Static conductive device for glass fiber reinforced plastic three-phase separator

Abstract

The static conductive device comprises the glass fiber reinforced plastic three-phase separator, carbon fiber cloth is laid on the inner wall of the glass fiber reinforced plastic three-phase separator at intervals, the outer wall of the glass fiber reinforced plastic three-phase separator is connected with a metal flange, and a static conductive metal rod penetrates through the center of the metal flange. The first end of the static conductive metal bar is connected with the carbon fiber cloth connector, and the second end of the static conductive metal bar is connected with the grounding bar through a wire. According to the static conductive device for the glass fiber reinforced plastic three-phase separator, the problem that the risk of combustion explosion of an oil-gas medium is sharply increased due to the fact that accumulated static cannot be conducted out in time along with prolonging of service time, reduction of conductivity or oxidation of the surface of a copper wire in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of three-phase separation containers for oil fields, specifically relating to an electrostatic discharge device for fiberglass three-phase separators. Background Technology

[0002] Fiberglass reinforced plastic (FRP) is a composite material made from thermosetting resins (such as epoxy resin, unsaturated polyester resin, vinyl ester resin, etc.) as the matrix material and glass fiber and its products (glass fiber chopped strand mat, glass fiber edge mat, glass fiber untwisted roving, etc.) as the reinforcing material. FRP materials have advantages such as excellent corrosion resistance, low scaling, high specific strength, strong design flexibility, and easy molding, and can replace traditional carbon steel materials in the manufacture of three-phase separators for oilfields. The FRP three-phase separator is a new type of composite material pressure separation vessel, mainly used for the efficient and safe separation of oil, water, and gas produced fluids in oilfield stations. Because the shell and internal separation components are all made of FRP, compared with traditional carbon steel three-phase separators, its corrosion resistance to oil, water, and gas media is significantly improved, effectively reducing the risk of leakage of oil, water, and gas media, and its service life can reach more than 20 years. With the increasing corrosiveness of produced fluids in domestic oilfields, major oilfields have accelerated the construction and application of fiberglass three-phase separators in recent years, resulting in a year-on-year increase in the use of this product in oilfields, which fully guarantees the efficient and safe development of oil and gas resources.

[0003] The internal components of a fiberglass three-phase separator contain flammable and explosive oil and gas media under pressure, making their safety a primary concern. Fiberglass itself has extremely poor electrostatic conductivity, easily leading to the accumulation of static electricity. This accumulated static electricity can easily cause combustion and explosion of the internal media, resulting in oil and gas leaks and personal injury. Therefore, timely discharge of static electricity generated within the fiberglass three-phase separator is crucial. Currently, there are two main methods for discharging static electricity from the inside of fiberglass three-phase separators: One method involves adding conductive fillers (carbon black, graphite powder, carbon fiber powder, carbon nanotubes, metal powder) to the resin-rich layer on the inner surface of the container to increase the overall conductivity of the inner wall, and then connecting the inner wall to the ground via wires to discharge static electricity. The other method involves embedding interconnected copper wires in the circumferential and axial resin-rich layers on the inner surface to form a conductive network, which is then connected to the ground to achieve static electricity discharge.

[0004] However, while adding conductive fillers can improve the conductivity of the entire resin-rich layer and effectively prevent static electricity accumulation, the long-term contact between the inner surface layer and the high-temperature oil, water, and gas media inevitably causes resin swelling, leading to the slow precipitation of the conductive fillers. When the conductive fillers cannot form an effective conductive path, the conductivity of the inner surface will gradually decrease until the accumulated static electricity cannot be discharged in time, drastically increasing the risk of combustion and explosion in the oil and gas media. While embedding a copper wire network in the inner surface resin-rich layer avoids the problem of conductive filler precipitation, the presence of corrosive substances such as carbon dioxide, hydrogen sulfide, and chloride ions in the oil, water, and gas media corrodes the copper wires. In particular, the combined effect of moisture and oxygen penetrating the resin easily leads to oxidation and the formation of copper rust on the copper wire surface, significantly reducing the conductivity of the entire copper wire network and failing to effectively discharge accumulated static electricity, posing a certain safety risk. Therefore, for fiberglass three-phase separators used in oil fields, it is necessary to develop new methods for discharging static electricity in a timely manner while maintaining good stability in oil, water, and gas media. Summary of the Invention

