摘要
为实现封堵凝胶对高矿化度油藏的有效封堵,以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、4-丙烯酰吗啉(ACMO)为聚合单体,通过水溶液聚合法制备了耐温耐盐聚丙烯酰胺(TS-2),然后将其与交联剂乙酸铬在150℃交联成胶,制备了高抗盐凝胶封堵剂(TSP-2)。通过FTIR、1HNMR、SEM、旋转黏度计、流变仪对TSP-2进行了表征和测试,采用自制的不同渗透率的填砂管,评价了TSP-2的封堵性能,探讨了乙酸铬与TS-2的交联机理。结果表明,交联时间为6 d时,TSP-2的表观黏度最高,为94400 mPa·s,弹性模量和黏性模量在不同频率(0.1~10 Hz)和剪切应力(0.1~10 Pa)下均保持稳定;TSP-2对液测渗透率458~873 mD的填砂管的封堵率均在96%以上,突破压力梯度为4.52~17.64 MPa/m;TS-2与乙酸铬交联可分为诱导期、加速期和稳定期,乙酸铬通过水解释放的Cr3+和羟桥反应,使凝胶内部逐渐形成丰富有序的交联网络结构,导致凝胶表观黏度从缓慢变化到快速增长,最后趋于稳定。
In order to achieve effective plugging of high salinity oil reservoir,temperature and salt-resistant polyacrylamide(TS-2)was prepared from aqueous polymerization of acrylamide(AM),2-acrylamide-2-methylpropanesulfonic acid(AMPS)and 4-acrylylmorpholinium(ACMO),and crosslinked with chromium acetate at 150℃to obtain high salt-resistant plugging sealer(TSP-2).TSP-2 was characterized and analyzed by FTIR,1HNMR,SEM as well as rotary viscometer and rheometer,while its plugging performance was further evaluated by self-made sand-filled tubes with different permeability,with the cross-linking mechanism between chromium acetate and TS-2 discussed.The results showed that the TSP-2 prepared via cross-linking for 6 d exhibited the highest apparent viscosity(94400 mPa·s),and stable elastic modulus as well as viscous modulus at different frequencies(0.1~10 Hz)and shear stresses(0.1~10 Pa).The sealing rate of TSP-2 sand filled pipes with fluid permeability of 458~873 mD were all above 96%,and the breakthrough pressure gradient was 4.52~17.64 MPa/m.The cross-linking between TS-2 with chromium acetate could be divided into induction phase,acceleration phase and stable phase.Through the Cr3+and hydroxyl bridge reaction released by hydrolysis of chromium acetate,a rich and orderly cross-linking network structure was gradually formed inside the gel,resulting in the apparent viscosity of the gel changing slowly to increasing rapidly,and finally becoming stable.
作者
党志强
张光华
赖小娟
王磊
高进浩
蔺旭杰
DANG Zhiqiang;ZHANG Guanghua;LAI Xiaojuan;WANG Lei;GAO Jinhao;LIN Xujie(School of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;Key Laboratory of Auxiliary Chemistry and Technology for Light Chemical Industry,Ministry of Education,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;College of Bioresources Chemical&Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China)
出处
《精细化工》
北大核心
2025年第10期2281-2287,共7页
Fine Chemicals
基金
国家自然科学基金项目(31670596)
陕西省重点研发计划项目(2020GY-232)
陕西省教育厅项目(20JC005)。
关键词
地层水
低强度
缓交联封堵凝胶
交联网络
封堵效果
油田化学品
formation water
low strength
slow crosslinking plugging gel
cross-linked network
plugging effect
oilfield chemicals
