CN110644961B

CN110644961B - Intelligent heating device for hot fluid of oil well

Info

Publication number: CN110644961B
Application number: CN201911004095.3A
Authority: CN
Inventors: 赵可
Original assignee: JINYU ENTERPRISE GROUP Corp OF LIAOHE OIL FIELD PANJIN
Current assignee: JINYU ENTERPRISE GROUP Corp OF LIAOHE OIL FIELD PANJIN
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-06-09
Anticipated expiration: 2039-10-22
Also published as: CN110644961A

Abstract

The invention relates to the technical field of oil extraction engineering, and discloses an intelligent heating device for hot fluid of an oil well. When the intelligent heating device for the hot fluid of the oil well is used for oil extraction, the continuously circulated fluid can continuously convey heat generated by burning natural gas in a stratum into the oil well and transfer the heat to crude oil in a second annular space, so that the oil well can be smoothly exploited; and the annular space in a vacuum state is arranged in the inner pipe, so that the heat loss of the fluid in the process of flowing downwards along the inner pipe can be effectively reduced, and the efficient heat transfer to the crude oil is realized, so that the intelligent heating device for the oil well hot fluid can fully utilize natural gas in the stratum to realize the efficient and low-cost exploitation of the heavy oil and the ultra-heavy oil.

Description

Intelligent heating device for hot fluid of oil well

Technical Field

The invention relates to the technical field of oil extraction engineering, in particular to an intelligent heating device for hot fluid of an oil well.

Background

In recent years, with continuous exploitation of oil fields, the yield of thin oil wells is less and less, so that heavy oil and super heavy oil become the key points of exploitation. However, because the viscosity of the thick oil and the super thick oil is high, the thick oil and the super thick oil cannot be collected from the oil well smoothly, and the exploitation and the utilization of the thick oil and the super thick oil are greatly restricted.

In order to make viscous crude and super viscous crude gather from the oil well smoothly, utility model patent CN204804801U discloses an oil well hot-fluid intelligence heating device, and it is through inserting concentric interior insulating tube in the oil well, and the fluid after will being heated by the heater pours into the oil well into through concentric interior insulating tube, thereby reduces its viscosity and produces smoothly for the crude (including viscous crude and super viscous crude) in the oil well with the heat transfer that the fluid carried. However, in the actual use process, the device has the following problems: although the concentric inner heat-insulating pipe is wrapped with the heat-insulating material, the current heat-insulating material cannot effectively insulate heat of fluid in the concentric inner heat-insulating pipe due to the fact that an oil well is deep and pressure change is large, and heat loss of the fluid in the process of flowing in the concentric inner heat-insulating pipe is large, and heat cannot be effectively transferred to crude oil.

Disclosure of Invention

The invention aims to provide an intelligent heating device for oil well hot fluid, which at least solves the problems.

In order to achieve the above object, the present invention provides an intelligent heating device for oil well thermal fluid, comprising:

the oil pipe is coaxially inserted into an oil well extending in the vertical direction, and a radial gap is formed between the oil pipe and the oil well to form a first annular space;

the fluid circulation pipe is coaxially inserted into the oil pipe, a radial gap is formed between the fluid circulation pipe and the oil pipe to form a second annular space, the fluid circulation pipe comprises an inner pipe and an outer pipe which are coaxially sleeved, a radial gap is formed between the inner pipe and the outer pipe to form a third annular space, the third annular space is arranged to be communicated with the inner pipe at the bottom end of the fluid circulation pipe, the inner pipe comprises a main pipe and a sleeve pipe, the sleeve pipe is coaxially sleeved outside the main pipe, two ends of the sleeve pipe are sealed on the outer wall of the main pipe to form a sealed annular space between the sleeve pipe and the main pipe, and the sealed annular space is in a vacuum state;

the fluid circulation heating system comprises a fluid storage tank, a heat exchanger, a circulating pump and a burner, wherein the fluid storage tank is used for storing fluid, a fluid outlet of the fluid storage tank is communicated with a fluid inlet of the heat exchanger, the circulating pump is arranged on a communicating pipeline between the fluid outlet of the fluid storage tank and the fluid inlet of the heat exchanger and used for circularly pumping the fluid in the fluid storage tank to the heat exchanger, the fluid outlet of the heat exchanger is communicated with the inner pipe, the fluid inlet of the fluid storage tank is communicated with the third annular space, an air inlet of the burner is communicated with the first annular space so as to generate heat by using natural gas in the first annular space, and the burner is arranged to transmit the generated heat to the fluid through the heat exchanger; and

the pumping unit comprises a pumping rod and a pumping piston, the pumping piston is arranged in the pumping pipe in a sealing mode and is connected below the fluid circulation pipe, the top end of the fluid circulation pipe is connected to the pumping rod, the fluid circulation pipe and the pumping piston can be driven by the pumping rod to move up and down along the axial direction of the pumping pipe, and the pumping piston is provided with an oil passing hole which is used for communicating the cavity below the pumping piston of the pumping pipe with the second annulus.

Optionally, the intelligent heating device for oil well hot fluid comprises a connecting piece for connecting the fluid circulation pipe and the oil pumping piston, the upper end of the connecting piece comprises a cavity with a top opening, a peripheral wall and a bottom wall for limiting the cavity, an external thread for being in threaded connection with the lower end of the outer pipe is arranged on the outer surface of the peripheral wall, and the bottom end of the inner pipe is inserted into the cavity through the top opening and is spaced from the bottom wall so as to be communicated with the third annulus through the cavity.

Alternatively, the bottom wall is formed in an inverted cone shape having an apex on the central axis of the inner tube.

