王敉邦,杨胜来,吴润桐,陈建勋,曹虞杰
WANG Mibang,YANG Shenglai,WU Runtong,CHEN Jianxun,CAO Yujie

• 1:中国石油大学(北京)油气资源与工程国家重点实验室
• 2:大庆油田有限责任公司第二采油厂

摘要(Abstract)：

针对特低孔低渗和高黏高蜡特征的吉木萨尔芦草沟组致密油藏,通过实验和数值模拟方法研究渗吸采油过程的冷伤害特征,分析其对吞吐周期的耦合影响。室内实验表明:温度下降导致原油黏度增加190倍、可动油饱和度下降35. 3%、静态渗吸量下降47. 9%,注水温度22℃时第2吞吐周期采出程度相比第1周期下降64. 3%,证明致密油藏注水吞吐存在冷伤害。对5个注水温度下的冷伤害过程进行数值模拟表明:原油黏度由早期压力主导逐渐变为温度主导,冷伤害程度在时间上表现出"累积递增"和"滞后"现象,43℃时累计产量仅为93℃的67. 4%,渗吸机理产量贡献率下降了9. 8%,并且第3周期产量递减率是第2周期的73. 7%。该研究可为致密储层渗吸采油可行性评价提供借鉴。
Aiming at the tight oil reservoir with ultra-low porosity,low permeability,high viscosity and high wax in Lucaogou Formation of Jimusar,the characteristics of the cold damage in the imbibition recovery process were studied by the experimental and numerical simulating methods,and the coupling influences between the cold damage and the huff-puff cycles were analyzed. The laboratory experiment shows that the temperature drop causes the viscosity of the crude oil increased to 190 times,the movable oil saturation decreased 35. 3%,the static imbibition production decreased 47. 9%,the oil recovery degree of the second cycle declined by 64. 3% under 22 ℃ water injection compared with the first cycle,these conditions prove that there are cold damage in the huff and puff of the water injected tight oil reservoir. The numerical simulation for the cold damage processes for five kinds of the water temperature shows that the dominant factor of the viscosity is gradually changed from pressure to temperature,thecold damage degree in the time shows"cumulative progressive increase"and "lag"phenomena,the cumulative oil production at 43 ℃ is only 67. 4% of 93 ℃,the production contribution of the imbibition mechanism is decreased by 9. 8%,and furthermore the third-cycle production decline rate is 73. 7% of that of the second cycle. The study can provide the reference for the feasibility evaluation of the imbibition recovery in tight oil reservoirs.

关键词(KeyWords)： 致密油藏;渗吸采油;冷伤害;室内实验;数值模拟
tight oil reservoir;imbibition oil production/recovery;cooling/cold damage;laboratory/indoor experiment;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划“973”项目“陆相致密油高效开发基础研究”(2015CB250904);; 国家自然基金项目“致密油储层基质渗吸规律及原油动用机理研究”(51574257);国家自然基金项目“超深层碎屑岩油气藏渗流物理基础研究”(51774300)

作者(Author): 王敉邦,杨胜来,吴润桐,陈建勋,曹虞杰
WANG Mibang,YANG Shenglai,WU Runtong,CHEN Jianxun,CAO Yujie

DOI: 10.19597/j.issn.1000-3754.201712016

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