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Recent content by Taylor W

  1. Taylor W

    Modeling fluid in a well

    Here is my input file. I should clarify that the fluid flow is straight upward parallel to the well wall, but there is some pore fluid seepage, which I model with a pore pressure boundary condition. I'm trying to model a drill spurting mud up to the surface, but for simplification, I'm not...
  2. Taylor W

    Modeling fluid in a well

    Hi all, I'm trying to model fluid flow in a vertical wellbore in Abaqus, including heat transfer and pore pressure. I currently have a geostatic step and a step where I model the fluid flow using convection, pore pressure, and pressure BCs/loads. I want to add another step where I stop the...
  3. Taylor W

    Thermal expansion coefficient volumetric or linear?

    Hi all, In Abaqus, for the thermal expansion coefficient, do you input the volumetric or linear expansion coefficient? I'm assuming that it's the linear coefficient(s) regardless of whether it's isotropic, orthotropic, or anisotropic, but I just want to be sure. Thanks!
  4. Taylor W

    Permeability not affecting soils analysis

    Ah, you're right, the fluid velocity does change. Does it not affect the stresses and pore pressure? Those aren't changing.
  5. Taylor W

    Permeability not affecting soils analysis

    Hi all, I am running a steady-state soils analysis in Abaqus, and no matter what I change the permeability to (other than zero), the results do not change. Is this correct, or am I doing something wrong? Thanks!
  6. Taylor W

    Trouble meshing part

    Sorry, I did forget to mention that I am using coupled temperature-pore pressure elements in Abaqus, which doesn't allow tetrahedral elements. I could make the domain smaller, but I need it large enough that the far field boundary conditions don't interfere with the loads at the wellbore.
  7. Taylor W

    Trouble meshing part

    Hello all, I'm trying to simulate a well angled 60 degrees from the vertical, but I haven't been able to get a decent mesh. I've tried many partitions and seeds, but none have worked. Any insights or tips would be appreciated. I've attached the part file and a screenshot of the part...
  8. Taylor W

    Get stress/temperature at nodes in assembly set

    Hello all, I'm trying to find a way to get the Mises stress and temperature at nodes on an edge using a script. I've created an assembly set at that edge, and here's roughly what I'm currently doing: o1 = session.openOdb(name='myODB.odb') resultsSet = o1.rootAssembly.nodeSets['Set-1'] temps =...
  9. Taylor W

    Geostatic Step Questions

    Yes, but if I want to prescribe a pore pressure that is only the hydrostatic pressure without any excess, would I set it to 0 or to the hydrostatic pressure? For example, the hydrostatic pressure in my example is 24.8 MPa at y = 0 and 25.1 MPa at y = -30. I know how to set a linear pore...
  10. Taylor W

    Geostatic Step Questions

    So if there's no initial pore pressure other than the hydrostatic pressure, should the initial pore pressure be 0?
  11. Taylor W

    Geostatic Step Questions

    Hello all, I have several questions about the geostatic step. I am trying to model a well with a radius of 8.75 inches using 2D axisymmetric elements surrounded by infinite elements. It also includes pore pressure and I am using a gravity load. 1. Is the weight of the water included in the...
  12. Taylor W

    2D Well Model Not Converging

    I'm wondering if the problem is using total vs. excess pore pressure. The pore pressures I've used are in terms of total pore pressure, which the documentation says I should do since I have a gravity load, but is there anything else related to pore pressure I did wrong?
  13. Taylor W

    2D Well Model Not Converging

    Removing the Mohr-Coulomb plasticity definition does make it converge, but I need that as part of the analysis and I'm fairly sure the Mohr-Coulomb values are correct. If I do use it, there's too much plastic strain, which causes it to diverge. Is there anything else it could be?
  14. Taylor W

    2D Well Model Not Converging

    Hello all, I am trying to make a simplified model of a vertical drilling wellbore in granite. I can't get the geostatic step to converge due to excessive distortion. Am I doing something wrong? Many of the values I am given are in imperial units, but I'm running the analysis in SI units for...
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