Oil field well head heating and deicing system

Abstract

The utility model belongs to the technical field of stepped efficient functions, and discloses an oil field well head heating and deicing system which comprises a solar heat collector and a well head heating cover, the well head heating cover is provided with a heat preservation shell, and well head equipment and fused salt heat storage equipment are arranged in the heat preservation shell; the fused salt heat storage equipment is provided with an inlet pipeline and an outlet pipeline; the solar heat collector is respectively connected with the inlet pipeline and the outlet pipeline through pipelines; the fused salt heat storage equipment is provided with a heat preservation layer. Heat storage fused salt is arranged in the heat preservation layer, and gaps are reserved between the heat storage fused salt and the top and the bottom of the heat preservation layer; a heat exchange pipeline is inserted into the heat storage fused salt, and the two ends of the heat exchange pipeline extend out of the top and the bottom of the heat storage fused salt correspondingly; the inlet pipeline extends into the top of the insulating layer, and the outlet pipeline extends into the bottom of the insulating layer. Fused salt energy storage equipment is used for being coupled with the solar heat collector, heat storage and heat dissipation are integrated, and long-term uninterrupted efficient heat exchange of the system without manual operation is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cascade high-efficiency functions, and in particular relates to an oilfield wellhead heating and deicing system. Background Art

[0002] In cold weather, oil in oilfield wellheads and pipelines can solidify or freeze, disrupting production. Wellhead heating and deicing technology can effectively address this problem. By heating the wellhead and pipeline, it reduces oil viscosity and flow resistance, ensuring normal oil flow and safeguarding oilfield production, thereby increasing oil output and production efficiency. Existing oilfield wellhead heating equipment uses electric heating heaters to address winter freezing and thawing issues. However, electric heating is unstable in field use and requires regular maintenance, which increases personnel costs and is uneconomical.

[0003] Chinese patent publication number CN110068155A, titled "A Molten Salt Linear Fresnel Collector Field Anti-Condensation System and Method Thereof," comprises a high-positioned molten salt expansion tank, a linear Fresnel collector field, a low-temperature molten salt tank, a high-temperature molten salt tank, and a molten salt heating unit. The molten salt outlet of the molten salt expansion tank is connected to the molten salt inlet of the molten salt heating unit via an expansion tank outlet pipe, and the molten salt outlet of the molten salt heating unit is connected to the molten salt inlet of the linear Fresnel collector field via a heater outlet pipe. Although this patent application uses molten salt for energy storage, it cannot achieve long-term, continuous, and efficient heat exchange. Utility Model Content

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an oilfield wellhead heating and de-icing system, which uses molten salt energy storage equipment coupled with solar collectors to integrate heat storage and heat dissipation, thereby realizing uninterrupted and efficient heat exchange without long-term unmanned operation of the system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An oilfield wellhead heating and deicing system comprises: a solar collector and a wellhead heating cover, the wellhead heating cover having an insulating shell, the insulating shell containing wellhead equipment and molten salt heat storage equipment; the molten salt heat storage equipment having an inlet pipe and an outlet pipe; the solar collector being connected to the inlet pipe and the outlet pipe respectively via pipes; the molten salt heat storage equipment having an insulating layer; the insulating layer containing molten heat storage salt, with gaps between the molten heat storage salt and the top and bottom of the insulating layer; a heat exchange pipe being inserted into the molten heat storage salt, with both ends of the heat exchange pipe extending from the top and bottom of the molten heat storage salt respectively; the inlet pipe extending into the top of the insulating layer, and the outlet pipe extending into the bottom of the insulating layer.

[0007] Optionally, a delivery pump is provided on the pipeline connecting the solar thermal collector and the molten salt heat storage device.

[0008] Optionally, a partition is provided at the bottom of the heat storage molten salt.

[0009] Optionally, an electric heater is provided in the gap between the bottom of the heat storage molten salt and the bottom of the insulation layer.

