高效双分散剂F-2的研制与应用

Synthesis and Evaluation of a High Efficient Dual Dispersant F-2

为解决固井替浆过程中钻井液和水泥浆接触后混合浆体流变性变差的问题,采用氧化-还原引发共聚反应,合成了一种高效双分散剂F-2。根据行业标准对其性能进行了评价,结果表明:聚合物钻井液和常用水泥浆加入双分散剂F-2后,其流变性能得到改善;常用水泥浆加入双分散剂F-2有助于提高水泥石强度;加入双分散剂F-2的常用水泥浆与聚合物钻井液按不同比例混合后,其流变性能没有出现明显的突变;双分散剂F-2的最优加量为0.5%。双分散剂F-2在胜利油田2口非常规水平井固井中进行了试验,在水泥浆顶替钻井液的过程中,没有出现由于钻井液与水泥浆相混流变性变差的问题,整个固井施工过程顺利,其中1口井的第一界面胶结质量优质率高达95%,第二界面胶结强度中等以上,而未应用双分散剂F-2的邻井第一、二界面胶结质量仅为合格。双分散剂F-2不仅能对水泥浆和钻井液起到良好的分散效果,也为固井替浆过程中出现的浆体增黏、变稠问题提供了新的解决途径。

In order to solve the cross-contamination problem of cement slurry and drilling fluid in ce- menting displacement process,a high efficient dual dispersant F-2 has been developed through copolymeri- zation from oxidation and reduction. According to industry standards its performance is evaluated, the re- sults show that rheological properties of polymer drilling fluid and cement slurry after adding dual disper- sing agent F-2 are improved. Common cement slurry with dual dispersing agent F-2 is helpful to improve the strength of cement stone. Common cement and polymer drilling fluid with F-2 in different proportions show no sudden change in rheological properties. Optimal dosage of dual dispersing agent F-2 is 0.5%. Then F-2 was tested in two unconventional horizontal wells in Shengli Oilfield. The rheology deterioration of mixed drilling fluid and cement slurry didn＇t occur in these tests, and the cementing process was smooth,resulting in premium cementing quality of 95% first interface and above average bond strength of second interface. In comparison, first and second interface cementation quality of the adjacent well without using of dual dispersing agent F-2 is only qualified. The dual-dispersing agent F-2 not only has good doub- le-dispersing effect on cement slurry and drilling fluid, but also provides a new solution to the viscosity in- crease and thickening of cement slurry in the process of cementing displacement.