吕红磊,于书新,姜丽,程晓刚,刘刚,范学君
Lü Honglei,YU Shuxin,JIANG Li,CHENG Xiaogang,LIU Gang,FAN Xuejun

• 1:中国石油大庆油田有限责任公司试油试采分公司

摘要(Abstract)：

松辽盆地古龙页岩油是典型的陆相页岩油，页岩油资源潜力巨大，为实现其有效动用采用大规模水力压裂，目前尚未形成页岩油成熟的压裂后试油控排求产技术，为了实现页岩油压裂后试油求产早见油和提产目的，利用现场试验和数值模拟研究，分析了古龙页岩油压裂后见产过程中的特殊性，提出了古龙页岩油压裂后控排制度优化方法。结果表明：古龙页岩油具有渗吸驱油能力，压裂后采用适当的闷井对策有利于饱和度场的恢复，降低含水率；古龙页岩油储层有较强的应力敏感性，早期采用稳定的控排压差，控制返排有利于保持裂缝的有效性，能减少裂缝体积的损失，为裂缝的长期有效性提供保障；由于古龙页岩油相拟启动压力梯度高，通过放大产量或采取早期带压下泵的方式，快速降低流压，达到了早见油和提产目的。研究成果对松辽盆地古龙页岩油压裂后控排求产制度的制定有指导作用，应用该成果开展系统评价，取得初步效果，为下一步古龙页岩油的高效建产提供技术支撑。
Gulong shale oil is typical continental shale oil with huge resource potential. Large-scale hydraulic fracturing operation has been conducted to achieve effective producing. At present,there is no mature post-fracturing flowback control production technique for shale oil. In order to achieve the purpose of early oil breakthrough and production increase in oil testing after shale oil fracturing operation,the particularity of post-fracturing production process of Gulong shale oil is analyzed based on previous field tests and numerical simulation modeling research,and optimization method of post-fracturing flowback control scheme for Gulong continental shale oil is proposed.The results show that Gulong shale oil has imbibition displacement capacity,and appropriate well-soaking after fracturing is beneficial for saturation field recovery and water-cut decrease. Gulong shale oil reservoir has high stress sensitivity,and controlling flowback pressure difference steadily in early stage to control flowback is beneficial to maintain effectiveness of fractures,reducing the loss of fracture volume,and ensuring long-term effectiveness. Since Gulong shale oil phase has high pseudo start-up pressure gradient,raising flowback production or running pump under pressure in early stage can rapidly decrease flow pressure and realize earlier oil breakthrough and production increase. The research has guiding role for the formulation of post-fracturing flowback control production system for Gulong shale oil in Songliao Basin. By applying the above research results,systematic evaluation is performed and gets preliminary achievement,providing technical support for further efficient productivity construction of Gulong shale oil.

关键词(KeyWords)： 古龙页岩油;陆相页岩油;控排技术;闷井;压裂后求产
Gulong shale oil;continental shale oil;flowback control technique;well-soaking;post-fracturing production

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究”（2021ZZ10）

作者(Author): 吕红磊,于书新,姜丽,程晓刚,刘刚,范学君
Lü Honglei,YU Shuxin,JIANG Li,CHENG Xiaogang,LIU Gang,FAN Xuejun