[0010] Optionally, a temperature sensor is provided on a side of the top of the heat-insulating shell away from the molten salt heat storage device, and the temperature sensor is electrically connected to the electric heater.

[0011] Optionally, a detection port is provided on the side of the heat-insulating shell away from the molten salt heat storage equipment.

[0012] Optionally, a base is provided at the inner bottom of the heat-insulating shell, and the molten salt heat storage equipment and the wellhead equipment are both provided on the top of the base; the base is made of heat-insulating material.

[0013] Optionally, the solar collector has a cleaning device, which includes a surface dirt detection device, a cleaning motor and a cleaning brush. The solar collector has multiple solar heating tubes, and a sliding rod is provided in the middle of the outer side of the solar collector. The cleaning brush is slidably installed on the sliding rod, and the cleaning brush is connected to the cleaning motor through a transmission mechanism; the surface dirt detection device is provided at the end of the solar collector and is electrically connected to the cleaning motor.

[0014] Optionally, the thickness of the insulation layer on the surface facing the wellhead equipment in the molten salt heat storage device is smaller than the thickness of the insulation layer on other surfaces.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model discloses an oilfield wellhead heating and de-icing system, which is based on molten salt energy storage and connected to a solar collector to achieve a closed cycle of the system and reduce the waste of the intermediate heat exchange medium. The molten salt heat storage equipment and the wellhead equipment are arranged in the wellhead heating cover, and heat is conducted inside the wellhead heating cover to reduce heat loss. The utility model provides an insulation layer outside the wellhead heating cover to prevent heat conduction into the atmosphere. The utility model adopts a heat exchange pipe to enhance the heat exchange coefficient between the intermediate heat exchange medium and the heat storage molten salt, and can realize the integration of heat storage and heat dissipation.

[0017] Furthermore, the present invention uses an electric heater to prevent the wellhead equipment from freezing due to continuous extreme cold weather. The angle of the solar collector is automatically adjusted to ensure the maximum efficiency of sunlight absorption.

[0018] Furthermore, the surface of the solar collector of the utility model is provided with a cleaning device, which detects adverse factors on the surface of the solar collector that affect the efficiency of the solar collector through the dirt detection device, and cleans the surface of the solar collector by driving the cleaning brush through the cleaning motor to ensure that the efficiency of the solar collector is not affected.

[0019] Furthermore, a temperature sensor is provided on the top of the wellhead equipment side of the utility model wellhead heating cover and is connected to the electric heater control. The temperature is lowest here in the whole wellhead heating cover as a measuring point to ensure that the temperature of the whole wellhead equipment is within the required range.

[0020] Furthermore, a detection port is provided on the wellhead equipment side of the wellhead heating cover of the utility model, so that the wellhead equipment can be detected and switched on and off without removing the wellhead heating cover.

[0021] Furthermore, the wellhead heating cover of the present invention is installed on a base with a heat-insulating function, which can prevent heat from being introduced into the formation.

[0022] Furthermore, the insulation materials around the molten salt heat storage device of the present invention are arranged with different thicknesses, so that more heat is introduced into the wellhead equipment side, ensuring that the wellhead equipment is not frozen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are merely schematic and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the molten salt heat storage device of the utility model;

[0026] Among them, 1. Solar collector; 2. Cleaning device; 201. Surface dirt detection device; 202. Cleaning motor; 203. Cleaning brush; 3. Molten salt heat storage equipment; 301. Inlet pipe; 302. Heat exchange pipe; 303. Heat storage molten salt; 304. Electric heater; 305. Outlet pipe; 306. Insulation layer; 4. Wellhead equipment; 5. Wellhead heating cover; 501. Detection port; 502. Insulation shell; 6. Delivery pump; 7. Base; 8. Temperature sensor. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The present invention will be described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, an oilfield wellhead heating and deicing system of the present invention includes: a solar collector 1 and a wellhead heating cover 5 , wherein the wellhead heating cover 5 has a heat-insulating shell 502 .

