CN112392434A - Device and method for effectively reducing pipe column blockage in brine discharge process of salt cavern gas storage - Google Patents
Device and method for effectively reducing pipe column blockage in brine discharge process of salt cavern gas storage Download PDFInfo
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- 239000012267 brine Substances 0.000 title claims abstract description 79
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000003860 storage Methods 0.000 title claims abstract description 41
- 150000003839 salts Chemical class 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 119
- 241001131796 Botaurus stellaris Species 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 33
- 239000003921 oil Substances 0.000 description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000003345 natural gas Substances 0.000 description 7
- 239000011780 sodium chloride Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 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
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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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
- E21B36/003—Insulating 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/005—Heater surrounding production tube
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a device and a method for effectively reducing pipe column blockage in a brine discharge process of a salt cavern gas storage. This effectively reduce device that salt cave gas storage row bittern in-process tubular column blockked up includes: the wellhead control device and the electromagnetic heating device are electrically connected with the wellhead control device; wherein the electromagnetic heating device comprises: the electromagnetic heating coil is fixed on the outer wall of the central pipe in a winding mode, and two ends of the electromagnetic heating coil are electrically connected with the wellhead control device through cables. The invention also provides a method for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage. The device and the method can effectively reduce or avoid the blockage problem of the brine discharge pipe column, effectively avoid the economic and safety problems caused by the operation of pulling out the pipe column, and ensure the safe and efficient operation of brine discharge and cavity building of the gas storage.
Description
Technical Field
The invention relates to the technical field of gas storage injection and production engineering. More particularly, relates to a device and a method for effectively reducing pipe column blockage in the brine discharge process of a salt cavern gas storage.
Background
The gas storage plays an important role in the aspect of natural gas conservation and supply in winter, and is an important foundation stone for national energy safety. The domestic gas storage mainly comprises a gas storage type gas storage and a salt cavern type gas storage. Compared with a gas reservoir type gas storage, the salt cavern type gas storage has the characteristics of large single-cavity storage capacity, easiness in injection and production, capability of performing multiple injection and production in a short period and the like, and has strong capability of adjusting the nonuniformity of natural gas in winter. The salt cavern gas storage is a space which is large in size and good in sealing property and is used for dissolving out an underground salt layer in a water-soluble mode, and can store redundant natural gas in a gas utilization trough and extract the natural gas in a gas utilization peak so as to adjust the imbalance of the gas utilization of the natural gas.
In the process of making a cavity in a salt cave, clear water is injected and brine is extracted by descending a middle pipe and a central pipe in a sleeve, wherein the central pipe is arranged in the middle pipe. On site, a cavity is built in a reverse circulation mode, namely clear water is injected from an annular space between the middle pipe and the central pipe column, and brine reaching a certain concentration is drained and produced from a well head through the middle pipe. In the field operation process, the middle pipe is easy to block due to crystallization of NaCl and the like, so that brine discharge operation cannot be carried out, and a pipe column needs to be lifted out for unblocking operation. If in the cavity building process, the pulling-out pipe column can be directly pulled out of the central pipe; if in the gas injection and brine discharge process (after the cavity is formed, gas is injected at a well mouth to discharge brine in a salt cavern and reserve a space for storing natural gas), the pressure in the salt cavern needs to be applied, so that clean water or brine is injected into the salt cavern to discharge the injected natural gas, and the operation of the tubular column can be carried out, so that the operation period is delayed, and the brine discharge operation needs to be carried out again, thereby causing economic waste. Therefore, there is an urgent need to develop a method and apparatus for reducing or avoiding the clogging of the pipe string during the process of discharging brine, so as to reduce the adverse consequences caused by the clogging of the pipe string.
Therefore, the invention provides a device and a method for effectively reducing the blockage of a pipe column in the brine discharge process of a salt cavern gas storage, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a device for effectively reducing pipe column blockage in the brine discharge process of a salt cavern gas storage. The device can prevent the pipe column blockage caused by the crystallization of NaCl and the like in brine in the salt cavern gas storage cavity-making and brine-discharging process, and avoid economic and safety problems caused by the operation of pulling out the pipe column.
The invention also aims to provide a method for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an effectively reduce device that salt cavern gas storage arranged bittern in-process tubular column blockked up, includes:
wellhead control device, and
the electromagnetic heating device is electrically connected with the wellhead control device; wherein,
the electromagnetic heating device includes:
a central tube, and
and the electromagnetic heating coil is wound and fixed on the outer wall of the central pipe, and two ends of the electromagnetic heating coil are electrically connected with the wellhead control device through cables.
