CN111636852B - Liquid nitrogen freezing device for temporary plugging of oil field - Google Patents
Liquid nitrogen freezing device for temporary plugging of oil field Download PDFInfo
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- CN111636852B CN111636852B CN202010317987.5A CN202010317987A CN111636852B CN 111636852 B CN111636852 B CN 111636852B CN 202010317987 A CN202010317987 A CN 202010317987A CN 111636852 B CN111636852 B CN 111636852B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 494
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 217
- 239000007788 liquid Substances 0.000 title claims abstract description 135
- 238000007710 freezing Methods 0.000 title claims abstract description 46
- 230000008014 freezing Effects 0.000 title claims abstract description 46
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 61
- 238000009826 distribution Methods 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 38
- 239000010935 stainless steel Substances 0.000 claims description 28
- 239000000945 filler Substances 0.000 claims description 9
- 239000011229 interlayer Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 13
- 238000002156 mixing Methods 0.000 abstract description 7
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000003507 refrigerant Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
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- 238000000605 extraction Methods 0.000 description 2
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- 239000012530 fluid Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/001—Cooling arrangements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention discloses a liquid nitrogen freezing device for temporary blocking of an oil field, which comprises: the liquid nitrogen source module comprises a liquid nitrogen storage tank and an air temperature type heat exchanger connected with the liquid nitrogen storage tank, the air temperature type heat exchanger gasifies liquid nitrogen from the liquid nitrogen storage tank into normal-temperature nitrogen, the low-temperature distribution module comprises a nitrogen blending device, one end of the air temperature type heat exchanger is connected with the liquid nitrogen storage tank, the other end of the air temperature type heat exchanger is connected with a normal-temperature nitrogen inlet of the nitrogen blending device, the nitrogen introduced through the normal-temperature nitrogen inlet moves upwards and is mixed with the liquid nitrogen entering through the liquid nitrogen inlet to exchange heat to obtain cold nitrogen, and is output through a cold nitrogen outlet, a control module is used for controlling a low-temperature flow control valve on a pipeline and a temperature detection device for detecting the nitrogen gas temperature changer, the cold nitrogen is measured and regulated, so that the temperature of a cooling target is controllable, the freezing speed is controllable, material modification is avoided, and the safety of a shaft is guaranteed.
Description
Technical Field
The invention relates to the technical field of freezing temporary plugging of oil field well mouths, provides a stable and reliable cold source when a pipeline or a well mouth is subjected to freezing temporary plugging operation, and particularly relates to a liquid nitrogen freezing device for temporary plugging of oil fields.
Background
In the process of oil and gas exploitation, it is very important to maintain the relative balance between the pressure in the shaft and the formation pressure, when the operation of repairing the oil well or the gas well under pressure and replacing the oil extraction gas production well head or part of gate valves is implemented, the oil and gas channel leading to the ground underground needs to be plugged.
When the operation of repairing the well under pressure and replacing an oil extraction gas production wellhead or a part of gate valves of an oil well or a gas well is implemented, an oil gas channel leading to the ground underground needs to be plugged, the plugging technology process of the traditional machinery is complex, the operation time is long, the wellhead and the annulus are difficult to plug simultaneously, the sealing is unreliable, and therefore the casing in the well needs to be plugged in the shortest time by adopting a freezing temporary plugging technology.
The core of the freezing temporary plugging technology lies in freezing temporary plugging agents in an injection well to realize plugging of pipelines, and the scheme commonly used at present is provided with a freezing box device and a cold nitrogen jacket, wherein the freezing box device needs to be added with the freezing agents manually, pays attention to the situation of the freezing agents for a long time, can not ensure uniform freezing temperature and proper cooling speed, has low working efficiency and is inaccurate to control; the latter uses liquid nitrogen or cold nitrogen as a freezing working medium, realizes automatic supply of the refrigerant, but needs further improvement on the control of the refrigerant, and does not provide a complete system for providing the refrigerant.
