Hydraulic pitching type pipe scraper

Abstract

The utility model discloses a hydraulic pitching type pipe scraper which comprises a pipe scraper body, two sets of scraper blades are installed on the pipe scraper body in an up-down staggered mode, and each set of scraper blades are evenly distributed in the circumferential direction of the pipe scraper body. A first connecting rod, a second connecting rod and a third connecting rod are sequentially arranged on the inner side of the scraper blade from top to bottom and connected with the pipe scraper body through connecting pins. The structure disclosed by the utility model meets field use requirements, and is simple to operate, wide in application, safe, reliable and convenient to maintain; the device can be used in a multifunctional mode, can be tripped in independently and can be used while drilling, pipe scraping cleaning operation of two different specifications of casing pipes can be achieved only by tripping in a tool string once, meanwhile, the tool is designed to be in fit with the operation sequence of one-time pipe scraping operation on site from bottom to top, and the device is suitable for conventional pipe scraping operation on site; and the connecting rod type telescopic blade has a larger pipe scraping range.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of downhole operation, especially relates to a hydraulic ball throwing type pipe scraper. BACKGROUND

[0002] The extension of the conventional pipe scraper blade is mainly hydraulic spring type and hydraulic slider type. The spring type structure is to press the spring inward through the casing to realize the pipe scraping function, and this structure is suitable for light scaling or conventional well conditions, and the application range of the casing is single. The patent with the application number 202411128899.5 discloses an activated pipe scraper, which belongs to this category. The slider type is to drive the piston through the hydraulic pressure, and the blade is pushed to contact the pipe wall to clean the pipe wall. This structure has large scraping force and is suitable for complex well conditions. However, the slider structure is easily limited by the tool cavity size, and the radial variable range is small, which limits the use range of the pipe scraper. The patent with the application number 202311436371.X discloses a continuous oil pipe high-efficiency hydraulic pipe scraper, which belongs to this category.

[0003] The patent with the application number 202411096134.8 discloses a ball-throwing pressurized variable-diameter pipe scraper, which includes a connecting rod structure, a scraper body, a shear pin, and a steel ball. The structure has a complex use process and needs to be pressed multiple times to realize the variable-diameter conversion and the flow channel circulation. The connecting rod part of the structure is completely exposed outside the tool body, and the connecting rod part has a high risk of damage when the tool string is lowered, and it does not have on-site practicality. At the same time, in the field pipe scraping operation, the conventional operation process of one trip is to start operation from a small specification, that is, to operate from bottom to top. The wellbore washing fluid can flow naturally downward, helping to flush and carry the scraped mud and scaling debris, and reducing the risk of blockage. However, for severe scaling or horizontal sections and other special conditions, self-top-to-bottom or specific direction use is adopted. This structure can only be used in special conditions and cannot be applied to regular operations. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of hydraulic ball throwing type pipe scraper, to solve the above-mentioned problems.

[0005] The utility model is realized as follows: a kind of hydraulic ball throwing type pipe scraper, including scraper body, two groups of scraper blades are installed in scraper body staggered, each group of scraper blades is distributed on the circumference of scraper body;The scraper blade inner side is sequentially provided with connecting rod one, connecting rod two and connecting rod three from top to bottom, and connecting rod one, connecting rod two and connecting rod three are connected with scraper body by connecting pin respectively;Multiple guide grooves are set up on the scraper body, and the end part of connecting rod one and connecting rod two is fixed on the scraper body respectively, and the end part of connecting rod three is installed in the guide groove of scraper body.

[0006] Further, the scraper body is internally provided with a center flow channel, and the scraper body is sequentially provided with a mandrel, a piston, an extension mandrel, a shearing cylinder and a lower joint from top to bottom, the piston is sleeved on the mandrel, the extension mandrel is sleeved with the mandrel, and the shearing cylinder is connected with the extension mandrel through a shearing pin.

[0007] Further, the piston is externally sleeved with a spring between the piston and the scraper body.

[0008] Further, the piston is externally sleeved with a spring between the piston and the scraper body.

[0009] Further, the extension mandrel is provided with a flow hole one, and the shearing cylinder is provided with a flow hole two.

[0010] Further, each group of the scraper blades comprises three scraper blades, and each scraper blade is provided with a guide groove on each side.

[0011] Compared with the prior art, the hydraulic ball-throwing type scraper has the advantages that:

[0012] The utility model discloses a hydraulic ball-throwing type scraper, which has the advantages that the structure meets the requirements of field use, the operation is simple, the application is wide, the safety is reliable, the maintenance is convenient, the multifunctional use is realized, the downhole tool string can be lowered alone or used with drilling, the downhole tool string can be used to realize the scraping and cleaning operation of two different specifications of casings by lowering the tool string only once, the tool design is in line with the operation sequence from bottom to top in one-time scraping operation in the field, and the tool is suitable for the conventional scraping operation in the field, the connecting rod type retractable blade has a larger scraping range, the problems of small extension range of the conventional slider type blade and spring type blade are solved, the blade can realize the extension amount from 7in to 9.625in, the structure can ensure the integrity of the connecting rod structure during the lowering of the pipe string, the complete circulation channel is established, the circulation washing channel can be ensured during use, the ball throwing does not affect the establishment of the washing circulation of the tool, the debris can be discharged in time, and the use safety and use efficiency of the tool are ensured, the two groups of split blades are 360 degrees circumferentially covered, the pipe wall cleaning is ensured without dead angle, and the debris after cleaning can be discharged with the washing liquid. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view structural schematic diagram of the utility model;

[0014] Figure 2 It is a 7in tail pipe scraping operation schematic diagram of the utility model;

[0015] Figure 3 It is a 9.625in casing scraping operation schematic diagram of the utility model;

[0016] Figure 4 It is Figure 3Enlarged view at A;

[0017] Figure 5 The utility model is a top view structure schematic diagram;

[0018] Figure 6 The utility model is a structure schematic diagram;

[0019] Figure 7 The utility model is a scraper blade structure schematic diagram. DETAILED DESCRIPTION

[0020] In order to make the utility model purposes, technical scheme and advantages more clearly, following combining with the drawings and example, the utility model is further detailedly explained.It should be understood that the specific example described here is only used to explain the utility model, and is not used to limit the utility model.

