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External casing packer

A packer and casing technology, applied in cementing or logging, oil and gas drilling, and well completion, can solve problems such as reduced elastic properties, tearing, and no anti-skid structure

Active Publication Date: 2020-10-20
DONGYING XIN HUALIAN PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current self-expanding casing outer packer has the following problems: After the rubber expands, its elastic properties are greatly reduced, and its deformation resistance is reduced, which may easily lead to rubber extrusion and tearing during the sealing process, seriously affecting its sealing performance
[0010] In addition, most of the existing rubber cartridges are made of rubber with a smooth outer surface. Since the rubber material is soft and there is no anti-skid structure on the outer surface of the rubber cartridge, the packer is easy to slide
In order to ensure a stable seat seal, the existing method is to increase the pressure to make the rubber tube expand even more, so as to increase the friction with the inner wall of the wellbore, but the rubber tube is more likely to burst after swelling

Method used

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specific Embodiment approach

[0072]It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention Any modification of structure, change of proportional relationship or adjustment of size shall fall within the range covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. within range.

[0073] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without ...

Embodiment 1

[0075] combined with Figure 1-4 , a casing outer packer, including a central tube 1, a rubber tube 2 and a rubber tube fixing ring 3, the rubber tube 2 is sleeved outside the center tube 1, and the rubber tube fixing ring 3 is fixed on The central tube 1 is fixedly connected to both ends of the rubber tube 2, and there is an annular space 5 between the rubber tube 2 and the central tube 1. The inner cylinder 21 made of elastic material and the outer cylinder 22 made of elastic material that expands in case of liquid, the rubber cylinder fixing ring 3 is provided with a first flow channel 34 leading to the annular space 5, the first flow channel The entrance of the channel 34 is provided with a sealing valve core 35, the inner cylinder 21 includes an inner cylinder 211, and the axial center of the inner cylinder 211 is provided with a radial through hole 212, and the through hole 212 faces the One end of the central tube 1 is provided with a fracturable sealing film 213 , and...

Embodiment 2

[0084] This embodiment is a modified example of the rubber cartridge 2 in the outer casing packer of Embodiment 1. Since traditional self-expanding materials need to make a trade-off between physical and mechanical properties and self-expansion performance, higher self-expansion is desired Performance requires the introduction of more hydrophilic groups, and the more hydrophilic groups introduced, the lower its physical and mechanical properties, and the reduction of physical and mechanical properties will make the rubber tube more prone to tearing during deformation Crack or break, that is, in order to make full use of the expansion properties of the self-expanding material, its elastic physical and mechanical properties will inevitably be greatly weakened, making it easy to burst or fragment and lose the sealing effect. Therefore, this embodiment proposes another technical solution , that is, the expansion performance of the outer cylinder 221 can be fully utilized without af...

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Abstract

The invention relates to the technical field of oil and gas drilling, well completion, well cementation or well logging, in particular to an external casing packer. The external casing packer comprises a center pipe, a rubber sleeve and a rubber sleeve fixing ring, the rubber sleeve is arranged outside the center pipe in a sleeving mode, the rubber sleeve fixing ring is fixed to the center pipe and fixedly connected with the two ends of the rubber sleeve, and an annular space is reserved between the rubber sleeve and the center pipe. The rubber sleeve comprises an inner sleeve made of an elastic material which does not expand when encountering liquid and an outer sleeve made of an elastic material which expands when encountering oil, a first flow channel leading to the annular space is formed in the rubber sleeve fixing ring, and a sealing valve element is arranged at an inlet of the first flow channel; and the inner sleeve comprises an inner sleeve body, a radial through hole is formed in the axial center of the inner sleeve body, a fracturing sealing film is arranged at the end, facing the center pipe, of the through hole, and a finger-shaped reed is arranged at the joint of therubber sleeve and the rubber sleeve fixing ring in a surrounding mode. The external casing packer can prevent the rubber sleeve from bursting, tearing and extruding, and the packing effect is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, well completion, well cementing or well logging, and in particular to a casing outer packer. Background technique [0002] A packer refers to a downhole tool that has elastic sealing elements to seal off the annular space between pipe strings of various sizes and wellbore and between pipe strings, and isolate the production layer to control the production and injection of fluid to protect the casing. According to the specific isolation position, it can be divided into many types. Among them, the outer casing packer is used to isolate the annular space between the casing and the wellbore. The outer casing packer can effectively seal off the oil, gas and water layers, carry out selective exploitation or seal a certain interval, and ensure the sealing of the annular space outside the casing. At present, outer casing packers are widely used in oil and gas well cementing or well completi...

Claims

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Application Information

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IPC IPC(8): B29C48/305B29C48/08B29C48/21B29C48/30E21B33/127
CPCB29C48/023B29C48/08B29C48/21B29C48/3001B29C48/307E21B33/1277
Inventor 李振华葛磊张天保李敬冀延民李佃波李妍慧
Owner DONGYING XIN HUALIAN PETROLEUM MACHINERY
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