Outer pipe wall mud scraping device

Abstract

The utility model relates to the technical field of decontamination equipment, in particular to an outer pipe wall mud scraping device which mainly comprises a mud scraping lining, an outer shell and a base, the outer shell is arranged on the upper portion of the base, one side of the mud scraping lining is provided with a mud outlet groove, and the other side of the mud scraping lining is provided with a mud outlet. When the mud scraping bush is used, the mud scraping bush is arranged on the outer pipe wall of the perforating gun in a sleeving mode, after the perforating gun is normally used, the degree of freedom of the mud scraping bush in the vertical direction is limited, the mud scraping bush and the mud scraping bush can move relatively, and in the process that the perforating gun is taken out, the mud scraping bush can be conveniently taken out. The mud scraping lining can scrape mud on the outer pipe wall of the perforating gun, the mud flows to the outside through the mud outlet groove and the mud outlet holes, the mud removing operation of the perforating gun is completed, and therefore the perforating gun can be kept relatively clean when taken out.

Description

Technical Field

[0001] The utility model relates to the technical field of decontamination equipment, in particular to an outer pipe wall scraper. Background Art

[0002] In well completion or cementing operations, perforating guns are often used. Perforating guns are tools used to open the connecting channel between the casing and the formation underground to achieve fracturing or exploitation of oil and gas in the formation. It is usually composed of tubular perforator mechanical parts and perforating bullets. The perforating bullets are carried by the mechanical parts to the designated position, detonated, and high-temperature and high-pressure jets are generated to form holes of a certain size and depth in the casing and the formation.

[0003] The perforating gun needs to be taken out of the ground after perforating. After perforating in some wells, thick mud will adhere to the surface of the gun body, and the surface mud may cause danger, so there is an urgent need for a device that can scrape the mud off the outer wall of the perforating gun. Utility Model Content

[0004] The utility model aims to provide an outer pipe wall mud scraping device to solve the problem in the prior art that after some wells are perforated with a perforating gun, thick mud will adhere to the surface of the gun body.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] An outer pipe wall scraper device comprises a scraper bushing, an outer shell and a base, wherein the outer shell is arranged on the upper part of the base, a matching cavity is arranged inside the outer shell, a protrusion is arranged at the bottom of the scraper bushing, and the scraper bushing is connected with the matching cavity of the outer shell by embedding through the protrusion;

[0007] A mud outlet groove is arranged on one side of the mud scraper bushing, and a plurality of mud outlet holes are arranged around a circle of the outer shell.

[0008] In an embodiment of the utility model, the mud outlet groove is spirally arranged from the top of the mud scraper bushing to the bottom of the mud scraper bushing.

[0009] In one embodiment of the utility model, the scraper bushing, the outer shell and the base are all provided with through holes, the through holes are used to place the perforating gun, and the scraper bushing, the outer shell and the base are coaxially arranged.

[0010] In one embodiment of the present invention, a connecting device for connecting to a wellhead is provided at the bottom of the base.

[0011] In one embodiment of the utility model, the connecting device includes a nut and a lifting ring, circular holes are respectively opened on both sides of the bottom of the base, one end of the lifting ring is provided with a thread and passes through the circular hole, and the nut is connected to the end of the lifting ring provided with the thread.

[0012] In an embodiment of the present invention, a gap is provided between the mud bushing and the outer shell.

[0013] In an embodiment of the present utility model, an inner side of the bottom of the outer shell is provided with an internal thread, and a top of the base is provided with an external thread, and the outer shell is threadedly connected to the base.

[0014] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0015] The structure of the utility model mainly includes a scraper bushing, an outer shell and a base. The outer shell is arranged on the upper part of the base. A mud outlet groove is arranged on one side of the scraper bushing. A plurality of mud outlet holes are arranged around the outer shell. When in use, the scraper bushing is sleeved on the outer tube wall of the perforating gun. After the normal use of the perforating gun is completed, the freedom of the scraper bushing in the vertical direction is limited so that the two can maintain relative movement. In the process of taking out the perforating gun, the scraper bushing can scrape the mud on the outer tube wall of the perforating gun, and the mud flows to the outside through the mud outlet groove and the mud outlet hole, completing the mud removal operation of the perforating gun, so that the perforating gun can be kept relatively clean when it is taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 It is a top view of the utility model.

[0020] Icon: 1-scraper bushing, 2-mud outlet groove, 3-outer shell, 4-mud outlet hole, 5-base, 6-nut, 7-lifting ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Please refer to Figure 1-Figure 3 , an outer pipe wall scraper device, comprising a scraper bushing 1, an outer shell 3 and a base 5, the outer shell 3 is arranged on the upper part of the base 5, a matching cavity is arranged inside the outer shell 3, a protrusion is arranged at the bottom of the scraper bushing 1, and the scraper bushing 1 is inlaid and connected with the matching cavity of the outer shell 3 through the protrusion;

[0023] A mud outlet groove 2 is provided on one side of the mud scraper bushing 1 , and a plurality of mud outlet holes 4 are provided around a periphery of the outer shell 3 .

