Expansion cone

A technology of expansion cone and expansion tube, applied in the field of expansion cone, can solve problems such as built-up edge, achieve the effect of improving lubrication conditions, avoiding stress concentration on the cone surface, and reducing expansion pressure

Active Publication Date: 2014-05-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problem that the expansion cone in the prior art is prone to produce built-up edge

Method used

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  • Expansion cone
  • Expansion cone
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Embodiment Construction

[0026] The expansion cone of the present invention will be described in further detail below in conjunction with the accompanying drawings. An expansion cone, the expansion cone is cylindrical, including the first section of the cone 1, the second section of the cone 2 and the third section of the cone 3 connected in sequence along the axis of the expansion cone, the expansion cone is provided with The through hole 4 penetrating in the axial direction, the outer diameter of the first section of the cone 1 is smaller than the outer diameter of the third section of the cone 3, and the part of the surface of the second section of the cone 2 adjacent to the first section of the cone 1 is elliptical Part of the surface of a sphere, such as figure 1 As shown, that is, the surface shape of the right section A of the second section cone 2 is a part of the surface of an elliptical sphere, such as figure 1 Middle right section A and figure 2 The right segment A indicated by the solid...

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Abstract

The invention provides an expansion cone comprising a first cone section (1), a second cone section (2) and a third cone section (3). The first, second and third section cones (1, 2 and 3) are sequentially connected along the axis of the expansion cone. A through hole (4) penetrating along the axial direction is arranged inside the expansion cone, the outer diameter of the first cone section (1) is smaller than that of the third cone section (3), and part of the surface, adjacent to the first cone section (1), of the second cone section (2) is part of the surface of an elliptical ball. Friction resistance of the expansion cone during the expansion process can be beneficially lowered, strength of the expansion cone can be enhanced, elasticity of the expansion cone can be guaranteed, and occurrences of unexpected accidents like cracking and too much abrasion caused by long-distance expansion construction can be avoided.

Description

technical field [0001] The invention relates to the field of oil extraction equipment, in particular to an expansion cone used in an expansion pipe. Background technique [0002] Expandable pipe technology is a new technology that has been booming in recent years, and it can be applied to drilling, well completion, oil production, workover and other operations. The expansion tube subsidy technology is very mature at present, and expansion tube completion has become a relatively popular completion scheme recently. The expansion tube used as the completion casing is long in length, and the expansion operation is difficult, and the performance requirements of the expansion cone are higher. For example, Wear resistance, high strength, impact resistance, reliability, etc., not only must have sufficient elasticity to ensure the reliability of the impact resistance of the expanding cone, but also must have sufficient rigidity and wear resistance to ensure the completion of long-dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10
Inventor 李益良李涛孙强韩伟业陈强明尔扬毕秀玲薛建军丁爱芹
Owner PETROCHINA CO LTD
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