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  1. dhayes

    What is a long string and short string in a well?

    Strings are separate tubular conduits to separate completion intervals. I have never heard of an injection well having 2 strings. With SAGD, might have the ability to inject shallow via the short string, and produce from a deeper interval via the long string. Could also have a shallow...
  2. dhayes

    Oil shrinkage to to heater treater

    Can use a hydrocarbon processing simulator like WinSim or Hysys to model the compositional change and volume losses. I don't know of a quick and dirty technique. You would need a compositional analysis of the oil to use the simulation method.
  3. dhayes

    GVF; GOR & GLR units?

    To do this correctly, we would need to know more about the fluids - Oil - oil gravity, Water - water salinity, Gas - gas gravity, CO2 mol%, H2S mol%, N2 mol% Some of the gas will go into solution into the oil and water, and the supercompressibility of the gas also should be considered. The...
  4. dhayes

    GVF; GOR & GLR units?

    Depending on the application, GVF is usually the % of the total volume occupied by gas at the conditions being considered. So GVF is dimensionless - need to calculate the volumes of each fluid phase in same volume units, whether that be gallons, SCF, BBL, etc.... GOR units are usually SCF/STBO...
  5. dhayes

    Used tubing testing for H2S service

    Is there a way to test used tubulars to verify the grade of the pipe, relative to NACE MR-0175 requirements for application in H2S environments? How do you verify that a used string of L-80 pipe is L-80 and not some other grade? I have not found a non-destructive way to verify that a used...
  6. dhayes

    Acid Gas Solubility in Brine

    I am looking for information on the solubility of acid gas ( 75% H2S + 25% CO2 ) in brine. Are there any sources for this data available in the literature? I haven't found anything yet. From what I've seen all simulators allow for simulating mixing acid gas and water, but when it comes to...
  7. dhayes

    CO2 gas solubility data regression

    I am interested in acid gas solubility in brine also - 75% H2S, 25% CO2. I am interested in how this can be modelled in Aspen or other simulators...
  8. dhayes

    How to predict Liquid Rate and Water Cut versus time

    If you have historic production data, you can use a plot of log water/oil ratio (WOR) vs linear cumulative oil production plot to forecast the future WOR as a function of cumulative oil production. There is some theoretical basis for this approach, based on relative permability effects and...
  9. dhayes

    Well testing

    I don't know your situation, but the most accurate way is a 3 phase test separator, operating at the same pressure as the main separator. Individual meters on the test separator determine the volume produced during the test period of gas, oil, and water. If the test separator operates at a...
  10. dhayes

    Line pipe grade and schedule identification

    Is there a way to determine what grade and schedule of line pipe has been used in an installation by inspection, using nondestructive methods? I assume the wall thickness could be determined by ultrasonic measurement. With that information and the OD, one could identify the schedule. But what...
  11. dhayes

    Lateral piping design downstream of Choke plate

    One solution might be some sort of surface hardening, such as nitriding. This is done with downhole tubular equipment to prevent erosion during frac stimulation. What are the velocities downstream of the choke? You might consider larger piping to reduce the velocities, or take the pressure...

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