摘要
旅大27-2油田为普通稠油油藏,冷采开发见水早,含水上升快。为了评价蒸汽吞吐可行性,优化注气方案,对储层非均质性、稠油高温降黏特性、蒸馏特性、天然气溶解降黏、周期吞吐效果等进行了实验研究。结果表明:旅大27-2油田储层非均质较强,冷采过程油水黏度比大是造成含水上升快的重要原因;热采过程,当温度大于100℃,温度对原油黏度降低不明显;该区块原油初馏点高,200℃以下,原油蒸馏效应基本不存在;注气实验表明,当原油中含有一定天然气,不仅具有明显降黏效果,而且可增加地层弹性能;蒸汽吞吐实验表明,蒸汽吞吐早期,吸气能力不高,随着蒸汽吞吐周期增加,吸气能力逐渐增加,实验周期产油量在第3周期达到最大值。研究结果可为热采注气方式实施和优化提供理论依据。
The oilfield LD27-2 isan ordinary heavy oil reservoir.Oil wells breakthrough early and water cut rising rapidly in cold production.In order to study the feasibility of steam soaking and optimize gas injection plans,it analyzes reservoir heterogeneity.The experimental studies on viscosity-temperature relationship,crude distillation,dissolution gas decreasing viscosity,cyclic steam stimulation were carried out.The results show that the serious heterogeneous and higher oil-water viscosity ratio can lead to sharp water cut increase in cold production.While the temperature is higher than 100℃,the viscosity decreasing trend slowed down with the increase of temperature.Because of high initial boiling point,there is almost no the steam distillation effect when the temperature is lower than 200℃.Dissolving gas into oil can make the oil volume coefficient increase and viscosity decrease.Although the gas injection volume of steam stimulation can not reach good result in the initial stage,the cycle oil production increases with injection cycles and tends to peak during the third cycle.The research results could provide certain reference for the optimization of steam stimulation development.
作者
高旺来
GAO Wang-lai(MOE Key Laboratory of Petroleum Engineering,China University of Petroleum,Beijing 102249,China)
出处
《科技和产业》
2021年第4期205-208,共4页
Science Technology and Industry
基金
国家油气重大专项(2016ZX05058-001-008)。
关键词
机理
稠油
蒸汽吞吐
可行性
production mechanism
heavy oil
steam stimulation
feasibility
