Mitigate drilling risk and minimize cost when drilling to HPHT reservoirs.
Drilling HPHT formations involves numerous challenges. Wellbores are often deep and experience a narrow pore pressure / fracture gradient operational window. Drilling the HPHT intervals often involve significant non-productive time. These problems often require additional casing points to be added to the well plan, which can compromise attaining the desired wellbore ID or well TD in the objective reservoir.
Drilling and completion costs rise due to high non-productive time. The cost of non-productive time related to HPHT problems can negate positive well economics if not planned for in the initial well design.
Enventure expandable open-hole liners (OHL) are often planned into the base casing design to mitigate the risk in HPHT wells. Typical sizes used in these applications range from: 11-3/4 in. expandable OHL (for base casing of 14 in.), to 5-1/2 in. (for base casing of 7 in.). Expandable OHL's are often used to cover a problematic zone providing an increased wellbore ID. This process maintains required wellbore pressure and collapse ratings.
Certain OHL sizes are available in High Performance (HP), with a thicker wall that provides higher collapse and yield pressures - often at or exceeding the rating of the base casing. Sizes available are: 7-5/8 x 9-5/8-in., 8-5/8 x 10 3/4 in. and 11 3/4 x 13 3/8 in. Technically difficult wellbores are now planned in a 16 in. and/or 13-3/8 in. expandable liner to enable larger casing prior to drilling through the HPHT intervals.
The SET® Chart provides a table of all the standard sizes available or you can use the SET® Designer to configure a system based upon your parameters.
The use of Enventure's expandable OHL technology in HPHT wells has saved operators $50 to $100 million in well re-drilling costs. More importantly this technology has enabled multi-billion-dollar offshore development programs to proceed as planned, allowing hundreds of millions of boe to be recovered.
