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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

Active Publication Date: 2012-05-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the tubing is used to send it into the seat seal or fish, the efficiency is low and it is not suitable for deep well operations, and the wellhead sealing is difficult; the bridge plug cannot pass through the bottom of the tubing with small diameter downhole tools (packers or eccentric water distributors, etc.) ) to plug the tubing

Method used

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  • A bridge plug that blocks off oil tube
  • A bridge plug that blocks off oil tube
  • A bridge plug that blocks off oil tube

Examples

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Effect test

Embodiment 1

[0025] Embodiment 1: Taking a plugging oil pipe bridge plug with an inner diameter of φ62mm as an example, the present invention will be further described in detail. According to this inner diameter value, the size of the bridge plug body is selected to be φ56mm.

[0026] The bridge plug for sealing the oil pipe of the present invention is composed of a salvage part, an upper clamp part, a sealing part and a lower clamp part from top to bottom.

[0027] refer to figure 1. The fishing part includes a fishing head 1, a central rod 2, a jar connecting sleeve 3, a sliding nail 4, and an unlocking sleeve 5. Fishing head 1 is a cone shape, and the center of the lower end of fishing head 1 has an internal thread. The central rod 2 is cylindrical, the maximum outer diameter of the central rod 2 is 25 mm, and the length is 800 mm. The top end of the center rod 2 has an external thread. The upper part of the central rod 2 is threadedly connected with the fishing head 1. The jar co...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/134
Inventor 刘江波王效明张安康白小佩李旭梅
Owner PETROCHINA CO LTD
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