耐温抗盐水平井封堵体系研究与应用

Study on Preparation and Application of Heat Resistance and Salt Tolerance Plugging System for Horizontal Well

杨昌华 王 斌 董俊艳 闫江华

YANG Changhua WANG Bin DONG Junyan YAN JiangHua

针对中原油田高温、 高盐和水平井中 80%是筛管完井的特点， 研发了以渗透率调节剂 RPM（阳离子三元聚合物） 为主剂的耐温抗盐水平井封堵体系 （5000 mg/L渗透率调节剂 RPM+6000 mg/L交联剂 PFR+300 mg/L稳定剂 JN）， 考察了该体系的耐温、 耐盐、 热稳定性及封堵性能。结果表明， 该体系耐温可达 90℃， 耐盐可达 25×104mg/L （其中 Ca2+、 Mg2+浓度 5000 mg/L）， 凝胶强度在 5×104 mPa·s以上， 长期热稳定性可达 90 d以上。该体系具有较好的选择性堵水性能， 封堵填砂管后水相渗透率降低 89%， 而油相渗透率仅降低 17%， 可直接用于水平井堵水， 尤其可以解决管外无法封隔的割缝筛管和裸眼方式完井的水平井堵水问题。图 10表 5参 14

According to the characteristic of high temperature and high salinity and 80% of the horizontal wells completed with screen pipes in Zhongyuan oilfield， a heat resistance and salt tolerance system， composed of 5000 mg/L permeability regulator agent cationic ternary polymer RPM，6000 mg/L cross-linking agent PFR and 300 mg/L stabilizer JN，was developed，and the heat-resistance， salt-tolerance， thermo-stability and plugging property of the system were evaluated. The result showed that the heat resistance of the system was up to 90℃， the salt tolerance of the system was of 25 × 104 mg/L（among which， Ca2+ and Mg2+ concentration was of 5000 mg/L）， the gel strength was above 5×104 mPa·s and the thermo-stability was more than 90 days. The system had good selectivity and the water plugging efficiency reached up to 89% while the oil plugging rate was only 17%. The system could plug water in horizontal wells without oil well operation， especially suitable for water plugging in horizontal wells completed with slotted screen without packers and in open hole mode.

10.19346/j.cnki.1000-4092.2016.04.016