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Research Papers: Petroleum Engineering

Lab Testing and Finite Element Method Simulation of Hole Deflector Performance for Radial Jet Drilling

[+] Author and Article Information
Bin Wang

State Key Laboratory of
Petroleum Resources and Prospecting,
China University of Petroleum Beijing,
Beijing 102249, China
e-mail: binwang.0213@gmail.com

Gensheng Li

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

Zhongwei Huang

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

Tianqi Ma

Department of Mechanics and Engineering Science,
Fudan University,
Shanghai 200000, China
e-mail: mtq1992@126.com

Dongbo Zheng

State Key Laboratory of
Petroleum Resources and Prospecting,
China University of Petroleum Beijing,
Beijing 102249, China
e-mail: 736532480@qq.com

Kui Li

No. 1 Drilling Company,
Sinopec Oilfield Service Jianghan Corporation,
Qianjiang 433123, China
e-mail: 306205543@qq.com

1Corresponding author.

Manuscript received January 26, 2016; final manuscript received December 14, 2016; published online February 6, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 139(3), 032906 (Feb 06, 2017) (10 pages) Paper No: JERT-16-1054; doi: 10.1115/1.4035552 History: Received January 26, 2016; Revised December 14, 2016

Radial jet drilling (RJD) is an efficient approach for improving the productivity of wells in low permeability, marginal and coal-bed methane (CBM) reservoirs at a very low cost. It uses high-pressure water jet to drill lateral holes from a vertical wellbore. The length of the lateral holes is greatly influenced by the frictional resistance in the hole deflector. However, the hole deflector frictional resistance and structure design have not been well studied. This work fills that gap. Frictional resistances were measured in a full-scale experiment and calculated by numerical simulation. The structure of the hole deflector was parameterized and a geometric model was developed to design the hole deflector track. An empirical model was then established to predict the frictional resistance as a function of the hole deflector structure parameters and an optimization method for designing the hole deflector was proposed. Finally, four types of hole deflectors were optimized using this method. The results show good agreement between the numerical simulation and the experimental data. The model error is within 11.6%. The bend radius R and exit angle β are the key factors affecting the performance of the hole deflector. The validation test was conducted for a case hole deflector (5½ in. casing). The measured frictional resistance was decreased from 31.44 N to 23.16 N by 26.34%. The results from this research could serve as a reference for the design of hole deflectors for radial jet drilling.

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References

Figures

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Fig. 1

Radial jet drilling system [13]

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Fig. 2

Casing milling and jet drilling

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Fig. 3

The force analysis of the high-pressure hose in the hole deflector

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Fig. 4

The structure parameters of hole deflector

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Fig. 5

CCD design points at design space (Factors:3)

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Fig. 6

Schematic diagram of radial jet drilling experimental system

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Fig. 7

FEM model of the hole deflector and the high-pressure hose

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Fig. 8

Comparison of the simulated and experimental results in No. 15 deflector

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Fig. 9

Comparison of the simulated and experimental results

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Fig. 10

Response surface diagram for frictional resistance as α and β vary (R = 95 mm)

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Fig. 11

Response surface diagram for frictional resistance as α and R vary (β = 97.5 deg)

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Fig. 12

Response surface diagram for frictional resistance as β and R vary (α = 161.5 deg)

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Fig. 13

Sensitivity analysis for design deflector structure parameters

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Fig. 14

Effect of design parameters on track width

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Fig. 15

Effect of design parameters on track length

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Fig. 16

Hole deflector design flow chart

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Fig. 17

Comparison of original and optimized frictional resistance

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Fig. 18

Stress contour of the high-pressure hose

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Fig. 19

Comparison of hose deformation and contact status between different β (90–105°)

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