阅读说明：本技术 一种套管刮管器 (Casing pipe scraper ) 是由 黄保黔 补声军 王文 郑波强 万文财 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种套管刮管器,包括由上至下依次螺纹连接的上接头(1)、芯轴(2)和下接头(3)；芯轴(2)中间外圆设有整体结构的刮刀(4)；刮刀(4)两端分别设有扶正套(5)；扶正套(5)内设有支撑套(6)；刮刀(4)两端插入扶正套(5)与支撑套(6)之间。本发明中的刮刀采用环形整体结构,安装使用方便可靠,杜绝零部件脱落情况,保证使用安全性。环形整体刮刀工作面工作时整个圆周方向刮削效果一致,不会出现局部残留现象,消除后续作业隐患。(The invention discloses a casing pipe scraper which comprises an upper joint (1), a mandrel (2) and a lower joint (3) which are in threaded connection in sequence from top to bottom; the outer circle of the middle of the mandrel (2) is provided with a scraper (4) with an integral structure; two ends of the scraper (4) are respectively provided with a righting sleeve (5); a supporting sleeve (6) is arranged in the righting sleeve (5); two ends of the scraper (4) are inserted between the centralizing sleeve (5) and the supporting sleeve (6). The scraper disclosed by the invention adopts an annular integral structure, is convenient and reliable to install and use, avoids the condition that parts fall off, and ensures the use safety. When the working surface of the annular integral scraper works, the scraping effect in the whole circumferential direction is consistent, the local residual phenomenon cannot occur, and the hidden danger of subsequent operation is eliminated.)

1. A casing scraper, characterized in that: comprises an upper joint (1), a mandrel (2) and a lower joint (3) which are sequentially connected by screw threads from top to bottom; the outer circle of the middle of the mandrel (2) is provided with a scraper (4) with an integral structure; two ends of the scraper (4) are respectively provided with a righting sleeve (5); a supporting sleeve (6) is arranged in the righting sleeve (5); two ends of the scraper (4) are inserted between the centralizing sleeve (5) and the supporting sleeve (6).

2. The casing scraper of claim 1 wherein: the scraper (4) is in a circular tube shape; the inner hole of the scraper (4) is a straight-through hole; an annular boss (7) is arranged at the orifice of the inner hole of the scraper (4); the middle of the excircle of the scraper (4) is thick, the two ends of the excircle are thin, and a small-pitch spiral groove (8) and a group of large-pitch spiral grooves (9) are arranged at the middle large-diameter section; one end of the coarse pitch spiral groove (9) is connected with the closed split groove (10), and the other end of the coarse pitch spiral groove (9) is connected with the through split groove (11); the closed split groove (10) and the through split groove (11) are both straight grooves.

3. A casing scraper according to claim 2 in which: the closed split grooves (10) and the through split grooves (11) at the same end of the scraper (4) are arranged in a staggered mode.

4. The casing scraper of claim 1 wherein: the mandrel (2) is of a slender tube structure; the inner hole of the mandrel (2) is a straight-through hole; external thread sections (12) are arranged at the two ends of the mandrel (2); the inner side of the external thread section (12) is provided with a smooth shaft section (13) matched with the centralizing sleeve (5); the optical axis section (13) is provided with an annular limiting boss (14).

5. The casing scraper of claim 1 wherein: the centering sleeve (5) is of a short pipe structure, and the inner circle of the centering sleeve (5) is a stepped hole; the small aperture of the inner circle of the centering sleeve (5) is matched with the outer circles at the two ends of the mandrel (2); the large aperture of the inner circle of the centering sleeve (5) is matched with the outer circles at two ends of the scraper (4); chamfers (15) are arranged on two end faces of the excircle of the centering sleeve (5); the excircle of the righting sleeve (5) is provided with a group of rectangular through grooves (16) which are uniformly distributed along the excircle.