Optionally, the fluid circulation tube includes a fixing bracket installed in the outer tube and used for supporting the lower end of the inner tube, the fixing bracket is located above the connecting piece, and a through hole for inserting the lower end of the inner tube and a communication hole for communicating the cavity with the third annulus are formed in the fixing bracket.

Optionally, the intelligent heating device for oil well thermal fluid comprises a connecting rod, the lower end of the connecting piece is provided with a plug hole for the upper end of the connecting rod to be plugged, and the lower end of the connecting rod is connected to the oil pumping piston.

Optionally, the intelligent heating device for hot fluid in the oil well comprises a first communicating piece, the first communicating piece is mounted at the top end of the fluid circulation pipe, a first communicating port used for communicating the inner pipe with a fluid outlet of the heat exchanger and a second communicating port used for communicating the third annulus with a fluid inlet of the fluid storage tank are arranged on the first communicating piece, and the fluid circulation pipe is connected to the sucker rod through the first communicating piece; and/or

The intelligent heating device for the hot fluid of the oil well comprises a second communicating piece, a gas storage tank and an oil storage tank, wherein the second communicating piece is installed at the top end of the oil well, the second communicating piece is provided with a first communicating valve used for communicating the first annular space with the gas inlet of the burner, a third communicating valve used for communicating the first annular space with the second communicating valve of the gas inlet of the gas storage tank and a third communicating valve used for communicating the second annular space with the oil inlet of the oil storage tank.

Optionally, the fluid circulation heating system comprises a first filter and a check valve which are arranged on a communication pipeline between the liquid outlet of the liquid storage tank and the liquid inlet of the heat exchanger; and/or

The fluid circulation heating system comprises a gas distribution bag, wherein the gas distribution bag is arranged on a communication pipeline between the gas inlet of the burner and the first annular space and is used for supplying natural gas from the first annular space to the burner after separation and purification.

Optionally, the fluid circulation heating system comprises a temperature sensor, a pressure sensor and a pressure switch arranged on a communication pipeline between the liquid outlet of the heat exchanger and the inner pipe, and/or

Fluid circulation heating system including set up in first annular space with second filter and quick action emergency valve on the intercommunication pipeline between the air inlet of minute gas package, and set up in the gas outlet of minute gas package with first manometer, relief pressure valve and second manometer on the intercommunication pipeline between the air inlet of combustor, wherein, first manometer is used for detecting the gas outlet pressure of minute gas package, the second manometer is used for detecting the gas working pressure of combustor.

Optionally, a safety valve, a pressure relief valve, a blowdown valve, a liquid level meter and a liquid supplementing port are arranged on the liquid storage tank; and/or

The fluid circulation heating system comprises a temperature switch, a combustible gas detector and a flame detector, wherein the temperature switch, the combustible gas detector and the flame detector are connected with the emergency cut-off valve, the temperature switch is set to control the emergency cut-off valve to be closed when the temperature of the liquid discharged from the heat exchanger exceeds a preset value, the combustible gas detector is set to control the emergency cut-off valve to be closed when natural gas leakage is detected, and the flame detector is set to control the emergency cut-off valve to be closed when open fire is detected.

Optionally, the intelligent heating device for oil well thermal fluid comprises a control system, the control system is arranged to be electrically connected with the burner and the circulating pump to control the operation of the burner and the circulating pump, and the control system is arranged to be electrically connected with the temperature sensor, the pressure sensor, the first pressure gauge and the second pressure gauge respectively.

By the technical scheme, when the intelligent heating device for the hot fluid of the oil well is used for oil extraction, natural gas entering the first annular space from a stratum can enter the combustor to be combusted to generate heat, the generated heat enters the heat exchanger and is transferred to the fluid flowing through the heat exchanger, so that the fluid is heated, the heated fluid enters the inner tube and flows downwards along the inner tube, flows to the bottom end of the inner tube and then enters the third annular space and returns upwards along the third annular space, the carried heat can be transferred to crude oil in the second annular space in the process of returning upwards of the fluid to reduce the viscosity of the crude oil so as to be smoothly extracted, and the cooled fluid returns to the liquid storage tank to carry out the next heat carrying cycle; and the annular space in a vacuum state is arranged in the inner pipe, so that the heat loss of the fluid in the process of flowing downwards along the inner pipe can be effectively reduced, and the efficient heat transfer to the crude oil is realized, so that the intelligent heating device for the oil well hot fluid can fully utilize natural gas in the stratum to realize the efficient and low-cost exploitation of the heavy oil and the ultra-heavy oil.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an embodiment of the intelligent well thermal fluid heating apparatus of the present invention;

FIG. 2 is a schematic structural view of one embodiment of a fluid circulation tube in the present invention;

FIG. 3 is a schematic view showing the connection of two fluid circulation tubes of FIG. 2;

FIG. 4 is a schematic structural view of another embodiment of the fluid circulation tube in the present invention;

FIG. 5 is a schematic view showing the connection of two fluid circulation tubes of FIG. 4;

FIG. 6 is a schematic view showing the connection of the fluid circulation tube of FIG. 2 with the connection member and the connection rod;

FIG. 7 is a schematic view of a gas fired system of the fluid circulation heating system of the present invention;

fig. 8 is a schematic view of a fluid circulation system in the fluid circulation heating system of the present invention.

