Fluid mechanics and rock fracture kinetics of fracture mesh system in tight sand gas reservoirs
Received date: 2015-03-07
Revised date: 2015-04-16
Online published: 2016-02-10
Based on fluid mechanics equations and the Galerkin method,a finite element model has been established to simulate fracture mesh seepage field of horizontal wells volume fracturing,and the relationship between fracture mesh conductivity and production has been studied under different fracture mesh scale.Unlike shale gas,fracture mesh scale is not the bigger the better for tight sand stone gas.It should be maintained in a smalltomedium scale (0.1≤FCI≤0.25) and a high conductivity main fracture is also required.From production SRV curve,it is found that there exists a critical SRV value (optimal value),and the production increase is significantly smaller when SRV is beyond the critical value.In practice,together with SRV,the critical SRVconditions to form smalltomedium scale fracture mesh.An analytic relationship among fracturing fluid pump rate,viscosity,rock dynamic fracture toughness,elastic modulus,Poisson’s ratio,stress,natural fracture parameters and fracture net pressure is given by rock fracture kinetics,and then the optimized pump rate to form smalltomedium scale fracture mesh is determined by dynamic extension conditions on the fracture mesh edge.
Zhao Haifeng,Jiang Di,Shi Jun . Fluid mechanics and rock fracture kinetics of fracture mesh system in tight sand gas reservoirs[J]. Natural Gas Geoscience, 2016 , 27(2) : 346 -351 . DOI: 10.11764/j.issn.16721926.2016.02.0346
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