八面河油田面138区沙四段开发特征分析

Analysis of Development Characteristics of Sha-4 Member of Mian 138 Area in Bamianhe Oilfield

面138区沙四段经过多年的热采开发,砂体地层能量逐年下降,储层原油流动性变差,区块的整体开发效果不断变差,稳产形势严峻。分析该区的储层特征、剩余油分布规律和井网开发状况,结合以往井网加密井的储层物性和生产情况,总结出面138沙四段开发特征及下步挖潜方向:在地层系数高、井网密度低、单井控制储量超过5×104 t的区域可部署加密井来进一步挖潜增效;在压力保持水平高的区域可采用氮气辅助工艺实现增压助排,改善热采效果。

Gone through thermal recovery for many years,Sha-4 Member of Mian 138 Area features yearby-year decrease of sand body stratum energy,worse mobility of reservoir oil and continuous poor integrated development effect.By analyzing its reservoir characteristics,remaining oil distribution discipline and well pattern development situation and combining past reservoir physical property and production status of intermediate wells,this paper confirms its development characteristics and next potential tapping direction：deploying intermediate wells in the region where formation capacity is high,well spacing density is low and controllable reserves per well exceeds 5×104 tto further tap the potential and increase the profit,and adopting nitrogen auxiliary process to increase the pressure and flowback and improve thermal recovery effect in the region where pressure level is high.