含（油）气流体体系压力及相变规律初步研究

STUDY OF PRESSURE AND PHASE TRANSITION OF GAS(OIL) BEARING FLUIDS SYSTEM

本文从流体体系的观点出发，应用物理化学原理，分别对含（油）气流体的流体压力和存在相态进行了研究。着重阐述了流体压力的组成和体系压力的影响因素及其定量计算方法，重新界定了静水压力和异常压力及其相互关系，对含（油）气流体在运移过程中的存在相态进行了分类，并分别探讨了流体自身成分、温度和压力对流体相变规律的影响。

Based on principles of physicochemistry, this paper studies fluid pressure and phase states of gas (oil) bearing fluid systems. The fluid pressure consists of hydrostatic pressure and system pressure. The later is a function of fluid properties (composition, volume and temperature) of the fluid system, and it can be quantitatively calculated by relevant equation of state of fluids. The phase state of the fluid is determined by solubility of relevant components. According to components and saturation degree of gas and oil, the phase states are classified into eight types. Then, major factors (temperature, pressure and composition) influencing the phase transition are discussed by using equation of state for a typical fluid system. This provides a new approach to quantitative study on properties and states of gas (oil) bearing fluid systems.