CN205243473U - Pipeline scraper - Google Patents

Abstract

<b>The utility model discloses a pipe scraper, which includes a mandrel (12), on which three scraper assemblies (13) with circumferential angles differing by 30° are arranged; the scraper assembly (13) includes A pair of left-handed scrapers (10) and a pair of right-handed scrapers (7) evenly spaced; each scraper is connected to the inner sleeve (5) of the scraper holder set on the mandrel (12) through the scraper holder (6); A set of stacked disc springs (9) are provided in the gap between the scraper frame inner sleeve (5) and the scraper, and the disc springs (9) are sleeved on the disc spring seat (8). The utility model is provided with a recycling cylinder at the bottom of a plurality of scraper assemblies, which is used to recover the scraped objects falling from the casing wall, so as to prevent the scraped objects from polluting the inner environment of the casing. The utility model not only has a simple structure and is convenient to assemble, but also the unique design of the scraping part can make the scraping more comprehensive and efficient, and at the same time, it ensures a clean environment inside the casing. </b>

Description

a scraper

technical field

The utility model relates to a pipe scraper, which belongs to the technical field of drilling tools.

Background technique

The casing scraper can be used to remove cement block, cement sheath, hard wax, various salt crystals and deposits, perforation burrs and iron oxide produced after casing corrosion on the inner wall of the casing, so that it can be unimpeded Various downhole tools are put into the ground. Especially when the annular space between the running tool and the inner wall of the casing is small, the next step of construction should be carried out after sufficient scraping. At present, the use of scrapers has become an indispensable process in some domestic oil fields and foreign oil and water well construction operations, and its purpose is to improve the success rate of tool running operations. For example, the setting success rate of the packer, etc. Due to the complex downhole conditions, the diameter of the casing in some well sections may change, so the casing scraper whose diameter cannot change with the inner diameter of the casing may cause damage to the casing. Moreover, the scraping of the casing pipe by the general casing scraper is not clean, and multiple scrapings are required, resulting in long scraping time and increasing the construction cost. At the same time, the falling objects produced by the general scraper scraping the casing will pollute the downhole environment.

Utility model content

The purpose of this utility model is to provide a scraper, which can not only fit the casing for scraping, but also reduce the number of scraping times, so as to achieve the minimum number of scraping times and the shortest time under the same cleaning conditions, thereby improving the efficiency of scraping. Well efficiency; and while scraping, recover scraped objects to avoid scraping objects from polluting the downhole environment.

The technical scheme of the utility model is achieved in that:

A pipe scraper of the present utility model includes a mandrel on which three scraper assemblies with a difference of 30° in circumferential angle are arranged; the scraper assembly includes a pair of left-handed scrapers and a pair of right-handed scrapers evenly spaced along the circumference; each Each scraper is respectively connected to the inner sleeve of the scraper holder set on the mandrel through the scraper holder; a group of relatively stacked disc springs are arranged in the gap between the inner sleeve of the scraper holder and the scraper, and the disc springs are sleeved on the disc spring seat.

In the aforementioned scraper, one side of the disc spring is convex, and the other side is concave; a group of disc springs stacked oppositely is concave to concave, and convex to convex stacked on the cylinder of the disc spring seat.

In the aforementioned scraper, the two ends of the three scraper assemblies are respectively provided with a centralizer, and the end of the centralizer away from the scraper assembly is provided with a centralizer inner sleeve; a positioning spacer ring is provided between the scraper assembly and the scraper assembly, and the positioning spacer ring The boss on the top is fixedly connected with the positioning groove on the scraper frame.

In the aforementioned pipe scraper, the upper end of the mandrel is threadedly connected to the upper joint and fixed by a back-stop screw; the lower end of the mandrel is provided with a recovery cylinder and is threadedly connected to the lower joint.

Due to the adoption of the above technical solution, compared with the prior art, the utility model adopts a disc spring structure, which can adjust the scraping range of the scraper according to the compression amount, and has better applicability than the general scraper. A scraper assembly with three left and right rotating scraper structures is used to make the scraping cleaner. The three scraper assemblies are arranged in the axial direction, and each scraper assembly is installed with a 30° rotation in the circumferential direction. The second set of scraper sets is based on the first set, and rotates 30° clockwise in the radial direction. The third set of scraper sets is based on the second set. As a benchmark, rotate 30° in the radial direction, a total of 12 scrapers, one scraper is responsible for 30°, and 12 scrapers can cover the casing wall at 360°, so that 360° scraping without dead ends can make the scraping cleaner and realize the circumference 360° scraping can scrape the casing wall in all directions to improve the scraping efficiency. The inside of the scraper blade has a 10° cutting angle, which enables it to smoothly scrape hard objects attached to the tube wall. There is a recovery cylinder at the end of the scraper, which can recover the falling objects generated by scraping the casing wall and prevent the environment inside the casing from being polluted by garbage. Therefore, the utility model not only has a simple structure and is convenient to assemble, but also the unique design of the scraping part can make the scraping more comprehensive and efficient, and at the same time, ensure a clean environment inside the casing.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the structural representation of scraper holder;

