The long horizontal hole project announced in Q4, 07 as one of the strategic options to develop the tight reservoirs as 20 Billion barrels of proven oil reserves are known to be trapped in Low Permeability Reservoirs (LPR) in ADCO

• Nov. 2007: ADCO conducted LPR Forum
  
  
  • Conclusion: MRC / longer horizontal hole is one of the most feasible solutions to enhance LPR performance
• Jun. 2008: ADCO organized workshop w/ ADNOC, ZADCO, ADMA, NDC, Service Providers on long horizontal holes. The value driver for this project is to have better sweep efficiency in water injector wells (WIW) in ASAB field, minimize number of injector wells and to save rig foot print by drilling one well instead of 2 so that, according to the reservoir modeling it was decided to drill 10,000 ft of H.H to cater for 2 wells (Standard well is 5000ft H.H section).
• The initial feasibility study conducted by Center of Excellence (COE) showed a potential saving of this project in ASAB field zone-A with a potential to expand it across all ADCO tight reservoir.
  
  
  • Conclusion: It is technically feasible; favorable economics
• ADCO management supported the project and considered it as one of "7 Must Do's" in 2009. Technology focused group (TFG) formed and led by ASAB RDD Team Leader in order to drill 2 pilot wells with 10,000 ft H.H equipped with Distributed Temperature Sensing technology (DTS).
• TFG (RDD, DD, and COE) start planning the well utilizing all the available technology, software and engineering analysis to deliver the well successfully.
• The planning stage for this project consists of 3 steps:
  
  
  • DD engineering team set the preliminary well design
  • Review the design with COE
  • Hired 3rd party to verify and consolidate

Challenges

• The main challenge in planning this project was to suit the existing conventional Light Casing Design (LCD) to the project design in order to obtain the optimum cost, and maximize the saving in material consumption.
• The other challenge was to set a robust design and plan to deploy the Distributed Temperature Sensing (DTS) in order to save the production logging tool and to have a contentious monitoring for the injected water across the horizontal section.

Achievements

The team managed to design the well and procure all the required material across 2009 with support from ADCO center of excellence (COE), Sensornet, and K&M. It's expected to drill the 1st well in Mar,2010, and team will provide update on the actual delivery.