马寨油田注入水水体改性前后地层情况变化

为了探索１９９５年马寨油田注入水水体改性工程完成后，弱碱性注入水对地层造成的影响，从分析马寨油田地质特征、流体性质、开采现状以及注入水、产出水水体性质入手，研究了注入水、产出水中多种离子变化规律，对地层结垢、渗透率的影响，与地层矿物、地层水的配伍性．并通过注水压力、吸水指数、吸水剖面、腐蚀、结垢等矿场反应，评价了马寨油田经过２年注入２０２×１０４ｍ３改性水后，随着注入水水体性质的变化，产出水的性质也发生了变化，但地层水能力没有减弱，没有堵塞现象和结垢现象发生．

The Formation Behavior after Injecting Modified Water into Mazhai Oil Field

The alkalscent water of 202×10 4m 3 was injected into Mazhai Oil Field in the two years of 1995 to 1997. This paper studies the effects of the injection of the modified water on the ions in produced water, formation scale deposit, formation permeability, and the compatibility of the modified water with the formation minerals and water of the oil field. The modified water is evaluated according to water injectivity pressure, water injectivity index, water injectivity profile, formation corrosion and formation scale deposit. It is shown that the property of produced water is changed, the water injectivity of formation is not reduced, and there are not formation plugging and scale deposit.