金县1-1水源井缓蚀阻垢剂筛选的实验研究

Experimental Study on the Selection of Corrosion and Scale Inhibitors for Jinxian 1-1 Water Source Well

目的解决金县1-1油田井下管柱腐蚀结垢问题。方法结合金县1-1油田水源井A1W井的实际工况,运用高温高压动态腐蚀测试仪对N80钢进行模拟井筒条件实验,明确A1W井含H2S的水对N80钢的腐蚀性和结垢性。运用室内实验分别对三种缓蚀剂和五种阻垢剂的单剂进行优选,结合扫描电镜对试片表面进行微观形貌分析,筛选出合适的缓蚀剂和阻垢剂的单剂。然后开展缓蚀剂和阻垢剂的单剂配伍性实验,明确缓蚀剂和阻垢剂二者混合后的配伍性以及得出缓蚀剂和阻垢剂的最佳配比。结果筛选出的AA/AMPS阻垢剂的阻垢率可达84.2%,HS-3缓蚀剂的缓蚀率达到87.3%。缓蚀剂和阻垢剂配伍性和配比实验结果表明,HS-3缓蚀剂和AA/AMPS配伍性较好,当缓蚀剂和阻垢剂按照11:1的配比时,缓蚀率可达87.7%,阻垢率可达94%。结论优选出的复合缓蚀阻垢剂的防腐阻垢性能,可满足油田腐蚀防垢控制指标。

To solve the problem of corrosion and scaling of downhole tubing in Jinxian 1-1 Oilfield.Combining the actual working conditions of the water source well in the Jinxian 1-1 Oilfield,a high temperature and high pressure dynamic corrosion tester was used to simulate the wellbore conditions to further understand the corrosion and scaling of the N80 steel in the H2S-containing water of the A1 W well.The method of indoor experiment was used to choose the optimal single inhibitor among three corrosion inhibitors and five scale inhibitors respectively based on analyzing the micro-topography of the surface of specimens with the scanning electron microscope.Finally,carrying out compatibility experiments on the optimized corrosion inhibitors and scale inhibitors to clarify the compatibility after mixing to get the best ratio of corrosion inhibitors and scale inhibitors.The scale inhibition rate of the selected AA/AMPS can reach 84.2%,and the corrosion inhibition rate of the selected HS-3 can reach 87.3%.Compatibility experiment results show that HS-3 and AA/AMPS have better compatibility.When the ratio of corrosion inhibitor and scale inhibitor is 11:1,the corrosion inhibition rate can reach 87.7%,and the scale inhibition rate can reach 94%.The performance of the optimized composite corrosion and scale inhibitor can meet the corrosion and scale control index of oilfield.