METHOD FOR ISOLATION OF ABSORPTION ZONE IN WELLS Russian patent published in 1999 - IPC

FIELD: gas production industry. SUBSTANCE: method particularly relates to isolation of absorption zone in wells for period of performing overhaul and subsurface repair and also at putting wells in operation upon drilling. According to method, injected into wells is blocking compound and pressing-down liquid. Simultaneously injected are at least two compounds which in process of mixing and pressing-down in well create Newtonian high-viscous dispersive system, for example, compound No.1 which includes following components, mas.%: sludge from production of sulfonate additives to lubricating oils or additives on its base 45-48, synthetic fatty acids 1-1.5, stable condensate 1-4, oversaturated water solution of calcium chloride with density of 1300-1460 g/cub.cm - the balance up to 100%. Compound No.2, including following components, mas.%: sodium hydroxide 5-9, sodium sulfate 3-5, carboxylmethylcellulose 0.7-1, sodium carbonate 6-9, chemically settled chalk 2-8, water - the balance up to 100%. Compound are prepared separately and injection of proportion 1:1. Application of aforesaid method improves efficiency in blocking absorption zones by raising active viscosity, structural and mechanical properties, thixotropic structure and stability of mixture being injected especially in wells with high degree of cavernous characteristic of productive reservoirs and abnormally low bed pressures. EFFECT: higher efficiency. 1 dwg, 2 tbl