[0005] The purpose of this invention is to provide a static discharge device for fiberglass three-phase separators, which solves the problem that with the extension of use time, the conductivity decreases or the copper wire surface oxidizes, making it impossible to discharge the accumulated static electricity in a timely manner, which leads to a sharp increase in the risk of combustion and explosion of oil and gas media.

[0006] The technical solution adopted in this invention is: a static dissipation device for a fiberglass three-phase separator, comprising a fiberglass three-phase separator, carbon fiber cloth being laid at intervals on the inner wall of the fiberglass three-phase separator, a metal flange being connected to the outer wall of the fiberglass three-phase separator, a static dissipation metal rod penetrating through the center of the metal flange, the first end of the static dissipation metal rod being connected to a joint of the carbon fiber cloth, and the second end of the static dissipation metal rod being connected to a grounding rod through a wire.

[0007] The invention is further characterized by:

[0008] Carbon fiber cloth is laid evenly and at intervals in the circumferential and axial directions of the fiberglass three-phase separator. The overlap width of each ring of carbon fiber cloth is 100mm to 400mm, and the distance between adjacent carbon fiber cloths is 0.5m to 1.2m. When laying, it is necessary to avoid the bonding position of the internal components. In the areas where the carbon fiber cloth overlaps and intersects, resin adhesive needs to be applied layer by layer to ensure a tight fit between each layer.

[0009] Carbon fiber cloth is made of small tows of carbon fiber, with tow specifications of 1K, 3K, 6K, 12K, and 24K. The thickness of the carbon fiber cloth ranges from 0.11mm to 0.48mm, and the width ranges from 100mm to 400mm. The resistivity is ≤10 Ω·cm. -3 Ω·m.

[0010] Before installing the internal components of the fiberglass three-phase separator, carbon fiber cloth is pre-laid on the inner wall of the container. First, the laying position on the inner wall is determined and pre-treated. The surface is roughened by sanding with sandpaper, and the sanding width is 1.5 to 2 times the width of the carbon fiber cloth. Then, vinyl ester resin or epoxy resin adhesive is brushed onto the sanded area. The carbon fiber cloth is laid on the resin-coated position and compacted. After the resin cures, the carbon fiber cloth can be fixed to the inner wall surface. The carbon fiber cloth closest to the conductive rod is laid last, leaving a certain length. The reserved carbon fiber is tightly wrapped around the conductive metal rod, and resin adhesive is applied to the surface of the wrapped carbon fiber cloth for curing.

[0011] The conductive metal rod, metal flange, and grounding rod are all made of the same material. Optional materials include 304 stainless steel, 316L stainless steel, 625 nickel-based alloy, or 825 nickel-based alloy.

[0012] The diameter of the conductive metal rod and the grounding rod is 8mm to 15mm, and the inner diameter of the metal flange is 50 to 300mm.

[0013] The beneficial effects of this invention are:

[0014] This invention provides a device for discharging static electricity in a fiberglass three-phase separator. Carbon fiber cloth is laid circumferentially and axially on the inner wall of the separator, interconnecting to form a continuous conductive network structure. This conductive network, through metal rods and wires installed on the separator shell, can promptly discharge static electricity generated inside the separator to the ground, eliminating safety hazards in the fiberglass three-phase separator and effectively ensuring its safety. Compared with methods such as coating with conductive filler resin and embedding copper wire networks, using carbon fiber cloth effectively improves the corrosion resistance of the conductive network and eliminates the risk of filler precipitation, greatly enhancing reliability and stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the carbon fiber conductive electrostatic device installed inside the three-phase separator of the present invention.

