Haripur
Field
On
the basis of geological survey,
the then PAKISTAN PETROLEUM LIMITED
(PPL) started drilling activities
in Haripur structure back in 1955.
A total of eight wells (including
Surma 1/1A) so far were drilled
in this field, of which two turned
out as gas producer and one as oil
producer. A brief focus on the drilling
activities conducted in this field
is as follows:
Well
No. 1:
The
first discovery of natural gas in
this field as well as in this country
was made through drilling of well
No. 1. The well was spud on 26th
January, 1955 and was drilled up
to the depth of 7800 feet in 17
days. But all of a sudden the well
blew out due to abnormal pressure.
At the time of blow out, drilling
Rig with all accessories were submerged
and disappeared into the deep hole,
surrounding hills were fractured,
gas seeped out vigorously and gas
seeping out at nearby hills started
burning which is continuing till
today.
Well
No. 2:
The
well was drilled in 1956. At the
drilling depth of 9245 feet, an
abnormal high pressure had been
encountered. To control the situation
the well bore was plugged permanently
and the well was abandoned.
Well
No. 3:
This well was successfully drilled
up to a total depth of 5497 feet.
The well had been completed as dual
gas producer by perforating 4030-4070
feet in upper A sand and 4360-4390
feet in lower B sand. Commercial
Gas Production started from this
well in 1961. Production from lower
sand was suspended in 1969 due to
excessive water production. However,
gas production was continuing from
upper sand until March, 1988 when
the well was shut down due to excessive
production of water and sand. Since
then the well is dead with zero
well head pressure and full of formation
water in the tubing. Cumulative
gas production from this well until
March, 1988 is 89.106 billion cubic
feet. The formation pressure of
this well was 1800 psig and the
abandoned pressure was around 1100
psi.
Well
No. 4:
This
well was drilled in 1962. After
drilling a total depth of 1032 feet,
high pressure gas and water started
coming out with great intensity.
The well was abandoned due to safety
and technical reasons.
Well
No. 5:
This well was drilled in 1969 besides
well no 4 as an observation well.
After drilling a total depth of
1885 feet, it was also abandoned
due to technical reason.
Well
No. 6:
This well was successfully drilled
in 1964. The total drilling depth
of the well is 4610 feet. The well
was completed as dual producing
well like well 3 in the same upper
and lower bokabil sand. The perforating
depths were 3980 to 4030 and 4290
to 4320 feet upper and lower sand
respectively.
Since
inception gas was produced @ 10-15
MMCFD from both the sands. Gas production
from lower sand was suspended on
November 1993 due to excessive water
& sand production.
However,
Gas production from upper sand is
continuing till today with limited
quantity of 5.5 MMCFD. The flowing
well head pressure at present is
1180 psig which was around 1600
psig initially. Cumulative Gas production
from this well is 79.84 billion
cubic feet untill June, 2002.
After
37 years of non stop production,
well no 6 is in the last stage of
recovery. Production may stop anytime
due to natural breakthrough of water.
Well
No. 7:
Sylhet well No 7 was spud on 12th
September, 1986 by the drilling
contractor BAPEX with an objective
to drainage the remainder up-dip
gas of Sylhet structure which could
not be tapped through well no 6
& 3. The total drilling depth
of this well was 2065 meter. During
the drilling a potential oil zone
was detected with in the interval
of 2009-2033 meter. The well was
completed as oil producer after
perforating the interval 2020-2033
meter. This is the first discovery
of mineral oil in the country.
Initially the oil production was
around 350 barrels per day with
negligible water cut. However, with
time a gradual production declining
trend had become apparent. After
07 years of more or less uninterrupted
production of total 560869 barrels
of crude oil, the well ceased its
production on 14th July, 1994. The
natural well head pressure was zero
at that time.
The
1st work over of Sylhet-7 was completed
as gas producer in March 2005 with an initial
production capacity of 15MMCFD.
The Gas production ceased
in July 2008.
The
2nd workover of Sylhet-7 has been successfully completed in the existing perforation zone on February 2, 2010. The commercial gas production from sylhet-7 will be started soon. At this stage, 6-8 MMSCFD gas will be produced from Sylhet-7 well.
PROCESS
PLANT
A 30-MMCSFD capacity silicagel type
gas dehydration plant with condensate
fractionation facilities has been
in operation at Haripur Field to
process and supply the gas produced
from the wells of this field. The
present ratio of condensate recovery
from this field is around 3.5 barrel
per MMSCF of gas. Heavy condensate
extracted here is split into motor
spirit and kerosene oil. The light
condensate conforms to aviation
grade motor spirit.
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