气顶油环协同开发下油气界面运移规律研究

针对气顶油环协同开发时，油气界面运移规律认识不清的问题，展开了不同采气速度下油气界面运移规律的研究，研究中通过三维可视化气顶油环油藏物理模拟装置和与室内实验等尺寸的数值实验模型，模拟不同采气速度下气顶油环油藏的开发过程，通过模型可视窗口和数值模型饱和度场，实时观察记录油气界面运移规律以及油井生产动态。实验结果表明，随着采气速度增加，气顶膨胀能得到有效抑制，油气界面运移速度减慢，且内、外油气界面运移速度逐渐趋于平衡，油气界面运移形态逐渐稳定，有效减缓油井气窜的发生，增加气顶膨胀驱油的动用范围。通过物质平衡原理，建立气顶油环协同开采的油藏工程方法，推导不同开发方式下的油气界面运移规律，计算结果表明，当采油速度越小，采气速度越大时，油气界面向油环侵入的速度越小，合适的采油速度和采气速度可以保持油气界面平衡。

Experimental Studies on Oil and Gas Coordinated Development#br#Mechanism of Oil Rim Reservoirs

In order to study the mechanism of oil and gas coordinated development in oil rim reservoirs，three-dimensionalvisualized gas-cap reservoir physical simulation device was established to simulate the processes of oil and gas developmentat different gas production rates. Monitoring and records of the interface migration law and well performance can be realizedthrough visualization window. According to experimental results，migration speed of oil-gas interface was reduced with increasinggas production rates while migration speeds of internal and external oil-gas interfaces gradually became close，whicheffectively slows down occurrence of gas channeling，reduces production gas oil ratio and increases the swept volume of gasdrive，so as to improve its development effect. And by means of the material balance principle，engineering methods for gas-capoil-rim reservoir by collaborative development are worked out to deduce the migration law of oil gas interface under differentdevelopment methods. When the gas production rate is small while the gas production rate is big，the oil gas interface tends tointrude oil rim in a much slower way，and proper oil production rate and gas production rate can maintain the balance of oil gasinterface.