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Variable-diameter casing scraper

A scraper and variable-diameter technology, which is applied in the direction of cleaning equipment, wellbore/well parts, earthwork drilling, etc., can solve the problems of limited variable diameter range and inability to meet scraping requirements

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used casing scraper with variable diameter function has a limited variable diameter range, and cannot meet the scraping of casing inner diameter combinations with a unilateral diameter expansion of more than 30 mm.

Method used

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  • Variable-diameter casing scraper
  • Variable-diameter casing scraper
  • Variable-diameter casing scraper

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0040] figure 1 The overall structure of the casing scraper 10 according to the embodiment of the present invention is schematically shown. figure 2 Schematically shows figure 1 A to enlarge the structure locally. image 3 Schematically shows figure 1 The B direction partially enlarges the structure. Figure 4 Schematically shows figure 1 C to local enlargement structure. Figure 5 Schematically shows figure 1 D to partially enlarge the structure. Figure 6 Schematically shows figure 1 The E is to enlarge the structure locally. Figure 7 Schematically shows the matching structure of the leaf spring 3 and the scraper 4 in the embodiment of the present invention. Figure 8 The overall structure of the doctor blade 41 according to the embodiment of the p...

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PUM

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Abstract

The invention provides a variable-diameter casing scraper. The variable-diameter casing scraper is characterized in that an upper joint and a lower joint are arranged at two ends of a mandrel, and a pressure transmission hole is formed in the mandrel. The end, close to the upper joint, of the mandrel is sleeved with a guide cylinder, the guide cylinder is sleeved with a plate spring, and the middle of the plate spring is sleeved with a scraping knife. One end of the plate spring is connected with the upper joint, and the other end of the plate spring is connected with a push cylinder. The push cylinder is connected with a piston, the piston and the mandrel are pre-fixed, and a hydraulic cylinder sleeve is arranged on the piston in a sleeving mode and located at the position close to the pressure transmission hole. The guide cylinder has a certain radian so as to guide the plate spring and the scraping knife to radially expand, and the plate spring is of an arch structure with the certain radian so as to drive the scraping knife to radially expand. According to the variable-diameter casing scraper, scraping of a combined casing of a technical casing and a tail pipe can be completed by adopting a scraping pipe column, and the purposes of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency can be achieved on the premise of ensuring the safety of the scraping operation.

Description

technical field [0001] The invention relates to the technical field of oil and gas well completion and downhole operation scraping casing operations, in particular to a variable-diameter casing scraper. Background technique [0002] During the drilling, completion and production operations of oil and gas wells, removing foreign matter such as perforation burrs, plugging residues and salt scales in the inner wall of the casing is an important process in the workover operation. Other downhole tools have important roles to play. For the wellbore structure with 127mm liner composite casing hanging below the 177.8mm technical casing, the technical casing and liner should be scraped at the same time in the following situations: deburring of technical casing and liner after perforation, chemical plugging Finally, remove the adhering chemical blocking agent, and clean up dead oil, dead wax and salt scale during the production process. For combined casings, the current common metho...

Claims

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Application Information

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IPC IPC(8): E21B37/04
CPCE21B37/04
Inventor 李友培刘殷韬黎洪董海峰熊昕东史雪枝乔智国王孝刚彭容容夏彪
Owner CHINA PETROLEUM & CHEM CORP
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