Ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor and preparation method thereof

Abstract

The present invention relates to an ultra-long multi-point oil well temperature sensor resistant to high temperature and high pressure and a preparation method thereof. First, a protective tube, a positive electrode wire, a negative electrode wire and an insulating material are assembled into an armored thermocouple, and then the positional relationship of each positive electrode wire and the negative electrode wire is determined by perspective technology, and the position of the temperature measuring point is set. Then, a process hole is processed, and the positive electrode wire and the negative electrode wire are connected through the process hole to form a temperature measuring point, and finally connected with a junction box and a temperature transmitter; the prepared sensor includes an armored thermocouple, which is mainly composed of a protective tube and a positive electrode wire, a plurality of negative electrode wires and a plurality of temperature measuring points located therein, and the temperature measuring points are distributed along the length direction of the armored thermocouple, the number of positive electrode wires is one or the same as the negative electrode wire, and different positions of a positive electrode wire or a plurality of positive electrode wires are connected with the negative electrode wire to form a plurality of temperature measuring points. The preparation process of the present invention is simple, and the prepared sensor can withstand high temperature and high pressure, and is suitable for long-term work in oil wells.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors and relates to an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor and a preparation method thereof. Background Art

[0002] In order to extract deep well heavy oil during oil extraction, the deep well heavy oil must be heated and diluted, and then pumped out of the ground through an oil pump. In this process, in order to dilute the heavy oil to the best extraction state, it is necessary to track the temperature information of the heating system during heating, such as heating and constant temperature information. Therefore, an oil well temperature sensor is needed. The operating environment of the sensor is high temperature and high pressure, gas media such as hydrogen sulfide and ammonia nitrogen, and the sensor length is required to reach several thousand meters, with fast response speed and high accuracy.

[0003] The principle commonly used to collect the temperature of multiple oil wells is to configure multiple thermocouples and set multiple temperature measurement points at different positions of the sensor. However, the connection methods of thermocouples and temperature measurement points are different, but all of them have the problems of large sensor diameter, poor flexibility, and insufficient pressure bearing capacity. The existing technology of multiple thermocouples is to make the processing of a single thermocouple thinner and simpler under the premise of meeting the length of 1000 meters, and to achieve multi-point connection by using them side by side. For example, in the public information of patent CN201306168Y, the technical path adopted is: multiple independent armored thermocouples are bundled into a bundle, and the outside is wrapped with stainless steel strips and welded and covered and the ends are closed; in the public information of patent CN203285426U, the technical path adopted is: a single thermocouple cable is coated with a layer of insulation, and then multiple cables are coated with a layer of insulation together, and then set in a stainless steel pipe, and then two layers of stainless steel pipes are respectively covered, and then the filler is coated, and finally a layer of insulation is coated. The disadvantages of the above two patents are: the welding process is adopted, the product has a seam structure, and the pressure bearing performance is poor; in addition, when there are many temperature measurement points, the product diameter is large, and the multi-layer shell makes the product less flexible. In order to improve this problem, under the premise of meeting the requirements of thermocouple length, the defects of product structure processing can be reduced as much as possible, and the overall diameter of the product can be reduced and the flexibility can be increased, which will greatly improve the applicable value of the product.

[0004] Therefore, it is of great significance to study a multi-point oil well temperature sensor with strong pressure bearing capacity, small overall diameter and good flexibility. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art that multi-point oil well temperature sensors have no resistance to high pressure, large overall diameter and poor flexibility when the length is more than 1000 meters, and to provide an ultra-long multi-point oil well temperature sensor resistant to high temperature and high pressure and a preparation method thereof. The sensor is suitable for measuring the temperature gradient distribution of deep oil wells.

