刘刚,杨东,梅显旺,于书新,马威奇,范学君
LIU Gang,YANG Dong,MEI Xianwang,YU Shuxin,MA Weiqi,FAN Xuejun

• 1:大庆油田有限责任公司试油试采分公司
• 2:大庆油田有限责任公司勘探事业部

摘要(Abstract)：

松辽盆地页岩油藏丰富,与致密砂岩储层相比,页岩油储层微—纳米孔隙发育,孔喉细小,孔隙结构复杂,需要采取更大规模的压裂增产措施。由于页岩油储层渗流复杂特殊,要取得理想的产油效果,不仅需要选择好甜点和压裂改造措施,更需要优化压裂后生产方式。通过对井A页岩油岩心进行实验分析,结合渗流理论与放喷理论等方法,探索优化了页岩油压裂后闷井控排制度。根据岩心实验结果,初步形成了古龙页岩油压裂后闷井时间优化方法,充分利用压裂能量,确保压裂后油水渗吸置换效果;引入"油嘴系数"概念,实现放喷产量与井口压力、油嘴大小有效匹配,降低页岩油储层压敏效应。应用效果表明,在页岩油井压裂后采用闷井控排方式求产,能够充分利用压裂能量,促进油水置换,降低见油返排率,提高单井产能。
Shale oil reservoirs are rich in Songliao Basin. Compared with the tight sandstone reservoirs, the micro-nano pores are well developed in the shale oil reservoirs, the pores and throats are rather small and their pore structures are rather complex, so it needs to take more large-scale fracturing and stimulating measures. Due to the complexity and particularity of the shale oil reservoir seepage, in order to achieve the ideal oil-production effects, it is not only necessary to select the sweet spots and fracturing stimulation, but also to optimize the producing mode of the post fracturing. Through the analysis of the shale oil core experiment for Well A,combined with the seepage theory and blowout theory, the well-soaking and controlled flowback system after the shale oil resen fracturing was explored and optimized. According to the core test results, the optimizing method of the well soaking time after the fracturing has been preliminarily established, which makes full use of the fracturing energy,and the effects of the oil-water imbibition and replacement after the fracturing have ensured; with the help of the introduction of the concept of "choke efficient", the matches between the blowout production,the wellhead pressure and the choke size have been well realized, thus the pressure-sensitivity effect of the shale oil reservoirs has been reduced. The applied results show that the sought postfrac production of the shale oil well by means of the well-soaking and controlled flowback technique can make full use of the fracturing energy, promote oil-water replacement, reduce the flowback rate of the oil presentation and enhance the productivity of the individual well.

关键词(KeyWords)： 古龙页岩油;岩心实验;闷井控排;渗流理论
Gulong shale oil;core experiment;well-soaking and controlled flowback technique;seepage theory

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份公司重大科技专项“松辽盆地北部石油精细勘探技术完善与规模增储”(2016E-0201)

作者(Author): 刘刚,杨东,梅显旺,于书新,马威奇,范学君
LIU Gang,YANG Dong,MEI Xianwang,YU Shuxin,MA Weiqi,FAN Xuejun

