METHOD FOR PREPARATION OF WELL TO CEMENTATION Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this relates to preparing oil, gas, geothermal, and special deep wells to cementation. Improved quality of preparation is achieved due to better cleaning of well at temperatures from 5- to 300 C with simultaneous simplification of its technology. According to method, injected into well as high-viscous separator is neutralized sludge of galvanic production process with density regulator. Used as weighting material is barite concentrate. Injected as loosener of clayly crust is water solution of nitric acid manganese. Injection as abrasive-flushing liquid is water solution of nitric acid manganese with addition of self-loosening slag resulted from production of ferrochrome with hematite. Abrasive-flushing liquid also removes sedimentation. EFFECT: high efficiency. 2 cl, 2 tbl