收稿日期: 2016-12-12
修回日期: 2017-03-02
网络出版日期: 2017-06-10
基金资助
国家自然科学基金重大项目(编号:51490654);国家科技重大专项(编号:2016ZX05023;2016ZX05039)联合资助.
Study on the effect of gas-shale reservoir special propertieson the fracturing fluid recovery efficiency and production performance
Received date: 2016-12-12
Revised date: 2017-03-02
Online published: 2017-06-10
相对于常规储层,复杂的储层性质对页岩气井压后返排率高低和产能大小的影响更为显著。基于页岩气井早期生产返排特征,建立气水两相流数值模型,研究不同储层性质[超低含水饱和度、渗透率盲区(Permeability Jail)、润湿性和基质毛管力]对返排率和产能的影响。结果表明:在关井期间,储层“超低含水饱和度”现象导致压裂液大量渗吸,引起储层含水饱和度上升,最终使得初始开井产气量高,返排率低,且原始含水饱和度越低,影响越大;随着储层渗透率盲区程度增大,累产气量逐渐减小,强相渗盲区的储层生产3年仅有1.32×104m3的产气量。无相渗盲区(常规相渗曲线)的储层渗吸能力强,返排率极低(4.74%)。综合认为,弱相渗盲区储层的相渗曲线更适合页岩;储层基质水湿程度的降低会减弱渗吸置换能力,使得累产气量减小,返排率增加;储层基质毛管力的增大将导致渗吸作用加强,造成初始产气量升高,而在长期生产中,气相渗透率受到强渗吸引起的高含水饱和度的阻碍而降低,导致累产气量减少,并伴随着较低的返排率。
张涛,李相方,王永辉,石军太,杨立峰,孙政,杨剑,张增华 . 页岩储层特殊性质对压裂液返排率和产能的影响[J]. 天然气地球科学, 2017 , 28(6) : 828 -838 . DOI: 10.11764/j.issn.1672-1926.2017.05.003
Compared with the conventional reservoir,the complicated property of gas-shale reservoir has a more significant influence on fracturing fluid recovery efficiency(RE) and production performance(PP).A numerical simulation model about early gas-water two-phase flow is established based on the typical data to study the effects of reservoir properties on RE and PP,such as subirreducible water saturation,relative permeability jail,wettability and matrix capillary force.The results,firstly,show that more fluidsareimbibed into the reservoir because of “subirreduciblewater saturation”,resulting in the larger water saturation increment,the higher initial gas production and the lower RE.However,the water saturation of matrix is still higher after 10 days shut-in if the original water saturation is higher at first causing less gas is produced in late stage.Secondly,the cumulative gas production(CGP) decreases with the severity of the “relative permeability jail”,in which the CGP is only 1.32×104m3 after 3 years production.Fewfluid is recovered(4.74%) if a conventional relative permeability is applied.Therefore,the weak relative permeability jail curve is more suitable for the tight reservoirs than other two types of relative permeability curves.What's more,the weak water wet formation reduces the imbibition and replacement leading to the decrease of CGP and the increase of RE.Finally,with the increase of capillary pressure,the higher gas production in early stage and the lower in late stage are revealed because of gas permeability impaired by high water saturation caused by the strong imbibition,resulting in lower CGP and combined with lower RE.
[1]EIA.World Shale Assessment[R].U.S.:U.S.Energy Information Administration,2015.
[2]Waltman C,Warpinski N,Heinze J.Comparison of single and dual array microseismic mapping techniques in the Barnett Shale[J].SEG Technical Program Expanded Abstracts,2005,1(24):1261.
[3]Palisch T,Vincent M,Handren P.Slick water fracturing:Food for thought[J].SPE Production & Operations,2010,25(3):327-344.
[4]Cuss R,Wiseall A,Hennissen J,et al.Hydraulic Fracturing:A Review of Theory and Field Experience[R].British Geological Survey,Keyworth,Nottingham,NG12 5GG,UK,2015.
[5]Nicot J,Scanlon B.Water use for Shale-gas production in Texas,U.S[J].Environmental Science & Technology,2012,46(6):3580-3586.
[6]Singh H.A critical review of water uptake by shales[J].Journal of Natural Gas Science and Engineering,2016,34:751-766.
[7]King G.Hydraulic fracturing 101: What every representative,environmentalist,regulator,reporter,investor,university researcher,neighbor and engineer should know about estimatingfrac risk and improving frac performance in unconventional gas and oil wells[C]//SPE Hydraulic Fracturing Technology Conference.The Woodlands,Texas,USA: Society of Petroleum Engineers,2012.
[8]Vengosh A,Jackson R,Warner N,et al.A critical review of the risks to water resources from unconventional shale gas development and hydraulic fracturing in the United States[J].Environmental Science & Technology,2014,48(15):8334-8348.
[9]Gao Shusheng,Hu Zhiming,Guo Wei,et al.Water absorption characteristics of gas shale and the fracturing fluid capacity[J].Natural Gas Industry,2013,33(12):71-76.[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.]
