新型环乙烷降黏剂与特超稠油混合体系流动性能评价实验

Experimental Evaluation of Flow Performance of a New Type of Viscosity Reducer and Ultra Heavy Oil Mixture System

特超稠油黏度超过100000 mPa·s,流动性差、开采难度大、热采能耗高,降黏剂辅助是特超稠油开采技术重要改进方向。本文针对研发的新型环乙烷降黏剂,采用新疆春风油田特超稠油油藏作为研究样本,通过室内评价实验研究了温度、降黏剂浓度、降黏剂体积含量对特超稠油降黏效果的影响规律。研究发现特超稠油黏度随温度增加呈指数式降低,随降黏剂浓度和含量增加呈乘幂式降低,对降黏效果影响敏感性降黏剂含量>降黏剂浓度>温度;同时,对比发现10%浓度、10%体积含量的降黏剂对特超稠油降黏效果相当于提高地层温度40℃时的降黏效果,并在此基础上明确了该新型降黏剂使用参数界限。该研究对于提高特超稠油油藏采收率和降耗增效具有指导借鉴价值。

Ultra heavy oil has a viscosity exceeding 100000 mPa·s,poor flowability,high extraction difficulty,and high thermal recovery energy consumption.The use of viscosity reducing agents is an important improvement direction for ultra heavy oil extraction technology.This article focuses on the development of a new type of cyclohexane viscosity reducer,using the ultra heavy oil reservoir in Chunfeng Oilfield,Xinjiang as the research sample.Through indoor evaluation experiments,the influence of temperature,viscosity reducer concentration,and viscosity reducer volume content on the viscosity reduction effect of ultra heavy oil was studied.Research has found that the viscosity of ultra heavy oil decreases exponentially with increasing temperature,and decreases exponentially with increasing viscosity reducer concentration and content.The sensitivity of the effect on viscosity reduction is that viscosity reducer content>viscosity reducer concentration>temperature.At the same time,it was found that the viscosity reducer with a concentration of 10% and a volume content of 10% has a viscosity reduction effect on ultra heavy oil that is equivalent to the viscosity reduction effect when the formation temperature is increased by 40℃.Based on this,the parameter limits for the use of this new type of viscosity reducer were clarified.This study has guiding and reference value for improving the recovery rate and reducing consumption and increasing efficiency of ultra heavy oil reservoirs.