Study on fluid mechanics and Effective Stress Law of Fracture Intersection

Tech 2023-05-26 07:50:16 Source: Network

Wen Xiaoqi is a bit strangeEditor | Xiaoqi is a bit strangeBefore reading this article, we sincerely invite you to click on itFollow, which not only facilitates your discussion and sharing, but also brings you a different sense of participation. Thank you for your supportprefaceThrough brittle crustFluid flowMainly affected byFracture network is fluid transportstayIntersection of cracksstayFluid flowpermeability The degree of enhancement has not been quantified yet

Wen Xiaoqi is a bit strange

Editor | Xiaoqi is a bit strange

Before reading this article, we sincerely invite you to click on itFollow, which not only facilitates your discussion and sharing, but also brings you a different sense of participation. Thank you for your support

preface

Through brittle crustFluid flowMainly affected byFracture network is fluid transportstayIntersection of cracksstayFluid flowpermeability The degree of enhancement has not been quantified yet.

Fluid is mainly transported within the shallow crust through a network of interconnected cracks. Many practical applications require accurate prediction through crack networksFluid flow rateAnd direction. Although the hydraulic characteristics of individual cracks and their behavior with increasing depth have been extensively studied, the transmission characteristics of intersections between cracks have not yet been quantified.

Low porosity rock-Fluid flowstayand

stayCrack control systemstayandandstay

stayFault intersection pointIt has been recognized as an efficient, long-term, and concentrated fluid pipeline for the formation of mineral deposits, as well as the location of geothermal reservoirs andHydrocarbon leakageAlthoughIntersection of cracksstayand

andFluid flow rateFluid flowCoupled fluid mechanicsQualitative understanding of behavior.

andFluid flowThe relationship between hydraulic and mechanical properties of rock fracturesGap spaceandFluid flow

Fluid flowEffective stressstayandCombinations that produce the same material characteristics of interestRegardless of the individual's impactpcandppThe size of.

andIntersection of cracksandstayLow porosity crystalline rockThe composite intersection point is generated between two orthogonal tensile cracks generated using Brazilian testing technology.permeability pcpp,stayandpermeability

permeability Macroscopic crackandIntersection of cracksESLpermeability permeability

stayStatic pressure permeameterSeason the cracks in the middle. Subjecting rock fractures to multiple cycles of pressure and pressure reduction to minimizeInelastic hysteresis effect-Unloading cycle10MPa1090MPastay10MPa

staystay5MPastaypermeability Brazilian testing equipment

Intersecting crackpermeability

permeability

The penetrometer consists of a steel pressure vessel, whereRubber jacketRock samples can withstand a hydrostatic pressure of up to 200MPa, which is pumped into the container through a compressed air systemSilicone oil drivestay70MPa

The stress history dependence detected in the experiment indicates that the first loading cycle overestimatedpermeability andandpermeability Fluid flow

staypermeability staystaystaypermeability

andMechanical behaviorandFluid flowGap spaceandMechanical deformationand

stayFluid flow

Macroscopic crackpermeability staypermeability Intersecting cavityCompliance is lower thanMacroscopic crackFluid flowand

andIntersecting crackpermeability . Macroscopic crackandpermeability staystaypermeability

Interestingly, based on what we are considering herepermeability Macroscopic crackstaypermeability stay. Macroscopic crackpermeability

SBpermeability ,stay,Macroscopic crackpermeability Macroscopic crack,40MPa

Seljadalurpermeability Macroscopic crackMacroscopic crackandstay

permeability andFluid flow

Fluid flowFluid flowBorehole datasetIn order to predict the configuration of crack networks at specific depths.

ESLDefinedandCombination, regardless of PCandppEffective stress

Because what we're dealing with isIsotropic stressTherefore, for stress states that generate the same volume of fluid channels, it can be considered that the flow velocity is equal. This assumption allows us to believe thatpermeability ESLpermeability The analysis expression has been previously derived.

stayIntersecting cavityMacroscopic crackESCIntersecting crackIntersecting cavityThe fracture range is 0-84 to 1, with an average value of 0.91, whileThe intersection range is 0.77 to 0.86, with an average value of 0.81.

permeability ESLTerzaghiESL pe=pcppDifferent from many practical applications, any situation where the periodic variation of pore pressure is altered by injecting fluid into the reservoir.

conclusion

stayandpermeability stayIntersecting crackstayandIntersection of crackspermeability

staypermeability -Unloading cyclepermeability andandstayandpermeability

Circulating hydrostatic pressureandstayandandFracture roughness indexBut it will change

staySBTensile crackpermeability permeability permeability Hypothetical Cross Systempermeability

reference

[1] Application Analysis and Development Prospects of Pneumatic Conveying [J]. Wang Yanli. Shandong Chemical Industry, 2017 (07)

[2] Flow characteristics of particle clusters in gas-solid fluidized beds [J]. Huang Yahang; Liu Mengxi; Hu Juan. Journal of Process Engineering, 2016 (03)

[3] Analysis of icing growth process of different types of insulators based on fluid mechanics [J]. Zhang Zhijin; Yellow Sea Boat; Jiang Xingliang; Hu Jianlin; Sun Caixin. Journal of Electrical Technology, 2012 (10)

[4] Research progress in simulation of migration and distribution of hydraulic fracturing proppants [J]. Pan Linhua; Wang Haibo; He Jiayuan; Li Fengxia; Zhou Tong; Bruce Lee. Natural gas industry, 2020 (10)

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