Heavy oil underground electric heating and temperature and pressure monitoring integrated cable

Abstract

The utility model belongs to the field of integration of heavy oil underground electric heating and temperature and pressure monitoring, and particularly relates to a heavy oil underground electric heating and temperature and pressure monitoring integrated cable which comprises a high-voltage conductor and a low-voltage conductor, the high-voltage conductor is a single-core high-voltage conductor, the low-voltage conductor is a three-core low-voltage conductor, and the high-voltage conductor is a single-core high-voltage conductor. The high-voltage conductor and the low-voltage conductor are sleeved with insulating layers. The high-voltage conductor is connected with the electric heater, the low-voltage conductor is connected with the temperature sensor and the pressure sensor, and two control switches are arranged at one end, far away from the electric heater, the temperature sensor and the pressure sensor, of the cable respectively and control the high-voltage conductor and the low-voltage conductor respectively. The heavy oil underground electric heating and temperature and pressure monitoring integrated cable is simple and reasonable in structure, novel in design, easy to operate, high in practicability and convenient to widely popularize and use.

Description

Technical Field

[0001] The utility model belongs to the field of integrated downhole electric heating and temperature - pressure monitoring of heavy oil, and specifically relates to an integrated cable for downhole electric heating and temperature - pressure monitoring of heavy oil. Background Art

[0002] An integrated cable is usually a cable similar to a rope formed by stranding several or several groups of wires (at least two wires in each group). The wires in each group are insulated from each other and are often twisted around a center, and the whole is wrapped with a highly insulating covering layer. The cable has the characteristics of being electrically conductive inside and insulated outside.

[0003] The existing integrated cables mainly have the following disadvantages:

[0004] 1. Poor flame - retardant protection ability. Most integrated cables use polyvinyl chloride as the flame - retardant material. Although polyvinyl chloride has a certain flame - retardant ability, it cannot achieve complete flame retardancy. Especially in heavy - oil wells where there are sufficient combustion conditions, a single spark may ignite the heavy - oil well.

[0005] 2. Unable to output two voltages of high and low simultaneously. Since the common electrical appliances in heavy - oil wells are electric heaters, temperature sensors, and pressure sensors, the voltage used by the electric heater is high voltage, while the voltage used by the temperature sensor and pressure sensor is low voltage. When the electric heater is in use, it needs to be frequently powered off. To ensure safety, many workers often turn off the main power supply after work, resulting in the temperature sensor and pressure sensor also stopping working. Therefore, it is not very suitable to use one cable to control these two types of electrical appliances. The temperature sensor and pressure sensor are basically not powered off during use, while the existing integrated cable can only output one voltage and relies on a power strip to connect devices. The oil in the heavy - oil well is likely to drip into the power strip, causing a short - circuit inside the power strip.

[0006] Therefore, we make improvements and propose an integrated cable for downhole electric heating and temperature - pressure monitoring of heavy oil. Content of the Utility Model

[0007] In order to make up for the deficiencies of the prior art and solve the problems of poor flame retardant protection ability, most integrated cables use polyvinyl chloride as the flame retardant material. Although polyvinyl chloride has a certain flame retardant ability, it cannot achieve complete flame retardance. Especially in heavy oil wells, there are sufficient combustion conditions, and a single spark may ignite the heavy oil well. It is also unable to output two kinds of voltages, high and low, at the same time. Since the commonly used electrical appliances in heavy oil wells are electric heaters, temperature sensors and pressure sensors, the voltage used by the electric heater is high voltage, while the voltage used by the temperature sensor and pressure sensor is low voltage. The electric heater needs to be frequently powered off during use, while the temperature sensor and pressure sensor are basically not powered off during use. Many workers often turn off the main power supply after work to ensure safety, resulting in the temperature sensor and pressure sensor also stopping working. Therefore, it is not very suitable to use one cable to control these two kinds of electrical appliances. The existing integrated cables can only output one kind of voltage and rely on power strips to connect devices. The oil in the heavy oil well is very easy to drip into the power strip, causing a problem of internal short circuit of the power strip.

[0008] The technical solution adopted by the present utility model to solve its technical problems is: to provide an integrated cable for integrated downhole electric heating and temperature and pressure monitoring in heavy oil wells, including: a high-voltage conductor and a low-voltage conductor. The high-voltage conductor is a single-core high-voltage conductor, and the low-voltage conductor is a three-core low-voltage conductor. Insulation layers are sleeved outside both the high-voltage conductor and the low-voltage conductor. A nitrogen layer is provided outside the insulation layers of the high-voltage conductor and the low-voltage conductor. An inner protective layer is provided outside the nitrogen layer, and an outer protective layer is provided outside the inner protective layer.