[0032] The insulation shell 502 contains a wellhead device 4 and a molten salt heat storage device 3; the molten salt heat storage device 3 has an inlet pipe 301 and an outlet pipe 305; the solar collector 1 is connected to the inlet pipe 301 and the outlet pipe 305 respectively through pipes; the molten salt heat storage device 3 has an insulation layer 306.

[0033] The insulation layer 306 contains a heat storage molten salt 303, and gaps are left between the heat storage molten salt 303 and the top and bottom of the insulation layer 306; a heat exchange pipe 302 is inserted into the heat storage molten salt 303, and the two ends of the heat exchange pipe 302 extend from the top and bottom of the heat storage molten salt 303 respectively; the inlet pipe 301 extends into the top of the insulation layer 306, and the outlet pipe 305 extends into the bottom of the insulation layer 306.

[0034] A partition is provided at the bottom of the heat storage molten salt 303. An electric heater 304 is provided in the gap between the bottom of the heat storage molten salt 303 and the bottom of the insulation layer 306.

[0035] The solar thermal collector 1 has a cleaning device 2 .

[0036] A detection port 501 is provided on the side of the heat-insulating shell 502 away from the molten salt heat storage device 3 .

[0037] A base 7 is provided at the inner bottom of the heat-insulating shell 502 , and the molten salt heat storage device 3 and the wellhead device 4 are both provided on top of the base 7 .

[0038] Example 1

[0039] An oilfield wellhead heating and deicing system includes a solar collector 1 and a wellhead heating cover 5. The wellhead heating cover 5 has an insulating shell 502, which contains wellhead equipment 4 and a molten salt heat storage device 3. The solar collector 1 has a cleaning device 2, which includes a surface dirt detection device 201, a cleaning motor 202, and a cleaning brush 203.

[0040] The solar thermal collector 1 has a plurality of solar heating tubes therein.

[0041] Optionally, a sliding rod is provided at the middle portion of the outer side of the solar thermal collector 1, and the cleaning brush 203 is slidably mounted on the sliding rod. The surface dirt detection device 201 is provided at the end of the solar thermal collector 1 and is electrically connected to the cleaning motor 202. The cleaning brush 203 is connected to the cleaning motor 202 via a chain.

[0042] Optionally, the cleaning motor 202 is a linear motor with a slider, and the cleaning brush 203 is mounted on the slider.

[0043] The thermal insulation layer 306 is made of a heat-insulating material. Optionally, the thermal insulation layer 306 is made of aluminum silicate fiber cotton.

[0044] The heat-insulating shell 502 is made of a material with low thermal conductivity. Optionally, the heat-insulating shell 502 is made of glass fiber reinforced plastic.

[0045] The solar collector 1 has multiple solar heating tubes connected to the molten salt heat storage device 3 via pipes. An intermediate heat exchange medium is contained within the solar heating tubes. The intermediate heat exchange medium is a low-temperature resistant intermediate heat exchange medium. Specifically, the intermediate heat exchange medium is a low-temperature resistant medium. Optionally, the intermediate heat exchange medium is ethylene glycol, brine, or dichloromethane, which can prevent the intermediate heat exchange medium from freezing in extreme cold weather.

[0046] A sliding rod is provided in the middle of the outer side of the solar collector 1, with the solar heating tubes arranged on either side of the rod. A cleaning brush 203 is slidably mounted on the rod and connected to a cleaning motor 202 via a chain. A surface dirt detection device 201 is provided at the end of the solar collector 1 and is electrically connected to the cleaning motor 202. The dirt detection device can detect dust, snow, or rain on the surface of the solar collector 1, preventing it from affecting the solar collector's heat collection efficiency.

[0047] When the surface dirt detection device 201 detects that dust, snow and rainwater have accumulated on the surface of the solar collector 1 to a certain extent, the cleaning motor 202 starts to drive the cleaning brush 203 to move up and down to clean the dust, snow and rainwater accumulated on the surface.

