低荧光防塌封堵剂的研制及评价

针对现有防塌封堵剂沥青类荧光级别高,石蜡类、聚合醇类易起泡、易大幅增大钻井液黏度,不能满足防塌钻井液需要的缺点,应用二异氰酸酯、乙酸乙酯和多羟基化合物合成出了一种新型封堵剂JA。应用荧光分光光度计和高温高压封堵仪研究了JA的荧光性和封堵性,评价了JA钻井液的流变性能。结果表明:JA荧光强度与蒸馏水近似;120℃、3.5 MPa条件下JA能在微裂缝和孔隙处快速封堵,形成致密封堵层;3%JA加入钻井液中不增黏不增稠,对钻井液体系流变性基本无影响。

Development and evaluation of the low fluorescence anti-soughing blocking agent

In view of the drawbacks of present anti-collapse plugging agents,such as kerite whose fluorescence level is high, and paraffin and polyalcohol which are easy to foam and substantially increase the viscosity of drilling fluid, which cannot satisfy the requirement of anti-collapse drilling fluid, a new kind of plugging agent JA is invited with diisocyanate, ethyl acetate and polyhydroxy compounds to composite . Fluorescence spectrophotometer and HTHP plugging spectrometer were used to study the fluorescence and plugging properties of JA and evaluated the rheological properties of JA drilling fluid. The results showed that the fluorescence intensity of JA was low, which was only 30 a.u; under the condition of 120 ℃ and 3.5 MPa, JA could rapidly plug microfissures and porous place and create a dense plugging layer. When 3% JA was added to drilling fluid, it would not thicken or viscosify the drilling fluid, posing nearly no effect on the rheological property of drilling fluid system.