WO2009065316A1

WO2009065316A1 - A downhole geothermal steam driving device and a genrating electricity and pumping liquid method thereof

Info

Publication number: WO2009065316A1
Application number: PCT/CN2008/072178
Authority: WO
Inventors: Zhiyong Gong
Original assignee: Zhiyong Gong
Priority date: 2007-11-19
Filing date: 2008-08-27
Publication date: 2009-05-28
Also published as: CN101440784B; CN101440784A

Abstract

A downhole geothermal steam driving device includes an evaporator (1), an automatic switch valve (2), a pneumatic cylinder (3), a driving chamber (4) and a heat exchanger (5), the evaporator (1) is placed at the bottom of the well (6), the evaporator (1) is connected with the automatic switch valve (2), an inlet and outlet pipe (7) is placed between the automatic switch valve (2) and the pneumatic cylinder (3), a driving rod (17) of the pneumatic cylinder (3) extends into the driving chamber (4), a steam discharge pipe (8) is placed between the automatic switch valve (2) and the heat exchanger (5), a return insulating pipe (9) is placed between the evaporator (1) and the heat exchanger (5). The device can work underground, the cost is low and the output power is large.

Description

Underground coal thermal energy steam driving device and power generation or liquid discharging method thereof

[1] The present invention relates to a device that utilizes thermal energy of a medium-high temperature layer deep in the earth itself, and specifically relates to a downhole geothermal steam driving device and a method of generating or pumping the same.

Background technique

[2] Traditional driving devices are on the surface of the earth, using coal, oil and gas, water potential energy, geothermal energy, etc.

, to convert energy and work. The driving devices that use coal, oil and natural gas are mostly thermal power generation on the ground. Coal, oil and natural gas are burned, exhaust gas is discharged into the atmosphere, and the fuel generates superheated steam. The steam is generated by the steam turbine generator and ends at the end of the cycle. The cockroach is cooled. However, only a part of the heat of combustion of the whole process is converted into steam heat, and a large part of the energy is lost through the consumption of the combustion process. According to preliminary calculations, the overall efficiency is reduced by about 40%.

Drives that use water potential to generate electricity are often subject to conditions; existing geothermal power generation drives mostly direct geothermal heat through the well to the surface, which is drilled to a depth deep enough to allow use in the earth's crust Heat causes water or other liquids to evaporate to obtain steam. The steam then pushes the steam turbine to do work to generate electricity. However, because steam is sent to the surface, a large part of the heat is lost. This requires a large amount of steam to be sent to the ground to make enough Electricity, the results are limited to the geothermal hot spring area that has been discovered, and the failure rate is high, the scope of application is small, and the maintenance cost is very expensive, which restricts the development of geothermal energy technology. Disclosure of invention

technical problem

[3] An object of the present invention is to provide a downhole geothermal steam driving device,

Underground geothermal steam drive

The invention can also solve the problem that the original steam driving device needs to transport a large amount of steam to the ground, causing large energy loss, small application range and high cost, and the present invention also provides the same

A method of generating electricity or pumping a downhole geothermal steam drive.

Technical solution

[4] This downhole geothermal steam drive includes a heat take-up evaporator, an automatic reversing valve, a pneumatic cylinder, and a drive chamber. , heat exchanger, heat evaporator is installed at the bottom of the well, the thermal evaporator is connected with the automatic reversing valve, the automatic reversing valve and the pneumatic cylinder are installed into the exhaust pipe, and the driving rod of the pneumatic cylinder extends into the driving cavity. A steam exhaust pipe is installed between the automatic reversing valve and the heat exchanger, and a condensing returning temperature vacuum pipe is installed between the thermal evaporator and the heat exchanger.

[5] The generator is installed in the drive cavity in the above scheme, and the generator is driven by a drive rod or a liquid motor.

[6] The sputum pump is installed in the drive chamber of the above solution, and the plunger of the sputum pump is driven by the drive rod to perform up and down aspiration.

[7] A further solution is that the heat exchanger is connected to the radiator through a circulation pipe, and the circulation drive pump is installed on the circulation pipe.

The radiator is installed in a low temperature underground.

[8] The method for generating electricity or pumping the above-mentioned underground geothermal steam driving device, using the medium-high temperature heat energy in the deep layer to heat the liquid medium in the thermal evaporator to generate steam pressure, and the steam pressure enters the pneumatic through the automatic dynamic reversing valve. The cylinder pushes the plug to reciprocate in the cylinder, and the driving rod drives the engine or the sputum pump to operate to generate electricity or pump liquid. The gas discharged from the cylinder block passes through the exhaust pipe connecting the reversing valve and enters the heat exchanger. The heat exchange with the low temperature medium, the liquid formed after the heat exchange is returned to the heat taking evaporator for the next recycling.