In addition, when freezing temporary plugging operation is carried out on an oilfield wellhead, a refrigerant with a proper temperature needs to be provided to freeze the temporary plugging agent, the sealing effect of the temporary plugging agent is affected by unreasonable freezing temperature and cooling speed, the working efficiency is affected, and even unsafe factors such as low temperature and brittleness are caused. The freezing temporary plugging mode of a freezing box mode is used, the freezing agent is dry ice and methanol, and the freezing agent is greenhouse gas and flammable refrigerant, so that unsafe factors are easily caused; the freezing temporary blocking mode using a jacket uses liquid nitrogen as a refrigerant, but a corresponding freezing system for regulating the refrigerant is lacked.
Disclosure of Invention
In view of the above, there is a need to provide a liquid nitrogen freezing device which can control the temperature of a cooling target, control the freezing speed, avoid material modification and ensure the safety of a shaft, aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid nitrogen freezing apparatus for temporary plugging of oil fields, comprising: liquid nitrogen source module, low temperature distribution module and control module, wherein:
the liquid nitrogen source module comprises a liquid nitrogen storage tank and an air-temperature heat exchanger connected with the liquid nitrogen storage tank, the air-temperature heat exchanger gasifies liquid nitrogen from the liquid nitrogen storage tank into normal-temperature nitrogen, and the liquid nitrogen source module is used for providing the normal-temperature nitrogen and the liquid nitrogen for the low-temperature distribution module;
the low-temperature distribution module comprises a nitrogen gas heat exchanger, the nitrogen gas heat exchanger comprises a stainless steel heat exchanging kettle, a liquid nitrogen inlet arranged at the upper end of the stainless steel heat exchanging kettle, a liquid nitrogen spraying atomizer arranged in the stainless steel heat exchanging kettle and connected with the liquid nitrogen inlet, a stainless steel wire mesh arranged at the lower end of the liquid nitrogen spraying atomizer, a normal-temperature nitrogen inlet arranged at the left lower end of the stainless steel heat exchanging kettle, a cold nitrogen outlet arranged at the right upper end of the stainless steel heat exchanging kettle, and a bottom support piece arranged at the lower end of the stainless steel heat exchanging kettle, the stainless steel heat exchanging kettle is wrapped in an insulating filler interlayer, one end of the air-temperature heat exchanger is connected with the liquid nitrogen storage tank, the other end of the air-temperature heat exchanger is connected with the normal-temperature nitrogen inlet of the nitrogen gas heat exchanger, and nitrogen gas introduced through the normal-temperature nitrogen inlet moves upwards to be mixed with liquid nitrogen entering through the liquid nitrogen inlet, Exchanging heat through the stainless steel wire mesh to obtain cold nitrogen, and outputting the cold nitrogen through the cold nitrogen outlet;
the control module comprises a low-temperature flow control valve arranged on a pipeline and a temperature detection device for detecting the nitrogen gas heat exchanger, and is used for measuring, regulating and controlling cold nitrogen gas.
In some preferred embodiments, the liquid nitrogen storage tank is connected to the air-temperature heat exchanger and the cryogenic distribution module by a tee.
In some preferred embodiments, the cryogenic distribution module further comprises a cryogenic distribution box, and the nitrogen attemperator is mounted within the cryogenic distribution box.
In some preferred embodiments, the nitrogen gas temperature changer is connected with the liquid nitrogen inlet through one end of a first tee pipe, the other end of the first tee pipe is connected with a second tee pipe, the third end of the first tee pipe is connected with one end of a third tee pipe, the cold nitrogen gas outlet of the nitrogen gas temperature changer is connected with the other end of the third tee pipe, and the third end of the third tee pipe is connected with a user-side thermostat.
In some preferred embodiments, the low-temperature distribution module further comprises a low-temperature switch valve and a low-temperature flow control valve integrated on the low-temperature distribution box, a first low-temperature flow control valve is arranged on a normal-temperature nitrogen inlet connecting pipeline of the air-temperature heat exchanger and the nitrogen blending device, a second low-temperature flow control valve is arranged on a connecting pipeline of the first three-way pipe and the second three-way pipe, a first low-temperature switch valve is arranged on a liquid nitrogen inlet of the nitrogen blending device and the first three-way pipe connecting pipeline, a second low-temperature switch valve is arranged on a connecting pipeline of the first three-way pipe and the third three-way pipe, and a third low-temperature switch valve is arranged on a cold nitrogen outlet of the nitrogen blending device and the third three-way pipe connecting pipeline.
