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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Application of Deep Acid Fracturing Technology in Northeastern Sichuan Carbonate Reservoir

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Key Words：Northeastern area of Sichuan； Carbonate； Depth； Acid fracture； Acid liquor； Process

Abstract： Carbonate reservoir in northeastern area of Sichuan has such characteristics as large burial depth， high densification degree， high bursting pressure and formation temperature， high construction friction， developed tiny cracks， high construction pressure of acidification fracturing， large acid filtration， rapid speed of acid etching and acid rock reaction， short action distance of acid dissolution， serious string corrosion， low reservoir transformation degree and poor stimulation effect of conventional acid fracture modification. A large number of field application test results show that application of such deep acid fracturing processes as gel acid， thermal control sticky acid system， ahead fluid plus gel acid and multilevel alternating injection plus closed acid fracturing can reduce strata filtration loss effectively， delay the speed of acid dissolution and acid rock reaction， reduce string corrosion， lengthen the action distance of acid dissolution and improve acid corrosion fracture flow capacity and gas increasing and stabilizing production effects significantly.