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基于乳状液转相技术的钻井液新体系室内研究

ISSN号：1001-0890
期刊名称：石油钻探技术
时间：2013
页码：59-63
分类：TE254.6[石油与天然气工程—油气井工程]
作者机构：[1]石油工程教育部重点实验室(中国石油大学(北京)),北京102249, [2]油气资源与探测国家重点实验室(中国石油大学(北京)),北京102249
相关基金：国家自然科学基金创新研究群体项目“复杂油气井钻井与完井基础研究”(编号:51221003);国家高技术研究发展计划(“863”计划)项目“海洋特大位移井水平井钻井液关键技术研究”(编号:2012AA091502)与“致密砂岩气高效钻井与压裂改造关键技术”(编号:2013AA064800);国家自然科学石油化工联合基金重点支持项目“页岩气钻探中的井壁稳定及高效钻完井基础研究”(编号:U1262201)资助
相关项目：复杂油气井钻井与完井基础研究

关键词：油基钻井液, 乳状液转相, 储层保护, 含油钻屑, oil base drilling fluid, emulsion inverse, formation protection, oily cutting

中文摘要：

摘要：为有效解决油基钻井液应用中存在的固井质量较差、环境污染严重等问题，采用有机胺质子化可逆原理，赋予油基钻井液以乳化相态的可逆性，研制了一套可逆乳化钻井液体系。该钻井液体系的配方为5#白油＋25．0％CaCl2溶液＋1.0％有机土＋0．5％石灰＋1．0％润湿剂RS＋4．0％乳化剂ET，油水比为50：50，密度为1．2kg／L。通过室内试验对该钻井液体系进行了全面的性能评价，结果表明，通过酸触相反转和碱触相回转，可实现W／O型与O／W型间自由转换；且转换前后的钻井液性能良好：破乳电压达500～900V，抗温达180℃，高温高压滤失量小于15mL，流变性与传统逆乳化钻井液相当，可抗10％硫酸钙、20％钻屑污染，渗透率恢复率和滚动回收率都达90％以上，泥饼和含油钻屑更易处理。这说明，研制的可逆乳化钻井液体系兼备油基钻井液和水基钻井液的优点，且各项性能均为优良，能解决常规油基钻井液应用中存在的问题。

英文摘要：

A novel reversible emulsion drilling fluid which is useful in resolving the contradiction be tween drilling efficiency, cementing and environmental effect has been invented based on the protonation re- versibility of amine. The new drilling fluid system has reversible emulsion-phase behavior. The formulation of the reversible emulsion drilling fluid was：5# white oi1＋25.0% CaC12 brine＋l. 0% organoclayq-0. 5~//00 lime＋4.0 % reversible emulsifier ET＋1. 0 % wetting agent RS, oleaginous fluid to non-oleaginous fluid-ra- tio was 50/50,drilling fluid density was 1.2 kg/L. Comprehensive performance evaluation with laboratory test showed that the new drilling fluid could be readily and reversibly converted from a water-in-oil emul- sion to an oil-in-water emulsion and back to a water-in-oil emulsion using an acid-base chemical switch. And before and after converting the emulsion mud maintains good performance, with emulsion-breaking voltage of 500-900 V, resistance to high temperature of 180℃, HTHP filter loss of less than 15 mL, rheology com- parable with traditional invert emulsion drilling fluid, and resistance to 10% calcium sulfate and 20% cut- tings pollution. Additionally,both permeability recovery value and rolling recovery ratio were above 90%, and the filter cake and oily cuttings could be treated easily. This suggests that the reversible invert emul- sion drilling fluid has both merits of oil-based fluid and water-based fluid,and all properties are excellent. The reversible invert emulsion drilling fluid is capable of resolving the problems with the application of conventional oil-based drilling fluid.

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