新型聚合物研究与应用

Study and application of new polymers

分析了三次采油用聚合物驱油剂开发应用现状。针对目前聚合物驱油剂存在耐温抗盐性差等问题,开展了新型聚合物驱油剂的研究。采用疏水离子型单体与丙烯酰胺单体共聚法,成功研究了耐温抗盐性能较好的疏水缔合型聚合物,其各项性能指标均能满足特殊油层三次采油使用要求,它具有独特的“盐增粘效应”。对疏水缔合型聚合物的耐温性、抗盐性、抗剪切性、驱油效率及表观粘度等进行了系统评价。阳离子聚合物(NCP)作为一种新型驱油剂,具有耐温、抗盐等性能,可有效起到降水增油效果.其作用机理一是体系本身具有一定粘度,可改善流度比,扩大水驱波及体积;二是由于岩石矿物表面带负电荷,阳离子高分子量聚合物注入后,发生静电吸附,使油膜脱落.从而达到提高呆收率的目的。新型阳离子聚合物(NCP)不仅能满足特殊油藏的三次采油使用需要,而且还具有较好的“堵聚防窜”功能,在孤岛采油厂进行了推广应用,经济效益明显。

The present state of development and application of the polymer oil displacement agent for the tertiary oil recovery is evaluated, and to solve its problems of low temperature tolerance and poor salt re-sistance, studies are undertaken to develop new types of polymer oil displacement agent. By combined polymerization of hydrophobic ionic monomer with acrylamide monomer, a polymer of hydrophobia association is developed, with high temperature tolerance and good salt resistance. Its other specifications totally meet the requirements for tertiary oil recovery, and has the unique 'salt viscosity-accelerating effect'. A sys temic evaluation is conducted on its temperature tolerance, salt resistance, shearing resistance, oil displacement efficiency and visible viscosity, etc. Its working mechanism of the novel cationic polymer (NCP) is investigated, i. e. , the system itself has certain viscosity, which is good for improving the mobility ratio and enlarging the flooding area; negative charge is adhered on the surface of the rock, and once the cationic polymer is injected, electrostatic adsorption takes place and this peel off the oil film, thus improve the oil recovery rate. In addition, it also has good plugging and anti-channeling capability, and its applications in Gudao Production Plant obtained remarkable economic benefits.