Method and apparatus to complete horizontal drain holes

Mining or in situ disintegration of hard material – In situ conversion of solid to fluid – Dissolving or chemical reaction

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166 50, 1661175, 166285, 175 61, E21B 4328

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active

044025513

ABSTRACT:
A method and the necessary equipment to form horizontal cased and perforated drainholes for an underground, in situ leach mining operation. After a vertical hole has been formed and cased in the earth, horizontal drainholes are to be drilled from below its casing. The depth and thickness of the ore body which is to be recovered is determined. Following this, the proper whipstock orientation is computed and the horizontal drainhole is whipstocked and drilled from above the ore bed into it. A flexible casing, such as Coflexip pipe, is used to case the drainholes. Perforations or slots are provided for in these casings before they are put in the earth. A special retrievable cement plug, basket, and one-way valve are used to control and direct the flow of cement to the volume between the outside of the juncture at the casings.

REFERENCES:
patent: 2452920 (1948-11-01), Gilbert
patent: 2492795 (1949-12-01), Goble et al.
patent: 2726847 (1955-12-01), McCune et al.
patent: 2804926 (1957-09-01), Zublin
patent: 2858107 (1958-10-01), Colmerauer
Holbert "Technical Considerations in Drainhole Drilling" ASME Publication 81-PET-14, Jan. 1981.
Maurer Engineering Inc. "Evaluation of Branch and Horizontal Boreholes for in situ Leach Mining" Jul. 1980, Pub. Jan. 1981, Coflexip Pipe Brochure.

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