[0016] In the diagram, 1. Fiberglass three-phase separator, 2. Carbon fiber cloth, 3. Metal flange, 4. Electrostatic conductive metal rod, 5. Wire, 6. Grounding rod. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] Electrostatic discharge devices for fiberglass three-phase separators, such as Figure 1As shown, the device includes a fiberglass three-phase separator 1. Carbon fiber cloth 2 is spaced along the inner wall of the fiberglass three-phase separator 1. The carbon fiber cloth 2 is made of small tow carbon fibers, with tow specifications of 1K, 3K, 6K, 12K, and 24K. The thickness of the carbon fiber cloth 2 is 0.11mm to 0.48mm, the width is 100mm to 400mm, and the resistivity is ≤10. -3 Ω·m, the outer wall of the fiberglass three-phase separator 1 is welded with a metal flange 3, and a static-dissipating metal rod 4 runs through the center of the metal flange 3. The first end of the static-dissipating metal rod 4 is connected to the joint of the carbon fiber cloth 2, and the second end of the static-dissipating metal rod 4 is connected to the grounding rod 6 through the wire 5. The static-dissipating metal rod 4, the metal flange 3, and the grounding rod 6 are all made of the same material. The optional materials include 304 stainless steel, 316L stainless steel, 625 nickel-based alloy or 825 nickel-based alloy. The diameter of the static-dissipating metal rod 4 and the grounding rod 6 is 8mm to 15mm, and the inner diameter of the metal flange 3 is 50 to 300mm.

[0019] Specifically, carbon fiber cloth 2 is laid evenly and at intervals in the circumferential and axial (i.e., transverse and longitudinal) directions of the fiberglass three-phase separator 1. The carbon fiber cloth needs to be laid in both the circumferential and axial directions inside the separator. The circumferential laying area is between the container body and the end caps at both ends, and the axial laying area is between the body and the end caps at both ends. The overlap width of each ring of carbon fiber cloth 2 is 100mm to 400mm, and the distance between adjacent carbon fiber cloth 2 is 0.5m to 1.2m. When laying, it is necessary to avoid the bonding positions of internal components. In the areas where carbon fiber cloth 2 overlaps and intersects, resin adhesive needs to be applied layer by layer to ensure a tight fit between each layer.

[0020] Before installing the internal components of the fiberglass three-phase separator 1, carbon fiber cloth 2 is pre-laid on the inner wall of the container. First, the laying position on the inner wall is determined and pre-treated. The surface is roughened by sanding with sandpaper. The sanding width is 1.5 to 2 times the width of the carbon fiber cloth. Then, vinyl ester resin or epoxy resin adhesive is brushed onto the sanded area. The carbon fiber cloth is laid on the resin-coated position and compacted. After the resin cures, the carbon fiber cloth can be fixed to the inner wall surface. The carbon fiber cloth closest to the conductive rod is laid last. A certain length is reserved during laying. The reserved carbon fiber is tightly wrapped around the conductive metal rod 4, and resin adhesive is applied to the surface of the wrapped carbon fiber cloth for curing.

[0021] The working principle is as follows: When static electricity is generated on the inner wall of the container, the static electricity can be transmitted to the static-conducting metal rod 4 through the conductive network of carbon fiber cloth 2. Since the static-conducting metal rod 4 is connected to the grounding rod 6 through the wire 5, the static electricity is conducted into the ground, realizing the effective release of accumulated static electricity.

[0022] The carbon fiber used in the static dissipation device of this invention is a novel material with excellent electrical conductivity. Carbon fiber cloth woven from carbon fiber exhibits excellent conductivity, high mechanical strength, and remarkable stability in oil, water, and gas media. By attaching the highly conductive carbon fiber cloth to the inner surface of a fiberglass three-phase separator and laying it in multiple circumferential and axial directions, interconnecting them, a stable conductive network of carbon fiber cloth can be formed. This conductive network can be connected to the ground via metal rods and wires, promptly dissipating static electricity accumulated on the inner wall of the container, completely eliminating safety hazards in the fiberglass three-phase separator, and effectively ensuring the safe operation of the separator.

