Pits covered by this part shall include:

1. (1)

   1. (A) Circulation pit: a pit used during drilling where drilling fluids are circulated during drilling operations.
   2. (B) The circulation pit may be part of the mud pit.
   3. (C) Circulation pits may also refer to a series of open, aboveground tanks, usually made of steel;

2. (2)

   1. (A) Completion pit: a pit used for storage of completion flow-back fluid and drilling fluids or other materials which have been cleaned out of the well bore during the initial completion of a well.
   2. (B) Circulation or mud pits may be used as completion pits when drilling operations conclude;

3. (3)

   1. (A) Emergency pit: a pit used for containing fluids at an operating well during an actual emergency and for a temporary period of time.

   2. (B) Use of the emergency pit is necessitated due to unplanned operational issues, which may include but is not limited to:

      1. (i) A temporary shutdown of a disposal well or fluid injection well or associated equipment;
      2. (ii) Temporary overflow of saltwater storage tanks on a producing lease;
      3. (iii) Gas flaring;
      4. (iv) Cement circulation; or
      5. (v) A producing well loading up with formation fluids;

4. (4)

   1. (A) Mud pit: a pit or series of pits used during drilling where fluids are mixed and circulated during drilling operations.
   2. (B) Mud pits may also refer to a series of open, aboveground tanks, usually made of steel;

5. (5)

   1. (A) Reserve pit: a pit not part of the active circulation system, used to store drilling fluids or to contain fluids generated during drilling operations.

   2. (B) Such fluids would include, but not be limited to:

      1. (i) Cuttings;
      2. (ii) Drilling fluids; and
      3. (iii) Encountered water;
6. (6) Test pit: a pit constructed for use during a well test; and
7. (7) Workover pit: a pit used for storage of completion flow-back fluid, workover flow-back fluid, and other materials which have been cleaned out of the well bore during any subsequent completion or recompletion.