6. The casing scraper of claim 1 wherein: the supporting sleeve (6) is of a short pipe structure, and the length of the supporting sleeve (6) corresponds to the length of the large aperture section of the inner circle of the centering sleeve (5); the inner hole of the centering sleeve (5) is a straight-through hole matched with the optical axis section (13) of the mandrel (2); the excircle of the centralizing sleeve (5) is provided with an annular groove (17) matched with the annular boss (7) at the orifice of the scraper (4).

Technical Field

The invention relates to a casing pipe scraper, and belongs to the technical field of well repair equipment.

Background

In the process of petroleum drilling and oil extraction, the inner wall of the casing can be damaged under the action of formation pressure and metal corrosion and in the process of well completion operation, and the problems of diameter shrinkage, breakage, burrs and the like occur.

Casing scrapers are a well repair tool with reliable performance. The device is mainly used for removing dirt such as cement blocks, cement rings, hard wax, various salt crystals or sediments, perforation burrs and ferric oxide generated by sleeve corrosion on the inner wall of the sleeve, so that the device can be conveniently and smoothly fed into various downhole tools without resistance, and the success rate of subsequent tool feeding and operation completion is improved.

At present, the scraper part of a casing pipe scraper used in an oil field is combined by a plurality of split scrapers to realize the scraping operation of the whole circumference, so that the structure is complex, the processing is difficult, and the asynchronous condition often occurs when the casing pipe scraper is used, so that part of the scrapers do not operate, the inner wall of the casing pipe still remains after the scraping operation, and hidden troubles are buried for subsequent operations.

Due to the fact that the split scrapers are combined in the structure, the connection positions among the structures are not tight, parts of parts are prone to falling off, serious potential safety hazards exist, and finally underground accidents are caused.

Disclosure of Invention

The invention aims to provide a casing scraper, which aims to solve the technical problem of potential safety hazard caused by easy falling of the existing casing scraper, and improve the stability and reliability of the casing scraper in underground use, thereby overcoming the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a casing pipe scraper which comprises an upper joint, a mandrel and a lower joint which are sequentially in threaded connection from top to bottom; the outer circle of the middle of the mandrel is provided with a scraper with an integral structure; two ends of the scraper are respectively provided with a righting sleeve; a supporting sleeve is arranged in the righting sleeve; the two ends of the scraper are inserted between the righting sleeve and the supporting sleeve.

In the casing pipe scraper, the scraper is in a circular pipe shape; the inner hole of the scraper is a straight-through hole; an annular boss is arranged at the orifice of the inner hole of the scraper; the middle of the excircle of the scraper is thick, the two ends of the excircle of the scraper are thin, and a small-pitch spiral groove and a group of large-pitch spiral grooves are arranged in the middle large-diameter section of the excircle of the scraper; one end of the coarse pitch spiral groove is connected with the closed split groove, and the other end of the coarse pitch spiral groove is connected with the through split groove; the closed split groove and the through split groove are both straight grooves.

In the casing pipe scraper, the closed split grooves and the through split grooves at the same end of the scraper are arranged in a staggered manner.

In the casing pipe scraper, the mandrel is of an elongated tube structure; the inner hole of the mandrel is a straight-through hole; external thread sections are arranged at two ends of the mandrel; the inner side of the external thread section is an optical axis section matched with the centering sleeve; an annular limiting boss is arranged on the optical axis section.

In the casing pipe scraper, the centering sleeve is of a short pipe structure, and the inner circle of the centering sleeve is a stepped hole; the small aperture of the inner circle of the centralizing sleeve is matched with the outer circles at two ends of the mandrel; the large aperture of the inner circle of the centering sleeve is matched with the outer circles at two ends of the scraper; chamfers are arranged on two end faces of the excircle of the centering sleeve; the excircle of the righting sleeve is provided with a group of rectangular through grooves which are uniformly distributed along the excircle.

