Ten giant oil fields in
Iran account for the bulk of Iran's oil production. But these fields are all in
the second half of their lifecycle. Insufficient investment in them, over
years, has left their recovery rate at a low level. As a result pressure
fall-off in these fields is highly likely while they have great potential for
higher production. Ab Teimour which was discovered 50 years ago and its current
output stands at 60,000 b/d is one of these fields. Bangestan reservoir of this
field was one of 12 projects National Iranian South Oil Company (NISOC) offered
for international investment under the new contractual framework (IPC) in
Ab Teimour in Khuzestan
province is located 25 kilometers west of Ahvaz. It is between Mansouri and
Susangerd oil fields. Ab Teimour was discovered in 1961 after seismic test. A
first well was drilled there six years later to prove the existence of oil.
However, production from Ab Teimour began in 1991. Ab Teimour measures 23
kilometers in length and 6 kilometers in width. According to primary
calculations, it is estimated to hold at least 15.2 billion barrels of oil in
production stands at 60,000 b/d from 50 wells (29 wells in Ilam formation and
21 wells in Sarvak formation).
Ab Teimour is
administered by NISOC, but its production operations are handled by Karoun Oil
and Gas Production Company.
In the 130th
meeting of the committee of reservoir consultants of National Iranian Oil
Company (NIOC), the general plan for the development of Bangestan was discussed
in three phases – natural depletion, artificial lifting and water and gas
Given uncertainty of some
data and in the light of completing reservoir data, development of Ab Teimour
was designed in pre-phase and full-phase stages.
In the pre-phase stage,
necessary data is gathered and pilot tests are conducted so that the
development project would be updated and finalized. Based on the existing
information, the pre-phase flow is forecast at 55,000 b/d and the full-phase
flow at 110,000 b/d.
Over recent years, many
foreign companies have expressed readiness to develop this field, but due to
international sanctions, agreements were terminated. Recently, several
companies including Russia's Lukoil agreed to submit the results of preliminary
studies on this field to NIOC in the near future. Lukoil opened its Tehran
office in April 2016; just months after sanctions were lifted on Tehran following
the implementation of Iran's historic nuclear agreement with six world powers,
known as the Joint Comprehensive Plan of Action (JCPOA).
Iran's Ministry of
Petroleum has given the Ab Teimour data to several companies in order to
examine various scenarios by rivals. Each company has submitted a separate
proposal to NIOC. Indonesia's Pertamina has suggested 250,000 b/d production
and Lukoil 150,000 b/d. Denmark's Maersk plans different scenarios including
200,000 b/d, 300,000 b/d and 450,000 b/d production. Maersk's 450,000 b/d
plateau could remain for four decades and this company must operate the field
for a longer period of time. Such output would be reached in case the recovery
rate of Ab Teimour is enhanced from the current 2.27% to 12%.
Technical studies by
Iranian experts show that the field's output could be increased up to 95,000
b/d. Ab Teimour is estimated to contain 15 billion barrels of oil in place and
so far 315 million barrels has been recovered from the Bangestan reservoir.
Near this reservoir is erected a production unit with the rated capacity of
55,000 b/d, a desalting unit with the capacity of 55,000 b/d and a gas pressure
booster unit with the nominal capacity of 20 mcf/d.
Experts and specialists
at NIOC have processed and interpreted 3D seismic test data and identified a
new reservoir structure which contains around 2 billion barrels of oil in
As the Bangestan
reservoir pressure and the wells' stream pressure change, artificial lifting of
Ab Teimour in the Bangestan reservoir was planned. This project is now in its
final stages and the flow of oil wells from Ab Teimour will be stabilized after
artificial lifting system is installed.
Courtesy of Iran Petroleum