[0006] To achieve the above object, the scheme adopted by the present invention is as follows:

[0007] An ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor (the "extra-long" referred to here mainly refers to the length of the armored thermocouple, and the length of the armored thermocouple has no limit on the value range, and can be the same as the length of the high-temperature ultra-long oil well multi-point thermocouple in the prior art, or can be different from the prior art), including an armored thermocouple, the number of armored thermocouples is one, mainly composed of a protective tube and a positive electrode wire, multiple negative electrode wires and multiple temperature measuring points located in the protective tube, and the multiple temperature measuring points are distributed along the length direction of the armored thermocouple; the number of positive electrode wires is one, and different positions of one positive electrode wire are respectively connected to multiple negative electrode wires to form multiple temperature measuring points; or, the number of positive electrode wires is the same as that of negative electrode wires, and the positive electrode wires and negative electrode wires are connected one-to-one to form multiple temperature measuring points (that is, one positive electrode wire corresponds to one negative electrode wire).

[0008] The present invention improves the process and realizes the processing of temperature measuring points in the protective tube. Therefore, multiple temperature measuring points can be processed in one armored thermocouple at the same time. The prior art cannot process temperature measuring points in a protective tube. It is generally formed by passing the positive electrode wire and the negative electrode wire out of the protective tube and then connecting the positive electrode wire and the negative electrode wire outside the protective tube. Therefore, the prior art often can only have one armored thermocouple corresponding to one temperature measuring point. When multiple temperature measuring points need to be set, multiple armored thermocouples need to be combined together. Compared with the prior art, the number of armored thermocouples in the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor of the present invention is 1, and the number of protective tubes is also 1. In the prior art, the number of armored thermocouples is multiple, and the number of protective tubes is also multiple. Therefore, the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor of the present invention has a small overall diameter, is easier to bend, has better flexibility, conducts heat to the temperature measuring points faster, and has a faster temperature response.

[0009] As a preferred solution:

[0010] As described above, the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor has a wall thickness of 0.3-1.2 mm, an outer diameter of 1.6-12.7 mm, a number of multiple temperature measurement points of 2-8, and a length of the armored thermocouple greater than or equal to 1000 meters.

[0011] As described above, in an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor, the number of positive electrode wires is one, and all negative electrode wires are evenly distributed around the circumference of the positive electrode wire. With this arrangement, when the number of temperature measuring points is n, the number of internal positive and negative electrode wires is n+1.

[0012] As described above, in an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor, the number of positive electrode wires is the same as the number of negative electrode wires. With this arrangement, when the number of temperature measuring points is n, the number of internal wires is 2n.

[0013] As described above, the ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor, the protection tube is a seamless steel tube. Compared with the seamed structural steel tube in the prior art, since the seamless steel tube is formed in one piece and no welding process is used, the pressure-bearing performance is greatly enhanced and can withstand a pressure of 25MPa. The material of the protection tube is Inconel600 alloy, Inconel601 alloy, Inconel718 alloy, 310S stainless steel, 316L stainless steel or 304 stainless steel, these materials can withstand an operating temperature of 800°C.

[0014] In the ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor as described above, the protection tube is filled with insulating material to ensure insulation between the positive and negative electrode wires and the protection tube.

[0015] The ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor as described above also includes a junction box and a temperature transmitter located in the junction box, one end of the protective tube of the armored thermocouple is a closed end, and the other end is an extended end from which the positive electrode wire and the negative electrode wire extend, the extended end of the protective tube of the armored thermocouple is fixedly connected to the junction box, the number of temperature transmitters is the same as the temperature measuring points, and the temperature transmitter includes a positive terminal and a negative terminal; the negative terminals of all temperature transmitters are connected to all negative electrode wires in a one-to-one correspondence (i.e., one negative terminal corresponds to one negative electrode wire), when the number of positive electrode wires is one, the positive terminals of all temperature transmitters are connected to each other and the positive terminal of one of the temperature transmitters is connected to the positive electrode wire; when the number of positive electrode wires is the same as the negative electrode wires, the positive terminals of all temperature transmitters are connected to all positive electrode wires in a one-to-one correspondence (i.e., one positive terminal corresponds to one positive electrode wire).

[0016] The ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor as described above is fixedly connected by a ferrule screw, a screw joint or a flange.

