摘要
低渗透油气藏储层基质致密,发育微纳米孔喉,毛管压力作用明显,在压裂过程中由于压裂液返排不彻底而受到伤害,导致油气藏产能降低。目前大量的研究集中于压裂液对储层裂缝的伤害,忽略了对基质的伤害。基于压力脉冲法测定原理,建立基质渗透率测定模型,并根据模型研发了压力传导仪,系统地研究压裂液对塔里木油田克深地区致密砂岩、四川盆地鲁家坪组以及须家河组页岩储层基质的伤害规律。与常规岩心流动伤害评价方法相比,压力脉冲法不需计量岩心出口端流量,而是以记录流体通过岩心时下游压力随时间的变化来评价岩心渗透性和损害程度,从而解决了低渗透岩心渗透率过低而引起的实验误差大、流量监测时间长等常规评价问题。
The tight sandstone matrix is characterized by development of micro-nano pore throats and strong capillary forces.Fracturing fluids can interact with reservoir rocks and cause formation damage resulting in decrease of productivity in oil reservoir.However,considerable previous studies are focused on the damage of the fracturing fluids on the fractures of formations without taking the effect of matrix damage on productivity into consideration.The damage rule of the fracturing fluid on Keshen tight sandstone and the shale matrix of Xujiahe Formation and Lujiaping Formation was studied systematically using a transient pressure pulse instrument that was developed according to the matrix permeability model based on the principle of transient pressure pulse method.Compared with the conventional damage evaluation method measuring the outlet flow of core,the transient pressure pulse method only records the variation of downstream pressure with time during the fluid flowing through the cores,which can evaluate core permeability and damage degree and overcome the problems of large experiment error and long flow monitoring caused by extreme low permeability of the low-permeability cores.
作者
张路锋
周福建
张士诚
王晋
李明辉
刘健伕
ZHANG Lufeng;ZHOU Fujian;ZHANG Shicheng;WANG Jin;LI Minghui;LIU Jianfu((Unconventional Natural Gas Institute,China University of Petroleum(Beijing),Beijing City,102249,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2018年第3期89-94,111,共7页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"碳酸盐岩储层难动用储量高效改造关键技术研究"(2016ZX05030005-002)
关键词
压力脉冲法
致密砂岩
页岩
储层基质
压裂液伤害
transient pressure pulse method
tight sandstone
shale
formation matrix
fracturing fluids damage
