一种环保型抗高温钻井液技术

随着中国对环境保护要求力度的加大，传统的磺化类、矿物油类材料使用受限，同时勘探开发向着更深发展，完钻井深不断增加，温度越来越高，目前国内环保钻井液仅能抗温达180℃，难以满足环境敏感区域深井施工要求。因此，研制合成了新型环保抗高温增黏剂BZ-ZNJ、环保抗高温降滤失剂BZ-KGJ等处理剂材料，复配其他环保处理剂，最终形成了一种环保抗高温钻井液体系。该体系抗温达到230℃，在230℃下流变性能可控，黏度切力满足施工要求，抗盐达到饱和，抗钙达到1.5%，抗黏土侵10%，钻井液的EC₅₀大于30 000 mg/L，属于无毒，金属离子含量均低于标准值，满足环境保护要求。该体系具有较好的应用前景。 

An Environmentally Friendly High Temperature Drilling Fluid Technology

With increasingly rigorous requirement imposed on environment protection, use of conventional drilling fluid additives such as sulfonates and mineral oils is restricted. With wells drilled deeper and deeper, formation temperatures are also becoming higher. The highest temperature that the drilling fluid additives presently used in China can stand is 180 ℃, and the application of these additives will be restricted in drilling wells with higher bottom hole temperatures. To address these problems, two new environmentally friendly high temperature additives, BZ-ZNJ, a viscosifier, and BZ-KGJ, a filter loss reducer, have been developed. An environmentally friendly drilling fluid was then formulated with these two new additives and other environmentally friendly additives. This new drilling fluid has rheology that is controllable at 230 ℃, and its viscosity and gel strength satisfy the needs of drilling operations. The new mud can also be made saturated with salt. It can withstand the contamination of calcium to 1.5% and the contamination of clay to 10%. EC₅₀ of the drilling fluid is greater than 30 000 mg/L, meaning that it is nontoxic. Concentration of metal ions in the drilling fluids is less than the requirements of relevant standards. This new drilling fluid should find its application in drilling operations in environment sensitive areas.