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The Study Of Oil-Gas Reservoir Porosity Medium's Deformation Theory And Applications

Posted on:2005-11-30Degree:DoctorType:Dissertation
Country:ChinaCandidate:M P YangFull Text:PDF
GTID:1100360152956395Subject:Oil and gas field development project
Abstract/Summary:PDF Full Text Request
In this thesis, as a special porous medium, oil and gas reservoir's rock is a study object. By integrate experiment study with theory study; integrate rock mechanics, fluid mechanics, flow mechanics with exploitation theory of oil and gas field; and integrate theory with practice, a full deformation theory of oil and gas reservoir porous medium has been founded.In the exploitation of oil and gas field, the reservoir porous medium's deformation is elastic-plastic deformation; the Primary Deformation and the Structural Deformation are included. Pressure (Such as confining pressure, incumbency rock pressure, porosity pressure, well bore fluid column pressure, and so on), temperature and fluid's types are the mostly external factors for deformation of reservoir porous medium, and mass constitutes, unit's types, contact and arrangement relation of granula, cement mode are the interior factors for the deformation. Based on the Terzaghi effective stress theory and other modified effective stress, skeleton stress of porous medium has been studied by effective stress, and integrate reservoir porous medium's deformed mechanism, primary effective stress and structural effective pressure have been studied, and effective stress of multi-porous media also has been studied.Advanced experimental devices and methods, the reservoir rocks' porous characteristic have studied permeability and saturation characteristic of fluids about porous medium's deformation. The studies indicated that the porosity and permeability of oil and gas reservoir porous medium are decrease with increase of effective stress (or effective pressure), the relation between effective stress and porosity, permeability, saturation can been fitted by mathematical method, and primary effective stress about oil and gas reservoirs in the actual subterranean formation was been considered. Contrapose the fracture reservoirs' peculiar deformation characteristics, fracture's stress sensitivity, closure mechanism and closure law have been detail studied.Based on the relation between permeability of reservoir and effective stress, relation between permeability and drawdown pressure also could been fitted by index relation, and permeability deformed coefficient about porous medium's deformation was defined. Thenthe affect about oil and gas flow by deformation of reservoirs porous medium has been studied, flow mathematical models of deformed medium have been founded, and well test methods about deformed medium have been studied. For the peculiar characteristics of low-permeability deformed medium reservoirs, such as starting pressure gradient, productivity analysis method has been studied, and the affects about produce by reservoir deformed for increase of drawdown pressure have been analyzed, the reasonable drawdown pressure of the low-permeability deformed medium oil reservoir has been founded.
Keywords/Search Tags:porous medium, elastic-plastic deformation, effective stress (effective pressure), porosity, permeability, saturation, stress sensitivity, fracture, permeability deformed coefficient, oil and gas flow, deformed medium.
PDF Full Text Request
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