多层小卡距分注工艺研究与应用

Research and Application of the Multilayer Injection of Short-Location Well

随着长庆油田精细分层注水试验的持续进行,低渗透油藏油层细分层注水工艺技术还需进一步提高。针对长庆靖安油田"厚油层、层内多小层"的油藏特点,通过分注工艺优化、工具研制及管柱组合优化等,实现从笼统注水、2层分注模式向多层小卡距的分注模式转化。改进后的多层小卡距分注工艺成功实现了百米内6级分注与更精细的分层,提高了低渗透油藏纵向多个小层的动用程度,从技术上解决了分注井层数限制与油藏开发需求之间的矛盾。

As the stratified waterflooding test of Changqing Oilfield Company goes further, the stratified water flooding technology of low-permeability oil reserves needs to be improved. Ac- cording to characteristics of ＂thick oil layers with various mini-layers＂ of Changqing Jing＇an Oil- field, technologies including layered water injection optimization, tool development and tube string combination optimization are used to fulfill non-stratified waterflooding and transformation from two-layer water injection into muhilayer short-location injection mode. The improved multilayer short-location water injection successfully achieves 6-stage multilayer injection capacity within 100 m depth and finer stratification, improving the longitudinal producing level of multiple mini oil layers in the low-permeability oil reserves. This solves the technological contradiction between the number of muhilayer injection well layers and demand on oil reserves exploration.