In the casing pipe scraper, the support sleeve is of a short pipe structure, and the length of the support sleeve corresponds to the length of the large aperture section of the inner circle of the centering sleeve; the inner hole of the centering sleeve is a straight-through hole matched with the optical axis section of the mandrel; the excircle of the righting sleeve is provided with a ring groove matched with the annular boss at the hole of the scraper.

Due to the adoption of the technical scheme, compared with the prior art, the scraper disclosed by the invention has the advantages that the scraper is of an annular integral structure, the installation and the use are convenient and reliable, the condition that parts fall off is avoided, and the use safety is ensured. When the working surface of the annular integral scraper works, the scraping effect in the whole circumferential direction is consistent, the local residual phenomenon cannot occur, and the hidden danger of subsequent operation is eliminated.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a mandrel of the present invention;

FIG. 3 is a schematic view of the construction of the annular doctor blade of the invention;

FIG. 4 is a schematic structural view of a centralizing sleeve of the present invention;

fig. 5 is a schematic structural view of the support sleeve of the present invention.

The labels in the figures are: 1-upper joint, 2-mandrel, 3-lower joint, 4-scraper, 5-righting sleeve, 6-supporting sleeve, 7-annular boss, 8-small pitch spiral groove, 9-large pitch spiral groove, 10-closed split groove, 11-through split groove, 12-external thread section, 13-optical shaft section, 14-annular limiting boss, 15-chamfer, 16-rectangular through groove and 17-annular groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The casing scraper disclosed by the invention comprises an upper joint 1, a mandrel 2 and a lower joint 3 which are sequentially in threaded connection from top to bottom as shown in figures 1-5; the outer circle of the middle of the mandrel 2 is provided with a scraper 4 with an integral structure; two ends of the scraper 4 are respectively provided with a righting sleeve 5; a supporting sleeve 6 is arranged in the righting sleeve 5; the two ends of the scraper 4 are inserted between the centralizing sleeve 5 and the supporting sleeve 6.

The scraper 4 is shown in fig. 3, 4 is in a circular tube shape; the inner hole of the scraper 4 is a straight-through hole; an annular boss 7 is arranged at the orifice of the inner hole of the scraper 4; the middle of the excircle of the scraper 4 is thick, the two ends of the excircle are thin, and a large-diameter section in the middle is provided with a small-pitch spiral groove 8 and a group of large-pitch spiral grooves 9; one end of the coarse pitch spiral groove 9 is connected with the closed split groove 10, and the other end of the coarse pitch spiral groove 9 is connected with the through split groove 11; the closed split groove 10 and the through split groove 11 are both straight grooves. The closed split grooves 10 at the same end of the scraper 4 are arranged in a staggered way with the through split grooves 11.

The mandrel 2 is shown in fig. 2, and the mandrel 2 is in an elongated tube structure; the inner hole of the mandrel 2 is a straight-through hole; the two ends of the mandrel 2 are provided with external thread sections 12; the inner side of the external thread section 12 is provided with an optical axis section 13 matched with the righting sleeve 5; the optical axis section 13 is provided with an annular limiting boss 14.

The centralizing sleeve 5 is shown in fig. 4, the centralizing sleeve 5 is of a short pipe structure, and the inner circle of the centralizing sleeve 5 is a step hole; the small aperture of the inner circle of the centering sleeve 5 is matched with the outer circles of the two ends of the mandrel 2; the large aperture of the inner circle of the centering sleeve 5 is matched with the outer circles of the two ends of the scraper 4; two outer circles of the centering sleeve 5 are provided with chamfers 15; the excircle of the righting sleeve 5 is provided with a group of rectangular through grooves 16 uniformly distributed along the excircle.

As shown in fig. 5, the supporting sleeve 6 is a short pipe structure, and the length of the supporting sleeve 6 corresponds to the length of the large aperture of the inner circle of the centering sleeve 5; the inner hole of the centering sleeve 5 is a straight-through hole matched with the optical axis section 13 of the mandrel 2; the excircle of the centralizing sleeve 5 is provided with a ring groove 17 matched with the annular boss 7 at the orifice of the scraper 4.