In some preferred embodiments, the nitrogen charging device further comprises lateral heat-insulating supports arranged on two sides of the stainless steel charging kettle, and the lateral heat-insulating supports are fixed in the heat-insulating filler interlayer.
In some preferred embodiments, the lateral insulating supports are low thermal conductivity materials, such as epoxy glass reinforced plastic, teflon, and the like.
In some preferred embodiments, the nitrogen charging temperature device further comprises a bottom support arranged at the lower end of the stainless steel charging temperature kettle.
In some preferred embodiments, the nitrogen charging device further comprises thermometers arranged at the bottom part, the middle part and the cold nitrogen outlet.
In some preferred embodiments, the control module comprises an electrical control box, a control unit integrated in the electrical control box for controlling the cryogenic flow control valve, and a control panel.
The invention adopts the technical scheme that the method has the advantages that:
the invention provides a liquid nitrogen freezing device for temporary plugging of an oil field, which comprises: liquid nitrogen source module, low temperature distribution module and control module, liquid nitrogen source module include the liquid nitrogen storage tank and with the air temperature formula heat exchanger that the liquid nitrogen storage tank is connected, air temperature formula heat exchanger will come from the liquid nitrogen gasification of liquid nitrogen storage tank is the nitrogen gas of normal atmospheric temperature, liquid nitrogen source module is used for low temperature distribution module provides normal atmospheric temperature nitrogen gas and liquid nitrogen, low temperature distribution module includes that nitrogen gas exchanges the thermoscope, the one end of air temperature formula heat exchanger is connected the liquid nitrogen storage tank, the other end with nitrogen gas exchanges the normal atmospheric temperature nitrogen gas entry of thermoscope and links to each other, through the nitrogen gas upward movement that normal atmospheric temperature nitrogen gas entry lets in with through the liquid nitrogen gas mixture that the liquid nitrogen entry got into, the heat transfer obtains cold nitrogen gas, and pass through cold nitrogen gas export output, control module is used for control pipeline low temperature flow control valve and detection nitrogen gas exchanges the temperature-detecting device of thermoscope, the cold nitrogen is measured and regulated, so that the temperature of a cooling target is controllable, the freezing speed is controllable, the modification of materials is avoided, the safety of a shaft is guaranteed, and meanwhile, the liquid nitrogen freezing device meets the requirements of convenience in use and transportation and is not influenced by severe environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid nitrogen freezing device provided by an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a nitrogen gas temperature changer according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a liquid nitrogen freezing apparatus according to an embodiment of the present invention.
The system comprises a liquid nitrogen source module 100, a low-temperature distribution module 200, a control module 300, an electrical control box 310, a low-temperature pipeline 400, a liquid nitrogen storage tank 10, an air-temperature heat exchanger 11, a nitrogen blending temperature device 20, a stainless steel blending temperature kettle 21, a liquid nitrogen inlet 22, a liquid nitrogen spray atomizer 23, a stainless steel wire mesh 24, a normal-temperature nitrogen inlet 25, a cold nitrogen outlet 26, a heat insulation filler interlayer 27, a lateral heat insulation support 28, a bottom support 29, a user-side thermostat 30, a low-temperature distribution box 40, a control panel 41, a first three-way pipe L1, a second three-way pipe L2, a third three-way pipe L3, a first low-temperature flow control valve V1, a second low-temperature flow control valve V2, a first low-temperature switch valve V21 and a second low-temperature switch valve V22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 3, a schematic structural diagram of a liquid nitrogen freezing apparatus according to an embodiment of the present invention includes: the liquid nitrogen source module 100, the low-temperature distribution module 200, the control module 300 and the low-temperature pipeline 400 are integrated into a skid block, so that the transportation and the use are convenient. The arrangement of the respective components is explained in detail below.
The liquid nitrogen source module 100 is configured to provide normal-temperature nitrogen and liquid nitrogen to the low-temperature distribution module 200.
Specifically, the liquid nitrogen source module 100 includes a liquid nitrogen storage tank 10 and an air-temperature heat exchanger 11 connected to the liquid nitrogen storage tank 10, wherein the air-temperature heat exchanger 11 gasifies liquid nitrogen from the liquid nitrogen storage tank 10 into normal-temperature nitrogen gas.
