CN107542438A - A kind of method of parallel water horizontal well exploitation of gas hydrate - Google Patents
A kind of method of parallel water horizontal well exploitation of gas hydrate Download PDFInfo
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- CN107542438A CN107542438A CN201710991662.3A CN201710991662A CN107542438A CN 107542438 A CN107542438 A CN 107542438A CN 201710991662 A CN201710991662 A CN 201710991662A CN 107542438 A CN107542438 A CN 107542438A
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Abstract
A kind of method of parallel water horizontal well exploitation of gas hydrate, belong to the production technique field of gas hydrates.Methods described includes：With reference to geologic information, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, decompression exploitation is implemented until without economic benefit by horizontal well after completion, then ground supply system and insulated tubing heating system are arranged in water injection well, injection hot water is stored to gas hydrates by water injection well, and natural gas and recovered water are collected from producing well；The present invention can employ gas hydrates reserves by arranging that the horizontal well of parallel distribution improves to target storage, realize that hot-water flooding is exploited using insulated tubing heating system, can improve the efficiency of heating surface, reduce thermal loss, and improve gas production efficiency, increase economic benefit.
Description
Technical field
A kind of method of parallel water horizontal well exploitation of gas hydrate, belong to the production technique field of gas hydrates,
Heating and the method for voltage drop method exploitation of gas hydrate are comprehensively utilized more particularly to a kind of.
Background technology
Gas hydrates (natural gas hydrate, abbreviation NGH) are natural gases under certain low temperature, high pressure
The non-stoichiometry cage compound formed with water, also referred to as " combustible ice ".1m3Gas hydrates can contain 164m3Methane gas
And 0.8m3Water." combustible ice " is the product of growing nonparasitically upon another plant of natural gas, and application is roughly the same with natural gas, is a kind of typical
Oil substitutes." combustible ice " easily burns, under equal conditions, energy ratio coal caused by " combustible ice " burning, oil, natural
Gas will be higher by decades of times, be described as " belonging to the super energy that end is come ".
The flammable ice reserves very abundant in China, according to investigation, the gas hydrates in China are mainly distributed on south
Marine site, Area of The East China Sea, Qinghai-Tibet tundra and northeast tundra.
Artificially break the phase balance condition that gas hydrates are stabilized, promote its decomposition, be that current exploitation is natural
The main method of gas hydrate.According to the equilbrium phase diagram of gas hydrates, heating, chemical method, decompression can be generally divided into
The class of method three.
Heating：Steam, hot water, hot salt brine or other hot fluid mediums are mainly pumped into natural gas by the method from ground
Hydrate reservoir, also using the fire flooding used when exploiting heavy oil or drill string heater can be utilized.Hot production technique it is main not
Foot is to cause substantial amounts of heat loss, and efficiency is very low.
Add chemical agent：The chemical agent such as some chemical agents, salt solution, methanol, ethanol, ethylene glycol, glycerine can change
Become the phase balance condition of gas hydrate synthesis, reduce hydrate equilibrium temperature.The shortcomings that adding chemical agent maximum is that expense is too expensive.
Because the pressure of big midocean gas hydrates is higher, thus the method should not be used.
Voltage drop method：Cause the movement of the stable phase equilibrium line of gas hydrates by reducing pressure, so as to reach
Promote the purpose of gas hydrate dissociation.Free gas under exploitation hydrate layer is that the one kind for reducing reservoir pressure has efficacious prescriptions
Method, the purpose of control reservoir pressure can be reached additionally by the extraction rate of regulation natural gas, and then controls hydrate
The effect of decomposition.The characteristics of voltage drop method maximum is continuous agitation that need not be expensive, thus it is likely to become and opened on a large scale from now on
Adopt one of effective ways of gas hydrates.
CN 200910059321.8 disclose it is a kind of by water pump to outside exploitation of gas hydrates well the device of draining and
Method, the pressure of gas hydrates layer is reduced by draining, promote the decomposition of gas hydrates layer.It is but simple using drop
The decomposition motive force that platen press provides is small, and gas hydrate dissociation causes temperature to reduce, when temperature is reduced to less than 0 DEG C, and also
Ice can be caused to block the stagnation with gas hydrate dissociation, while CN 20111048906.4 discloses a kind of drainage and step-down
The method exploitation of gas hydrate of heating, the continuous decomposition for promoting hydrate, above two method are all to utilize hydrate point
Escaped after solution on gas, water is because deadweight is fallen, and water pump discharges water outside exploitation of gas hydrates well, but actually decomposition gas
Substantial amounts of steam is carried during upper ease, upward velocity is very slow, and production efficiency is very low.And level is utilized in CN 20111048906.4
Well combustion heating, combustion heating is dangerous in exploitation of gas hydrates well, has inside and outside exploitation of gas hydrates well flammable
Gas, directly heated using naked light abnormally dangerous.Tapped natural gas in CN 201310398998.0 using microwave generator heating
Hydrate, promote gas hydrate dissociation by heating, but exploited using straight well mode and limit heated gas water
The heated volume of compound, and by microwave generator be fixed on packer top more further limit gas hydrates by
Hot volume.
