Characteristics of Preferential Migration Pathway of Polymer Flooding in Conglomerate Reservoirs and Its Effects on Remaining Oil

doi:10.3969/j.issn.1006-6535.2021.04.015

Abstract

Abstract: To address the problem of high water cut increasing rate and high fluid production rate in the conglomerate reservoir of Kexia Formation of QD1 reservoir, grid simulation with Rdos software and Eclipse chemical flooding simulation were conducted to characterize the preferential migration conduit and its relationship with remaining oil distribution in different stages of polymer flooding. The results show that the preferential migration conduit in Kexia Formation of QD1 reservoir was divided into two types. In the four stages of polymer flooding, 6 and 17 Type I conduits were developed in the front water flooding stage and the return regression stage respectively, and were concentrated in horizontal fractures and the relative-high-permeability area of the reservoir; Type II conduits were mainly developed in the near east-west direction in the effective peak period and the stable production period of polymer flooding; preferential migration conduit was an important factor to control the distribution of remaining oil in conglomerate reservoir of Kexia Formation; the remaining oil in the east of the study area was distributed in preferential migration conduit in the shape of bird foot and island; with the expansion of water flooding range, the remaining oil was reduced into clumps and spots, while the remaining oil in the west was distributed in a strop or line shape near the fault. This study provides a basis for the design of plugging measures for preferential migration conduit in QD1 oilfield and the improvement of the polymer flooding effect in conglomerate reservoir.

Key words: Rdos simulation, polymer flooding, conglomerate reservoir, preferential migration conduit, QD1 reservoir

CLC Number:

TE349

Bai Lei, Sun Pengchao, Hu Xiaodie, Wan Qingshan. Characteristics of Preferential Migration Pathway of Polymer Flooding in Conglomerate Reservoirs and Its Effects on Remaining Oil[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 108-115.

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