Non-polarized electrode

Abstract

The utility model provides a non-polarized electrode, which relates to the technical field of oil field exploration tools, and is characterized in that a protective knot is arranged at the part, extending into an electrode cylinder, of a wire, and when the wire is subjected to external tension, the protective knot can be tensioned, so that the wire is prevented from directly pulling a soft anode wire in the electrode to damage the electrode when being subjected to the external tension, and the service life of the electrode is prolonged. The technical problems that in the prior art, when the exposed wire is pulled by external force, the joint of the anode wire and the wire is prone to being damaged, and stable use of the electrode cannot be guaranteed are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield exploration tools, in particular to a non-polarizable electrode. Background Art

[0002] With the continuous deepening of oilfield exploration, the proportion of low-permeability oil and gas reservoirs in newly discovered reserves has increased significantly, and more than half of the exploration reserves are low-permeability oil reservoirs. Fracturing technology is the key to the effective development of such reserves. Accurately grasping the geometric morphology and extension of hydraulic fracturing cracks is of great significance for evaluating the fracturing effect, testing and improving the accuracy of fracturing design, and thus improving the production capacity of single wells. Geopotential method fracture monitoring can better reflect the extension direction of hydraulic fractures. In the application of electromagnetic methods in fracturing monitoring and oilfield development monitoring, it is necessary to detect subtle changes in deep underground fracturing fluid or oil and gas targets. However, as the forefront of data acquisition in electromagnetic exploration, the performance of electric field sensors is the most important. In actual geoelectric field measurement, the most commonly used electric field sensor is the electrode. The stability and consistency of the electrode have a particularly large impact on the monitoring effect. The electrode range deviation can often reach the millivolt level, which is larger than the anomaly caused by the change of the monitoring target. Therefore, low self-noise and high stability electrodes are urgent problems to be solved in electromagnetic monitoring. Since metal electrodes will inevitably polarize during use, long-term stable observation is difficult to carry out, so the main electrodes used currently are non-polarizable electrodes formed by the reaction of metals and metal salt solutions.

[0003] At present, the non-polarizable electrodes on the market mainly include Cu-CuSO4 electrode, Pb-PbCl2 electrode and Ag-AgCl electrode. Among them, the most commonly used is Pb-PbCl2 non-polarizable electrode, which is suitable for most observations of earth electric field signals. The measurement of Pb-PbCl2 non-polarizable electrode generally needs to be buried in the soil. During the electrode layout process, the electrode wire must be exposed outside. The exposure of the wire will inevitably cause pulling. When the electrode wire is pulled by external force, the connection between the anode wire and the wire may be damaged. If the connection between the wire and the anode wire is not fixed, the contact is poor or broken, it will cause huge measurement deviation and measurement noise, and the stable use of the electrode cannot be guaranteed. The general solution is to train or instruct the electrode users not to pull the non-polarizable electrode wire. However, it is still difficult to avoid various factors pulling the wire during the use of the electrode. Utility Model Content

[0004] The utility model aims to provide a non-polarized electrode to alleviate the technical problem in the prior art that when the exposed wire is pulled by external force, the connection between the anode wire and the wire is easily damaged, and the stable use of the electrode cannot be guaranteed.

[0005] The non-polarizable electrode provided by the utility model comprises: a conducting wire, an electrode tube and an anode wire;

[0006] Electrolyte slurry is placed in the inner cavity of the electrode cylinder;

[0007] One end of the wire extends into the electrode cylinder, and the other end of the wire is placed outside the electrode cylinder and connected to a testing instrument;

[0008] The anode wire is arranged in the electrode cylinder, one end of the anode wire is connected to the lead wire, and the other end of the anode wire is placed in the electrolyte slurry;

[0009] The portion of the wire extending into the electrode cylinder is provided with a protective knot, and the protective knot is used to prevent the wire from pulling the anode wire when the wire is subjected to external tension.

[0010] In an alternative embodiment,

[0011] The non-polarizable electrode further comprises a fixing cap;

[0012] The fixing cap blocks the top opening of the electrode cylinder;

[0013] The fixing cap has a through hole, and the wire passes through the through hole.

