液体黄原胶水包油钻井液研究

水包油钻井液作为一种深井低密度欠平衡钻井液流体,适用于低压低渗透地层的施工。通过调研国内外低密度水包油钻井液的发展状况,进行液体黄原胶水包油钻井液的室内试验。根据钻井液体系的不同,将试验分为5组,试验研究了液体黄原胶不同添加量对各组钻井液体系乳化性和流变性的影响。试验结果表明,随着液体黄原胶量的增加,各钻井液体系乳化性逐渐变好,流变性能得到了改善。通过对试验结果的分析,优选出聚磺水包油钻井液体系配方,该体系润滑性比较好,现场施工工艺较为简单;优选出低密度充气钻井液体系配方,该体系适用于欠平衡压力钻井,能够有效地保护储层。

Research on Liquid Xanthan Gum Oil-in-water Drilling Fluid

As a low-density under balance drilling fluid liquid for deep well, oil-in-water drilling fluid is suitable for the construction in low pressure and low permeability formations. By the investigation on development situation of oil-in-water drilling fluid both in China and abroad, the laboratory experiments were made on liquid xanthan gum oil-in-water drilling fluid. According to the different drilling fluid systems, the test was divided into 5 groups to test and study the effect of different additions to emulsifying property and rheology of each drilling fluid system. The experimental results show that with the increase of the liquid xanthan gum amount, the emulsifying property of each drilling fluid system is gradually improved, and so is the rheology. Through the analysis on the test results, the formula of polysulfonate oil-in-water drilling fluid system is optimized, which has good lubricity with simple construction process; and the formula of low density aerated drilling fluid system is optimized, which is suitable for under balance pressure drilling to effectively protect the reservoir.