1 / 10

Petroleum engineering – gas hydrate, paraffin etc. formation

Salt precipitation in porous media and multi-valued solutions G. G. Tsypkin Institute for Problems in Mechanics RAS, Moscow, Russia. Petroleum engineering – gas hydrate, paraffin etc. formation Soil sciences – salt precipitation, ice formation etc. Chemical engineering – filters

mona-stein
Download Presentation

Petroleum engineering – gas hydrate, paraffin etc. formation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Salt precipitation in porous media and multi-valued solutionsG. G. TsypkinInstitute for Problems in Mechanics RAS, Moscow, Russia Petroleum engineering –gas hydrate, paraffin etc. formation Soil sciences –salt precipitation, ice formation etc. Chemical engineering – filters Geothermal reservoir engineering –salt precipitation, crystallization of components due to chemical reactions etc.

  2. Salt precipitation in soilswith destruction of porous media

  3. SPE 68953The Precipitation of Salt in Gas Producing WellsW. Kleinitz, SPE, M. Koehler and G. Dietzsch, SPE, Preussag Energie GmbH, Germany. 2001.Scanning electron micrographof precipitate formation in the sample of rock

  4. Sketch of the problem: salt precipitation in geothermal reservoirs

  5. Basic equations Vapor domain: Water domain:  –porosity,  – density, k – permeability, µ – viscosity, w– compressibility, h – specific enthalpy, e – the specific internal energy,  – thermal conductivity,T– temperature, P– pressure, v – filter velocity, Spr– solid salt saturation, c – salt concentration

  6. Boundary conditions through the interface Discontinuities of water and salt saturation functions Mass balance for H2O and salt: Momentum balance: Thermodynamic equilibrium: Energy balance: Initial and boundary conditions Similarity solution

  7. Variation of the mass of salt in the vapour domain as a function of reservoir pressureTsypkin G., Woods A. J. Fluid Mech. 2005

  8. Analytic (1) and numerical results (2)Tsypkin G., Calore C. Proc. 32nd Workshop on Geothermal Reservoir Engineering, Stanford, 2007

  9. Salt diffusion influence in low-permeability reservoirsTsypkin G. Fluid Dynamics. 2009. T = const

  10. Conclusions • There are two self-similar solution branches for precipitation problem • These two branches coincide for critical values of the parameters, and above these values, the self-similar solution ceases to exist • For a higher initial pressure and larger well pressure rock becomes fully sealed with salt • Salt diffusion may lead to a sleeping regime formation in low-permeability rock

More Related