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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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Methods for Fracturing Effect Improvement in Liumao Tableland Long 8 Reservoir

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Key Words： New depressurization and injection-adding agent； Insufficent injection lack mechanism； Field test； Fracturing effect

Abstract：ABSTRACT： Jiyuan Oilfield Liumao Tableland Long 8 Reservoir is a typical ultra-low permeability reservoir and its block average permeability is less than 0.3mD. The block was developed with water injection from 2009 and water injection pressure at the initial stage was more than 20MPa. Injection allocation requirements could not be reached in some of water injection wells for a long time and there still was lack of water injection after adopting decompression and augmented injection measures，such as fracturing，acidizing，etc. In order to solve this situation，researches on a new type of decompression and augmented injection agent was carried out from then on. Analyzed is the insufficient injection mechanism under high pressure on the basis of relevant laboratory experiment and results show that reasons of insufficient injection are poor reservoir physical property，low permeability，strong water sensitivity effect between injected water and reservoir，Jamin effect in injected water and incompatibility between injected water and reservoir water. Developed is the new decompression and augmented injection agent with acidity，viscosity reduction，anti-swelling property，scale prevention and scale removal capacity according to insufficient injection causes. Field test results show that such agent has good effects.