The
proposals
would
encourage
investors
in
Russia,
whose
status
as
the
world's
top
crude
producer
is
threatened
by
falling
conventional
output
at
Soviet-era
fields,
to
expand
use
of
costly
hydraulic
fracturing
and
other
chemical
enhanced
recovery
methods,
Reuters
reported.
The
practice
known
as
fracking,
which
brought
a
boom
in
US
unconventional
oil
and
gas
output,
is
already
in
use
at
some
fields
in
Western
Siberia,
the
Soviet-era
oil
heartland,
but
has
yet
to
open
up
the
so-called
tight
oil
targeted
in
the
proposals.
"This
will
open
a
second
life
for
Western
Siberia.
The…