New technology for offshore steam-flooding has taken its next step toward North Sea reality. Aberdeen-based oil and gas production technology business Pragma Well Technology said a successful feasibility study has led to a green light from Pharis Energy and OGTC to progress with the manufacture and prototype testing of its Downhole Steam Injection Valve (DSIV).
Pragma said the surface controlled DSIV will be the 1st steam injection valve available on the market to meet U.K. safety regulations. The valve, which uses advanced materials, detailed fluid design and innovative engineering features, will be rated to withstand the extreme downhole conditions required for continuous high-pressure steam injection, and will operate at temperatures of up to 343 degrees Celsius.
Owing to Pragma’s surface controlled design, the DSIV technology will also be able to be used in other extreme high temperature developments around the world. These could include production or geothermal wells, providing the DSIV with considerable applications and advantages for a wider market, the company said. The production safety valve variant, the Extreme Temperature Safety Valve, also incorporates ESP cable bypass capability which will allow the installation of downhole pumps, it added.
The DSIV is a key enabling technology for the implementation of offshore steam-flood and Pharis will use the DSIV valves to protect well integrity, as the company progresses a steam assisted, phased development of the Pilot field, which lies in U.K. continental shelf (UKCS) block 21/27a.
This project will start with a steam-flood trial injecting up to 36,000 bcwe/day (barrels of cold water equivalent) of steam into the southern part of the Pilot field. The full scale steam-flood is aiming for approximately 50 % recovery (over 120 mmbbls), about 3 times as much oil as would be expected to be recovered using the standard cold water-flood techniques used in most North Sea heavy oil projects to date.
«Applying steam-flooding technology in the UKCS has the potential to unlock an additional 4 billion barrels of otherwise stranded reserves from the shallow heavy oil fields that have already been discovered in the basin,» said Steve Brown, CEO of Pharis.
«Steam-flooding has the potential to transform the economic prospects of a number of marginal fields, attract new investment to the basin and stimulate exploration of previously neglected plays. The creation of a thoroughly tested and appropriately rated safety valve is critical to enable these operations to commence, and for steam based recovery techniques to make their contribution to maximizing economic recovery from the UKCS.»