屈亚光,何佳奇,宋心成,谭京涛,任丽霞,侯朋军,王斌
Qu Yaguang,He Jiaqi,Song Xincheng,Tan Jingtao,Ren Lixia,Hou Pengjun,Wang Bin

• 1:长江大学石油工程学院
• 2:低碳催化与二氧化碳利用全国重点实验室(长江大学)
• 3:中国石油大学(北京)地球科学学院
• 4:中国石油塔里木油田公司英买管理区

摘要(Abstract)：

缝间注CO_2异步注采手段是低渗油气藏开发的重要手段，为进一步探究缝间注CO_2异步注采的最优参数，以长庆油田A区块为例，采用油藏数值模拟方法，结合缝间注采与CO_2注入技术，建立致密油藏模型，通过正交试验优化注采参数，对闷井时间、产液量和注采轮次等进行优选，并以累计产油量和换油率为评价指标进行效果评价。结果表明：正交试验得出最优参数组合为缝间距60 m、CO_2注入速度10 000 m~3/d、注入时间90 d，该条件下累计产油量最高；当闷井时间达到45 d时累计产油量最大；产液量25 m~3/d下前期-中期的累计产油量最高；异步注采5轮时累计增油量达6 598.06 m~3，经济效益最优；矿场试验中，应用该技术累计产油量为15 640.58 m~3，为注水开发的2.6倍。该缝间注CO_2异步注采技术可提高换油率和致密油藏的采收率，增加开发效益，优化后的参数组合可为同类油藏的高效开发提供依据。
Inter-fracture CO_2 injection with asynchronous injection-production is a key method for low-permeability reservoirs development. To further explore the optimal parameters, taking block A in Changqing Oilfield as an example, numerical reservoir simulation is used to establish a tight oil reservoir model by combining inter-fracture injection-production with CO_2 injection technique, and orthogonal experiments are conducted to optimize injectionproduction parameters such as soaking time, liquid production and injection-production cycles, with cumulative oil production and oil displacement rate serving as evaluation indicators. The results indicate that, the optimal parameters combination derived from orthogonal experiments includes fracture spacing of 60 m, CO_2 injection rate of 10 000 m~3/d and injection time of 90 days, achieving the highest cumulative oil production. Maximum cumulative oil production is achieved at 45 days of soaking time, while a liquid production of 25 m~3/d leads to the highest cumulative oil production in the early and middle stages. After 5 cycles of asynchronous injection-production, the cumulative incremental oil reaches 6 598.06 m~3, demonstrating the best economic benefit. In field tests, cumulative oil production of this technique is 15 640.58 m~3, which is 2.6 times that of water flooding. The technique of interfracture CO_2 injection with asynchronous injection-production significantly improves oil displacement rate and recovery in tight reservoirs, with development benefit increased. The optimized parameters combination provides a basis for efficient development of similar reservoirs.

关键词(KeyWords)： 致密油藏;缝间注采;异步注采;油藏数值模拟;注采参数
tight oil reservoir;inter-fracture injection-production;asynchronous injection-production;numerical reservoir simulation;injection-production parameters

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“致密砂岩油提高采收率关键技术基础理论研究”（2025ZD1405401）;; 中国石油天然气股份有限公司科技创新基金项目“致密砂岩气藏多尺度流动规律及流场耦合研究”（2016D-5007-0208）

作者(Author): 屈亚光,何佳奇,宋心成,谭京涛,任丽霞,侯朋军,王斌
Qu Yaguang,He Jiaqi,Song Xincheng,Tan Jingtao,Ren Lixia,Hou Pengjun,Wang Bin

DOI: 10.19597/J.ISSN.1000-3754.202508006

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