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AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain

Integrated Reservoir Management Leads to Improved Productivity from Khuff Gas Reservoir of Bahrain Field

Challa RK Murty1; Salah S. Abdulla1; Ebrahim Alowainati1

(1) Petroleum & Exploration, Bahrain Petroleum Company, Manama, Bahrain.

Bahrain Field is a mature asset containing several oil and gas reservoirs. The bulk of Gas reserves are located in Khuff and Pre-Khuff (Unayzah) reservoirs. The Khuff is a carbonate reservoir that is subdivided into four units - KO , K1, K2and K3. These gas reserves are vital for the country because they represent the main domestic energy supply. All the subunits are highly productive except K3 where the production is marginal as it is derived mainly from the fractures.

An integrated Reservoir monitoring is in place to improve the asset management of this critical resource. This includes (a) updating reservoir description using the data from Core Analysis (b) ensuring proper depletion by monitoring the reservoir pressure, (c) reviewing the production performance from various units, (d) recording the deliverability of wells periodically (e) revising the perforation intervals based on the rock typing and (e) monitoring the movement of Gas water contact.

A yearly surveillance program is implemented regularly to acquire data from the reservoir. The deliverability of the wells is monitored using the SCADA system. A study on the system pressure reduction was undertaken which indicated that the productivity can be enhanced by reducing the well head tubing pressure. Accordingly the gas dehydration units are being modified to handle production with low well head pressures. The reservoir perforation policy is also revised using the study which helped in improving the productivity. This paper discusses how the integrated study helped in providing a good frame work needed to assess the best ways to improve the exploitation of the gas reserves.