Electro Magnetic Wireline Retrievable-Surface Controlled Subsurface Safety Valve: A New Backup For Surface Controlled Subsurface Safety Valve To Avoid WorkOver

Abstract

The scope of this document is to summarize the field trial of Expro FlowCaT and Geoservices GEM-Valve Wireless Electromagnetic Surface Controlled Sub-surface Safety Valve in Fiume Treste field, in sud of Italyt and provide a final technical evaluation. In 2007, COMP started a study about existing Surface Controlled Sub-surface Safety Valve, to have a complete knowledge of their status in worldwide wells and to make a statistic analysis of the most common failures.The control line‟s failure is the most critical, since it prevents the installation of a contingency WR-SCSSV, which would be impossible to control. In these cases, the only available contingency, till now, was the installation of a SSCSV (Sub-Surface Controlled Safety Valve), but it doesn‟t guarantee the same level of reliability as the SCSSV‟s: These valves are not controlled from the surface, they are not fail-safe and they are operated by particular events on the well (such as high flow rate or low pressure), which are very uncertain. To address this issue, COMP made a survey with valves‟ suppliers and a solution to, this problem was identified in the new wireless electromagnetic technology. After a strict “ISO-modified” qualification process and a 6-months field installation in a STOGIT gas storage well with monthly tests and a final slam test, both the considered Electromagnetic Wireless Surface Controlled Sub-surface Safety Valves: Expro 3.65” FlowCaT & Geoservices 3.72” GEM-VALVE are considered qualified and field proven to be installed in eni wells.

Study on Quantitative Evaluation Method for Failure Risk Factors of the High-Temperature and High-Pressure Downhole Safety Valve

“…The reliability of downhole safety valves is directly related to the production safety of oil wells, so it is necessary to carry out research on risk evaluations and reliability analyses of downhole safety valves. There have been many studies on the design and manufacture of downhole safety valves [2][3][4][5][6][7][8]. However, there are not many studies on the reliability of underground safety valves.…”