扶余油田自生高岭石对注蒸汽的影响  

The Impact of Diagenetic Kaolinite on Steam Injection in Fuyu Oilfield

作　　者：蒋有伟[1,2] 沈德煌[1,2] 吴永彬[1,2] 

机构地区：[1]提高石油采收率国家重点实验室,北京100083 [2]中油勘探开发研究院,北京100083

出　　处：《特种油气藏》2013年第1期60-62,153-154,共3页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"泡沫驱;水驱转热采等提高采收率新技术"(2008ZX05010-006)

摘　　要：扶余油田开采过程中存在注蒸汽压力较高等问题,为此,开展了注蒸汽室内实验研究。从该区域自生高岭石矿物含量,自生高岭石在不同蒸汽温度条件下的水岩反应产物,高岭石及高温水岩反应生成的蒙皂石对储层伤害等方面进行了影响因素分析。实验中300℃高温蒸汽条件下,静置120 h后岩心中蒙皂石含量由无上升到30%,高岭石含量由90%下降到60%。注蒸汽过程中,注汽速度远大于注水速度,造成油层的速敏性伤害,同时高温反应产生的蒙皂石可能造成水敏性伤害,导致注汽压力由较低的启动压力4～6 MPa快速上升到9.5 MPa以上,超过油层的破裂压力。研究证明,高岭石矿物含量高是造成扶余油田注汽压力高的主要原因。Lab experiment study on steam injection is carried out in view of the high pressure in steam injection in wells of Fuyu Oilfield.The mineral content of diagenetic kaolinite,the reaction products of giagenetic kaolinite and water under different steam temperatures,the damage caused by smectite,the reaction product of kaolinite and high temperature water,to formation,etc are analyzed.It is found in the experiment that the content of smectite in the core increases from 0 to 30% after keeping the core in static status for 120h under the temperature of 300℃,however,the content of kaolinite in the core decreases from 90% to 60%.During steam injection,speed-sensitivity resulting from the greater steam injection rate than water injection rate causes partially formation damage and water-sensitivity resulting from the smectite caused by the chemical reaction under high temperature also partially causes formation damage.The damages cause the increase in injection pressure from 4MPa to 6MPa rapidly to 9.5MPa,which surpasses formation fracturing pressure.The study also shows that the main reason for high steam injection pressure is the high content of diagenetic kaolinite in the reservoir sandstone of Fuyu Oilfield.

关 键 词：自生高岭石 高温蒸汽 水岩反应 蒙皂石 注汽压力 扶余油田 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]