Temperature-sensing heat-conducting high-power insulating heating cable

Abstract

The utility model belongs to the technical field of heating cables, and provides a temperature-sensing heat-conducting high-power insulating heating cable, which comprises three phases of power lines arranged in parallel; the insulating layer is arranged on the outer side of the three-phase power line; the inner protective metal layer is arranged on the outer side of the insulating layer; the temperature sensing test line is arranged on the outer side of the metal layer; the heat conduction wire is arranged on the outer side of the metal layer, and the heat conduction wire and the temperature sensing test wire are arranged in the circumferential direction of the outer wall of the inner protection metal layer; and the corrosion-resistant outer metal sleeve is arranged on the outer side of the temperature sensing test wire and the heat conduction wire. According to the utility model, the temperature sensing test line and the three-phase power line jointly form the temperature sensing heat conduction type high-power insulation heating cable, and the temperature sensing line and the heating cable are put into a well at the same time, so that whether the heating cable is abnormal or not can be intuitively judged through the temperature sensing test line, the accuracy of the heating cable in use is improved, and the operation is facilitated at the same time.

Description

Technical Field

[0001] This utility model relates to the field of heating cable technology, specifically to a temperature-sensitive, heat-conducting, high-power insulated heating cable. Background Technology

[0002] The oil industry currently invests significant effort and resources in heavy oil extraction. Traditional heavy oil extraction utilizes natural gas and coal to collect steam for thinning, but this method results in substantial waste—accounting for over 70% of all oil extraction resources—and generates large amounts of waste gas and pollution, contradicting current green and environmentally friendly production policies. Therefore, "electricity instead of steam" has become a crucial improvement solution for heavy oil extraction. Currently, oilfield companies inject over 20 million tons of steam annually into the ground for heavy oil development, consuming nearly 1.6 billion cubic meters of natural gas and generating substantial carbon emissions. With my country's "dual carbon" goals being implemented, the high-energy-consuming and high-carbon-emission extraction methods of heavy oil thermal recovery must be transformed. In the past two years, oilfield companies have actively explored new "electricity instead of gas" methods for the green transformation of heavy oil, gradually replacing traditional gas-fired boilers with electricity to minimize carbon emissions. Using heating cables is a simple method, especially in the thermal recovery processes of heavy oil, extra-heavy oil, high-wax oil and gas, and shale oil. They can be used to enhance crude oil recovery, ensure stable oil and gas production, and increase oil and gas production capacity.

[0003] Currently, heating cables are mostly used for single-function heating, especially in small areas where the temperature is easily perceived by the human body. However, in oil wells, due to complex downhole conditions and locations more than 2000 meters below the surface, it is impossible to directly sense temperature changes. This often leads to the cable burning out, affecting product lifespan and usability. To address this, temperature sensors are placed outside the heating cable, meaning they are separately lowered into the well. This allows the temperature sensor to detect downhole temperatures. However, due to the complex downhole environment and the distance from the heating cable, the obtained data differs from actual operating conditions, resulting in poor accuracy. Furthermore, the placement of the temperature sensor cable varies; it may be too close to the well wall or covered by oil, preventing accurate measurement of the heating cable and causing it to burn out. Furthermore, existing heating cables cannot collect temperature data on-site or transmit temperature control data to the central control platform in real time, posing challenges to digital management. This makes it difficult for staff to visually assess whether heating cables are abnormal during routine maintenance, hindering timely replacement of damaged cables and negatively impacting temperature anomaly monitoring, thus creating potential safety hazards. Even manual routine inspections of multiple heating cables are not only labor-intensive and inconvenient, but also costly. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high-power insulated heating cable with temperature sensing and thermal conductivity, which solves the problem of poor monitoring results caused by separately lowering temperature sensing cables and heating cables into the well.

[0005] This utility model provides a temperature-sensitive, heat-conducting, high-power insulated heating cable, comprising:

[0006] The three-phase power lines are arranged in parallel to each other;

[0007] An insulating layer is disposed on the outside of the three-phase power lines;

[0008] An inner protective metal layer is disposed on the outside of the insulating layer;

[0009] Temperature-sensitive test leads are disposed on the outer side of the metal layer;

[0010] A heat-conducting wire is disposed on the outside of the metal layer, and the heat-conducting wire and the temperature-sensing test wire are arranged circumferentially along the outer wall of the inner protective metal layer.

[0011] A corrosion-resistant outer metal sleeve is provided on the outside of the temperature-sensing test line and the heat-conducting line.

[0012] As can be seen from the above technical solution, this utility model forms a high-power insulated heating cable with temperature sensing and heat conduction by combining the temperature sensing test line and the three-phase power line. The temperature sensing line and the heating cable are lowered into the well at the same time. It is possible to intuitively judge whether the heating cable is abnormal through the temperature sensing test line, which improves the accuracy of the heating cable during use and facilitates operation.

