A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity  

作　　者：Ya-Kai Li Ji-Rui Hou Wei-Peng Wu Ming Qu Tuo Liang Wei-Xin Zhong Yu-Chen Wen Hai-Tong Sun Yi-Nuo Pan 

机构地区：[1]China University of Petroleum Beijing,Beijing,102249,China [2]PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China [3]Key Laboratory of Improving Oil and Gas Recovery of Ministry of Education Northeast Petroleum University,Daqing 163318,Heilongjiang,China [4]Xi'an Shiyou University,Xi'an 710065,Shaanxi,China [5]Northwest Oilfield Company,SINOPEC,Urumqi 830011,Xinjiang,China

出　　处：《Petroleum Science》2024年第1期683-693,共11页石油科学（英文版）

基　　金：This work has been Sponsored by CNPC Innovation Found(Grant No.2021DQ02-0202);Besides,the authors gratefully appreciate the financial support of the Science Foundation of China University of Petroleum,Beijing(Grant No.2462020XKBH013);Financial supports from the National Natural Science Foundation of China(Grant No.52174046)is also significantly acknowledged.

摘　　要：Conformance control and water plugging are a widely used EOR method in mature oilfields.However,majority of conformance control and water plugging agents are unavoidable dehydrated situation in high-temperature and high-salinity low permeability reservoirs.Consequently,a novel conformance control system HPF-Co gel,based on high-temperature stabilizer(CoCl_(2)·H_(2)O,CCH)is developed.The HPF-Co bulk gel has better performances with high temperature(120℃)and high salinity(1×10^(5)mg/L).According to Sydansk coding system,the gel strength of HPF-Co with CCH is increased to code G.The dehydration rate of HPF-Co gel is 32.0%after aging for 150 d at 120℃,showing excellent thermal stability.The rheological properties of HPF gel and HPF-Co gel are also studied.The results show that the storage modulus(G′)of HPF-Co gel is always greater than that of HPF gel.The effect of CCH on the microstructure of the gel is studied.The results show that the HPF-Co gel with CCH has a denser gel network,and the diameter of the three-dimensional network skeleton is 1.5-3.5μm.After 90 d of aging,HPF-Co gel still has a good three-dimensional structure.Infrared spectroscopy results show that CCH forms coordination bonds with N and O atoms in the gel amide group,which can suppress the vibration of cross-linked sites and improve the stability at high temperature.Fractured core plugging test determines the optimized polymer gel injection strategy and injection velocity with HPF-Co bulk gel system,plugging rate exceeding 98%.Moreover,the results of subsequent waterflooding recovery can be improved by 17%.

关 键 词：Low permeability reservoir High-temperature resistant gel Complexation reaction Polymer gel injection strategy Plugging rate Enhanced oil recovery 

分 类 号：TE35[石油与天然气工程—油气田开发工程] TQ427.26[化学工程]