CN2212072Y

CN2212072Y - Elastic sleeve wax scraping device

Info

Publication number: CN2212072Y
Application number: CN 94248642
Authority: CN
Inventors: 周治贤; 李景文
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-23
Filing date: 1994-12-23
Publication date: 1995-11-08
Anticipated expiration: 2004-12-23

Abstract

The utility model relates to an elastic sleeve pipe wax scraping device. The coagulation wax layer of the wall of a sleeve pipe under a well can be scraped by the elastic sleeve pipe wax scraping device, especially, a wax layer coagulated inside a deformed sleeve pipe can be scraped by the elastic sleeve pipe wax scraping device. The lower end of an oil pipe post which is placed is connected to the center pipe 1 of the elastic sleeve pipe wax scraping device, and sliding sleeves (2, 5) are arranged on two ends of the center pipe 1. The lower sliding sleeve 5 is fixed. More than five separate elastic sheet steels 4 are connected between the two sliding sleeves (2, 5). Each sheet steel bulges to form a lantern skeleton body whose two ends are thin and whose middle part is thick. A wax layer on the inner wall of the sleeve pipe can be scraped in the process that an oil pipe is placed under a well in company with that the oil pipe is placed under the well. If the sleeve pipe is deformed, the elastic sleeve pipe wax scraping device can be deformed and extended to pass through a clamping segment under the action of pressure.

Description

Elastic sleeve wax scraping device

The utility model relates to the field produces well, ties in internal surface of sleeve pipe and need scrape removing owing to contain wax in the oil, belongs to the spring-backed quill paraffin scraper.

In the Petroleum Production of oil field, owing to contain wax in the oil, in the Petroleum Production extraction, wax is tied on internal surface of sleeve pipe, and the wax layer that has is tied thicklyer, influences being lowered to of down-hole pumping unit, also influences the ordinary production of oil, needs regular wax removal.Existing sleeve pipe paraffin scraper is to be processed into strip sword sheet in the tubular lower end, and its diameter is fixed, and the tubular paraffin scraper is connected to the oil pipe lower end, is lowered in the process paraffin cutting while being lowered at oil pipe.Oil well is after long-term production, and the down-hole casing that has can deform, and can be hampered after this tubular paraffin scraper is lowered to, and paraffin cutting work can not normally be carried out.As change the minor diameter paraffin scraper owing to have spacer ring with internal surface of sleeve pipe, so scrape not thorough, this just increases workload and labour intensity.

It is not enough in the above-mentioned prior art that the purpose of this utility model is to avoid, and a kind of reducing sleeve pipe paraffin scraper that is particularly suitable for is provided, and can improve the paraffin cutting quality.

The purpose of this utility model can reach by the following technical programs: sleeve pipe is arranged in well, under in the sleeve pipe tubing string is arranged, connect on the central tube of paraffin scraper on the tubing string of bottom, there is sliding sleeve at the two ends of central tube, trap and fix, connect elastic steel sheet at interval more than 5 between two sliding sleeves, the middle part of steel disc is heaved and is formed the thick lantern frames body of two ends detail portion.With being lowered to when running into casing deformation, because the paraffin scraper that flexure strip constitutes, an end is movable sliding sleeve, under the effect of pressure, can make the flexure strip distortion by distortion place; The both sides of every flexure strip can scrape the wax on the casing wall with being lowered in the process as the blade of cutter, and unblocked, thereby can realize the design's purpose.

Enforcement of the present utility model is compared with above-mentioned prior art can have following effect: the flexure strip that this paraffin scraper is heaved by the middle part constitutes, one end installation sleeve can slide along wall, the external diameter that the middle part is heaved is bigger slightly than casing inner diameter, with being lowered to each flexure strip is contacted with inside pipe wall, and paste mutually tightly, each flexure strip all produces elastic force, can improve the paraffin cutting effect; Owing to be the elasticity paraffin scraper, the middle part diameter can change, and running into casing deformation place in being lowered to process also can be unblocked, can be used on the down-hole wax removal of reducing.

Fig. 1 is the utility model sectional drawing;

Fig. 2 is the utility model installation drawing;

Fig. 3 is an A-A sectional drawing on Fig. 2;

Fig. 4, the 5th, two ends sliding sleeve (2,5) partly cuts open B-B sectional drawing on front view and Fig. 1 on Fig. 1,2;

Fig. 6, the 7th, the master of elastic steel sheet, vertical view on Fig. 1,2, the wherein sectional drawing that has 3 places to shift out on the vertical view 7;

Fig. 8 is the moulding figure of elastic steel sheet on Fig. 1,2, and place's removed sectional view is arranged on it.

Below in conjunction with accompanying drawing will the utility model is described in further detail:

The oil field is bored completion and is lowered to sleeve pipe, is lowered to tubing string during wax removal in sleeve pipe again, connects the central tube 1 of paraffin scraper on the tubing string of bottom, can be found out in conjunction with Fig. 2 that by Fig. 1 the utility model is that sliding sleeve (2,5) is housed at the two ends of central tube 1, and low sleeve 5 is fixing.Low sleeve is threaded with central tube 1, and then fixing with locknut 6.Be connected with elastic steel sheet 4 at interval more than 5 between two sliding sleeves (2,5), every bloom middle part is heaved and is formed the thick lantern frames body of two ends detail portion.

Can make axial mounting groove 10 in advance on two sliding sleeves (2,5), steel disc 4 two ends are bumped on the groove, and the back is fixing with screw 3.For there is sliding scale at the two ends that make steel disc 4, the two ends of steel disc 4 are axial rectangular elliptical aperture (7,8) with the installing hole that cooperates of screw 3.But the installing hole at every bloom two ends is not on an axial line of central tube, and the upper and lower installing hole 7 that staggers mutually, as shown in Figure 7.For improving the paraffin cutting effect, blade 9 is made in the elastic steel sheet both sides, as removed section on Fig. 7; (right side) portion forms the inclined plane by equidirectional outward-dipping on every steel disc 4 simultaneously, and (not being periphery), then the incline direction of (left side) portion is opposite down; As being the boundary by forming lantern frames body middle part annulus, a side on top is by equidirectional outward-dipping, and every correspondence leans outward, but the opposite side of bottom D is by equidirectional outward-dipping.

Claims

1, a kind of spring-backed quill paraffin scraper, sleeve pipe is arranged in the well, be lowered to tubing string in the sleeve pipe, the tubing string lower end connects the central tube (1) of paraffin scraper, and it is characterized in that: sliding sleeve (2,5) is equipped with at the two ends of central tube (1), low sleeve (5) is fixing, elastic steel sheet (4) at interval more than 5 is arranged between two sliding sleeves (2,5), and the steel disc middle part is heaved and is formed the thick lantern frames body of two ends detail portion.

2, paraffin scraper according to claim 1 is characterized in that: the installing hole at elastic steel sheet (4) two ends is an axial rectangular elliptical aperture (8), but the installing hole at each steel disc two ends is installed on the hole (7) but stagger not on an axial line.

3, paraffin scraper according to claim 2 is characterized in that: there is blade (9) the elastic steel sheet both sides.

4, paraffin scraper according to claim 1 is characterized in that: each steel disc (4) is gone up (right side) portion by equidirectional outward-dipping, and then the incline direction of (left side) portion is opposite down.