Devices, Systems and Methods for Low Frequency Seismic Borehole Investigations
First Claim
1. A seismic source device for transmitting a seismic signal into a formation surrounding a borehole, comprising:
- a. a drill-string tubular;
b. at least two force generating members retractably connected to the tubular at substantially the same axial position; and
c. a control system for activating the at least two force generating members to engage a borehole wall and transmit the seismic signal into the formation.
1 Assignment
0 Petitions
Accused Products
Abstract
Downhole seismic sources that may be compatible measurement-while-drilling systems. The downhole seismic sources are integrated into drill string components, including drill collars of the bottom hole assembly. The downhole seismic sources may generate a low swept frequency signal suitable for imaging around the drill-string and ahead of the drill bit. Integrated downhole seismic systems including a downhole seismic source, receivers and optionally data processing capabilities. The integrated systems may be configured to determine the distance and orientation of bed boundaries, including ahead of the drill bit up to about 200 m to 500 m in depth. Methods for downhole seismic, including single well and cross-well seismic. The methods may include obtaining seismic information ahead of the drill bit.
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Citations
23 Claims
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1. A seismic source device for transmitting a seismic signal into a formation surrounding a borehole, comprising:
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a. a drill-string tubular; b. at least two force generating members retractably connected to the tubular at substantially the same axial position; and c. a control system for activating the at least two force generating members to engage a borehole wall and transmit the seismic signal into the formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 23)
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17. A method for borehole seismic investigation, comprising:
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a. lowering a drill string comprising a bottom hole assembly (BHA) into a borehole, wherein the BHA comprises a seismic source integrated with a first tubular, and the seismic source comprises at least two force generating members retractably connected to the first tubular, b. activating the seismic source to transmit a low frequency seismic signal into a formation surrounding the borehole; and c. acquiring seismic data at a receiver sub comprising at least two receivers, which receiver sub is integrated with a second tubular; wherein the seismic source and the receiver sub can be deployed in the same well or in different wells. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification