考虑动态质量流的变梯度钻井井筒压力预测  

Prediction of wellbore pressure in variable-gradient drilling considering dynamic mass flow

作　　者：张锐尧 王文明 樊鹏 巨江涛 李军[1] 张伟[5] ZHANG Ruiyao;WANG Wenming;FAN Peng;JU Jiangtao;LI Jun;ZHANG Wei(China University of Petroleum,Beijing,Beijing 102200,China;CNPC Xibu Drilling Engineering Co.Ltd.,International Engineering Company,Urumqi,Xinjiang 830014,China;PetroChina Coalbed Methane Co.Ltd.,Linfen Branch,Taiyuan,Shanxi 042300,China;China Petroleum Changqing Oilfield Branch Oil Production Plant 5,Xi’an,Shaanxi 710000,China;PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油大学(北京),北京102200 [2]中国石油西部钻探工程有限公司国际工程公司,新疆乌鲁木齐830014 [3]中石油煤层气有限责任公司临汾分公司,山西太原042300 [4]中国石油长庆油田分公司第五采油厂,陕西西安710000 [5]中国石油新疆油田分公司,新疆克拉玛依834000

出　　处：《中国海上油气》2025年第2期210-219,共10页China Offshore Oil and Gas

基　　金：国家自然科学基金项目“深水油气钻采井筒压力控制基础研究(编号:51734010)”;国家自然科学基金联合基金项目“海相深层高温高压钻完井工程基础理论及控制方法(编号:U19B6003-05)”部分研究成果。

摘　　要：为了探究注空心球多梯度钻井中被分离的空心球由钻柱内进入环空时所产生的动态质量流对井筒温压场的影响规律,考虑动态质量流动对传热与传质过程影响、井筒与地层间能量交换和多梯度参数对钻井液物性参数影响,建立了多梯度钻井瞬态井筒温度压力耦合场模型,结合经典模型和测试数据对模型进行验证;对比分析了传统钻井、双梯度钻井和考虑动态质量流变梯度钻井井筒温压场分布规律。结果表明:本文模型弥补了以往模型只考虑多梯度参数所导致的预测误差,利用经典模型和测试数据验证了模型的准确性,模型精度最高可以提升7%;动态质量流会减小分离器处环空温度约5℃,使得分离口处的钻井液密度增大,井底压力升高1.75~3.05 MPa;井筒压力在分离器处存在拐点,整体呈“折线形”分布,分离器位置和数量与拐点的位置数量相同。该研究可以为多梯度钻井井筒压力预测和控压钻井参数优化提供参考。To explore the influence law of dynamic mass flow generated during the entry of separated hollow spheres from the drill string to the annular space on wellbore temperature and pressure fields during multigradient drilling with hollow spheres,this study established a coupled field model of transient wellbore temperature and pressure for multi-gradient drilling,which considered the influence of dynamic mass flow on heat and mass transfer processes,energy exchange between the wellbore and formation,and the influence of multi-gradient parameters on the physical properties of drilling fluid.The model was validated using classical models and test data.The study compared and analyzed the distribution rules of wellbore temperature and pressure fields under traditional drilling,dual-gradient drilling,and variable-gradient drilling considering dynamic mass flow.The results show that this model compensates for the prediction error caused by previous models only considering multi-gradient parameters,and its accuracy is verified using classical models and test data.The model accuracy can be improved by up to 7%.Dynamic mass flow can reduce the annulus temperature at the separator by 5℃,resulting in an increase in the density of drilling fluid at the separation port and an increase in bottom-hole pressure by 1.75-3.05 MPa.There is an inflection point of the wellbore pressure at the separator,and the overall distribution is in a“broken-line”shape.The position and number of separators are the same as those of inflection points.This study can provide reference for predicting wellbore pressure and optimizing pressure control drilling parameters in multi-gradient drilling.

关 键 词：变梯度钻井 动态质量流 传热与传质 井筒温压场 预测模型 

分 类 号：TE271[石油与天然气工程—油气井工程]