Oil tube centralizer

A technology of centralizer and oil pipe, applied in drilling pipe, casing, drilling equipment and other directions, can solve the problems of increasing workover costs of oil and water wells, workload of large workover operations, and difficulty in removing jams, etc., and achieves significant economic benefits, The effect of reducing the cost of well workover and the difficulty of unblocking work

Active Publication Date: 2018-07-27
山东博诺利石油装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the centralizing piece of this tubing centralizer is perpendicular to the axis of the tubing (can be in the same plane), such as figure 1 As shown, the outer diameter of the circle formed by the outer edges of several centralizing pieces is larger than the inner diameter of the casing milling barrel. Whe

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Example Embodiment

[0009] Attached below figure 2 , 3 The embodiments of the present invention are further described:

[0010] by figure 2 , 3 It can be seen that the embodiment of the present invention includes a centralizer 1 and an inner tube 2. The centralizer 1 is installed on the inner tube 2 (welded), the number of the centralizer 1 is 3-8, and the two ends of the centralizer 1 are chamfered. The axis of the centralizer 1 and the inner tube 2 is at an angle of 20-70︒ (cannot form a plane), and the outer edges of several centralizers 1 are on the same cylinder (the points on the outer edges of the several centralizers 1 can be connected Into a circle), the axis of the cylinder is coaxial with the axis of the inner tube 2.

[0011] The number of centralizers 1 is generally 4, and the angle between the centralizers 1 and the axis of the inner tube 2 is generally 45︒. The thickness of the centralizer 1 is generally 3-8mm to ensure bending deformation.

[0012] The upper and lower ends of the inn...

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Abstract

The invention provides an oil tube centralizer. The two ends of each centralizing piece are provided with chamfers, the included angle between each centralizing piece and the axis of an inner tube is20-70 degrees, and the outer edges of the multiple centralizing pieces are on the same cylinder shape; the axis of the cylinder shape and the axis of the inner tube are coaxial, the minimum positionsof the chamfers of the centralizing pieces can be smaller than the inner diameter of a washover cylinder, after the conical positions at the upper ends of the centralizing pieces are sleeved with thewashover cylinder, the weight of a washover tubular column presses on the centralizing pieces with the included angle between the centralizing pieces and the axis of the inner tube being 20-70 degrees, and the weight of the washover tubular column makes the centralizing pieces to generate bending force towards the interior of the washover cylinder, so that the centralizing pieces are deformed andinwards stored in the washover cylinder; through washover, falling objects such as sand which jams the tubular column can be washed over, the tubular column provided with the oil tube centralizer canbe smoothly subjected to jam releasing, the difficulty of jam releasing work can be reduced, the workover cost of an oil-water well is reduced, and the remarkable economic benefits are achieved.

Description

technical field [0001] The invention is an oil field downhole device, a tool for ensuring that the downhole oil pipe is centered in the casing, and in particular is an oil pipe centralizer. Background technique [0002] In the oil production and water injection system in the oil field, the tubing must be lowered into the casing. There is a large gap between the inner diameter of the casing and the outer diameter of the tubing. The tubing always falls to the side of the inner wall of the casing in the casing. In the downhole, the tubing falls to the side of the inner wall of the casing in the casing, which has a great impact on the tripping of the tubing, and also has a great impact on the normal operation of the downhole tools, making the working conditions of the downhole oil pumping and water injection devices worse, causing downhole Oil pumping and water injection devices have a short service life and a short production cycle, requiring frequent well shut-in for maintenan...

Claims

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Application Information

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IPC IPC(8): E21B17/10
CPCE21B17/1078
Inventor 张永法田庆国宋东王丽丽丁明梅霍虹耿冬娜
Owner 山东博诺利石油装备有限公司
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