Production & Field Development
Crude and condensate production averaged at 42,100 BOPD. The black oil rate reached a high of 39,300 BOPD in February 2018, and averaged 38,200 BOPD for the year.
Several key projects and well intervention activities were implemented in 2018 to improve oil and gas production. These projects included:
- Commissioning of two ZeroP skids
- Implementation of low pressure system for beam pump wells
- Commissioning of 3 automated Continuous Demulsifier Injection (CDI) skids
- Completion of 514 workovers and new completions. 250 wells out of 514 jobs were stimulated during rig operations and 191 were stimulated rig-less to improve well productivity
- Implementation of new techniques to increase well production, including:
- Surge frac: high pressure, high rate acid stimulation treatment.
- Ahmadi horizontal wells commingle completion
- Continuation of the application of engineering and chemical solutions by installing coated tubing and downhole chemical treatments in beam pump wells
A total of 69 new oil wells were successfully commissioned, which contributed to the addition of around 3,500 BOPD of oil production by December 2018.
Total Khuff gas production averaged 1,430 million standard cubic feet per day (MMSCFD), with a peak production rate of 1,860 MMSCFD in June.
In addition to core activities of carrying out Turn around and Inspections (T&I), Preventative Maintenance jobs (PMs) and corrective work orders, the Field Maintenance Department was also involved in the commissioning of various new facilities.
Maintenance programs were aimed at enhancing mechanical integrity, reliability, and safety of field assets to ensure uninterrupted delivery of oil to the refinery and non-associated gas to delivery points.
The total maintenance man-hours worked during 2018 was over 863,000.
Gas Distribution and Sales (GDS)
Drilling and Subsurface Development
3 new Khuff gas wells and 69 new oil wells were drilled in 2018, targeting the Rubble, Ahmadi, Mauddud and Kharaib reservoirs, bringing the total number of new wells drilled since Tatweer’s inception in 2010 to 1,021, including 7 Khuff gas wells. The new wells drilled in 2018 were all primary wells, which resulted in the production of an additional full year average of 1,967 BOPD.
Performance and drilling efficiencies continued to be achieved with faster, cost efficient, and better wells being drilled. Drilling efficiencies continued to improve, meeting the planned cost per foot and feet per day with reduction in Non-Productive Time (NPT) and overall reduction in well drilling times.
Tatweer Petroleum continued further technical assessment and reservoir development for several reservoirs in the Bahrain Field with the expansion of the Rubble Thermal Pilot Phase-6 as well as steam and gas injection pilots’ initiation in Ostracod and Magwa Reservoirs. The Company continued Crestal gas injection including completion of fracturing wells with incremental oil gain in the Ahmadi Reservoir.
Facilities Engineering & Construction
As part of the Non-Associated Gas (NAG) Long Term Field Development plan, work under the Engineering, Procurement and Construction (EPC) contract was awarded in September 2015 for the installation of a 500 MMSCFD Gas Dehydration Unit (GDU) and associated pipelines and well head facilities. The project commenced in February 2018 and final optimizations are being continued with gas dehydration rates being increased as required.
Two new thermal patterns were successfully installed as part of Rubble Steam Injection Pilot (RSIP) Phase VI expansion. This pilot has now shown the most successful thermal results, with the lowest Steam Oil Ratio (SOR) to date.
An additional 50 beam pump wells were connected to the 11 KV network, bringing the total number of phased-out beam pump rental diesel generators, converted to permanent power, to 579 in 2018.
The control system upgrade was completed at the remaining 3 remote oil well manifolds in 2018. The project achieved better surveillance and control from the Central Control Facility (CCF) through fiber optic connectivity, thereby bringing the entire oil, water and steam production into the high speed fiber optic network.
A total of 8 GDUs and 73 BPUs were hooked to the fiber optic network in 2018. The fiber network expansion, which was initiated in the northern region, was completed in addition to extensive fiber network infrastructure upgrades throughout the Bahrain Field.
To support the Umm Al Naasan (UAN) exploration project, fast track EPC was completed to enable completion for 2 well pads and associated fracking civil works by December 2018.
The 2018 well development program added 69 new wells to the Bahrain Field that consists of 35 gas lift wells and 33 BPUs, which are currently producing from Ahmadi, Bahrain, and Kharaib Reservoirs.