Continental Scientific Drilling by Ulrich Harms, Christian Koeberl, Mark D. Zoback

By Ulrich Harms, Christian Koeberl, Mark D. Zoback

The overseas Continental medical Drilling application (ICDP) was once confirmed in 1996 to coordinate study that contains drilling into the continental crust. After 10 years of profitable foreign and multidisciplinary drilling tasks, this quantity offers a evaluation and synthesizes the accomplishments of the previous decade of the foreign Continental clinical Drilling application and, extra importantly, defines possibilities for medical development via destiny drilling initiatives, addressing a vast diversity of disciplines within the Earth Sciences. themes coated comprise the significance of clinical drilling for: weather swap and worldwide Environments, influence constructions, the Geobiosphere, Volcanic structures, energetic Faults, Hotspot Volcanoes and massive Igneous Provinces, Convergent Plate barriers and Collision Zones, and normal assets. furthermore this publication incorporates a precis of prior initiatives and actions supported by way of the ICDP.

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Extra resources for Continental Scientific Drilling

Sample text

The project included a production research well and two nearby science observation wells. The scientific and engineering research objectives for the production research well focus on two themes: (1) the assessment of the production and geotechnical properties of gas hydrates, and (2) an assessment of the stability of continental gas hydrates to climate change. Individual production tests were designed to isolate the reservoir response and collect a comprehensive and well calibrated production data set.

Supported by ODP-based experience, new integrated exchangeable coring tools comprising a “Rapid Piston Sampler”, a “Hydraulic Percussion Sampler”, and a “Rotary-Percussion Corer”, were developed by the Russian drilling companies NEDRA and Aquatic for the Baikal Drilling Project. Hybrid Coring System. Wireline coring systems integrated in rotary drill rigs are an adequate facility combination to achieve continuous highquality coring in deep crystalline drilling. The ICDP-funded projects Long Valley and Hawaii planned to apply such systems through service industry contracts.

Hostile Environment Downhole Logging Tools. The OSG developed and purchased a basic set downhole logging instruments for in-situ geophysical measurements. The logging tool set is innovative as it combines two usually conflictive specifications: slimhole tool dimensions and hitemperature/hi-pressure tool rating. The tools are smaller than 52 mm in diameter and work under ambient conditions of 150 °C and 80 MPa. These tools are based on conventional sonde techniques for slimhole shallow logging. To achieve the high ratings special solutions had to be implemented: the magnetic susceptibility tool got a completely new designed pressure resistent teflon-like housing around the sensors or the gamma ray 26 Ulrich Harms and Rolf Emmermann detector had to deliver strong signals also at high temperatures and despite the small volume available.

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