水平井在定边油田长7致密油藏的开发效果分析

Analysis of Horizontal Wells Development Effect of Chang 7 Tight Reservoir in the Dingbian Oilfield

定边油田长7油藏是典型的"三低"即低压、低渗、低产油藏,具有连续性好、规模大的特征,初步估算含油面积约300 km^2,储量估算约1×10~8t。本研究主要针对常规井网难以有效动用致密油藏的问题,采用不同井网试验效果分析,总结优选适合本区域的水平井注采井网。研究认为:水平井开发是目前开发致密油藏最有利的开发方式,其中水平井七点井网、交错七点井网、五点井网应用效果较好。同时,对水平井的注水开发、天然能量开发以及注水吞吐3种不同开发方式,进行效果分析,为后期定边油田长7致密油藏规模建产提供了参考。

The Chang 7 reservoir is a typical ＂three low＂（ low pressure ,low permeability and low production） reservoir in Dingbian oilfield, and it has the characteristics of good continuity and large scale. It preliminary estimates at about 300 km^2 oil area and 1×10^8t tons petroleum. In view of the fact that the conventional well pattern can not be used effectively in the dense oil reservoir, and the effect of different well patterns was analyzed. It summarizes and optimizes well patterns of horizontal injection production. It results：the most favorable way to develop tight reservoir is the development of horizontal well at present, and seven well pattern, staggered seven well pattern and well pattern of five points are better than others in the application effect. At the same time, this paper analyzes the effect of 3 different development methods of horizontal well water - flooding, natural energy development and water injection huff and puff,and it provides a reference for Chang 7 tight reservoir production and construction scale in the Dingbian oilfield.