利用音叉测量井中高温高压流体特性参数的方法研究

密度和粘度是储层流体识别的两个主要参数。在油气勘探开发过程中，井中原位测量流体的特性参数（如密度、粘度等），可用于分析油气储层流体的运动和分布状况，计算流体压缩性、成分组成及含率，准确掌握油井产出剖面等重要资料。这些资料的获取对评价油藏经济价值和油气产能、制定和优化油气开采方案以及进行储层精细化管理有着极其重要的作用。.本项申请针对国高精度原位测量井下高温高压流体密度、粘度的迫切需要以及探测技术绿色环保的严格要求，拟通过理论分析、数值模拟和实验测量，掌握音叉的振动特性及其与复杂性和随机性都很强的油气水多相流体介质之间的耦合振动规律，提出适用于井下高温高压流体特性参数测量的音叉传感器优化设计方案，形成一套新的利用音叉测量井下流体密度、粘度的理论方法及温度压力校正算法，为我国油田同步、原位、快速测量井下高温高压流体密度、粘度这一难题提供理论基础和技术支撑，具有很强的应用背景和实用价值

Density and viscosity are the two main parameters to identify fluids in hydrocarbon reservoir. In the process of oil and gas exploration and development, measuring in situ the fluid characteristic parameters, such as density and viscosity, in oil-and-gas well can be used to analyse the motion and distribution of the fluid in hydrocarbon reservoir, to estimate the compressibility, component and its volumetric fraction of the multiphase fluid, and then to get the production profile of the oil-and-gas well. These data are very important for estimating the commercial value and oil-and-gas producibility of oil deposit, for formulating the optimized developing scheme, and for managing the hydrocarbon reservoir delicately..This application is aimed at the urgent need for high-precision, in-situ, and green measurement of the fluid density and viscosity at high temperature and high pressure in borehole environment. It is planned to master the vibration characteristics of the tuning fork and its coupling vibration law with the complicated and random oil-gas-water multiphase fluid medium through theoretical analysis, numerical simulation and experimental measurement. Then, an optimized design scheme of tuning fork sensor suitable for measuring the characteristic parameters of the fluid at high temperature and high pressure is proposed. Finally, a new set of theoretical methods and temperature-and-pressure correction algorithms for measuring the density and viscosity of the fluids in oil-and-gas wells using tuning forks are formed. It provides a theoretical basis and technical support for the problem of simultaneous, in-situ, and rapid measurement of the density and viscosity of downhole fluid at high temperature and high pressure in oilfields, and has a strong application background and big practical value.