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- W23243318 abstract "To successfully produce ultradeep gas (below 25,000 ft), advances will be needed in geoscience and engineering. Combined thinking from experts in geology, geophysics, geochemistry, and engineering has outlined some of the challenges. Geologists will require assistance from geophysicists to identify the spatial distribution of sedimentary rocks. They will need to interpret the structural and tectonic framework and fit them into an integrated geological model. Characterization of potential reservoirs including knowledge of the preservation or creation of porosity will be vital. Although seismic methods have the highest resolving power for delineating structure at depth and indicating other rock properties, other geophysical methods should also be utilized for additional information on deep sediments. A better understanding of the source requirements and chemical reactions for generation of methane is required. Methane can survive at high temperatures and high pressures associated with depths of 40,000 ft in an inert dry reservoir, but the stability of methane in the presence of complex mixtures of minerals and other fluids is uncertain. Further experimental studies and theoretical work are needed to understand the constraints on methane preservation. Severe problems will be encountered in drilling, evaluation, and completion of ultradeep wells. Engineering challenges will come from higher in-placemore » stresses, temperatures, pressures, and the probability of encountering corrosive and toxic fluids. Drill strings, casing, and other tubular materials used in the drilling and well completion process will need advanced metallurgy to reach and complete wells in deep targets. The economic returns at $3.00 per Mcf can be attractive if 200 ft of gas within a 7 percent porosity reservoir can be successfully completed at 30,000 to 40,000 ft. This assumes good productivity and draining gas reserves of 125 Bcf from a single well. 6 refs., 5 figs.« less" @default.
- W23243318 created "2016-06-24" @default.
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- W23243318 date "1993-01-01" @default.
- W23243318 modified "2023-09-26" @default.
- W23243318 title "Challenges of ultradeep drilling" @default.
- W23243318 hasPublicationYear "1993" @default.
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