吴起油田A井区高含水原因分析

Analysis of reasons for high water in A area of Wuqi oilfield

高含水期油田存在的主要问题为:注水井注入水沿储层渗流阻力小的优势流场区域无效循环,采油井含水率高,储层剩余油零散分布,油田开发初期的配产配注参数对于高含水期已经不再适用。因此,本文以吴起油田A井区为例,通过井组及单井分析,结合综合开发曲线,分析研究区油井高含水原因。研究区高含水的原因既有地质因素又有工程因素,地质原因包括构造、裂缝、储层非均质性3个方面;工程原因包括超破压注水、井网适应性以及人工压裂时机性选择3个方面。故明确储层地质特征以及合理的施工方式是低孔低渗油藏开发的先决条件。

The main problems existing in high water cut period are the injection of dominant flow of regional water along reservoir with low resistance invalid circulation, water cut wells rate is high, the reservoir remaining oil scattered distribution, with production and injection parameters at the initial stage of oilfield development is not suitable for high water cut period. Therefore, based on the A well area of Wuqi oilfield as an example, through the analysis of single well and well group, combined with the comprehensive exploit curve, analysis of the reason of high water cut. The reasons for high water cut in the study area include both geological and engineering factors. Geological factors include three aspects, including structure,fracture and reservoir heterogeneity. Engineering factors include 3 aspects, too, over break pressure water injection, well pattern adaptability and artificial fracturing timing. Therefore,it is a prerequisite for the development of low porosity and low permeability reservoirs to make clear the geological characteristics of reservoir and reasonable construction mode.