Schlumberger Technology Corporation

Nadir M M Odeh

Philippe Enkababian

Keng Seng Chan

Hassan Chaabouni

A delayed gelling system useful in conformance control in the production of petroleum from subterranean formations, especially low permeability formations, is disclosed. The gelling system comprises a basic silica sol, an activator comprising a hydroxyl donor, and an optional syneresis inhibitor. In the disclosed method of using the gelling system, the gelling system may be pumped into formations with excessive water and/or gas production and thermally activated in the formation at downhole conditions to form a hard gel to reduce water and/or gas production.

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Abu Dhabi, United Arab Emirates

Nadir M M Odeh