抗高温抗盐聚合物增黏剂的研制与性能评价

Development and Evaluation of Temperature and Salt Resistant Polymer Viscosifier

针对聚合物类增黏剂在高温和高盐环境下降解失效,不易现场维护等问题,以丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸、N-乙烯基吡咯烷酮、白油及配套乳化剂为主要原料,采用反相乳液聚合法合成了高相对分子质量的抗温抗盐聚合物增黏剂DQVIS,考察了该剂的抗老化性、增黏性、降滤失性,并以DQVIS替代原深层水基体系中的增黏剂考察了DQVIS对钻井液体系性能的影响。研究表明:DQVIS的抗温能力突出,质量分数1%的DQVIS溶液在180℃老化16 h后仍能达到72%的黏度保留率,能够满足深井钻井中钻井液提黏要求。DQVIS具有优良的降滤失能力,分别向淡水基浆、盐水基浆和饱和盐水基浆中加入0.6%DQVIS后,180℃老化前/后的滤失量分别为6.8 mL/8.2 mL、8.0 mL/14.8 mL和10.0 mL/15.8 mL,DQVIS与深层体系中其他处理剂配伍良好,加量少,溶解速度快,尤其可以满足冬季施工的需求。

In view of the problems of polymer tackifier,such as degradation failure in high temperature and high salt environment and difficulty in field maintenance,the polymer tackifier DQVIS with high relative molecular weight was synthesized by inverse emulsion polymerization with acrylamide,2-acrylamido-2-methylpropanesulfonic acid,N-vinyl pyrrolidone,white oil and matching emulsifier as main raw materials.The anti-aging,viscosity increasing and fluid loss reducing properties of the agent were evaluated,and the effects of the tackifier DQVIS on the performance of the deep water-based drilling systems were evaluated by replacing the tackifier in the original system with DQVIS.The results showed that DQVIS had outstanding temperature resistance,and the viscosity retention rate of DQVIS solution with mass fraction of 1%could still reach up to 72%after aging at 180℃for 16 h,which could meet the requirements of viscosity enhancement in deep well drilling.DQVIS had excellent filtration reducing ability.When adding 0.6%DQVIS into fresh water-based mud,salt water-based mud and saturated salt water-based mud,the filtration loss before and after aging at 180℃was 6.8 mL/8.2 mL,8.0 mL/14.8 mL and 10.0 mL/15.8 mL,respectively.DQVIS had good compatibility with other treating agents in the deep water-based drilling system,the dosage was small and the dissolving speed was fast,morever,DQVIS could especially meet the requirements of construction in winter.