基于脉冲注入理论的页岩储层微破裂试井解释技术及应用
Mini-frac test interpretation for shale reservoirs based on impulse injection theory and its application
- 2022年43卷第1期 页码:241-250
收稿:2020-08-06,
修回:2021-11-22,
纸质出版:2022-02-01
DOI: 10.11743/ogg20220120
移动端阅览
收稿:2020-08-06,
修回:2021-11-22,
纸质出版:2022-02-01
移动端阅览
微破裂测试可以获取页岩储层大规模体积压裂之前的物性参数,为资源量计算以及地质、工程双“甜点”的评价提供关键信息。目前基于常规关井压力恢复试井理论的解释方法在处理微破裂测试这类“短暂注入、长期关井”的特殊问题时精度低,且常出现流态无法识别及参数难以诊断的问题。结合微破裂测试的特殊性,提出了一种基于脉冲注入理论的页岩储层微破裂试井解释方法,即将开井注入和关井压降过程看作整体,假设关井后的压力响应是注入期和关井期的总和,在渗流数学模型的内边界条件处考虑,从而建立微破裂试井解释模型。求解得到压力动态曲线,通过敏感性分析明确各参数对测试曲线的影响。之后通过渐进分析得到测试曲线关键段压力解,据此引入3条组合诊断线,用以获取测试曲线上的流态信息,并在不同流态下解释对应的参数,最终建立了主控流态识别+特种直线分析的微破裂试井解释方法和流程。利用该方法对涪陵页岩气田南川区块平桥背斜不同构造部位两口测试井进行了分析解释,验证了方法的实用性,解释结果为认识该区页岩含气性提供了依据,并正确预测了不同构造部位气井压裂效果将存在分区差异,为之后正确划定甜点区和优先部署区提供了指导,后续试气和试采动态进一步证明了结果可靠性。
Mini-frac tests can be used to evaluate the physical property of shale reservoirs prior to large-scale fracturing, and provide key parameters for resource quantity calculation and evaluation of sweet spots both in geology and engineering. As of now, the well testing interpretation based on conventional shut-in pressure recovery has a very low accuracy in dealing with special issues like mini-frac test, featuring “short-term injection and long-term shut-in”, often accompanied by difficulties in flow pattern identification and parameter diagnosis. In view of the particularity of mini-frac test, the study proposes a well testing interpretation method based on pulse injection theory, where the process of injection and shut-in pressure drop is regarded as a whole, the shut-in pressure response is assumed to be the result of both injection and shut-in periods as considered at the inner boundary of mathematical diffusion-filtration model, and then a mini-frac test interpretation model is established. A pressure dynamic curve is calculated, and the influence of the parameters on the test curve is determined through sensitivity analysis. Pressure of key sections of the test curve is obtained through asymptotic solution, and 3 combined diagnostic curves are introduced to obtain the flow regime information. Finally, an interpretation method and process by mini-frac tests is established with parameter interpretation made for different flow regimes, including dominant flow regime identification and special straight line analysis. This method is then applied to analyze two wells located at different structural positions of Pingqiao anticline in Nanchuan block, Fuling shale gas field, through which its practicality is verified. The interpretation results serve to provide basis for understanding the gas-bearing potential of shale in the area, and predict the regional differences of fracturing effect successfully, which is of guiding value to future delineation of sweet spot zone and development zone of priority. The subsequent production tests also verify the reliability of the results obtained.
Kuhlman R D . Microfrac tests optimize frac jobs [J]. International Journal of Rock Mechanics & Mining sciences & Geomechanics Abstracts , 1990 , 27 ( 4 ): 45 - 49 .
Detournay E , Cheng H D , Roegiers J C , et al . Poroelasticity considerations in in situ stress determination by hydraulic fracturing [J]. International Journal of Rock Mechanics & Mining sciences & Geomechanics Abstracts , 1989 , 26 ( 6 ): 507 - 513 .
周彤 , 苏建政 , 李凤霞 , 等 . 基于停泵压力降落曲线分析的压后裂缝参数反演 [J]. 天然气地球科学 , 2019 , 30 ( 11 ): 1646 - 1654 .
Zhou Tong , Su Jianzheng , Li Fengxia , et al . An approach to estimate hydraulic fracture parameters with the pressure falloff data of main treatment [J]. Natural Gas Geoscience , 2019 , 30 ( 11 ): 1646 - 1654 .
曾博 , 王莉 , 张晓伟 . 小型压裂测试分析方法在页岩气开发中的应用 [J]. 科学技术与工程 , 2014 , 14 ( 8 ): 151 - 155 .
Zeng Bo , Wang Li , Zhang Xiaowei . Application of min⁃frac analysis in the development of shale plays [J]. Science Technology and Engineering , 2014 , 18 ( 8 ) : 151 - 154 .
任建华 . 微注入压降测试在页岩气储层评价中的应用 [J]. 科学技术与工程 , 2018 , 18 ( 30 ): 70 - 74 .