[0014] In an alternative embodiment,

[0015] The non-polarizable electrode further comprises a protective sleeve;

[0016] The protective cover is arranged in the through hole, the wire passes through the protective cover, and the protective cover is used to prevent the wire from being bent at the top position of the fixing cap.

[0017] In an alternative embodiment,

[0018] The top of the fixing cap is recessed to form a fixing groove, the bottom of the fixing groove is communicated with the through hole, and the protective cover is arranged in the fixing groove.

[0019] In an alternative embodiment,

[0020] Sealant is arranged in the protective cover.

[0021] In an alternative embodiment,

[0022] A separator is provided in the electrode cylinder, the separator is located in the electrolyte slurry, and the separator is used to separate the electrolyte slurry into an upper slurry area and a lower slurry area;

[0023] The partition plate has a liquid passage to connect the upper slurry area with the lower slurry area.

[0024] In an alternative embodiment,

[0025] The partition plate is provided with a liquid passing hole, and the liquid passing channel is formed in the liquid passing hole.

[0026] In an alternative embodiment,

[0027] The non-polarizable electrode also includes a piece of Paulownia wood;

[0028] The Paulownia wood piece blocks the bottom opening of the electrode cylinder.

[0029] In an alternative embodiment,

[0030] The bottom end of the electrode cylinder extends inward to form a support portion, the paulownia wood piece is arranged on the support portion, and the support portion is used to support the paulownia wood piece.

[0031] In an alternative embodiment,

[0032] The fixing cap and the electrode cylinder are both made of polypropylene and are integrally formed by 3D printing.

[0033] The non-polarized electrode provided by the utility model has a protective knot arranged at the portion where the wire extends into the electrode tube. When the wire is subjected to external tension, the protective knot can be tightened, thereby preventing the wire from directly pulling the soft anode wire inside the electrode when subjected to the external tension, thereby preventing the electrode from being damaged. This alleviates the technical problem in the prior art that when the wire exposed to the outside is pulled by external force, the connection between the anode wire and the wire is easily damaged, thereby failing to ensure stable use of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the overall structure of a non-polarizable electrode provided in an embodiment of the utility model;

[0036] Figure 2 A schematic diagram of the connection structure of the wire, protective sleeve, fixing cap, protective junction and anode wire in the non-polarizable electrode provided in an embodiment of the utility model.

[0037] Icon: 1- conductor; 2- protective cover; 3- fixing cap; 4- protective knot; 5- electrode tube; 6- anode wire; 7- electrolyte slurry; 8- separator; 9- Paulownia wood piece. DETAILED DESCRIPTION

[0038] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 communication 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.

[0041] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0042] like Figure 1 , Figure 2 As shown, the non-polarizable electrode provided in this embodiment includes: a conductor 1, an electrode tube 5 and an anode wire 6.

[0043] Electrolyte slurry 7 is placed in the inner cavity of the electrode tube 5 ; one end of the wire 1 extends into the electrode tube 5 , and the other end of the wire 1 is placed outside the electrode tube 5 and connected to a test instrument. The wire 1 is specifically a copper wire 1 .

[0044] The anode wire 6 is disposed in the electrode cylinder 5 , one end of the anode wire 6 is connected to the lead 1 , and the other end of the anode wire 6 is placed in the electrolyte slurry 7 . The anode wire 6 is specifically a lead wire.

[0045] The portion of the wire 1 extending into the electrode tube 5 is provided with a protective knot 4, and the protective knot 4 is used to prevent the wire 1 from pulling the anode wire 6 when the wire 1 is subjected to external tension.

[0046] The preparation process of the anti-pull protection knot 4 is as follows:

[0047] (a) Connect the anode wire 6 and the conductor wire 1 together by welding.

[0048] (b) The high temperature during welding in step (a) will cause the insulating sheath of the wire 1 near the welding point to soften in a short period of time, during which time a knot is quickly tied at the end of the wire 1.

[0049] (c) The knot in step (b) is punched at a position 2 to 5 mm away from the welding point in step (a), and the anti-pull protection knot 4 is formed after the insulation sheath of the wire 1 cools down.

[0050] In an optional embodiment, the fixing cap 3 and the electrode tube 5 are both made of polypropylene and are integrally formed by 3D printing.

