苏桥储气库高温高压气井纳米凝胶暂堵技术

苏桥储气库气井储层平均埋藏深度近5 000 m，地层温度140~150 ℃，注采条件下储层压力一般在35~45 MPa。气井修井作业前首先需要进行暂堵压井，常规聚合物凝胶类堵剂耐高温性能差、容易漏失造成压井效果不理想，为此，研制了耐温150 ℃纳米凝胶，对纳米凝胶成胶性能、耐高温性能和流变性能进行了评价，在苏桥储气库2口高温高压井进行了纳米凝胶暂堵压井试验。试验表明，该暂堵技术具有工艺简单、见效快、成本低等优点，可广泛应用于高温高压气井暂堵以及高温油气藏调堵堵水作业。

Nano-gel temporary plugging for high-temperature high-pressure gas wells of the Suqiao gas storage

In the Suqiao storage, the average reservoir depth of gas wells is near 5000 m, the formation temperature is 140 ℃–150 ℃, and the reservoir pressure under the injection-production condition is typically 35–45 MPa. The workover of gas wells requires a temporary well kill. However, conventional polymer gel-based plugging agents are intolerant of high temperature and prone to leak-off, which leads to unsatisfactory well-kill performance. Given this, the 150 ℃-tolerant nano gel was developed and the gelation performance, thermal tolerance, and rheology of such nano gel were evaluated. Furthermore, the nano gel temporary well kill testing was performed in two high-temperature high-pressure (HPHT) wells in the Suqiao storage. It was shown that this temporary plugging technique presents the advantages of simple operation, fast effects, and low costs, and can be extensively applied to temporary plugging of HTHP wells and profile control and water plugging of high-temperature oil and gas reservoirs.