新型抗盐聚合物溶液的性能及驱油效果评价

Performance of New Salt-resistant Polymer Solution and Evaluation of Oil Displacement Effect

利用室内渗流实验及岩心驱油实验,研究了新型抗盐聚合物的吸附特性、渗流特性及溶液性能对驱油效果的影响。结果表明:在普通聚合物分子链上嵌入甲基丙磺酸(AMPS)单体,可以有效地抑制地层中的钙、镁、铁、硫等二价离子对聚合物分子链的降解,显著提高其抗盐性能;经过5次动态吸附后,抗盐聚合物黏度保留率较普通聚合物高24.20%;相同浓度条件下,抗盐聚合物黏度是普通聚合物的2倍;抗盐聚合物阻力系数及残余阻力系数均小于普通聚合物,更接近于线性,具有更好的注入性能,聚驱采收率较普通聚合物高3.5%,单位用量提高采收率较普通聚合物高8.5%。

In this paper,the influence of the adsorption characteristics,percolation characteristics and solution properties of the new salt-resistant polymer on the oil displacement effect was studied by using the laboratory percolation experiment and core oil displacement experiment.The results show that the incorporation of AMPS monomers into polymer chains can effectively inhibit the degradation of polymer chains by divalent ions such as calcium,magnesium,iron and sulfur in the formation,and significantly improve their salt resistance.After 5 times of dynamic adsorption,the viscosity retention rate of salt resistant polymer is 24.20%higher than that of common polymer.At the same concentration,the viscosity of salt resistant polymer is twice that of ordinary polymer,and the resistance coefficient and residual resistance coefficient are smaller than those of ordinary polymer.The structure of salt resistant polymer is more linear and has better injection performance.The total oil recovery of salt resistant polymer is 3.5%higher than that of common polymer,and the EOR of unit dosage polymer is 8.5%higher than that of common polymer.