In some preferred embodiments, the liquid nitrogen storage tank 10 is connected to the air-temperature heat exchanger 11 and the cryogenic distribution module 200 by a tee.
It can be understood that the liquid nitrogen storage tank 10 provided by the invention uses a horizontal liquid nitrogen storage tank to replace a plurality of liquid nitrogen storage tanks, and is simple and convenient to operate, and safer and more reliable.
Referring to fig. 2, a schematic structural diagram of the low-temperature distribution module 200 according to an embodiment of the present invention includes a nitrogen gas heat exchanger 20, where the nitrogen gas heat exchanger 20 includes a stainless steel heat exchanging kettle 21, a liquid nitrogen inlet 22 disposed at an upper end of the stainless steel heat exchanging kettle 21, a liquid nitrogen spraying atomizer 23 disposed in the stainless steel heat exchanging kettle 21 and connected to the liquid nitrogen inlet 22, a stainless steel wire mesh 24 disposed at a lower end of the liquid nitrogen spraying atomizer 23, a normal-temperature nitrogen inlet 25 disposed at a left lower end of the stainless steel heat exchanging kettle 21, a cold nitrogen gas outlet 26 disposed at a right upper end of the stainless steel heat exchanging kettle 21, and the stainless steel heat exchanging kettle 21 is wrapped in an insulating filler interlayer 27.
It can be understood that the liquid nitrogen inlet 22 is positioned at the top end of the nitrogen gas temperature changer 20, and the liquid nitrogen inlet 22 is connected with the liquid nitrogen spray atomizer 23 and can be used for crushing and atomizing the introduced liquid nitrogen under the action of the liquid nitrogen spray atomizer 23.
It can be understood that because the plurality of layers of stainless steel wire meshes 24 are arranged inside the nitrogen heat exchanger 20, the heat exchange between the nitrogen and the liquid nitrogen at normal temperature can be strengthened, the internal mixed heat exchange is strengthened, and larger liquid drops are borne.
The nitrogen gas heat exchanger 20 provided by the invention has the following working mode:
one end of the air temperature type heat exchanger 11 is connected with the liquid nitrogen storage tank 10, the other end of the air temperature type heat exchanger is connected with a normal temperature nitrogen inlet 25 of the nitrogen heat exchanger 20, nitrogen introduced through the normal temperature nitrogen inlet 25 moves upwards, is mixed with liquid nitrogen entering through the liquid nitrogen inlet 22 and exchanges heat through the stainless steel wire mesh 24 to obtain cold nitrogen, and the cold nitrogen is output through the cold nitrogen outlet 26, so that a stable, uniform and reliable cold source is provided for freezing temporary plugging operation of an oil field.
It can be understood that when the nitrogen heat exchanger 20 works, liquid nitrogen enters the stainless steel heat exchanging kettle 21 from the top inlet, is dispersed and crushed into small-particle atomized liquid nitrogen in the liquid nitrogen spraying atomizer 23, and is fully mixed and exchanges heat with normal-temperature nitrogen from the bottom of the stainless steel heat exchanging kettle 21, a small amount of relatively large liquid drops are intercepted by the multiple layers of stainless steel wire meshes 24, the heat exchange of high-temperature fluid and low-temperature fluid is further strengthened by the stainless steel wire meshes 24, and the mixed cold nitrogen is discharged from the nitrogen outlet.
Specifically, the nitrogen gas attemperator 20 is connected to the liquid nitrogen inlet 22 through one end of a first tee pipe L1, the other end of the first tee pipe L1 is connected to a second tee pipe L2, a third end of the first tee pipe L1 is connected to one end of a third tee pipe L3, a cold nitrogen gas outlet 26 of the nitrogen gas attemperator 20 is connected to the other end of the third tee pipe L3, and a third end of the third tee pipe L3 is connected to the user-side thermostat 30.
In some preferred embodiments, the low temperature distribution module 200 further comprises a low temperature distribution box 40, the nitrogen gas attemperator 20 is installed in the low temperature distribution box 40, and the low temperature distribution box is further provided with a control panel 41.