Preferably, joints are arranged at two ends of the electromagnetic heating coil, and two ends of the electromagnetic heating coil are electrically connected with a cable through the joints respectively.
Preferably, the electromagnetic heating coil is of a segmented structure, and the multiple segments of electromagnetic heating coils are electrically connected in sequence through joints along the extension direction of the central tube.
Preferably, the electromagnetic heating device comprises a plurality of central pipes, and the central pipes are sequentially connected through threads along the extending direction of the central pipes.
Preferably, each of the central tubes is wrapped around its outer wall with at least one section of electromagnetic heating coil.
Preferably, the electromagnetic heating device further comprises a heat insulation layer sleeved outside the electromagnetic heating coil.
Preferably, the device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage comprises a plurality of electromagnetic heating devices which are respectively and electrically connected with a wellhead control device; wherein,
a plurality of central tubes in a plurality of electromagnetic heating devices are connected sequentially through threads along the extension direction of the central tubes, and two ends of an electromagnetic heating coil in each electromagnetic heating device are electrically connected with a cable respectively.
Preferably, the base pipe is an oil pipe.
Preferably, the cable is an armoured cable.
Preferably, the wellhead control device comprises:
an alternating current power supply for supplying power to the electromagnetic heating coil and the cable,
a control box for controlling the power switch, and
a cable suspension device for suspending a cable.
The invention also provides a method for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage, which uses the device and comprises the following steps:
1) collecting basic data of the brine drainage operation well; determining a well section needing to be heated according to the basic data; determining the number of turns and the resistance of the electromagnetic heating coil according to the temperature to be heated;
2) winding and fixing an electromagnetic heating coil with determined number of turns and resistance on the outer wall of the central tube, and electrically connecting two ends of the electromagnetic heating coil with a wellhead control device through cables respectively;
3) a brine discharging pipe column is put into the well, and when the well section needing to be heated is determined in the step 1), a central pipe wound and fixed with an electromagnetic heating coil in the step 2) is connected;
4) and opening the wellhead control device to start brine discharge operation.
Preferably, the basic data of the brine discharge operation well in the step 1) comprise discharge capacity, wellhead temperature, wellhead pressure, bottom hole temperature, bottom hole pressure and brine concentration.
Preferably, the step 1) of determining the well section to be heated according to the basic data specifically includes:
obtaining a shaft temperature and pressure profile through basic data of the brine discharge operation well, and determining a well section needing to be heated according to the change rule of brine concentration and NaCl solubility along with the temperature and the pressure.
The invention has the following beneficial effects:
the device and the method can effectively reduce or avoid the blockage problem of the brine discharge pipe column, effectively avoid the economic and safety problems caused by the operation of pulling out the pipe column, and ensure the safe and efficient operation of brine discharge and cavity building of the gas storage.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the apparatus for effectively reducing the blockage of a pipe string during the brine discharge process of a salt cavern gas storage provided by the invention;
FIG. 2 shows a cross-sectional view of an electromagnetic heating apparatus with an insulation layer provided by the present invention;
FIG. 3 is a schematic diagram of an apparatus for effectively reducing the blockage of a pipe column in the process of discharging brine from a salt cavern gas storage, which comprises a plurality of electromagnetic heating devices, provided by the invention;
the device comprises a wellhead control device 1, a central pipe 2, an electromagnetic heating coil 3, a joint 4, a cable 5 and an insulating layer 6.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The main reason for blocking the salt cavern gas storage in the brine discharge process is that NaCl and the like in brine are crystallized due to temperature change and then adsorbed on the inner wall of a pipe column. If the temperature of brine produced from the bottom of the well can be kept above a certain temperature (under the temperature condition, the brine cannot be crystallized due to NaCL and the like caused by temperature reduction), the risk of pipe column blockage can be effectively reduced or avoided. In the process of thick oil exploitation in the petroleum industry, heating is needed, and the problem that the fluidity of the thick oil is poor and the thick oil cannot be produced due to temperature reduction is avoided; the common methods mainly comprise heating of cables in the hollow rod, heating of an electrified sucker rod, electric heating of an oil pipe and the like. The thick oil in the shaft is heated to a certain temperature to ensure the normal flow of the thick oil during thick oil exploitation, most of domestic oil wells need to be subjected to mechanical pumping operation (with sucker rods), and the crude oil is basically non-conductive. In the operation of arranging bittern, do not have other any device (no sucker rod) in the tubular column, the mobile medium is that brine electric conductivity is very strong, and need not to heat all brines in the pit shaft to the settlement temperature, only need guarantee with the brine temperature of pipe wall contact meet the demands can. Therefore, the thick oil heating method is not suitable for heating in the brine discharge process of the salt cavern gas storage. Therefore, the invention provides a device for effectively reducing the blockage of a pipe column in the brine discharge process of a salt cavern gas storage, which has the principle that a certain number of coils with resistance are wound on the outer wall of a central pipe of a brine discharge pipe column and are connected with the central pipe underground through a special cable; when the installation is accomplished, insert the alternating current at the well head, according to the electromagnetic induction principle, make the coil generate heat and then heat the center tube, finally reach the purpose of maintaining the temperature with center tube contact brine.