[0024] In this embodiment, the scraper bushing 1 is made of engineering plastic or rubber, such as nylon or PTFE, HNBR, etc., and its inner diameter is designed to be consistent with the outer diameter of the barrel. The outer shell 3 is used to fix the internal plastic scraper bushing 1, and the material is metal. The mud outlet hole 4 is used to prevent the mud flowing out of the mud outlet groove 2 from accumulating.

[0025] The structure of the utility model mainly includes a scraper bushing 1, an outer shell 3 and a base 5. The outer shell 3 is arranged on the upper part of the base 5. A mud outlet groove 2 is arranged on one side of the scraper bushing 1, and a plurality of mud outlet holes 4 are arranged around the outer shell 3. When in use, the scraper bushing 1 is sleeved on the outer tube wall of the perforating gun. After the normal use of the perforating gun is completed, the freedom of the scraper bushing 1 in the vertical direction is limited so that the two can maintain relative movement. In the process of taking out the perforating gun, the scraper bushing 1 can scrape the mud on the outer tube wall of the perforating gun, and the mud flows to the outside through the mud outlet groove 2 and the mud outlet hole 4, completing the mud removal operation of the perforating gun, so that the perforating gun can be kept relatively clean when it is taken out.

[0026] In this embodiment, the mud outlet groove 2 is spirally arranged from the top of the mud scraper bushing 1 to the bottom of the mud scraper bushing 1, so as to scrape mud at more angles.

[0027] Secondly, the scraper bushing 1, the outer shell 3 and the base 5 are all provided with through holes, and the through holes are used to place the perforating gun. The scraper bushing 1, the outer shell 3 and the base 5 are coaxially arranged.

[0028] In this embodiment, a connection device for connecting to a wellhead is provided at the bottom of the base 5. The connection device includes a nut 6 and a lifting ring 7. Round holes are respectively provided on both sides of the bottom of the base 5. One end of the lifting ring 7 is provided with a thread and passes through the round hole. The nut 6 is connected to the end of the lifting ring 7 provided with the thread.

[0029] When in use, two steel ropes can be used to pass through the lifting ring 7 respectively, and the two ends of the steel ropes can be fixed at the wellhead to limit the vertical movement of the base 5. In this way, the scraper device can move left and right with the perforating gun, and when scraping mud is needed, the two can achieve relative movement in the vertical direction.

[0030] Secondly, a gap is provided between the mud bushing and the outer shell 3, so that there is a certain expansion space when the barrel deforms and expands.

[0031] In this embodiment, an internal thread is provided on the inner side of the bottom of the outer shell 3, and an external thread is provided on the top of the base 5. The outer shell 3 is threadedly connected to the base 5, which is convenient for installation and disassembly.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An outer pipe wall scraper device, characterized in that: The invention comprises a scraper bushing (1), an outer shell (3) and a base (5), wherein the outer shell (3) is arranged on the upper part of the base (5), a matching cavity is arranged inside the outer shell (3), a protrusion is arranged at the bottom of the scraper bushing (1), and the scraper bushing (1) is connected to the matching cavity of the outer shell (3) by embedding through the protrusion; A mud outlet groove (2) is provided on one side of the mud scraping bushing (1), and a plurality of mud outlet holes (4) are provided around a periphery of the outer shell (3).

2. The outer pipe wall scraping device according to claim 1, characterized in that: The mud outlet groove (2) is spirally arranged from the top of the mud scraper bushing (1) to the bottom of the mud scraper bushing (1).

3. The outer pipe wall scraping device according to claim 1, characterized in that: The scraper bushing (1), the outer shell (3) and the base (5) are all provided with through holes, and the through holes are used to place a perforating gun. The scraper bushing (1), the outer shell (3) and the base (5) are coaxially arranged.

4. The outer pipe wall scraping device according to claim 1, characterized in that: The bottom of the base (5) is provided with a connecting device for connecting to a wellhead.

5. The outer pipe wall scraping device according to claim 4, characterized in that: The connecting device comprises a nut (6) and a lifting ring (7), circular holes are respectively provided on both sides of the bottom of the base (5), one end of the lifting ring (7) is provided with a thread and passes through the circular hole, and the nut (6) is connected to the end of the lifting ring (7) provided with the thread.

6. The outer pipe wall scraping device according to claim 1, characterized in that: A gap is provided between the mud bushing and the outer shell (3).

7. The outer pipe wall scraping device according to claim 1, characterized in that: An internal thread is provided on the inner side of the bottom of the outer shell (3), an external thread is provided on the top of the base (5), and the outer shell (3) is threadedly connected to the base (5).

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