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Starting pup joint with second-time opening function

A secondary opening and functional technology, applied in the direction of mining fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of accident economy, difficulty in fracturing operations, loss, etc., achieve high-strength sealing and prevent leakage Effect

Pending Publication Date: 2019-08-02
JEREH ENERGY SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there are many impurities in the bottom hole fluid and the differential pressure sliding sleeve is blocked and cannot be opened normally, subsequent fracturing operations will be difficult to carry out, causing accidents and economic losses

Method used

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  • Starting pup joint with second-time opening function

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Embodiment Construction

[0026] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so it only shows the composition related to the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or an intervening element may also exist. When a component is said to be "connected" to another component, it may be directly connected to the other component or intervening components may also be present. As used herein, the terms "upper", "lower", "inner", "outer", "left", "right" and similar expressions are for the purpose of illustration only and do not represent the only embodiment.

[0028] Such as figure 1 As shown, a starting short circuit with a secondary opening function includes: a mandrel 4, t...

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Abstract

The invention discloses a starting pup joint with a second-time starting function. The starting pup joint comprises a core shaft and a setting ball. The core shaft is connected with a sliding sleeve,the setting ball is connected with the core shaft, the sliding sleeve is connected with an outer sleeve, the outer sleeve is connected with the core shaft through a first-stage shear pin, a groove isformed in the core shaft, a baffle ring can be embedded into the groove, the baffle ring is in contact with the outer sleeve, the sliding sleeve is connected with an upper joint, the upper joint is connected with a lower joint, the upper joint, the sliding sleeve and the core shaft are sequentially connected in a step mode, the core shaft is provided with a fluid channel and a fracturing channel,and the sliding sleeve is provided with a fluid channel and a fracturing channel. Setting of a packer can be achieved when the packer is opened for the first time, and when the differential pressure sliding sleeve cannot be opened normally, the starting pup joint is started for the second time, and the fracturing channel is opened.

Description

technical field [0001] The invention relates to the field of open-hole well completion and staged fracturing technology for oil and gas development, in particular to a start-up short circuit with a secondary opening function. Background technique [0002] In the well completion staged fracturing tool string, the packer is a commonly used downhole tool, which separates different fluid layers in the wellbore. In the setting method of the packer, the starting short is a commonly used and reliable setting tool. The start-up short is located between the differential pressure sliding sleeve and the floating hoop in the tool string, and is pressed into the pipe string by throwing a ball. Under a certain pressure, the short-circuit is started to achieve sealing, so that the packer is set. [0003] At present, the start-up short commonly used in the completion tool string can only be opened once, and the start-up short fluid channel is closed. When there are many impurities in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/06E21B43/26
CPCE21B23/06E21B43/26
Inventor 李文清韩滔于智慧
Owner JEREH ENERGY SERVICES
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