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1. (WO2017155517) RAPID SETTING IN SITU CEMENT PLUGS

Pub. No.:    WO/2017/155517    International Application No.:    PCT/US2016/021383
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Mar 09 00:59:59 CET 2016
IPC: E21B 33/12
E21B 23/06
C04B 28/14
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: JONES, Paul Joseph
RAVI, Krishna
AGAPIOU, Kyriacos
Title: RAPID SETTING IN SITU CEMENT PLUGS
Abstract:
Methods, compositions, and tools for use in creating rapidly forming plugs in situ in subterranean formations. In one instance, the disclosure provides a method that includes: placing a first pill comprising a calcium-aluminate-based cement composition at a plug location within the wellbore with the tubing; and placing a second pill comprising an alkaline fluid composition into the wellbore adjacent to the first pill with the tubing. In some cases there is a spacer fluid or spacer device between the first pill and the second pill. In some cases tubing having a mixing device is located at the bottom of the tubing in the wellbore to aid I mixing the first pill and the second pill to facilitate a chemical in situ reaction of the first pill and the second pill. The reaction between the first pill and the second pill forms a set plug at the plug location.