The content of the invention
The present invention relates to a kind of method of parallel water horizontal well exploitation of gas hydrate, methods described includes：With reference to geology
Data, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, is exploited after completion by horizontal well implementation decompression straight
To without economic benefit, ground supply system and insulated tubing heating system then are arranged in water injection well, by water injection well to natural
Gas hydrate storage injection hot water, and natural gas and recovered water are collected from producing well；The present invention to target by storing
Gas hydrates reserves can be employed by arranging that the horizontal well of parallel distribution improves, and hot-water flooding is realized using insulated tubing heating system
Exploitation, the efficiency of heating surface can be improved, reduce thermal loss, and improve gas production efficiency, increase economic benefit.
To achieve these goals, the invention provides a kind of method of parallel water horizontal well exploitation of gas hydrate, institute
The method of stating comprises the steps：
Step 1, arrangement horizontal-well network, with reference to geologic information, target is stored and arranges parallel, horizontal well pattern, two mouthfuls in well pattern
Horizontal well is one group, passes through parallel level distribution well as producing well as water injection well, lower curtate position well positioned at storage high-order bit well
Gas hydrates reserves can be employed to improve；
Step 2, completion practice, parallel, horizontal well pattern arrangement carry out supporting completion practice after completing；
Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, to water injection well and producing well
Implement decompression exploitation, until without economic benefit；
Step 4, arrangement heating system, heating system include ground supply system and insulated tubing heating system；
Step 5, heating exploitation, injection hot water is stored to gas hydrates by water injection well, and day is collected from producing well
Right gas and stratum water.
Parallel, horizontal well pattern includes in the step 1：The water injection well horizontal segment bearing of trend is horizontal with the producing well
Section bearing of trend can be in the same direction or reverse.
The parallel, horizontal well pattern arranges that scope is：The difference scope 5-50 of water injection well horizontal segment and producing well horizontal segment depth
Rice, horizontal section length scope 500-2000 rice, corresponding well spacing parameter is selected according to formation condition in actual production.
Supporting completion practice is divided into straight well section completion and horizontal segment completion in the step 2, straight in the straight well section completion
Well section depth is more than horizontal segment depth 5-30 rice, forms liquid storage chamber, to realize that air water point is adopted, reduces produced gas water content, and press down
Gas hydrates are formed in sleeve pipe processed；The horizontal segment completion is well-case perforating completion, perforation fragment position, perforating depth, is penetrated
Hole density can be adjusted according to actual storage situation；Tripping in electricity is latent in the water injection well and producing well straight well section during operation
Pump, tripping in is to straight well section bottom liquid storage chamber, and tripping in sand control installation, sand control installation can prevent gas hydrate dissociation from producing
Sandstone enter straight well section in, prevent sandstone damage underground equipment；Specific implementation process is the tripping in sand control into horizontal well successively
Device, centralizer, electric submersible pump and power cable, the sand control installation, centralizer, electric submersible pump and power cable are conventional
Downhole tool, model can be adapted to according to actual storage situation selection.
The supporting ground system of producing well includes electric power system, produced water treatment system, produced gas processing system in the step 3
System and control system.
The electric power system includes power supply, frequency converter, is sequentially connected, passed through by power cable and production wellhead oil pipe entrance
Power converter output is adjusted, and then adjusts electric submersible pump in shaft bottom drain age velocity；The power supply include generator, commercial power and
Various normal power supplies.
The produced water treatment system includes water storage device, water treatment facilities, control valve, temperature sensor, pressure and passed
Sensor, fluid flowmeter, it is sequentially connected via liquid line and the outlet of production wellhead oil pipe, is passed by fluid flowmeter, pressure
Sensor and temperature sensor real-time collecting electric submersible pump discharge opeing data, displacement is implemented to control by control valve, at water
Reason device is filtered to recovered water, degassing process, the water after filtering is fed into water storage device to treat to handle in next step, the storage
Metering device is provided with inside water installations, to monitor water-holding quantity inside water storage device；The water storage device include water pot and its
He has the container for depositing water storage function, and the metering device, which includes tank gage and other, has the device for measuring water level function,
The water treatment facilities is included with the conventional water treatment equipment that airway dysfunction is dissolved in filtering, decomposition water, the control valve, temperature
It is conventional equipment to spend sensor, pressure sensor, fluid flowmeter, liquid line.
