Oil & Gas Drilling Glossary - IADCLexicon.org
Undrained cohesive shear strength at lowest maximum bearing area
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsUndrained cohesive shear strength at spudcan tip.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsArea ratio.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA common laboratory testing method widely used for obtaining shear strength parameters for a variety of soil types under drained or undrained condition.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA process where a spudcan is initially emplaced away from the center of an old footprint and then the spudcan is used to displace soil towards the old footprint at desired positions to widen the disturbed region. In soft to stiff clay, stomping is very effective in mitigating spudcan footprint interaction.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA suitably stored, small amount of soil for visual inspection and laboratory testing for the determination of the soil unit geological provenance, characteristics and geotechnical engineering design parameters.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsDuring preloading the hull is held with minimal draft or air gap and the preload is incrementally increased on all the legs simultaneously.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsThe magnitude of the shear stress that a disturbed soil can sustain in an undrained condition.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA technique that involves forcing a leg into position by incremental vertical reciprocation to penetrate the spudcan into the soil at the required position. Reaming is one of the mitigation methods for reducing spudcan footprint interaction.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsUnexpected sudden and rapid penetration of the spudcan through soil occurs when strong soil is over soft soil and is a major risk for the stability and equilibrium of the jackup structure.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsDuring preloading, the hull is kept at, in or close to water level, with each individual leg preloaded by sequential filling and discharge of selected preload ballast tanks.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA technique performed to perforate the stiff layer with drill holes and remove the soil as one of the mitigation methods to reduce the punch-through failure.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsA self-elevating unit with movable legs capable of raising its hull above the surface of the sea.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsThe process in which soil reduction in volume takes place by expulsion of water under long term static loads.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsThe depth of an open cavity forms above the spudcan after penetration.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsThe maximum uplift force during spudcan extraction.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards