Neftegaz.RU #3-17 ENG

OFS
РИС. 1. Темпы падения по дебиту жидкости ГС с МГРП на 1 кусте
No.12Г) have been brought into
development in 2011 and two wells
(No.13Г and No.14Г) – in 2012.
As on January 01, 2013, all four
horizontal wells are drilled to the bed
АС11 with various lengths (Figure 1).
As on January 01, 2013, additional
oil production from HW with multistage
fracturing has amounted 202.7
ths.t, cumulative fluid production has
amounted 228 ths.t.
The best indicators are obtained
at the wells 12Г and 13Г, which is
related first of all to increase of net
oil pay thicknesses. The well 11Г
has the lowest decline rates, flow
rates decline is related to emergency
condition of the well. One can
observe stabilization of the decline
rate by fluid. The average decline
rate amounts 0.6.
During the years 2011 – 2012, four
directionally-inclined producing
wells, namely, 15, 16, 17 and
18, have been commissioned
at the experimental plot. These
wells performance indicators are
significantly inferior to horizontal
wells with hydraulic fracturing.
The table 1 gives comparison or
operation of horizontal wells and
directionally-inclined wells located at
the experimental plot.
As one can see in the Figure 2,
current flow rate of HW exceeds
experimental plot vertical wells flow
rates by 2.5 – 3.0 times.
The average cumulative withdrawal
per one directionally-inclined well
amounts 10.7 ths. t, when the
average cumulative production at
horizontal wells amounts 50.6 ths. t
(from 22.7 to 89.2 ths. t). Additional
oil production during the period
2011 – 2012 has amounted 202.7
ths. t.
High costs of construction of
horizontal wells with multi-stage
hydraulic fracturing dictate necessity
for sound approach of the designing
stage implementation. Calculations
of the alternative variants for the
experimental plot development by
various parameters, namely wells
location, fractures orientation, have
been performed at the Priobskoe
field. The data have been compared
with the basic approved variant –
TABLE 1. The main technological performance indicators of HW and DIW
Параметры работы
Horizontal wells with multistage
hydraulic fracturing
Initial
parameters
As on January
01, 2013
Directionally-inclined wells
with hydraulic fracturing
Initial
parameters
As on January
01, 2013
Oil flow rate, t/day 210.5 131.8 93.2 15.5
Fluid flow rate, t/day 255.3 161.5 99.3 34.3
Water cut, % 5.3 18.0 6.3 33.5
Cumulative oil
production, ths. t
202.4 42.7
Cumulative fluid
production, ths. t
228.0 70.4
FIG. 2. Comparison of oil flow rates of HS with DIW in the cluster 1
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