METHOD FOR TREATING BOTTOM-HOLE ZONE OF WELL Russian patent published in 2000 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, well is washed by solvent of asphalt-resin-paraffin depositions. Solvent is pressure-forced into bottom-hole zone of well and implosive treatment is performed. For treatment of bottom-hole zone, selected is well in area of deposit with lower bed pressure. Used in function of solvent for asphalt-resin-paraffin depositions is 3-6% solution in organic solvent of mixture of heavy pyrolysis resin and diproxamine in proportion of (9-11):1. Filling of well with solvent is carried out beginning from lower perforation holes up to well head. After that, first technological pause is made during 12-24 h. Pressure-forcing of solvent into bottom-hole zone is performed in amount 1.5-2.5 cub.m/m of perforation interval. Then, second technological pause is made during 12-24 h and solvent is replaced with plugging liquid. Thermo-implosive treatment is undertaken at implosive operation. At injectivity of well after filling it with solvent of asphalt-resin-paraffin depositions beginning from lower perforation holes up to well head, undertaken is pressure-forcing of solvent into bottom-hole zone in amount of 1.5-2.5 cub.m/m of perforation interval. Application of aforesaid method improves efficiency of treatment together with increased output from well. EFFECT: higher efficiency. 1 cl