[0023] Example 1

[0024] Taking the installation of an anti-static device on a fiberglass three-phase separator with an inner diameter of 3m and a length of 15m as an example, the carbon fiber cloth uses 12K fiber bundles, with a thickness of 0.167mm, a width of 200mm, and a resistivity ≤10. -3 The static discharge rod, flange, and grounding rod are all made of 316L stainless steel. The diameter of the static discharge metal rod and the grounding rod is 10mm. The inner diameter of the metal flange is the same as the inner diameter of the flange on the container wall, which is 150mm.

[0025] Before installation, first determine the laying position of the carbon fiber cloth. When laying it circumferentially, the distance between each carbon fiber cloth is 0.8m; when laying it axially, the distance between each carbon fiber cloth is 1m. Grind the bonding surface at the circumferential and axial laying positions on the cylinder body to create a 300mm wide surface. Clean the ground surface and wipe it with acetone. After the acetone evaporates, mix the vinyl ester resin and hardener evenly and apply it to the ground surface. Then, adhere the carbon fiber cloth to the inner wall of the container and compact it. The overlap width of the carbon fiber cloth should be 300mm. In areas where the carbon fibers overlap, apply a layer of vinyl ester resin adhesive to the bottom of the overlapping area.

[0026] A certain length of carbon fiber is reserved where the conductive metal rod extends into the container. The reserved carbon fiber is wound around the conductive metal rod and coated with vinyl ester adhesive. After all the adhesives have cured at room temperature, the carbon fiber conductive network is complete. The conductive metal rod must pass through the flange face, and the part passing through the flange is fixed by welding. The other end is connected to a grounding rod through a copper wire. The grounding rod is then inserted into the ground to complete the installation of the static discharge device.

[0027] Example 2

[0028] Taking the installation of an electrostatic discharge device on a fiberglass three-phase separator with an inner diameter of 2.5m and a length of 10m as an example. The carbon fiber cloth uses 24K fiber bundles, with a thickness of 0.111mm, a width of 150mm, and a resistivity ≤10. -3Ω·m. The conductive rod, flange, and grounding rod are all made of 304 stainless steel. The diameter of the conductive metal rod and the grounding rod is 8mm. The inner diameter of the metal flange is the same as the inner diameter of the flange on the container wall, which is 100mm.

[0029] Before installing the internal components, the carbon fiber fabric is laid. First, the position of the carbon fiber cloth is determined. When laying it circumferentially and axially, the distance between adjacent carbon fiber cloths in both directions is 0.8m. A 230mm wide bonding surface is sanded out at the pre-determined laying position. The sanded surface is cleaned and wiped with acetone. After the acetone evaporates, epoxy resin and room temperature curing agent are mixed evenly and applied to the sanded area. The carbon fiber cloth is then adhered and compacted. The overlap width of the carbon fiber cloth is 250mm. Epoxy resin adhesive is applied to the overlapping areas of the carbon fiber.

[0030] The pre-reserved carbon fiber is wound onto the conductive metal rod and coated with epoxy resin for curing. After curing, a conductive carbon fiber network is formed. The conductive metal rod passes through the flange and is welded. The exposed portion is connected to a grounding rod via a copper wire. The grounding rod is then inserted into the ground, completing the installation of the static discharge device.

[0031] Example 3

[0032] Taking the installation of an anti-static device on a fiberglass three-phase separator with an inner diameter of 3m and a length of 15m as an example, the carbon fiber cloth uses 6K fiber bundles, with a thickness of 0.48mm, a width of 400mm, and a resistivity ≤10. -3 The static discharge rod, flange, and grounding rod are all made of 625 nickel-based alloy. The diameter of the static discharge metal rod and the grounding rod is 15mm. The inner diameter of the metal flange is the same as the inner diameter of the flange on the container wall, which is 150mm.

