风城油田SAGD循环预热采出液处理技术

Produced Fluid Treatment at SAGD Steam Circulation Preheating Stage in Fengcheng Oilfield

在风城油田SAGD循环预热采出液处理中使用常规破乳药剂无法实现油水分离,采出液进入稠油处理站后,易造成净化原油含水升高、脱出污水净化困难。随着超稠油SAGD开发规模的不断扩大,亟待解决循环预热采出液的处理难题。通过物性分析、显微照相和Zeta电位测定等手段研究了循环预热采出液的稳定机理以及循环预热采出液的胶体分散特性,并研制出复合净水药剂进行破胶,结合工艺优化实现了循环预热采出液的油水分离、浮油脱水和污水净化,形成了"汽液分离+喷淋降温+油水分离+浮油回收"的循环预热采出液处理工艺技术。该技术为SAGD规模开发提供了技术保障,为同类油藏的开发提供了借鉴。

Conventional oil demulsifier is ineffective for produced fluid at SAGD steam cir- culation preheating stage in Fengcheng oilfield. The produced fluid flowing into oil process plant leads to watercut increasing in crude oil and sewage treatment difficulty. With the wide application of-SAGD technique in super heavy oil exploitation, produced fluid treatment becomes a critical problem to be resolved. The stabilization mechanism of produced fluid was investigated by physical properties analysis, micrographic determination and zeta potential measurement, and the colloidal dispersion character of-produced fluid wos recognized. Based on high efficient treatment agents and process optimization, produced fluid oilwater separation, floating oil dehydration and sewage purification were realized. The process technique that vaporliquid separation, spraying cooling, off- water separation, and floating oil recovery for produced fluid treatment was formed, which is an important technical guarantee for SAGD development and a good reference for similar reservoir development.