水驱砂岩油藏开发调整全过程井网密度与采收率关系

Relation between well pattern density and recovery factor through the whole period of development adjusting in sandstone reservoir

分析了我国石油天然气行业标准"石油可采储量计算方法(SY/T5367—2010)"中3个水驱砂岩油藏采收率经验公式的局限性,认为这3个经验公式具有各自的适用条件;基于大庆萨尔图油田中区西部密井网开发试验得到的经典的5类砂体水驱控制程度与井距关系,建立了不同规模砂体不同井距条件下水驱控制程度计算公式;基于中国石油勘探开发研究院水驱砂岩油藏采收率经验公式,考虑水驱控制程度建立了描述注水油田开发调整全过程的井网密度与采收率关系。渤海P油田应用表明,本文建立的新关系式可以更好地描述稀井网至密井网全过程的井网密度与采收率关系。

The limitation of three empirical recovery factor formulas for water flooding sandstone reser- voir from Oil ~ Gas Industry Standard of China ＂Calculating methods of petroleum recoverable reserves （SY/T 5367-2010）＂ is analyzed and it is considered that they have their own applicable conditions. Formu- las of water flooding control degree with different sand body scales and well spacing are established based on the relation of five kinds of sand body water flooding control degree and well spacing from the dense well pattern development trial in mid-western Saertu oilfield. Considering water flooding control degree, a relation between recovery factor and well pattern density through the whole period of development adjusting in sandstone reservoir is established based on the empirical recovery factor formula of water flooding sandstone reservoir created by CNPC Exploration and Production Research Institute. The application in P oilfield of the Bohai sea shows that the new formula can more precisely express the variation trend of water drive recovery factor with well pattern density.