Viscosity reduction heating device in front of pump

Abstract

The utility model provides a before-pump viscosity reduction heating device, which comprises an oil pipe, a heater and a power supply device, the oil pipe is communicated with a Christmas tree, the heater is arranged on the oil pipe, the oil pipe section of the heater is a round pipe with a hole, the end part of the round pipe with the hole is provided with a round plug with a hole, and the heater is matched and connected with the power supply device. The power supply device comprises a low-voltage drawer switch, a boost frequency converter, a medium-voltage frequency conversion cabinet and a wellhead junction box, the low-voltage drawer switch is sequentially connected with the boost frequency converter, the medium-voltage frequency conversion cabinet and the wellhead junction box, and the wellhead junction box is respectively connected with the electric pump unit and the heater through cables. The device has the beneficial effects that the device is suitable for a special process for paraffin control of a high condensation layer and temperature-increasing and viscosity-reducing exploitation of a heavy oil well, the temperature of the heavy oil can be increased, the viscosity of the heavy oil is reduced, the fluidity of the heavy oil is improved, the exploitation difficulty is reduced, the oil well yield is improved, technical support is provided for large-scale development, and the device is easy to popularize and use.

Description

Technical Field

[0001] The utility model relates to the field of offshore heavy oil thermal recovery electric submersible pump lifting, and more specifically to a pre-pump viscosity reduction heating device. Background Art

[0002] In the process of thermal recovery of heavy oil, temperature has a great influence on heavy oil. For every 10 degrees decrease in temperature, the viscosity increases by 1 time. Low process temperature will increase the viscosity of heavy oil, thereby affecting the fluidity of crude oil, which in turn leads to poor fluidity of heavy oil, high pressure, and large electric pump current. With the increase in platform production, the difficulty of heavy oil recovery will further increase. How to increase the process temperature is particularly important. In order to increase the temperature of heavy oil, reduce the viscosity of heavy oil, and improve the efficiency of oil well recovery, heating is carried out in the oil well tubing to reduce the viscosity of heavy oil and increase its fluidity. Utility Model Content

[0003] The utility model overcomes the shortcomings of the prior art and provides a pre-pump viscosity reduction heating device.

[0004] The purpose of the utility model is achieved through the following technical solutions.

[0005] The pre-pump viscosity reduction heating device comprises an oil pipe, a heater and a power supply device. The oil pipe is connected to the Christmas tree, the heater is arranged on the oil pipe, the oil pipe section where the heater is arranged is a perforated round pipe, the end of the perforated round pipe is provided with a perforated round plug, and the heater is cooperatively connected with the power supply device.

[0006] The power supply device includes a low-voltage drawer switch, a step-up frequency converter, a medium-voltage frequency converter cabinet and a wellhead junction box. The low-voltage drawer switch is connected to the step-up frequency converter, the medium-voltage frequency converter cabinet and the wellhead junction box in sequence. The wellhead junction box is connected to the electric pump unit and the heater through cables.

[0007] The low-voltage drawer switch is a 4000V low-voltage drawer switch.

[0008] The wellhead junction box is an explosion-proof junction box.

[0009] The cable is connected to a quick connector arranged on the Christmas tree, and the quick connector is respectively connected to the electric pump unit and the heater through two independent cables.

[0010] The quick connector is a plug-in quick connector.

[0011] The cable and the heater are connected via a Y connector.

[0012] The heater is a heating cable.

[0013] The heater is arranged at the end of the oil pipe.

[0014] The beneficial effects of the utility model are:

[0015] This solution is suitable for the special process of wax prevention in high condensate layers and temperature-increasing and viscosity-reducing production of heavy oil wells. It can increase the temperature of heavy oil, reduce the viscosity of heavy oil, increase the fluidity of heavy oil, reduce the difficulty of production, increase the output of oil wells, provide technical support for large-scale development, and be easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] In the figure: 1. oil pipe; 11. round pipe with holes; 12. round plug with holes; 2. heater; 3. power supply device; 31. low-voltage drawer switch; 32. step-up inverter; 33. medium-voltage inverter cabinet; 34. wellhead junction box; 4. cable; 5. electric pump unit; 6. quick connector; 7. Y connector. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below through specific embodiments.