[0009] During operation, connect the high-voltage conductor to the electric heater, and connect the low-voltage conductor to the temperature sensor and the pressure sensor. And at the ends of this cable far from the electric heater and the temperature sensor and the pressure sensor, two control switches are respectively provided. The two switches respectively control the high-voltage conductor and the low-voltage conductor, enabling the staff to separately control two different devices.

[0010] Preferably, a heat insulation layer is provided outside the insulation layer of the high-voltage conductor. The material of the heat insulation layer is heat insulation glue. The heat insulation layer is located inside the nitrogen layer. Both the high-voltage conductor and the low-voltage conductor are made of multiple copper wires stranded and drawn.

[0011] During operation, through the setting of the heat insulation layer, the heat insulation layer insulates the heat generated by the high-voltage conductor, so that it will not affect the low-voltage conductor.

[0012] Preferably, a shielding layer is provided between the nitrogen layer and the inner protective layer. The shielding layer is a layer of conductive semiconductor layer. The nitrogen layer is a tubular body filled with nitrogen inside.

[0013] During operation, since the shielding layer is a layer of conductive semiconductor layer, the electric field is made uniform through the semiconductor layer to prevent partial discharge. Since nitrogen is an incombustible inert gas, it is safer and more reliable than polyvinyl chloride which is difficult to burn.

[0014] Preferably, the inner sheath is made of polyvinyl chloride material.

[0015] During operation, since the inner sheath is made of polyvinyl chloride which has good weather resistance, aging resistance, flame retardancy and other characteristics, the cable is made more stable.

[0016] Preferably, a metal armor is provided between the inner sheath and the outer sheath, and the material of the metal armor is steel strip.

[0017] During operation, the setting of the metal armor enables the armored cable to increase the mechanical strength of the cable and improve the anti-corrosion ability.

[0018] Preferably, the outer sheath is made of polyvinyl chloride material.

[0019] During operation, since the outer sheath is made of polyvinyl chloride which has good weather resistance, aging resistance, flame retardancy and other characteristics, the cable is made more stable.

[0020] The specific beneficial effects are as follows:

[0021] 1. For the integrated cable for downhole electric heating and temperature-pressure monitoring of heavy oil of the present utility model, through the settings of the high-voltage conductor, low-voltage conductor, nitrogen layer, inner sheath and outer sheath, different types of devices can be connected respectively through the high-voltage conductor and the low-voltage conductor, enabling the staff to control the two different devices separately, and since nitrogen is an incombustible inert gas, the cable can achieve complete flame retardancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present utility model will be further described below with reference to the accompanying drawings.

[0023] Figure 1 is a cross-sectional view of the present utility model;

[0024] Figure 2 is a perspective view of the present utility model.

[0025] In the figure: 1. High-voltage conductor; 2. Low-voltage conductor; 3. Nitrogen layer; 4. Shielding layer; 5. Inner sheath; 6. Metal armor; 7. Outer sheath; 8. Heat insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the specific embodiments.

[0027] Such as Figure 1-2As shown in the figure, an integrated cable for downhole electric heating and temperature and pressure monitoring of heavy oil includes: a high-voltage conductor 1 and a low-voltage conductor 2. The high-voltage conductor 1 is a single-core high-voltage conductor, and the low-voltage conductor 2 is a three-core low-voltage conductor. Insulation layers are sleeved outside both the high-voltage conductor 1 and the low-voltage conductor 2. A nitrogen layer 3 is provided outside the insulation layers of the high-voltage conductor 1 and the low-voltage conductor 2. An inner sheath 5 is provided outside the nitrogen layer 3, and an outer sheath 7 is provided outside the inner sheath 5.

[0028] During operation, connect the high-voltage conductor 1 to the electric heater, connect the low-voltage conductor 2 to the temperature sensor and the pressure sensor, and two control switches are respectively provided at one end of this cable far from the electric heater, the temperature sensor, and the pressure sensor. The two switches respectively control the high-voltage conductor 1 and the low-voltage conductor 2, enabling the staff to separately control two different devices.

[0029] Preferably, a heat insulation layer 8 is provided outside the insulation layer of the high-voltage conductor 1. The material of the heat insulation layer 8 is heat insulation glue. The heat insulation layer 8 is located inside the nitrogen layer 3. Both the high-voltage conductor 1 and the low-voltage conductor 2 are formed by stranding and drawing multiple copper wires.

[0030] During operation, due to the setting of the heat insulation layer 8, the heat insulation layer 8 insulates the heat generated by the high-voltage conductor 1 so that it will not affect the low-voltage conductor 2.

[0031] Preferably, a shielding layer 4 is provided between the nitrogen layer 3 and the inner sheath 5. The shielding layer 4 is a layer of conductive semiconductor layer, and the nitrogen layer 3 is a tubular body filled with nitrogen inside.

