METHOD FOR SECONDARY OPENING OF PRODUCTIVE BED Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, installed in well is filter with holes. Inserted into each hole of filter is hollow sleeve. Located in sleeve space are double-side seating cradle, limiting grates, and locking member. Locking member is made in the form of ball manufactured from resiliently deformable material. All this components represent reversible non-return valve. Filter holes are successively opened. After opening of each filter hole, undertaken is analysis of fluid which enters this hole. Then, filter holes are closed. Well is brought in operation by perforation of non-flooded section. This prevents activation of flooded bed or flooded section for horizontal bottom-hole of well. EFFECT: higher efficiency. 4 dwg