Downhole casing wire scraper

Abstract

The invention discloses a steel wire scraper for downhole casings. The steel wire scraper comprises a barrel, scraper brushes and centralizing pipes. A plurality of rows of through hole groups are formed in the side walls of the barrel at intervals, the rows of through hole groups comprise different quantities of through holes which are uniformly formed along circumferential directions, and the through holes are formed in the outer walls of the barrel in a staggered manner at intervals; each cylindrical centralizing pipe is fixedly inserted in the corresponding through hole; the scraper brushes are steel wire rope heads, a plurality of steel wires are twisted to form each steel wire rope head, the quantity of the scraper brushes is identical to that of the centralizing pipes, and each scraper brush is locally fixedly inserted in the corresponding centralizing pipe. The steel wire scraper for the downhole casings can be dragged and turned up and down in the casings along drill rods, and casing walls can be cleaned while the inner walls of the casings are scraped. Compared with the traditional scale scraping devices, the steel wire scraper has the advantages that the steel wire scraper is simple in structure, easy to machine and high in operation efficiency; casing scale with different thicknesses can be thoroughly cleaned in single stroke, damage to the inner walls of the casings can be prevented, the operation cost and operation risks can be reduced to a great extent, the steel wire scraper is favorable for follow-up downhole operation, and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a downhole casing wire scraper. Background technique [0002] Common downhole casing cleaning methods mainly include chemical cleaning and mechanical cleaning. The chemical cleaning method has a certain corrosion on the downhole casing, which is costly and easy to cause formation pollution; while the scraper usually used in the traditional mechanical cleaning method often has the problem of incomplete scraping of the casing, which is harmful to cement chips, sand, soil, etc. in the casing. The cleaning effect of paraffin, oil and other sundries is poor, and it has the disadvantages of long construction period and low descaling efficiency. In addition, due to the problem of unclean cleaning, the residues in the casing are easy to cause damage to the secondary casing, increasing the operating costs and operating risks. Therefore, be badly in need of developi...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a downhole casing wire scraper that solves the problems of poor cleaning effect, long construction period and low descaling efficiency of cement chips, sand, paraffin, oil stains and other sundries in the downhole casing

Images