[0048] The solar collector 1 is equipped with sensors and a control system. The sensors can detect the sun's position and light intensity in real time and transmit this information to the control system. Based on this information, the control system calculates the required angle and direction of the solar collector 1 and uses an internal drive mechanism to automatically rotate the photovoltaic panels, ensuring that the solar collector 1 always faces the sun.

[0049] The molten salt heat storage device 3 has an inlet pipe 301 and an outlet pipe 305; the solar collector 1 is connected to the inlet pipe 301 and the outlet pipe 305 through pipes respectively.

[0050] Preferably, the outlet pipe 305 is a curved pipe inside the insulation layer 306 , and the end thereof faces the bottom of the insulation layer 306 , so as to make full use of the intermediate heat exchange medium and avoid the intermediate heat exchange medium from being unable to be extracted.

[0051] Specifically, a delivery pump 6 is provided on the pipeline connecting the solar thermal collector 1 and the molten salt heat storage device 3 .

[0052] Specifically, the top of the solar thermal collector 1 is provided with an outflow pipe on both sides respectively, the bottom of the solar thermal collector 1 is provided with an inflow pipe, and the delivery pump 6 is arranged on the pipe connecting the inflow pipe and the molten salt heat storage device 3.

[0053] The molten salt heat storage device 3 includes an insulation layer 306; within this insulation layer 306 lies a heat storage molten salt 303, with gaps between the top and bottom of the insulation layer 306. A heat exchange pipe 302 is inserted into the molten salt 303, with its ends extending from the top and bottom of the molten salt 303, respectively. The inlet pipe 301 extends into the top of the insulation layer 306, and the outlet pipe 305 extends into the bottom of the insulation layer 306. The use of a heat exchange pipe 302 with high heat exchange efficiency enhances the heat exchange coefficient between the intermediate heat exchange medium and the molten salt 303.

[0054] Furthermore, the heat exchange pipe 302 has finned tubes with increased heat exchange area, which can enhance its heat exchange efficiency.

[0055] Preferably, the thickness of the insulation layer 306 on the side facing the wellhead device 4 is thinner than on the side facing away from the wellhead device 4, so that more heat is introduced into the wellhead device 4 to prevent the wellhead device from freezing. Testing at the lowest temperature point in the entire wellhead heating cover 5 can ensure that the temperature of the entire wellhead device 4 is within the required range.

[0056] Specifically, the thickness of the insulation layer 306 on the surface facing the wellhead device 4 in the molten salt heat storage device 3 is smaller than the thickness of the insulation layer 306 on other surfaces.

[0057] Specifically, there are two heat exchange pipes 302 and they are arranged in parallel.

[0058] Specifically, a partition is provided at the bottom of the heat storage molten salt 303. Optionally, a partition is provided at the top of the heat storage molten salt 303. The partition is fixedly connected to the inner wall of the insulation layer 306, and both ends of the heat exchange pipe 302 pass through the partition.

[0059] An electric heater 304 is installed in the gap between the bottom of the molten salt storage device 303 and the bottom of the insulation layer 306. A temperature sensor 8 is installed on the top of the insulation shell 502, away from the molten salt heat storage device 3. This temperature sensor 8 is electrically connected to the electric heater 304. The electric heater 304 prevents freezing of the wellhead equipment 4 due to continuous, extreme cold weather.

[0060] The side of the heat-insulating shell 502 away from the molten salt heat storage device 3 is provided with a detection port 501 , which can detect and switch the wellhead device 4 without removing the wellhead heating cover 5 .

[0061] Specifically, the detection port 501 is a manhole door.

[0062] The inner bottom of the heat-insulating shell 502 is provided with a base 7, and the molten salt heat storage device 3 and the wellhead device 4 are both provided on top of the base 7. The base 7 can prevent heat from being introduced into the formation.

