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Research Papers: Petroleum Wells-Drilling/Production/Construction

Pressure-Transient Behavior of Multisegment Horizontal Wells With Nonuniform Production: Theory and Case Study

[+] Author and Article Information
Youwei He

State Key Laboratory of Petroleum Resources
and Prospecting,
China University of Petroleum,
Beijing 102249, China;
Harold Vance Department of Petroleum Engineering,
Texas A&M University,
College Station, TX 77843

Shiqing Cheng

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

Jiazheng Qin, Zhiming Chen, Haiyang Yu

State Key Laboratory of Petroleum Resources
and Prospecting,
China University of Petroleum,
Beijing 102249, China

Yang Wang

State Key Laboratory of Petroleum Resources
and Prospecting,
China University of Petroleum,
Beijing 102249, China;
Department of Energy and Mineral Engineering,
The Pennsylvania State University,
University Park, PA 16802

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 7, 2018; final manuscript received March 24, 2018; published online April 19, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 140(9), 093101 (Apr 19, 2018) (9 pages) Paper No: JERT-18-1024; doi: 10.1115/1.4039875 History: Received January 07, 2018; Revised March 24, 2018

Field data indicate production profile along horizontal wells is nonuniform. This paper develops an analytical model of multisegment horizontal wells (MSHWs) to estimate rate distribution along horizontal wellbore, interpret the effective producing length (EPL), and identify underperforming horizontal sections using bottom-hole pressure (BHP) data. Pressure solutions enable to model an MSHW with nonuniform distribution of length, spacing, rate, and skin factor. The solution is verified with the analytical solution in commercial software. Type curves are generated to analyze the pressure-transient behavior. The second radial-flow (SRF) occurs for the MSHWs, and the duration of SRF depends on interference between segments. The pressure-derivative curve during SRF equals to 0.5/Np (Np denotes the number of mainly producing segments (PS)) under weak interference between segments. The calculated average permeability may be Np times lower than accurate value when the SRF is misinterpreted as pseudoradial-flow regime. The point (0, 0, h/2) are selected as the reference point, and symmetrical cases will generate different results, enabling us to distinguish them. Finally, field application indicates the potential practical application to identify the underperforming horizontal segments.

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Figures

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Fig. 2

Comparison between the model in this paper and the analytical solution in Saphir

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Fig. 3

Type curves of (a) the PTA model of an MSHW and (b) a horizontal well with two segments and entire segment

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Fig. 4

The schematic of the reference point for a horizontal well

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Fig. 5

Comparison of type curves of an MSHW with different reference points

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Fig. 6

The effect of different segments spacing on pressure-transient behavior

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Fig. 7

The effect of number of segments on pressure-transient behavior

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Fig. 8

The effect of length of two segments on pressure-transient behavior

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Fig. 9

The effect of length of three segments on pressure response under nonuniform production distribution

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Fig. 10

Type curves of MSHW with symmetrical length distribution with reference point: (a) (0.5L, 0, h/2) and (b) (0, 0, h/2)

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Fig. 11

The effect of production of segments on pressure response when reference point of pressure calculation is at: (a) point (0, 0, h/2) and (b) point (0.5L, 0, h/2)

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Fig. 12

The effect of skin factor of segments on type curves with different reference point: (a) (0, 0, h/2) and (b) (0.5L, 0, h/2)

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Fig. 13

The diagram of the history-matching algorithm

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Fig. 14

Interpretation of well #A using the proposed approach

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