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随着油田开发的深入,大庆油田原油综合含水率不断升高,大部分油井产出液含水率在90%左右。随着含水率的升高,集输原油的能耗也呈急剧上升趋势。为了实现安全不加热集输及降低能耗和生产成本,在大庆油田建立了一套试验装置,以大庆油田采油六厂喇嘛甸油田特高含水油井产出的油气水混合物为试验介质,测试了不同温度、不同含水率、不同产液量及不同含气情况下的压降及油气水混合物的流动状态。试验研究结果表明,在含水率超过85%、产液量为11～105t/d、气油比为40～60m3/t及油气水混合物的流速为0.2～2m/s、气相折算速度为0.15～1.8m/s的条件下,油、气、水三相在水平管道内的流动属于冲击流,油、水两相属于分层流或水为连续相的乳状/悬浮液。在不加任何药剂的情况下,特高含水采油期,油气水安全混输温度界限为23℃,低于原油凝固点。
With the deepening of oilfield development, the comprehensive moisture content of crude oil in Daqing Oilfield keeps rising, and the moisture content of most oil wells is about 90%. With the increase of moisture content, the energy consumption of gathering crude oil also shows a sharp upward trend. In order to achieve safety without heat gathering and reduce energy consumption and production costs, a set of test equipment was set up in Daqing Oilfield. Using the mixture of oil, gas and water produced in the ultra-high water cut oil well of Lamadian Oilfield in No.6 Oil Production Plant of Daqing Oilfield as test medium, Pressure drop under different temperature, different water content, different liquid production and different gas-containing conditions and the flowing state of oil-gas-water mixture. The experimental results show that when the moisture content is more than 85%, the liquid production rate is 11-105 t / d, the gas-oil ratio is 40-60 m 3 / t and the flow rate of oil-gas water mixture is 0.2-2 m / s, Under the condition of 1.8m / s, the flow of oil, gas and water in the horizontal pipe belongs to the impinging stream, and the oil and water belong to the milky / suspension of the continuous flow of stratified flow or water. In the absence of any agent, the ultra-high water cut, oil-gas-water safe mixing temperature limit of 23 ℃, lower than the freezing point of crude oil.