八面河油田面12区提高采油速度改善开发效果分析

Analysis of Development Results by Enhancing Oil Recovery Rate in Mian-12 Block of Bamianhe Oilfield

胜利油田八面河油田面12区是典型的高粘、高渗、高孔隙度油藏。目前该区块平面、层间和层内非均质性严重,储量动用不均衡;主力油砂体水淹严重;井下技术状况恶化,开井数减少,注采井网不完善。沙三上段主要从控制自然递减率及降低综合含水入手,通过注水调整,层间、层内剩余油挖潜及非主力油砂体挖潜来改善开发效果;沙三中段目前存在的主要问题是综合含水高,下步工作重点是完善局部注采井网,控制综合含水;沙四段主要问题是油水井井下技术状况恶化,注水效果差,地层能量不足,日产油量下降,下步工作重点是完善注采井网,保证注水井正常注水。

Typical high--viscosity, high--permeability and high--porosity reservoirs occur in Mian--12 Block of Bamianhe Oilfield in Shengti Oilfield. Deteriorating downhole technical conditions including lateral, interlayer and intralayer high heterogeneities, uneven exploitation of reserves and severe flooding of the main oil sand bodies result in reduction of recovery wells and incomplete injection--production patterns. In upper Sha--3 Member, the authors improve the development effects mainly by adjusting water injection, excavating interlayer and intralayer remaining oil and the non--main oil sand bodies, starting with control.ling natural decline rate and decreasing comprehensive water--cut rate. In middle Sha--3 Member, the main problem is high comprehensive water--cut rate, so they will focus on perfecting local injection--production patterns and controlling comprehensive water--cut. In Sha--4 Member, the main problems are deteriorating downhole technical conditions including bad water injection effects, inefficient stratigraphic energy and declining daily oil production, .so they will focus on completing injection--production patterns and ensuring regular water injection of water injection wells.