GROUTING COMPOUND FOR ISOLATION OF PERMEABLE FORMATIONS Russian patent published in 1998 - IPC

FIELD: construction of wells in oil and gas producing industry, more specifically, compounds for isolation of water permeable formations and fissures. SUBSTANCE: the offered grouting compound contains polymer, solvent and nonionic surfactant. Polymer is used in form of product of copolymerization of styrene and maleic anhydride etherified with butanol, and solvent is used in form of methanol. The compound contains the following components, wt.%: product of copolymerization of styrene and maleic anhydride etherified with butanol 5-25; nonionic surfactant 0.5-2.5; the balance, methanol. EFFECT: higher efficiency of repair and isolation jobs in water-permeable formations and fissures due to production under formation conditions of grouting material possessing high adhesion to rock to obtain stronger impermeable screen. 1 tbl