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A method for evaluating the output performance of screw drilling tools under high temperature and high pressure

A screw drilling tool, high temperature and high pressure technology, applied in the field of drilling engineering technology and petroleum drilling engineering, can solve the problem of difficulty in actual evaluation of output performance, etc.

Inactive Publication Date: 2020-10-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Application Information

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Problems solved by technology

[0006] However, in the actual engineering application of screw drilling tools, due to the limitation of deep well detection technology, it is difficult to evaluate the output performance under high temperature and high pressure.

Method used

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  • A method for evaluating the output performance of screw drilling tools under high temperature and high pressure
  • A method for evaluating the output performance of screw drilling tools under high temperature and high pressure
  • A method for evaluating the output performance of screw drilling tools under high temperature and high pressure

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Embodiment Construction

[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0059] Next, an example calculation is performed in conjunction with a domestic brand of multi-head screw drilling tools. The structural parameters of the screw motor are shown in Table 1.

[0060] Table 1 Screw Motor Parameters

[0061]

[0062] The plastic viscosity of the drilling fluid is 15mPa·s, the friction coefficient between the rotor and the stator of the screw motor is 0.1, the material of the rotor of the screw motor is 45# steel, the density is 7850kg / m3, the Poisson’s ratio is 0.25, and the modulus of elasticity is 206000MPa. It is nitrile rubber with Shore hardness of 80, Poisson's ratio is 0.49, elastic modulus is 10.98MPa, and linear expansion coefficient is 196×10 -6 .

[0063] Assuming that the well depth of a given screw drilling...

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Abstract

The invention discloses a method for evaluating the output performance of a screw drill in a high-temperature and high-pressure state. The invention relates to the technical field of drilling engineering and petroleum drilling engineering. The problem that the output performance of a screw drill is difficult to evaluate in a deep well high-temperature and high-pressure environment is solved. The method comprises: establishing a screw drill output performance parameter theoretical model, coupling strain generated by temperature and pressure with a theoretical model, quantitatively determining the influence of the temperature strain and the pressure strain on the output performance parameters of the screw drill, obtaining an actual output torque and an actual output speed of the screw drilling tool under high temperature and high pressure, and evaluating the output performance of the screw drilling tool in a high temperature and high pressure environment based on this. According to the method provided by the invention, the calculation steps are simple and convenient, the application range is wide, and the method can be used for reference of on-site engineering personnel, manufacturers and researchers.

Description

technical field [0001] The invention relates to the fields of drilling engineering technology and petroleum drilling engineering technology, in particular to a method for evaluating the output performance of a screw drilling tool under high temperature and high pressure. Background technique [0002] The screw drilling tool is a volumetric downhole dynamic drilling tool powered by drilling fluid. When working, the drilling fluid enters the screw drilling tool bypass valve assembly from the drill pipe, closes the valve core, and then enters the motor assembly. A certain pressure difference is formed at the inlet and outlet of the motor to drive the rotor of the motor to rotate, generating torque and speed. It is transmitted to the drill bit through the cardan shaft assembly and the transmission shaft assembly to achieve the purpose of drilling. [0003] In recent years, the development of the drilling field to the deep is a major trend. In the field of oil and gas well dril...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00G01L3/26
CPCG01L3/26G01M99/007
Inventor 徐珺吴翔陆洪智郁桂刚
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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