In some preferred embodiments, the cryogenic distribution module 200 further includes a cryogenic switch valve and a cryogenic flow control valve integrated on the cryogenic distribution box 40, a first cryogenic flow control valve V1 is disposed on a connection pipeline between the air-temperature heat exchanger 11 and the normal-temperature nitrogen inlet 25 of the nitrogen attemperator 20, a second cryogenic flow control valve V2 is disposed on a connection pipeline between the first tee pipe L1 and the second tee pipe L2, a first cryogenic switch valve V21 is disposed on a connection pipeline between the liquid nitrogen inlet 22 of the nitrogen attemperator 20 and the first tee pipe L1, a second cryogenic switch valve V22 is disposed on a connection pipeline between the first tee pipe L1 and the third tee pipe L3, and a third cryogenic switch valve V3 is disposed on a connection pipeline between the cold nitrogen outlet 26 of the nitrogen attemperator 20 and the third tee pipe L3.
It can be understood that when the wellhead needs to provide liquid nitrogen, the V1, V21 and V3 are closed, the V22 is opened, and the flow of the liquid nitrogen flowing out of the liquid nitrogen storage tank 10 is controlled by controlling the opening degree of the V2. When the wellhead needs to provide cold nitrogen, the V22 is closed, the V3 and the V21 are opened, and the opening degrees of the V1 and the V2 are automatically controlled through the control strategy of the control module 300 or the needed cold nitrogen flow and the proper temperature are obtained. Wherein, the liquid nitrogen of the V1 way is vaporized into normal temperature nitrogen through the air temperature type heat exchanger 11, and is mixed with the liquid nitrogen of the V2 way in the nitrogen-to-nitrogen gas temperature changer 20, and the proper opening proportion of V1 and V2 can lead the nitrogen to form cold nitrogen with proper temperature for cooling the well head after leaving the nitrogen gas temperature changer 20.
It will be appreciated that both liquid nitrogen and cold nitrogen gas will transport the cryogen provided by the cryogenic distribution module 200 to the user-side thermostat 30 through the insulated cryogenic transfer line in the liquid nitrogen freezer 10. When the system needs purging or re-warming, the control module 300 closes V2, V21 and V22, opens V3, and controls the opening of V1 to obtain the required normal temperature nitrogen flow, and if dry nitrogen higher than normal temperature is required, an electric heating device (not shown) in the nitrogen temperature changer 20 may be turned on, and the control module 300 sets the required nitrogen temperature and automatically controls the heating power of the heating device.
In some preferred embodiments, the nitrogen charging device 20 further comprises lateral heat-insulating supports 28 disposed on both sides of the stainless steel charging kettle 21, and the lateral heat-insulating supports 28 are fixed in the heat-insulating filler interlayer 27. Preferably, the lateral insulating supports 28 are of a material with a low thermal conductivity, such as epoxy glass reinforced plastic, teflon or the like.
In some preferred embodiments, the nitrogen attemperator 20 further comprises a bottom support 29 disposed at the lower end of the stainless steel attemperator 21, and the bottom support 29 is fixed in the heat insulating filler interlayer 27.
It can be understood that different support modes are used according to the temperature distribution in the nitrogen heat exchanger 20, the bottom of the nitrogen heat exchanger is fixedly supported by a common structure, and the side of the nitrogen heat exchanger is supported by low-thermal-conductivity heat insulation, so that the nitrogen heat exchanger is more stable and reliable.
In some preferred embodiments, the nitrogen attemperator 20 further comprises thermometers disposed at the bottom, middle, and cold nitrogen outlets.
The control module 300 includes an electrical control box 310, a control unit (not shown) integrated in the electrical control box for controlling the low temperature flow rate control valve, and the control unit can control the control panel 41.
It can be understood that, in practice, the control module 300 controls the cooling temperature of the casing to be cooled through the inlet temperature of the user-side thermostat 30, and controls the flow rate of the cold nitrogen through the inlet-outlet temperature difference of the user-side thermostat 30, where the inlet-outlet temperature difference is too large, which means that the flow rate of the cold nitrogen is insufficient, and uneven cooling may be caused; and the temperature difference between the inlet and the outlet is too small, which indicates that the flow of the cold nitrogen is too large, the cold energy is discharged without being completely utilized, the economical efficiency of the system is influenced, and the control module 300 controls the flow of the liquid nitrogen and the normal-temperature nitrogen to realize the control of the temperature and the flow of the cold nitrogen due to the combined action of the cold nitrogen and the cold nitrogen.
