Through-Tubing Rotary Drilling From Njord Floating Platform
- Jan I. Tistel (Hydro Oil and Energy) | Joy S. Oyovwevotu (Leading Edge Advantage Ltd.) | Saifullah Talukdar (Hydro Oil and Energy) | Kare Kjosnes (Hydro Oil and Energy) | Lill Harriet Brusdal (Hydro Oil and Energy)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2007
- Document Type
- Journal Paper
- 313 - 325
- 2007. Society of Petroleum Engineers
- 1.4.1 BHA Design, 4.2 Pipelines, Flowlines and Risers, 5.4.2 Gas Injection Methods, 4.1.5 Processing Equipment, 2.2.2 Perforating, 4.2.4 Risers, 3 Production and Well Operations, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.10 Drilling Equipment, 5.6.4 Drillstem/Well Testing, 2.4.3 Sand/Solids Control, 4.5.3 Floating Production Systems, 1.7.6 Wellbore Pressure Management, 1.2.5 Drilling vibration management, 5.5.2 Core Analysis, 5.1.2 Faults and Fracture Characterisation, 1.6.6 Directional Drilling, 1.6.8 Through Tubing Rotary Drilling, 5.1.5 Geologic Modeling, 5.1.7 Seismic Processing and Interpretation, 5.2 Reservoir Fluid Dynamics, 1.7 Pressure Management, 6.1.5 Human Resources, Competence and Training, 5.1 Reservoir Characterisation, 5.6.1 Open hole/cased hole log analysis, 1.1 Well Planning, 2 Well Completion, 4.5 Offshore Facilities and Subsea Systems, 1.5 Drill Bits, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 4.3.4 Scale, 1.14 Casing and Cementing, 1.12.2 Logging While Drilling, 1.11 Drilling Fluids and Materials, 4.2.3 Materials and Corrosion, 5.7.2 Recovery Factors, 1.6 Drilling Operations, 1.7.5 Well Control, 1.6.2 Technical Limit Drilling, 1.6.1 Drilling Operation Management
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The densely-faulted Njord reservoir in the Norwegian North Sea is considered one of the most complex reservoirs in the world. The field is developed from a semi-submersible platform with 15 subsea-completed wells drilled in a pre-drilling campaign in 1996 to 1997 and two major platform drilling campaigns, one in 1997 through 2000 and the other in 2002 to 2003. Drilling of two conventional sidetracked oil producers in the last campaign was challenging and costly. As the field matures, the need for a cheaper way of drilling sparsely located smaller undrained compartments became essential. This led to initiate an ambitious campaign called the low-cost infill targets (LIFT) for identifying and drilling those targets using a cheaper drilling technique called the through tubing rotary drilling (TTRD).
TTRD is a hugely demanding task especially, from a floating platform as any economic rationale will be lost if completion accessories and well integrity are compromised through TTRD. To the best of our knowledge, no TTRD operations have previously been executed from a floater. The severity of depletion, especially with depletion and re-pressurization (Huff'n Puff) of parts of the reservoir provides a significant technical test and challenge for TTRD on Njord. The relative movement of the floater also presents extra operational challenges, which requires accurate measures to prevent damage to the tubing hanger, Christmas tree (XMT), downhole-safety valve, and existing completion string. Issues related to bottomhole assembly design to meet drilling and production needs, mud rheology, equivalent circulating density (ECD) management, rock mechanics, and completion techniques are critically analyzed and risk-reducing or eliminating measures are put in place through extensive research and development for each of the prospective targets.
This paper is intended to give a comprehensive description on the technological challenges of the TTRD technology from a floating platform, research and development activities to qualify the technology on Njord, screening of drilling targets and the drilling experiences from two TTRD wells on Njord.
The Njord Field is located in blocks 6407/7 and 10 in the Haltenbanken area of the Norwegian Continental Shelf approximately 130 km northwest of the operations base in Kristiansund. The field was discovered in late 1985 and went on production on 30 September 1997. Considering deep water (330 m) and limited area distribution of the reserves (6 km in diameter), the Njord Field was developed by a semi-submersible platform with production, drilling, and living quarters (PDQ) located directly above the subsea completed wells. The subsea-completed wells are connected to the platform via flexible risers. The produced oil is stored in a floating storage and offloading unit 2.5 km away from the production platform (Fig. 1).
The commercial reservoir comprises the Lower Jurassic Tilje and Middle Jurassic Ile Formations in the three main areas in block 6407/7 namely, the East Flank and the Central- and Northern Areas (Fig. 2). However, the Tilje Formations constitute the main reservoirs with 89% of the total in-place oil volumes. The current in-place oil estimate for the Tilje reservoirs is 108.4 MSm3. A total of 17.9 MSm3 of oil has been produced by January 2005, which constitutes an overall oil-recovery factor of only 16.5% for this formation. The reasons for this kind of low-recovery factor are mainly two fold: depletion drive is the preferred production mechanism for the Central- and the Northern Areas, and the reservoir is heavily faulted leaving some of the fault compartments undepleted. Because of this low recovery factor, the need for improving the overall recovery factor is paramount.
|File Size||3 MB||Number of Pages||13|
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