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Preset soluble casing plugging device and application method thereof

A plug-and-preset technology, which is used in earth-moving drilling, wellbore/well components, sealing/packing, etc., can solve the problems of difficult construction, long construction period and high construction risk, and achieves cost savings and The construction period and the effect of reducing construction risks

Active Publication Date: 2017-04-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The purpose of the present invention is to solve the problem that after the existing casing sliding sleeve cementing and fracturing construction, it is necessary to run under pressure into the production tubing, which has high construction risk and high operation risk. Problems such as high cost, long construction period, and difficult construction

Method used

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  • Preset soluble casing plugging device and application method thereof
  • Preset soluble casing plugging device and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a preset soluble sleeve plug, such as figure 1 As shown, it includes a hand-losing mechanism and a setting mechanism. The hand-losing mechanism includes a fishing joint 1 and a sliding part 11. The sliding part 11 is connected to the lower end of the fishing joint 1 through threads, and a connecting rod is arranged inside the fishing joint 1 and the sliding part 11. 10. The fishing joint 1 is fixed to the upper part of the connecting rod 10 through the locking pin 2;

[0031] The setting mechanism includes a lock block shaft 12, a lock cap 13 and a lock block body 14. The lock block shaft 12 is connected to the lower part of the sliding member 11 through a slider 5, and the middle part of the connecting rod 10 is located on the lock block shaft 12. Inside, the lower part of the connecting rod 10 is connected to a lock block body 14 through a test seat pin 9, the upper part of the lock block body 14 is located outside the lock block shaft 12, and...

Embodiment 2

[0035] This embodiment is further described on the basis of Embodiment 1. A snap ring seat is also provided on the inner wall of the fishing joint 1, and a snap ring 3 is installed in the snap ring seat. The snap ring seat on the joint 1 is located above the slot of the connecting rod 10 .

[0036] Sliding piece 11 is tubular, and its bottom tube wall is provided with a plurality of through holes along the circumference, and slide block 5 is housed in the through hole, and the outer end of slide block 5 is embedded in the inner wall of lock block shaft 12, slide piece 11 and lock block shaft 12 connections.

[0037] The upper part of the connecting rod 10 is a diameter-reducing region with a larger diameter, and the sliding member 11 is located on the periphery of the upper part of the connecting rod 10 .

[0038] Positioning grooves are arranged on the outer wall of the locking block shaft 12, and a positioning ring 7 is arranged on the inner wall of the locking block body 1...

Embodiment 3

[0042] The outer wall of the plug 18 is provided with a sealing device, the sealing device includes a sealing seat ring 15, a V-shaped sealing ring 16 and a middle support ring 17, the sealing seat ring 15 is set on the outer wall of the plug 18, and the sealing seat ring 15 is set with a plurality of V-shaped sealing rings 16, intermediate support rings 17 are arranged between adjacent V-shaped sealing rings 16, and plugs 18 are made of soluble materials.

[0043] The plug 18 is made of soluble materials, which can be completed by selecting soluble materials of different materials according to actual construction needs, and the dissolution rate can be adjusted to meet the needs of the construction period. The plug 18 has a V-shaped ring sealing mechanism, which cooperates with the sealing surface of the preset work cylinder to complete the tool sealing.

[0044] In order to strengthen the stability and sealing of the overall structure, this embodiment summarizes that the bott...

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Abstract

The invention relates to a preset soluble casing plugging device and an application method thereof; the preset soluble casing plugging device comprises a release mechanism and a setting mechanism. The release mechanism comprises an upper finishing connector, a connection rod and a slider mechanism, a tool is operated via a wire and connected to a weight bar, a jar is tripped into a preset working barrel, and a plug sealing mechanism is entered into the preset working barrel to achieve plugging. Through the jar that performs jarring downward, the fishing connector shears off a set pin, the whole release mechanism moves down, a locker shaft is driven by the connection rod to start the setting mechanism, a locker is opened and locked to a preset setting connector, and tool setting is finished. The wire is lifted up, the jar performs jarring upward, the set pin is sheared off, the connection rod and the upper release mechanism separate from the setting mechanism, and releasing is finished. After drilling is finished and the soluble plug is dissolved, a production passage is opened, and normal production process begins. The preset soluble casing plugging device has the advantages that drilling operation under pressure after fracturing of a polished casing can be omitted, construction risk is lowered, operation cost is saved, and construction cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of fracturing reconstruction of oil and gas wells, and in particular relates to a preset soluble casing plug and a use method thereof, which are mainly used for drilling under pressure without pressure after casing cementing and fracturing of oil and gas wells. Background technique [0002] At present, in the multi-layer and multi-stage fracturing construction of limited and infinite casing sliding sleeves in China, after the fracturing construction is completed, it is necessary to carry out snubbing operation into 2 "Tubing for production. Currently the operation has the following disadvantages. [0003] 1. High construction risk; [0004] 2. High operating cost; [0005] 3. The operation period is long. [0006] Therefore, it is urgent to design a casing plug to avoid the risk of drilling under pressure in the later stage, save construction costs, shorten the construction period, and lay the foundation...

Claims

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Application Information

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IPC IPC(8): E21B33/12E21B23/00
CPCE21B23/00E21B33/12
Inventor 胡开斌张华光张文星郭思文
Owner PETROCHINA CO LTD
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