高浓度高分子量部分水解聚丙烯酰胺与低黏纤维素共混堵漏体系性能评价

发布时间：2018-06-15 14:23

  本文选题：部分水解聚丙烯酰胺(HPAM) + 低黏纤维素　； 参考：《油田化学》2017年03期

【摘要】：为获得高浓度高分子量聚合物与低黏纤维素共混堵漏体系的性能特征,采用应力控制流变仪、黏度计、扫描电子显微镜和冻胶阀承压测试装置等研究了高浓度、高分子量部分水解聚丙烯酰胺(HPAM)与低黏纤维素、醋酸铬交联剂、pH调节剂(Na HCO3)共混堵漏体系的黏弹性和固化后的承压强度。结果表明,HPAM溶液的储能模量随相对分子质量的增加而增大;添加低黏纤维素与交联剂可大幅提高HPAM溶液的黏弹性,体系黏度和固化后承压强度均随低黏纤维素加量的增加而增大;NaHCO_3可延缓体系交联的速度,随NaHCO_3加量增大,体系黏度和承压强度略有降低。25 g/L HPAM+1500 mg/L低黏纤维素+100 mg/L醋酸铬交联剂+20 mg/L NaHCO_3体系的泵注性能良好,泵注时间90 min内的黏度控制在2 Pa·s以内;该体系耐盐性良好,在70℃油藏温度条件下固化后的承压强度为0.5 MPa/m,满足堵漏作业封堵性能要求。在L-357井堵漏施工中,挤注压力最高达11.9MPa,挤入量6 m3,施工完成后对漏失层段试压15 MPa,30 min内压力保持不变。
[Abstract]:In order to obtain the properties of high concentration high molecular weight polymer and low viscosity cellulose blend, the high concentration of high concentration was studied by means of stress controlled rheometer, viscometer, scanning electron microscope and pressure test device of gel valve. The viscoelasticity and pressure-bearing strength of high molecular weight partially hydrolyzed polyacrylamide (HPAM) / low viscosity cellulose (LSC) and chromium-acetate crosslinking agent (NaHCO3) were studied. The results show that the storage modulus of HPAM solution increases with the increase of relative molecular weight, and the viscoelasticity of HPAM solution can be greatly improved by adding low viscosity cellulose and crosslinking agent. The viscosity of the system and the compressive strength after curing increased with the increase of the amount of low viscosity cellulose. NaHCO3 delayed the crosslinking of the system, and increased with the addition of NaHCO3. The viscosity and pressure-bearing strength of the system decreased slightly by .25g / L HPAM 1500 mg / L low viscosity cellulose 100mg / L chromic acetate crosslinking agent 20mg / L NaHCO-3 system. The pump performance of the system was good, and the viscosity within 90 min of pump injection time was controlled within 2 Pa / s, and the salt tolerance of the system was good. The pressure-bearing strength of the solidified reservoir at 70 鈩，

本文编号：2022347