发明名称 HYDRAULIC OVERSHOT WITH REMOVABLE SETTING AND TESTING CORE
摘要 A hydraulic overshot apparatus designed to slide over plain end tubing and set by applying hydraulic fluid, under pressure, via a hydraulic setting port, into a center chamber which allows pressure to direct to two different piston areas. The setting piston compresses packer elements and tubing slips against the outer diameter (O.D.) of the tubing. The test piston compresses tubing test elements against the inner diameter (I.D.) of the tubing. The setting pressure is ported through the upper setting and test portion o allow pressure to move from the center chamber to the lower outer portion. The lower outer portion includes a body lock ring and a setting piston for setting the packer elements. Setting pressure moves the setting piston down through the body lock ring. As the setting piston moves down, it ratchets down through the body lock ring. The teeth on both the setting piston and body lock ring will prevent the backward movement (or upward movement) of the setting piston as it moves through the body lock ring. The downward movement of the setting piston will compress the packer elements and force the tubing slips down onto the O.D. of the tubing. The setting force is stored in the packer elements and provides reaction force needed to prevent movement of the tubing. After the apparatus has been set and tested, the setting and testing core portion is removed to allow work over operations. If tubing or work over pumping pressure is allowed to come up through the apparatus, the pressure will increase the setting pressure on the tubing slips.
申请公布号 US2009178810(A1) 申请公布日期 2009.07.16
申请号 US20080334800 申请日期 2008.12.15
申请人 CENAC MARTIN;WONG FREDRICK 发明人 CENAC MARTIN;WONG FREDRICK
分类号 E21B41/00;E21B33/12 主分类号 E21B41/00
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