7 permeability of reservoir rock Xuanqi Zhang Petroleum engineering college
7 permeability of reservoir rock Xuanqi Zhang Petroleum engineering college
油藏物理学—岩石物性 outline 1.Darcy'law and absolute permeability 2.Measurement of permeability 3.Fracture permeability 4.Factors affecting permeability 5.The relationship between permeability and porosity and pore radius
outline 油藏物理学——岩石物性 1.Darcy’ law and absolute permeability 2. Measurement of permeability 3. Fracture permeability 4. Factors affecting permeability 5. The relationship between permeability and porosity and pore radius
油藏物理学—岩云物性 In addition to being porous,a reservoir rock must have the ability to allow petroleum fluids to flow through its interconnected pores.The rock's ability to conduct fluids is termed as permeability. This indicates that non-porous rocks have no permeability
油藏物理学——岩石物性 In addition to being porous, a reservoir rock must have the ability to allow petroleum fluids to flow through its interconnected pores. The rock’s ability to conduct fluids is termed as permeability. This indicates that non-porous rocks have no permeability
The permeability of a rock depends on its effective porosity,consequently,it is affected by the rock grain size,grain shape, grain size distribution (sorting),grain packing,and the degree of consolidation and cementation
The permeability of a rock depends on its effective porosity, consequently, it is affected by the rock grain size, grain shape, grain size distribution (sorting), grain packing, and the degree of consolidation and cementation
The type of clay or cementing material between sand grains also affects permeability, especially where fresh water is present. Some clays,particularly smectites (bentonites)and montmorillonites swell in fresh water and have tendency to partially or completely block the pore spaces
The type of clay or cementing material between sand grains also affects permeability, especially where fresh water is present. Some clays, particularly smectites (bentonites) and montmorillonites swell in fresh water and have tendency to partially or completely block the pore spaces
1.Darcy's law and absolute permeability French engineer Henry Darcy developed a fluid flow equation that since has become one of the standard mathematical tools of the petroleum engineer This equation is expressed in differential form as follows:
French engineer Henry Darcy developed a fluid flow equation that since has become one of the standard mathematical tools of the petroleum engineer . This equation is expressed in differential form as follows: 1. Darcy’s law and absolute permeability
△P 油藏物理学一傭层岩石的碜透率 9= K dp u= A u dl or Q=K4.2x10 Darcy's equation u L u fluid velocity,cm/s.q=flow rate cm3/s. k permeability of the porous rock,Darcy (0.986923m2)
油藏物理学——储层岩石的渗透率 10 L A p Q K P Darcy’s equation dl K dP A q u C or u = fluid velocity, cm/s. q = flow rate cm3/s. k = permeability of the porous rock, Darcy (0.986923 μm2 )
Ac=cross-sectional area of the rock,cm2. u=viscosity of the fluid,centipoises(cP ) mPa's. 1 length of the rock sample,cm. dp dl pressure gradient in the direction of the flow,atm/cm
Ac= cross-sectional area of the rock, cm2 . μ= viscosity of the fluid, centipoises (cP )/ mPa∙s. 1 = length of the rock sample, cm. = pressure gradient in the direction of the flow, atm/cm. dl dp
油藏物理学一傭层岩石的渗透率 Units on Darcy's law SI SE Di Q m3/s cm3/s cm3/s A m2 cm2 cm2 L m cm cm Pas cp mPa s △P Pa atm MPa K m2 Darcy ×0.1μm2
油藏物理学——储层岩石的渗透率 SI SE DI Q m3 /s cm3 /s cm3 /s A m2 cm2 cm2 L m cm cm μ Pa·s cp mPa·s ΔP Pa atm MPa K m2 Darcy ×０.１μm2 Units on Darcy’ s law
One Darcy is relatively high permeability. The permeability of most petroleum reservoir rocks is less than one Darcy.Thus a smaller unit of permeability,the millidarcy (mD),is widely used in the oil and gas industry.In SI units,the square micrometer (um2)is used instead of m2
One Darcy is relatively high permeability. The permeability of most petroleum reservoir rocks is less than one Darcy. Thus a smaller unit of permeability, the millidarcy (mD), is widely used in the oil and gas industry. In SI units, the square micrometer (μm2 ) is used instead of m2