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人们一直在努力开发一种能够达到油基钻井液性能的水基钻井液体系。淀粉润滑剂合成物环保、无毒 ,并且在水基钻井液中能够稳定分散。水、淀粉和润滑剂的混合物在蒸汽加压锅内就可制得淀粉润滑剂合成物 ,所生成的水溶性淀粉分散物质含有直径 1～ 1 0 μm悬浮润滑剂微粒。由于这些微粒既不分散也不聚结 ,所以分散物质用圆筒烘干并研磨后就形成了含润滑剂质量百分比 2 8%的干燥、非油性粉末。在室内准备的木质素磺酸盐钻井液中按 5lb/bbl的干粉含量进行测试 ,测试中用的对比润滑剂有各种工业用石蜡、酯和 /或聚丁烯。标准的实验室测试表明 ,淀粉润滑剂混合物同时降低了API滤失量和高温高压滤失量 ,更重要的是未处理基浆的摩擦系数为 1 2 %～2 5 % ,近似于油基钻井液的平均值。用淀粉润滑剂合成物配成的钻井液通常只含体积比为 0 5 %的润滑剂 ,而性能要优于体积比为 3%润滑剂的现场钻井液。这些异常优越的结果以及只有普通润滑剂 的用量表明 ,此体系中润滑剂的微粒大小和分布能够提高润滑性。因此 ,有理由对此配方作进一步的研究 ,包括应用一个现场试验来评价这项最新的专利技术。
Efforts have been made to develop a water-based drilling fluid system that achieves the performance of oil-based drilling fluids. Starch lubricant compositions are environmentally friendly, non-toxic and capable of stable dispersion in water-based drilling fluids. A mixture of water, starch, and lubricant can be used to prepare a starch lubricant composition in a steam-pressure cooker. The resulting water-soluble starch dispersant contains 1 to 10 μm diameter particles of suspended lubricant. Since these particles neither disperse nor coalesce, the dispersed material is dried with a cylinder and milled to form a dry, non-oily powder containing 28% by mass of lubricant. The indoor lignin sulfonate drilling fluid was tested at a dry powder content of 5 lb / bbl and the comparative lubricants used in the test were various commercial paraffins, esters and / or polybutenes. Standard laboratory tests show that the starch lubricant mixture reduces both API and HTF losses, and more importantly, the untreated base pulp has a coefficient of friction of 12% -2.5%, similar to oil-based drilling The average value of the liquid. Drilling fluids formulated with starch lubricant compositions typically contain only 0.5% by volume of lubricant and perform better than field drilling fluids with 3% by volume of lubricant. These exceptionally superior results, as well as the amount of conventional lubricant alone, show that the particle size and distribution of the lubricant in the system can improve lubricity. Therefore, it is reasonable to make further research on this formulation, including applying a field test to evaluate this latest patented technology.