A bridge plug that blocks off oil tube

A bridge plug and tubing technology, applied in the field of downhole tools, can solve problems such as low efficiency and difficult wellhead sealing, and achieve the effect of reliable seat seal and large sealing pressure difference
CN101550815BActive Publication Date: 2012-05-30PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2012-05-30

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Abstract

A bridge plug that blocks off oil tube is used in underground blocking oil tube during a pressure operation in the oil, gas or water well in an oilfield. From top to bottom, the bridge plug consists of salvage part, slip setting part, sealing part and slip release part. Steel wire is used for seat delivery, salvage and unsealing. The slip release part may accurately determine the position of the bridge plug. In both sealing part and slip setting part, self-locking devices are provided to realize reliable sealing. During salvage, a special tool is used to cooperate with the salvage part and unseal and take out the bridge plug. After replacement of packing elements and shear pins and simple maintenance, this bridge plug may be used repeatedly. The bridge plug adopts a double-slip structure and realizes the function of blocking off oil tube by using mechanical vibration and self-locking principle. It has the following advantages: sealing in any position, large sealing pressure difference,salvage, blocking of the oil tubes with a very small aperture, and blocking by section.
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Description

technical field

[0001] The invention relates to downhole tools for oil, gas and water wells in oil fields, in particular to a downhole special tool for plugging oil pipes, which is a bridge plug for plugging oil pipes. Background technique

[0002] In oil, gas, and water wells in the oil field, when carrying out snubbing operations and replacing the main valve of the wellhead, in order to reduce pollution to the production layer, improve construction efficiency, and reduce investment in ground equipment, special tubing plugging tools are usually used to plug the inside of the tubing. cavity and remove it when the job is complete. The bridge plug involved in this patent is a special oil pipe plugging tool, which is sealed by steel wire delivery, and the plugging is accurate and reliable; when salvaging, the bridge plug is unsealed and taken out with supporting tools, and can be reused after simple maintenance and replacement of parts .

[0003] The hydraulic delivery type t...

Claims

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