Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1997-06-23
1999-05-11
Schoeppel, Roger
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
702 9, E21B47/00
Patent
active
059017953
ABSTRACT:
A novel method of determining the probability that a planned drilling path will collide with an existing wellbore is disclosed. The method utilizes available uncertainty information to determine a probability for each of a plurality of segments of the planned drilling path that a projection of the segment onto a plane will intersect a projection of a corresponding segment of the existing wellbore onto the plane. The method of this invention then determines the net probability for each segment of the planned drilling path that the segment will intersect the corresponding segment of the existing wellbore by taking into account the effect of constraints imposed on each segment, by adjacent segments. The probability that the planned drilling path will intersect the existing wellbore is determined by adding together all of the net probabilities.
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"Quantative Risk Assessment of Subsurface Well Collisions," J.L. Thorogood, F.G. Tourney, F.K. Crawley, and G. Woo, SPE 20908, (pp 265-272) Oct. 1990.
"Application of Risk Analysis Methods to Subsurface Well Collisions," J.L. Thorogood, T.W. Hogg, and H.S. Williamson SPE Drilling Engineering, (pp 299-304) Dec. 1991.
Dawson Charles R.
Tsao Yuh-Hwang
Ure David W.
Exxon Production Research Company
Lyles Marcy M.
Schoeppel Roger
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