Method and system for exploring for and extraction of raw...

E - Fixed Constructions – 21 – B

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E21B 43/29 (2006.01) E21B 7/00 (2006.01) E21B 7/04 (2006.01) E21B 7/20 (2006.01) E21B 7/28 (2006.01) E21B 21/12 (2006.01)

Patent

CA 2175705

Method and system for exploring for and extraction of raw materials, minerals or the like in soft ground in not readily accessible or impassable areas. Use is made of a guided horizontal drilling technique for reaching a place where there are deposits. During the drilling a hollow guide drill rod (20) with an open front end is pressed axially into the ground. In another embodiment coaxially around the guide drill rod a hollow wash drill rod (22) with an open front end is pressed into the ground. During the drilling a fluid flow is established through the guide drill rod (20) and in the opposite direction along the outer surface of the guide drill rod (20). The drilling path is used to introduce exploration means (34, 36, 38; 40, 42) and extraction means (52, 56) into the ground.

Procédé et système de recherche et d'extraction de matières premières, de minerais ou analogue dans un sol meuble situé dans une zone impraticable ou difficile d'accès. Dans le but d'atteindre un gisement, on utilise une technique de forage horizontal guidé. Pendant le forage, on enfonce axialement dans la terre une tige creuse de guidage (20) dont l'extrémité antérieure est ouverte. Selon une variante de réalisation, on enfonce dans la terre une tige creuse de lavage (22) placée de manière coaxiale autour de la tige de guidage et dotée d'une extrémité antérieure ouverte. Pendant le forage, on met un fluide en écoulement à l'intérieur de la tige de guidage (20) et dans le sens contraire sur la face extérieure de la tige de guidage (20). Le trou de forage est utilisé pour introduire dans la terre des dispositifs d'exploration (34, 36, 38; 40, 42) et d'extraction (52, 56).

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