Novel prestressed centralizer for centralizing ribs

A prestressing and centralizer technology, applied in drilling equipment, wellbore/well parts, earthwork drilling and production, etc., can solve problems affecting the quality of cementing sound amplitude, improve cementing quality, reduce manufacturing costs, and eliminate hollows Effect

Inactive Publication Date: 2018-05-15
潜江市联瑞石油机械有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the fact that the centralizing ribs and the casing of the current prestressed centralizer are hollow, the hollow between the centralizing ribs and the casing cannot be filled with cement slurry during the grouting process, resulting in a partial gap between the casing and the formation. Affecting the problem of cementing sound amplitude quality, the purpose of the present invention is to disclose a new type of prestressed centralizer for centralizing tendons

Method used

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  • Novel prestressed centralizer for centralizing ribs
  • Novel prestressed centralizer for centralizing ribs

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Embodiment Construction

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0013] Such as figure 1 , 2 As shown, a new prestressed centralizer for centralizing ribs is characterized by a prestressed centralizer body 1, centralizing ribs 2, and a circular hole 3. On the prestressed centralizer body 1, five arc-shaped raised ribs 2 are equidistantly added, and three circular holes 3 with a diameter of 4 mm and a spacing of about 25 mm are punched on both sides of the arc-shaped raised ribs 2.

[0014] The working principle of a new type of prestressed centralizer with centralizing ribs of the present invention is: when the cementing slurry passes through the centralizing ribs 2 to generate a swirl effect to improve the cementing replacement efficiency, the cement slurry enters through the round hole 3 above the centralizing ribs 2 To the hollow between the centralizing rib 2 and the sleeve pipe, the inside of the central...

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Abstract

The invention relates to a novel prestressed centralizer for centralizing ribs. The novel prestressed centralizer is characterized by comprising a prestressed centralizer body, five centralizing ribsand circular holes. The five arc-shaped raised centralizing ribs are arranged on the prestressed centralizer body at equal distances, and three circular holes with the diameter of 4 mm and the spacingof about 25 mm are formed in both side surfaces of each arc-shaped raised centralizing rib. When well cementing cement slurry passes through the centralizing ribs to generate a swirling effect to improve the cementing displacement efficiency, and the cement slurry enters gaps between the centralizing ribs and sleeves through the circular holes in the centralizing ribs, so that the interiors of the centralizing ribs are filled with the cement slurry, and the gaps between the centralizing ribs and the sleeves are eliminated. In this way, the centralization degree of the sleeves is increased, and the well cementing quality is improved.

Description

technical field [0001] The invention relates to a novel prestressed centralizer for centralizing ribs. Background technique [0002] With the deepening of the exploration and development of shale gas fields and the development of drilling technology, the wellbore structure of horizontal wells has been widely used, and the horizontal well sections are getting longer and deeper, which has increased the quality of casing and cementing in well completion. difficulty. The centrality of the casing in the wellbore is the basic guarantee to ensure the cementing quality, and the casing centralizer is the fundamental guarantee for the centrality of the casing and the safety of running the casing. The centralizing ribs of the prestressed centralizer (semi-rigid centralizer) are ductile steel with a certain thickness, which can resist a certain value of pressure and force on the borehole wall. When the pressure value reaches a certain value, the centralizing ribs can pass through the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10E21B33/14
CPCE21B17/1078E21B33/14
Inventor 周福新左志斌罗艳
Owner 潜江市联瑞石油机械有限公司
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