[10]Bennion D,Thoma F,Bietz R.Low permeability gas reservoirs: problems,opportunities and solutions for drilling,completion,stimulation and production[C]//SPE Gas Technology Symposium.Calgary,Alberta,Canada: Society of Petroleum Engineers,1996.
[11]Fang Chaohe,Huang Zhilong,Wang Qiaozhi,et al.Cause and significance of the ultralow water saturation in gas-enriched shale reservoir[J].Natural Gas Geoscience,2014,25(3):471-476.[方朝合,黄志龙,王巧智,等.富含气页岩储层超低含水饱和度成因及意义[J].天然气地球科学,2014,25(3):471-476.]
[12]Shanley K W,Cluff R M,Robinson J W.Factors controlling prolific gas production from low-permeability sandstone reservoirs:Implications for resource assessment,prospect development,and risk analysis[J].AAPG Bulletin,2004,88(8):1083-1121.
[13]Walters R G H.Impact of fracture conductivity and matrix relative permeability on load Recovery[C]//SPE Annual Technical Conference and Exhibition.Florence,Italy: Society of Petroleum Engineers,2010.
[14]Lan Q,Dehghanpour H,Wood J,et al.Wettability of the montney tight gas formation[J].SPE Reservoir Evaluation & Engineering,2015,18(3):417-431.
[15]Bertoncello A,Wallace J,Blyton C,et al.Imbibition and water blockage in unconventional reservoirs:Well-management implications during flowback and early production[J].SPE Reservoir Evaluation & Engineering,2014,17(4):497-506.
[16]Elgmati M,Zhang H,Bai B,et al.Submicron-pore characterization of shale gas plays[C]//North American Unconventional Gas Conference and Exhibition.The Woodlands,Texas,USA: Society of Petroleum Engineers,2011.
[17]Makhanov K K.An Experimental Study of Spontaneous Imbibition in Horn River Shales[D].Cannada:University of Alberta,2013.
[18]Ghanbari E,Xu M,Dehghanpour H,et al.Advances in understanding liquid flow in gas shales[C]//SPE/CSUR Unconventional Resources Conference-Canada.Calgary,Alberta,Canada: Society of Petroleum Engineers,2014.
[19]Gao Z,Hu Q.Initial water saturation and imbibitibn fluid affect spontaneous imbibition into Barnett shale samples[J].Journal of Natural Gas Science and Engineering,2016,34:541-551.
[20]Dutta R,Lee C,Odumabo S,et al.Quantification of fracturing fluid migration due to spontaneous imbibition in fractured tight formations[C]//SPE Americas Unconventional Resources Conference.Pittsburgh,Pennsylvania USA: Society of Petroleum Engineers,2012.
[21]Wang M,Leung J Y.Numerical investigation of fluid-loss mechanisms during hydraulic fracturing flow-back operations in tight reservoirs[J].Journal of Petroleum Science and Engineering,2015,133:85-102.
[22]Clarkson C,Williams-Kovacs J.Modeling two-phase flowback of multifractured horizontal wells completed in shale[J].SPE Journal,2013,18(4):795-812.
[23]Holditch A S.Factors affecting water blocking and gas flow from hydraulically fractured gas wells[J].Journal of Petroleum Technology,1979,31(12):1515-1524.
[24]Cheng Y.Impact of water dynamics in fractures on the performance of hydraulically fractured wells in gas-shale reservoirs[J].Journal of Canada Petroleum Technology,2012,51(2):143-151.
[25]Rubin B.Accurate simulation of non-darcy flow in stimulated fractured shale reservoirs[C]//SPE Western Regional Meeting.Anaheim,California,USA: Society of Petroleum Engineers,2010.
[26]Wattenbarger R,Alkouh A.New advances in shale reservoir analysis using flowback data[C]//SPE Eastern Regional Meeting.Pittsburgh,Pennsylvania,USA: Society of Petroleum Engineers,2013.
[27]Warren J,Root P.The Behavior of Naturally Fractured Reservoirs[J].SPE Journal,1963,3(3):245-255.
[28]Cipolla C,Lolon E,Erdle J,et al.Modeling well performance in shale-gas reservoirs[C] //SPE/EAGE Reservoir Characterization and Simulation Conference.Abu Dhabi,UAE: ociety of Petroleum Engineers,2009.
[29]Fakcharoenphol P,Torcuk M,Kazemi H,et al.Effect of shut-in time on gas flow rate in hydraulic fractured shale reservoirs[J].Journal of Natural Gas Science and Engineering,2016,32:109-121.
[30]Leung J,Yue M,Dehghanpour H.Integration of numerical simulations for uncertainty analysis of transient flow responses in heterogeneous tight reservoirs[C]//SPE Unconventional Resources Conference Canada.Calgary,Alberta,Canada: Society of Petroleum Engineers,2013.
[31]Li Y,Li X,Teng S,et al.Improved models to predict gas-water relative permeability in fractures and porous media[J].Journal of Natural Gas Science and Engineering,2014,19:190-201.
[32]Gdanski R,Fulton D,Shen C.Fracture-face-skin evolution during cleanup[J].SPE Production & Operations,2009.
[33]Jurus W J,Whitson C H,Golan M.Modeling water flow in hydraulically-fractured shale wells[C]//SPE Annual Technical Conference and Exhibition.New Orleans,Louisiana,USA: Society of Petroleum Engineers,2013.
[34]Bachman R,Sen V,Khalmanova D,et al.Examining the effects of stress dependent reservoir permeability on stimulated horizontal montney gas wells[C]//Canadian Unconventional Resources Conference.Calgary,Alberta,Canada: Society of Petroleum Engineers,2011.
[35]Zhu Weiyao,Ma Dongxu,Zhu Huayin,et al.Stress sensitivity of shale gas reservoir and influence on productivity[J].Natural Gas Geoscience,2016,27(5):892-897.[朱维耀,马东旭,朱华银,等.页岩储层应力敏感性及其对产能影响[J].天然气地球科学,2016,27(5):892-897.]
[36]Frederick D,Graves R.New correlations to predict non-darcy flow coefficients at immobile and mobile water saturation[C]//SPE Annual Technical Conference and Exhibition.New Orleans,Louisiana,USA: Society of Petroleum Engineers,1994.
[37]Dranchuk P,Kassem H.Calculation of z factors for natural gases using equations of state[J].Journal of Canadian Petroleum Technology,1975,3(14):34-36.
[38]Lee A,Gonzalez M,Eakin B.The viscosity of natural gases[J].Journal of Petroleum Technology,1966,8(18):997-1000.
[39]Agrawal S,Sharma M M.Practical insights into liquid loading within hydraulic fractures and potential unconventional gas reservoir optimization strategies[J].Journal of Unconventional Oil and Gas Resources,2015,11:60-74.
[40]Parmar J,Dehghanpour H,Kuru E.Displacement of water by gas in propped fractures:Combined effects of gravity,surface tension,and wettability[J].Journal of Unconventional Oil & Gas Resources,2014,5:10-21.
[41]Zhang J,Huang S,Cheng L,et al.A mathematical model for drainage and desorption area analysis during shale gas production[J].Journal of Natural Gas Science and Engineering,2014,21:1032-1042.
[42]Mahadevan J,Sharma M,Yortsos Y.Evaporative cleanup of water blocks in gas wells[J].SPE Journal,2007,12(12):209-216.
[43]Zhang Hao,Kang Yili,Chen Yijian,et al.The study of geology course and experiment simulation for forming ultra-low water saturation in tight sandstones gas reservoirs[J].Natural Gas Geoscience,2005,16(2):186-189.[张浩,康毅力,陈一健,等.致密砂岩气藏超低含水饱和度形成地质过程及实验模拟研究[J].天然气地球科学,2005,16(2):186-189.]
[44]Qian Bin,Zhang Juncheng,Zhu Juhui,et al.Application of zipper fracturing of horizontal cluster wells in the Changning shale gas pilot zone,Sichuan Basin[J].Natural Gas Industry,2015,35(1):81-84.[钱斌,张俊成,朱炬辉,等.四川盆地长宁地区页岩气水平井组“拉链式”压裂实践[J].天然气工业,2015,35(1):81-84.]
[45]Liu Naizhen,Liu Ming,Zhang Shicheng.Flowback patterns of fractured shale gas wells[J].Natural Gas Industry,2015,35(3):50-54.[刘乃震,柳明,张士诚.页岩气井压后返排规律[J].天然气工业,2015,35(3):50-54.]
[46]Blasingame T.The characteristic flow behavior of low-permeability reservoir systems[C]//SPE Unconventional Reservoirs Conference.Keystone,Colorado,USA: Society of Petroleum Engineers,2008.
[47]Shaoul J,Zelm L,Pate C,et al.Damage mechanisms in unconventional-gas-well stimulation:Anew look at an old problem[J].SPE Production & Operations,2011,26(4):388-400.
[48]Xu M,Dehghanpour H.Advances in understanding wettability of gas shales[J].Energy & Fuels,2014,28(7):4362-4375.
[49]Liu Xiangjun,Xiong Jian,Liang Lixi,et al.Analysis of the wettability of Longmaxi Formation shale in the south region of Sichuan Basin and its influence[J].Natural Gas Geoscience,2014,25(10):1644-1652.[刘向君,熊健,梁利喜,等.川南地区龙马溪组页岩润湿性分析及影响讨论[J].天然气地球科学,2014,25(10):1644-1652.]
[50]Bimal P,Sharma M.Cleanup of water blocks in depleted low-permeability reservoirs[C]//SPE Annual Technical Conference and Exhibition.Houston,Texas,USA: Society of Petroleum Engineers,2004.
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