CN102817037B - Oil gas pipeline potential measurement permanent reference electrode - Google Patents

Abstract

The invention relates to a permanent reference electrode for measuring the potential of an oil and gas pipeline. An insulating screw (6) is arranged at the top of an insulating sleeve (3), a red copper bar electrode (2) is sealed on the insulating screw (6), and the external thread of the insulating screw (6) is matched and sealed with the internal thread of the insulating sleeve (3); the high molecular conductive polymer (1) is fixed at the central part of the bottom of the insulating sleeve (3); saturated copper sulfate solution (4) is contained in the insulating sleeve (3); completely sealing a reference saturated copper sulfate solution (4), a red copper bar electrode (2) and an electrode lead (7) through a high-molecular conductive polymer (1), an insulating sleeve (3), an insulating screw (6), a heat-shrinkable sleeve (5) and a hot melt adhesive (8); the macromolecule conducting polymer (1) ensures the conduction of the saturated copper sulfate solution (4) and an external medium and can measure the potential; the problems of solution leakage, semipermeable membrane blockage and copper bar corrosion do not exist, so that the long-term service life of the reference electrode is ensured.

Description

A Permanent Reference Electrode for Potential Measurement of Oil and Gas Pipeline

technical field

The invention relates to a permanent reference electrode for oil and gas pipeline potential measurement. General areas of corrosion protection and piping technology involving metallic materials.

Background technique

At present, most oil and gas pipeline cathodic protection potential measurement reference electrodes use microporous ceramic semi-permeable membranes for the conduction of the internal and external electrolytes of the reference electrodes. Because the solvent is allowed to pass through after a period of time under the action of osmosis, the solution of the reference electrode will inevitably lead to Leakage and even semi-permeable membrane blockage, pollution and electrode oxidation and eventually failure, although the dual-chamber structure and packing can alleviate this problem and prolong the service life of the reference electrode, but it cannot fundamentally solve this problem.

CN101915794A discloses an all-solid-state reference electrode based on thick film printing technology, including a substrate, an electrode base system, an electrolyte layer, a reference film and an insulating layer. CN101308111A discloses a hot-dip coated silver/silver halide reference electrode and a preparation method thereof. The reference electrode is composed of silver and silver halide refractory salt. These two reference electrodes solve this problem in aqueous environments, but are not ideal in soil environments either.

Contents of the invention

The purpose of the present invention is to invent a permanent reference electrode for potential measurement of oil and gas pipelines with long service life, which avoids the permeation loss of the reference electrode solution, the plugging of the semipermeable membrane and the corrosion of the electrode.

In order to overcome the above problems, the present invention provides a permanent reference electrode for potential measurement of oil and gas pipelines, which uses an ion-conductive high-molecular conductive polymer, which can conduct the electrolyte measurement inside and outside the reference electrode to the oil and gas pipeline without water penetration. The cathodic protection potential can avoid the leakage of the reference electrode solution, the blockage and pollution of the semipermeable membrane, and the oxidation of the electrode, ensuring the long-term effectiveness of the reference electrode.

The present invention consists of high molecular conductive polymer 1, red copper rod electrode 2, insulating sleeve 3, saturated copper sulfate solution 4, heat shrinkable sleeve 5, insulating screw 6, electrode lead wire 7 and hot melt adhesive 8.

The insulating screw 6 is installed on the top of the insulating sleeve 3, the copper rod electrode 2 is sealed on the insulating screw 6, and the external thread of the insulating screw 6 matches and seals the internal thread of the insulating sleeve 3; the conductive polymer 1 is fixed on the insulating sleeve The center part of the bottom of the cylinder 3; the insulating sleeve 3 is filled with a saturated copper sulfate solution 4; the reference is saturated through the high molecular conductive polymer 1, the insulating sleeve 3, the insulating screw 6, the heat shrinkable sleeve 5 and the hot melt adhesive 8 The copper sulfate solution 4, the red copper rod electrode 2 and the electrode lead wire 7 are completely sealed, and the high molecular conductive polymer 1 ensures the conduction between the saturated copper sulfate solution 4 and the external soil and other media and can measure the potential; because there is no solution leakage, Semi-permeable membrane clogging and copper rod corrosion problems ensure the long life of the reference electrode.

The high-molecular conductive polymer 1 is an ion-conductive type, and it has various types and preparation methods. It has commercialized finished products at home and abroad. The present invention selects an ion-conductive polymer of the same material as a flexible anode for cathodic protection of pipelines as a high-density polymer. Molecular conductive polymer 1 is used to prepare a reference electrode, or a water-impermeable ceramic or nano-ceramic prepared by a solid electrolyte composed of a metal oxide is used to prepare a reference electrode;

The insulating sleeve 3 is a cylinder with an internal thread on the top;

The insulating screw 6 is a ring piece with an external thread and a hole in the center.

The core of preparing a permanent reference electrode for potential measurement of oil and gas pipelines is to use a water-impermeable solid ion-conducting material as the electrolyte conducting part. This part is not limited to ion-conducting polymers, and metal oxides Water-impermeable ceramic or nano-ceramic prepared by solid electrolyte; the type of permanent reference electrode for oil and gas pipeline potential measurement is not limited to copper/copper sulfate saturated solution reference electrode, and is also applicable to other types of reference for oil and gas pipeline potential measurement electrode.