Specifically, referring to fig. 1, an apparatus for effectively reducing the pipe column blockage during the brine discharge process of a salt cavern gas storage comprises:
the electromagnetic heating device is electrically connected with the wellhead control device 1; wherein,
the electromagnetic heating device includes:
a central tube 2, and
and the electromagnetic heating coil 3 is wound and fixed on the outer wall of the central pipe 2, and two ends of the electromagnetic heating coil are electrically connected with the wellhead control device 1 through a cable 5.
The electromagnetic heating coil is a certain number of coils wound on the outer wall of the central tube and has certain resistance; the electromagnetic heating coil has the main function of heating the central tube according to the electromagnetic induction principle after being electrified; the electromagnetic heating coil is insulated, so that mutual interference cannot occur, and the electric leakage phenomenon cannot occur; in the whole process, the brine discharge pipe column and the brine in the shaft cannot be electrified, so that the operation safety is ensured; in addition, the number of turns and the resistance of the electromagnetic heating coil determine the heat which can be generated under the condition of wellhead current, and the electromagnetic heating coil can be designed according to the temperature required to be heated on site; the electromagnetic heating coils with different turns and/or resistances can be designed for the central pipes with different depths according to requirements;
the cable is mainly used for providing a current loop for the electromagnetic heating coil on the outer wall of the central tube, and connecting the current at the tail end of the electromagnetic heating coil back to a wellhead or connecting a wellhead power supply to the tail end of the electromagnetic heating coil;
the central pipe is made of a common standard oil pipe and meets the requirements of brine discharge capacity and the strength of the pipe column, and the inner diameter of the central pipe is at least not smaller than the inner diameter and the design strength of the original brine discharge pipe column;
in addition, it should be understood by those skilled in the art that the electromagnetic heating coil may be fixed to the outer wall of the central tube by a conventional method, for example, a field-specific clip for fixing a cable may be used, and the present application is not limited thereto.
As a preferred embodiment of the present invention, joints 4 are provided at both ends of the electromagnetic heating coil 3, and both ends of the electromagnetic heating coil 3 are electrically connected to cables 5 through the joints 4, respectively; interfaces are reserved at the upper end and the lower end of the electromagnetic heating coil so as to be connected with other electromagnetic heating coils or cables.
In order to control the resistance and the heating temperature conveniently, as a preferred embodiment of the present invention, the electromagnetic heating coil 3 has a segmented structure, and the multiple segments of electromagnetic heating coils are electrically connected in sequence through the joint 4 along the extending direction of the central tube 2; the joint is mainly used for connecting each section of electromagnetic heating coil, the electromagnetic heating coil and a downhole cable, the electromagnetic heating coil and a wellhead power supply and the like, and the whole system is ensured to be a passage.
In addition, if the well section to be heated is long and needs to be connected and used by a plurality of base pipes, as a preferred embodiment of the invention, the electromagnetic heating device comprises a plurality of base pipes 2, and the base pipes 2 are sequentially connected by screw threads along the extension direction of the base pipes; further, the outer wall of each central tube 2 is wound with at least one section of electromagnetic heating coil 3.
In order to solve the impact and other influences of the fluid on the heating coil, as a preferred embodiment of the present invention, the electromagnetic heating device further includes an insulating layer 6 sleeved outside the electromagnetic heating coil 3, as shown in fig. 2. In the cavity-making and brine-discharging process, clear water and brine continuously flow in an annular space between the central pipe and the intermediate pipe to impact the heating coils, so that the distribution state of the heating coils is easy to change or fall off, and the heating temperature cannot meet the design requirement; according to the invention, the heat-insulating layer is wrapped outside the central tube which is wound with the electromagnetic heating coil, so that on one hand, the electromagnetic heating coil is protected from being influenced by water flow impact, corrosion and the like, and the service life is prolonged; on the other hand can further improve the heating efficiency to brine, reduces the heat and to annular space fluid diffusion between center tube and the intermediate tube, and this heat preservation still can further guarantee electromagnetic heating coil's fixed in addition, avoids it to drop.
In addition, as will be understood by those skilled in the art, the material of the insulating layer may be conventional insulating material, which is not limited in the present application.
