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Research Papers: Petroleum Engineering

Numerical Study of a Flow Field Near the Bit for a Coiled-Tubing Partial Underbalanced Drilling Method

[+] Author and Article Information
Huaizhong Shi

State Key Laboratory of Petroleum Resources and Prospecting,
China University of Petroleum (Beijing),
Beijing 102249, China
e-mail: shz@cup.edu.cn

Hengyu Song

State Key Laboratory of Petroleum Resources and Prospecting,
China University of Petroleum (Beijing),
Beijing 102249, China
e-mail: 2017312022@student.cup.edu.cn

Heqian Zhao

State Key Laboratory of Petroleum Resources and Prospecting,
China University of Petroleum (Beijing),
Beijing 102249, China
e-mail: 2017312014@student.cup.edu.cn

Zhenliang Chen

State Key Laboratory of Petroleum Resources and Prospecting,
China University of Petroleum (Beijing),
Beijing 102249, China
e-mail: 1057092080@qq.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received June 22, 2018; final manuscript received March 28, 2019; published online April 17, 2019. Assoc. Editor: Fanhua Zeng.

J. Energy Resour. Technol 141(10), 102902 (Apr 17, 2019) (11 pages) Paper No: JERT-18-1451; doi: 10.1115/1.4043388 History: Received June 22, 2018; Accepted March 28, 2019

A new drilling method called coiled-tubing partial underbalanced drilling (CT-PUBD) was proposed in this paper. The method is not only able to enhance rate of penetration (ROP) just like the conventional underbalanced drilling technology but can also maintain borehole stability in the upper formation. In the new method, the wellbore pressure system is divided into two parts by a packer: (1) normal pressure system in the upper formation used to balance formation pressure and maintain borehole stability and (2) an underbalanced pressure system in the annulus near the bit used to enhance ROP. Because the pressure system and the circulation system are different, the cuttings transportation process of the method is different from the conventional way. Therefore, it is essential to study how to carry cuttings away efficiently. The flow field and cuttings distribution in the annulus near the bit were analyzed by computational fluid dynamic (CFD) methods. Cuttings transportation trajectory, velocity distribution, and cuttings concentration distribution were obtained under different holes’ parameters of the backflow device (including holes number, diameter, distance, and angle) and different drilling fluid viscosities. The results show that these parameters all have influence on cuttings carrying efficiency, and the most influential parameters are viscosity, angle, and diameter. According to the result of an orthogonal test, a suitable combination of the holes’ parameters was obtained. In the combination, the value of holes number, diameter, distance, and angle is 4, 50 mm, 300 mm, and 120 deg, respectively. This paper provides a theoretical basis for an optimization design of the new method.

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Figures

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Fig. 1

Schematic of partial underbalanced drilling using coiled tubing (left: wellhead device schematic; right: downhole device schematic)

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Fig. 2

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

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Fig. 3

Geometric model of simulation

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Fig. 4

Streamline of the drilling fluid (left) and cuttings trajectory (right) in the annulus near the bit (after stabilization)

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Fig. 5

Cuttings distribution in the annulus near the bit at different time points

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Fig. 6

Relationship between the total mass of cuttings in the annulus near the bit and time

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Fig. 7

Cuttings velocity distribution along the axial direction

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Fig. 8

The cuttings trajectory in the annulus near the bit in conditions of a different holes number (particles represent the cuttings and the legend on the left represents velocity of the cuttings)

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Fig. 9

The mass concentration distribution of cuttings in the annulus near the bit in conditions of a different holes number

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Fig. 10

The cuttings trajectory in the annulus near the bit in conditions of a different holes diameter (the legend on the left represents velocity of the cuttings)

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Fig. 11

The mass concentration distribution of cuttings in the annulus near the bit in conditions of a different holes diameter

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Fig. 12

The cuttings trajectory in the annulus near the bit in conditions of a different holes distance (the legend on the left represents the velocity of cuttings)

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Fig. 13

The mass concentration distribution of cuttings in the annulus near the bit in conditions of a different holes distance

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Fig. 14

The cuttings trajectory in the annulus near the bit in conditions of a different holes angle (the legend on the left represents velocity of the cuttings)

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Fig. 15

The mass concentration distribution of cuttings in the annulus near the bit in conditions of a different holes angle

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Fig. 16

The cuttings trajectory in the annulus near the bit in conditions of different viscosities of the drilling fluid (the legend on the left represents velocity of the cuttings)

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Fig. 17

The mass concentration distribution of cuttings in the annulus near the bit in conditions of different viscosities

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