Ren Jianhua . Application of pre⁃frac injection falloff diagnostic test in evaluation of shale gas reservoir [J]. Science Technology and Engineering , 2018 , 18 ( 30 ): 70 - 74 .
李晓 , 赫建明 , 尹超 , 等 . 页岩结构面特征及其对水力压裂的控制作用 [J]. 石油与天然气地质 , 2019 , 40 ( 3 ): 653 - 660 .
Li Xiao , He Jianming , Yin Chao , et al . Characteristics of the shale bedding planes and their control on hydraulic fracturing [J]. Oil & Gas Geology , 2019 , 40 ( 3 ): 653 - 660 .
段永刚 , 李建秋 . 页岩气无限导流压裂井压力动态分析 [J]. 天然气工业 , 2010 , 30 ( 10 ): 26 - 29 .
Duan Yonggang , Li Jianqiu . Transient pressure analysis of infinite conductivity fractured wells for shale gas [J]. Natural Gas Industry , 2010 , 30 ( 10 ): 26 - 29 .
刘晓旭 , 杨学锋 , 陈远林 , 等 . 页岩气分段压裂水平井渗流机理及试井分析 [J]. 天然气工业 , 2013 , 33 ( 12 ): 77 - 81 .
Liu Xiaoxu , Yang Xuefeng , Chen Yuanlin , et al . Seepage behavi⁃or and well testing in horizontal shale gas wells under multistage fracking [J]. Natural Gas Industry , 2013 , 33 ( 12 ): 77 - 81 .
欧阳伟平 , 孙贺东 , 韩红旭 . 致密气藏水平井多段体积压裂复杂裂缝网络试井解释新模型 [J]. 天然气工业 , 2020 , 40 ( 3 ): 74 - 81 .
Ouyang Weiping , Sun Hedong , Han Hongxu . A new well test interpretation model for complex fracture networks in horizontal wells with multi⁃stage volume fracturing in tight gas reservoirs [J]. Natural Gas Industry , 2020 , 40 ( 3 ): 74 - 81 .
Abousleiman Y , Cheng H D , Gu H . Formation permeability determination by Micro or Mini⁃Hydraulic Fracturing [J]. Journal of Ene⁃rgy Resources Technology , 1994 , 116 ( 2 ): 104 - 114 .
Soliman M Y . Analysis of buildup tests with short producing time [J]. SPE Formation Evaluation , 1986 , 1 ( 4 ): 363 - 371 .
张逸群 , 余刘应 , 张国锋 . 基于微注入压降测试的页岩气储层快速评价方法 [J]. 石油钻探技术 , 2017 , 45 ( 3 ): 107 - 112 .
Zhang Yiqun , Yu Liuying , Zhang Guofeng . Rapid evaluation of shale reservoirs based on pre⁃frac injection/falloff diagnostic test [J]. Petroleum Drilling Techniques , 2017 , 45 ( 3 ): 107 - 112 .
Bourdet D , Ayoub J A , Pirard Y M . Use of pressure derivative in well test interpretation [J]. SPE Formation Evaluation , 1989 , 4 ( 2 ): 293 - 302 .
Horner D . R. Pressure build⁃up in wells [C]// Proceedings of the 3rd world petroleum congress . Hague : 1951 : 25 - 43 .
Nolte K G . Determination of Fracture Parameters from Fracturing Pressure Decline [C]// SPE Annual Technical Confere⁃nce and Exhibition , Las Vegas : 1979 : SPE-8341-MS.
聂海宽 , 张柏桥 , 刘光祥 , 等 . 四川盆地五峰组-龙马溪组页岩气高产地质原因及启示——以涪陵页岩气田JY6⁃2HF为例 [J]. 石油与天然气地质 , 2020 , 41 ( 3 ): 463 - 473 .
Nie Haikuan , Zhang Baiqiao , Liu Guangxiang , et al . Geological factors contributing to high shale gas yield in the Wufeng⁃Longmaxi Fms of Sichuan Basin: A case study of Well JY6-2HF in Fuling shale gas field [J]. Oil & Gas Geology , 2020 , 41 ( 3 ): 463 - 473 .
廖东良 , 路保平 . 页岩气工程甜点评价方法——以四川盆地焦石坝页岩气田为例 [J]. 天然气工业 , 2018 , 38 ( 2 ): 43 - 50 .
Liao Dongliang , Lu Baoping . An evaluation method of engineering sweet spots of shale gas reservoir development: A case study from the Jiaoshiba gas field, Sichuan Basin [J]. Natural Gas Industry , 2018 , 38 ( 2 ): 43 - 50 .
汪虎 , 何治亮 , 张永贵 , 等 . 四川盆地海相页岩储层微裂缝类型及其对储层物性影响 [J]. 石油与天然气地质 , 2019 , 40 ( 1 ): 41 - 49 .
