Method and system for vertical seismic profiling by measuring drilling vibrations
Patent
·
OSTI ID:5809148
This patent describes a method for obtaining seismic data pertaining to an earth formation while forming a wellbore in the formation with a drillstring having a drillbit or the like disposed at the lower distal end thereof. It comprises: providing vibration sensing means connected to an upper region of the drillstring. The vibration sensing means being adapted to produce electrical signals related to vibrations of the drillstring; providing an array of seismometers disposed generally on the earth's surface in the vicinity of the wellbore; measuring first signals generated by the vibration sensing means resulting from vibrations of the drillstring; measuring second signals generated by the array of seismometers resulting from vibrations transmitted through the formation; and comparing the first signals and the second signals to determine selected characteristics of the formation including the step of calculating the location of origin of the first signal based on the difference in time of arrival at the vibration sensing means of a torsional vibration signal and an axial vibration signal transmitted through the drillstring and at least one of the torsional wave speed and the axial wave speed in the drillstring to determine the origin in time of the first signal.
- Assignee:
- Atlantic Richfield Co., Los Angeles, CA (USA)
- Patent Number(s):
- US 4965774; A
- Application Number:
- PPN: US 7-385621
- OSTI ID:
- 5809148
- Country of Publication:
- United States
- Language:
- English
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