Drilling method and casing shoe

Details Drilling method and casing shoe Drilling method and casing shoe

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 17/08 (2006.01) E21B 17/14 (2006.01)

Patent

CA 2228494

At drilling in earth layers and simultaneous forcing in of casing tubes it is desirable to use casing tubes of plastic material, such as PEH plastic. This is made possible through a special forming of a casing shoe which gives a firm connection between the casing shoe and the casing tube. The casing shoe comprises an outer annular part (3) and an inner annular part (8) with against each other corresponding conical sections (6, 11) between which the casing tube can be clamped.

Pour forer des couches de terrain et simultanément monter en force des tubes de forage, il est souhaitable d'utiliser des tubes de forage en matière plastique telle que le PEH. Cela est désormais possible grâce au formage spécial effectué par un sabot de cuvelage qui établit une liaison ferme entre le sabot de cuvelage et le tube de forage. Le sabot de cuvelage se compose d'une partie annulaire externe (3) et d'une partie annulaire interne (8) s'appliquant l'une contre l'autre par des sections coniques (6, 11) complémentaires entre lesquelles il est possible de pincer le tube de forage.

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