Channeling Characteristics and Profile Modification Measures for Polymer Flooding in Conglomerate Reservoirs in Xinjiang Oilfield

doi:10.11885/j.issn.1674-5086.2018.07.11.01

Abstract

Abstract: Polymer flooding channeling is an important factor affecting polymer flooding. Targeting the complex mode pore structure, which is special to the conglomerate reservoirs in Qidong-1 Area, crossflow characteristics and profile modification measures of polymer flooding were studied through physical simulation experiments conducted indoors in parallel with those at the rock cores. The study shows that, when the permeability variation coefficient of the conglomerate reservoirs is less than 0.3, no crossflow occurs in polymer flooding; when it is larger than 0.5, the effect of profile improvement by the polymer is limited, and channeling occur, which lead to a rapid rebound in water content of highly permeable cores after polymer flooding takes effect. As the permeability variation coefficient increases, the time taken for the polymer to break through the highly permeable layer is shortened, channeling occur earlier and more severely, and subsequently, the percentage of liquid absorption in the highly permeable layer is increased from 52% to 75%. With timely profile modification after channeling, channeling can be effectively controlled while polymer flooding takes effect, increasing the recovery rate by 28.75%.

Key words: conglomerate reservoir, polymer flooding, characteristics of polymer channeling, strong reservoir heterogeneity, profile control

CLC Number:

TE34

TANG Ke, JI Ping, WANG Xuehua, LUO Qiang. Channeling Characteristics and Profile Modification Measures for Polymer Flooding in Conglomerate Reservoirs in Xinjiang Oilfield[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 105-111.

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