[9] The method for generating electricity by the above-mentioned underground geothermal steam driving device is applied to electric refining, electric cast iron, electrolytic hydrogen gas, and civil electricity.

[10] The above method for pumping liquid from a underground geothermal steam drive device is applied to oil extraction and pumping in an oil field.

Beneficial effect

[11] The invention is installed inside the well to drive the generator or the sputum pump to generate electricity or pump liquid. Since it works directly underground, there is no need to guide the geothermal heat to the ground, and there is no heat loss, so that the cost of the device is low. Non-polluting, high output energy, not only can generate electricity but also pump liquid, can achieve lower cost power generation or sputum, low operating cost, large power generation, low investment, wide application range, suitable for a wide area below 500 meters above sea level; The method for generating electricity or pumping the underground geothermal steam driving device provided by the present invention provides a new technology and a new method for changing the energy supply mode.

DRAWINGS

Figure 1 is a schematic view showing the structure of the present invention;

2 is a schematic structural view of a first embodiment of the present invention; Figure 3 is a schematic structural view of a second embodiment of the present invention;

Figure 4 is a schematic view showing the structure of a fourth embodiment of the present invention.

[16] In the picture: 1 take the thermal evaporator 2 automatic reversing valve 3 pneumatic cylinder 4 drive cavity 5 heat exchanger 6 well 7

Inlet and exhaust pipe 8 steam exhaust pipe 9 condensing return temperature insulation vacuum pipe 10 drain pipe 11 return pipe 12 cycle drive pump 13 radiator 14 ground 15 linear generator 16 釆 oil pump 17 drive rod 18 plug 19 rotary generator 20 liquid Motor

BEST MODE FOR CARRYING OUT THE INVENTION

Figure 1 is a schematic view of the structure of the present invention, Figure 2

Is a schematic structural view of the first embodiment of the present invention, as shown in FIG. 1 and FIG. 2

As shown, the downhole geothermal steam drive includes a thermal evaporator 1 and an automatic reversing valve 2

, pneumatic cylinder 3, drive chamber 4, heat exchanger 5, well 6 in this embodiment

For geothermal wells, installed on the ground 14

Next, the wellbore is made of a metal casing, and the well depth is determined by the ability to obtain geothermal heat. The thermal evaporator 1 is installed at the bottom of the well 6, and the thermal evaporator is taken.

The liquid in the liquid is a volatile, low-boiling, non-corrosive liquid. In this embodiment, it is diethyl ether. The thermal evaporator 1 and the automatic reversing valve 2 are connected through a steam communication pipe, and the automatic reversing valve 2 and the pneumatic cylinder 3

The pneumatic cylinder 3 is a multi-stage pneumatic cylinder. The driving rod 17 of the pneumatic cylinder 3 extends into the driving chamber 4. The linear generator 15 is installed in the driving chamber 4, and the linear generator 15 is driven by the driving rod 17. Operation, generating electric energy; a steam exhaust pipe 8 is installed between the automatic reversing valve 2 and the heat exchanger 5, and the gas discharged from the cylinder block passes through the steam exhaust pipe 8 connecting the automatic reversing valve 2, and enters the heat exchanger 5 and Heat exchange in a low temperature medium, taking the heat evaporator 1 and the heat exchanger 5

Install a condensing return between the insulation vacuum tubes 9, in the heat exchanger 5

The cold liquid diethyl ether formed after the heat exchange is refluxed to the heat take-up evaporator 1 for the next cycle. The heat exchanger 5 is connected to the radiator 3 through the drain pipe 10 and the return pipe 11, and the radiator 3 in this embodiment

For the heat sink, install the circulation drive pump 12 on the drain pipe 10, linear generator 15

The motor is powered, the motor drives the circulating drive pump 12 to work, and the heat sink is installed in the low temperature layer at 3 - 200 meters below the shallow surface. The medium in the heat sink is water.

[18] The power generation method of the underground geothermal steam driving device uses the medium-high temperature heat energy in the deep layer to heat up Evaporator 1

The low-boiling liquid medium, such as diethyl ether, generates steam pressure, and the vapor pressure enters the pneumatic cylinder 3 through the automatic dynamic reversing valve 2, pushing the plug 18 to reciprocate in the cylinder, and the driving rod 17

Push the linear generator again 15

Operation, power generation, the gas discharged from the cylinder block passes through the steam exhaust pipe 8 connected to the automatic reversing valve 2, and enters the heat exchanger 5

The heat exchange with the low-temperature medium water, the liquid diethyl ether formed after the heat exchange is returned to the heat-receiving evaporator 1 for the next recycling.

