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Research Papers: Petroleum Engineering

Influence of Oriented Perforation Design on Refracture Reorientation: Simulation and Experiment

[+] Author and Article Information
Minhui Qi

College of Petroleum Engineering,
China University of Petroleum,
No.66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: tsihui@foxmail.com

Mingzhong Li

College of Petroleum Engineering,
China University of Petroleum,
No.66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: limingzhong_upc@hotmail.com

Tiankui Guo

College of Petroleum Engineering,
China University of Petroleum,
No.66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: guotiankui@126.com

Chunting Liu

College of Petroleum Engineering,
China University of Petroleum,
No.66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: Liuct.1990@163.com

Song Gao

Haimo America, Inc,
2901 Wilcrest Drive,
Houston, TX 77042
e-mail: songgao66@gmail.com

Shukai Tang

College of Petroleum Engineering,
China University of Petroleum,
No.66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: kennytown@139.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 3, 2017; final manuscript received March 11, 2018; published online April 13, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 140(8), 082903 (Apr 13, 2018) (9 pages) Paper No: JERT-17-1614; doi: 10.1115/1.4039742 History: Received November 03, 2017; Revised March 11, 2018

The oriented perforating is the essential technique to guide the refracture reorientation, but the influence of the oriented perforation design on the refracture steering radius is still unclear. In this paper, the factors influencing the refracture reorientation were studied by simulation models and experiments. The effects of initial fracture, well production, and perforations on the refracture initiation and propagation were analyzed. Three-dimensional finite element models were conducted to quantify the impact of perforation depth, density, and azimuth on the refracture. The large-scale three-axis hydraulic fracturing experiments guided by oriented perforations were also carried out to verify the fracture initiation position and propagation pattern of the simulation results. The research results showed that perforations change the near-wellbore induced stress distribution, thus changing the steering radius of the refracture. According to the simulation results, the oriented perforation design has a significant influence on the perforation guidance effect and refracture characteristics. Five hydraulic fracturing experiments proved the influence of perforating parameters on fracture initiation and morphology, which have a right consistency between the simulation results. This paper presents a numerical simulation method for evaluating the influence of the refracture reorientation characteristics under the consideration of multiple prerefracturing induced-stress and put forward the oriented perforation field design suggestions according to the study results.

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Figures

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Fig. 1

Schematic of induced stress field

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Fig. 2

Geometric model and meshing

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Fig. 3

Stress distribution figure nearby the wellbore

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Fig. 4

Refracture propagation pattern: (a) without the guidance of oriented perforations and (b) with the guidance of oriented perforations

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Fig. 5

Maximum principal stress orientation distribution and refracture propagation pattern influenced by (a) perforation density, (b) perforation depth, and (c) perforation azimuth

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Fig. 6

(a) Refracturing steering radius influenced by perforation density, (b) refracturing steering radius and the relative steering radius influenced by perforation length, and (c) refracturing steering radius influenced by perforation azimuth

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Fig. 7

Stress distribution in the vertical direction with different perforation density: (a) six perforations per meter, (b) ten perforations per meter, and (c) twelve perforations per meter

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Fig. 8

The true three-axis hydraulic fracturing experimental equipment used in these experiments

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Fig. 9

The hydraulic fracturing experimental results

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Fig. 10

Numerical validating of specimen 1#, (a) geometric model and (b) maximum principal stress orientation pattern

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