By Steve Cannon
Petrophysics is the technological know-how of comparing the rock and fluid homes of oil, fuel and water reservoirs during the acquisition of actual samples, electric, chemical, nuclear and magnetic facts received via floor logging, downhole coring, and drilling and wireline sondes. The evaluate, research and interpretation of this knowledge is as a lot an paintings as a technology because it calls for an figuring out of geology, chemistry, physics, electronics, mechanics and drilling technology. The recommendations were built over the past a hundred years essentially through the oil and fuel undefined, however the ideas are both correct in coal mining, hydrogeology and environmental science.
This e-book is firmly aimed toward scholars of geology and petroleum engineering searching for a realistic knowing of the history and workflows required to accomplish a petrophysical examine of a good, a reservoir or a field. Petrophysics is log research restricted through geology, and if we forget about the rocks we hazard making negative funding decisions.
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Extra info for Petrophysics: A Practical Guide
Example text
Permeability is a key input for numerical reservoir simulation. Relative permeability expresses the relative contribution of each liquid phase to the total flow capacity of the rock. Capillary pressure also determines the fluid distribution and saturation in a reservoir, hence the link to wettability. 7 Capillary pressure (Pc) and wettability: (a) representation of a liquid-filled capillary tube and the relationship between the buoyancy pressure generated between two immiscible fluids; (b) the difference between wetting and non-wetting liquids as a function of the surface tension and contact angle.
The pore network of a clastic reservoir is generally intergranular in nature; however, compaction and diagenesis can alter the porosity significantly, and seldom for the better. (b) Typical visual estimation of degrees of sorting in sandstones. The complex geological, physical and chemical nature of carbonate rocks often results in substantial pore systems that are ineffective as producing reservoirs without some type of stimulation to connect the matrix, where the bulk of the hydrocarbons are stored, with the primary flow paths.
3 Permeability ranges for different qualitative descriptions of permeability. Permeability is a key input for numerical reservoir simulation. Relative permeability expresses the relative contribution of each liquid phase to the total flow capacity of the rock. Capillary pressure also determines the fluid distribution and saturation in a reservoir, hence the link to wettability. 7 Capillary pressure (Pc) and wettability: (a) representation of a liquid-filled capillary tube and the relationship between the buoyancy pressure generated between two immiscible fluids; (b) the difference between wetting and non-wetting liquids as a function of the surface tension and contact angle.