Grounding tool and method for detecting outer anticorrosive coating of pipeline under complex earth surface condition

Abstract

The invention discloses a grounding tool and method for detecting an outer anticorrosive coating of a pipeline under a complex earth surface condition. The grounding tool comprises a bottom end, a body, a funnel and a handheld end, the bottom end is installed at one end of the body, the handheld end is installed at the other end of the body, the funnel is installed on the body, the bottom end is arranged to be of a semicircular angled wedge-shaped structure, the interior of the body is of a hollow structure, and a plurality of kidney-shaped holes are formed in the body. The grounding device is simple in structure and convenient to operate, can adapt to a complex ground surface environment, can realize reliable grounding in a high-resistance ground surface environment, and ensures smooth detection.

Description

Technical Field

[0001] The invention belongs to the field of surface gathering and transportation of oil and gas fields, and in particular to a grounding tool and method for detecting an outer anti-corrosion layer of a pipeline under complex surface conditions. Background Art

[0002] Due to the diverse laying environments, most of the oil and gas field gathering and transportation pipelines are subject to corrosion by corrosive media. In order to ensure the reliable operation of the pipeline, most of the existing pipelines are prefabricated in the factory for external anti-corrosion before laying. During the operation of the pipeline, the integrity of the outer surface anti-corrosion layer is an important guarantee to ensure that the pipeline is not corroded. Therefore, in the daily operation and maintenance of the pipeline, it is necessary to regularly inspect the anti-corrosion layer to assess whether it has potential safety risks and provide detailed information for further avoiding operation risks. Most of the pipelines used in oil and gas field gathering and transportation have been treated with anti-corrosion. After a period of operation, it is necessary to evaluate the anti-corrosion effect of the anti-corrosion layer so as to take further effective measures. In the implementation of the existing detection method, PCM (multi-frequency pipe current detector) uses the method of loading current on the pipeline body, and then manually holds the terminal to detect whether there is an abnormality in the current signal. Since the surface of the place where the pipeline is laid is relatively complex and diverse, it is necessary to ground the fixed current loading device (transmitter) to ensure that the equipment can work normally. The current grounding tools are relatively simple, and the grounding is too dependent on surface factors such as soil moisture, and poor contact is prone to occur during use, and the grounding needs to be readjusted. Affects the continuity of detection and the authenticity of data. Authorization Announcement No.: CN213278422U, a grounding steel bar for PCM detection of the outer anti-corrosion layer of buried pipelines. The invention decomposes the grounding steel bar into several sections by threaded connection, which has the advantage of easy transportation, and the bottom is designed as a pointed structure, with a reserved conductive medium seepage channel. However, the tool is not able to adapt to complex surfaces. Under more complex surface conditions, it will have to use hammering. Due to the prominent randomness of the hammering force, the thread will fail after a long period of use, so that the tool cannot be used normally. Authorization Announcement No.: CN208817104U, a buried gas pipeline PCM detection grounding device, which can transmit uniform striking force to the grounding tool and strike to the required depth. It is characterized by using a motor to convert electrical energy into uniform reciprocating striking force, which can save labor intensity. However, the invention still uses the method of hammering the grounding tip into the soil to achieve grounding, which cannot adapt to complex surface environments and cannot keep the buried tip wet with conductive media. Authorization announcement number: CN207559090U, a grounding electrode device for PCM inspection of buried pipelines. The invention sets the grounding electrode as a main grounding electrode and an auxiliary grounding electrode. Such a design can further improve the reliability of grounding. At the same time, the design adopts a rotating main grounding electrode to achieve the main grounding electrode drilling into the soil. However, the invention is still not adaptable to complex surface environments and lacks effective response functions for high-resistance surface environments. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a grounding tool and method for detecting the external anti-corrosion layer of pipelines under complex surface conditions, so as to solve the problem that it is difficult to achieve reliable grounding and ensure the normal operation of equipment under complex surface conditions.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions, comprising a body and a funnel;

[0006] A bottom end is installed at the bottom of the body, a handheld end is installed at the top of the body, the funnel is installed on the body, the bottom end is set as a semicircular angled wedge structure, the interior of the body is a hollow structure, and a plurality of waist-shaped holes are set on the body.

[0007] Furthermore, the material of the bottom end is alloy steel, and the hardness of the bottom end is ≥45HRC.

[0008] Furthermore, the taper angle of the ground-entering end of the bottom is 10°, and the taper angle of the ground-lifting end of the bottom is 5°.

[0009] Furthermore, one end of the body is connected to the handheld end by assembly welding, and a retaining ring is arranged between the other end of the body and the bottom end by assembly welding, and a liquid outlet hole is opened in the retaining ring.

[0010] Furthermore, the body is a steel pipe, and a plurality of waist-shaped holes are arranged at intervals in a spiral shape on the circumference of the body toward one end.

[0011] Furthermore, the funnel is connected to the body by assembly welding, a medium inlet is welded on the body, and the medium inlet is arranged inside the funnel.

