Design, Installation and Optimization of High Pressure/High Rate Offshore Gas Fields
- Elio Antonio Uzcategui (Saudi Aramco) | Abdulrahman Ahmari (Saudi Aramco)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 25-28 September, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 4.2.3 Materials and Corrosion, 4.3.4 Scale, 2 Well Completion, 1.10 Drilling Equipment, 2.4.3 Sand/Solids Control, 2.2.2 Perforating, 3 Production and Well Operations, 7.4.5 Future of energy/oil and gas, 4.1.5 Processing Equipment, 1.6 Drilling Operations, 4.1.2 Separation and Treating, 4.5 Offshore Facilities and Subsea Systems, 4.2 Pipelines, Flowlines and Risers, 3.3.1 Production Logging, 1.1 Well Planning, 4.3.1 Hydrates
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To meet gas demand, Saudi Aramco is developing three new offshore gas fields with a relatively low number of high rate gas wells. These fields have the particularity of having a very high-pressure and high content of H2S and CO2 in its gas composition.
To develop these fields, a concept of multi-slot platforms with highly deviated wells and 7?? monobore completion was initially considered. Later, due to several challenges, a full review of the well construction and completion was carried out for these three fields to be able to minimize risks and achieve the production target.
The new development schemes implemented are considering double annulus seals to avoid communication and to ensure proper formations isolation, relocation of the tubing retrieval subsurface safety valve, operational wells cleanup procedure to ensure production solids free at a higher production rate, and 7?? and 9???? monobore completion for production tubing to achieve the production target and minimize requirement.
This paper discusses the new development approach and completions, including the basis for the design.
These fields are located approximately 150 km Northeast of Dhahran, Fig. 1, in water depths that vary from 50 m to 60 m. The discovery well (K-1) was spud in 2005 and later in 2006 and 2007, more delineation wells, K-2 and K-3, were drilled to define the structure, reservoir extension and complexity. The other two field discoveries came later as part of the exploration campaign implemented by Saudi Aramco in the offshore area. The geological structures of these fields are monoclinal with faulting in the Northwest direction.
In 2008, a full development drilling campaign was initiated in four platforms. Wells were drilled in batch to optimize well delivery and rig time. The other two fields which are expected to be completed with bigger tubing size are planned for later production when all wells, facilities and requirements are finished and installed.
These three fields are going to produce from the same formation. The reservoir has an average thickness of 1,000 ft at a depth of 12,500 ft with a reservoir pressure around 10,000 psia and temperature of 290 ºF.
Fields K, B and A were selected to be developed based on exploration results and prospectivity to cover future gas demand. Liquid separation facilities and processing plants are located onshore. Large multiphase pipelines are the link between the tie-in platform and the onshore processing facilities.
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