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1. (WO2018103970) METHODS AND APPARATUS FOR CREATING WELLBORES

Pub. No.:    WO/2018/103970    International Application No.:    PCT/EP2017/077984
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Thu Nov 02 00:59:59 CET 2017
IPC: E21B 43/10
E21B 43/30
Applicants: TOTAL E&P DANMARK A/S
Inventors: KOGSBOLL, Hans-Henrik
MULROONEY, Michael Dermot
Title: METHODS AND APPARATUS FOR CREATING WELLBORES
Abstract:
A method of creating a horizontal wellbore section (16)comprises drilling the section in at least two stages. The method comprises drilling a first horizontal bore section (26). The first horizontal bore section is then provided with a first liner (22) having a wall including initially-closed flow ports. The first liner isolates the wall of the first bore section. A second horizontal bore section (38) is then drilled beyond the first horizontal bore section. The second horizontal bore section is provided with a second liner (24). Stimulation fluid (44) is then directed into the first and second liners so that the stimulation fluid passes through the wall of the second liner to stimulate the second horizontal bore section. The flow ports in the wall of the first liner are then opened so that the stimulation fluid passes through the wall of the first liner to stimulate the first horizontal bore section.