JPS603389A - Conduit for supporting electrode for electrical heating of hydrocarbon underground resources and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode supporting conduit for electric heating of hydrocarbon underground resources, and in particular to an electric insulating conduit used when extracting hydrocarbon underground resources by an electric heating method. The present invention relates to a heating electrode support conduit and a method for manufacturing the same.

In this specification, hydrocarbon underground resources refer to bitumen (Bi) contained in mail sand or cool sand.
tumen), and hereinafter referred to as oil sands unless otherwise specified.

In recent years, with the rise in the price of petroleum resources, extraction of oil from underground WM oil sand layers in countries such as Canada and Venezuela is being carried out in earnest. This oil sand layer is usually located several hundred meters underground and has a thickness of about SO
This oil sand exists in a layer of about 100 ft thick, but due to its high viscosity, it cannot be pumped up and collected at room temperature.
Conventionally, therefore, a method has been adopted in which heated steam is injected into the oil sand layer to raise the temperature of the oil, lower its viscosity, and then pump the oil. However, this method is inefficient and expensive, so as a more productive method, a pair of steel or stainless steel pipes with electrodes supported at the lower ends are connected to the oil sand layer. It is buried underground at a distance of approximately 3θ to 2θθm, and a voltage of several volts to several thousand volts is applied between both electrodes to raise the temperature of the oil sand layer using Joule heat. A method of extracting oil by lowering its viscosity was proposed.

In this latter oil extraction method, the resistivity of the oil sand layer is several times higher than that of the upper stratum, so the part of the conduit buried in the stratum is coated with an electrical insulator to prevent current from flowing through the upper stratum. You must do so. If it is not covered with an electrical insulator, the current will flow through the ground J*, and no current will flow between the electrodes buried in the oil sand layer. Accordingly, there is a rapidly increasing need to develop electrode support conduits encased in electrical insulators that can withstand use under these special conditions.

The characteristics that such an electrical insulator must possess are as follows: (a) It can withstand voltages of several volts to several thousand volts not only at room temperature but also at temperatures of about 0°C, which can reduce the viscosity of the oil in the oil sand layer. (1) Water contained in the oil sand layer must be heated to a temperature of approximately 300°C that can reduce the viscosity of the oil sand layer. (C) Mechanical strength that allows the electrode to be suspended, and when the electrode supported and suspended at the lower end of the conduit is buried in the oil sand layer through the buried hole, the hole wall The material must have sufficient mechanical impact strength to avoid damage when it comes into contact with the material.

etc. This invention was made to meet the above requirements.
An object of the present invention is to provide an electrode supporting conduit for electric heating of hydrocarbon underground resources that has excellent voltage resistance, heat resistance, and mechanical strength.

The present inventors have conducted extensive research to develop a 1U pole support conduit coated with an electrical insulator that has all of the characteristics (a) to (e) above, and have found that the outer peripheral surface of the metal conduit is A film of polyether ether ketone resin is wrapped around the outer periphery of the glass fiber impregnated with polyether sulfone resin (hereinafter referred to as PES) or polysulfone resin (hereinafter referred to as PSU). Pressing temperature 330-1130℃, pressure/θ ~ λθ
An electrical insulator that has all the properties of (a) to (e) above by melting and molding polyetheretherketone resin and PKs or PSU'i under the conditions of OK9/crrL2. It was discovered that it was possible to obtain an electrode supporting conduit coated with the following, and this invention was completed.

This invention provides an electrical insulator on the outer circumferential surface of a metal conduit, consisting of a plurality of alternating layers of polyneedleetherketone resin film layers molded under heat and pressure and glass fiber layers impregnated with polyethersulfone resin or polysulfone resin. An electrode support conduit for electric heating of hydrocarbon underground resources is characterized by the following.

This invention also provides a method in which a polyetheretherketone resin film and glass fibers impregnated with polyethersulfone resin or polysulfone resin are alternately wrapped multiple times around the outer circumferential surface of the metal conduit, and the outer circumference is heated at a temperature of 0. There is also a method for manufacturing an electrode supporting conduit for heating an underground hydrocarbon resource 1d, characterized by comprising an electrical insulator that is heated and pressed at 50° C. and a pressure of 10 to λθθρ.

Aromatic polyether ether ketone shell 1 developed by British company Inverial Chemical Industries has a thickness of 0, θ/~0. Su01
1! , preferably a film of o, q, 2, to 0.30 v ITA is used. In the case of a small film with a thickness of O0θ/Ayu, the film can be easily cut by the tension applied to the winding so that there are no gaps between the layers of the film or between the layers of the filter and the glass fiber.
The film cannot be wrapped around metal conduits. If the thickness of the filter is thicker than O, DaOw, the elastic repulsion force of the film is large and it is not possible to wrap the film layers in close contact with each other. Gaps are formed, and air bubbles are incorporated into the insulator during hot-press molding, making it impossible to obtain an insulator with excellent hot water resistance and electrical properties.

