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中文摘要：
高温高压井中，钻井液密度受温度和压力的影响较大，如果按照钻井液地面物性参数来计算井底静压则会产生较大误差，在孔隙压力与破裂压力差值很小的井中，可能会产生井涌、井喷或井漏等井下复杂情况或事故。从井筒温度场的数值模拟入手，首先建立了钻井液循环期间井筒的温度分布模型，然后通过高温高压钻井液密度试验，分析了钻井液的高温高压密度特性，并在试验的基础上建立了高温高压钻井液密度预测模型，在此基础上，用迭代数值计算方法建立了钻井液循环期间当量静态密度预测模型。该模型将循环期间的井筒温度场模型与高温高压钻井液密度预测模型结合起来，计算出的钻井液当量静态密度较为准确。该模型为控压钻井技术提供了理论依据，对于合理控制井下压力、预防井下复杂情况和事故的发生具有指导意义。
英文摘要：
The effects of pressure and temperature on drilling fluids are considerable at high temperature and high pressure. There is a big error if the static pressure at the bottom hole was calculated with parameters of drilling fluids at stand condition, and kick, blowout or lost circulation may occur in wells with small margins between pore and fracture pressure. This work started with establishing the model for predicting the temperature distribution profile of drilling fluids inside the drill string and in the annulus during circulating, then laboratory tests were conducted and the density property of oil-based drilling fluids was investigated. Based on the test, mathematical model for predicting the density of both oil-based and waterbased drilling fluids has been established, and the correlation coefficients are higher than 0.99. Mathematical models for predicting the equivalent static density of drilling fluid have been established by combining the temperature model during circulating and density model. The Prediction models can provide theoretical basis for managed pressure drilling technology, it is significant to control downhole pressure properly and prevent problems and accidents.
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