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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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Well Testing Curve Characteristics of Swabbing Well in Fractured Reservoir

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Key Words：Fractured reservoir；Swabbing well；Slug flow；Interporosity flow coefficient；Energy storage ratio

Abstract：The swabbing operation is an effective means for speeding up reservoir development rate and has been widely used in development of oil fields at home and abroad. Pressure curve of each recovery segment in swabbing well implicates a great deal of information and it is necessary to study well test characteristic curves of each recovery segment in swabbing well. At the same time，due to crack existence，crack characteristic parameters have a significant effect on pressure recovery after swabbing. Established is the mathematical model of slug flow in swabbing well in closed circular fractured formation oil reservoir，obtained is well bottom pressure of swabbing well in fractured oil reservoir by using Laplace transform and numerical inversion method and drawn is double logarithm curves of the well bottom pressure of swabbing well in fractured oil reservoir. Results obtained through research on the double logarithm curves show that skin coefficient has effect on the double logarithm curves only in the early stage，fluid channeling in fractured reservoir will result in a step in the double logarithm curves of the swabbing well test. The greater the fluid channeling coefficient，the sooner the step appears，the smaller the energy storage ratio and the more obvious the step.