CN2392912Y

CN2392912Y - Anti-dropping device for scraper column of casing

Info

Publication number: CN2392912Y
Application number: CN 98252378
Authority: CN
Inventors: 刘扬
Original assignee: OIL GAS DEVELOPMENT Co DAGANG OIL FIELD GROUP
Current assignee: OIL GAS DEVELOPMENT Co DAGANG OIL FIELD GROUP
Priority date: 1998-12-30
Filing date: 1998-12-30
Publication date: 2000-08-23
Anticipated expiration: 2008-12-30

Abstract

The utility model relates to an anti-dropping device for a scraping tube column of a casing tube. The utility model is characterized in that the lower part of an inner tube is a convex step, and is suspended with an outer tube through a cushion ring. The outer tube and the cushion ring are all slid on the inner tube and can rotate at omnidirection. The anti-dropping device can release buckle withdrawing torque of scraping tube column of the casing tube in a lifting process, and the dropping of scraping tube column of the casing tube can be efficiently prevented. The utility model has the advantages of simple structure, low manufacture cost, convenience, and safe operation.

Description

A kind of sleeve pipe scraping tubing string anti-dropping device

The utility model relates to a kind of petroleum industry oil, well operation sleeve pipe scraping tubing string anti-dropping device.

At present, the oil field generally all adopts the spiral scraper that sleeve pipe is carried out scraping, because the anticreep problem never is resolved for many years during sleeve pipe scraping tubing string, so workover treatment is during to the sleeve pipe scraping, down-hole liquid impact and the effect of spiral power under, often occur by fall owing to the coming off accident in shaft bottom of scraping tubing string.The sleeve pipe scraping tubing string shaft bottom that comes off not only makes troubles to workover treatment, has increased fishing workload and operating cost, accounts for the well cycle but also prolonged operation, is directly threatening the safety in production in oil field and is influencing the economic benefit in oil field.

The purpose of this utility model is: provide a kind of at oil, in the well operation process, can relief sleeve scraping tubing string move back the button moment of torsion in the process of removing, can effectively prevent the come off a kind of novel anti-dropping device in shaft bottom of sleeve pipe scraping tubing string.

Fig. 1 is the utility model structural representation

Describe in detail below in conjunction with accompanying drawing: inner tube 2 and outer tube 4 mutual sheathing, the convex shoulder in inner tube 2 lower ends And between the convex shoulder of outer tube 4 upper ends packing ring 3 is set, and the 2 suit packing rings 3 of the inner tube beyond outer tube 4. Inner tube 2 upper ends connect top connection 1. The lower end of outer tube 4 connects lower contact 5. The outer surface of inner tube 2 is light Sliding surface, connecting thread is arranged at its top, and the bottom is provided with the suspension convex shoulder.

Embodiment: when workover treatment, top connection of the present utility model directly is connected with tubing string, its underpart is connected with casing scraper.Because interior pipe and the special sleeve structure of outer tube, and packing ring and sleeve pipe all slidably, rotate so that interior pipe, outer tube between the two can be in the axial direction relative to sliding and comprehensive diametrically the rotation.In sleeve pipe scraping tubing string is gone into the well process, upwards push up its top packing ring in hydraulic shock power and spiral power effect lower outer pipe, because packing ring and outer tube can slide and rotate on inner pipe, thereby can consume well and move back the button moment of torsion.During well-flushing, flushing fluid can pass the casing scraper passage again by the passage in interior pipe and the outer tube and carry out normal clean-out service.Carry on tubing string in the process, same because packing ring and outer tube can radially comprehensive on inner pipe rotations, can consume preferably and move back the button moment of torsion.Therefore the utility model sleeve pipe scraping tubing string whole go into the well and on carry can both consuming well in the process and move back the button moment of torsion, reach and prevent that effectively sleeve pipe scraping tubing string from detaining the purpose that comes off because of moving back.

Remarkable advantage of the present utility model is: 1. can produce in removing process by relief sleeve scraping tubing string Move back the button moment of torsion, can effectively prevent coming off of scraper column of casing. 2. simple in structure, low cost of manufacture. 3. convenient operation, safe and reliable.

Claims

1. sleeve pipe scraping tubing string anti-dropping device, it is characterized in that: interior pipe (2) and outer tube (4) mutual sheathing, between the convex shoulder of the convex shoulder of interior pipe (2) lower end and outer tube (4) upper end, packing ring (3) is set, and goes up suit packing ring (3) at outer tube (4) interior pipe (2) in addition; Interior pipe (2) upper end connects top connection (1); The lower end of outer tube (4) connects lower contact (5).

2. a kind of sleeve pipe scraping tubing string anti-dropping device according to claim 1, it is characterized in that: the external surface of interior pipe (2) is a smooth surface, and connecting thread is arranged at its top, and the bottom is provided with the suspension convex shoulder.