Discussion on optimal injection pressure of fractured low-permeability sandstone reservoirs-A case study from Wangyao block in Ansai oilfield, Ordos Basin

被引：0

作者：

Zhao, Xiangyuan ^{[1
]}

Zeng, Lianbo ^{[1
]}

Jin, Baoguang ^{[2
]}

Jiao, Jun ^{[3
]}

Li, Peihai ^{[4
]}

Zhang, Yangyu ^{[5
]}

Chen, Minzheng ^{[6
]}

机构：

[1] College of Geoscience, China University of Petroleum (Beijing), Beijing

[2] Geoscience Center, CNPC Greatwall Drilling Company, Beijing

[3] Exploration and Development Research Institute of Changqing Oilfield Company, PetroChina, Xi'an, 710018, Shaanxi

[4] BGP INC. CNPC, Panjin, 124010, Liaoning

[5] Research Center, CNOOC, Beijing

[6] Research Institute of Shenzhen Branch Company, CNOOC, Guangzhou, 510240, Guangdong

来源：

Oil and Gas Geology | 2015年 / 36卷 / 05期

关键词：

Formation fracture pressure; Fracture opening pressure; Low-permeability reservoir; Natural fracture; Ordos Basin; Water injection pressure;

D O I：

10.11743/ogg20150519

中图分类号：

学科分类号：

摘要：

Analog outcrop, core and well logging data are integrated in this paper to calculate opening pressure of fractures and formation fracture pressure in different reservoir intervals and analyzed various factors affecting opening pressure of fractures based on evaluation of natural fracture characteristics. A sensitivity analysis was performed to determine proper injection pressure for low-permeability reservoirs. High dip-angle fractures are predominant in Chang-6 reservoir in Wangyao block in Ansai oilfield, and their main orientations are NEE-SWW, E-W, S-N and NW-SE, respectively. The opening pressures vary significantly in different reservoir intervals due to the control of buried depth, fracture orientation, pore fluid pressure and current geo-stress. The reasonable injection pressure should be determined by the maturity of local natural fractures accordingly. In areas with few natural fractures, water injection pressure should not be larger than formation fracture pressure, so as to avoid large-scale fracturing that leads to water breakthough. In areas with dense fractures, if the fracture opening pressure is less than the formation fracture pressure, the rational injection pressure should be set less than the formation fracture pressure to avoid large-scale opening and connection of natural fractures; otherwise the injection pressure should be properly set according to the formation fracture pressure to avoid new large-scale fracturing. ©, 2015, Editorial Office of Oil and Gas Geology. All right reserved.

引用

页码：855 / 861

页数：6

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