As a preferred embodiment of the invention, the device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage comprises a plurality of electromagnetic heating devices which are respectively and electrically connected with a wellhead control device 1, as shown in figure 3; wherein,
a plurality of central tubes 2 in a plurality of electromagnetic heating devices are sequentially connected through threads along the extending direction of the central tubes 2, and two ends of an electromagnetic heating coil 3 in each electromagnetic heating device are respectively and electrically connected with a cable 5. If the well section needing to be heated is long, the oil pipe needing to be lowered into the heating coil is too much, and the situation that the resistance of the lowered coil is too large and the heat generated under the condition of a wellhead power supply is not enough to heat the brine to the designed temperature can exist. In the invention, the problem is solved by adopting a method of connecting a plurality of electromagnetic heating devices in parallel, and preferably 2-3 electromagnetic heating devices are connected in parallel.
A plurality of central pipes in each electromagnetic heating device are connected through threads, and all sections of electromagnetic heating coils are connected in series. When the well is deeply drilled, the resistance of the coil is too large, and the central pipe is insufficiently heated under the condition of certain well head voltage; at the moment, a multi-section combination mode is preferably adopted, namely a plurality of electromagnetic heating devices are adopted, each electromagnetic heating device comprises a plurality of central pipes wound with a plurality of sections of electromagnetic heating coils, after the central pipes are placed into a certain depth, the bottom ends of the sections of electromagnetic heating coils at the bottommost ends are connected with a wellhead control device through cables, and the central pipes are a complete loop; and then continuously lowering a plurality of central pipes wound with electromagnetic heating coils outside into a certain depth, connecting the bottom ends of the sections of electromagnetic heating coils at the bottommost ends with a wellhead control device through cables, and repeating the steps until the central pipes are completely lowered. The main purpose is to connect all the electromagnetic heating devices in a parallel mode, and under a certain condition of wellhead pressure, the current in the electromagnetic heating coil meets a certain requirement and is fully added into the central pipe.
As a preferred embodiment of the present invention, the central tube in the present invention is preferably a standard oil tube with a length of about 10m, i.e. each central tube with heating coils is preferably 10 m.
As a preferred embodiment of the present invention, the cable 5 is an armored cable; the armored cable is high in strength, can adapt to deeper well depth conditions, and is higher in safety.
As a preferred embodiment of the present invention, the wellhead control device comprises:
an alternating current power supply for supplying power to the electromagnetic heating coil and the cable,
a control box for controlling the power switch, and
a cable suspension device for suspending a cable. In the invention, an alternating current power supply mainly provides power for the underground heating coil and the cable, and 220v or 380v current on site can be converted into voltage and frequency required by a system through a transformer; the control box is mainly used for controlling a power switch and can adopt the combination of a dynamic switch and a static switch; the cable suspension device is mainly used for suspending the underground cable and bearing the weight of the cable; in the process of discharging the brine, the brine discharging pipe column needs to be lowered and lifted up within a certain range according to the operation requirement, so that the cable also needs to move up and down according to the actual requirement.
As another aspect of the invention, the invention also provides a method for effectively reducing the blockage of a pipe column in the brine discharge process of the salt cavern gas storage, which uses the device and comprises the following steps:
1) collecting basic data of the brine drainage operation well; determining a well section needing to be heated according to the basic data; determining the number of turns and the resistance of the electromagnetic heating coil according to the temperature to be heated;
2) winding and fixing an electromagnetic heating coil with determined number of turns and resistance on the outer wall of the central tube, and electrically connecting two ends of the electromagnetic heating coil with a wellhead control device through cables respectively;
3) a brine discharging pipe column is put into the well, and when the well section needing to be heated is determined in the step 1), a central pipe wound and fixed with an electromagnetic heating coil in the step 2) is connected;
4) and opening the wellhead control device to start brine discharge operation.
As a preferred embodiment of the present invention, the basic data of the brine discharge operation well in the step 1) comprise discharge capacity, wellhead temperature, wellhead pressure, bottomhole temperature, bottomhole pressure and brine concentration. It should be understood by those skilled in the art that the collection of the basic data of the brine discharge operation well is a conventional technical method, and the detailed description thereof is omitted.
As a preferred embodiment of the present invention, the determining the well section to be heated according to the basic data in step 1) specifically includes:
obtaining a shaft temperature and pressure profile through basic data of the brine discharge operation well, and determining a well section needing to be heated according to the change rule of brine concentration and NaCl solubility along with the temperature and the pressure. It will be appreciated by those skilled in the art that the determination of the well section to be heated is conventional and will not be described in detail herein.