Wang Hu , He Zhiliang , Zhang Yonggui , et al . Microfracture types of marine shale reservoir of Sichuan Basin and its influence on reservoir property [J]. Oil & Gas Geology , 2019 , 40 ( 1 ): 41 - 49 .
马永生 , 黎茂稳 , 蔡勋育 , 等 . 中国海相深层油气富集机理与勘探开发:研究现状、关键技术瓶颈与基础科学问题 [J]. 石油与天然气地质 , 2020 , 41 ( 4 ): 655 - 672 , 683 .
Ma Yongsheng , Li Maowen , Cai Xunyu , et al . Mechanisms and exploitation of deep marine petroleum accumulations in China: Advances, technological bottlenecks and basic scientific problems [J]. Oil & Gas Geology , 2020 , 41 ( 4 ): 655 - 672 , 683 .
郭旭升 , 胡东风 , 李宇平 , 等 . 涪陵页岩气田富集高产主控地质因素 [J]. 石油勘探与开发 , 2017 , 44 ( 4 ): 481 - 491 .
Guo Xusheng , Hu Dongfeng , Li Yuping , et al . Geological factors controlling shale gas enrichment and high production in Fuling shale gas field [J]. Petroleum Exploration and Development , 2017 , 44 ( 4 ): 481 - 491 .
李金磊 , 尹成 , 王明飞 , 等 . 四川盆地涪陵焦石坝地区保存条件差异性分析 [J]. 石油实验地质 , 2019 , 41 ( 3 ): 341 - 347 .
Li Jinlei , Yin Cheng , Wang Mingfei , et al . Preservation condition differences in Jiaoshiba area, Fuling,Sichuan Basin [J]. Petroleum Geology & Experiment , 2019 , 41 ( 3 ): 341 - 347 .
Soliman M Y , Miranda C , Wang H M , et al . Investigation of effect of fracturing fluid on after⁃closure analysis in gas reservoirs [C]// North Africa Technical Conference and Exhibition . Cairo : 2010 :SPE-128016-MS.
Valko P , Abate J . Comparison of sequence accelerators for the Gaver method of numerical Laplace transform inversion [J]. Computers & Mathematics with Applications , 2004 , 48 ( 3-4 ): 629 - 636 .
王超 , 张柏桥 , 舒志国 , 等 . 四川盆地涪陵地区五峰组-龙马溪组海相页岩岩相类型及储层特征 [J]. 石油与天然气地质 , 2018 , 39 ( 3 ): 485 - 497 .
Wang Chao , Zhang Boqiao , Shu Zhiguo , et al . Lithofacies types and reservoir characteristics of marine shales of the Wufeng Formation⁃Longmaxi Formation in Fuling area,the Sichuan Basin [J]. Oil & Gas Geology , 2018 , 39 ( 3 ): 485 - 497 .
田鹤 , 曾联波 , 徐翔 , 等 . 四川盆地涪陵地区海相页岩天然裂缝特征及对页岩气的影响 [J]. 石油与天然气地质 , 2020 , 41 ( 3 ): 474 - 483 .
Tian He , Zeng Lianbo , Xu Xiang , et al . Characteristics of natural fractures in marine shale in Fuling area,Sichuan Basin, and their influence on shale gas [J]. Oil & Gas Geology , 2020 , 41 ( 3 ): 474 - 483 .
高岗 , 黄志龙 , 王兆峰 , 等 . 地层异常高压形成机理的研究 [J]. 西安石油大学学报(自然科学版) , 2005 , 20 ( 1 ): 1 - 7 .
Gao Gang , Huang Zhilong , Wang Zhaofeng , et al . Study on the mechanisms of the formation of formation abnormal high⁃pressure [J]. Journal of Xi'an Shiyou University (Natural Science Edition) , 2005 , 20 ( 1 ): 1 - 7 .
孙健 , 罗兵 . 四川盆地涪陵页岩气田构造变形特征及对含气性的影响 [J]. 石油与天然气地质 , 2016 , 37 ( 6 ): 809 - 818 .
Sun Jian , Luo Bing . Structural deformation and its influences on gas storage in Fuling shale gas play, the Sichuan Basin [J]. Oil & Gas Geology , 2016 , 37 ( 6 ): 809 - 818 .
Li Y , Zhou D , Wang W H , et al . Development of unconventional gas and technologies adopted in China [J]. Energy Geoscience , 2020 , 1( 1 – 2 ): 55 - 68 .
杨振恒 , 韩志艳 , 腾格尔 , 等 . 四川盆地南部五峰组-龙马溪组页岩地质甜点层特征——以威远-荣昌区块为例 [J]. 天然气地球科学 , 2019 , 30 ( 7 ): 1037 – 1044 .
Yang Zhenheng , Han Zhi⁃yan , Tengeer , et al . Characteristics of Wufeng⁃Longmaxi Formations shale sweet layer: Case study of Weiyuan⁃Rongchang Block of SINOPEC [J]. Natural Gas Geoscie⁃nce , 2019 , 30 ( 7 ): 1037 – 1044 .
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