Adapting cavity pumps to meet new, unconventional challenges ///
Global demand for crude oil and natural gas continues, unabated. Prices are rising, and interest in opening up new reserves, including those from unconventional sources, is growing. Methane from coal seams and highly viscous oil, at more than 10,000 millipascal/sec (mPas), are already of commercial interest today, but they are just as complicated to extract as oil-sand mixtures from the Sudanese desert.
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