COMPOUND FOR CHEMICAL TREATMENT OF HIGH- TEMPERATURE PRODUCING FORMATION Russian patent published in 2000 - IPC

FIELD: oil and gas producing industry, particularly, production of hydrocarbons with use of chemical substances; applicable in treatment of bottom-hole formation zones. SUBSTANCE: compound includes aqueous solution of carbamide monoperoxydrate, strong mineral acid and nonionic surfactant with the following amounts of ingredients, wt.%: carbamide monoperoxohydrate ((NH₂CONH₂•H₂O₂)) 7-20; strong acid (HCl) and nonionic surfactant 0.5-1.5; the balance, water. Compound is prepared at wellhead and supplied to interval of perforations through tubing. Solution is forced into bottom-hole zone by means of excessive pressure and held there for 12 h. As a result of reaction of ions of solution with ions of polymer- argillaceous colmatage formations, their bodies are destroyed with subsequent dispersion to finely dispersed fraction. Subsequent pumping of well by any known method allows easy removal of colmatants from bottom-hole zone. Reagents used for preparation of offered compound are distinguished by their chemical stability and availability. EFFECT: higher efficiency of treatment of bottom-hole formation zone of high- temperature formations due to reduction of time of dispersion and higher dispersity of colmatage formations of polymer-argillaceous composition with simultaneous extension of assortment of chemical substances used in treatment of well bottom-hole zones. 1 tbl, 1 ex