BINDING AGENT FOR PLUGGING SOLUTIONS Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this relates to composition of binding agents used for preparation of plugging solutions for cementation of oil and gas wells. Binding agent for plugging solutions has following components, mass%: portland cement clinker 80-87, clinoptilolite-bearing rock material 7-10, gypsum 3-10. Aforesaid rock material is subjected to thermal treatment at 200-250 C during 1-1.5 h, then it is ground to such degree that amount of residue on screen No.008 is not over 1%. Mineralogical composition of rock material is as follows, mass%: calcium carbonate 5-6, clinoptilolite 13-30, montmorillonite 10-18, opal-cristabolite 17-49, quarts - the balance. Bending strength after 2 days is up to 5.4 MPa, coefficient of sulfate-resistance 0.97. EFFECT: higher efficiency.