Big Bore Expandable Liner Hangers for Offshore and Deepwater Applications Reduces Cost and Increases Reliability: Global Case History
- John Mccormick (Halliburton) | Marilyn Matice (Halliburton) | Steve Cramp (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPETT 2012 Energy Conference and Exhibition, 11-13 June, Port-of-Spain, Trinidad
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.1.1 Exploration, Development, Structural Geology, 6.5.3 Waste Management, 4.1.5 Processing Equipment, 1.10 Drilling Equipment, 4.1.2 Separation and Treating, 1.6 Drilling Operations, 1.14 Casing and Cementing, 1.3.2 Subsea Wellheads
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Reducing rig time and material costs for offshore wells is critical to a project's financial profitability. With the dramatic increase in the number of deepwater wells, new technologies and methods are needed to quickly and reliably complete wells. A case history of 14 large-bore expandable liner hangers (ELHs) in the Caspian Sea and one in deepwater Gulf of Mexico (GOM) show consistent material cost savings, reduced installation time, improved reliability, and increased versatility over the conventional liner hanger system.
The technological advances of ELH systems have increased well life and improved safety during liner installations over traditional systems. Sealing capabilities with expandable systems have evolved beyond conventional tools and the smooth radial flowpaths allow for greater ease of installation. A series of redundant sealing elements provide a gas tight liner top seal which stops any possible gas migration. Also, with the ELH system, rotation and reciprocation while cementing are possible.
This paper will describe offshore wells and the common problems associated with them. Expandable liner hanger technology will be explored to increase operator awareness of an additional technology. An in-depth exploration of ELH technology and the comparison of conventional and ELH systems in the same field are described within this paper.
Offshore and deepwater exploration and development wells are becoming more prevalent and the costs associated with these wells are significantly higher than those drilled and completed on land. Solutions for decreased material costs, reduced installation time, improved reliability, and increased versatility are needed. Specific problems associated with conventional, large OD liners include the necessity for pinpoint precision placement in designated profiles using locator subs, the inability to rotate during cementing, risks associated with blowouts during and after installation, exposure to large OD liners over long lengths in the wellbore and small flow areas resulting in high pressures while cementing.
Caspian Sea Wells
All of the Caspian Sea wells were run from platforms approximately 125 meters above mean sea level (MSL). The inclination of the deviated sections of these well ranged from 55 to 75 degrees with total measured depths of approximately 5,000 m, the longest of which was 5,612.8 m MD. The top of 16-in. liner (TOL) depths ranged from 200 to 342.5 m MD, with 16-in. liner depths from 1,505 to 2,902 m. Table 1 shows the inclinations, the liner depths, and the top of the liners (TOL) for 5 of the Caspian Sea Wells. Figure 2 shows a large-bore ELH system about to be run below the rotary table.
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