Fig. 3 is the structural representation of scraper;

Fig. 4 is a schematic diagram of the disc spring structure;

Fig. 5 is a schematic diagram of the structure of the disc spring seat.

The marks in the picture are: 1-upper joint, 2-stop screw, 3-righting inner sleeve, 4-righting body, 5-scraper holder inner sleeve, 6-scraper holder, 7-right-handed scraper, 8-disc spring Seat, 9-disc spring, 10-left-handed scraper, 11-positioning spacer, 12-mandrel, 13-scraper assembly, 14-boss, 15-recovery cylinder, 16-lower joint, 17-positioning groove.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the utility model.

The utility model is formed according to the following improved method of a scraper, as shown in Figure 1-5, the method is an improvement to the diameter that cannot change with the inner diameter of the casing or adopts a cylindrical spring scraper; three Two scraper assemblies with a circumferential angle difference of 30° scrape at the same time to achieve 360° no dead angle scraping; each scraper assembly is equipped with a pair of left-handed scrapers and a pair of right-handed scrapers evenly spaced along the circumference to ensure that the The balance of the force; each scraper bottom is equipped with a set of stacked disc springs to realize the radial contraction and extension of the scraper, so that the scraper can automatically adapt to the needs of different inner diameter tubes, and can also make the scraper and the tube wall tightly The two ends of the scraper are tapered so that the scraper can smoothly enter the small inner diameter tube from the large inner diameter tube for scraping. A group of relatively stacked disc springs can ensure that the scraper can fit the pipe wall well, and at the same time, it will not scratch the casing wall or cause the scraper to be stuck in the casing due to excessive elasticity. The scraper assemblies are separated by a positioning spacer ring, and the positioning grooves provided on the positioning ring ensure that the circumferential angle between each scraper assembly always differs by 30°. The bottom of the three scraper assemblies is provided with a recovery cylinder, which is used to recover the scrapings falling from the casing wall, so as to prevent the scrapings from polluting the environment inside the casing. The cutting angle of the scraper blade is 10 degrees, and the combination of the cutting angle and the helical angle of the scraper can smoothly scrape the hard objects attached to the pipe wall with a small driving force.

A pipe scraper of the present invention constituted according to the method described above, as shown in Figures 1-5, includes a mandrel 12 on which three scraper assemblies 13 with circumferential angles of 30° differ; the scraper assembly 13 includes A pair of left-handed scrapers 10 and a pair of right-handed scrapers 7 evenly spaced around the circumference; each scraper is connected to the inner sleeve 5 of the scraper holder set on the mandrel 12 through the scraper holder 6 respectively; between the inner sleeve 5 of the scraper holder and the scraper A group of relatively stacked disc springs 9 are arranged in the gap, and the disc springs 9 are sleeved on the disc spring seat 8. One side of disc spring 9 is a convex surface, and the other side is concave; a group of relative stacked disc springs 9 are concave to concave, and convex to convex are stacked on the cylinder of disc spring seat 8. The two ends of the three scraper assemblies 13 are respectively provided with a centralizer 4, and the end of the centralizer 4 away from the scraper assembly 13 is provided with a centralizer inner sleeve 3; between the scraper assembly 13 and the scraper assembly 13, a positioning spacer ring 11 is provided, and the positioning spacer ring The boss 14 on 11 is fixedly connected with the positioning groove 17 on the scraper frame 6 . The upper end of the mandrel 12 is threadedly connected with the upper joint 1 and fixed by the stop screw 2;

Example

This example is shown in Figure 1. It mainly consists of upper joint 1, stop screw 2, centralizing inner sleeve 3, centralizing body 4, scraper holder inner sleeve 5, scraper holder 6, right-handed scraper 7, disc spring seat 8, disc spring 9 , Left-handed scraper 10, positioning spacer 11, mandrel 12, recovery cylinder 15 and lower joint 16 constitute.

