中原马寨油田卫95块注弱碱水的初期效果  

WEAK ALKALINITY WATER FLOOD IN BLOCK WEI 95 OF MAZHAI, ZHONGYUAN: LABORATORY EXPERIMENTS AND PRELIMINARY FIELD RESULTS

作　　者：张学锋[1] 赵普春[1] 王琦龙[1] 

机构地区：[1]中原石油勘探局采油三厂工程技术大队

出　　处：《油田化学》1997年第4期320-323,共4页Oilfield Chemistry

摘　　要：中原马寨油田卫９５块从１９９５年７月底起开始注弱碱水。弱碱水是主要用Ｃａ（ＯＨ）２处理油田采出水而得到的ｐＨ在８—９的水，Ｃａ２＋、ＯＨ－含量升高而Ｆｅ３＋、Ｃｌ－、Ｓ２－含量降低。室内测定结果表明，此种弱碱性水无生成ＣａＣＯ３沉析的倾向，对储层岩芯的渗透率和粘土矿物无伤害，与地层水完全配伍。与注弱碱水前相比，注弱碱水２０个月期间注水井吸水剖面改善，区块储量动用程度提高，储层能量稳定，采出水ｐＨ值不变，矿化度和主要离子含量变化不大。A weak alkalinity water flood program is started in Block Wei 95 of Mazhai in Zhongyuan since July 1995. The weak alkalinity water is prepared by treating the produced water by mainly Ca(OH) 2to increase its pH from 6.5 to 8-9 and its contents of Ca 2+ and OH -are increased and of Fe 3+ , Cl - and S 2- -decreased. It is shown in laboratory experiments that this water has no tendency to CaCO 3precipitation, is not damageable to reservoir core permeability, not clay swelling, and compatible with the formation water. In weak alkalinity water flood over 20 months, the injectivity profile is improved, the reservoir mobilization enhanced, the reservoir pressure and the pH value of the produced water maintained and the minerality and main ions contents only slightly changed.

关 键 词：弱碱性水 注水 油田 油层 中原马寨油田 

分 类 号：TE357.61[石油与天然气工程—油气田开发工程]