In summary, in the process of thick oil recovery, all thick oil needs to be heated to a certain temperature to ensure the fluidity of the thick oil; otherwise, the thick oil cannot flow and cannot be recovered. Unlike thickened oil recovery, it is not necessary to heat all the brine in the wellbore to the design temperature; under normal conditions, the fluidity of the brine completely meets the requirement, and the fluidity is basically not changed even if the brine is heated to a certain temperature. In the cavity-making and brine-discharging process, NaCl is crystallized and separated out only from brine contacting the pipe wall of the central pipe due to temperature reduction, so that a pipe column is blocked. Therefore, the device can avoid the crystallization of NaCL only by heating the brine contacting with the pipe wall of the central pipe and maintaining the temperature, thereby greatly reducing the volume of the brine to be heated and greatly reducing the heat generated by the heating coil; namely, the invention adopts surface heating, greatly reduces the power consumption and solves the problem of serious energy consumption of heating a large amount of brine for a long time (such as 3 to 5 years).
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The utility model provides an effectively reduce device that salt cavern gas storage row bittern in-process tubular column blockked up which characterized in that includes:
wellhead control device, and
the electromagnetic heating device is electrically connected with the wellhead control device; wherein,
the electromagnetic heating device includes:
a central tube, and
and the electromagnetic heating coil is wound and fixed on the outer wall of the central pipe, and two ends of the electromagnetic heating coil are electrically connected with the wellhead control device through cables.
2. The device for effectively reducing the blockage of the tubular column in the brine discharge process of the salt cavern gas storage as claimed in claim 1, wherein joints are arranged at two ends of the electromagnetic heating coil, and two ends of the electromagnetic heating coil are electrically connected with cables through the joints respectively.
3. The device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage as claimed in claim 1, wherein the electromagnetic heating coil is of a segmented structure, and the multiple sections of electromagnetic heating coils are electrically connected in sequence through connectors along the extension direction of the central pipe.
4. The device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage as claimed in claim 1, wherein the electromagnetic heating device comprises a plurality of central pipes, and the central pipes are sequentially connected through threads along the extension direction of the central pipes.
5. The apparatus of claim 4, wherein each of the central tubes is wrapped with at least one section of electromagnetic heating coil.
6. The device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage as claimed in claim 1, wherein the electromagnetic heating device further comprises an insulating layer sleeved outside the electromagnetic heating coil.
7. The device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage as claimed in any one of claims 1 to 6, wherein the device for effectively reducing the blockage of the pipe column in the brine discharge process of the salt cavern gas storage comprises a plurality of electromagnetic heating devices which are respectively and electrically connected with a wellhead control device; wherein,
a plurality of central tubes in a plurality of electromagnetic heating devices are connected sequentially through threads along the extension direction of the central tubes, and two ends of an electromagnetic heating coil in each electromagnetic heating device are electrically connected with a cable respectively.
8. The apparatus according to claim 1, wherein the cable is an armored cable.
9. The apparatus of claim 1, wherein the wellhead control device comprises:
an alternating current power supply for supplying power to the electromagnetic heating coil and the cable,
a control box for controlling the power switch, and
a cable suspension device for suspending a cable.
10. A method for effectively reducing the blockage of a pipe column in the brine discharge process of a salt cavern gas storage, which is characterized by using the device as claimed in any one of claims 1 to 9, and comprising the following steps:
1) collecting basic data of the brine drainage operation well; determining a well section needing to be heated according to the basic data; determining the number of turns and the resistance of the electromagnetic heating coil according to the temperature to be heated;
2) winding and fixing an electromagnetic heating coil with determined number of turns and resistance on the outer wall of the central tube, and electrically connecting two ends of the electromagnetic heating coil with a wellhead control device through cables respectively;
3) a brine discharging pipe column is put into the well, and when the well section needing to be heated is determined in the step 1), a central pipe wound and fixed with an electromagnetic heating coil in the step 2) is connected;
4) and opening the wellhead control device to start brine discharge operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910742790.3A CN112392434A (en) | 2019-08-13 | 2019-08-13 | Device and method for effectively reducing pipe column blockage in brine discharge process of salt cavern gas storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910742790.3A CN112392434A (en) | 2019-08-13 | 2019-08-13 | Device and method for effectively reducing pipe column blockage in brine discharge process of salt cavern gas storage |
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| CN112392434A true CN112392434A (en) | 2021-02-23 |
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| CN201910742790.3A Pending CN112392434A (en) | 2019-08-13 | 2019-08-13 | Device and method for effectively reducing pipe column blockage in brine discharge process of salt cavern gas storage |
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| CN (1) | CN112392434A (en) |
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