Embodiments of the invention

[19] Figure 3

It is a schematic structural view of a second embodiment of the present invention. As shown in the figure, the downhole geothermal steam driving device includes a heat taking evaporator 1, an automatic reversing valve 2, a pneumatic cylinder 3, a driving chamber 4, and a heat exchanger 5. The well 6 in the embodiment is an oil well, the wellbore is made of a metal casing, the thermal evaporator 1 is installed at the bottom of the well 6, the thermal evaporator 1 is connected with the automatic reversing valve 2, the automatic reversing valve 2 and the pneumatic The cylinder 3 is installed with an exhaust pipe 7, and the pneumatic cylinder 3 is a multi-stage pneumatic cylinder. The driving rod 17 of the pneumatic cylinder 3 extends into the driving chamber 4. The oil pump 16 is installed in the driving chamber 4, and the oil pump 16 is driven by the driving rod 17. Operation: A steam exhaust pipe 8 is installed between the automatic reversing valve 2 and the heat exchanger 5, and a condensing returning temperature vacuum pipe 9 is installed between the thermal evaporator 1 and the heat exchanger 5. The heat exchanger 5 is connected to the radiator ₃ through the drain pipe 10 and the return pipe 11. In the present embodiment, the radiator 3 is a heat pipe, and the drain pipe 10

The circulation drive pump 12 is mounted thereon, the circulation drive pump 12 is operated by the oil pump 16 to discharge the liquid drive liquid motor 20, the liquid motor 20 drives the circulation drive pump 12 to operate, and the heat dissipation pipe is installed at a low temperature layer 4 meters below the shallow surface, the heat pipe The medium in the medium is water.

[20] This method of pumping oil from a downhole geothermal steam drive, using medium to high temperature heat in the deep

Heating and heating evaporator 1

The liquid medium in the ether makes it generate steam pressure, and the steam pressure passes through the automatic reversing valve 2

Entering the pneumatic cylinder 3, pushing the plug to reciprocate in the cylinder, the driving rod 17 pushes the sputum pump 16 to operate, pumping the oil, and the gas ether discharged from the cylinder block is connected to the steam exhausting of the automatic directional control valve 2 Tube 8, entering heat exchanger 5 The heat exchange with the low temperature medium, the ether liquid formed after the heat exchange is refluxed to the heat take-up evaporator 1 for the next recycling.

[21] In a third embodiment of the present invention, well ₆

For the well, the wellbore is prefabricated from cement, in the shape of a rectangular parallelepiped, taking the thermal evaporator 1

Installed at the bottom of the well, the thermal evaporator 1 is connected to the automatic reversing valve 2, and the automatic reversing valve 2 is installed between the pneumatic cylinder 3 and the exhaust pipe 7. The pneumatic cylinder 3 is a single-stage pneumatic cylinder, and the pneumatic cylinder 3 The driving rod 17 extends into the driving cavity 4, and a pump is installed in the driving cavity 4, and the driving rod 17 is driven by the driving rod 17

Drive pump operation; Install steam exhaust pipe between automatic reversing valve 2 and heat exchanger 5 8

A condensing return temperature isolation vacuum tube 9 is installed between the heat evaporator 1 and the heat exchanger 5. The heat exchanger 5 is connected to the heat dissipating water tank through a circulation pipe, and the circulation drive pump 12 is installed on the circulation pipe, and the circulation drive pump 12 is driven by the pump discharge liquid. The cooling water tank is installed below the shallow surface. 200

In the low temperature layer at the meter, the medium in the radiator tank is water.

[22] This method of pumping water from a underground geothermal steam drive unit uses a medium-high temperature heat energy to heat the evaporator in the depth of the formation.

The low-boiling liquid medium ether is used to generate steam pressure. The steam pressure enters the pneumatic cylinder 3 through the automatic reversing valve 2, pushing the plug to reciprocate in the cylinder, and the driving rod 17

The pump is further driven to pump water, and the gas ether discharged from the cylinder block is connected to the steam exhaust pipe 8 of the automatic reversing valve 2 to enter the heat exchanger 5

The heat exchange with the low temperature medium, the ether liquid formed after the heat exchange is refluxed to the heat take-up evaporator 1 for the next recycling.

[23] In the fourth embodiment of the present invention, the well 6 is an oil and gas well, the wellbore is made of a metal casing, and the thermal evaporator 1 is installed at the bottom of the well 6, and the thermal evaporator 1 and the automatic reversing valve 2 are taken.

