Methods and apparatus having borehole seismic waveform compression

A waveform and digital waveform technology, applied in the field of downhole seismic waveform compression and devices

Inactive Publication Date: 2014-08-13
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bandwidth limitations of such systems make it impossible to communicate all collected waveforms to the surfa...

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  • Methods and apparatus having borehole seismic waveform compression
  • Methods and apparatus having borehole seismic waveform compression
  • Methods and apparatus having borehole seismic waveform compression

Examples

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Embodiment Construction

[0023] figure 1 An exemplary seismic while drilling (SWD) environment is shown. The drilling platform 2 is equipped with a derrick 4 supporting an elevator 6 for raising and lowering a drill string 8 . The hoist 6 suspends a top drive 10 adapted to rotate and lower the drill string 8 through the wellhead 12 . Attached to the lower end of the drill string 8 is a drill bit 14 . As the drill bit 14 rotates, the drill bit 14 creates a borehole 16 that penetrates various formations 18 . Pump 20 circulates drilling fluid through supply pipe 22 to top drive 10 , down through the interior of drill string 8 , through the bore of drill bit 14 , back to the surface via the annulus surrounding drill string 8 , and into retention pit 24 . The drilling fluid transports cuttings from the borehole into the pit 24 and helps maintain the integrity of the borehole 16 .

[0024] The logging tool suite 26 is integrated into a bottom-hole assembly near the drill bit 14 . As drill bit 14 extend...

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Abstract

An illustrative seismic while drilling system includes a drill string having at least one seismic sensor that can be employed to detect seismic signals during pauses in the drilling process, e.g., when extending the length of the drill string. An embedded processor digitizes a signal from the seismic sensor to obtain a digital waveform and processes the digital waveform to derive a compressed waveform representation for storage or transmission. Compression is provided by adaptively reducing the sampling rate and quantization resolution subject to one or more quality constraints including, e.g., error in first break timing, error in first break sign, mean square error, and bit count. Reasonably good representations of the received acoustic waveforms can be achieve with less than 200 bits.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 61 / 543,616, filed October 5, 2011, entitled "Methods and Apparatus Having Borehole Seismic Waveform Compression" . This application is hereby incorporated by reference. technical field Background technique [0003] Current developments in logging / measurement while drilling have enabled the development of new seismic tools that acquire and transmit seismic data in real time during drilling without disrupting rig operations. Such seismic while drilling (SWD) techniques can significantly (beneficially) impact the cost of exploration and development drilling, especially in deepwater environments and other zones with significant seismic uncertainty. The primary application of SWD is to properly locate a well in a seismic profile so that the driller can steer the well toward the target. SWD can also assist drillers with other drilling decisions, i...

Claims

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Application Information

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IPC IPC(8): G01V1/22
CPCH03M7/3059G01V1/48G06F5/00E21B47/12G01V2200/16G01V11/002H03M7/30E21B47/16
Inventor V·斯托尔普曼
Owner HALLIBURTON ENERGY SERVICES INC
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