致密油大规模多段压裂水平试井解释及外区渗透率对试井曲线的影响

李道伦; 杨景海; 闫术; 查文舒; 卢德唐; 曾亿山

doi:10.3799/dqkx.2017.556

Volume 42 Issue 8

Aug. 2017

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Article Navigation > Earth Science > 2017 > 42(8): 1324-1332

Li Daolun, Yang Jinghai, Yan Shu, Zha Wenshu, Lu Detang, Zeng Yishan, 2017. Numerical Well Test Interpretation of Massive Multistage Fractured Horizontal Wells in Tight Oil Reservoirs and Effect of Permeability of Exterior Region on Well Test Curves. Earth Science, 42(8): 1324-1332. doi: 10.3799/dqkx.2017.556

Citation:

Li Daolun, Yang Jinghai, Yan Shu, Zha Wenshu, Lu Detang, Zeng Yishan, 2017. Numerical Well Test Interpretation of Massive Multistage Fractured Horizontal Wells in Tight Oil Reservoirs and Effect of Permeability of Exterior Region on Well Test Curves. Earth Science, 42(8): 1324-1332. doi: 10.3799/dqkx.2017.556

Citation:

Li Daolun, Yang Jinghai, Yan Shu, Zha Wenshu, Lu Detang, Zeng Yishan, 2017. Numerical Well Test Interpretation of Massive Multistage Fractured Horizontal Wells in Tight Oil Reservoirs and Effect of Permeability of Exterior Region on Well Test Curves. Earth Science, 42(8): 1324-1332. doi: 10.3799/dqkx.2017.556

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Numerical Well Test Interpretation of Massive Multistage Fractured Horizontal Wells in Tight Oil Reservoirs and Effect of Permeability of Exterior Region on Well Test Curves

doi: 10.3799/dqkx.2017.556

1.
School of Mathematics, Hefei University of Technology, Hefei 230009, China
2.
Logging and Testing Services Company, Daqing Oilfield Company, PetroChina, Daqing 163453, China
3.
School of Engineering Science, University of Science and Technology of China, Hefei 230026, China

Received Date: 2017-01-03
Publish Date: 2017-08-15

Abstract

Abstract

Numerical well test interpretation of massive multistage fractured horizontal wells can be used for the fracturing effect evaluation, which is very important for productivity evaluation. However, few field case studies have been conducted. Numerical solution of oil-water two-phase flow based on PEBI grid and description of stimulated reservoir volume (SRV) by main fractures with infinite conductivity and improved permeability of the region with minor fractures are used in combination to interpret the transient pressure of massive multistage fractured horizontal wells in tight oil reservoirs in Daqing oilfield. The interpretation and sensitivity analysis of permeability of exterior region show that the value of pressure derivative becomes smaller at early time and becomes larger at late time when the permeability of exterior region decreases, compared with pressure derivative without permeability modification, which indicates a turning point on the curves of pressure derivative. Prior to the turning point, the pressure derivative with smaller permeability in exterior region is relatively smaller, while after the point, the pressure derivative is larger. The time of appearance of the turning point is related to the magnitude of permeability between those of exterior and interior regions. Therefore, when good fitting of pressure derivative curves achieves at early time and bad fitting of pressure derivative curves at late time, adjustment of permeability of exterior region cannot wholly improve the fitting effect, and other parameters need to be adjusted to improve the fitting. This study can facilitate future transient pressure analysis for massive multistage fractured horizontal wells in tight oil reservoirs.
- multistage fractured horizontal well,
- stimulated reservoir volume,
- fracture half length,
- perpendicular bisector grid,
- numerical solution,
- oil-water two-phase,
- petroleum geology

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References(36)

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Numerical Well Test Interpretation of Massive Multistage Fractured Horizontal Wells in Tight Oil Reservoirs and Effect of Permeability of Exterior Region on Well Test Curves

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