Mechanism and Control Methods of the Working Fluid Damages in
Fractured Tight Reservoirs

doi:10.11885/j.issn.1674-5086.2015.03.16.04

Abstract

Abstract:

Fractured tight gas reservoirs is characteristic of developed natural fractures which lead to lost circulation of working
fluid and induce formation damage. In order to study the damage mechanism of working fluids indifferent operations and to find
out prevention strategies，based on the Xujiahe formation and Zhenzhuchong formation in the Jiulongshan Structure in western
Sichuan Basin which is a fractured tight gas reservoir，we carried out the damage evaluation experiments of drill-in fluid and
the working fluids order contact. The experimental results show that the damage grades of blocks induced by the filtrate of
drill-in fluid，the drill-in fluid and the drill-in fluid solids range from medium to intensely and reduce gradually；the average
permeability dynamic damage grade of the fractured samples is intense；the working fluid order contact would strengthen the
damage degree. The analysis of the damage mechanism of different operations shows that water phase trapping，solid plugging
are the major mechanism of working fluids damage；the damage induced by different working fluid would be superimposed，
and increased the damage range. Based on the results，we constructed the damage patterns of lost circulation，and suggest using
the modified shielding plugging drill-in fluid to improve sealing ability and change the rock wettability can prevent the working
fluid damage effectively. Identification of damage range with lost circulation data can provide guidance for acidizing.

Key words: fractured tight reservoirs, working fluid, lost circulation, reservoir damage, control methods

Kang Yili1*, Zhang Dujie1, You Lijun1, Xu Chengyuan1, Yu Haifeng2. Mechanism and Control Methods of the Working Fluid Damages in
Fractured Tight Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.16.04.

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