The upper joint 1 is in the shape of a cylinder, with steps and water eye channels on the inner wall, and connecting threads at both ends; the upper thread is a standard joint thread, which can be connected with other tools with standard threads; the lower thread can be designed with standard or non-standard threads as required , which is mainly used for threaded connection with the upper end of the mandrel 12, and there is a seal at the connecting part; there is a threaded hole at the end of the upper joint 1, and the stop screw 2 passes through the threaded hole to connect the upper joint 1 and the mandrel 12 , to prevent refunds. The upper and lower ends of the mandrel 12 are threaded, and the two ends of the upper end thread are provided with grooves, which are used for adornment of O-rings and play a sealing role. There is a boss at the tail end of the mandrel 12, and there are threads below the boss, and the mandrel 12 is connected with the recovery cylinder 15 by threads. The centralizing inner sleeve 3 passes through the mandrel 12 and fits the upper joint 1 , the centralizing body 4 passes through the centralizing inner sleeve 3 , the scraper frame 6 passes through the scraper frame inner sleeve 5 , and fits the centralizing body 4 together. The scraping part is composed of three scraper assemblies and two positioning spacers 11 as shown in FIG. 1 . The function of the two positioning spacers 11 is to separate the three scraper assemblies so that the scraper assembly can work normally. The three scraper assemblies are arranged axially, and each scraper assembly differs by 30° in the circumferential direction. During specific installation, the second group of scrapers is based on the first group and rotates 30° clockwise in the radial direction, and the third group of scrapers is based on the second group and rotates 30° in the radial direction. There are 12 scrapers in total, one Responsible for 30°, 12 scrapers can cover the casing wall at 360°, so that it can scrape at 360° without dead angle, making the scraping cleaner. As shown in Figure 1, the scraper assembly is composed of a scraper holder inner sleeve 5, a scraper holder 6, a right-handed scraper 7, a disc spring seat 8 (see Figure 5), a disc spring 9 (see Figure 4), and a left-handed scraper 10. The function of the disc spring 8 and the disc spring seat 9 is to prop up the scraper before going into the well. When going down the well, due to the compressibility of the disc spring 9, the scraper with an outer diameter slightly larger than the casing can have a certain force when entering the well. At the same time, due to the reasonable design, when the casing wall is fitted, the bonding force is not too large, and the scraper is prevented from being stuck in the casing. The right-handed scraper 7 and the left-handed scraper 10 are placed between the disc spring 9 and the scraper frame 6 . The inboard of the tooth of right-handed scraper 7 and left-handed scraper 10 has a 10 ° of inclination angle, as Fig. 3, owing to there is 10 ° of inclination angle in inner side, can make more smooth scraping sleeve pipe wall. The use of left-handed and right-handed scraping blades can scrape the casing wall more cleanly. Each group of scraper groups has a radial angle of 30° with the adjacent scraper group, and there are four scraper blades in each group of scraper groups that are evenly distributed around the circumference, so that 360° scraping of the circumference is realized, so it can be used in all directions. The casing wall is scraped. There is screw thread at the end of mandrel 12, is threadedly connected with recovery cylinder 15 tail ends. The inner wall of the tail end of the mandrel 12 has threads and is threadedly connected with the front end of the lower joint 16 .

Claims (4)

1. A pipe scraper, comprising a mandrel (12), characterized in that: three scraper assemblies (13) with a difference in circumferential angle of 30° are arranged on the mandrel (12); the scraper assemblies (13) include uniform intervals along the circumference A pair of left-handed scrapers (10) and a pair of right-handed scrapers (7) for the cloth; each scraper is connected to the inner sleeve (5) of the scraper holder set on the mandrel (12) through the scraper holder (6); A group of relatively stacked disc springs (9) are provided in the gap between the inner sleeve (5) and the scraper, and the disc springs (9) are sleeved on the disc spring seat (8). 2. The pipe scraper according to claim 1, characterized in that: one side of the disc spring (9) is convex, and the other side is concave; a group of stacked disc springs (9) are concave to concave, convex Put on the cylinder of the disc spring seat (8) after laminating the convex surface. 3. The pipe scraper according to claim 2, characterized in that: the two ends of the three scraper assemblies (13) are respectively provided with centralizers (4), and the centralizers (4) are far away from the end of the scraper assembly (13) There is a righting inner sleeve (3); a positioning spacer (11) is provided between the scraper assembly (13) and the scraper assembly (13), and the boss (14) on the positioning spacer (11) and the scraper holder (6) The positioning groove (17) on the positioning connection. 4. The pipe scraper according to claim 3, characterized in that: the upper end of the mandrel (12) is threadedly connected with the upper joint (1) and fixed by the stop screw (2); the lower end of the mandrel (12) is set There is a recovery cylinder (15) and is threadedly connected with the lower joint (16).