DOI: 10.19597/J.ISSN.1000-3754.202004062

参考文献(References)：

• [1]霍秋立,曾花森,付丽,等.松辽盆地北部青一段泥页岩储集特征及孔隙演化[J].大庆石油地质与开发,2019,38(1):1-8.HUO Qiuli,ZENG Huasen,FU Li,et al.Accumulating characteristics and pore evolution for Member Qing-1 mud shale in North Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2019,38 (1):1-8.
• [2]任颖惠,闫明琦,李闻虚,等.松辽盆地齐家—古龙凹陷泥页岩特征及成藏期次[J].成都理工大学学报(自然科学版),2019,46(6):660-666.REN Yinghui,YAN Mingqi,LI Wenxu,et al.Study on shale characteristics and reservoir accumulation period in Qijia-Gulong Depression ,Songliao Basin,China[J]Journal of Chengdu University of Technology(Science & Technology Edition),2019,46(6):660-666.
• [3]吴河勇,林铁锋,白云风,等.松辽盆地北部泥(页)岩油勘探潜力分析[J].大庆石油地质与开发,2019,38(5):78-86.WU Heyong LIN Tiefeng,BAI Yunfeng,et al.Analyses of the mudstone (shale) oil exploration potential in North Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2019,38(5):78-86.
• [4]YAICH E,WILLIAMS S,BOWSER A,et al.A case study:The impact of soaking on well performance in the Marcellus[C].San Antonio:The Unconventional Resources Technology Conference,2015.
• [5]ZHANG Yanjun,GE Hongkui,SHEN Yinghao,et al.Evaluating the potential for oil recovery by imbibition and time-delay effect in tight reservoirs during shut-in[J].Journal of Petroleum Science and Engineering,2020,184:1-8.
• [6]高之业,范毓鹏,胡钦红,等.川南地区龙马溪组页岩有机质孔隙差异化发育特征及其对储集空间的影响[J].石油科学通报,2020,5(1):1-16.GAO Zhiye,FAN Yupeng,HU Qinhong,et al.Differential development characteristics of organic matter pores and their impact on reservoir space of Longmaxi Formation shale from the south Sichuan Basin[J].Petroleum Science Bulletin,2020,5(1):1-16.
• [7]刘曰武,高大鹏,李奇,等.页岩气开采中的若干力学前沿问题[J].力学进展,2019,49(1):1-236.LIU Yuewu,GAO Dapeng,LI Qi,et al.Mechanical frontiers in shale-gas development[J].Advances in Mechanics,2019,49(1):1-236.
• [8]任岚,邸云婷,赵金洲,等.页岩气藏压裂液返排理论与技术研究进展[J].大庆石油地质与开发,2019,38(2):144-152.REN Lan,DI Yunting,ZHAO Jinzhou,et al.Advances in the theory and technique of the fracturing fluid flowback in shale gas reservoirs[J].Petroleum Geology & Oilfield Development in Daqing,2019,38(2):144-152.
• [9]SHEN Yinghao,ZHU Zhaopeng,SHI Peng,et al.Ion diffusion behavior between fracturing water and shale and its potential influence on production[J].Journal of Chemistry,2017:1-7.
• [10]CAI Jianchao,LI Caoxiong,SONG Kaoping,et al.The influence of salinity and mineral components on spontaneous imbibition in tight sandstone[J].Fuel,2020:1-8.
• [11]蒙冕模,葛洪魁,纪文明,等.基于核磁共振技术研究页岩自发渗吸过程[J].特种油气藏,2015,22(5):137-140MENG Mianmo,GE Hongkui,JI Wenming,et al.NMR study on shale spontaneous imbibition[J].Special Oil & Gas Reservoirs,2015,22(5):137-140.
• [12]申颍浩,葛洪魁,宿帅,等.页岩气储层的渗吸动力学特性与水锁解除潜力[J].中国科学:物理学、力学、天文学,2017,47(11):84-94.SHEN Yinghao,GE Hongkui,SU Shuai,et al.Imbibition characteristic of shale gas formation and water-block removal capability[J].Scientia Sinica Physica,Mechanica & Astronomica,2017,47(11):84-94.
• [13]SCHMID K S,GEIGER S.Universal scaling of spontaneous imbibition for arbitrary petrophysical properties:Water-wet and mixed-wet states and Handy's conjecture[J].Journal of Petroleum Science and Engineering,2013,101:44-61,18.
• [14]王怒涛,陈仲良,祝明谦,等.页岩气压裂水平井产量递减组合模型分析[J].大庆石油地质与开发,2018,37(5):135-140.WANG Nutao,CHEN Zhongliang,ZHU Mingqian,et al.Analysis of the combined model for the production decline of the shale-gas fractured horizontal well[J].Petroleum Geology & Oilfield Development in Daqing,2018,37(5):135-140.
• [15]刘杰.中浅层产气井试油(气)方法探讨[J].油气井测试,2011,20(6):31-32,36.LIU Jie.Discuss on oil(gas) testing method for middle or shallow depth of oil produced well[J].Well Testing,2011,20(6):31-32,36.