[0019] The pre-pump viscosity reduction heating device comprises an oil pipe 1, a heater 2 and a power supply device 3. The oil pipe 1 is connected to the Christmas tree, the heater 2 is arranged on the oil pipe 1, the section of the oil pipe 1 where the heater 2 is arranged is a perforated circular pipe 11, the end of the perforated circular pipe 11 is provided with a perforated circular plug 12, and the heater 2 is cooperatively connected with the power supply device 3.

[0020] The power supply device 3 includes a low-voltage drawer switch 31, a step-up frequency converter 32, a medium-voltage frequency converter cabinet 33 and a wellhead junction box 34. The low-voltage drawer switch 31 is connected to the step-up frequency converter 32, the medium-voltage frequency converter cabinet 33 and the wellhead junction box 34 in sequence. The wellhead junction box 34 is connected to the electric pump unit 5 and the heater 2 respectively through a cable 4.

[0021] The low-voltage drawer switch 31 is a 4000V low-voltage drawer switch 31 .

[0022] The wellhead junction box 34 is an explosion-proof junction box.

[0023] The cable 4 is connected to a quick connector 6 provided on the Christmas tree, and the quick connector 6 is respectively connected to the electric pump unit 5 and the heater 2 through two independent cables 4 .

[0024] The quick connector 6 is a plug-in quick connector.

[0025] The cable 4 and the heater 2 are connected via a Y connector 7 .

[0026] Heater 2 is a heating cable.

[0027] The heater 2 is arranged at the end of the oil pipe 1 .

[0028] The pre-pump viscosity reduction heating device comprises an oil pipe 1, a heater 2 and a power supply device 3. The oil pipe 1 is connected to the Christmas tree, the heater 2 is arranged on the oil pipe 1, the section of the oil pipe 1 where the heater 2 is arranged is a perforated circular pipe 11, the end of the perforated circular pipe 11 is provided with a perforated circular plug 12, and the heater 2 is cooperatively connected with the power supply device 3.

[0029] The power supply device 3 includes a low-voltage drawer switch 31, a step-up frequency converter 32, a medium-voltage frequency converter cabinet 33 and a wellhead junction box 34. The low-voltage drawer switch 31 is connected to the step-up frequency converter 32, the medium-voltage frequency converter cabinet 33 and the wellhead junction box 34 in sequence. The wellhead junction box 34 is connected to the electric pump unit 5 and the heater 2 respectively through a cable 4.

[0030] The low-voltage drawer switch 31 is a 4000V low-voltage drawer switch 31 .

[0031] The wellhead junction box 34 is an explosion-proof junction box.

[0032] The cable 4 is connected to a connector 6 provided on the Christmas tree, and the connector 6 is respectively connected to the electric pump unit 5 and the heater 2 through two independent cables 4 .

[0033] Connector 6 is a plug-in quick connector.

[0034] The cable 4 and the heater 2 are connected via a Y connector 7 .

[0035] Heater 2 is a heating cable.

[0036] The heater 2 is arranged at the end of the oil pipe 1 .

[0037] The working principle of the utility model is as follows: Figure 1 As shown, this solution realizes the function of heating the crude oil in the bottom of the wellbore through the heater 2. The heater 2 and the electric pump unit 5 are powered and controlled by the power supply device 3.

[0038] Preferably, the heating cable is a mineral cable heating cable. The mineral cable is a special heating cable with metal as the outer sheath, electric heating material as the heating element, and mineral as the insulation. When the current passes through the resistor, the resistance heating phenomenon occurs. The temperature of the conductor material rises and the resistance increases. When the temperature of the conductor material rises to a certain level, the resistance is so large that it almost blocks the current. The heating amount of the mineral cable heating is related to the working voltage, the cross-section of the heating core, and the length of the cable. Ultimately, the electrical energy is converted into thermal energy. The heat generated by the heating cable increases the temperature of the crude oil in the oil pipeline and reduces the viscosity.

