安塞油田多油层罢间干扰分析及工艺技术对策研究

Analysis of Multi-Layers Inter-Bed Interference of Ansai Oilfield and Technology Countermeasures Study

安塞油田杏河北区是多油层比较发育的低渗砂岩油藏，纵向上由多个油层组合而成。水井采用了合注和分注两种方式，油井则采用了合采的方式。随着注水开采时间的延长和油井见效程度的不断提高．受储层间非均质性的影响，油水井的层间干扰问题逐渐暴露出来。为此，从油藏储层特征入手，利用表征多层系油藏储层非均质性的特征参数，定性分析低渗油藏储层非均质性对油井生产的影响，并通过工艺技术对策的实施，有效降低了层间干扰的问题，为下步研究和提高多层开发效果提供了技术思路。

North Xinghe district of Ansai oilfield is vertically made up of multi-layer oil reservoirs. The injectors are in two ways of commingled and zonal injection; while the producers are operated in commingling recovery. With the waterflooding time going and continuous improvement in the degree of oilwell response, impacted by reservoir heterogeneity between layers, the interference between layers is gradually exposed in oil and water injection wells. To this end, the impact of low permeability oil reservoir heterogeneity on the oil well production is qualitatively analyzed, proceeding from the reservoir characteristics, using characteristic parameters of multi-layer reservoirs heterogeneity. The inter-layer interference problems are effectively reduced through the implementation of technologic counlermeasures, supplying technical ideas for the next step to research and increase multi-layer development effects.