稠油测试中油气分离与产量计量方法

Method for oil and gas separation and production measurement in heavy oil testing

为解决海上作业工况下稠油精准计量的难题,对分离器壳体外部加设金属软管蒸汽加热装置实现罐体伴热保温,并对分离器的管线及阀门通过电伴热系统加热保温,防止稠油在分离器内部时间过长温度降低,影响稠油分离效率;在分离器内部增设专用旋流消泡装置,增加物理消泡效果;对传统的计量罐看窗搭载改进版磁浮力液位计,精确读取计量罐液位。在渤海油田渤中区块3口井进行了试验性应用,地面计量稠油最高黏度达2 787 mPa·s (50℃),油嘴敞放,控制流程进分离器,原油进计量罐计量,天然气走栈桥燃烧,实现了高黏度稠油的精确计量。该技术解决了稠油精确计量技术难题,为渤海油田稠油井测试提供了技术支撑。

In order to solve the problem of accurate metering of heavy oil under offshore working conditions,the following countermeasures were proposed.Firstly,a metal hose steam heating device was added to the outside of the separator housing to realize the heat insulation of the tank.In addition,the electric heating system was used to heat the pipeline and valve of the separator to assure the separation efficiency of heavy oil and prevent the temperature reduction of heavy oil because of long lasting time in the separator.Secondly,a special cyclone defoaming device was added inside the separator to increase physical defoaming effect.Thirdly,a conventional metering tank viewing window was equipped with an improved version of the magnetic buoyancy level gauge to accurately read the metering tank level.The experimental application was carried out in three wells in Bozhong block of Bohai Oilfield.Under the condition that the maximum viscosity of heavy oil measured on the ground reached 2 787 mPa·s(50 ℃),and the nozzle was open without limitation,the technology can effectively control the flow into the separator,the crude oil into the metering tank,and the natural gas into the trestle to burn,thus realizing the accurate metering of heavy oil with high viscosity.This technology solved the technical problem of accurate heavy oil measurement and provided technical support for heavy oil well testing in Bohai Oilfield.