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1. (WO2018220408) A METHOD OF ABANDONING A ZONE OR A WELL WITH SCALE

Pub. No.:    WO/2018/220408    International Application No.:    PCT/GB2018/051524
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Tue Jun 05 01:59:59 CEST 2018
IPC: C09K 8/42
Applicants: AUBIN LIMITED
Inventors: COLLINS, Patrick Joseph
WYLIE, Lindsay Anne
Title: A METHOD OF ABANDONING A ZONE OR A WELL WITH SCALE
Abstract:
The method includes a step of introducing into the reservoir, via a well, a mixture comprising a scale inhibitor, a first scale precursor and a second scale precursor. The first and second scale precursors can react together to form scale. The first scale precursor may be an ammonium salt. The method can further comprise a step of stopping the introduction into the reservoir of the mixture and shutting in the well for 2-24 hours, and a step of introducing into the reservoir a further mixture comprising a scale inhibitor, a first and second scale precursor which can react together to form scale. The steps of stopping and resuming the introduction of mixtures may be repeated at least once. The components of the mixtures may be provided as concentrated solutions and diluted in a stream of water prior to being introduced into the reservoir. The method provides an effective way of generating a barrier to fluid flow in a reservoir. The method may be a method of abandoning an entire well in a reservoir.