低渗透砂岩油藏开发主要矛盾机理及合理井距分析  

The main challenges and the reasonable well spacing for the development of low-permeability sandstone reservoirs

作　　者：王端平[1] 时佃海[2] 李相远[3] 陈光梅[3] 

机构地区：[1]中国科学院贵阳地球化学研究所 [2]中国科学院南京地质古生物研究所 [3]中国石化胜利油田地质科学研究院

出　　处：《石油勘探与开发》2003年第1期87-89,共3页Petroleum Exploration and Development

摘　　要：低渗透油田开发效果比初期预测效果变差的原因 ,一是由于地层压力下降 ,上覆净压力相对增加而引起渗透率降低 ;二是储集层流态由拟达西渗流变为低速高阻非达西流。根据胜利油田低渗透油藏实际 ,定义了技术极限井距概念 ;根据渗流流量方程和流速方程 ,结合室内实验确定的实验模型 (临界驱替压力梯度 )和现场资料 ,提出技术极限井距计算公式 ,以胜坨油田坨 76块进行试算 ,计算结果比较合理。图 2表 1参development effect of low-permeability oil field is getting worse than expectation result in the early days of oilfield development, duo to the fact that permeability decreases caused by formation pressure decreasing and overburden static pressure relatively increasing; and reservoir flow state changes from pseudo-Darcy seepage flow to low-velocity, high-resistivity non-Darcy flow. According to actual conditions of low-permeability reservoirs of Shengli oil field, a definition on the conception of technical limit well spacing was given; and in the light of flow rate and flow verlocity equations of filtrate and experimental model (critical displacement pressure gradient) established by lab test and in-situ data, an equation for calculating technical critical well spacing was developed. The calculation equation was used for calculating technical limit well spacing of Unit 76 of Shengtuo oil field, Shengli oil complex, and reasonable calculation results were obtained.

关 键 词：低渗透砂岩油藏开发 机理 压力梯度 易流动带 技术极限井距 

分 类 号：TE348[石油与天然气工程—油气田开发工程] TE324