[0051] The non-polarized electrode provided in the present embodiment is provided with a protective knot 4 at the portion of the wire 1 extending into the electrode tube 5. When the wire 1 is subjected to external tension, the protective knot 4 can be tightened, thereby preventing the wire 1 from directly pulling the soft anode wire 6 inside the electrode when subjected to external tension, thereby preventing the electrode from being damaged. This alleviates the technical problem in the prior art that when the exposed wire 1 is pulled by external force, the connection between the anode wire 6 and the wire 1 is easily damaged, thereby failing to ensure stable use of the electrode.

[0052] On the basis of the above embodiment, in an optional implementation manner, the non-polarizable electrode provided in this embodiment further includes a fixing cap 3 ; the fixing cap 3 blocks the top opening of the electrode tube 5 ; the fixing cap 3 has a through hole, and the wire 1 passes through the through hole.

[0053] Specifically, the fixing cap 3 includes a brim and a cylinder that are connected to each other. The top of the cylinder is connected to the bottom of the brim. The outer diameter of the brim is larger than the opening size of the electrode tube 5, so it can be sealed on the opening of the electrode tube 5. The outer diameter of the cylinder is smaller than the opening size of the electrode tube 5. The cylinder extends into the electrode tube 5 to stably seal the fixing cap 3 at the top opening of the electrode tube 5.

[0054] A through hole is provided in the middle of the brim to provide passage for the wire 1 so that the wire 1 can pass through the fixing cap 3 . One end of the wire 1 is placed outside the electrode tube 5 , while the other end of the wire 1 is placed inside the electrode tube 5 .

[0055] In an optional embodiment, the non-polarizable electrode further includes a protective cover 2 ; the protective cover 2 is disposed in the perforation, the wire 1 passes through the protective cover 2 , and the protective cover 2 is used to prevent the wire 1 from bending at the top position of the fixing cap 3 .

[0056] Specifically, a fixing groove is formed in the top of the brim of the fixing cap 3, the bottom of the fixing groove is connected to the through hole, and the protective cover 2 is arranged in the fixing groove. Even if the external wire 1 is bent, the fixing cap 3 and the wire 1 will not be subjected to a large friction force, thereby protecting the wire 1 from being damaged.

[0057] The wire 1 is led out from the upper part of the fixing sleeve, and then put into the protective sleeve 2, and the protective sleeve 2 is filled with sealant to seal.

[0058] In an optional embodiment, a separator 8 is provided in the electrode tube 5. The separator 8 is located in the electrolyte slurry 7. The separator 8 is used to separate the electrolyte slurry 7 into an upper slurry area and a lower slurry area. The separator 8 has a liquid passage.

[0059] Specifically, a liquid hole is provided on the partition plate 8, and a liquid channel is formed in the liquid hole to connect the upper slurry area with the lower slurry area. The electrolyte slurry 7 prepared in advance is placed in the electrode tube 5, and it is confirmed that the electrolyte slurry 7 completely fills the inner cavity of the electrode tube 5. The partition plate 8 is used to separate the upper and lower layers of electrolyte, thereby extending the service life and avoiding the local excessive concentration change of the electrolyte slurry 7, thereby maintaining the long-term stability of the electrolyte slurry 7.

[0060] The partition plate 8 is specifically a circular plate with a circular hole. The partition plate 8 is fixed on the inner wall of the electrode tube 5. The circular hole is a liquid hole. The partition plate 8 and the electrode tube 5 can be an integral structure. When the electrode tube 5 is formed, the partition plate 8 is inside the electrode tube 5.

[0061] In addition, the specific preparation process of electrolyte slurry 7 is as follows:

[0062] (a) Preparation of conductive particle solution: 100 g of PbCl2, 0.5 g of HCl, 1 kg of NaCl and 1 kg of water were added to a stirring tank and mixed at a speed of 600 r / min to obtain a stable uniform electrolyte solution.

[0063] (b) 0.5 kg of kaolin was gradually added to the solution in step (a), and stirring was continued for 24 h at a rotation speed of 200 r / min. Finally, a uniform colloid was obtained, which was electrolyte slurry 7.

