Abstract:
A walkaway VSP survey is carried out with receivers located in a borehole near the base salt. Reflection tomographic inversion of data from the walkaway VSP is used to derive a velocity model for the subsurface and may be used for imaging of sub-salt reflections.
Abstract:
A seismic and/or acoustic while drilling configuration includes a high speed telemetry arrangement; at least one seismic and/or acoustic energy sensor in communication with the high speed telemetry arrangement; at least one seismic and/or acoustic energy source capable of producing at least one seismic and/or acoustic energy signal receivable by the at least one seismic and/or acoustic energy sensor and methods.
Abstract:
A walkaway VSP survey is carried out with receivers located in a borehole under a salt overhang. Redatuming of the multicomponent data to virtual sources in the borehole followed by vector Kirchhoff migration using a simple velocity model provides an accurate image of the salt face.
Abstract:
A system for acquiring logging data comprises a controller for causing the generation of a signal in a formation surrounding a wellbore. The controller has a first clock for time-stamping a record of the generated signal. A receiver is deployed in the wellbore and is adapted for detecting the signal. A second clock comprises a double-oven surrounding a crystal oscillator. A controller is operatively coupled to the double-oven to maintain the crystal oscillator temperature substantially at the crystal oscillator turnover temperature. The second clock is synchronized with the first clock before deployment in the wellbore, and the receiver references the second clock in order to record a time-stamp associated with the detected signal.
Abstract:
Methods and apparatus are adapted for acquiring seismic data from an array of sensors deployed along a section of a deviated, including horizontal, wellbore for monitoring seismic and microseismic activity. The sensors may be permanently deployed in the wellbore.
Abstract:
An apparatus or complete machinery line assembly is provided for stitching or crimping an insulating or thermal barrier member in a metal member or members. The assembly comprises a reel or unwind stand for holding and supplying insulating or thermal barrier material, a reel feeder for receiving the barrier material from the reel and feeding or inserting it into the metal member or members, a guide box for holding a metal member or members in position during feeding or insertion operations, a stitcher or crimping machine for crimping the metal members and barrier member together and a take-off or run-out table for receiving thermal barrier shapes from the crimping operation. The unwind stand, feeder, stitcher, guide box and take-off table are positioned in a line one after the other to form a continuous production line for making a unitary thermal barrier or thermal break construction element. The stitcher or crimping machine comprises a plurality of guide stations and crimping or stitching stations arranged alternately and adjacent each other. Each guide station is made as a removable block unit having an upper and lower block. The guide block units are made for handling particular metal shapes. The crimping or stitching stations are fixed and can accommodate an unlimited number of shapes. Preferably, a first stitch station crimps one side of a metal member and a second stitch station crimps the other side of the metal member or one side of another metal member.
Abstract:
A walkaway VSP survey is carried out with receivers located in a borehole near the base salt. Reflection tomographic inversion of data from the walkaway VSP is used to derive a velocity model for the subsurface and may be used for imaging of sub-salt reflections.
Abstract:
1st order free-surface multiples recorded in VSP data or reverse VSP data are processed using a 3-C 3-D vector migration method to produce an image of the subsurface. This image produces a larger coverage than that obtained in 3-C 3-D processing of reflection data acquired in the VSP.
Abstract:
A method is described for acquiring seismic data while removing, or tripping, a drill string from a wellbore. The method comprises, conveying an autonomous seismic receiver down a fluid passage in the drill string to a predetermined location proximate a lower end of the drill string; generating signals by a seismic source near a surface location; detecting the seismic signals with at least one sensor in the seismic receiver at least one predetermined location of interest in the wellbore as the drill string is removed from the wellbore; and storing the detected seismic signals in the seismic receiver.
Abstract:
An automated sample inlet system for sequentially introducing a plurality of indium encapsulated samples into a mass spectrometer wherein the samples are placed in a micro tube and loaded into a circular carousel under a vacuum bell jar maintained at ambient temperature. The samples are systematically advanced by rotating the carousel resulting in each sample sequentially falling through a delivery tube containing an inverted ball valve into a sample vaporizing chamber within an oven. An additional pair of sapphire ball valves in communication with the glass vaporizing chamber are sequentially opened and closed in a preprogrammed manner along with the opening and closing of the thermal inverted ball valve and the indexing of the carousel such as to automatically evacuate the glass inlet system iwthin the oven, introduce a new sample and vaporize it and then inject this vapor into a mass spectrometer. Such a system is useful in running large numbers of mass spectrometer analyses of hydrocarbon liquids and the like.