Fracturing Technologies for Horizontal Wells in the Second-Class Shale Oil Reservoirs of the Lower Sweet Spot Areas in Jimusar
-
摘要: 为了解决准噶尔盆地吉木萨尔页岩油因其流度低和储层层理发育缝高受限导致水平井提产困难的问题，提高下甜点二类储层的有效动用程度，开展了密切割改造提升缝控程度、薄互层穿层压裂增加纵向动用程度技术攻关。研究了密切割改造技术，将平均簇间距缩短至13.6 m，大幅提高了页岩储层缝控程度；提高了直井压裂施工的排量及冻胶用量，验证了下甜点二类储层具备穿层压裂的可行性，形成了以水平井12～14 m3/min大排量、冻胶和滑溜水多段塞泵注、中小粒径支撑剂组合和2.7 m3/m高加砂强度等为核心的穿层压裂关键技术，保证了层理转折裂缝有效支撑。现场试验表明，该技术能够提高水平井压裂动用体积，二类储层试验水平井压裂后第1年累计产油量达9 183 t，是前期水平井产油量的3倍以上。研究结果表明，水平井密切割穿层压裂技术可以解决二类储层多薄油层难动用的问题，为页岩油二类区有效动用提供了新的技术途径。Abstract: Technical research was carried out to enhance fracture control in fracturing with tight spacing and boost longitudinal production by cross layer fracturing in thin interbeddings. The research aims to address the difficult enhancement of horizontal well production induced by low fluidity and limited fracture height in beddings of the shale oil reservoirs in Jimusaer, Junggar Basin, and improve the production in the second-class shale oil reservoirs of the lower sweet spot areas in this region. The technique of fracturing with tight spacing was studied, with the average inter-cluster spacing reduced to 13.6 m, greatly strengthening the fracture control in shale oil reservoirs. The displacement and gel amount during vertical well fracturing were increased, and the feasibility of cross layer fracturing in the second-class reservoirs of the lower sweet spot areas was verified. As a result, the key technologies of cross layer fracturing, featured by large displacement (12–14 m3/min) in horizontal wells, multi-slug pumping of gel and slick water, proppant integrating medium and small particle sizes, and large sand addition (2.7 m3/m), were developed to provide strong support against the turning fractures in beddings.The annual cumulative oil production of the horizontal test wells in the second-class reservoirs achieved 9 183 t, more than three times that of previous horizontal wells.The field test demonstrates that the technologies can enlarge the fracturing volume in horizontal wells.The research results show that the cross layer fracturing with tight spacing for horizontal wells can solve the production problem of multiple thin oil layers in the second-class reservoirs and provide a new technical approach for the fracturing production of horizontal wells in such reservoirs.
-
Key words:
- shale oil /
- horizontal well /
- bedding /
- thin interbedding /
- tightspacing /
- volumetric fracturing /
- cross layer fracturing /
- Jimusaer
-
图 1 不同簇间距的压力波及范围模拟结果
Figure 1. Simulation results of pressure sweep range with different inter-cluster spacing
图 2 不同簇间距下第1年累计产油量预测结果
Figure 2. Forecast of annual cumulative oil production with different inter-cluster spacing
表 1 JA2井测试验窜施工参数
Table 1. Construction parameters of the channeling test in Well JA2
测试阶段 时间 油管（目的层2 773.50～2 776.50 m） 套管（目的层2 762.00～2 768.00 m） 结论 工作状况 抽汲液面/m 产液量/m3 工作状况 套管压力/MPa 产液量/m3 第1阶段 第1天 抽汲 1 250 6.34 关井 2.3 0 两层未窜通 第2天 抽汲 1 565 7.22 关井 2.6 0 第3天 抽汲 1 570 5.11 关井 3.0 0 第4天 抽汲 1 560 3.34 关井 3.2 0 第2阶段 第5天 测液面 1 490 0 开井 0 14.60 两层未窜通 第6天 测液面 1 430 0 开井 0 13.55 第7天 测液面 1 380 0 开井 0 12.67 第8天 测液面 1 330 0 开井 0 12.49 第3阶段 第9天 测液面 1 290 0 加压6次 10.0 0 两层未窜通 
下载: 导出CSV
表 2 试验井施工参数及阵列声波测井解释结果
Table 2. Construction parameters of the test wells and interpretation results of array acoustic logging
井号 井段/m 隔层应力差/MPa 隔层厚度/m 冻胶排量/（m3·min–1） 冻胶用量/m3 解释缝高/m 解释缝高范围/m JB1 3 498～3 502 8.0 2.0 10.0 594.0 43 3 467～3 510 JB2 2 944～2 954 5.0 2.0 8.6 510.0 15 2 943～2 958 JB3 3 279～3 283 5.0 1.0 10.0 420.8 19 3 268～3 287
下载: 导出CSV
-
[1] 高阳,叶义平,何吉祥,等. 准噶尔盆地吉木萨尔凹陷陆相页岩油开发实践[J]. 中国石油勘探,2020,25(2):133–141. doi: 10.3969/j.issn.1672-7703.2020.02.013GAO Yang, YE Yiping, HE Jixiang, et al. Development practice of continental shale oil in Jimsar sag in the Junggar Basin[J]. China Petroleum Exploration, 2020, 25(2): 133–141. doi: 10.3969/j.issn.1672-7703.2020.02.013 [2] 郭旭光,何文军,杨森,等. 准噶尔盆地页岩油 “甜点区” 评价与关键技术应用:以吉木萨尔凹陷二叠系芦草沟组为例[J]. 天然气地球科学,2019,30(8):1168–1179. doi: 10.11764/j.issn.1672-1926.2019.05.020GUO Xuguang, HE Wenjun, YANG Sen, et al. Evaluation and application of key technologies of “sweet area” of shale oil in Junggar Basin: case study of Permian Lucaogou Formation in Jimusar Depression[J]. Natural Gas Geoscience, 2019, 30(8): 1168–1179. doi: 10.11764/j.issn.1672-1926.2019.05.020 [3] 许琳,常秋生,杨成克,等. 吉木萨尔凹陷二叠系芦草沟组页岩油储层特征及含油性[J]. 石油与天然气地质,2019,40(3):535–549. doi: 10.11743/ogg20190309XU Lin, CHANG Qiusheng, YANG Chengke, et al. Characteristics and oil-bearing capability of shale oil reservoir in the Permian Lucaogou Formation,Jimusaer sag[J]. Oil & Gas Geology, 2019, 40(3): 535–549. doi: 10.11743/ogg20190309 [4] 闫林,陈福利,王志平,等. 我国页岩油有效开发面临的挑战及关键技术研究[J]. 石油钻探技术,2020,48(3):63–69. doi: 10.11911/syztjs.2020058YAN Lin, CHEN Fuli, WANG Zhiping, et al. Challenges and technical countermeasures for effective development of shale oil in China[J]. Petroleum Drilling Techniques, 2020, 48(3): 63–69. doi: 10.11911/syztjs.2020058 [5] 匡立春,侯连华,杨智,等. 陆相页岩油储层评价关键参数及方法[J]. 石油学报,2021,42(1):1–14. doi: 10.7623/syxb202101001KUANG Lichun, HOU Lianhua, YANG Zhi, et al. Key parameters and methods of lacustrine shale oil reservoir characterization[J]. Acta Petrolei Sinica, 2021, 42(1): 1–14. doi: 10.7623/syxb202101001 [6] 吴宝成,李建民,邬元月,等. 准噶尔盆地吉木萨尔凹陷芦草沟组页岩油上甜点地质工程一体化开发实践[J]. 中国石油勘探,2019,24(5):679–690. doi: 10.3969/j.issn.1672-7703.2019.05.014WU Baocheng, LI Jianmin, WU Yuanyue, et al. Development practices of geology-engineering integration on upper sweet spots of Lucaogou Formation shale oil in Jimsar Sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(5): 679–690. doi: 10.3969/j.issn.1672-7703.2019.05.014 [7] 苏皓,雷征东,张荻萩,等. 致密油藏体积压裂水平井参数优化研究[J]. 岩性油气藏,2018,30(4):140–148.SU Hao, LEI Zhengdong, ZHANG Diqiu, et al. Volume fracturing parameters optimization of horizontal well in tight reservoir[J]. Lithologic Reservoirs, 2018, 30(4): 140–148. [8] 李立,庞江平,瞿子易. 钻探现场矿物自动化分析技术进展及应用前景[J]. 