Dependence of poroperm properties on stresses in geomaterials by back analysis of lab test data

Авторы: Nazarova L.A.   (ИНГГ СО РАН)   Nazarov L.A.   (ИНГГ СО РАН)   Panov A.V.     Golikov N.A.   (ИНГГ СО РАН)  
дата публикации: 2020
The authors have justified and physically simulated methods of finding poroperm properties as function of effective stresses s in geomaterials of different types. The related test bench is designed and manufactured; it includes a measurement cell to be filled with a granular material, a loading facility and a recording system for pressure, flow rate and stress m applied to the cell. At each stage of loading, seepage tests were carried out at various input pressure pn of gas. By the stationary measured flow rates Qmn, using the back analysis, the empirical permeability dependence k(s) is determined and approximated by the two-parameter exponential function. Under fixed m the cell was pumped out and connected with a reservoir filled with known quantity of air. By the settled equilibrium pressure in the cellreservoir system, the porosity m is calculated. The tests with fine-grained sand show that the coefficient characterizing the permeabilityeffective stress dependence something like 0.2 MPa-1; the permeabilityporosity relation can be described by an exponential function; and the KozenyCarman equation is fulfilled at a good accuracy in this case. The technology of making specimens of preset shape from artificial geomaterials (graded sand, mixed with cryogel) having poroperm properties as well as deformation and strength characteristics similar to high-permeable reservoir rocks (as laboratory tests have shown) is developed and trialed. The test bench is manufactured for the physical simulation of mass transfer processes in cylindrical specimens with central hole under nonuniform stress state. From the back analysis of the test data, the empirical dependence of permeability on effective stress in artificial geomaterials is determined.
первоисточник: International Society for Rock Mechanics and Rock Engineering - EUROCK 2020 (14 - 19 June, 2020)
страницы: In press. (В печати)
ISBN: 9788282080729
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