DOI: 10.19597/J.ISSN.1000-3754.202112003

参考文献(References)：

• [1]孙龙德，刘合，何文渊，等.大庆古龙页岩油重大科学问题与研究路径探析[J].石油勘探与开发，2021, 48(3):453-463.SUN Longde,LIU He,HE Wenyuan,et al. An analysis of major scientific problems and research paths of Gulong shale oil in Daqing Oilfield, NE China[J]. Petroleum Exploration&Oilfield Development,2021,48(3):453-463.
• [2]何文渊，蒙启安，张金友.松辽盆地古龙页岩油富集主控因素及分类评价[J].大庆石油地质与开发，2021,40(5):1-12.HE Wenyuan, MENG Qi’an, ZHANG Jinyou. Controlling factors and their classification-evaluation of Gulong shale oil enrichment in Songliao Basin[J]. Petroleum Geology&Oilfield Development in Daqing,2021,40(5):1-12.
• [3]刘刚，杨东，梅显旺，等.松辽盆地古龙页岩油大规模压裂后闷井控排方法[J].大庆石油地质与开发，2020,39(3):147-154.LIU Gang,YANG Dong,MEI Xianwang,et al. Method of wellsoaking and controlled flowback after large-scale fracturing of Gulong shale oil reservoirs in Songliao Basin[J]. Petroleum Geology&Oilfield Development in Daqing,2020,39(3):147-154.
• [4] CLARKSON C R. Modeling 2-phase flowback of multi-fractured horizontal wells completed in shale[R]. SPE 162593,2012.
• [5] AGRAWAL S, SHARMA M M. Impact of liquid loading in hydraulic fractures on well productivity[R]. SPE 163837, 2013.
• [6] KING G E. Hydraulic fracturing 101:What every representative,environmentalist, regulator, reporter, investor, university researcher, neighbor and engineer should know about estimating frac risk and improving frac performance in unconventional gas and oil wells[R]. SPE 152569,2012.
• [7] VENGOSH A,JACKSON R B,WARNER N,et al. A critical review of the risks to water resources from unconventional shales development and hydraulic fracturing in the United States[J].Environmental Science&Technology, 2014, 48(15):8334-8348.
• [8] LUTZ B D, LEWIS A N, DOYLE M W. Generation, transport, and disposal of wastewater associated with Marcellus shale gas development[J]. Water Resources Research, 2013, 49(2):647-656.
• [9]高树生，胡志明，郭为，等.页岩储层吸水特征与返排能力[J].天然气工业，2013,33(12):71-76.GAO Shusheng,HU Zhiming,GUO Wei,et al. Water absorption characteristics of gas shale and the fracturing fluid flowback capacity[J]. Natural Gas Industry,2013,33(12):71-76.
• [10] NICOT J P,SCANLON B R. Water use for shale-gas production in Texas, U. S.[J]. Environmental Science&Technology,2012,46(6):3580-3586.
• [11]杨柳，葛洪魁，申颖浩.一种评价页岩储层压裂液吸收的新方法[J].科学技术与工程，2016,16(24):48-53.YANG Liu, GE Hongkui, SHEN Yinghao. A new method for evaluating intake of fracturing fluid in shale formations[J].Science Technology and Engineering,2016,16(24):48-53.
• [12] SHAIBU R,GUO B. The dilemma of soaking a hydraulically fractured horizontal shale well prior to flowback:A decade literature review[J]. Journal of Natural Gas Science and Engineering,2021,94:104084.
• [13] JACOBS T. Improving shale production through flowback analysis[J].Journal of Petroleum Technology,2015,67(12):37-42.
• [14] FU Y,DEHGHANPOUR H,MOTEALLEH S,et al. Evaluating fracture volume loss during flowback and its relationship to choke size:Fastback vs. slowback[J].SPE Production&Operations,2019,34(3):615-624.
• [15] HOSSAIN S,EZULIKE O,DEHGHANPOUR H. Estimating residual fracture pore volume by analyzing post-flowback water production:An Eagle Ford black-oil case[R].URTEC-2019-989-MS,2019.
• [16]庞彦明，王永卓，王瑞，等.松辽盆地古龙页岩油水平井试采分析及产能预测[J].大庆石油地质与开发，2020,39(3):137-146.PANG Yanming,WANG Yongzhuo,WANG Rui,et al. Production test analysis and productivity prediction of horizontal wells in Gulong shale oil reservoirs,Songliao Basin[J]. Petroleum Geology&Oilfield Development in Daqing, 2020, 39(3):137-146.
• [17]邵红梅，高波，洪淑新，等.页岩油储层实验技术进展及应用：以松辽盆地古龙地区为例[J].大庆石油地质与开发，2020,39(3):97-106.SHAO Hongmei,GAO Bo,HONG Shuxin,et al. Progress and application of the experimental technologies for the shale oil reservoirs:A case study on Gulong area in Songliao Basin[J]. Petroleum Geology&Oilfield Development in Daqing, 2020, 39(3):97-106.