Oil tube centralizer

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...

AI Technical Summary

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. When this kind of tubing centralizer is stuck by sand or other falling objects in the well, it cannot be lowered into the casing milling barrel for casing Milling will bring difficulties to work such as jam release, resulting in a large workover workload and greatly increasing the workover cost of oil and water wells

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