Mechanical Impact Effects of Fluid Hammer Effects on Drag Reduction of Coiled Tubing

Author:

Liu Yongsheng1,Qin Xing2,Sun Yuchen1,Dou Zijun1,Zhang Jiansong1,Chen Guoqiang1

Affiliation:

1. No.29,xueyuan road,Haidian district,Beijing Beijing, 100083 China

2. North Star Times Building, 8 East North Star Road, Chaoyang, Beijing China 100101 Beijing, Beijing 100101 China

Abstract

Abstract Aiming at the oscillation drag reduction tool that improves the extension limit of coiled tubing downhole operations, the fluid hammer equation of the oscillation drag reducer is established based on the fluid hammer effect. The fluid hammer equation is solved by the asymptotic method, and the distribution of fluid pressure and flow velocity in coiled tubing with oscillation drag reducers is obtained. At the same time, the axial force and radial force of the coiled tubing caused by the fluid hammer oscillator are calculated according to the momentum theorem. The radial force will change the normal contact force of the coiled tubing which has a great influence on frictional drag. The results show that the fluid flow rate and pressure decrease stepwise from the oscillator position to the wellhead position, and the fluid flow rate and pressure will change abruptly during each valve opening and closing time. When the fluid passes through the oscillator, the unit mass fluid will generate an instantaneous axial tension due to the change in the fluid velocity, thereby converting the static friction into dynamic friction, which is conducive to the extend limit of coiled tubing.

Funder

National Natural Science Foundation of China

Publisher

ASME International

Subject

Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment

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