It can be understood that the control module 300 provided by the invention is internally provided with a temperature control algorithm, and the maximum acceptable temperature gradient and the cooling rate are calculated according to the actual condition of the sleeve to be cooled by matching with input parameters, so that the derivation flow rate of liquid nitrogen is automatically controlled, and the thermal stress in the sleeve is ensured not to exceed the allowable stress; and the control module 300 monitors the temperature in the whole process, the cooling speed is controllable, and the cooling target temperature is controllable.
The invention provides a liquid nitrogen freezing device, comprising: liquid nitrogen source module 100, low temperature distribution module 200 and control module 300, liquid nitrogen source module 100 include liquid nitrogen storage tank 10 and with the air temperature formula heat exchanger 11 that liquid nitrogen storage tank 10 is connected, air temperature formula heat exchanger 11 will come from the liquid nitrogen gasification of liquid nitrogen storage tank 10 is the nitrogen gas of normal atmospheric temperature, liquid nitrogen source module 100 is used for the low temperature distribution module provides normal atmospheric temperature nitrogen gas and liquid nitrogen, low temperature distribution module 200 includes that nitrogen gas changes thermoscope 20, the one end of air temperature formula heat exchanger 11 is connected liquid nitrogen storage tank 10, the other end with nitrogen gas changes the normal atmospheric temperature nitrogen gas entry of thermoscope 20 and links to each other, through the nitrogen gas upward movement that normal atmospheric temperature nitrogen gas entry lets in with the liquid nitrogen mixture, the heat transfer that get into through the liquid nitrogen entry, obtain cold nitrogen gas, and pass through cold nitrogen gas export output, control module is used for low temperature flow control valve on the control pipeline and detects the nitrogen gas changes the temperature-detecting device of thermoscope, the cold nitrogen is measured and regulated, so that the temperature of a cooling target is controllable, the freezing speed is controllable, the modification of materials is avoided, the safety of a shaft is guaranteed, and meanwhile, the liquid nitrogen freezing device meets the requirements of convenience in use and transportation and is not influenced by severe environment.
The liquid nitrogen freezing device provided by the invention has the advantages that the refrigerant stored in the storage cavity can enter the soaking space through the eduction tube, so that the temporary plugging agent in the pipeline to be cooled is frozen, the pipeline to be cooled can be cooled to a lower temperature, the cooling time is shortened, the pressure bearing capacity of the plugging block is increased, the length of the temporary plugging agent is reduced, and the plugging safety is improved.
Of course, the liquid nitrogen freezing device of the present invention may have various changes and modifications, and is not limited to the specific structure of the above-described embodiments. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (8)
1. The utility model provides a liquid nitrogen refrigerating plant for stifled temporarily in oil field which characterized in that: including liquid nitrogen source module, low temperature distribution module and control module, wherein:
the liquid nitrogen source module comprises a liquid nitrogen storage tank and an air-temperature heat exchanger connected with the liquid nitrogen storage tank, the air-temperature heat exchanger gasifies liquid nitrogen from the liquid nitrogen storage tank into normal-temperature nitrogen, and the liquid nitrogen source module is used for providing the normal-temperature nitrogen and liquid nitrogen for the low-temperature distribution module;
the low-temperature distribution module comprises a nitrogen gas heat exchanger, the nitrogen gas heat exchanger comprises a stainless steel heat exchanging kettle, a liquid nitrogen inlet arranged at the upper end of the stainless steel heat exchanging kettle, a liquid nitrogen spraying atomizer arranged in the stainless steel heat exchanging kettle and connected with the liquid nitrogen inlet, a stainless steel wire net arranged at the lower end of the liquid nitrogen spraying atomizer, a normal-temperature nitrogen gas inlet arranged at the left lower end of the stainless steel heat exchanging kettle, a cold nitrogen gas outlet arranged at the right upper end of the stainless steel heat exchanging kettle, the stainless steel heat exchanging kettle is wrapped in an insulating filler interlayer, one end of the air-temperature heat exchanger is connected with the liquid nitrogen, the other end of the air-temperature heat exchanger is connected with the normal-temperature nitrogen gas inlet of the nitrogen gas heat exchanger, nitrogen gas introduced through the normal-temperature nitrogen gas inlet moves upwards to be mixed with the liquid nitrogen entering through the liquid nitrogen inlet and exchanges heat through the stainless steel wire net to obtain cold nitrogen gas, and is output through the cold nitrogen outlet;
the control module is used for controlling a low-temperature flow control valve on a pipeline and detecting a temperature detection device of the nitrogen gas heat exchanger to measure and regulate cold nitrogen gas.