Description of the reference numerals

10-oil well, 11-oil pipe, 12-fluid circulation pipe, 121-inner pipe, 1211-main pipe, 1212-sleeve pipe, 122-outer pipe, 123-insulating layer, 124-fixing support, 1241-communicating hole, 125-sealing support, 126-first sealing ring, 13-oil pumping unit, 131-oil pumping rod, 132-oil pumping piston, 1321-oil passing hole, 14-connecting piece, 141-cavity, 142-peripheral wall, 143-bottom wall, 144-inserting hole, 145-second sealing ring, 15-connecting rod, 16-first connecting piece, 161-first connecting port, 162-second connecting port, 17-second connecting piece, 171-first connecting valve, 172-second connecting valve, 173-third connecting valve, 174-sealer, 18-gas storage tank, 19-oil storage tank, 20-fluid circulation heating system, 21-liquid storage tank, 211-safety valve, 212-pressure relief valve, 213-blow-down valve, 214-liquid level meter, 215-liquid supplement port, 216-blow-down valve, 217-pressure gauge, 22-valve, 221-first filter, 222-circulation pump, 223-check valve, 23-heat exchanger, 231-explosion-proof membrane, 241-temperature sensor, 242-pressure sensor, 243-pressure switch, 244-pressure gauge, 25-second filter, 26-emergency cut-off valve, 261-temperature switch, 262-combustible gas detector, 263-flame detector, 27-gas distribution bag, 271-blow-down port, 272-first pressure gauge, 273-pressure relief valve, 274-gauge, 275-second pressure gauge, 28-burner.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, top, and bottom" are generally used to refer to the orientation in the mounted and used state. "inner and outer" refer to the inner and outer contours of the respective component itself.

The invention provides an intelligent heating device for oil well hot fluid, which comprises:

the oil pipe 11 is coaxially inserted into the oil well 10 extending in the vertical direction, and a radial gap is formed between the oil pipe 11 and the oil well 10 to form a first annular space;

the fluid circulation pipe 12 is coaxially inserted into the oil pipe 11, a radial gap is formed between the fluid circulation pipe 12 and the oil pipe 11 to form a second annular space, the fluid circulation pipe 12 comprises an inner pipe 121 and an outer pipe 122 which are coaxially sleeved, a radial gap is formed between the inner pipe 121 and the outer pipe 122 to form a third annular space, the third annular space is arranged to be communicated with the inner pipe 121 at the bottom end of the fluid circulation pipe 12, the inner pipe 121 comprises a main pipe 1211 and a sleeve 1212, the sleeve 1212 is coaxially sleeved outside the main pipe 1211, two ends of the sleeve 1212 are sealed on the outer wall of the main pipe 1211 to form a sealed annular space between the sleeve 1212 and the main pipe 1211, and the sealed annular space is in a vacuum state;

the fluid circulation heating system 20 comprises a fluid storage tank 21, a heat exchanger 23, a circulation pump 222 and a burner 28, wherein the fluid storage tank 21 is used for storing fluid, a fluid outlet of the fluid storage tank 21 is communicated with a fluid inlet of the heat exchanger 23, the circulation pump 222 is arranged on a communication line between the fluid outlet of the fluid storage tank 21 and the fluid inlet of the heat exchanger 23 and used for circularly pumping the fluid in the fluid storage tank 21 to the heat exchanger 23, the fluid outlet of the heat exchanger 23 is communicated with the inner pipe 121, the fluid inlet of the fluid storage tank 21 is communicated with a third annular space, an air inlet of the burner 28 is communicated with the first annular space so as to utilize natural gas in the first annular space to perform combustion, and the heat-generating burner 28 is arranged; and

the pumping unit 13, the pumping unit 13 includes a pumping rod 131 and a pumping piston 132, the pumping piston 132 is hermetically disposed in the oil pipe 11 and connected to the lower portion of the fluid circulation pipe 12, the top end of the fluid circulation pipe 12 is connected to the pumping rod 131, the fluid circulation pipe 12 and the pumping piston 132 can move up and down along the axial direction of the oil pipe 11 under the driving of the pumping rod 131, and the pumping piston 132 is provided with an oil passing hole 1321 for communicating the cavity below the pumping piston 132 of the oil pipe 11 with the second annulus.

It should be noted that the oil pumping piston 132 hermetically disposed in the oil pipe 11 can divide the inner cavity of the oil pipe 11 into an upper cavity and a lower cavity, the fluid circulation pipe 12 is located in the upper cavity, and the mentioned "cavity of the oil pipe 11 located below the oil pumping piston 132" is the lower cavity, that is, the oil passing hole 1321 communicates the lower cavity and the upper cavity.

In the present invention, the fluid may be any liquid capable of carrying heat, such as softened water, antifreeze or conduction oil. Wherein, the cost of the softened water is lower, and the portable heat is more; the heat conduction oil has higher cost, can carry less heat than softened water, and is suitable for being used in an ultrahigh-temperature environment; the cost of the antifreeze is between that of softened water and heat conducting oil, the portable heat is the same as that of softened water, and the antifreeze is suitable for the environment with the temperature of about minus 30 ℃. In addition, to facilitate the installation of the inner tube 121 and the outer tube 122, the sleeve 1212 has a length smaller than that of the main tube 1211.

It can be understood that the intelligent heating device for oil well thermal fluid comprises three working processes: the first is the circulation of fluid, and the circulation path of the fluid is a liquid storage tank 21, a circulating pump 222, a heat exchanger 23, an inner pipe 121, a third annulus and the liquid storage tank 21; the second is the collection and combustion of natural gas, the natural gas in the first annular space enters a combustor 28 to be combusted to generate heat, and the generated heat is transferred to the fluid through a heat exchanger 23; the third is the collection of crude oil (including heavy oil and super heavy oil), the pumping rod 131 is driven to move upwards by the pumping unit 13, the pumping rod 131 will drive the fluid circulation pipe 12 and the pumping piston 132 to move upwards together to pump the crude oil in the formation into the oil pipe 11, the crude oil entering the oil pipe 11 further enters the second annulus through the oil passing hole 1321 on the pumping piston 132 to be produced upwards.

