and gas is accelerated.

Description

Technical field [0001] The invention relates to the field of geology, in particular to a bottom hole engine. Background technique [0002] The increasing human demand for fossil energy directly poses huge challenges to global oil and gas exploration and development. Drilling is the "leading" of the petroleum industry, and the investment in drilling accounts for about half of the upstream investment of the entire petroleum industry. The level of drilling engineering technology is directly related to the success or failure of petroleum exploration and development, and determines the development potential and competitiveness of the upstream petroleum business. [0003] The development trend of drilling technology at home and abroad has evolved from the traditional establishment of oil and gas channels to the use of drilling methods to achieve exploration and development geological purposes, and to increase single well production and ultimate recovery. [0004] Since the beginning of th...

AI Technical Summary

Problems solved by technology

[0007] In the current drilling industry, diamond compact drill bits (hereinafter referred to as PDC drill bits) have gradually replaced the old-fashioned roller cone bits. The trajectory is extremely disordered, and it often produces harmful lateral, longitudinal and torsional vibrations and combinations of these harmful vibrations

[0010] The effect of using the screw with the PDC bit is ideal in soft formations or medium-hard formations, but for hard formations and extremely hard formations, it is fundamentally impossible to increase the drilling speed. Generally speaking, there are the following deficiencies and defects: (1) Due to the structure of the screw itself Due to the constraints of the principle, even in the soft bottom layer, the cutting teeth of the PDC bit can theoretically shear the rock formation at a frequency of no more than 300 revolutions per minute, from a single limited speed (up to 300 revolutions per minute). Fundamentally, it cannot solve the problem that the PDC bit cannot penetrate into the formation

(2) In strata with complex formations and frequent rock-type interbeds, the problems of excessive torque and swing of drilling tools cannot be solved, so that drilling tool accidents still exist

(3) Since the inner wall of the stator of the screw is a rubber part, it cannot be used in HTHP high-temperature and high-pressure wells, thus limiting the scope of use and causing technical bottlenecks in drilling applications

(4) The application window of WOB parameters is too small, and the range of increasing WOB is limited in formations that are sensitive to WOB. Once the WOB is increased, the pressure drop will increase, which will shorten the life of the screw and cause the screw to degumming and block; the screw will fall into the well , increase the cost of salvage, delay the drilling cycle, and increase the risk of drilling

(5) The structure of the screw makes its service life too short, especially in the case where the pressure-on-bit parameters are relatively strengthened. Due to the problem of pressure drop, it is often forced to trip out of the drill, which increases the overall drilling cost

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