Sunday, May 9, 2021

Casing Design: 2021 #24

True statements about casing design include (select any that apply):
__ Conductor casing is the first string set below the structural casing.
__ Liner is a casing string that does extend back to the wellhead.
__ Tieback string is a casing string that provides additional pressure integrity from the liner shoe to the wellhead.
__ Tiebacks can be uncemented.
__ Tiebacks can be cemented.
__ Burst pressure conditions occur during well control operations and squeeze cementing.
__ Most oilfield tubulars experience collapse in the “plastic” and “transition” regimes.
__ For certain casing sizes, the threads are intended to be leak resistant when made up.
__ Buckling is typically a more critical design issue for production tubing than for casing.

The provided Reference Guide on the exam offers no help on word problems; hence, there is no escape from prior experience or study on these types of questions. Please provide comments or ask questions in the comment box below.

2 comments:

  1. _F_ Conductor casing is the first string set below the structural casing.
    _T_ Liner is a casing string that does extend back to the wellhead.
    _F, from LNR TOP_ Tieback string is a casing string that provides additional pressure integrity from the liner shoe to the wellhead.
    _T_ Tiebacks can be uncemented.
    _T_ Tiebacks can be cemented.
    _T_ Burst pressure conditions occur during well control operations and squeeze cementing.
    _T_ Most oilfield tubulars experience collapse in the “plastic” and “transition” regimes.
    _T_ For certain casing sizes, the threads are intended to be leak resistant when made up.
    _T_ Buckling is typically a more critical design issue for production tubing than for casing.

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    Replies
    1. Sorry I've had some Bogger technical issues so comments & posts have been disappearing.

      If I understand you, you believe #1, #2, #3, #8 are wrong, correct? Thanks for taking the time. However, if you really think so, please provide the source material as to "why" you think they are wrong.

      In the meantime, have you looked in the provided source referenced in TS2 P287-304? If you don't have the books, you can find the direct quotes used on these problems on petrowiki at the following link: https://petrowiki.spe.org/Casing_and_tubing

      1) Conductor casing is the first string set below the structural casing.
      "Conductor casing is the first string set below the structural casing" TRUE, check.

      2) Liner is a casing string that does extend back to the wellhead.
      "Liner is a casing string that does not extend back to the wellhead" FALSE, check.

      3) Tieback string...provides additional pressure integrity from the liner shoe to the wellhead.
      "Tieback string...provides additional pressure integrity from the liner top to the wellhead." FALSE, check.

      8) For certain casing sizes, the threads are intended to be leak resistant when made up.
      "For all casing sizes, the threads are not intended to be leak resistant when made up." FALSE, check.

      Anyway, let me know what you think. Note the PE Exam can certainly use any SPE material as their source material, so I would focus on what the texts say and not your interpretation of them or personal experience/opinion. YMMV.

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