The Mechanisms and Innovative Applications of Over-saturated Particles Well Completion Technique in Limestone Reservoir

doi:10.11885/j.issn.1674-5086.2020.07.15.01

Abstract

Abstract: Liuhua reservoir in the east of South China Sea is a limestone reservoir, with a three-medium porous system, including matrix, fracture and pore. The water cut of oil wells goes up very fast. Various methods have been tried to solve this problem, but few effects have been achieved very. Based on the common particles filling technique, an over-saturated continuous pack-off technique is proposed and three wells have achieved obvious results. The water cut was 30% lower than adjacent wells and goes up much slower, the estimated ultimate recovery is 50 thousand m₃ more than designed. Due to the complexity of the geological and reservoir conditions, the mechanisms of this technique is controversial. This paper, based on the study of fractures, porous flow features, reservoir engineering method, well completion and reservoir simulation, studies the mechanisms of over-saturated particles, which are water control, fracture plug and formation remolding. At early stages, the main mechanism is formation remolding and fracture plug, over-saturated continuous pack-off injection amplifies the micro-fractures and connect the matrix. At later stages, water control is the main mechanism. This study will guide the further application of this technique to limestone reservoir and other bottom-water driven sandstone reservoirs.

Key words: limestone reservoir, triple media, over-saturated particles, fracture plug, formation remolding

CLC Number:

TE34

YANG Yong, LI Feng, ZHANG Wei, XIE Ribin, LI Xiaodong. The Mechanisms and Innovative Applications of Over-saturated Particles Well Completion Technique in Limestone Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(4): 129-138.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.07.15.01

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