低黏耐腐蚀堵剂的研制与应用

针对高含硫气井堵水作业中现用胶乳水泥类堵剂在流变性、耐酸腐蚀及抗硫化氢性能方面的缺陷,研发了低黏耐腐蚀树脂添加剂CSL-1,其常温下塑性黏度低至37 mPa·s,高温130℃条件下2.5 h后自固化,固化后抗压强度18 MPa。CSL-1作为添加剂与水泥复配后,可提高水泥浆流变性和水泥石的耐腐蚀性。实验表明:将CSL-1加入胶乳水泥后,胶乳水泥浆常温下塑性黏度可由73 mPa·s降至60 mPa·s,固化后水泥石在质量分数为15%的盐酸溶液中浸泡7 d后,质量损失率由19.4%降至5.6%,在15%H_2S和8%CO2环境中腐蚀30 d后,水泥石强度保留率大于80%。该技术在P105-2井的连续油管堵水现场试验获得成功,表明CSL-1与胶乳水泥复配的堵剂体系满足普光高含硫气井堵水要求,具有极大的推广应用价值。

Development and application of low viscosity corrosion-resistant plugging agent

In view of the shortcomings of latex cement plugging agent in rheological property,acid corrosion resistance,hydrogen sulfide resistance for high-sulfur gas well water plugging,the resin additive CSL-1 with low viscosity and corrosion resistance was developed.Its plastic viscosity at room temperature can reach 37 mPa·s.Under the condition of 130℃,it can cure itself in 2.5 hours and the compressive strength of the sample after curing is 18 MPa.When CSL-1 was added in cement as additives,slurry rheological property and corrosion resistance of cement stone were improved.The experiments show that after adding CSL-1 into latex cement,plastic viscosity latex slurry at room temperature reduced from 73 mPa·s to 60 mPa·s.After curing,the mass loss rate of set cement decreased from 19.4%to 5.6%after 7 days of immersion in 15%hydrochloric acid solution,and the strength retention rate of set cement was over 80%after 30 days of corrosion in 15%H2S and 8%CO2 environment.This technique was successfully used in the field test of coiled tubing water plugging in Well P105-2,which indicates that the plugging agent system of CSL-1 and latex cement can meet the requirements of water plugging in gas wells with high sulfur content and has great application value.