低渗油藏天然气驱适应性研究

Research on the adaptability of natural gas drive for low-permeability reservoir

赵燕芹 李巧梅 陈德斌 张建丽 程传秀

1．中原油田分公司勘探开发科学研究院，河南 濮阳 457001 2．中原油田分公司信息中心，河南 濮阳 457001
3．中原油田分公司采油二厂，河南 濮阳 457532

Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Information Center, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China No.2 Oil Production Plant, Zhongyuan Oilfield Company, SINOPEC, Puyang 457532, China

由于低渗油藏注不进水或注水开发效果不好，采用气驱、特别是天然气驱来改善开发效果是最好的选择，但天然气驱只适合于特定的油藏，对油藏进行适应性筛选评价可提高天然气驱的成功率和经济效益。在分析影响天然气驱的客观因素的基础上，利用数值模拟技术对各影响因素进一步量化，将天然气驱目标区块的定性分析转为半定量化，提高了试验目标区块选择的有效性，为天然气驱试验区的选择提供了有利工具。在分析影响天然气驱采收率的主要客观因素基础上，结合构造、气顶、边水等因素，对中原油田的62个低渗油藏进行计算，筛选出一批适合天然气驱的目标单元，收到了较好效果。

Because of the water injection difficulty and poor flood development effect in low-permeability reservoir, the gas drive, especially natural gas drive, is the optimal selection to improve the development effectiveness. But the natural gas drive is only suitable for the particular reservoir. Reservoir adaptability evaluation can improve the success rate and economic benefits of lowpermeability reservoirs. Based on the analysis of objective factors impacting natural gas drive, this article uses the numerical simulation technology to further quantify the various effect factors, which may turn the qualitative analysis into semiquantitative analysis for the target blocks of gas drive. That has raised the effectiveness of test target block selection and has provided a powerful
tool for the test block selection. On the basis of objective factors analyzing the impact of natural gas drive on recovery efficiency, 62 low-permeability reservoirs are calculated in Zhongyuan Oilfield combined with the analysis of construction, gas cap and edge water. Some target units are selected, which is fit for natural gas drive. And better results have been received.