Title: Drilling technique for providing multiple-pass penetration of a mineral-bearing formation

Abstract: This specification discloses a technique of providing a wellbore that is extended along a track from the surface of the earth and penetrates and passes through a subsurface mineral-bearing formation a plurality of times. The wellbore is initially extended from the surface of the earth into the earth's crust in essentially a vertical direction and then is deviated toward the horizontal and extended to pass through the subsurface mineral-bearing formation from top to bottom at an oblique angle. The wellbore is then further deviated and extended along a track in an upwardly direction such that it again penetrates and passes through the subsurface mineral-bearing formation, this time from bottom to top. The wellbore may then again be deviated and extended along a downward track to again penetrate the formation from the top.

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Inventors: Dellinger, Thomas B. (Duncanville, TX)

Application Number: 06/315394
Filing Date: 1981-10-27
Publication_date: 1983-06-07
Assignee: MOBIL OIL CORP

Primary Class(es): 175/61 166/50
Other Classes: E21B7/04; E21B43/30; E21B43/00; E21B7/06
US Patent Ref:

2280851	April, 1942	Ranney	175/61
2404341	July, 1946	Zublin	175/61
2565794	August, 1961	Young	175/61
3986557	October, 1976	Striegler	166/272

Other Refs:
Primary Examiner: Pate III, William F.
Assistant Examiner:
Attorney: Huggett C. A.
Gilman M. G.
Powers Jr., J. F.

Parent Case Data: CROSS-REFERENCE TO RELATED APPLICATIO