Improving Well Integrity in Permanent Downhole Monitoring Systems
- Thomas Engel (Weatherford) | Chris Baldwin (Weatherford) | John Grunbeck (Weatherford) | Jason Kiddy (Weatherford) | Kaj Stokkeland (Weatherford)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 05-08 May, Houston, Texas
- Publication Date
- Document Type
- Conference Paper
- 2014. Offshore Technology Conference
- 3.2 Well Operations, Optimization and Stimulation, 2.3.2 Downhole Sensors & Control Equipment, 2 Well completion, 1.3 Wellhead design, 1.3.1 Surface Wellheads, 3.3 Well & Reservoir Surveillance and Monitoring, 5 Reservoir Desciption & Dynamics, 5.6.11 Reservoir monitoring with permanent sensors, 2.3 Completion Monitoring Systems/Intelligent Wells, 3.3.4 Downhole Monitoring and Control, 3.2.9 Lifecycle Management and Planning, 3 Production and Well Operations, 5.6 Formation Evaluation & Management
- Well Head Outlet, Optical Connectors, Well Integrity
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Well integrity has become an increasingly important issue for oilfield components. Stricter testing procedures and qualification requirements are becoming more prevalent for primary well fluid containment devices. This is being extended to well monitoring systems, including those permanently installed on well completions using electronic or optical cables. One example is the new fire test requirement for Optical Well Head Outlets (OWHO) per Statoil's document TR3540, Surface wellhead and christmas tree system, with procedures defined in API 6FB: Fire Test for End Connections. Operators are also demanding increased reliability for downhole systems. Ensuring that the seals are properly installed and functional in drymate connectors and pressure foot devices is critical.
This paper discusses the development and qualification of an OWHO that meets API 6FB. Key design issues such as thermal coefficient of expansion differences of materials, seal evaluations, and feed-through issues as related to surviving the extreme temperature conditions of the flame test are discussed. Development and testing of pressure-testable multipin drymate connectors and an improved pressure foot design is also discussed.
Development of highly reliable downhole components requires significant design and testing. For the OWHO, an internal pressure of 11, 250 psi (775.7 bar) was maintained while the wellhead outlet was brought to a temperature that exceeded 900°C (1, 652°F), with the internal feed-through exceeding 650°C (1, 202°F) during the test. The OWHO experienced no leaks at any stage of the qualification testing. The design of the pressure-testable drymate connector and pressure foot has been developed to qualify for infield hydraulic tests.
The OWHO met the harsh environment requirements of TR3540 through a successful flame test carried out in accordance with API 6FB. The newly designed drymate connector and pressure foot provide a reliable, field-testable solution representing a significant step forward to ensuring well integrity.
|File Size||37 MB||Number of Pages||9|