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1. (WO2017069774) CASING STRING ASSEMBLY WITH COMPOSITE PRE-MILLED WINDOW

Pub. No.:    WO/2017/069774    International Application No.:    PCT/US2015/057130
Publication Date: Fri Apr 28 01:59:59 CEST 2017 International Filing Date: Sat Oct 24 01:59:59 CEST 2015
IPC: E21B 17/00
E21B 7/04
E21B 7/08
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: GOSNEY, Jon Troy
Title: CASING STRING ASSEMBLY WITH COMPOSITE PRE-MILLED WINDOW
Abstract:
Casing string assemblies with a composite pre-milled window used in oil wells, as well as methods for producing them, are disclosed. The composite pre-milled window provides mechanical protection but is easily drillable or millable without the need to remove unwanted debris or internal sleeves, and is especially suitable for multilateral well technology.