疏松砂岩稠油油田引热降黏技术研究与应用

The application of and research on geothermal water flooding technology in loose sandstone heavy oil fields

针对南海F疏松砂岩稠油油田投产后地层压力下降快、油井产量递减快、储层出砂堵塞井筒和平台无注水工程预留等问题,在对油层下部高温水体供给能力、引热降黏效应、采收率等方面分析研究的基础上,创新提出了一种利用油层下部高温热水在井下实现注水的引热降黏技术,同时研发了与此配套的引热降黏单层及分层注水工艺管柱、封隔颗粒控水防砂工艺。室内实验和数值模拟表明:引热降黏技术可以明显降低原油黏度,提高油田采收率13.1个百分点;研发的引热降黏注水工艺管柱在现场试验中得到成功应用,单井日产油、地层压力水平均得到明显提升,实现了平台无注水工程预留下的稠油注热水开发,为海上类似普通稠油的热水驱开发提供了一种新的开发思路,具有借鉴意义。

After F loose sandstone heavy oil field in the South China Sea is put into production,there are problems such as rapid decline in formation pressure,fast drop in well production,wellbore blocking by sand and platform without water injection facilities.Based on the analysis and research on the supply capacity of high-temperature water in the lower part of the oil formation,the effect of heat transfer and viscosity reduction,and the enhancement of recovery rate,a new technology of heat transfer and viscosity reduction was proposed using high temperature hot water in the lower part of oil layer,and also developed a single-layer and stratified injection process pipe column of induced heat and viscosity reduction.In addition,the matched single-layer and multi-layer water injection pipe string and the water-sand control technology were designed.The results of experiment and numerical simulation show that the geothermal water flooding technology can significantly reduce the oil viscosity and improve oil displacement efficiency by 13.1 percent.The new single-layer and multi-layer water injection pipe string and the water-sand control technology have a successful field application.Finally,the daily oil production and the formation energy both increased significantly,realizing the hot water injection without increasing water injection facilities and providing a new idea and valuable reference for heavy oil fields of the same nature through hot water flooding.