2. The liquid nitrogen freezing device of claim 1 wherein the liquid nitrogen storage tank is connected to the air-temperature heat exchanger and the cryogenic distribution module by a tee.
3. The liquid nitrogen freezing device of claim 1 wherein the cryogenic distribution module further comprises a cryogenic distribution box, the nitrogen attemperator being mounted within the cryogenic distribution box.
4. The liquid nitrogen freezing device according to claim 2, wherein the nitrogen gas temperature changer is connected with the liquid nitrogen inlet through one end of a first tee pipe, the other end of the first tee pipe is connected with a second tee pipe, a third end of the first tee pipe is connected with one end of a third tee pipe, a cold nitrogen gas outlet of the nitrogen gas temperature changer is connected with the other end of the third tee pipe, and the third end of the third tee pipe is connected with a user side thermostat.
5. The liquid nitrogen freezing device of claim 1, wherein the nitrogen gas temperature changer further comprises lateral heat-insulating supports disposed on both sides of the stainless steel temperature changer, and the lateral heat-insulating supports are fixed in the heat-insulating filler interlayer.
6. The liquid nitrogen freezing apparatus of claim 5 wherein the lateral insulating supports are of a material having a low thermal conductivity.
7. The liquid nitrogen freezing device of claim 5, wherein the nitrogen gas temperature changer further comprises a bottom support member arranged at the lower end of the stainless steel temperature changer, and the bottom support member is fixed in the heat-insulating filler interlayer.
8. The liquid nitrogen freezing device of claim 1, wherein the nitrogen attemperator further comprises thermometers disposed at the bottom, the middle, and the cold nitrogen outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317987.5A CN111636852B (en) | 2020-04-21 | 2020-04-21 | Liquid nitrogen freezing device for temporary plugging of oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317987.5A CN111636852B (en) | 2020-04-21 | 2020-04-21 | Liquid nitrogen freezing device for temporary plugging of oil field |
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| Publication Number | Publication Date |
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| CN111636852A CN111636852A (en) | 2020-09-08 |
| CN111636852B true CN111636852B (en) | 2022-06-03 |
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| CN117646614B (en) * | 2024-01-29 | 2024-04-05 | 中国石油集团川庆钻探工程有限公司 | Freezing temporary plugging valve replacing device and method |
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| NO810967L (en) * | 1980-03-31 | 1981-10-01 | Halliburton Co | NITROGEN HEATING DEVICE. |
| CN1004374B (en) * | 1985-04-01 | 1989-05-31 | N·V·菲利浦斯光灯制造厂 | Liquefying method of gases and the liquefier used |
| CN102192382B (en) * | 2010-03-05 | 2012-11-14 | 中国石油天然气股份有限公司 | Temporary freezing plugging method for small-diameter oil and gas pipeline |
| US10864457B2 (en) * | 2014-11-28 | 2020-12-15 | Chr. Hansen A/S | Spray freezing |
| JP6858267B2 (en) * | 2017-02-24 | 2021-04-14 | エクソンモービル アップストリーム リサーチ カンパニー | Dual purpose LNG / LIN storage tank purging method |
| CN108759303B (en) * | 2018-08-03 | 2024-07-26 | 丁斌 | Cryogenic liquid gasification cold energy recycling device |
| CN209444312U (en) * | 2018-12-25 | 2019-09-27 | 中国科学院理化技术研究所 | Well head cooling device based on high-speed turbo expander |
| CN110440085B (en) * | 2019-08-13 | 2021-06-08 | 西南石油大学 | Temporary liquid nitrogen low-temperature blocking device suitable for gathering and transportation pipelines with multiple pipe diameters |
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