Through research, natural gas in a stratum can enter a first annular space between an oil pipe 11 and an oil well 10 in the oil extraction process, by adopting the intelligent heating device for the oil well hot fluid, during oil extraction, the natural gas in the first annular space can enter a combustor 28 to combust and generate heat, the generated heat enters a heat exchanger 23 to be transferred to fluid flowing through the heat exchanger 23, the fluid is heated, the heated fluid enters an inner pipe 121 to flow downwards along the inner pipe 121, flows to the bottom end of the inner pipe 121 and then enters a third annular space to return upwards along the third annular space, the carried heat can be transferred to crude oil in the second annular space in the process of returning the fluid so that the viscosity of the crude oil is reduced and the crude oil is successfully extracted, the cooled fluid returns to a liquid storage tank 21 to carry out the next heat carrying cycle, and the heat generated by natural gas combustion can be continuously transferred to the inside of the oil well by the fluid, the oil is transferred to the crude oil in the second annular space, so that the oil well can be smoothly exploited; and moreover, the annular space in a vacuum state is arranged in the inner pipe 121, so that heat loss of fluid in the process of flowing downwards along the inner pipe 121 can be effectively reduced, and efficient heat transfer to crude oil is realized, so that the intelligent heating device for the oil well hot fluid can fully utilize natural gas in the stratum to realize efficient and low-cost exploitation of thick oil and ultra-thick oil.

In the present invention, in order to reduce the heat loss of the fluid during the downward flow along the inner tube 121, in addition to the above-mentioned embodiment of the vacuum structure, an insulating layer 123 (see fig. 4) made of a new insulating material with good insulating effect may be directly disposed on the outer wall of the inner tube 121. Wherein, the new heat insulation material is a mixture of ceramic fiber hollow particles and glue.

In the present invention, the fluid circulation tube 12 may be a split structure (i.e. formed by inserting a plurality of small units) or an integral structure. In order to reduce the manufacturing cost of the fluid circulation pipe 12 and flexibly adapt to the depth of the oil well 10, the invention provides the following two preferred embodiments.

For example, in the split embodiment shown in fig. 2 and 3, the fluid circulation tube 12 of each unit includes an inner tube 121 and an outer tube 122, the left end of the inner tube 121 is fixedly supported in the left end of the outer tube 122 by a sealing bracket 125 (the sealing bracket 125 and the outer tube 122 may be connected by a screw thread, and the left end of the inner tube 121 may be in sealing insertion with the sealing bracket 125), the right end of the inner tube 121 is fixedly supported in the right end of the outer tube 122 by a fixing bracket 124 (the fixing bracket 124 and the outer tube 122 may be connected by a screw thread, and the right end of the inner tube 121 may be inserted into the fixing bracket 124 and welded to the fixing bracket 124), the left end of the outer tube 122 is formed as a small end, and the outer surface is sleeved; as shown in fig. 3, when the fluid circulation tubes 12 of the two units are inserted into each other, the small end of the right outer tube 122 is inserted into the large end of the left outer tube 122, the large end and the small end are sealed by the first sealing ring 126, the right end of the left inner tube 121 is inserted into the sealing bracket 125 of the right fluid circulation tube 12 in a sealing manner and is in butt joint communication with the left end of the right inner tube 121, and the sealing bracket 125 is provided with a through hole for communicating a third annulus of the left and right fluid circulation tubes 12.

For example, in the integrated embodiment shown in fig. 4 and 5, the fluid circulation tube 12 includes a whole inner tube 121 and a plurality of outer tubes 122, the left end of the outer tube 122 is formed as a small end, and a first sealing ring 126 is sleeved on the outer surface, the right end of the outer tube 122 is formed as a large end, when the two outer tubes 122 are inserted, the small end of the right outer tube 122 is inserted into the large end of the left outer tube 122, and the large end and the small end are sealed by the first sealing ring 126. In actual installation, a plurality of outer tubes 122 inserted into each other may be placed in the oil pipe 11, and then the inner tubes 121 may be inserted into the plurality of outer tubes 122.

In the present invention, in order to communicate the third annulus with the inner tube 121 at the bottom end of the fluid circulation tube 12 so that the fluid in the inner tube 121 smoothly enters the third annulus to go up and back, as shown in fig. 6, the intelligent heating device for oil well heating fluid may include a connecting member 14 for connecting the fluid circulation tube 12 with the oil pumping piston 132, the connecting member 14 may include a cavity 141 having a top opening, and a peripheral wall 142 and a bottom wall 143 for defining the cavity 141, an external thread for screwing with the lower end of the outer tube 122 is provided on the outer surface of the peripheral wall 142 (of course, an internal thread for fitting with the external thread is provided on the inner surface of the lower end of the outer tube 122), and the bottom end of the inner tube 121 is inserted into the cavity 141 through the top opening with a space from the bottom wall 143 to communicate. Wherein there is a radial gap between the inner tube 121 and the top opening of the connector 14. In use, fluid in the inner tube 121 flows to the bottom end of the inner tube 121, enters the cavity 141 through the bottom end opening, and then returns to the third annulus through the radial gap between the inner tube 121 and the top opening. In the above, the upper end of the connecting member 14 and the lower end of the outer tube 122 may be connected by a screw thread, and a second sealing ring 145 may be disposed between the upper end of the connecting member 14 and the lower end of the outer tube 122.

