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Recent content by YEngineer

  1. YEngineer

    Dealing with Scaling and NORM reservoir fluids

    Many years ago I was working on some formation prone to barite scale. It was scaling wells nearbore and could not be removed using usual acid treatments (HCl, mud acid) Reperforation and small skin bypass fracks were showing some success. Continuous chemical injection would the best way to lower...
  2. YEngineer

    Unloading a low pressure oil well

    At the end of an acid job, I might end up with about 200m of fluid column in tubing. The well is 2900m TVD, there is a tubing extension joint on the way and tubing cannot be swabbed passed this point. I have only some approximate reservoir pressure data and I am afraid that at the end of the...
  3. YEngineer

    Which Equation of State

    Thanks Paolo, phase equilibrium and density are the parameters I am after mostly. The proposed stream is dry, or with a scenario where water can be present up to 0.01%
  4. YEngineer

    Which Equation of State

    I have been asked to calculate maximum H2S release rate from an acid gas injection well. Proposed stream has +/- 40% H2S; 50%CO2 and the rest are HC's. Everything is on paper - no lab data. This work will also include well modeling to predict friction losses under different wellhead injection...
  5. YEngineer

    How to choose material for well head equipements

    API 6A has recommendation in regard with production specific level PSL. NACE MR 0175 has specs for sour service and other materials used in corrosive environments. Based on calculated partial pressure some companies might have other (usually more stringent)requirements on material used...
  6. YEngineer

    Gas flow through an Orifice

    Thanks BigInch. I tested it and gave me very close results - 8% differennce with what I had calculated. But much more simple. Thanks again BigInch
  7. YEngineer

    Gas flow through an Orifice

    Thanks for your input BigInch. The link to the spreadsheet however, seems to be broken. can you please reup. Thanks again
  8. YEngineer

    Gas flow through an Orifice

    A presentation about chokes found here: https://www.aiche.org/sites/default/files/cep/20131068_r.pdf These factors are called as positive choke factors. Based on that presentation it seems that these factors have been derived based on SG = 1; gas temp t = 60F and for critical flow. Some of...
  9. YEngineer

    Gas flow through an Orifice

    I am building an spreadsheet which would calculate the time needed to depressure a gas pipeline. The spreadsheet will calculate the depressurizing time for two scenarios. Scenario 1 - the ppl is depressurized using a pipe with high opening valve. (flow calculations are done using Fisher...
  10. YEngineer

    Challenges of developing very sour oil?

    We inherited a highly sour gas well (~22% H2S, 8%CO2). The previous operator attempted several times to put this well on production with limited success. The problems were corrosion and sulphur plugging. They produced this well for several years with some very costly interventions (the well was...
  11. YEngineer

    Help modifying a VBA Code

    acknowledged
  12. YEngineer

    Help modifying a VBA Code

    Thank you very much IDS, it worked. For future references for the guys who do not know VBA the array formula is: MIN((($B$5:$B$500-Q5-$X$7)^2+($C$5:$C$500-R5-$X$8)^2+($D$5:$D$500-S5-$X$9)^2)^0.5) thanks again IDS
  13. YEngineer

    Help modifying a VBA Code

    The code below calculates the minimal distance in space of between two lines. Points of line 1 have their coordinates x,y,z in columns c,d,b and those of line 2 in columns r,s,q. The minimal value is displayed in a message. I want to change the macro so that each minimal distance for each...
  14. YEngineer

    Wireline or Tubing for Perforation

    General procedure for TCP perforation is: - Swab the well - prepare and run TCP stack - depth correction - Adjust depth and mount wellhead on. Drop the bar/perforate. For Eline is: - Circulate to completion fluid - Swab (or maybe not) - Rig in ELine - Run in hole and perforate. As you can see...
  15. YEngineer

    How to model/evaluate a supposed Horizontal well

    We completed and frac stimulated last month a tight gas well (vertical, ~2200m). The frac sanded off, after ~80t of sand were gone into formation. Initial production 0.6mmscf/d. Well test analysis shows k ~ 0.1mD, S ~ -3.6, reservoir boundaries were not “felt” during the test. Now, management...
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