热采井高效封窜堵漏剂的研究与应用

为解决热采井封窜堵漏措施成功率低、有效期短的问题,研究了新型的热采井封窜堵漏剂XAN-RC.室内试验表明,XAN-RC能够在疏松的漏失层有效驻留,早期强度高,在高温作用下胶结强度不衰退反而有所增强.对XAN-RC的抗高温机理进行了研究,表明XAN-RC能够在高温的作用下发生二次水化反应,生成纤维状晶体的水化产物,从而形成牢固的网状结构,增强了界面胶结强度.新型的热采井高效封窜堵漏技术已在现场施工20余口井,成功率高,增产效果明显,措施井有效期长,具有较好的推广应用价值.

Study and applications of the high-efficiently plugging agent for thermal production wells

The plugging constructions of thermal production wells have lower success rate and shorter valid period.In order to solve these problems,a new plugging agent XAN-RC is successfully developed for thermal production wells.The experimental results show that,the plugging agent can effectively stay in unconsolidated formation,it has higher strength in the early period of plugging operation,and its cementation strength does not decrease but increase at high temperature.The mechanism of the high-temperature resistance of the plugging agent is researched,and it is held that,XAN-RC takes place secondary hydration and produces fibrous crystalline product at high temperature,this product has strong netted texture,and therefore,its interfacial cementation strength is improved.The high-efficiently plugging agent is applied to above 20 wells,and the plugging constructions reach to higher success rate,longer valid period and better production-increasing result.