In the above, in order to further facilitate the upward and backward movement of the fluid and achieve efficient circulation of the fluid, as shown in fig. 6, the bottom wall 143 may be formed in a reverse conical shape having a vertex located on the central axis of the inner tube 121.

In the case that the fixing bracket 124 is installed in the fluid circulation tube 12, the fixing bracket 124 is located above the connection member 14, and a through hole for inserting the lower end of the inner tube 121 and a communication hole 1241 for communicating the cavity 141 with the third annulus are opened in the fixing bracket 124 (see fig. 6).

In the present invention, the connector 14 can directly connect the pumping piston 132 to the fluid circulation tube 12, that is, directly connect the pumping piston 132 to the lower end of the connector 14. In order to improve the flexibility and reliability of the connection between the fluid circulation tube 12, the connecting member 14, and the oil pumping piston 132 and provide a larger design space for each component, the connecting member 14 may also be connected to the oil pumping piston 132 through the connecting rod 15, as shown in fig. 6, an insertion hole 144 for inserting the upper end of the connecting rod 15 may be provided at the lower end of the connecting member 14, and the lower end of the connecting rod 15 is connected to the oil pumping piston 132. Wherein, the upper end of the connecting rod 15 can be connected with the inserting hole 144 through screw thread.

In the present invention, it is understood that the fluid circulation heating system 20 and the pumping unit 13 are located on the working platform on the ground. In order to realize the communication between the underground part and the above-ground part of the intelligent heating device for oil well thermal fluid, as shown in fig. 1, the intelligent heating device for oil well thermal fluid may comprise a first communicating member 16, the first communicating member 16 is installed at the top end of the fluid circulating pipe 12, the first communicating member 16 is provided with a first communicating port 161 for communicating the inner pipe 121 with the liquid outlet of the heat exchanger 23 and a second communicating port 162 for communicating the third annulus with the liquid inlet of the liquid storage tank 21, and the fluid circulating pipe 12 is connected to the sucker rod 131 through the first communicating member 16. In use, fluid discharged from the liquid outlet of the heat exchanger 23 enters the first communicating portion 16 through the first communicating port 161 and then enters the inner tube 121; fluid returning from the third annulus will enter the first communication member 16 and then enter the reservoir 21 through the second communication port 162 and the inlet of the reservoir 21 in sequence.

In addition, as shown in fig. 1, the intelligent heating device for oil well thermal fluid may further include a second communicating member 17, an air storage tank 18 and an oil storage tank 19, the second communicating member 17 is installed at the top end of the oil well 10, and the second communicating member 17 is provided with a first communicating valve 171 for communicating the first annulus with the air inlet of the burner 28, a second communicating valve 172 for communicating the first annulus with the air inlet of the air storage tank 18 and a third communicating valve 173 for communicating the second annulus with the oil inlet of the oil storage tank 19. With the arrangement, the redundant natural gas collected from the first annulus can be stored in the gas storage tank 18 for other oil wells, and of course, the gas inlet of the burner 28 can also be communicated with the gas outlet of the gas storage tank 18; the crude oil collected from the second annulus may be stored to a storage tank 19 for subsequent processing and use.

Among them, as shown in fig. 1, a sealer 174 may be provided above the second communication member 17 to prevent leakage of natural gas and crude oil entering into the second communication member 17. The upper end of the fluid circulation tube 12 is sealingly connected to the sucker rod 131 through the sealer 174. To facilitate this movement and improve the seal between the fluid circulation tube 12 and the seal 174 due to the relative movement therebetween, the outer surface of the corresponding portion of the fluid circulation tube 12 that engages the seal 174 is preferably smooth over the range of up and down travel of the fluid circulation tube 12 with the sucker rod 131.

In the present invention, as shown in fig. 8, the fluid circulation heating system 20 may further include a valve 22, a first filter 221 and a check valve 223 disposed on a communication line between the liquid outlet of the liquid storage tank 21 and the liquid inlet of the heat exchanger 23. Wherein, by arranging the valve 22, the valve 22 can be used for controlling the connection and disconnection of the communication pipelines, thereby facilitating the control of the fluid circulation heating system 20; by arranging the first filter 221 and adopting the first filter 221 to filter impurities in the fluid from the liquid storage tank 21, the heat exchange efficiency of the fluid in the heat exchanger 23 can be accelerated, and the heat carrying effect of the fluid is effectively improved; by providing the check valve 223, the check valve 223 can be used to prevent the fluid flowing to the heat exchanger 23 from flowing backward, while ensuring smooth and safe operation of the circulation pump 222 and the heat exchanger 23.

Further, as shown in fig. 8, the reservoir tank 21 may be provided with a safety valve 211, a relief valve 212, a blow-off valve 213, a liquid level gauge 214, a liquid replenishing port 215, an air release valve 216, and a pressure gauge 217. The safety valve 211 can be arranged at the top of the liquid storage tank 21 and is used for ensuring that the liquid storage tank 21 does not work under overpressure, and once the liquid storage tank 21 reaches a set pressure, the safety valve 211 automatically releases the pressure; the relief valve 212 is used for relieving the pressure in the liquid storage tank 21 when the liquid storage tank 21 is overhauled; the blow-down valve 213 can be arranged at the bottom of the liquid storage tank 21 and is used for periodically discharging dirt deposited in the liquid storage tank 21; the liquid level meter 214 can be a magnetic float liquid level meter and is used for detecting the liquid level in the liquid storage tank 21 in real time; the fluid infusion port 215 is used for injecting fluid into the liquid storage tank 21, and when the liquid level meter 214 detects that the liquid level in the liquid storage tank 21 is lower than a certain position, fluid can be infused through the fluid infusion port 215; the emptying valve 216 can be arranged at the bottom of the magnetic float liquid level meter and is used for emptying pollutants in the magnetic float cavity and ensuring that the magnetic float works normally; pressure gauge 217 may be used to detect the pressure at which reservoir 21 is operating. Through the design of the liquid storage tank 21, the safety and the reliability of the liquid storage tank 21 can be ensured, and meanwhile, the intelligent control of the liquid storage tank 21 is facilitated.

