A combined self-locking variable-diameter rubber plug

A self-locking, rubber plug technology, used in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problems of casing sealing performance and anti-wear performance not being guaranteed, affecting later operations, etc. , to meet the requirements of reducing diameter, improve compression performance and anti-wear performance

Active Publication Date: 2017-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution only solves a part of the problem, and the optimization of the compound formula is limited. If the inner diameter of the casing changes too much, the compound needs to be very soft to meet the requirements for passing through the small diameter. The sealing performance and anti-wear performance in the pipe cannot be guaranteed, and once the cement plug is left, it will affect the later work

Method used

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  • A combined self-locking variable-diameter rubber plug
  • A combined self-locking variable-diameter rubber plug
  • A combined self-locking variable-diameter rubber plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the present invention provides a combined self-locking variable-diameter rubber plug, including a lower rubber plug 17, the front end of the lower rubber plug 17 is connected with a self-locking head 11, and the rear end is connected with a glue upper end through a shear pin 8 Plug 19, the tail of the upper rubber plug 19 is provided with a tapered opening 2, and the tapered opening 2 is provided with a pressure-bearing elastic element 1 for isolating the inner cavity of the lower rubber plug 17 from the external liquid. The lower rubber plug 17 The outer diameter is less than the outer diameter of the rubber plug 19.

[0022] Such as figure 2 As shown, the combined self-locking variable-diameter rubber plug moves to the conversion position between the large casing 13 and the small casing 14, the upper rubber plug 19 is located in the large casing 13, the lower rubber plug 17 is located in the small casing 14, and the glue The pressure-bear...

Embodiment 2

[0027] On the basis of Example 1, further, the upper rubber plug 19 includes a first mandrel 6 and a rubber bowl sleeved on the outer wall of the first mandrel 6, and the rubber bowl is composed of the first rubber bowl 7 and the second rubber bowl. The first plastic bowl 7 has a diameter of 188 mm to 196 mm, and the second plastic bowl 5 has a diameter of 160 mm to 170 mm.

[0028] The diameter of the first rubber bowl 7 is larger than the maximum inner diameter of the large casing 13, which meets the requirements of cement scraping, and the first rubber bowl 7 is evenly spaced on the first mandrel 6, and the second rubber bowl 5 is similar to the first rubber bowl. The bowls 7 are evenly sleeved on the first mandrel 6 at equal intervals, and the first rubber bowl 7 is arranged near the end where the upper rubber plug 19 and the lower rubber plug 17 are connected.

Embodiment 3

[0030] On the basis of Embodiment 2, in particular, the outer wall of the first mandrel 6 is also sleeved with a joint cap 3 for fixing the rubber bowl at the end close to the tail of the upper rubber plug 19, and the joint between the cap 3 and the rubber bowl There is a top cap 4 sleeved on the first mandrel 6 for fixing the rubber bowl.

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Abstract

The invention provides a combined self-locking reducing rubber plug. The combined self-locking reducing rubber plug comprises a lower rubber plug, wherein the front end of the lower rubber plug is connected with a self-locking head; the rear end of the lower rubber plug is connected with an upper rubber plug through shear pins; a conical opening is formed in the tail part of the upper rubber plug; a pressure-bearing elastic element used for isolating the inner cavity of the lower rubber plug from external liquid is arranged in the conical opening; the outer diameter of the lower rubber plug is smaller than that of the upper rubber plug. According to the combined self-locking reducing rubber plug provided by the invention, the defect that the performance of the rubber plug is improved only by adjusting a rubber material formula is overcome, the rubber plugs with different diameters are connected through the shear pins, the combined self-locking reducing rubber plug can be simultaneously applied to a big casing pipe and a small casing pipe, the requirement on well cementation under an ultra-high reducing condition of a combined casing pipe is met, the compressibility and the abrasion resistance of the rubber plugs are improved, and the casing pipe reducing requirement is met.

Description

technical field [0001] The invention belongs to the technical field of petroleum cementing engineering, and in particular relates to a combined self-locking variable-diameter rubber plug. Background technique [0002] At present, the existing rubber plugs mainly meet the requirements of cement scraping and cementing with equal casing inner diameters. However, with the continuous advancement of the development of low-permeability oil and gas resources, the cementing and completion process is often combined with later downhole operations. And due to various considerations, casing strings are becoming more and more complex, such as composite casings, casing strings plus casing sliding sleeves, etc., where large variable diameters exist in casings. The use of conventional rubber plugs can only meet the requirements of equal-diameter scraping, but cannot meet the requirements of cement scraping under variable-diameter conditions. [0003] In response to the above situation, engi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/134
CPCE21B33/134
Inventor 黄占盈段志锋周文军吴学升欧阳勇余世福王彦博徐自强
Owner PETROCHINA CO LTD
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