Experimental Methods for Evaluating Productivity Contribution of Different Types of Low Permeability Gas Reservoir

doi:10.11885/j.issn.1674-5086.2012.03.12.03

Abstract

Abstract:

When establishing water saturations in cores，salting-out may occur when using the formation water，and there may be the water/salt sensitivity damages in the process of the deionized water saturation. Those problems bring errors to the experimental results. The present paper provides a method to eliminate the experimental error：by heating the core sample under 550 ℃ for 2 h，passivating the water/salt sensitive clay minerals，and then using the deionized water to build various water saturations during the evaluation experiments，Thus the errors caused by core heterogeneity can be avoided. Besides，the experiment can be proceeded on the same core sample repeatedly. Using this method，we evaluated the productivity contribution rate of the low permeability gas reservoirs of types I，II and III in Member 2 of Xujiahe Formation in Upper Triassic，Hechuan Area，Sichuan Basin. The results show that there is no obvious micro cracks produced after high temperature treatment and the deviation range of permeability is less than 5%.

Key words: low permeability gas reservoirs, productivity, contribution rate, clay mineral passivation, experimental evaluation

Tang Hongming1，2, Feng Yutian2, He Puwei2, Zhang Liehui1, Zhao Feng2. Experimental Methods for Evaluating Productivity Contribution of Different Types of Low Permeability Gas Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.03.12.03.

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