多层气藏一井多层开采技术界限研究

在气藏开发中，所遇到的气藏基本上都为多层气藏，而在气藏开发方案的决策中，多层气藏的开发层系的划分主要基于开发油井时的层系划分原则，并没有对多层气藏开采中的分层采气和多层合采的划分方法进行系统、定量的研究。而研究多层气藏合采和分采的技术界限对划分多层气藏的开发层系和单井采气方式的确定具有明显的工程意义。文章在建立层间无串流双层模型的基础上，利用数值模拟的方法，从气藏压力、储层物性方面采用单因素和正交因素分析方法入手，获得了多层气藏开发单井合采（分采）技术界限和界限方程，并通过实例应用说明了图版解释方法。实例应用研究表明，该方法可为多层气藏开发层系划分提供正确的理论工具。

STUDY ON TECHNICAL POLICY AND THRESHOLD VALUE OF MULTIPLE-ZONE PRODUCTION WITH ONE WELL FOR MULTI-LAYERED GAS RESERVOIR

Most of gas reservoirs existing in China are multi-layered ones. When the development program is made for gas reservoirs, the zone-dividing principle of multiple-zone production for multi-layered gas reservoirs is based on the principle for multi-layered oil reservoirs. The systematic and quantitative study was not conducted for the zone-dividing method of selective zone production and multiple-zone production of multi-layered gas reservoirs. Study on technical policy and threshold value of multiple-zone production and selective zone production for multi-layered gas reservoirs has obvious engineering significance to divide the production zones and determine the production mode of single well for multi-layered gas reservoirs. Based on the bi-layer model without inter-flow between layers, using numerical simulation, and according to the analysis of single factor and orthogonal factors on pressure and physical property of gas reservoirs, the technical policy and threshold value equation is derived for multiple-zone (selective zone) production of multi-layered gas reservoirs. With real cases, the chart interpretation method is explained. Real application shows the method provides the proper theoretical tool for the production zone dividing of multi-layered gas reservoirs.