Oilfield workover device

Abstract

The invention relates to a workover device, in particular to an oilfield workover device, and belongs to the technical field of oil equipment. The oilfield workover device comprises an upper joint, aturbine group, a scraping device, a lower joint, a drift diameter bit, and the like. According to the workover device, before scraping operation is conducted, drift diameter operation is conducted through the drift diameter bit, attachments on the inner wall of a casing pipe is preliminarily removed, scraping force born by the scraping device during scraping operation is reduced, the casing pipe attachments are processed to a size to facilitate shell scraping and smooth lowering of upper parts, then scraping operation is conducted through the scraping device, wherein scraping operation is divided for two times, the first time is the preliminary scraping of a lower conical scraping part and used for gradually scraping the attachments to be of a thin-walled structure, the second time is thefinal scraping of an upper cylindrical scraping part and used for thoroughly scraping attachments to the thin-walled structure, because scraping operation is divided for two times, born scraping forcein scraping operation is reduced again, loss of scraping ability caused by damage of a scraper in scraping operation is avoided, and normal operation of scraping operation is ensured.

Description

technical field [0001] The invention relates to a workover device, in particular to an oil field workover device, which belongs to the technical field of petroleum equipment. Background technique [0002] In the process of oilfield production, well workover operations are often performed, and casing scraping is a common procedure in well workover operations. Cement blocks, cement sheath, hard wax, various salt crystals and deposits, perforation burrs, and iron oxide produced after casing corrosion are often attached to the inner wall of the casing. Perform cleanup operations for follow-up tasks. At present, the common workover device is the casing scraper. Although this workover device has been widely used, it is difficult to remove the casing attachments such as cement blocks, cement sheaths, hard wax, various salt crystals and deposits, and perforation burrs. And when the iron oxide produced after casing corrosion is large in volume or high in hardness, it is difficult t...

AI Technical Summary

Problems solved by technology

At present, the common workover device is the casing scraper. Although this workover device has been widely used, it is difficult to detect the casing attachments such as cement blocks, cement sheaths, hard wax, various salt crystals and deposits, and perforation burrs. And when the iron oxide produced after casing corrosion is large in volume or high in hardness, it is difficult to completely scrape it off with the scraper of the existing workover device, and the scraper will be damaged due to too much scraping force during the scraping operation. Damage and knife jamming may even cause the loss of the scraping ability of the device, resulting in the stop of the scraping operation, increasing the cost of workover and the cycle of workover

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