Schlumberger last month announced the availability of two high-temperature additions to its reservoir characterization portfolio: the PressureXpress-HT reservoir pressure service and MDT Forte-HT qualified, rugged, high-temperature formation sampling and pressure system. Rated to 450°F (232°C) the PressureXpress-HT tool (pictured) provides accurate pressure gradients and overall data quality not achievable by conventional high-temperature formation tester tools, said Schlumberger.
The tool’s dynamically controlled pressure pretest system enables precise control of volume and drawdown rates, making pressure testing possible in tight formations common in HP/HT reservoirs.
The tool design also eliminates the need for gauge temperature stabilization, thus significantly improving overall operational efficiency.
In field testing in Thailand and the North Sea, the enhanced pretest system enabled successful pressure measurements at multiple depths to produce profiles of pressure versus depth and establish accurate reservoir pressure gradients to determine fluid contacts.
The new MDT Forte-HT system has been designed to provide greater all-round robustness in formation sampling and testing operations up to 400°F (204°C). It boasts a redesigned electronics system, incorporating surface-mounted components on a ruggedized chassis to protect sensitive electronics when operating in harsh high-shock and high-temperature logging conditions.
There is also a new-generation HP/HT quartz gauge, high-performance packers for the dual-packer module and advanced sealing technology; and a high-temperature Quicksilver Probe focused fluid extraction tool that provides near contamination-free fluid samples.
‘Providing a full suite of HP/HT evaluation tools is a major engineering focus within Schlumberger. These two tool systems expand our capabilities to deliver reliable downhole fluid analysis, fluid sampling, pressure measurement and interval pressure transient testing,’ said Catherine MacGregor, president, Schlumberger Wireline.
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