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Research Papers: Petroleum Engineering

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 102249, China
e-mail: 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 102249, China
e-mail: 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 102249, China
e-mail: 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 102249, China
e-mail: Lijingbin555@hotmail.com

Hou Xinxu

State Key Laboratory of Petroleum
Resources and Prospecting,
China University of Petroleum Beijing,
18 Fuxue Road, Changping District,
Beijing 102249, China
e-mail: 1043110710@qq.com

Zhou Shijie

State Key Laboratory of Petroleum
Resources and Prospecting,
China University of Petroleum Beijing,
18 Fuxue Road, Changping District,
Beijing 102249, China
e-mail: 1278249728@qq.com

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 12, 2018; final manuscript received December 31, 2018; published online January 30, 2019. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 141(8), 082902 (Jan 30, 2019) (9 pages) Paper No: JERT-18-1427; doi: 10.1115/1.4042448 History: Received June 12, 2018; Revised December 31, 2018

With the development of petroleum industry, it needs an efficient drill method such as under balanced drilling (UBD) to enhance the rate of penetration (ROP). However, borehole instability is a problem that UBD must face. The coiled tubing partial underbalanced drilling (CT-PUBD) is proposed to try to solve this problem while keeping an underbalanced condition with high 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 phenomenon of collision of particles, sinking and rising of particles, and variation of particle velocity are observed in the 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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Figures

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Fig. 1

Coiled tubing partial underbalanced drilling schematic diagram (a) diagram of CT-PUBD and (b) backflow controller

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Fig. 2

Drilling fluid circulation process and working principle of the packer (left: packer sealing status and right: packer unsealing status)

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Fig. 3

Geometric model and boundary condition

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Fig. 4

Grid-independent analysis

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Fig. 5

Particle velocity varies with rotational speed

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Fig. 6

Particle velocity varies with flow rate

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Fig. 7

The distribution of radial velocity of particles under the rational speed of 0 rpm

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Fig. 8

Radial velocity distribution of under the fluid velocity of 1.0 m/s and normalized velocity distribution of fluid under 0 rpm

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Fig. 9

Flow chart of the experimental procedure

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Fig. 10

Aluminum balls in the experiment

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Fig. 11

Experimental phenomena: (a) sinking of particles (rotational speed: 55 rpm, time interval: 0.11 s), (b) collision of particles (rotational speed: 0 rpm, time interval: 0.048 s), and (c) change of particles z velocity (rotational speed: 133 rpm, time interval: 0.07 s)

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Fig. 12

Distribution of particles at 10 s in the simulations

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Fig. 13

Comparison of experiment and simulation

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