Special sliding sleeve for multistage fracturing

• Main Authors: PENG ZHIGANG, XU XIN, ZOU XIAOMIN, LI GUOFENG, CAO HUILIAN, YU JINLING, WEI XINFANG, XU CHANCHAN, MIAO YONG
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2012
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model belongs to the field of well drilling tubular tools and relates to a special sliding sleeve for multistage fracturing of horizontal well open holes which is applicable to petroleum drilling and well completion. The technical scheme includes that a sliding sleeve outer barrel is in sliding fit with a sliding sleeve core in the sliding sleeve outer barrel, a shearing pin and a sealing part are arranged on the fitting surface, an upper joint and a lower joint are arranged at two ends of the sliding sleeve outer barrel, two to eight liquid outlets are evenly distributed on the wall of the sliding sleeve outer barrel, a ball seat is arranged on the upper end face of the sliding sleeve core, the ball seat of the sliding sleeve core has a chamfering conical surface, and a chamfering conical surface which is in the same conical surface with the chamfering conical surface of the ball seat is arranged below threads of the upper joint. The upper edge of the chamfering conical surface of the sliding sle