[0032] During operation, since the shielding layer 4 is a layer of conductive semiconductor layer, the electric field is made uniform through the semiconductor layer to prevent partial discharge. Since nitrogen is an incombustible inert gas, it is safer and more reliable than polyvinyl chloride which is difficult to burn.

[0033] Preferably, the inner sheath 5 is made of polyvinyl chloride material.

[0034] During operation, since the inner sheath 5 is made of polyvinyl chloride, and polyvinyl chloride has good weather resistance, aging resistance, flame retardancy and other characteristics, this cable is made more stable.

[0035] Preferably, a metal armor 6 is provided between the inner sheath 5 and the outer sheath 7. The material of the metal armor 6 is steel strip.

[0036] During operation, due to the setting of the metal armor 6, the armored cable is used to increase the mechanical strength of the cable and improve the anti-erosion ability.

[0037] Preferably, the outer sheath 7 is made of polyvinyl chloride material.

[0038] During operation, since the outer sheath 7 is made of polyvinyl chloride, and polyvinyl chloride has good weather resistance, aging resistance, flame retardancy and other characteristics, this cable is made more stable.

[0039] The specific working process is as follows:

[0040] Connect the high-voltage conductor 1 to the electric heater, connect the low-voltage conductor 2 to the temperature sensor and the pressure sensor, and two control switches are respectively provided at the ends of this cable far from the electric heater, the temperature sensor and the pressure sensor. The two switches respectively control the high-voltage conductor 1 and the low-voltage conductor 2, enabling the staff to separately control two different devices. Through the setting of the heat insulation layer 8, the heat insulation layer 8 insulates the heat generated by the high-voltage conductor 1 so that it will not affect the low-voltage conductor 2. The shielding layer 4 is a layer of conductive semiconductor layer, and the electric field is made uniform through the semiconductor layer to prevent partial discharge. Since nitrogen is an incombustible inert gas, it is safer and more reliable than the relatively difficult-to-burn polyvinyl chloride. The inner sheath 5 is made of polyvinyl chloride, and polyvinyl chloride has good weather resistance, aging resistance, flame retardancy and other characteristics, making this cable more stable. Through the setting of the metal armor 6, the armored cable is used to increase the mechanical strength of the cable and improve the anti-corrosion ability. The outer sheath 7 is made of polyvinyl chloride, and polyvinyl chloride has good weather resistance, aging resistance, flame retardancy and other characteristics, making this cable more stable.

[0041] The above front, back, left, right, up, and down are all based on the Figure 1 in the accompanying drawings of the specification. Taking the perspective of the person observing as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "middle", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 a limitation on the protection scope of the present invention.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated cable for downhole electric heating and temperature - pressure monitoring of heavy oil, characterized in that, Comprising: A high-voltage conductor (1) and a low-voltage conductor (2), wherein the high-voltage conductor (1) is a single-core high-voltage conductor, and the low-voltage conductor (2) is a three-core low-voltage conductor. Insulation layers are sleeved outside both the high-voltage conductor (1) and the low-voltage conductor (2). A nitrogen layer (3) is provided outside the insulation layers of the high-voltage conductor (1) and the low-voltage conductor (2). An inner sheath (5) is provided outside the nitrogen layer (3), and an outer sheath (7) is provided outside the inner sheath (5).

2. An integrated cable for downhole electroheating and temperature and pressure monitoring of heavy oil according to claim 1, characterized in that: An insulating layer (8) is provided outside the insulation layer of the high-voltage conductor (1). The material of the insulating layer (8) is heat-insulating glue. The insulating layer (8) is located inside the nitrogen layer (3). Both the high-voltage conductor (1) and the low-voltage conductor (2) are formed by stranding and drawing a plurality of copper wires.

3. The integrated cable for downhole electric heating and temperature and pressure monitoring of heavy oil according to claim 2, wherein: A shielding layer (4) is provided between the nitrogen layer (3) and the inner sheath (5). The shielding layer (4) is a layer of conductive semiconductor layer. The nitrogen layer (3) is a tubular body filled with nitrogen inside.

4. The integrated cable for downhole electric heating and temperature and pressure monitoring of heavy oil according to claim 3, characterized in that: The inner sheath (5) is made of polyvinyl chloride material.

5. An integrated cable for downhole electric heating and temperature and pressure monitoring of heavy oil, as claimed in claim 4, wherein: A metal armor (6) is provided between the inner sheath (5) and the outer sheath (7). The material of the metal armor (6) is steel strip.

6. The integrated cable for downhole electric heating and temperature and pressure monitoring of heavy oil according to claim 5, wherein: The outer sheath (7) is made of polyvinyl chloride material.

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