[0039] In this embodiment, the heating cable, i.e., the mineral cable, is a special heating cable with metal as the outer sheath, electric heating material as the heating element, and mineral as the insulation. A heating cable with a line power of 1Kw / m is used to increase the contact time between the cable and the fluid and improve the heating effect of the fluid; its advantages are low requirements for heating equipment, which is similar to the cable structure; high working voltage, which can realize high-power electric heating; and high heat conversion efficiency of resistance heating.

[0040] Preferably, the power supply device 3 is connected to the low-voltage side of the transformer using a 400V low-voltage disk drawer switch, and the low-voltage drawer switch 31 increases the voltage to about 1000V through a step-up frequency converter 32; the high-voltage side of the transformer is connected to a medium-voltage frequency conversion cabinet 33, so that the output voltage and current and other parameters can be adjusted in time according to the downhole temperature feedback to reduce the waste of electric energy. It has better energy-saving effect than the power frequency cabinet. A wellhead junction box 34 is arranged next to the wellhead Christmas tree. The wellhead junction box 34 adopts an explosion-proof junction box. The explosion-proof junction box is connected to the Christmas tree through a cable 4. Two plug-in quick connectors 6 are installed on the Christmas tree. The quick connectors 6 are respectively connected to the heater 2 and the electric pump unit 5, so as to send power to the downhole electric heating cable, heat the heavy oil in front of the pump through the heating cable, and finally achieve the effect of heating the heavy oil. The transmission power cable and the electric pump cable are two independent power supply cables, that is, the electric submersible pump and the electric heating equipment in front of the pump have two cables for power transmission, and the two cables are independent of each other and do not interfere with each other.

[0041] The power transmission cable on the pump does not generate heat, and the electric heating cable is under the pump. The cable has a built-in temperature measuring optical fiber to achieve temperature control and safety protection.

[0042] Preferably, the oil pipe 1 adopts a bypass pipe design, and the heating pipe string part adopts a perforated round pipe 11 and a perforated round plug 12 for use in combination, which effectively increases the contact between the well fluid and the heating cable, making the heating more direct and the effect better.

[0043] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. The pre-pump viscosity reduction heating device is characterized by: It includes an oil pipe, a heater and a power supply device. The oil pipe is connected to the Christmas tree. The heater is arranged on the oil pipe. The oil pipe section where the heater is arranged is a round pipe with holes. The end of the round pipe with holes is provided with a round plug with holes. The heater is connected with the power supply device.

2. The pre-pump viscosity reduction heating device according to claim 1 is characterized in that: The power supply device includes a low-voltage drawer switch, a step-up frequency converter, a medium-voltage frequency converter cabinet and a wellhead junction box. The low-voltage drawer switch is connected to the step-up frequency converter, the medium-voltage frequency converter cabinet and the wellhead junction box in sequence. The wellhead junction box is connected to the electric pump unit and the heater through cables.

3. The pre-pump viscosity reduction heating device according to claim 2 is characterized in that: The low-voltage drawer switch is a 4000V low-voltage drawer switch.

4. The pre-pump viscosity reduction heating device according to claim 2 is characterized in that: The wellhead junction box is an explosion-proof junction box.

5. The pre-pump viscosity reduction heating device according to claim 2 is characterized in that: The cable is connected to a quick connector arranged on the Christmas tree, and the quick connector is respectively connected to the electric pump unit and the heater through two independent cables.

6. The pre-pump viscosity reduction heating device according to claim 5, characterized in that: The quick connector is a plug-in quick connector.

7. The pre-pump viscosity reduction heating device according to claim 2 is characterized in that: The cable and the heater are connected via a Y connector.

8. The pre-pump viscosity reduction heating device according to claim 1 is characterized in that: The heater is a heating cable.

9. The pre-pump viscosity reduction heating device according to claim 1, characterized in that: The heater is arranged at the end of the oil pipe.

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