[0012] Furthermore, the funnel is made of steel plate, and a plurality of connecting terminals are evenly arranged on the edge of the funnel.

[0013] Furthermore, the handheld end is a solid rod, one end of the handheld end is provided with a blind hole, and the blind hole is connected to the inner hollow of the body.

[0014] Furthermore, a drainage-aiding hole is provided on the handheld end, and the drainage-aiding hole is vertically connected to the blind hole.

[0015] A grounding method for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions using the grounding tool includes:

[0016] When testing in complex terrain or places with high resistivity, use the bottom end of a semicircular wedge-shaped structure with an angle to take soil. After reaching a certain depth, hammer the handheld end to fix the bottom end in the soil.

[0017] Pour the NaCL solution into the funnel. After the NaCL solution penetrates into the ground through the hollow structure of the main body, pour the NaCL solution again to fill the funnel. Connect the ground wire of the transmitter of the detection equipment through the terminal on the funnel for detection.

[0018] After the inspection is completed, remove the wiring cables and pull the bottom out of the ground. After cleaning, prepare for the next location inspection.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions. A semicircular angled wedge structure is arranged at the bottom of the hollow body, and a handheld end is arranged at the top. In places with complex terrain and high resistivity, the grounding tool can be fixed in the soil by hammering the handheld end after the soil is taken to a certain depth by utilizing the special structure at the bottom. A funnel is arranged on the body, and a number of waist-shaped holes are provided, so that the conductive medium in the funnel can penetrate into the surface smoothly and quickly, improve the conductivity, keep the pointed objects in the soil soaked in the conductive medium, and make the detection results more accurate. The funnel is filled with the conductive medium, and the grounding wire of the transmitter of the detection equipment is connected through the wiring terminal arranged on the edge of the funnel, so that the grounding tool becomes a conductive whole, thereby realizing detection in a complex environment. The present invention has a simple structure, is easy to operate, can adapt to complex surface environments, can achieve reliable grounding in high-resistance surface environments, and ensures smooth detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to the present invention.

[0023] Among them: 1-bottom end, 2-main body, 3-funnel, 4-hand-held end. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0031] See also Figure 1 The present invention provides a grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions, comprising a bottom end 1, a main body 2, a funnel 3 and a handheld end 4.

[0032] The bottom end 1 is set as a semicircular angled wedge structure. The material of the bottom end 1 is alloy steel, and the hardness of the bottom end 1 is ≥45HRC. The taper angle of the ground-entering end of the bottom end 1 is 10°, and the taper angle of the ground-leaving end is 5°. It is easy to take soil in complex terrain or places with high resistivity, and it is convenient to fix the bottom end 1 on the ground. The body 2 is a steel pipe, and the bottom end 1 is connected to the body 2 by welding.

[0033] A retaining ring is provided at the lower part of the body 2 by group welding, and the body 2 is connected to the bottom end 1 through the retaining ring. A liquid outlet is provided in the middle of the retaining ring, and the conductive medium flows out from the liquid outlet, which improves the resistivity of complex terrain or places with high resistivity. The interior of the body 2 is a hollow structure, which facilitates the conductive medium to flow from the funnel 3 to the ground. A plurality of waist-shaped holes are provided on the body 2, and the plurality of waist-shaped holes are distributed in a spiral shape along the length direction on the circumference of the body 2 to meet the seepage of the conductive medium.

[0034] The upper end of the body 2 is connected to the handheld end 4 by welding. The handheld end 4 is a solid rod. The bottom end 1 can be fixed in the soil by hammering the handheld end 4. A blind hole is provided at one end of the handheld end 4, and the blind hole is connected to the inner hollow of the body 2. The handheld end 4 is also provided with a drainage hole, which is vertically connected to the blind hole, so as to help the conductive medium in the hollow structure of the body 2 to flow quickly to the ground.

[0035] The funnel 3 is mounted on the body 2, and is connected to the body 2 by welding, and can hold a certain amount of conductive medium. A medium inlet is welded on the body 2, and the medium inlet is arranged inside the funnel 3, and the conductive medium in the funnel 3 enters the hollow structure of the body 2 through the medium inlet. The material of the funnel 3 is a steel plate, and a number of wiring terminals are evenly arranged on the edge of the funnel 3. The conductive medium in the funnel 3 can be connected to the ground wire of the transmitter of the detection equipment through the wiring terminals, so that the detection of the outer anti-corrosion layer of the pipeline can be carried out smoothly.

[0036] The grounding method for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions of the present invention:

[0037] When testing in complex terrain or places with high resistivity, the bottom end 1 of the semicircular wedge-shaped structure with an angle is used to take soil. After reaching a certain depth, the handheld end 4 is hammered to fix the bottom end 1 in the soil.

