第31卷 第2期2010年3月石油学报A CT A PETROLEI SINICAV o l.31M ar.N o.22010基金项目:国家重点基础研究发展规划(973)项目(2006AA 06A 19-4)/超高温高压条件下新型钻井液技术研究0部分成果。
作者简介:王富华,男,1968年10月生,2009年获中国石油大学(华东)博士学位,现为该校副教授,主要从事钻井液和油气层保护的教学和科研工作。
E -mail:zgs dw fh @文章编号:0253-2697(2010)02-0306-05高密度水基钻井液高温高压流变性研究王富华1 王瑞和1 刘江华1 王 力2 李 军1 车连发3 宿 辉3(11中国石油大学石油工程学院 山东东营 257061; 21中国石油大庆油田有限责任公司采油工程研究院 黑龙江大庆 163453;31中海石油基地有限责任公司采油技术服务分公司 天津 300452)摘要:高密度水基钻井液属于较稠的胶体-悬浮体分散体系,固相含量大,固相颗粒分散程度高,自由水量少,在深井高温高压条件下流变性容易失控。
以室内研制的抗高温高密度淡水基和盐水基钻井液为基础,采用F ann 50SL 高温高压流变仪对钻井液在不同温度下的流变性进行了测试。
结果表明,温度是影响高密度水基钻井液流变性的主要因素。
随着温度升高,淡水基钻井液的表观黏度和塑性黏度都出现降低趋势;而盐水基钻井液的塑性黏度在150e 达到最低值,然后升高,表观黏度呈降低趋势。
利用测试数据,运用宾汉、幂律、卡森和赫-巴4种流变模式进行线性拟合发现,无论是淡水基还是盐水基钻井液,赫-巴模式最佳,幂律模式最差。
建立了预测淡水基钻井液表观黏度与温度、压力关系的数学模型,实测数据验证表明,该模型可以应用于生产实际。
关键词:高密度水基钻井液;高温高压;流变性;线性拟合;数学模型中图分类号:T E 254 文献标识码:ARheology of high -density water -based drilling fluid at hightemperature and high pressureWANG Fuhua 1 WANG Ruihe 1 LIU Jiang hua 1 WAN G Li 2 LI Jun 1 CH E Lianfa 3 SU H ui 3(11College of Petr oleum Engineer ing ,China Univ er s ity of Petroleum,D ongy ing 257061,China;21P etr oleum Eng ineer ing Resear ch I nstitute ,P etr oChina D aqing Oilf ield Comp any Limited ,D aq ing 163453,China;31CN O OC Oil Base -Oilf iel d T echnology Ser vice Comp any ,T ianj in 300452,China)Abstract :H igh -densit y drilling fluid is a thick collo id -suspension disper sed system w ith hig h solid phase content ,hig h dispersion of solid phase and lo w co ntent of free w ater.U nder the co nditions o f hig h temper atur e and high pr essure (HT HP ),t he r heo log y o fhigh -density dr illing fluid is hardly contro lled.T he rheolo g ies o f two ty pes of hig h -density w ater -based drilling f luids including the fr esh w ater -based dr illing fluid and salt w ater -based drilling fluid w ere test ed at hig h temperatur es of 50e ,80e ,120e ,150e ,180e ,200e and 220e respectiv ely ,and at hig h pressur e of 5M Pa using Fann 50SL Reometer.T he test results show ed that the t em perat ur e was the key fact or for co ntr olling t he rheolog y of high -densit y dr illing fluid.T he appar ent visco sity and plastic vis -cosity o f the fr esh water -based drilling fluid decreased with temperature increasing.F or the salt w ater -based dr illing fluid,the ap -parent visco sity decreased w ith temperature increasing ,and the plastic v isco sity decreased to the low est value at 150e and t hen in -cr eased with temperatur e rising.F our r heo log y mo dels including the Bingham M o del,P ower L aw M odel,Casson M o del and H -B M odel w ere used to simulate t he rheolog ical parameters of tw o dr illing fluids.T he results show ed that the H -B M odel was the best to depict t he hig h -density dr illing fluid at hig h temper atur e and high pressure,and the Pow er Law M o del w as the w or st.A new mathematica l model fo r descr ibing the r elations of appar ent viscosity of t he fresh w ater -based dr illing fluid wit h temper ature and pr essure w as pr oposed.T he tested data prov ed the validity o f this model in practice.Key w ords :high -density water -based drilling fluid;high temperature and hig h pressure;rheolog y;linear fitting;mathematical model深井井下温度和压力较高,这不仅要求钻井液抗高温性能好,而且具有较高密度以保证井下安全。
