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Underground tubular column centralising device

A downhole pipe string and centralizer technology, which is applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of centralizer tripping out of the well, poor integrity of centralizer, and scattered parts of centralizer, so as to avoid falling objects in the well Accidents, reduction of production costs, and simplification of the internal structure

Inactive Publication Date: 2007-07-11
SHENGLI OIL FIELD SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the spring needs to be installed radially, and the structure between the friction block and the centralizer is complicated, which limits the radial size of the core tube of the centralizer, thereby restricting the compatibility between the inner diameter of the core tube and the oil pipe, and making the core tube and the upper and lower strings The threaded connection of the company only uses ordinary threads, which often leads to accidents where the centralizer trips and falls into the well.
However, the structural design of the centralizer is poor in integrity, and the parts of the centralizer are scattered after falling into the well, which also complicates the salvage work after falling into the well

Method used

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  • Underground tubular column centralising device
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Embodiment Construction

[0007] The present invention will be further described in detail below in conjunction with the accompanying drawings: Referring to the accompanying drawings, a downhole pipe string centralizer has a coupling 1, a centralizer 2, a core pipe 3 and a friction block 5, and the friction block 5 is installed outside the centralizer 2 In the groove on the surface, the core pipe 3 is put through the centering body 2 , the spring piece 4 is installed between the friction block 5 and the centering body 2 , and the pressure cap 8 is installed on the bottom of the centering body 2 . The inner diameter of the upper part of the centralizer 2 is provided with an inner boss, and the outer diameter of the lower part is provided with threads and anti-tripping grooves; the outer diameter of both ends of the core pipe 3 is tapered and has threads, and the outer diameter of the middle part is larger than the outer diameter of both ends to form an outer boss. This outer boss cooperates with the inne...

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Abstract

The present invention discloses a underground pipe column centralizer used in petroleum industry and applicable to underground production pipe column and workover treatment pipe column of various wells. Said invention has collar, centralization body, core pipe and friction block, the friction block is mounted in the recessed groove of external surface of the centralization body, between friction block and centralization body a sheet spring is mounted, and a pressure cap is mounted in the lower portion of the centralization body. Said invention is simple in structure and is easy to manufacture.

Description

technical field [0001] The invention relates to oil production equipment in the petroleum industry, in particular to a downhole pipe string centralizer, which is suitable for downhole production pipe strings and workover operation pipe strings of various wells. Background technique [0002] At the production site of the petroleum industry, the downhole strings of various wells need centralizers to center them and meet the needs of production and workover. In the existing column centralizers, there are two types of steel centralizers and elastic centralizers. The centralizing friction block of the rigid centralizer is connected with the main body of the centralizer by means of welding and casting, and the conditions of use are limited. Such as: in November 1987, Shengli Oilfield Oil Production Technology Research Institute edited and published "Oil Production Technology Compendium" in the sixth chapter, page 44, the centralizers involved in "sand control technology" belong t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/10
Inventor 邢子晶
Owner SHENGLI OIL FIELD SINOPEC