天然气工业,2018,38(6):46–52. doi: 10.3787/j.issn.1000-0976.2018.06.006LI Li, PANG Jiangping, QU Ziyi. Progress and application prospect of on-site automatic mineral analysis technologies[J]. Natural Gas Industry, 2018, 38(6): 46–52. doi: 10.3787/j.issn.1000-0976.2018.06.006 [9] 唐谢,唐家琼,庞江平,等. 长宁地区页岩储集层录井随钻解释评价方法[J]. 录井工程,2015,26(4):11–16. doi: 10.3969/j.issn.1672-9803.2015.04.003TANG Xie, TANG Jiaqiong, PANG Jiangping, et al. Interpretation and evaluation method of mud logging while drilling for shale reservoir in Changning Area[J]. Mud Logging Engineering, 2015, 26(4): 11–16. doi: 10.3969/j.issn.1672-9803.2015.04.003 [10] 卢宇,赵志恒,李海涛,等. 页岩储层多簇限流射孔裂缝扩展规律[J]. 天然气地球科学,2021,32(2):268–273.LU Yu, ZHAO Zhiheng, LI Haitao, et al. Study on the law of fracture propagation from multiple cluster limited entry perforation in shale reservoir[J]. Natural Gas Geoscience, 2021, 32(2): 268–273. [11] 许江文,李建民,邬元月,等. 玛湖致密砾岩油藏水平井体积压裂技术探索与实践[J]. 中国石油勘探,2019,24(2):241–249.XU Jiangwen, LI Jianmin, WU Yuanyue, et al. Exploration and practice of horizontal well volume fracturing technology in Mahu tight conglomerate reservoir[J]. China Petroleum Exploration, 2019, 24(2): 241–249. [12] 刘合,匡立春,李国欣,等. 中国陆相页岩油完井方式优选的思考与建议[J]. 石油学报,2020,41(4):489–496. doi: 10.7623/syxb202004011LIU He, KUANG Lichun, LI Guoxin, et al. Considerations and suggestions on optimizing completion methods of continental shale oil in China[J]. Acta Petrolei Sinica, 2020, 41(4): 489–496. doi: 10.7623/syxb202004011 [13] 苏勤芹. 吉木萨尔凹陷致密油烃源岩测井评价及储层物性研究[D]. 北京: 中国地质大学（北京）, 2016.SU Qinqin. Study of well logging evaluation of hydrocarbon source rocks and reservoir physical properties characteristics of tight oil in Jimusar depression[D]. Beijing: China University of Geo-sciences (Beijing), 2016. [14] 刘丽,闵令元,孙志刚,等. 济阳坳陷页岩油储层孔隙结构与渗流特征[J]. 油气地质与采收率,2021,28(1):106–114.LIU Li, MIN Lingyuan, SUN Zhigang, et al. Pore structure and percolation characteristics in shale oil reservoir of Jiyang Depres-sion[J]. Petroleum Geology and Recovery Efficiency, 2021, 28(1): 106–114. [15] 杨成亮. 页岩油藏非线性渗流特征研究[D]. 成都: 西南石油大学, 2019.YANG Chengliang. Study on the nonlinear seepage characteristics of shale reservoir[D]. Chengdu: Southwest Petroleum University, 2019. [16] 刘礼军,姚军,孙海,等. 考虑启动压力梯度和应力敏感的页岩油井产能分析[J]. 石油钻探技术,2017,45(5):84–91.LIU Lijun, YAO Jun, SUN Hai, et al. The effect of threshold pressure gradient and stress sensitivity on shale oil reservoir productivity[J]. Petroleum Drilling Techniques, 2017, 45(5): 84–91. [17] 李准,吴晓东,韩国庆,等. 考虑裂缝导流能力时效性的多级压裂水平井产能半解析模型[J]. 石油钻采工艺,2019,41(3):354–362.LI Zhun, WU Xiaodong, HAN Guoqing, et al. Semi-analytical model of multi-stage fractured horizontal well productivity considering time-dependent fracture conductivity[J]. Oil Drilling & Production Technology, 2019, 41(3): 354–362. [18] 狄伟. 支撑剂在裂缝中的运移规律及铺置特征[J]. 断块油气田,2019,26(3):355–359.DI Wei. Migration law and placement characteristics of proppant in fractures[J]. Fault-Block Oil & Gas Field, 2019, 26(3): 355–359. -
点击查看大图
图(4) / 表ll (2)
计量
- 文章访问数: 167
- HTML全文浏览量: 63
- PDF下载量: 68
- 被引次数: 0
京公网安备 11010502036328号 