[0013] Optionally, the three-phase power line includes copper conductors and heating alloy wires respectively disposed at both ends along the cable length. One end of the heating alloy wire is connected to the copper conductor, and the other ends intersect at a point and are connected to each other. The resistivity of the copper conductor is ≤0.017241Ω·mm² / m, meeting the DC resistivity requirements of GB / T 3953—2009. The connection between the copper conductor and the heating alloy wire is welded. The heating alloy wire is set according to the required heating length to meet the needs of different working conditions and realize the underground heating of the cable. The outer ends of the three heating alloy wires converge at one point and are connected to each other.

[0014] Optionally, when the number of temperature-sensing test lines is greater than one, the temperature-sensing test lines are spaced apart. The number of temperature-sensing test lines is set according to the actual requirements of the test points. When multiple test points are required, the temperature-sensing test lines are separated by heat-conducting wires to ensure the temperature testing effect.

[0015] Optionally, the temperature-sensing test line and the heat-conducting wire have the same diameter.

[0016] Optionally, the insulating layer is densely formed from inorganic mineral insulating powder. It can withstand flame burning at 950℃ for 180 minutes and withstand high voltage above 2500V for 5 minutes without insulation breakdown, even under conditions of high insulation resistance constant. Furthermore, this insulating material differs from ordinary insulation in that it allows the product to be reused after voltage breakdown.

[0017] Optionally, the inner protective metal layer is made of high-purity copper or a copper alloy. This effectively ensures the product's insulation is tight and prevents the risk of cable breakdown caused by external damage. The alloy contains ≥99.9% copper and silver, providing sealing and protection effects, while also effectively transferring heat during the product's heating process.

[0018] Optionally, the heat-conducting wire is a galvanized alloy wire. The alloy wire is coated with a layer that ensures it will not corrode in high-temperature and humid environments, and will not undergo qualitative changes at high temperatures of 1000°C. This effectively transfers the heat generated by the temperature-sensitive, high-power mineral-insulated heating cable into the well shaft, preventing excessive internal temperature and dry burning.

[0019] Optionally, the corrosion-resistant outer metal sleeve is made of nickel-chromium alloy longitudinally welded. It has good corrosion resistance and impact resistance, and can be used in harsh environments such as humid and brine environments in oil wells, with a pressure resistance of up to 35 MPa.

[0020] By adopting the above technical solution, this application has the following technical effects:

[0021] This invention combines a temperature-sensing test lead and a three-phase power line to form a high-power, temperature-conducting, insulated heating cable. The temperature sensor and the heating cable can be lowered into the well simultaneously, allowing for direct assessment of any abnormalities in the heating cable via the temperature sensor. This avoids the current problem of separate lowering of the temperature sensor and heating cable into the well, which leads to inaccurate testing due to the complex underground environment and different placement of the heating cable and temperature sensor. Furthermore, this invention prevents the heating cable from burning out and extends its service life. Simultaneous lowering of both into the well also facilitates operation and reduces the workload of construction workers. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 A cross-sectional view of a temperature-sensitive, heat-conducting, high-power insulated heating cable provided for an embodiment of this utility model.

[0024] Figure label:

[0025] 1-Three-phase power line; 2-Insulation layer; 3-Inner protective metal layer; 4-Temperature sensing test line; 5-Heat-conducting wire; 6-Corrosion-resistant outer metal sheath. Detailed Implementation

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0028] In the description of this application, it should be understood that the terms "circumferential", "outer", etc., indicate the orientation or positional relationship 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, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] like Figure 1 As shown, this utility model provides a high-power insulated heating cable with temperature sensing and heat conduction, comprising three-phase power lines 1, an insulation layer 2, an inner protective metal layer 3, temperature sensing test lines 4, heat conduction lines 5, and a corrosion-resistant metal outer sheath 6. The three-phase power lines 1 are arranged parallel to each other; the insulation layer 2 is disposed on the outside of the three-phase power lines 1; the inner protective metal layer 3 is disposed on the outside of the insulation layer 2; the temperature sensing test lines 4 are disposed on the outside of the metal layer; the heat conduction lines 5 are disposed on the outside of the metal layer, and the heat conduction lines 5 and the temperature sensing test lines 4 are arranged circumferentially along the outer wall of the inner protective metal layer 3; the corrosion-resistant outer metal sheath 6 is disposed on the outside of the temperature sensing test lines 4 and the heat conduction lines 5.

[0030] Based on the above solution, by combining the temperature-sensing test line 4 and the three-phase power line 1 to form a temperature-sensing, heat-conducting, high-power insulated heating cable, the temperature-sensing line and the heating cable can be lowered into the well simultaneously. The abnormality of the heating cable can be directly determined through the temperature-sensing test line 4, avoiding the current problem of low testing accuracy caused by the separate lowering of the temperature-sensing test line 4 and the heating cable into the well, and the different placement of the heating cable and temperature-sensing line due to the complex underground environment. This also prevents the heating cable from dry-burning and fails, extending its service life. Furthermore, lowering both lines into the well simultaneously facilitates operation and reduces the labor intensity of construction personnel.

[0031] The three-phase power lines 1 are arranged in parallel to each other, which can ensure that the insulation layer 2 has a uniform thickness and avoid affecting daily work.

