新型无水全油基钻井液

A new water-free oil-based drilling fluid

舒福昌 岳前升 黄红玺 向兴金1,

1． 长江大学，湖北 荆州 434023 2． 湖北汉科新技术股份有限公司，湖北 荆州 434001

针对油包水乳化钻井液应用中存在的不足，研究了以生物毒性低的白油为基液的无水全油基钻井液。试验结果表明，全油基钻井液体系无水相，电稳定性好（大于2 000 V），塑性黏度低，滤失量小(滤液全为油)，具有抗钻屑、抗水污染性能强、润滑性能好、抑制性强及储层保护效果好等特点。使用无水全油基钻井液，有利于提高机械钻速、井壁稳定性和储层保护效果，可用于易塌地层、盐膏层，特别是水相活度差异较大的地层，以及能量衰竭的低压地层和海洋深水钻井。

Some shortcomings are present in the application of water-in-oil emulsion drilling fluids, so water-free oil-based
drilling fluid using the white oil of low biological toxicity as base fluid was studied in this paper. Test results indicates that
the oil-based drilling fluid system without water phase possesses a good electrolytic stability (>2000V), low plastic viscosity
and low filtration loss. The characteristics of oil-based drilling fluid were assessed such as excellent ability to cuttingsresistant
and pollution-resistant, good lubricating property, strong inhibitive ability and good reservoir protection effects.
These are beneficial to imporve ROP, borehole stability and effects of reservoir protection. The oil-based drilling fluid can be
used in the drilling of instable formation, gypsum/salt beds, different water activity formations, low pressure formation of
energy exhaustion and deep water drilling offshore.