[0033] Before installation, first mark the laying positions of the carbon fiber cloth. When laying it circumferentially, the distance between each carbon fiber cloth is 0.5m; when laying it axially, the distance between each carbon fiber cloth is 0.8m. Grind the bonding surfaces at the circumferential and axial laying positions on the cylinder to create a 600mm wide surface. Clean the ground surface and wipe it with acetone. After the acetone evaporates, mix the vinyl ester resin and hardener evenly and apply it to the ground surface. Then, adhere the carbon fiber cloth to the inner wall of the container and compact it. The overlap width of the carbon fiber cloth should be 400mm. In areas where the carbon fibers overlap, apply a layer of vinyl ester resin adhesive to the bottom layer of the overlapping area.

[0034] A certain length of carbon fiber is reserved where the conductive metal rod extends into the container. The reserved carbon fiber is wound around the conductive metal rod and coated with vinyl ester adhesive. After all the adhesives have cured at room temperature, the carbon fiber conductive network is complete. The conductive metal rod must pass through the flange face, and the part passing through the flange is fixed by welding. The other end is connected to a grounding rod through a copper wire. The grounding rod is then inserted into the ground to complete the installation of the static discharge device.

Claims

1. A static dissipation device for a fiberglass three-phase separator, characterized in that, The system includes a fiberglass three-phase separator (1), on which carbon fiber cloth (2) is laid at intervals on the inner wall. A metal flange (3) is connected to the outer wall of the fiberglass three-phase separator (1). A static-dissipating metal rod (4) passes through the center of the metal flange (3). The first end of the static-dissipating metal rod (4) is connected to the joint of the carbon fiber cloth (2), and the second end of the static-dissipating metal rod (4) is connected to a grounding rod (6) through a wire (5).

2. The electrostatic discharge device for a fiberglass three-phase separator according to claim 1, characterized in that, The carbon fiber cloth (2) is laid evenly and at intervals in the circumferential and axial directions of the fiberglass three-phase separator (1). The overlap width of each loop of the carbon fiber cloth (2) is 100mm to 400mm, and the distance between adjacent carbon fiber cloths (2) is 0.5m to 1.2m. When laying, the bonding positions of the internal components should be avoided. In the areas where the carbon fiber cloth (2) overlaps and intersects, resin adhesive needs to be applied layer by layer to ensure a tight fit between each layer.

3. The electrostatic discharge device for a fiberglass three-phase separator according to claim 2, characterized in that, The carbon fiber cloth (2) is made of small tow carbon fiber, the specifications of which are 1K, 3K, 6K, 12K, and 24K. The thickness of the carbon fiber cloth (2) is 0.11mm to 0.48mm, the width of which is 100mm to 400mm, and the resistivity is ≤10. -3 Ω·m.

4. The electrostatic discharge device for a fiberglass three-phase separator according to claim 2, characterized in that, Before installing the internal components of the fiberglass three-phase separator (1), carbon fiber cloth (2) is laid on the inner wall of the container. First, the laying position on the inner wall is determined and pre-treated. The surface is roughened by sanding with sandpaper. The sanding width is 1.5 to 2 times the width of the carbon fiber cloth. Then, vinyl ester resin or epoxy resin adhesive is brushed on the sanded area. The carbon fiber cloth is laid on the resin-coated position and compacted. After the resin is cured, the carbon fiber cloth can be fixed to the inner wall surface. The carbon fiber cloth closest to the electrostatic rod is laid last. A certain length is reserved during laying. The reserved carbon fiber is tightly wrapped around the electrostatic metal rod (4) and the resin adhesive is brushed onto the surface of the wrapped carbon fiber cloth for curing.

5. The electrostatic discharge device for a fiberglass three-phase separator according to claim 1, characterized in that, The conductive metal rod (4), metal flange (3), and grounding rod (6) are all made of the same material, and the optional materials include 304 stainless steel, 316L stainless steel, 625 nickel-based alloy or 825 nickel-based alloy.

6. The electrostatic discharge device for a fiberglass three-phase separator according to claim 4, characterized in that, The diameter of the electrostatic conductive metal rod (4) and the grounding rod (6) is 8mm to 15mm, and the inner diameter of the metal flange (3) is 50 to 300mm.

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