The reference electrode of the present invention can remove the electrode lead wire 7 as a portable permanent reference electrode for oil and gas pipeline potential measurement, and can also use ion-conductive polymer conductive polymers to prepare oil and gas pipeline potential measurement. Electrolyte conduction material for other single-chamber, multi-chamber reference electrodes or polarized probes.

The invention relates to a permanent reference electrode for potential measurement of oil and gas pipelines, relates to oil and gas pipelines and stations, and is suitable for detection and long-term monitoring of cathodic protection potential.

The permanent reference electrode for potential measurement of oil and gas pipelines avoids the seepage loss of the reference electrode solution, the blockage of the semi-permeable membrane and the corrosion of the electrode, and ensures the long-term life of the reference electrode.

Description of drawings

Figure 1 Composition of permanent reference electrode for potential measurement of oil and gas pipelines

Among them 1-polymer conductive polymer 2-copper rod electrode

3-insulation sleeve 4-saturated copper sulfate solution

5-Heat shrink sleeve 6-Insulation screw

7-Electrode Leads 8-Hot Melt Adhesive

Detailed ways

Embodiment. The specific embodiment of the present invention is described with this example and the present invention is described further. This example is an experimental prototype, the composition of which is shown in Figure 1.

This example consists of polymer conductive polymer 1, copper rod electrode 2, insulating sleeve 3, saturated copper sulfate solution 4, heat shrinkable sleeve 5, insulating screw 6, electrode lead wire 7, and hot melt adhesive 8.

The insulating screw 6 is installed on the top of the insulating sleeve 3, the copper rod electrode 2 is sealed on the insulating screw 6, and the external thread of the insulating screw 6 matches and seals the internal thread of the insulating sleeve 3; the conductive polymer 1 is fixed on the insulating sleeve The center part of the bottom of the cylinder 3; the insulating sleeve 3 is filled with a saturated copper sulfate solution 4; the reference is saturated through the high molecular conductive polymer 1, the insulating sleeve 3, the insulating screw 6, the heat shrinkable sleeve 5 and the hot melt adhesive 8 The copper sulfate solution 4 and the red copper rod electrode 2 are completely sealed, and the high molecular conductive polymer 1 ensures the conduction between the saturated copper sulfate solution 4 and the external soil and other media and the potential can be measured; due to the absence of solution leakage and semipermeable membrane blockage And copper rod corrosion problems, to ensure the long-term life of the reference electrode.

in:

The high molecular conductive polymer 1 is ion-conductive, and a certain imported conductive polymer material is used, and a columnar conductive polymer with a length of 1 cm and a diameter of 8 mm is used as the high molecular conductive polymer 1 to prepare a reference electrode;

The insulating sleeve 3 is a cylinder with an internal thread on the top; a drum with a diameter of 100mm and a height of 120mm is made of polyvinyl chloride, the wall thickness of the barrel is 3mm, and the top M80mm;

The insulating screw 6 is a ring piece with an M80mm thread on the outside and a Φ10mm hole in the center;

The copper rod electrode 2 is a Φ10×130mm copper rod.

After testing in this example, the permanent reference electrode for potential measurement of oil and gas pipelines avoids the seepage loss of the reference electrode solution, the blockage of the semipermeable membrane and the corrosion of the electrode, and the service life of the reference electrode is long.

Claims (4)

1. A permanent reference electrode for potential measurement of oil and gas pipelines is characterized in that it consists of a polymer conductive polymer (1), a red copper rod electrode (2), an insulating sleeve (3), a saturated copper sulfate solution (4), a thermal Consists of shrink sleeve (5), insulating screw (6), electrode lead wire (7), and hot melt adhesive (8); The insulating screw (6) is installed on the top of the insulating sleeve (3), the copper rod electrode (2) is sealed on the insulating screw (6), and the external thread of the insulating screw (6) matches the internal thread of the insulating sleeve (3) Sealing; the impermeable high molecular conductive polymer (1) is fixed on the bottom center of the insulating sleeve (3); the insulating sleeve (3) is filled with a saturated copper sulfate solution (4); through the high molecular conductive polymer (1), insulating sleeve (3), insulating screw (6), heat shrink sleeve (5) and hot melt adhesive (8) will refer to saturated copper sulfate solution (4) and red copper rod electrode (2) and electrode lead (7) Completely sealed. 2. The permanent reference electrode for potential measurement of a kind of oil and gas pipeline according to claim 1, characterized in that the polymer conducting polymer (1) is an ion-conducting polymer conducting polymer, and the ion-conducting polymer is used as the high-molecular conducting polymer. The molecular conductive polymer (1) is used to prepare a reference electrode. 3. A permanent reference electrode for oil and gas pipeline potential measurement according to claim 1, characterized in that the insulating sleeve (3) is a cylinder with an internal thread on the top. 4. The permanent reference electrode for potential measurement of oil and gas pipelines according to claim 1, characterized in that the insulating screw (6) is a ring piece with an external thread and a hole in the center.