[0064] In an optional embodiment, the non-polarizable electrode further includes a Paulownia wood piece 9 ; the Paulownia wood piece 9 blocks the bottom opening of the electrode tube 5 .

[0065] Specifically, the bottom end of the electrode tube 5 extends inward to form a support portion, forming an annular support edge, and the Paulownia wood piece 9 is arranged on the support portion. The support portion supports the Paulownia wood piece 9, and the internal electrolyte slurry 7 contacts the outside through the Paulownia wood piece 9.

[0066] The non-polarizable electrode provided in this embodiment has the following beneficial effects:

[0067] 1. A protective cover 2 is designed. When the external wire 1 is bent or pulled, the protective cover 2 can reduce the friction between the wire 1 and the fixing cap 3, thereby protecting the integrity of the wire 1 and ensuring high-precision measurement of the non-polarized electrode.

[0068] 2. A new anti-pull protection knot 4 is designed to prevent the wire 1 from directly pulling the soft anode wire 6 inside the electrode when subjected to external tension, thereby damaging the electrode.

[0069] 3. The internal anti-pull protection knot 4 design can eliminate the measurement error caused by the internal structure damage of the electrode, improve the stability of the non-polarized electrode, and at the same time ensure the high precision of the non-polarized electrode, and the use effect is better.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A non-polarizable electrode, characterized in that: include: Conductor (1), electrode cylinder (5) and anode wire (6); An electrolyte slurry (7) is placed in the inner cavity of the electrode cylinder (5); One end of the wire (1) extends into the electrode tube (5), and the other end of the wire (1) is placed outside the electrode tube (5) and connected to a testing instrument; The anode wire (6) is arranged in the electrode cylinder (5), one end of the anode wire (6) is connected to the lead wire (1), and the other end of the anode wire (6) is placed in the electrolyte slurry (7); The portion of the wire (1) extending into the electrode cylinder (5) is provided with a protective knot (4), and the protective knot (4) is used to prevent the wire (1) from pulling the anode wire (6) when the wire (1) is subjected to external tension.

2. The non-polarizable electrode according to claim 1, characterized in that: The non-polarizable electrode further comprises a fixing cap (3); The fixing cap (3) blocks the top opening of the electrode cylinder (5); The fixing cap (3) has a through hole, and the wire (1) passes through the through hole.

3. The non-polarizable electrode according to claim 2, characterized in that: The non-polarizable electrode further comprises a protective cover (2); The protective cover (2) is arranged in the through hole, the wire (1) passes through the protective cover (2), and the protective cover (2) is used to prevent the wire (1) from being bent at the top position of the fixing cap (3).

4. The non-polarizable electrode according to claim 3, characterized in that: The top of the fixing cap (3) is recessed to form a fixing groove, the bottom of the fixing groove is connected to the through hole, and the protective cover (2) is arranged in the fixing groove.

5. The non-polarizable electrode according to claim 3, characterized in that: Sealant is provided inside the protective sleeve (2).

6. The non-polarizable electrode according to claim 1, characterized in that: A separator (8) is arranged in the electrode cylinder (5), the separator (8) is located in the electrolyte slurry (7), and the separator (8) is used to separate the electrolyte slurry (7) into an upper slurry area and a lower slurry area; The partition plate (8) has a liquid passage to connect the upper slurry area with the lower slurry area.

7. The non-polarizable electrode according to claim 6, characterized in that: The partition plate (8) is provided with a liquid passing hole, and the liquid passing channel is formed in the liquid passing hole.

8. The non-polarizable electrode according to claim 1, characterized in that: The non-polarizable electrode further comprises a Paulownia wood sheet (9); The Paulownia wood sheet (9) blocks the bottom opening of the electrode cylinder (5).

9. The non-polarizable electrode according to claim 8, characterized in that: The bottom end of the electrode cylinder (5) extends inwardly to form a support portion, and the paulownia wood piece (9) is arranged on the support portion, and the support portion is used to support the paulownia wood piece (9).

10. The non-polarizable electrode according to claim 3, characterized in that: The fixing cap (3) and the electrode cylinder (5) are both made of polypropylene and are integrally formed by 3D printing.

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