In addition, as shown in fig. 8, the fluid circulation heating system 20 may further include a temperature sensor 241, a pressure sensor 242, a pressure switch 243 and a pressure gauge 244 disposed on a communication line between the liquid outlet of the heat exchanger 23 and the inner tube 121. Wherein, the temperature sensor 241 is used for detecting the temperature of the fluid discharged from the liquid outlet of the heat exchanger 23 and transmitting the detected temperature data to a control system (described later), the pressure sensor 242 is used for detecting the pressure of the fluid discharged from the liquid outlet of the heat exchanger 23 and transmitting the detected pressure data to the control system, the pressure switch 243 is set to be opened when the pressure is lower than the normal working pressure by a certain value so as to stop the operation of the circulating pump 222, and the pressure gauge 244 is used for displaying the pressure of the fluid circulation. As shown in fig. 8, a valve 22 may be further disposed below the pressure gauge 244, wherein the valve 22 is normally open during operation; the valve 22 is closed when the pressure sensor 242, pressure switch 243 or pressure gauge 244 need to be serviced. The valve 22 disposed near the inner tube 121 in fig. 8 is used to control the connection and disconnection of the communication line between the liquid outlet of the heat exchanger 23 and the inner tube 121. In order to prevent the loss of heat in the fluid, a high-temperature high-pressure heat-preservation rubber tube can be adopted as a communication pipeline between the liquid outlet of the heat exchanger 23 and the inner tube 121.

In the invention, the heat exchanger 23 and the burner 28 can be integrated, the heat exchanger 23 can be a heating furnace with a combustion chamber at the lower part and a heat exchange chamber at the upper part, a heat exchange tube for fluid flow, the two ends of which are respectively communicated with the liquid inlet and the liquid outlet of the heat exchanger 23, can be arranged in the heat exchange chamber (the heat exchange tube can spirally extend along the height direction of the heat exchange chamber to improve the heat exchange efficiency), a mounting opening communicated with the combustion chamber is arranged on the heating furnace, the burner 28 can be arranged at the mounting opening for blowing, igniting and burning actions, so that natural gas and air are mixed and burned in the combustion chamber, and the heat generated in the combustion chamber is upwards transferred into the heat exchange chamber to heat the fluid in the. In this case, in order to prevent the furnace from being damaged by explosion due to the unblown clean residual gas in the furnace, an explosion-proof membrane 231 may be provided on the heat exchanger 23 to release the pressure in time when the explosion occurs. In addition, a solenoid valve may be provided at an air inlet of the burner 28 to control the operation of the burner 28.

In the present invention, as shown in fig. 7, the fluid circulation heating system 20 may further include a gas distribution bag 27, and the gas distribution bag 27 is disposed on a communication line between the gas inlet of the burner 28 and the first annulus, so as to supply the natural gas separated and purified from the first annulus to the burner 28. The bottom of the air-distributing bag 27 can be provided with a drain 271 for discharging impurities such as separated liquid.

In addition, as shown in fig. 7, the fluid circulation heating system 20 may further include a second filter 25 and an emergency shut-off valve 26 disposed on a communication line between the first annulus and the air inlet of the gas distribution bag 27, and a first pressure gauge 272, a pressure reducing valve 273, a gauge 274, and a second pressure gauge 275 disposed on a communication line between the air outlet of the gas distribution bag 27 and the air inlet of the burner 28. Wherein, the second filter 25 can be used for filtering impurities in the natural gas from the first annulus, the first pressure gauge 272 can be used for detecting the pressure of the gas outlet of the gas distribution bag 27, the second pressure gauge 275 can be used for detecting the working pressure of the fuel gas of the combustor 28, and the meter 274 can be used for detecting the gas flow in a communication pipeline between the gas outlet of the gas distribution bag 27 and the gas inlet of the combustor 28.

In the above, the quick action emergency valve 26 is normally open, and when a situation affecting the safe operation of the apparatus occurs, the quick action emergency valve 26 is closed to cut off the communication between the first annulus and the air inlet of the air separation bag 27, and the supply of natural gas is cut off. Further, as shown in fig. 7, the fluid circulation heating system 20 may include a temperature switch 261 connected to the quick disconnect valve 26, a combustible gas detector 262, and a flame detector 263. Wherein the temperature switch 261 is configured to control the shut-off valve 26 to be closed when the outlet temperature of the heat exchanger 23 is detected to exceed a preset value (for example, in the case that the outlet temperature of the heat exchanger 23 exceeds 170 ℃, the temperature switch 261 controls the shut-off valve 26 to be closed), the combustible gas detector 262 is configured to control the shut-off valve 26 to be closed when natural gas leakage is detected, and the flame detector 263 is configured to control the shut-off valve 26 to be closed when open fire is detected. By arranging the emergency cut-off valve 26, the temperature switch 261, the combustible gas detector 262 and the flame detector 263, the situation that the heat exchanger 23 is burnt out due to the fact that the heat exchanger 23 is short of fluid in an accidental situation and the combustor 28 breaks down without stopping can be prevented, and the device is in a safe state after the device breaks down.

