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research-article

Numerical Simulation and Experimental Study of Cuttings Transport in Narrow Annulus

[+] Author and Article Information
Shi Huaizhong

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
shz@cup.edu.cn

Zhao Heqian

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
2017312014@student.cup.edu.cn

Ji Zhaosheng

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
2017312028@student.cup.edu.cn

Li Jingbin

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
lijingbin555@hotmail.com

Hou Xinxu

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
1043110710@qq.com

Zhou Shijie

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, 18 Fuxue Road, Changping District, Beijing, China
1278249728@qq.com

1Corresponding author.

ASME doi:10.1115/1.4042448 History: Received June 12, 2018; Revised December 31, 2018

Abstract

With the development of petroleum industry, it needs an efficient drill method such as under balanced drilling (UBD) to enhance the rate of penetrate (ROP). However, borehole instability is a problem that must be faced in UBD. The coiled tubing partial underbalanced drilling has been proposed to try to solve this problem while keeping an underbalanced condition with high rate of penetration (ROP). This paper analyzes the laws of cuttings transport in the narrow annulus focus on this new technique through the simulations and experiments. From the results of simulations, it obtains that the particle velocity declines with the increase of rotational speed and increases with the increase of flow rate. The particles become concentrated as the flow rate increases and the high flow rate limits particles in a small area. The particle distribution undergoes a process of concentration, dispersion, and concentration as the rotational speed increases. The high rotational speed makes particles deviate from the high fluid velocity area, which causes low particle velocity. The relationships between particle velocity and rotational speed and between particle velocity and flow rate are fitted through the equations respectively. The phenomenons of collision of particles, sinking and rising of particles and variation of particle velocity are observed in the experiments. The particle velocity of experiments. The error between the particle velocity in the experiment and numerical simulation is less than 8.5%. This paper is an exploratory study conducted for the cuttings transport in narrow annulus.

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