As the glass fiber, those having a shape that can be wound around a metal conduit, such as cloth, tape, roving, and mat, are used. Impregnated into glass fiber, I! PES with T1 is represented by the following chemical structural formula, (Product name: Victoresox PF, S, British Engineering C)
In addition, PSU is represented by the following chemical structural formula (
(Product name: Newdel P/7θθ, Ucc Co., USA) (Product name: Niastel 31-θ, 3M Co., USA) In order to impregnate glass fibers with these PES or P, S U:r, these are dissolved in a solvent and coated with varnish. used as As the solvent for the varnish, methylene chloride, dimethylpolamide, N-methyl-λ-pyrrolidone, cyclohexanone, trichloroethylene, 2-dichloroethane, toluene, xylene, methyl ethyl ketone, dioxane, etc. are appropriately selected and used.

As the metal conduit, it is preferable to use a steel pipe or a stainless steel pipe, which has excellent corrosion resistance and good electrical conductivity. The length of the conduit is determined depending on the depth of the underground oil sand layer, but is usually between 20θ and 00. Next, we will discuss the manufacturing process of the electrode support conduit. First, a metal conduit is impregnated with a polyetheretherketone resin film L1PLS or PSUno'7 varnish, and glass fibers with a PEB or PBH content of 2θ to 50% by weight are alternately wrapped around it. The surface is pressurized with a lo-20 μ♂ pressure using a mold and heated to a temperature of 350 to 1 Iso℃, and the polyether ether ketone resin and the above pps or PSU'E
An insulator can be formed by melting and integrating with glass fibers. When the heating melting temperature is lower than 35θ°C, the melt viscosity of the polyetheretherketone resin is high, and the bubbles inside the insulator cannot be removed, making it impossible to obtain an insulator with excellent hot water resistance and electrical properties. If the heating melting temperature is higher than qso°C, thermal deterioration of PEB or PSU impregnated with polyetheretherketone resin and glass R fiber will occur, and an insulator with excellent hot water resistance, mechanical properties, and electrical properties cannot be obtained. .

Instead of this invention, polyetheretherketone resin films and glass fibers are alternately wound around the outer peripheral surface of a metal conduit, the outer peripheral surface is pressed with a mold, and 350-da SO
When an insulator consisting of a composite material of polyether ether ketone resin and glass R fibers is formed by melting under heating and pressure at a temperature of 10°C and a pressure of 200 m2, the polyether ether ketone resin The glass fibers are not impregnated into the interior of the insulator, causing bubbles inside the insulator, making it impossible to obtain an insulator with excellent hot water resistance and electrical properties.

Furthermore, when polyamide, polycarbonate, polyethylene terephthalate, ABS, As, or polystyrene resin is used as the thermoplastic resin impregnated into the glass fibers, the insulator deteriorates due to hot water at 300"C, resulting in poor mechanical and electrical properties. It is not possible to obtain an excellent insulator.

However, polyetheretherketone resin films and glass fibers impregnated with PBS or PSU, which are hot water-resistant thermoplastic resins, are alternately wrapped around the outer circumferential surface of the metal conduit.
What is the insulator according to this invention whose outer peripheral surface is held in a mold and heated and press-molded at a predetermined temperature and pressure? 3.There are no air bubbles inside the rim, and it can withstand a hot water test at 3θo℃, and is used for electrical heating of oil sand layers. T is suitable as an electrical insulator for pole support conduits.

Next, the actual #U embodiment of the electrode support conduit coated with an electrical insulator of the present invention will be described with reference to the drawings. Figure 1 shows the lower end of the electrode support conduit coated with an electrical insulator, and shows the electrode support conduit coated with an electrical insulator. The insulator 3 formed by the method described above is provided on the outer circumferential surface of a metal conduit unit which is coupled and supported.

In general, the length of a metal conduit is approximately θ0−AOOtn.
is required, but what is the length of regular steel pipes, stainless steel pipes, etc.? r-! ; Since it is Om, insert the individual conduits while joining them one after another. FIG. 2 shows a joint of metal conduits covered with an electrical insulator, a metal conduit 2a coated with a P3 edge 3a and a metal conduit 2 coated with an insulator 3b.
When joining the metal conduits 2a and 2b, taper screws S are cut at the ends of each of the metal conduits 2a and 2b, and the couplings ILt7.
．． Use to join. In that case, an insulator 3''c is further provided and coated over the joint, that is, the surface of the coupler and the end of the metal conduit, in order to prevent electrical leakage from the joint.