[0017] The present invention also provides a method for preparing an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor as described in any of the above items. First, a protective tube, a positive electrode wire, a negative electrode wire and an insulating material are assembled into an armored thermocouple. Then, a perspective technology (such as X-ray) is used to determine the positional relationship between each positive electrode wire and each negative electrode wire inside the armored thermocouple (if there is other technology that can determine the positional relationship between each positive electrode wire and each negative electrode wire inside the armored thermocouple, it can also be applied to the present invention), the position of the temperature measuring point is set, and a mark is made on the protective tube corresponding to the set position of the temperature measuring point, then a process hole is processed at the marked position, and the positive electrode wire and the negative electrode wire are connected at the set position of the temperature measuring point through the process hole to form a temperature measuring point, and finally the protective tube is connected to the junction box, and the positive electrode wire and the negative electrode wire are connected to the temperature transmitter at the same time.

[0018] Beneficial effects:

[0019] (1) The preparation method of the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor of the present invention has simple process, reasonable cost and good promotion value;

[0020] (2) The ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor of the present invention has an armored structure for the thermocouple and a seamless steel pipe for the protection tube. It can withstand an external pressure of 25 MPa and has a maximum operating temperature of 800°C, and is suitable for long-term work in oil wells.

[0021] (3) The present invention provides an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor, in which one or more temperature measuring points of the armored thermocouple can be set, and the position can be set arbitrarily in the length direction, so as to accurately measure the distribution of different temperature gradients in the longitudinal direction of the oil well as much as possible, and meet the process requirements to the greatest extent;

[0022] (4) Compared with the prior art, the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor of the present invention has the advantages of small diameter, low cost, good flexibility and fast temperature response. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor of the present invention;

[0024] Figure 2 and Figure 3 They are schematic diagrams of the internal structure of an armored thermocouple of an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor of the present invention;

[0025] Among them, 1-armored thermocouple, 1.1-protective tube, 1.2-positive electrode wire, 1.3-negative electrode wire, 1.4-insulating material, 1.5-temperature measuring point I, 1.6-temperature measuring point II, 2-ferrule screw, 3-temperature transmitter, 4-junction box. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0027] Example 1

[0028] An ultra-long (1500 meters long) high temperature and high pressure resistant multi-point oil well temperature sensor, the structural schematic diagram of which is shown in FIG. Figure 1As shown, it includes an armored thermocouple 1, a junction box 4 and two temperature transmitters 3 located in the junction box 4. The armored thermocouple 1 consists of a protective tube 1.1, an insulating material filled in the protective tube 1.1, a positive electrode wire 1.2, two negative electrode wires 1.3 and two temperature measuring points located in the protective tube 1.1. The two temperature measuring points are distributed along the length direction of the armored thermocouple. The two negative electrode wires 1.3 are evenly distributed around the circumference of the positive electrode wire 1.2. Different positions of a positive electrode wire 1.2 are respectively connected to the two negative electrode wires 1.3 to form two temperature measuring points. point, one end of the protection tube 1.1 is a closed end, and the other end is an extended end from which the positive electrode wire 1.2 and the negative electrode wire 1.3 extend, the extended end of the protection tube 1.1 of the armored thermocouple is fixedly connected to the junction box 4, the temperature transmitter 3 includes a positive terminal and a negative terminal; all the negative terminals of the temperature transmitters 3 are connected to all the negative electrode wires 1.3 in a one-to-one correspondence, all the positive terminals of the temperature transmitters 3 are connected to each other and one of the positive terminals of the temperature transmitters 3 is connected to the positive electrode wire 1.2, and the preparation method of the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor is:

[0029] First, a protective tube 1.1, a positive electrode wire 1.2, a negative electrode wire 1.3 and an insulating material 1.4 are assembled and drawn into an armored thermocouple 1 with a length of 1500 meters, wherein one end of the protective tube 1.1 of the armored thermocouple 1 is a closed end, and the other end is an extended end from which the positive electrode wire 1.2 and the negative electrode wire 1.3 extend; wherein the protective tube 1.1 is a seamless steel tube made of Inconel600 alloy, with a wall thickness of 0.5 mm and an outer diameter of 4.0 mm, and the protective tube 1.1 is filled with an insulating material 1.4;

