COMPLEX REAGENT FOR GROUTING MORTAR AND GROUTING MORTAR Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly for grouting mortar preparation during oil and gas well casing.

SUBSTANCE: complex reagent includes fluid loss reducing agent, plasticizer and antifoaming agent. The reagent additionally has structure-forming agent. All above components are taken in the following amounts (% by weight): fluid loss reducing agent - 30-94, plasticizer - 2-25, antifoaming agent - 1-14, structure-forming agent - 3-25. Structure-forming agent comprises at least one aluminum compound selected from the group including hydroxychloride, tetrahydroxychloride, pentahydroxychloride or amorphous aluminum oxide. Grouting mortar includes cement and above complex reagent added to cement in amount of 0.6-1.5% of dry cement weight. For grouting mortar production light-weight cement with lightweight additive is used. Lightweight additive is clay, diatomite, vermiculite, pearlite or microspheres. The cement is Portland cement with additives or without additives, expandable cement or gypsum cement.

EFFECT: reduced water losses, increased sedimentary stability, hardened grouting mortar uniformity over the full column dimension, possibility to use grouting mortar with normal density, as well as light and superlight grouting mortar.

4 cl, 3 ex, 1 tbl