不同开发阶段确定采收率的方法

Methods of determining oil recovery in different devel-opment stages

本文根据孤岛油田的实际，将其开发阶段划分为一次井网、细分开发层系、加密井网、局部细分开发层系和加密井网四个阶段。在对采收率确定方法评价的基础上，筛选出了经验公式法、水驱法和衰减法等三大类较好方法，以孤岛油田为例提出了不同开发阶段确定采收率的方法。分析得出：影响孤岛油田米收率的主要地质因素是原油地下粘度；细分开发层系和加密井网是孤岛油田提高采收率的重要开发措施。本文提出的方法，可用于确定常规注水开发条件下不同开发阶段的采收率，也为其它类型油藏在不同开发阶段确定采收率奠定了基础。其中回归公式法亦是一种确定新增探明储量采收率的好方法。

n the basis of the practical situation of Gudao oil field,4 development stages are divid-ed of primary well pattern,fine zonation,infill pattern and local fine zonation and infill pat-tern.Methods of empirical formula,water drive and decline are chosen after appraisal of themethods for determining oil recovery,and those suitable for different development stageshave been presented with Gudao oil field as an example.It has been concluded from the anal-ysis that reservoir oil viscosity is the main geologic factor that influences the oil recovery inGudao oil field,and that fine zonation and infill pattern are two major steps to enhance oil re-covery in Gudao oil field.The methods discussed in this paper can be applied to the same typeof conventional,water flooding oil reservoirs to determine oil recovery in different develop-ment stages,and they also lay a foundation for the determination of oil recovery in differentstages in other types of oil reservoirs.The regression formula is a better method that can beused to determine the oil recovery of newly proved oil reserves.