[0030] Then, the positional relationship between the positive electrode wire 1.2 and each negative electrode wire 1.3 inside the armored thermocouple 1 is determined by X-ray, the position of the temperature measuring point is set, and a mark is made on the protection tube 1.1 corresponding to the set position of the temperature measuring point;

[0031] Then, a process hole is processed at the marked position, and the positive electrode wire 1.2 and the negative electrode wire 1.3 are connected at the set position of the temperature measuring point through the process hole to form the temperature measuring point I1.5 and the temperature measuring point II1.6, as shown in FIG. Figure 3 As shown; wherein all temperature measurement points are distributed along the length direction of the armored thermocouple 1;

[0032] Finally, the extended end of the protective tube 1.1 of the armored thermocouple 1 is fixedly connected to the junction box 4, and the positive electrode wire 1.2 and the negative electrode wire 1.3 are connected to the terminals of each temperature transmitter 3 to make an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor; wherein, the fixed connection adopts a sleeve screw 2.

[0033] Embodiments 2 to 4

[0034] An ultra-long multi-point oil well temperature sensor resistant to high temperature and high pressure. The preparation method and product structure of embodiments 2 to 4 are basically the same as those of embodiment 1, except that the multi-point oil well temperature sensor resistant to high temperature and high pressure has the following characteristics: length, number of positive electrode filaments, number of negative electrode filaments, number of temperature measuring points, material and size of the protection tube, and fixed connection method. See the table below for details.

[0035]

[0036] Example 5

[0037] An ultra-long (2000 meters long) high temperature and high pressure resistant multi-point oil well temperature sensor, the structural schematic diagram of which is shown in FIG. Figure 2 As shown, it includes an armored thermocouple 1, a junction box 4 and two temperature transmitters 3 located in the junction box 4. The armored thermocouple 1 consists of a protection tube 1.1, an insulating material filled in the protection tube 1.1, two positive electrode wires 1.2, two negative electrode wires 1.3 and two temperature measuring points located in the protection tube 1.1. The two temperature measuring points are distributed along the length direction of the armored thermocouple. The positive electrode wire 1.2 and the negative electrode wire 1.3 are connected one by one to form a plurality of temperature measuring points. One end is a closed end, and the other end is an extended end from which the positive electrode wire 1.2 and the negative electrode wire 1.3 extend. The extended end of the protective tube 1.1 of the armored thermocouple is fixedly connected to the junction box 4. The temperature transmitter 3 includes a positive terminal and a negative terminal. All negative terminals of the temperature transmitters 3 are connected to all negative electrode wires 1.3 in a one-to-one correspondence. All positive terminals of the temperature transmitters 3 are connected to all positive electrode wires 1.2 in a one-to-one correspondence. The preparation method of the ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor is as follows:

[0038] First, a protective tube 1.1, a positive electrode wire 1.2, a negative electrode wire 1.3 and an insulating material 1.4 are assembled into an armored thermocouple 1 with a length of 2000 meters, wherein one end of the protective tube 1.1 of the armored thermocouple 1 is a closed end, and the other end is an extended end from which the positive electrode wire 1.2 and the negative electrode wire 1.3 extend; wherein the protective tube 1.1 is a seamless steel tube made of 316L stainless steel, with a wall thickness of 0.5 mm and an outer diameter of 5.0 mm, and the protective tube 1.1 is filled with an insulating material 1.4;

[0039] Then, the positional relationship between the positive electrode wire 1.2 and the negative electrode wire 1.3 inside the armored thermocouple 1 is determined by X-ray, the position of the temperature measuring point is set, and a mark is made on the protection tube 1.1 corresponding to the set position of the temperature measuring point;

[0040] Then, a process hole is processed at the marked position, and the positive electrode wire 1.2 and the negative electrode wire 1.3 are connected one by one at the set position of the temperature measuring point through the process hole to form a temperature measuring point I 1.5 and a temperature measuring point II 1.6; wherein, all the temperature measuring points are distributed along the length direction of the armored thermocouple 1;

[0041] Finally, the extended end of the protective tube 1.1 of the armored thermocouple 1 is fixedly connected to the junction box 4, and the positive electrode wire 1.2 and the negative electrode wire 1.3 are connected to the terminals of each temperature transmitter 3 to make an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor; wherein, the fixed connection adopts a sleeve screw 2.

