Regulatory
Citation(s):
78.83.
Surface and coal protective casing and cementing procedures.
(j) If it is anticipated that cement used to
permanently cement the surface casing cannot be circulated to the surface a
cement basket may be installed immediately above the depth of the anticipated
lost circulation zone. The casing shall be permanently cemented by the
displacement method. Additional cement may be added above the cement basket, if
necessary, by pumping through a pour string from the surface to fill the
annular space. Filling the annular
space by this method does not constitute permanently cementing the surface or
coal protective casing under Section 78.83b (relating to casing and
cementing-lost circulation).
Question:
In instances where no surface returns are
observed, does filling the annulus of the surface or coal protective casing
using a pour string render that casing string permanently cemented?
Response:
The regulatory citation above clearing
indicates that filling the annular space of a surface or coal protective string
using a pour string does not render the casing string permanently cemented in
circumstances where no returns were observed during the primary cementing
operation: Filling the annular space by this method does not constitute permanently
cementing the surface or coal protective casing under Section 78.83b (relating
to casing and cementing-lost circulation).