气顶油藏开发技术对策探讨

TECHNICAL STRATEGY DISCUSSION FOR GAS-CAP RESERVOIR DEVELOPMENT

气顶油藏的开发方式多种多样 ,影响开发动态预测的因素较多。从气顶油藏开发基本原则出发 ,针对开发中所遇到的主要技术问题 ,利用实际资料进行模拟开发 ,就构造几何形态、层间连通性等地质工程因素和开发方式、注采比、气顶气投产时机、采油速度、油气界面附近油井配产等开发技术政策因素 ,对原油采收率的影响进行了定量化研究 ,并首次对原油损失问题进行了模拟计算和探讨 ,提出了气顶油藏开发采取的几个技术对策 :完善油区注采系统 ,注意油气协调开发 ;开发次序应先开采油环油 ,4年后动用气顶气 ;降低GOC附近油井配产 ,可收到较好的效果 ;当气顶气储量相对较大时 ,采取气顶、油区同时开发的方式。

There are a variety of development schemes that can be used to exploit gas-cap reservoir, and there are many factors to influence its production performance. According to the basic development rules of gas cap reservoir, based on the realfield data, we studied the reasonable development scheme, injection production ratio, recovery rate, oil rate of well adjacent to GOC and the optimum time to produce gas cap gas. For the first time, the oil loss was calculated and discussed. As a result, a couple of development policy for gas cap reservoir were presented: ①The injection production system should be improved and the gas and oil should produced evenly; ②The oil in oil ring must be first produced, then the gas in gas cap can be produced 4 years later; ③ The oil well adjacent to GOC should be put into production at a low rate;④ The gas and oil should be produced simultaneously if the gas reserve in gas cap is relatively larger than that of oil.