三元复合驱后微膨型封窜剂体系的研制及应用*

Development and Application of Slightly Expanded Sealing Channeling Agent System for Ternary Flooding Formation

吴晨宇

WU Chenyu

为了提高封窜剂体系在三元复合驱环境下的固化强度，改善三元复合驱后部分管外窜槽井的封堵效果，通 过考察作为主剂的经过辐照后的丙烯酰胺与膨润土的接枝半共聚高分子衍生物混合物浓度、交联剂过硫酸铵浓 度、增强剂N，N-甲叉基双丙烯酰胺浓度、微膨剂OP-10及十二烷基苯磺酸钠浓度、硬化剂G级水泥浓度对封窜剂 固化效果的影响，得到适合三元复合驱后微膨型封窜剂体系，研究了封窜剂固化体在三元复合驱体系中的长期 稳定性、封窜剂与三元复合驱体系的配伍性以及封窜剂在三元复合驱体系环境下对岩心的封堵性能，并进行了 油田现场封堵封窜试验。优选的配方为13%～17%经过辐照后的丙烯酰胺与膨润土的接枝半共聚高分子衍生 物混合物+0.12%～0.18%过硫酸铵+0.06%～0.09% N，N-甲叉基双丙烯酰胺+0.3%～0.5% OP-10或0.8%～1.0% 十二烷基苯磺酸钠+5%～7% G级水泥的封窜剂体系的固化时间1～5 h可控，在强碱三元复合驱油体系环境中 强度超过20 N，体积膨胀倍数＜1.5倍，体积微膨可控且保持较好的高强度稳定性。岩心封堵实验表明，突破压 力超过10.0 MPa，岩心封堵率超过97%，封堵能力较好。利用该体系对三元复合驱区块内生产井窜流层位进行 封堵，全井日产液降低30.3%，日产油最高增加1.58 t，含水下降4.1%，体系对三元复合驱后窜流井具有良好的封 堵效果。图3表7参20

In order to improve the curing strength of the sealing and channeling agent system in ASP flooding environment and improve the plugging effect of external channeling well after ASP flooding，through investigating the influence of the concentrations of main agent（a mixture of irradiated acrylamide and bentonite grafted semi-copolymerized polymer derivatives）， crosslinking agent（ammonium persulfate），reinforcing agent（N，N-methyl-diacrylamide），micro-expansion agent（OP-10 and sodium dodecyl benzene sulfonate）and hardening agent（G grade cement）on curing effect，a slightly expanded sealing and channeling（SESC）system suitable for ASP flooding was obtained. The long-term stability of solidified body of SESC system in ASP flooding system and the compatibility between the SESC system and ASP flooding system were studied，and the plugging performance test of the SESC system on the core in ASP flooding system and the field plugging and channeling test were carried out. The optimal recipe of the SESC system was as follows：13%—17% main agent+0.12%—0.18% crosslinking agent +0.06%— 0.09% reinforcing agent +0.3%—0.5% OP-10 or 0.8%—1.0% sodium dodecyl benzene sulfonate+5%—7% hardening agent. The curing time of the SESC system was 1—5 h. The minimum strength of the system could still exceed 20 N，and the volume expansion multiple was less than 1.5 times after 12 months immersion in ASP environment. After soaking，the volume inflation of the system was controllable and the high strength stability was maintained. The core sealing experiment showed that the breakthrough pressure reached above 10.0 MPa and the core plugging rate exceeded up to 97%，which proved that the SESC system possessed excellent plugging ability. The field sealing test showed that the total well fluid production decreased by 30.3%，the maximum oil production increased by 1.58 t，and the water cut decreased by 4.1% after the SESC system was used to seal the cross-flow horizon of a well. The SESC system had good sealing effect on cross-flow wells after ASP flooding.

10.19346/j.cnki.1000-4092.2021.03.012