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1. (WO2018081210) CASING DRILLING APPARATUS AND SYSTEM

Pub. No.:    WO/2018/081210    International Application No.:    PCT/US2017/058199
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Thu Oct 26 01:59:59 CEST 2017
IPC: E21B 47/01
E21B 7/20
E21B 41/00
G01V 3/00
G01V 3/08
Applicants: NATIONAL OILWELL DHT, LP
Inventors: POE, Stephen, B.
CHIARELLO, Jose
NUNEZ, Hector
Title: CASING DRILLING APPARATUS AND SYSTEM
Abstract:
The present invention provides for casing drilling with a removable MWD tool comprising a float shoe for removably positioning the bottom of a MWD tool at and or near the drill bit inside the casing, a stabilizer attached to the top of the MWD tool for centrally positioning the MWD tool inside the casing, and a spear positioned on the stabilizer for attaching to retrieval equipment known in the art and also contemplated that after the well is drilled with casing pipe and ready for the production process, a retrieval operation may be lowered into the well to retrieve the MWD tool by attaching to the spear.