ABSTRACT
Yushulin Oilfield is an oilfield with the low produc-
tion and low permeability. Its physical properties of
crude oil are poor, single well production is low, the
construction investment per unit capacity and opera-
tion cost are high. After several decades of devel-
opment and construction, the field is now entering
the high water-cut stage, in which liquid-producing
capacity increases and oil production declines conti-
nuously, resulting in the production cost of crude oil
constantly rises (Zhao 2003). As one of the main
energy consumers, the crude oil gathering and trans-
portation system is suffering an ever-increasing con-
tradiction between the decrease in production and
the rise in energy consumption. According to a sta-
tistic, in 2008 the annual gas consumption in Yushu-
lin Oilfield is about 1.9×10
m
, the gas consump-
tion per ton oil is 45.83 m
/t which is much higher
than the external field index (30 m
/t). In order to
reduce the energy consumption of the gathering and
transportation system, Daqing Oilfield, Shengli Oil-
field, etc. have carried out the research on such ga-
thering and transportation process technology as to
reduce the energy consumption (Zhao et al. 1997,
Wei et al. 2002). By means of the chemical assis-
tance, passage spherical pig application, normal
temperature water blending assistance and other
process technologies, several non-heating oil gather-
ing processes with different characteristics have
been successfully developed, such as the conven-
tional double-pipe non-heating oil gathering process
with blending of normal-temperature water, conven-
tional single-pipe non-heating oil gathering process,
double-pipe non-heating oil gathering process, non-
heating oil gathering process with blending of the
crude oil flow improver and normal-temperature wa-
ter, annular single-pipe non-heating oil gathering
process and so on (Hu et al. 1995, Yang et al. 1998).
