摘要
随着油田注水开采的日益增加,储层非均质性增加、综合含水上升,严重制约着原油产量。堵水酸化作业能有效封堵高渗透层,提高低渗透层的可动用储量,使酸液均匀分布在地层,有效缓解层间矛盾。通过优选堵水不堵油的材料,制备得到具有选择性封堵的YDJ-1油溶性暂堵剂,其配方为:70%C9石油树脂+15%改性沥青+7%黄原胶+8%纳米纤维。考察了YDJ-1的溶解能力,并评价了YDJ-1在不同渗透率岩心中的阻力系数、突破压力梯度以及封堵率。结果表明,YDJ-1油溶性暂堵剂在原油中的溶解率在98%以上,对岩心堵水率在95%以上,封堵层的突破压力梯度最大能够达到50 MPa/m以上,具有良好的注入性、封堵性和选择性。
With the increasing of water flooding in oilfields,the increase of reservoir heterogeneity and comprehensive water cut seriously restrict the production of crude oil.Water shutoff acidification can effectively plug the high permeability layer,improve the available reserves of the low permeability layer,make the acid evenly distributed in the formation,alleviate the contradiction between layers.The oil-soluble plugging agent YDJ-1 with selective plugging was prepared by optimizing water-plugging and oil-free materials,the formula was 70%C9 petroleum resin+15%modified asphalt+7%xanthan gum+8%nanofibers.The solubility of YDJ-1 was investigated,and the resistance coefficient,breakthrough pressure gradient and plugging ratio of YDJ-1 in cores with different permeability were evaluated.The test results showed that the dissolution rate of YDJ-1 was over 98%in crude oil,the water plugging rate was over 95%in core,and breakthrough pressure gradient of plugging layer could reach up to more than 50 MPa/m,which indicated that the oil-soluble plugging agent YDJ-1 had a good injectivity and plugging and selectivity performance.
作者
李泽锋
高燕
王祖文
张冕
邓斌奇
徐睿
LI Zefeng;GAO Yan;WANG Zuwen;ZHANG Mian;DENG Binqi;XU Rui(Changqing Downhole Technology Operating Company,Chuanqing Drilling Engineering Limited Company,Xi’an,Shaanxi 710021,P R of China;National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Field,Xi’an,Shaanxi 710021,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2021年第1期47-51,共5页
Oilfield Chemistry
基金
国家科技重大专项“储层改造关键流体研发”(项目编号2017ZX05023-003-006)。
关键词
暂堵酸化
暂堵剂
油溶性
石油树脂
改性沥青
temporary plugging acidification
plugging agent
oil solubility
petroleum resin
modified asphalt
