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Calculation method of high-speed airflow friction coefficient based on strain

A technology of friction coefficient and high-speed airflow, which is applied in the field of drilling, can solve the problems of many interference factors and lack of gas-wall friction coefficient measurement methods, so as to improve accuracy, avoid the influence of empirical value of pipe wall roughness, Effects of Improving Applicability and Reliability

Active Publication Date: 2019-06-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] The main problems in the prior art: 1) The liquid-wall friction coefficient measurement method is the main method, and the gas-wall friction coefficient measurement method is lacking; 2) The friction coefficient in the calculation of the frictional resistance of the gas flow in the gas well string to the pipe string The value is the liquid-wall friction coefficient or empirical value; 3) There are too many interference factors in the determination of the liquid-wall friction coefficient

Method used

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  • Calculation method of high-speed airflow friction coefficient based on strain
  • Calculation method of high-speed airflow friction coefficient based on strain
  • Calculation method of high-speed airflow friction coefficient based on strain

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0033] The present invention calculates the friction coefficient of the high-speed gas flow in the pipe string based on strain, that is, the present invention is mainly used for the test and calculation of the gas-wall friction coefficient in the pipe string, and the obtained friction coefficient can be further accurate for complex gas wells (three-high gas wells, reservoirs, etc.) Gas storage wells, etc.) in the pipe string to improve the applicability and reliability of the pipe string design.

[0034] The present invention is realized by the following technical solutions:

[0035] 1) Axial strain test of the test tube

[0036] Axial strain gauges are pasted on the outer wall of the test tube, and the axial strain deformation ε of the test tube is measured after the high-pressure airflow i...

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Abstract

The invention discloses a strain-based high-speed air friction coefficient calculation method, which comprises the steps of (1) testing axial strain of a test tube; (2) calculating axial deformation of the test tube; (3) calculating high-speed air friction force; and (4) calculating a friction coefficient, namely calculating the friction force of high-speed air on the inner wall of a tubular column by measuring axial strain deformation of the tubular column with consideration on the influences of inner pressure and section change on axial deformation and further calculating the friction coefficient, thereby improving the design applicability and reliability of the tubular column. The influences of an air flow state change and the roughness of the tube wall do not need to be considered.

Description

technical field [0001] The invention belongs to the technical field of drilling, and relates to a strain-based high-speed airflow friction coefficient calculation method. Background technique [0002] The calculation of the friction effect in the design of the injection-production gas string involves the selection of the friction coefficient. The friction coefficient used in the past is mainly obtained from the liquid flow test or the empirical value, which is lacking in the accurate calculation of the friction resistance under the gas flow. Through a large number of investigations and literature review, it is found that in the field of scientific research and engineering practice, there are few research or test results on the friction resistance of gas well strings under the action of high-speed gas flow. Computational studies of resistance have not yet been carried out. Accurate gas-wall friction coefficient must be obtained on the premise of carrying out these studies, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 王建军杨尚谕薛承文李方坡王鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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