By the design of the fluid circulation heating system 20, the fluid circulation and the natural gas collection and combustion process can be organically combined, and the smooth and safe operation of all links in a mutually coordinated manner is ensured, so that the oil extraction efficiency of the invention can be further improved, and the oil extraction cost is reduced.

In the present invention, in order to ensure the safe, reliable and stable operation of the apparatus, the components in the fluid circulation heating system 20 can be controlled manually or automatically. That is, the hydronic system 20 may have both a manual control mode and an automatic control mode. In this case, the intelligent well thermal fluid heating device may include a control system to control the fluid circulation heating system 20. The control system can switch between the manual control mode and the automatic control mode through the change-over switch. In the manual control mode, the single component can be detected and debugged one by one; under the automatic mode, control system can carry out automatic unmanned on duty operation according to the parameter of setting for, and intelligent degree is higher.

Wherein, the control system can be configured to be electrically connected with the burner 28 and the circulation pump 222 to control the operation of the burner 28 and the circulation pump 222, and the control system can be further configured to be electrically connected with the temperature sensor 241, the pressure sensor 242, the first pressure gauge 272, the second pressure gauge 275, the meter 274, and other detecting components respectively, to receive the data of the temperature, the pressure, the flow rate, and the like detected by the detecting components, so as to facilitate the normal operation of the fluid circulation heating system 20. Of course, the control system may also be electrically connected to other components (e.g., valves, etc.) in the hydronic system 20, and will not be described in detail herein.

When the device works, the device can be powered firstly, the water outlet temperature value of the heat exchanger 23 is set according to the required temperature (which can be measured by arranging a thermometer at a wellhead) of oil well output liquid (crude oil output from a second annulus) and oil well comprehensive data, the air inlet valve 22 of the gas distribution bag 27 is opened to supply air to the gas system shown in fig. 7, the fluid circulation system shown in fig. 8 is filled with softened water, then the change-over switch of the control system is switched to an automatic operation position, and the device starts to operate automatically. In the automatic mode, the control system firstly analyzes the collected data such as temperature, pressure, flow and the like, and after all the operation requirements are met, firstly commands the circulating pump to operate 222, and commands the combustor 28 to work after 30 seconds to provide heat energy for the heat exchanger 23, and the temperature of the produced liquid of the oil well 10 is continuously increased along with the continuous increase of the temperature of the softened water. When the water temperature rises to the set upper limit, the control system commands the combustor 28 to stop working, when the water temperature is lower than the upper limit temperature by 5 ℃, the control system commands the combustor 28 to work, the conversion is repeated and continuous, the outlet water temperature of the heat exchanger 23 is always kept within +/-5 ℃ of the set temperature value, and the normal production of the oil well is ensured. When a water shortage fault occurs, the water pressure will drop and the control system will command the circulation pump 222 to stop operating based on the detected pressure change and will also command the burner 28 to stop operating to prevent dry burning from burning out the heat exchanger 23. The control system can then indicate the fault and send an alarm signal to notify the staff to troubleshoot the fault. The control system not only can enable the device to normally operate, but also can protect the safety of the device and workers.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. An intelligent heating device for oil well hot fluid, which is characterized by comprising:

the oil pipe (11), the oil pipe (11) is coaxially inserted in an oil well (10) extending along the vertical direction, and a radial gap is formed between the oil pipe (11) and the oil well (10) to form a first annular space;

a fluid circulation pipe (12), the fluid circulation pipe (12) is coaxially inserted in the oil pipe (11), the fluid circulation tube (12) and the oil tube (11) have a radial clearance therebetween to form a second annulus, the fluid circulation pipe (12) comprises an inner pipe (121) and an outer pipe (122) which are coaxially sleeved, a radial gap is provided between the inner tube (121) and the outer tube (122) to form a third annulus, the third annulus is arranged to communicate with the inner tube (121) at the bottom end of the fluid circulation tube (12), the inner tube (121) comprises a main tube (1211) and a sleeve (1212), the sleeve (1212) is coaxially sleeved outside the main tube (1211), the two ends of the sleeve (1212) are sealed on the outer wall of the main pipe (1211) to form a sealed annular space between the sleeve (1212) and the main pipe (1211), and the sealed annular space is in a vacuum state;

a fluid circulation heating system (20), the fluid circulation heating system (20) includes a liquid storage tank (21), a heat exchanger (23), a circulation pump (222) and a burner (28), the liquid storage tank (21) is used for storing fluid, a liquid outlet of the liquid storage tank (21) is communicated with a liquid inlet of the heat exchanger (23), the circulation pump (222) is arranged on a communication line between the liquid outlet of the liquid storage tank (21) and the liquid inlet of the heat exchanger (23) for circularly pumping the fluid in the liquid storage tank (21) to the heat exchanger (23), the liquid outlet of the heat exchanger (23) is communicated with the inner pipe (121), the liquid inlet of the liquid storage tank (21) is communicated with the third annulus, an air inlet of the burner (28) is communicated with the first annulus to utilize the natural gas in the first annulus to perform combustion and generate heat, the burner (28) being arranged to transfer the generated heat to the fluid through the heat exchanger (23); and

