METHOD OF REPEATED CEMENTING OF WELLS Russian patent published in 2003 - IPC

FIELD: oil-gas producing industry. SUBSTANCE: method includes determination of specific injectivity of insulating well, separation of wells with specific injectivity of less than 1.39 cu.m/hMPa; preparation of cement mortar by mixing of cement with water and its injection onto separated wells. Preliminarily cement mortar is divided into portions with different fractional composition of solid phase particles by its pumping into overaging vessel, process holding of it at rest in this vessel, and pumping out of if by portions successively from top down into separated wells successively beginning from portion containing particle minimal fractions. EFFECT: higher efficiency of method due to reduced labor input of repeated cementing under conditions with specific injectivity of insulating well under 1.39 cu. m/hMPa. 1 tbl, 1 ex