WELL STRAINER Russian patent published in 2003 - IPC

FIELD: production of oil and gaseous products. SUBSTANCE: invention is related to well strainers intended for filtration of oil, water or gas from subhorizontal sections of well bore. Well strainer for subhorizontal section of well bore has form of slits and is located beneath packer on casing string, has spring centralizers on each sleeve joint, slits have width from 0.1 to 0.3 mm and length 100.0-150.0 mm, are made by plasma cutting and are located along arc of circumference in rows over length of pipe equal to 0.45-0.55 length of opened productive part. Slits can be arranged in ring rows, six slits in row, with displacement of rows one relative another by 30 deg with provision for section area of filtration part per length unit of pipe equal to 900.0-1050.0 sq.mm/m or slits can be arranged in rows with location of 10-12 slits per running meter of pipe with provision for summary area of their sections equal to 17000-19000 sq.mm. EFFECT: enhanced operational efficiency, increased adaptability to manufacture and functional reliability of well strainer. 2 cl, 1 dwg