the oil pumping unit (13), the oil pumping unit (13) comprises an oil pumping rod (131) and an oil pumping piston (132), the oil pumping piston (132) is hermetically arranged in the oil pipe (11) and connected below the fluid circulation pipe (12), the top end of the fluid circulation pipe (12) is connected to the oil pumping rod (131), the fluid circulation pipe (12) and the oil pumping piston (132) can be driven by the oil pumping rod (131) to move up and down along the axial direction of the oil pipe (11), the oil pumping piston (132) is provided with an oil passing hole (1321) for communicating a cavity of the oil pipe (11) below the oil pumping piston (132) with the second annulus,

wherein the fluid circulation heating system (20) comprises a gas distribution bag (27) and an emergency cut-off valve (26), the gas distribution bag (27) is arranged on a communication pipeline between an air inlet of the combustor (28) and the first annulus for supplying the natural gas from the first annulus to the combustor (28) after separation and purification, the emergency cut-off valve (26) is arranged on a communication pipeline between the first annulus and an air inlet of the gas distribution bag (27), the fluid circulation heating system (20) comprises a temperature switch (261) connected with the emergency cut-off valve (26), a combustible gas detector (262) and a flame detector (263), wherein the temperature switch (261) is arranged to control the emergency cut-off valve (26) to be closed when the temperature of the outlet liquid of the heat exchanger (23) is detected to exceed a preset value, the combustible gas detector (262) is arranged to control the quick action emergency valve (26) to close when natural gas leakage is detected, and the flame detector (263) is arranged to control the quick action emergency valve (26) to close when open flame is detected.

2. The intelligent heating device for oil well thermal fluid according to claim 1, which comprises a connecting piece (14) for connecting the fluid circulation pipe (12) and the oil pumping piston (132), wherein the upper end of the connecting piece (14) comprises a cavity (141) with an open top, and a peripheral wall (142) and a bottom wall (143) for limiting the cavity (141), the outer surface of the peripheral wall (142) is provided with an external thread for screwing with the lower end of the outer pipe (122), and the bottom end of the inner pipe (121) is inserted into the cavity (141) through the open top and has a space with the bottom wall (143) to communicate with the third annulus through the cavity (141).

3. An intelligent heating device for oil well thermal fluid according to claim 2, characterized in that the bottom wall (143) is formed in an inverted cone, the apex of which is located on the central axis of the inner pipe (121).

4. The intelligent heating device for oil well hot fluid according to claim 2, characterized in that the fluid circulation pipe (12) comprises a fixing support (124) which is arranged in the outer pipe (122) and used for supporting the lower end of the inner pipe (121), the fixing support (124) is positioned above the connecting piece (14), and a through hole for inserting the lower end of the inner pipe (121) and a communication hole (1241) for communicating the cavity (141) and the third annulus are formed in the fixing support (124).

5. The intelligent heating device for oil well thermal fluid as claimed in claim 2, which comprises a connecting rod (15), wherein the lower end of the connecting piece (14) is provided with a plug hole (144) for the plug of the upper end of the connecting rod (15), and the lower end of the connecting rod (15) is connected to the oil pumping piston (132).

6. The intelligent heating device for oil well thermal fluid according to any one of claims 1 to 5, characterized in that it comprises a first communicating member (16), said first communicating member (16) is mounted on the top end of said fluid circulating pipe (12), said first communicating member (16) is provided with a first communicating port (161) for communicating said inner pipe (121) with the fluid outlet of said heat exchanger (23) and a second communicating port (162) for communicating said third annular space with the fluid inlet of said fluid storage tank (21), said fluid circulating pipe (12) is connected to said sucker rod (131) through said first communicating member (16); and/or

Oil well hot-fluid intelligence heating device includes second intercommunication piece (17), gas holder (18) and oil storage tank (19), second intercommunication piece (17) install in the top of oil well (10), be provided with on second intercommunication piece (17) and be used for the intercommunication first annulus with first intercommunication valve (171) of the air inlet of combustor (28), be used for the intercommunication first annulus with second intercommunication valve (172) of the air inlet of gas holder (18) and be used for the intercommunication second annulus with third intercommunication valve (173) of the oil inlet of oil storage tank (19).

7. Intelligent heating device for oil well hot fluids according to any one of claims 1 to 5, characterized in that said fluid circulation heating system (20) comprises a first filter (221) and a non-return valve (223) arranged on the communication line between the outlet of said storage tank (21) and the inlet of said heat exchanger (23).

8. Intelligent heating device for oil well thermal fluid according to claim 7,

the fluid circulation heating system (20) comprises a temperature sensor (241), a pressure sensor (242) and a pressure switch (243) which are arranged on a communication pipeline between the liquid outlet of the heat exchanger (23) and the inner pipe (121), and/or

The fluid circulation heating system (20) comprises a second filter (25) arranged on a communication pipeline between the first annular space and an air inlet of the air distribution bag (27), and a first pressure gauge (272), a pressure reducing valve (273) and a second pressure gauge (275) arranged on a communication pipeline between an air outlet of the air distribution bag (27) and an air inlet of the combustor (28), wherein the first pressure gauge (272) is used for detecting the pressure of the air outlet of the air distribution bag (27), and the second pressure gauge (275) is used for detecting the working pressure of fuel gas of the combustor (28).

9. The intelligent heating device for oil well hot fluid according to claim 8, characterized in that the liquid storage tank (21) is provided with a safety valve (211), a pressure relief valve (212), a blow-off valve (213), a liquid level meter (214) and a liquid supplementing port (215).

10. An intelligent well thermal fluid heating device according to claim 9, comprising a control system arranged in electrical connection with the burner (28) and the circulation pump (222) to control the operation of the burner (28) and the circulation pump (222), the control system being arranged in electrical connection with the temperature sensor (241), the pressure sensor (242), the first pressure gauge (272) and the second pressure gauge (275), respectively.