Characteristics and influential factors of water cut change in low permeability water-drive oil reservoirs in Shengli oilfield

被引：0

作者：

Wang J. ^{[1
]}

Yu X. ^{[1
]}

Sun Z. ^{[2
]}

Li R. ^{[1
]}

Xu J. ^{[1
]}

机构：

[1] School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, 266580, Shandong

[2] Exploration and Development Research Institute of Shengli Oilfeild Branch Co., Ltd., SINOPEC, Dongying, 257000, Shandong

来源：

Oil and Gas Geology | 2018年 / 39卷 / 04期

关键词：

Bohai Bay Basin; Low permeability reservoir; Stress sensitivity; Water cut; Water-drive oil reservoir; Waterflood efficiency;

D O I：

10.11743/ogg20180420

中图分类号：

学科分类号：

摘要：

The characteristic change of water cut can reflect the effectiveness of waterflooding to some extent.Early water breakthrough, fast water cut rise, and low efficiency of waterflooding have always been the obstacles preventing the development of low permeability reservoirs.Variation of water cut in waterflooding oil reservoirs involves two-phase flow of oil and water in rocks, thus is controlled by petrophysical property, oil-water features and driving force.In regard to the low permeability water-drive oil reservoirs in Shengli oilfield, we analyzed the factors influencing the variation of water cut and waterflood efficiency based on larges amounts of experimental data.These factors are characteristics of reservoir pore structure, original water saturation, stress sensitivity and displacement pressure.The results show that pore connectivity is the major factor for water cut rising, while the initial water cut mainly depends on original water saturation.Appropriate control on displacement pressure is beneficial for controlling water cut and increasing waterflood efficiency.Considering the stress sensitivity of permeability in low permeability reservoirs, we suggested the implementation of advanced water injection to avoid the permeability damage caused by pressure drop, so as to improve waterflood efficiency. © 2018, OIL & GAS GEOLOGY Editorial Board. All right reserved.

引用

页码：833 / 838

页数：5

共 16 条

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