METHOD FOR CONSTRUCTION OF WELL FOR MULTIBED OIL DEPOSIT Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of well for project depth, lowering of operation column and cementation of operation column. Further drilling is performed by means of chisel of lesser diameter. Tubing string with tail piece made of glass-fiber plastics is lowered. Lower section of tail piece made of glass-fiber plastics is mounted for 2-3 meters lower than oil-saturated bed. Well shaft above the tail made of glass-fiber plastics is filled with oil or solution preventing swelling of argillaceous rocks. Inside tubing string and the tail made of glass-fiber plastics flexible metallic pipe is lowered to well face, containing a portion of backfill substance necessary for mounting of impenetrable bridge within interval from the face up to depth of 2-3 meters below the tail made of glass-fiber plastics. Backfilling of watered ranges is performed by feeding a portion of backfill substance from flexible metallic pipe. Flexible metallic pipe is raised from the well with adding of water into tubing string. On rods column a pump is lowered into tubing string. In case of presence of higher watered ranges they are isolated by profiled covers.

EFFECT: preservation of collector properties of productive bed.

2 cl, 1 ex