Stratified Profile Modification Technologies for High-Temperature Reservoir of Sangonghe Formation in Wellblock Cai-9of Cainan Oilfield

Abstract

Abstract: The Sangonghe reservoir in Wellblock Cai-9has been produced by stratified water injection and internal profile modification to improve the injection profile or waterflooding efficiency due to its uneven injection profile and decreased producing percent. The highintensity and anti-high-temperature phenolaldehyde gel system is used as a profile control agent to investigate the effects of polymer concentration and promoter on gel quality. The results show that the phenolaldehyde gel system features good temperature tolerance, thermal stability and plugging property. Case studies from two wells in Sangonghe reservoir in July 2006showed incremental oil production of 1247t up to July 2007, indicating that this system is effective and feasible to the reservoir.

Key words: Cainan oilfield, Sangonghe reservoir, stratified profile control, profile control agent, cross linking agent, promoter

CLC Number:

TE357.43

GONG Zhao-bo, WANG Yu-qin, FU Guang-hui, ZHOU Hui-ze, YANG Zhao-hui. Stratified Profile Modification Technologies for High-Temperature Reservoir of Sangonghe Formation in Wellblock Cai-9of Cainan Oilfield[J]. Xinjiang Petroleum Geology, 2008, 29(4): 498-499.

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Stratified Profile Modification Technologies for High-Temperature Reservoir of Sangonghe Formation in Wellblock Cai-9of Cainan Oilfield

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