Determination of the lower limit of unheated oil gathering temperature for waxy crude oils in the low water content stage
At the early stage of oilfield development,the water content of wellhead extractive fluid is low,and the tubing flow is very easy to form water-in-oil(W/O)emulsion in the process of gathering and transporting.When the temperature of oil gathering is lowered,the wax molecules are precipitated,and a large amount of condensate adheres and accumulates on the inner wall of the tubing,resulting in the increase of back pressure at the wellhead.And in serious case,accidents such as plugging of the tubing may occur,which are a great obstacle to the cooling down and transporting.Therefore,it is of great significance to study the lower limit of unheated oil gathering temperature for waxy crude oil in the low water content stage and put forward the method of determining the boundary condition of unheated gathering temperature for the unheated gathering process in the early stage of oilfield development.The indoor pressure simulation tank device was used to carry out wall-sticking experiment of waxy crude oil in the low water content stage,wall-sticking law of waxy crude oil in the low water content stage was analyzed,and it was determined that the freezing point,water content,and shear rate was the main factors affecting the sticking wall temperature.An wall-sticking temperature prediction model for waxy crude oil in the low water content stage unheated gathering and transportation was established,which was verified by the oilfield field ring road test device,and the error was within 2℃,which met the requirements of engineering application.
low water content stagewater-in-oil emulsionunheated gathering and transportingsticky wall temperature
国家科技期刊平台
NSTL
万方数据
