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Liner Drilling Method With Dissolving Bit Drive Mechanism

IP.com Disclosure Number: IPCOM000239472D
Publication Date: 2014-Nov-10
Document File: 1 page(s) / 6K

Publishing Venue

The IP.com Prior Art Database

Abstract

A liner drilling system that contains a bit driving mechanism at the end of the liner. The drive mechanism provides power and rotation to a bit mounted at the lower end of the liner. The drive mechanism is made e.g. of a PDM motor type, but the parts of the motor are made from material that can be dissolved when the liner has been drilled in. The concept can also be combined with a bent in the lower end of the liner enabling directional liner drilling. –The related MWD technology for this purpose is either mounted in the liner or in a retrievable MWD.

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Title:

Liner Drilling Method With Dissolving Bit Drive Mechanism

Abstract:

A liner drilling system that contains a bit driving mechanism at the end of the liner. The drive mechanism provides power and rotation to a bit mounted at the lower end of the liner. The drive mechanism is made e.g. of a PDM motor type, but the parts of the motor are made from material that can be dissolved when the liner has been drilled in.

The concept can also be combined with a bent in the lower end of the liner enabling directional liner drilling. -The related MWD technology for this purpose is either mounted in the liner or in a retrievable MWD.

Description:

In normal liner or casing drilling applications the whole liner string has to be rotated to provide power to the bit mounted at the end of the liner. Companies have previously used a liner drilling system that used a PDM motor to generate power to a bit and core bit at the bottom of the liner to provide rotation to the cutting elements without having to rotate the liner - but the motor had to be retrieved at TD to provide the full drift ID for the next section. As an alternative it is proposed to incorporate a PDM type motor inside the liner joints itself. This motor provides the necessary power to drive a bit at the end of the liner. The bit is a drillable type case bit and attached to the liner shoe via a swivel, where the bearings are housed in the liner shoe. Once section TD has been reached a fluid is pumped to dissolve the...