程杰成,孙天一,王刚,刘勇,白军辉,顾子琛,兰玉波
CHENG Jiecheng,SUN Tianyi,WANG Gang,LIU Yong,BAI Junhui,GU Zichen,LAN Yubo

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司
• 3:黑龙江省油层物理与渗流力学重点实验室
• 4:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

为评价古龙页岩油弹性开发后储层吸气能力，验证CO_2吞吐增能效果及吞吐对邻井生产动态的影响，在古龙页岩油核心区构建“地下实验室”，以GY40井青山口组二段Q_8―Q_9油层为靶层开展矿场试注试验。采用阶梯升速方式累计注入CO_2量为1.1×10~4 t，闷井30 d后开井返排，系统监测GY40井及邻井生产响应。结果表明：GY40井阶段累计产油量由措施前的36 t增至462 t，增幅达12倍；邻井Q_9-H5井在注气约75 d后产油量上升、含水率下降，返排气中CO_2体积分数由1.1%升至8.1%，显示直井-水平井间已建立有效驱替通道；吸气与产液剖面显示该井段吸气及产出均匀，证实直井具备作为注采井组核心实施立体开发的潜力；试验发现注气过程中G72井出现井口结冰、CO_2体积分数达80%的气窜显示，推测与断层活化或井筒完整性有关；直井CO_2吞吐可有效提升古龙页岩油单井产油量，直-平井网具备构建有效驱替的地质基础，但规模化应用中需重视气窜风险防控。研究成果为古龙页岩油CO_2驱技术推广提供了关键矿场依据，对推动陆相页岩油效益开发具有重要指导意义。
In order to evaluate CO_2 absorption capacity of Gulong shale oil reservoir after elastic development and verify energy replenishment effect and the impact of CO_2 huff and puff on production performance of adjacent wells, an “underground laboratory” is established in the core area of Gulong shale oil. A field trial injection test is conducted by taking Q_8-Q_9 reservoirs in the second member of Qingshankou Formation in Well GY40 as target reservoirs. A total of 1.1×10~4 t of CO_2 is injected using a stepwise rate-increasing method, followed by a 30-day soaking period before flowback, systematically monitoring production response of Well GY40 and adjacent wells. The results show that, the cumulative oil production of Well GY40 increases from 36 t to 462 t after treatment, representing a 12-times increase. In adjacent well Q_9-H5, oil production increases and water cut decreases approximately 75 days after gas injection, with CO_2 volume fraction in produced gas increasing from 1.1% to 8.1%, indicating the establishment of an effective displacement channel between vertical wells and horizontal wells. CO_2 absorption and liquid production profiles reveal that the absorption and production in the well interval are uniform, confirming the potential of vertical wells as the core of injection-production well patterns for three-dimensional development. During gas injection process, Well G72 exhibits wellhead freezing and gas channeling with a CO_2 volume fraction of 80%, possibly relating to fault activation or wellbore integrity. CO_2 huff and puff in vertical wells effectively enhances singlewell oil production of Gulong shale oil, and the vertical-horizontal well pattern provides a geological basis for effective displacement. However, attention should be paid to gas channeling risk prevention and control in large-scale application. The research provides key field reference for popularizing CO_2 flooding technology in Gulong shale oil, being of significant guidance for promoting the economic development of continental shale oil.

关键词(KeyWords)： 古龙页岩油;CO_2吞吐;提高采收率;驱替;青山口组
Gulong shale oil;CO_2 huff and puff;enhanced oil recovery;displacement;Qingshankou Formation

Abstract:

Keywords:

基金项目(Foundation): 黑龙江省重点研发计划项目“陆相页岩油二氧化碳驱油与埋存技术研究与试验”（SC2024ZX09C0146）

作者(Author): 程杰成,孙天一,王刚,刘勇,白军辉,顾子琛,兰玉波
CHENG Jiecheng,SUN Tianyi,WANG Gang,LIU Yong,BAI Junhui,GU Zichen,LAN Yubo

DOI: 10.19597/J.ISSN.1000-3754.202511033

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