[0021] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not used to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as the limitation of the utility model.In addition, in the description of the utility model, the meaning of "multiple" is two or more than two, unless there is a clear specific limitation.

[0022] Please refer to Figures 1-7 For example, the scraping and washing of the 9.625in casing 18 matched with the 7in tail pipe 17 well structure.

[0023] As Figure 2 Shown, the scraper body 1 is lowered to the 7in tail pipe 17 scraping and washing area, and the scraper blade 3 on the scraper body 1 directly acts on the well wall to carry out scraping and washing operation.

[0024] As Figure 5 And Figure 6 Shown, the scraper body 1 has two groups of scraper blades 3 installed alternately up and down, and each group contains three scraper blades 3, which can cover the 360 ° circumferential range, ensuring that the pipe wall is cleaned without dead angle.

[0025] The scraper blade 3 and the scraper body 1 are connected by three groups of connecting rods, from top to bottom, connecting rod one 4, connecting rod two 5 and connecting rod three 6, and the three groups of connecting rods are connected with the scraper body 1 through connecting pin 7;

[0026] Among them, as Figure 6 And Figure 7As shown, connecting rod 1 4 and connecting rod 2 5 are fixed on the scraper body 1 and can rotate. Connecting rod 3 6 is installed on the guide groove 011 on the scraper body 1 and can slide up and down along the guide groove 011. Each scraper blade 3 has two guide grooves 011 on both sides of the scraper body 1 to realize the extension and retraction of the scraper blade 3.

[0027] After the 7-inch tailpipe section 17 is scraped and cleaned, the tubing string is lifted to prepare for the 9.625-inch sleeve section 18 scraping and cleaning operation.

[0028] Steel ball 15 is inserted from the top of the tubing and pressurized. Steel ball 15 flows down along the inner channel of the tool to the bottom of the shearing cylinder 14. At this time, the tool begins to pressurize. When the pressure reaches 15MPa, the shearing pin 13 is cut off, and steel ball 15 and shearing cylinder 14 slide down into the bottom of the extension mandrel 12.

[0029] At this time, the downward fluid is blocked and can only flow out through the flow channel hole 141 on the shear cylinder 14, flow through the inner hole of the lower connector 16, and enter the casing to achieve circulation and well washing. At the same time, the flow channel hole 121 on the extension mandrel 12 is also open. Part of the fluid throttled by the steel ball 15 enters the annulus between the extension mandrel 12 and the scraper body 1, and acts on the bottom of the piston 10.

[0030] The formation of the throttling pressure differential compresses the spring 11, pushing the piston 10 upward. Furthermore, the push block 8, fixed to the piston 10 by the fixing screw 9, also moves upward. The connecting pin 7 of the fixing rod 3 6 moves upward in the guide groove 011. Therefore, the scraper blade 3 is pushed outward, acting on the well wall for scraping. The state of the scraper blade after opening is as follows: Figure 3 As shown.

[0031] Scraping both sizes of casing requires only one run of the tubing string, and can also be used for cleaning a single size tubing string. A single ball drop is enough to open the scraper blades, without affecting fluid circulation and well washing operations, ensuring that debris is effectively carried to the surface.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic ball-throwing type pipe scraper, characterized in that: The device includes a scraper body, on which two sets of scraper blades are installed alternately, with each set of blades evenly distributed around the circumference of the scraper body. Connecting rod 1, connecting rod 2, and connecting rod 3 are sequentially arranged from top to bottom on the inner side of each scraper blade, and connecting rod 1, connecting rod 2, and connecting rod 3 are connected to the scraper body via connecting pins. The scraper body has multiple guide grooves, and the ends of connecting rod 1 and connecting rod 2 are fixed to the scraper body, while the end of connecting rod 3 is installed within the guide groove of the scraper body.

2. The hydraulic ball-throwing type pipe scraper according to claim 1, characterized in that: The scraper body has a central flow channel inside, and from top to bottom, the scraper body has a mandrel, a piston, an extension mandrel, a shearing cylinder and a lower connector arranged in sequence. The piston is fitted on the mandrel, the extension mandrel is sleeved with the mandrel, and the shearing cylinder is connected to the extension mandrel through a shearing pin.

3. A hydraulic ball-throwing type pipe scraper according to claim 2, characterized in that: A spring is fitted on the lower outer side of the piston, and the spring is located between the piston and the scraper body.

4. A hydraulic ball-throwing type pipe scraper according to claim 2, characterized in that: A push block is mounted on the piston by fixing screws, and the push block is located on the lower side of the guide groove.

5. A hydraulic ball-throwing type pipe scraper according to claim 2, characterized in that: The extension mandrel has a flow channel hole one, and the shearing cylinder has a flow channel hole two.

6. A hydraulic ball-throwing type pipe scraper according to claim 1, characterized in that: Each set of scraper blades includes 3 scraper blades, and each scraper blade has guide grooves on both sides.

Images