胜利油田低渗透水驱油藏含水变化特征及影响因素

doi:10.11743/ogg20180420

Abstract

Abstract: 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.

Key words: water cut, waterflood efficiency, stress sensitivity, low permeability reservoir, water-drive oil reservoir, Bohai Bay Basin

CLC Number:

TE348

Wang Jianzhong, Yu Xinchang, Sun Zhigang, Li Rongqiang, Xu Jinjie. Characteristics and influential factors of water cut change in low permeability water-drive oil reservoirs in Shengli oilfield[J]. Oil & Gas Geology, 2018, 39(4): 833-838.

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

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