[0042] Embodiments 6 to 9

[0043] An ultra-long multi-point oil well temperature sensor resistant to high temperature and high pressure. The preparation method and product structure of Examples 6 to 9 are basically the same as those of Example 5. The difference lies in the length of the multi-point oil well temperature sensor resistant to high temperature and high pressure, the number of positive electrode filaments, the number of negative electrode filaments, the number of temperature measuring points, the material and size of the protection tube, and the fixed connection method. See the table below for details.

[0044]

[0045]

Claims

1. A method for preparing an ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor, the ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor comprising an armored thermocouple, characterized in that: The number of the armored thermocouple is one, which is mainly composed of a protective tube, a positive electrode wire, a plurality of negative electrode wires and a plurality of temperature measuring points located in the protective tube, and the plurality of temperature measuring points are distributed along the length direction of the armored thermocouple; the number of the positive electrode wire is one, and different positions of the positive electrode wire are respectively connected with the plurality of negative electrode wires to form a plurality of temperature measuring points; or, the number of the positive electrode wires is the same as the negative electrode wires, and the positive electrode wires are connected with the negative electrode wires in a one-to-one correspondence to form a plurality of temperature measuring points; The preparation method of the ultra-long high-temperature and high-pressure resistant multi-point oil well temperature sensor is as follows: first, a protective tube, a positive electrode wire, a negative electrode wire and an insulating material are assembled into an armored thermocouple, and then the perspective technology is used to determine the positional relationship between the positive electrode wires and the negative electrode wires inside the armored thermocouple, the position of the temperature measuring point is set, and a mark is made on the protective tube corresponding to the set position of the temperature measuring point, and then a process hole is processed at the marked position, and the positive electrode wire and the negative electrode wire are connected at the set position of the temperature measuring point through the process hole to form a temperature measuring point, and finally the protective tube is connected to the junction box, and the positive electrode wire and the negative electrode wire are connected to the temperature transmitter at the same time.

2. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: The wall thickness of the protection tube is 0.3~1.2mm, the outer diameter is 1.6~12.7mm, the number of multiple temperature measuring points is 2~8, and the length of the armored thermocouple is greater than or equal to 1000 meters.

3. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: The number of the positive electrode filament is one, and all the negative electrode filaments are evenly distributed around the circumference of the positive electrode filament.

4. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: The number of positive electrode filaments is the same as that of negative electrode filaments.

5. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: The protective tube is a seamless steel tube made of Inconel600 alloy, Inconel601 alloy, Inconel718 alloy, 310S stainless steel, 316L stainless steel or 304 stainless steel.

6. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: The protective tube is filled with insulating material.

7. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 1, characterized in that: It also includes a junction box and a temperature transmitter located in the junction box. One end of the protective tube of the armored thermocouple is a closed end, and the other end is an extended end from which a positive electrode wire and a negative electrode wire extend. The extended end of the protective tube of the armored thermocouple is fixedly connected to the junction box. The number of temperature transmitters is the same as the temperature measuring points. The temperature transmitter includes a positive terminal and a negative terminal. All negative terminals of the temperature transmitters are connected to all negative electrode wires in a one-to-one correspondence. When the number of positive electrode wires is one, all positive terminals of the temperature transmitters are connected to each other and the positive terminal of one of the temperature transmitters is connected to the positive electrode wire. When the number of positive electrode wires is the same as the negative electrode wires, all positive terminals of the temperature transmitters are connected to all positive electrode wires in a one-to-one correspondence.

8. The method for preparing an ultra-long high temperature and high pressure resistant multi-point oil well temperature sensor according to claim 7, characterized in that: The fixed connection adopts compression screws, screw joints or flanges.

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