Multi-zone Subsea Completions in the Dai Hung Field, Vietnam
- Kevin R. Lay (BHP Petroleum Pty. Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 1996
- Document Type
- Journal Paper
- 185 - 190
- 1996. Society of Petroleum Engineers
- 5.2.1 Phase Behavior and PVT Measurements, 5.1.2 Faults and Fracture Characterisation, 3 Production and Well Operations, 4.2 Pipelines, Flowlines and Risers, 1.6 Drilling Operations, 4.1.9 Tanks and storage systems, 1.8 Formation Damage, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 4.5.3 Floating Production Systems, 7.3.3 Project Management, 3.1.6 Gas Lift, 1.10 Drilling Equipment, 4.5.7 Controls and Umbilicals, 4.2.3 Materials and Corrosion, 2.2.2 Perforating, 4.1.5 Processing Equipment, 5.1 Reservoir Characterisation, 1.7.5 Well Control, 3.3.1 Production Logging, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 2 Well completion
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The early production phase of the Dai Hung field development resulted in the drilling and completion of five subsea wells. Due to the complex nature of the reservoirs, selective multi-zone completions were installed for effective reservoir data acquisition and reservoir management, The downhole completion designs utilised equipment which was primarily of existing proven design and downhole equipment installation was successfully achieved in a single trip. Ongoing reservoir management will be aided by the use of a subsea wireline system to facilitate data acquisition.
The Dai Hung field is located offshore southern Vietnam in Block 05-1(a), about 270 km southeast of Vung Tau (Fig. 1) in 110 m of water. The Dai Hung field was discovered by Vietsovpetro in 1988 and two additional appraisal wells were subsequently drilled and tested by Vietsovpetro. BHP Petroleum (Dai Hung) Pty. Ltd., in a joint venture with Vietnam Oil & Gas Corporation - PetroVietnam, Petronas Carigali (Dai Hung) Sdn. Bhd., TOTAL Vietnam and Dai Hung Oil Development (Japan) Ltd. (DOD - Sumitomo et al), acquired operatorship of Block 05-1(a) in April 1993 with the signing of a production sharing contract with the Vietnamese government and immediately embarked upon a fast track early production system (EPS) project as the first phase of the Dai Hung field development.
The semi-submersible floating production unit (FPU), Deepsea Pioneer, previously operated by BHP Petroleum subsidiary, Hamilton Oil Company, had been identified as being suitable for the Dai Hung EPS project and flexible development plans utilising subsea appraisal and development wells tied back the FPU were progressed.
Between August 1993 and May 1994, seven appraisal and development wells were drilled by BHP Petroleum and four of these wells were completed as subsea oil production wells during the period May to August 1994. Oil production commenced from the Dai Hung field in October 1994 after the installation of field facilities including the renamed FPU, Dai Hung - 1, catenary anchor leg mooring (CALM) buoy and floating storage and offtake (FSO) vessel, Hikari Orient. An additional two wells were drilled between May 1994 and January 1995 and the fifth production well was due to be completed and commence production during early 1995.
Geological and Reservoir Description
The Dai Hung field is located within the South Con Son basin, in a crestal position on a major northeast trending tilted block. Granitic Basement lies at a depth of approximately 2600 m at the shallowest part of the field.
Highly faulted Clastic sediments, about 800 m thick, rest unconformably on the Basement and are overlain by a Carbonate platform of up to about 200 m thick.
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