温度压力与钻井液密度相互影响规律研究  

Interrelationship Between Temperature-Pressure and Drilling Fluids Density

作　　者：宋洵成[1] 王振飞[1] 韦龙贵 何连 

机构地区：[1]中国石油大学石油工程学院,山东青岛266555 [2]中海石油有限公司湛江分公司,广东湛江524057

出　　处：《内蒙古石油化工》2012年第5期1-3,共3页Inner Mongolia Petrochemical Industry

基　　金：国家863课题(项目编号:2006AA09A106)<深水钻完井关键技术>子课题<深水井身结构优化技术>资助

摘　　要：研究温度和压力对钻井液密度的影响对准确预测井下压力场和温度场以及合理确定钻井液密度具有重要意义。本文基于钻井液密度实验数据,对比分析了现有密度预测模型的准确度,并利用准确度较高的预测模型编程研究了温度和压力对3000m深和7000m深井的井下静液柱压力计算的影响。研究表明,诸多钻井液密度预测模型中K arstad法比较准确;当钻井液温度在井筒内以地温梯度增加时,钻井液密度随井深增加而减小,井深小于7000m时,温度和压力引起的钻井液密度偏差小于5%,静液柱压力偏差小于2%。Researches on the effects of temperature and pressure on drilling fluid density is significant to predict down hole temperature and pressure field and reasonably determine the drilling fluid density.Based on the experimental data of drilling fluid density,comparative analysis on the prediction accuracy from available density models has been conducted.Effects of temperature and pressure on the down hole hydrostatic pressures on a 3000 m deep and a 7000 m deep well were studied using the computer program developed with the density model with higher accuracy.Researches show that the Karstad density model is more accurate than others,the drilling fluid density decreases with increased well depth when the mud temperature increases with depth at geothermal gradient,when the well depth is less than 7000 meters,the deviation of drilling fluid density caused by temperature and pressure less than 5% and the deviation of hydrostatic pressure is less than 2%.

关 键 词：密度 钻井液 温度 压力 

分 类 号：TE2[石油与天然气工程—油气井工程]