[0038] After hammering, pour NaCL solution (3% to 10%) into the funnel 3. After the NaCL solution penetrates into the ground through the hollow structure of the body 2, pour the NaCL solution again to fill the funnel 3. Then connect the ground wire of the transmitter of the detection equipment through the terminal on the funnel 3 for detection.

[0039] When the inspection is completed, remove the wiring cables and pull the bottom end 1 out of the ground. After cleaning, prepare for the next location for inspection.

[0040] Embodiment 1:

[0041] This embodiment provides a grounding tool for detecting the outer anti-corrosion layer of pipelines under complex surface conditions. The main body 2 of the tool is a φ25mm steel pipe with a wall thickness of 3mm and a total length of 650mm. The body 2 is processed with a φ1mm waist-shaped hole 25.5mm from the bottom, and the hole length is 15mm. The waist-shaped holes are distributed to the top at a distance of 100mm from the body 2 along the circumference at 90°. The waist-shaped holes processed in the steel pipe body 2 can meet the seepage of conductive media. The body 2 is processed with a φ5mm medium inlet 62.5mm away from the top.

[0042] The funnel 3 is installed on the upper part of the body 2 by group welding, and can hold a certain amount of conductive medium. The large circle diameter of the funnel 3 is φ165mm, and the small circle diameter is φ25mm. The funnel 3 is 95mm high, the funnel angle is 60°, the thickness is 2mm, and it is made of steel plate. The medium inlet is welded inside the funnel 3. There are 4 wiring terminals evenly distributed at 90° on the large circle edge of the funnel 3. The conductive medium can be connected to the ground wire of the transmitter of the detection equipment through the wiring terminals.

[0043] The lower part of the body 2 is provided with a retaining ring by group welding, and the body 2 is connected to the bottom end 1 through the retaining ring, and a φ3mm liquid outlet hole is opened in the middle of the retaining ring. The bottom end 1 is set as a semicircular angled wedge structure with a total length of 62mm. The taper angle of the bottom end 1 entering the ground is 10°, and the taper angle of the ground end is 5°. The material of the bottom end 1 is alloy steel, and the quenching treatment is performed to ensure that the hardness is ≥45HRC.

[0044] The top of the body 2 is connected to a handheld end 4 by group welding. The handheld end 4 is a φ25mm solid rod. The bottom end 1 can be inserted into the ground by hammering the handheld end 4. A φ3mm blind hole is opened at one end of the handheld end 4. A φ3mm drainage hole is processed at 29mm from the top surface and is vertically connected to the blind hole.

[0045] 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 have 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. A grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions, characterized in that: It comprises a body (2) and a funnel (3); The bottom of the body (2) is provided with a bottom end (1), the top of the body (2) is provided with a handheld end (4), the funnel (3) is installed on the body (2), the bottom end (1) is arranged as a semicircular angled wedge structure, the interior of the body (2) is a hollow structure, and a plurality of waist-shaped holes are arranged on the body (2).

2. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The material of the bottom end (1) is alloy steel, and the hardness of the bottom end (1) is ≥45HRC.

3. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The taper angle of the ground-entering end of the bottom end (1) is 10°, and the taper angle of the ground-leaning end of the bottom end (1) is 5°.

4. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: One end of the body (2) is connected to the handheld end (4) by means of assembly welding, and a retaining ring is provided between the other end of the body (2) and the bottom end (1) by means of assembly welding, wherein a liquid outlet hole is provided in the retaining ring.

5. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The body (2) is a steel pipe, and a plurality of waist-shaped holes are arranged at intervals in a spiral shape on the circumference of the body (2) toward one end.

6. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The funnel (3) is connected to the body (2) by means of assembly welding, a medium inlet is welded on the body (2), and the medium inlet is arranged inside the funnel (3).

7. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The funnel (3) is made of a steel plate, and a plurality of connection terminals are evenly arranged on the edge of the funnel (3).

8. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The handheld end (4) is a solid rod, and one end of the handheld end (4) is provided with a blind hole, which is connected to the inner hollow of the body (2).

9. The grounding tool for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions according to claim 1 is characterized in that: The handheld end (4) is provided with a drainage-aiding hole, and the drainage-aiding hole is vertically connected to the blind hole.

10. A grounding method for detecting the outer anti-corrosion layer of a pipeline under complex surface conditions using the grounding tool as claimed in any one of claims 1 to 9, characterized in that: include: When testing in a complex terrain or a place with high resistivity, the bottom end (1) of the semicircular wedge-shaped structure with an angle is used to take soil, and after reaching a certain depth, the handheld end (4) is hammered to fix the bottom end (1) in the soil; Pour the NaCL solution into the funnel (3), wait for the NaCL solution to penetrate into the ground through the hollow structure of the body (2), then pour the NaCL solution again to fill the funnel (3), and connect the ground wire of the transmitter of the detection equipment through the terminal on the funnel (3) for detection; After the inspection is completed, the wiring cables are removed and the bottom end (1) is pulled out of the ground. The cleaning is completed and the next inspection location is prepared.

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