  We demonstrate that to calculate the self-energy of a heavy quark in the
heavy quark limit (or the heavy fermion limit in what is called the Baryon
Chiral Perturbation Theory), the use of standard dimensional regularization
provides only the quantum limit: opposite to the heavy quark (or classical)
limit that one wishes to obtain. We thus devised a standard
ultraviolet/infrared regularization procedure in calculating the one- and
two-loop contributions to the heavy quark self-energy in this limit. Then the
one-loop result is shown to provide the standard classical Coulomb self-energy
of a static colour source that is linearly proportional to the untraviolet
cutoff $\Lambda$. All the two-loop contributions are found to be proportional
to $\Lambda \ln(\Lambda/\lambda)$ where $\lambda$ is the infrared cutoff. Often
only the contribution from the bubble (light quarks, gluon and ghost) insertion
to the gluon propagator has been considered as the $O(\alpha_s)$ correction to
the Coulomb energy to this order. Our result shows that other contributions are
of the same magnitude, thus have to be taken into account.
