【摘要】 针对油藏注水开发中后期常出现的高渗条带或窜流通道难以封堵的问题,用新研制的SAMG-Ⅰ低温调堵剂进行了室内高渗透岩心封堵特性实验研究。SAMG-Ⅰ调堵剂由5%~7%的淀粉,4.5%~7%的丙烯酰胺,0.05%~0.2%的有机交联剂,0.1%~1%的引发剂,0.1%~0.5%的缓聚剂以及吉林油田地层水配制而成,在30℃地层温度下,具有成胶时间可调,凝胶强度大,成胶稳定性好、抗剪切、抗老化能力强等特性。SAMG-Ⅰ调堵剂在高渗透岩心中运移特性好,运移深度可控,与砂岩孔隙骨架粘结强度大,封堵强度高,段塞厚度达10 cm时测得突破压力为2.5 MPa,封堵率达99.91%。SAMG-Ⅰ调堵剂具有较好的封堵选择性,适用于低温油藏大孔道、窜流通道的封堵。图2表2参6。更多还原

【Abstract】 To solve the troubles connected with highly permeable zones,passages or channellings often created in oil reservoirs at their middle-late stages of water flood,a newly developed low temperature water plugging agent,SAMG-Ⅰ,is investigated in core flow tests for its sealing/plugging capacities.SAMG-Ⅰ is prepared from 5—7% starch,4—7% acrylamide,0.05—0.2% organic crosslinker,0.1—1.0% initiator,and 0.1—0.5% retarder in produced water of Jinlin oil fields and gelates at the reservoir temperature,30℃,in a controllable time to give a strong,stable and shear and ageing resistant gel.SAMG-Ⅰ in ungelled stage can easily transfer in high permeability cores to reach the depth needed and produce strong blockages in the place after gelation with strong adhesion to porous sandstone matrix.A breakthrough pressure of 2.5 MPa and a plugging rate of 99.91% are determined for a core with SAMG-Ⅰ plug 10 cm deep placed and gelled.In paralell core test SAMG-Ⅰ enters selectively into the high permeablity core thus can serve for plugging big passages,highly permeable zones,and channellings in reservoirs.更多还原