Research and Application of Profile Control System for Buried Hill Fractured Reservoirs in Bohai Oilfield

Changting Pang; Yanyue Li; Wenbo Bao; Jinlong Lv; Hui Li

doi:10.54097/jge0kd72

Authors

Changting Pang
Yanyue Li
Wenbo Bao
Jinlong Lv
Hui Li

DOI:

https://doi.org/10.54097/jge0kd72

Keywords:

Bohai oilfield; fracture; buried hill reservoir; profile control.

Abstract

In order to solve the problem of continuous deterioration of water injection effect in Bohai buried-hill fractured reservoirs, a temperature-resistant profile control system for controlling fractures was developed. Through the selection of polymer, crosslinking agent and crosslinking agent, the profile control system with the formula of 3000-4000mg/L polymer+ 3000mg/L crosslinking agent+2500mg/L crosslinking agent is optimized. Indoor evaluation experiments show that the gelling time of the profile control system is more than 65 hours, the strength is more than F level, no obvious dehydration occurs after aging for 60 days at high temperature, the plugging rate of the fractured core reaches more than 99%, the matrix remaining oil can be started, and the recovery factor is increased by 27.20%. Field application shows that the profile control system has successfully blocked the water channeling fractures between oil and water wells, the maximum water cut reduction is 45%, and the oil increase effect is remarkable.

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