Through the steam communication pipe, the automatic reversing valve 2 and the pneumatic cylinder 3 are installed into the exhaust pipe 7. The pneumatic cylinder 3 is a multi-stage pneumatic cylinder, and the driving rod of the pneumatic cylinder 3 extends into the driving cavity 4, and is installed in the driving cavity 4. The rotary generator 19 is driven by the drive rod 17 through the liquid motor 20 to drive the rotary generator 19

Operation, generating electric energy, synchronizing the generator 19 to supply power to the motor, the motor drives the circulating drive pump 12 to work, and the heat sink is installed below the shallow surface.

In the low temperature layer at the meter, the medium in the heat sink is water. The other structure is the same as that of the first embodiment. [24] The well 6 of the present invention may also be pre-formed into a cylindrical shape from cement.

[25] The automatic reversing valve and the pneumatic cylinder mounting inlet and exhaust pipe 7 in the present invention can also be installed in the driving rod 17 and the plug piece 18 to complete the intake and exhaust in the pneumatic cylinder 3.

[26] The present invention is due to

Working directly underground, there is no need to direct geothermal heat to the ground, no heat loss, making the device low in cost, pollution-free, and high in output energy. It can not only generate electricity but also pump liquid, enabling lower cost power generation or sputum.

Claims

Claim

1. A downhole geothermal steam driving device, characterized in that it comprises a thermal evaporator (1), an automatic reversing valve (2), a pneumatic cylinder (3), a driving chamber (4), a heat exchanger (5)

), take the thermal evaporator (1) installed at the bottom of the well (6), take the thermal evaporator (1

) Interconnection with automatic reversing valve (2), automatic reversing valve (2) and pneumatic cylinder (3

) Install the intake and exhaust pipes ( ⁷ ) and the drive rods of the pneumatic cylinders ( 3 ) ( 17

) extends into the drive chamber (4); automatic reversing valve (2) and heat exchanger (5

Between the installation of the steam exhaust pipe (8), take the thermal evaporator (1) and the heat exchanger (5)

Between the condensing and returning insulation vacuum tubes (9).

2. According to claim 1

The downhole geothermal steam driving device is characterized in that: the driving cavity (4)

The generator is installed inside and the generator is driven by the drive rod (17) or the liquid motor (20).

3. According to claim 1

The downhole geothermal steam driving device is characterized in that: a driving pump (16) is installed in the driving cavity (4), and a sputum pump is driven by a driving rod (Π) (16)

The plunger moves up and down.

4. According to claim 2 or 3

The underground geothermal steam driving device is characterized in that: the heat exchanger (5) is connected to a radiator (13) through a circulation pipe, and a circulation driving pump (12) is installed on the circulation pipe, and the radiator (13) Installed underground.

5. According to claim 4

The underground geothermal steam driving device is characterized in that: the radiator (13) is installed in a low temperature layer at a position of 3 - 200 meters below the shallow surface.

6. According to claim 1

The underground geothermal steam driving device is characterized in that: the pneumatic cylinder (3) is a single-stage cylinder or a multi-stage cylinder, and an intake and exhaust pipe between the automatic reversing valve and the pneumatic cylinder (7)

Installed in the drive rod (17) and the plug (18); the heat sink (13)

) for the heat sink or heat pipe; the well (6 ) Made of metal casing or pre-formed from cement.

7. According to claim 1

The downhole geothermal steam driving device is characterized in that: the downhole geothermal steam driving device is used in an oil or gas well or a water well or a geothermal well.

8. According to claim 1

The method for generating electricity or pumping liquid in a underground geothermal steam driving device is characterized in that: using a medium-high temperature heat energy in the deep layer to heat the heat evaporator (1)

The liquid medium in the steam is generated to generate steam pressure. The steam pressure enters the pneumatic cylinder (3) through the automatic reversing valve (2), pushes the plug to reciprocate in the cylinder, and the driving rod (17) pushes the engine or sputum Pump (16

Run, generate electricity or pump liquid, and the gas discharged from the cylinder block is connected to the automatic reversing valve.

(2) The steam exhaust pipe (8) enters the heat exchanger (5)

The heat exchange with the low temperature medium, the liquid formed after the heat exchange is returned to the heat take-up evaporator (1) for the next recycling.

9. According to claim 8

The power generation method of the underground geothermal steam driving device is characterized in that: the method is applied to electric refining, electric cast iron, electrolysis hydrogen, and civil electricity.

10. According to claim 8

The method for pumping a underground geothermal steam driving device is characterized in that: the method is applied to oil extraction and pumping in an oil field.