Next, the method and properties of the electrical insulator 3, 3a, 3b, or 3c will be explained in more detail with reference to data of Examples and Comparative Examples, but the present invention is limited only to these Examples. It's not a thing.

Example A tape made of a polyetheretherketone resin film with a thickness of 0.10 m @ 30 trrn was wound 7 times in a half-overlap manner on the outer peripheral surface of a metal conduit, and then a tape with a thickness of 0.2
0 Ayu, width 30vs, polyether sulfone resin (p, h
A glass fiber tape having a content of s) of 30% by weight was wound once in a half-overlap manner. This polyetheretherketone resin film tape and polyethersulfone resin (F
The winding operation of the glass fiber tape containing 30% by weight of Es) was repeated a total of 5 times, and then the thickness was further increased. A composite of glass fiber impregnated with polyether ether ketone resin and polyether sulfone resin (PEA) is prepared by winding a polyether ether ketone resin film of 10 mm and width 30 m 7 times in a half-overlap manner to a thickness of 3.2 mm. A layer was formed on the outer circumferential surface of the metal conduit. Next, the four metal tubes wound with this composite layer were placed in a q-part mold and held down.
Heating to 3gθ℃ and applying a pressure of lθOK9/, L2, a composite insulator of glass fiber impregnated with polyetheretherketone (+?J fat polyethersulfone resin (PFiS)) was formed on the conduit. It was cold.

The adhesion strength (α
Bias 2) and withstand voltage value (K saw and its insulator were placed in water and heated to 300℃, and after a hot water test of SOO time in 300℃ hot water, adhesion strength and blood resistance measured at 25℃ The voltage values are shown in the Example column of the table.

Example 2~/2 An experiment was conducted in the same manner as in Example 1, except that the composition and molding conditions of the composite insulating layer were changed to those shown in the table, and an electrical insulator was formed on the outer peripheral surface of the metal conduit. The properties of the obtained insulators are shown in the table as Examples 1 to 12.

Example 13 Instead of half-wrapping the glass fiber tape in Example 1, a glass roving with a polyether sulfone resin (FEB) content of 30% by weight, a thickness of θ, and an O-head was used, and polyether ether ketone resin was used. An experiment was conducted in the same manner as in Example 1, except that the film was wound parallel to the film, and an electrical insulator was formed on the outer peripheral surface of the conduit, and the properties of the obtained insulator are shown in the table as Example 13.0 Comparison Example / 9 The composition or molding conditions of the composite insulating layer were changed, and the other conditions were as in Example 1.
An experiment was conducted in the same manner as above, and an electrical insulator was formed on the outer circumferential surface of a metal conduit under the @supination conditions of the present invention, and the characteristics of the obtained insulator are shown in the table as Comparative Example/-9.

/'/ As is clear from the results listed in the table, the electrode support conduit in which an electrical insulator is formed according to the present invention has excellent electrical properties, mechanical properties, and hot water resistance, and is suitable for electrical heating. This has the effect of providing a suitable electrode support conduit for use in extracting hydrocarbon underground resources.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of the lower end of an electrode support conduit according to an embodiment of the present invention, and FIG. 2 is a 1° vertical cross-sectional view showing the connecting structure of the electrode support conduit in FIG. /...electrode, 2. ．． 2a,,21)-Metal 2! tube 1
．． ? ,,? a. 30.3C...Electric Zetsu J1 body, l...Nol Tsubring,
S...Taper screw. In addition, the same reference numerals in each figure indicate the same number or the equivalent 141 (minute).

Claims (1)

[Scope of Claims] (1) An electrical insulator consisting of a plurality of alternating layers of polyetheretherketone resin film layers molded under heat and pressure and glass fiber layers impregnated with polyethersulfone resin or polysulfone resin. Electrode supporting conduit for electrical heating of hydrocarbon underground resources, with the outer circumferential surface of the conduit (Iifi) as a standby. (S) The thickness of the polyether ether ketone resin film layer is in the range of o, oi to 0. An electrode supporting conduit for electric heating of hydrocarbon underground resources according to claim 1. (3) A polyether ether ketone resin film and a polyether sulfone resin method or a polysulfone resin are applied to the outer peripheral surface of the metal conduit. It is characterized by having an electrical insulator formed by heating and press-molding impregnated glass fibers alternately wound multiple times at a temperature of 3 degrees, a temperature of θ to 5θ degrees Celsius, and a pressure of 1θ to 20θ5 degrees. A method for manufacturing an electrode support conduit for electric heating of hydrocarbon underground resources◇