[0063] Example 2

[0064] The utility model discloses an oilfield wellhead heating and deicing system, which, when in use, comprises the following steps:

[0065] The intermediate heat exchange medium is charged into the solar thermal collector 1 for heating.

[0066] The heated intermediate heat exchange medium in the solar collector 1 is introduced into the inlet pipe 301 from both ends through the outflow pipe, and is sent into the insulation layer 306, and the heat is stored in the heat storage molten salt 303 through the heat exchange pipe 302, and the wellhead equipment 4 is heated by the heat storage molten salt 303 that stores heat.

[0067] The intermediate heat exchange medium is pumped into the inlet pipe of the solar collector 1 through the outlet pipe 305 by the delivery pump 6, thereby realizing a closed circulation of the system and reducing the waste of the intermediate heat exchange medium.

[0068] When the temperature sensor 8 detects that the temperature is too low, the electric heater 304 is started to prevent the intermediate heat exchange medium from freezing. When the surface dirt detection device 201 detects that there is dirt on the surface of the solar collector 1, the cleaning motor 202 is started to remove the dirt through the cleaning brush 203.

[0069] Unless otherwise specified, the device components involved in the above embodiments are all conventional device components, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An oilfield wellhead heating and deicing system, characterized in that: include: A solar heat collector (1) and a wellhead heating cover (5), wherein the wellhead heating cover (5) has a heat-insulating shell (502), and the heat-insulating shell (502) has a wellhead device (4) and a molten salt heat storage device (3); the molten salt heat storage device (3) has an inlet pipe (301) and an outlet pipe (305); the solar heat collector (1) is connected to the inlet pipe (301) and the outlet pipe (305) respectively through pipes; the molten salt heat storage device (3) has an insulation layer (306 ); the thermal insulation layer (306) contains a heat storage molten salt (303), and gaps are left between the top and bottom of the thermal insulation layer (306) and the thermal insulation layer (306); a heat exchange pipe (302) is inserted into the thermal insulation layer (303), and the two ends of the heat exchange pipe (302) extend from the top and bottom of the thermal insulation layer (303) respectively; the inlet pipe (301) extends into the top of the thermal insulation layer (306), and the outlet pipe (305) extends into the bottom of the thermal insulation layer (306).

2. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: A delivery pump (6) is provided on the pipeline connecting the solar thermal collector (1) and the molten salt heat storage device (3).

3. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: A partition is provided at the bottom of the heat storage molten salt (303).

4. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: An electric heater (304) is provided in the gap between the bottom of the heat storage molten salt (303) and the bottom of the insulation layer (306).

5. The oilfield wellhead heating and deicing system according to claim 4, characterized in that: A temperature sensor (8) is provided on a side of the top of the heat-insulating shell (502) away from the molten salt heat storage device (3), and the temperature sensor (8) is electrically connected to the electric heater (304).

6. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: A detection port (501) is provided on the side of the heat-insulating shell (502) away from the molten salt heat storage device (3).

7. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: A base (7) is provided at the inner bottom of the heat-insulating shell (502), and the molten salt heat storage device (3) and the wellhead device (4) are both provided on top of the base (7); the base (7) is made of a heat-insulating material.

8. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: The solar thermal collector (1) has a cleaning device (2), the cleaning device (2) comprising a surface dirt detection device (201), a cleaning motor (202) and a cleaning brush (203); a plurality of solar heating tubes are provided in the solar thermal collector (1); a sliding rod is provided at the middle of the outer side of the solar thermal collector (1); the cleaning brush (203) is slidably mounted on the sliding rod; the cleaning brush (203) and the cleaning motor (202) are connected via a transmission mechanism; the surface dirt detection device (201) is provided at the end of the solar thermal collector (1) and is electrically connected to the cleaning motor (202).

9. The oilfield wellhead heating and deicing system according to claim 1, characterized in that: The thickness of the insulation layer (306) on the surface of the molten salt heat storage device (3) facing the wellhead device (4) is smaller than the thickness of the insulation layer (306) on other surfaces.

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