[0032] Optionally, the three-phase power line 1 includes copper conductors and heating alloy wires respectively disposed at both ends along the cable length. One end of the heating alloy wire is connected to the copper conductor, and the other ends intersect at a point and are connected to each other. The resistivity of the copper conductor is ≤0.017241Ω·mm² / m, which meets the DC resistivity requirements of GB / T 3953—2009. The connection between the copper conductor and the heating alloy wire is welded. The heating alloy wire is set according to the required heating length, which can meet the needs of different working conditions and realize the underground heating of the cable.

[0033] Optionally, when the number of temperature-sensing test lines 4 is greater than one, the temperature-sensing test lines 4 are spaced apart. The number of temperature-sensing test lines 4 is set according to the actual test point requirements. When multiple test points are required, the temperature-sensing test lines 4 are separated by heat-conducting wires 5 to ensure the temperature test effect.

[0034] Optionally, the temperature-sensing test wire 4 and the heat-conducting wire 5 have the same diameter. The temperature-sensing test wire 4 and the heat-conducting wire 5 are arranged closely together, and the distance between them does not exceed the diameter of a single filament of the temperature-sensing test wire 4 or the heat-conducting wire 5.

[0035] Optionally, the insulation layer 2 is densely formed from inorganic mineral insulating powder. Under conditions of high insulation resistance constant, it can withstand flame burning at 950℃ for 180 minutes and withstand high voltage above 2500V for 5 minutes without insulation breakdown. At the same time, the difference between this insulation material and general insulation is that it can ensure that the product can be reused after voltage breakdown.

[0036] Optionally, the inner protective metal layer 3 is made of copper or a copper alloy. This effectively ensures the product's insulation is tight and prevents the risk of cable breakdown caused by external damage. The copper alloy has a copper and silver content of ≥99.9%, providing sealing and protection, while also effectively transferring heat during the product's heating process.

[0037] Optionally, the heat-conducting wire 5 is a galvanized alloy wire; the surface of the alloy wire is coated with a coating to ensure that it will not corrode in high temperature, humid environment, etc., and will not undergo qualitative change at a high temperature of 1000℃. It can effectively transfer the heat generated by the temperature-sensitive heat-conducting high-power mineral insulated heating cable to the well shaft and avoid excessive internal temperature and dry burning.

[0038] Optionally, the temperature sensing test line 4 is composed of a high-nickel alloy wire, specifically high-nickel alloy steel; using this material can meet a bending radius of 5 times, a long-term maximum operating temperature of 600℃, a short-term maximum operating temperature of 700℃, and can withstand a high temperature of 1050℃ without undergoing qualitative change.

[0039] Optionally, the corrosion-resistant outer metal sheath 6 is made of nickel-chromium alloy longitudinally welded. It has good corrosion resistance and impact resistance, and can be used in harsh environments such as humid and brine environments in oil wells, with a pressure resistance of up to 35 MPa. The overall cable structure is dense, sturdy and durable, and can withstand external forces such as extrusion and impact. It can also withstand mechanical impact and spraying under high temperature conditions, maintaining normal cable power transmission.

[0040] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A temperature-sensitive, heat-conducting, high-power insulated heating cable, characterized in that, include: The three-phase power lines are arranged in parallel to each other; An insulating layer is disposed on the outside of the three-phase power lines; An inner protective metal layer is disposed on the outside of the insulating layer; Temperature-sensitive test leads are disposed on the outer side of the metal layer; A heat-conducting wire is disposed on the outside of the metal layer, and the heat-conducting wire and the temperature-sensing test wire are arranged circumferentially along the outer wall of the inner protective metal layer. A corrosion-resistant outer metal sleeve is provided on the outside of the temperature-sensing test line and the heat-conducting line.

2. The temperature-sensitive, thermally conductive, high-power insulated heating cable according to claim 1, characterized in that, The three-phase power line includes copper conductors and heating alloy wires respectively disposed at both ends along the length of the cable. One end of the heating alloy wire is connected to the copper conductor, and the other ends intersect at a point and are connected to each other.

3. The temperature-sensing, thermally conductive, high-power insulated heating cable according to claim 2, characterized in that, When the number of temperature-sensing test lines is greater than one, the temperature-sensing test lines are spaced apart.

4. The temperature-sensing, thermally conductive, high-power insulated heating cable according to claim 3, characterized in that, The temperature-sensing test line and the heat-conducting line have the same diameter.

5. The temperature-sensitive, thermally conductive, high-power insulated heating cable according to claim 1, characterized in that, The insulating layer is made of dense inorganic mineral insulating powder.

6. The temperature-sensitive, thermally conductive, high-power insulated heating cable according to claim 1, characterized in that, The inner protective metal layer is made of copper or a copper alloy.

7. The temperature-sensing, thermally conductive, high-power insulated heating cable according to claim 1, characterized in that, The heat-conducting wire is a galvanized alloy wire.

8. The temperature-sensing, thermally conductive, high-power insulated heating cable according to claim 1, characterized in that, The corrosion-resistant outer metal sleeve is made of nickel-chromium alloy longitudinally welded together.

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