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Research Papers: Petroleum Wells-Drilling/Production/Construction

Numerical and Experimental Investigation on the Feasibility of Horizontal Drilling With a New Type of Jet Mill Bit

[+] Author and Article Information
Tong Cao

College of Mechanical and Transportation Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: cupbj@foxmail.com

Kaian Yu

College of Mechanical and Transportation Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: kaianyu@163.com

Xuyue Chen

MOE Key Laboratory of Petroleum Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: chenxuyue2011@163.com

Deli Gao

MOE Key Laboratory of Petroleum Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: gaodeli@cup.edu.cn

Hongwu Zhu

College of Mechanical and Transportation Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: zhuhw@cup.edu.cn

YunQing Luo

College of Mechanical and Transportation Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: 904487147@qq.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received October 21, 2018; final manuscript received March 15, 2019; published online April 4, 2019. Assoc. Editor: Gensheng Li.

J. Energy Resour. Technol 141(9), 093101 (Apr 04, 2019) (9 pages) Paper No: JERT-18-1794; doi: 10.1115/1.4043246 History: Received October 21, 2018; Accepted March 16, 2019

Recently, a new type of jet mill bit (JMB) has been introduced to improve the cutting transport efficiency in horizontal drilling by comminuting cuttings into dust-like particles immediately after the cuttings are generated. To promote the application of JMBs in the field, in this work, JMBs were further improved by including junk slots (JS) all around to allow cuttings to flow through the annulus and thereby prevent sticking from occurring while tripping out. Moreover, numerical and experimental investigations on the feasibility of horizontal drilling with the new type of JMB were carried out. The finite element method was used to analyze the strength of the new type of JMB, and flow field simulation analysis was also performed for JMBs with different sizes of JS. The simulation results indicated that the weakest point of the JMB was located at the bit connection instead of the bit frame, and it was demonstrated that the structural strength of the JMB met the requirements of actual working conditions. The JMB JS had a negative effect on promoting the upward return of cuttings from the bottom of the hole, and the larger the slot sizes were, the more negative the effects. Through a trip-out experiment with the new type of JMB, this paper studied the influence of the slot size on the trip-out process safety. The experimental results indicated that the minimum safe slot width was 60 mm. Finally, in a synthesis of the simulation and experimental results, the reasonable range of slot width was determined to be 60–70 mm; the aforementioned range was the most suitable for the bit based on safety and efficiency considerations. This paper provides guidance for the improvement and application of JMBs.

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Figures

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Fig. 1

Schematic of the jet mill bit design

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Fig. 2

Jet mill bit with junk slots

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Fig. 4

The loads on the JMB

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Fig. 5

Grid independence test results

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Fig. 6

Jet mill bit static simulation results: (a) deformation diagram and (b) stress diagram

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Fig. 7

Jet mill bit crown: (a) JMB crown model and (b) JMB crown dimension drawing

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Fig. 8

The fluid domain mesh

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Fig. 9

Grid independence test results

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Fig. 10

Drilling fluid discharge velocity cloud: (a) L = 0 mm, (b) L = 30 mm, (c) L = 40 mm, (d) L = 50 mm, (e) L = 60 mm, and (f) L = 70 mm

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Fig. 11

Curves of JMB outlet flow rates in proportion to the inlet flow rate

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Fig. 12

Simulated trip-out experiment with jet mill bit

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Fig. 13

Pictures of the experimental materials: (a) nylon model of a JMB, (b) cuttings, and (c) piston

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Fig. 14

Simulated trip-out experimental device

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Fig. 15

Experimental JMB models with different sizes of JS

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Fig. 16

Experimental pictures of the simulated trip-out

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