COMPOUND FOR OPENING PRODUCING FORMATION AND METHOD FOR TREATMENT WELL WITH THIS COMPOUND Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: compound for opening producing formation contains, mas. calcium chloride 15-22; pyrophosphoric acid 13.2-20.2; surfactant 0.5-1.5; the balance, water. Process solution of compound is injected into well zone in volume of 1.4-1.6 of pore volume of treated zone, then, at constant pressure, injected into well is fluid in volume of 0.2-0.4 of volume of process solution, and after its injection, the fluid is withdrawn in same volume. Well treatment is finished at stabilization of injected material flow rate. Fluid injected and withdrawn after process solution is used in form of same process solution or water. EFFECT: increased permeability of zone of formation round well due to removal of organomineral mud fill and higher accuracy of control of treatment process with combination of control operations with technological operations. 7 tbl