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油包水乳化泥浆能有效地钻穿各种复杂地层,如遇水易膨胀的泥岩页岩层、膏岩层、盐岩层,防止坍塌卡钻,由于能防止泥质膨胀,有利于保护油气层的渗透性,适宜钻低压油气层,加重后可钻高压油气层,是一种较好的完井液和修井液,能耐高温,适宜于钻超深井,能耐CO_2、H_2S对金属的腐蚀,也可作为取心的钻井液。在美国钻五千米以上的超深井中有90％使用油包水乳化泥浆钻成,回收后在多口井上使用,降低了成本。
Water-in-oil emulsified mud can effectively drill through various complicated formations, such as mudstone shale, gypsum and salt rock in case of water swelling and prevent collapsible sticking, which prevents the muddy expansion and helps to protect the permeability of oil and gas layers It is suitable for drilling low pressure reservoirs. After aggravating, high pressure reservoirs can be drilled. It is a good completion fluid and workover fluid. It can withstand high temperatures and is suitable for drilling ultra-deep wells. It can resist the corrosion of metals by CO_2 and H_2S. As a coring drilling fluid. 90% of ultra-deep wells drilled more than 5 kilometers in the United States are drilled with water-in-oil emulsified mud, and after being recovered, they are used in multiple wells to reduce costs.