The extraction gas processing system includes warehousing and transportation facilities, gas treatment equipment, gas-liquid separator, control valve, temperature
Sensor, pressure sensor, gas flowmeter are spent, production wellhead cannula exit is connected to via gas transmission line successively, passes through gas
Flowmeter body, pressure sensor and temperature sensor real-time collecting sleeve pipe gas production data, gas production is implemented by control valve
Control, gas-liquid separation processing is carried out to produced gas by gas-liquid separator, the natural gas after separation feeds natural gas treatment plant
Next step processing, including filtration treatment, desulfurization process, dewater treatment are carried out, the natural gas after processing feeds warehousing and transportation facilities and carried out
Transport；The warehousing and transportation facilities include gas transmission line, pressure vessel and other there is the conventional equipment of natural gas accumulating function, it is described
Gas treatment equipment includes
The conventional equipment with gas-liquid separating function, the control valve, temperature sensor, pressure sensor, gas flowmeter, gas transmission
Pipeline is conventional equipment.
It is connected between the water treatment facilities and gas-liquid separator by gas transmission line with liquid line, the appendix
Line is provided with gas flowmeter, and the liquid line is provided with fluid flowmeter, caused natural after being deaerated in water treatment facilities
Gas feeds gas-liquid separator, and the water that gas-liquid separator separates go out feeds water treatment facilities and is further processed.
The control system includes controller and signal receiver, passes through frequency converter in signal-transmitting cable and electric power system
It is connected, to monitoring frequency converter working condition in real time, and remote control is implemented to frequency converter by controller, passed by signal
Transmission cable connects with control valve, temperature sensor, pressure sensor, fluid flowmeter, metering device in produced water treatment system
Connect, monitoring produced water treatment working state of system is implemented by controller, and realize and produced water treatment system remote is controlled, lead to
Signal-transmitting cable is crossed with control valve, temperature sensor, pressure sensor, gas flowmeter in extraction gas processing system to connect
Connect, monitoring extraction gas processing system working condition is implemented by controller, and realize to producing gas processing system remote control；Institute
State controller include computer, tablet personal computer and other there is the conventional equipment of control function, the signal receiver is tool
There is signal to receive, the conventional equipment of transformation function.
The decompression exploitation is embodied as, and shaft bottom is drawn water by electric submersible pump in water injection well and producing well, passes through oil pipe
With the gas production of casing annulus part, underground electric submersible pump discharge capacity is implemented to adjust by frequency converter, when gas production is too low or other
After reason causes no economic benefit, water injection well Ground device is removed one by one, and arrange heating system.
Ground supply system described in the step 4 includes electric power system, water system and control system.
The electric power system includes power supply, frequency converter, ribbon heater attachment means, is connected successively with water injection well by power cable
Connect, by adjusting power converter output, and then adjust insulated tubing heating system in underground heating power；The power supply includes
Generator, commercial power and various normal power supplies, the ribbon heater attachment means are that the routine with connection, fixing function is set
It is standby.
The water system includes water treatment facilities, water storage device, metering device, supercharging device, fluid flowmeter, temperature
Sensor, pressure sensor, the water treatment facilities, water storage device, supercharging device, fluid flowmeter, temperature sensor, pressure
Sensor is sequentially connected via liquid line and water injection well；The water treatment facilities connects water source, injection water is filtered,
Degassing process, the water after filtering is fed into water storage device, metering device is provided with inside the water storage device, to monitor water storage dress
Internal water-holding quantity is put, the supercharging device provides operating pressure, the fluid flowmeter, pressure sensor and temperature for injection water
Sensor records water system operational data in real time；The water source includes well water, seawater, stratum recovered water and other conventional water
Source, the water treatment facilities are included with the conventional water treatment equipment that airway dysfunction is dissolved in filtering, decomposition water, the water storage device
Including water pot and other have and deposit the container of water storage function, the metering device, which includes tank gage and other, has measurement water
The device of bit function, the supercharging device include water pump, pump truck and other there is the conventional supercharging device of function of increasing pressure, the temperature
It is conventional equipment to spend sensor, pressure sensor, fluid flowmeter, liquid line.
The control system includes controller and signal receiver, passes through frequency converter in signal-transmitting cable and electric power system
It is connected, to monitoring frequency converter working condition in real time, and remote control is implemented to frequency converter by controller, passed by signal
Transmission cable is connected with temperature sensor, pressure sensor, fluid flowmeter, supercharging device, metering device in water system, is passed through
Controller implements monitoring water system working condition, and realizes to water system remote control；The controller include computer,
Tablet personal computer and other there is the conventional equipment of control function, the signal receiver be received with signal, transformation function
Conventional equipment.
Insulated tubing heating system in the step 4, including insulated tubing, ribbon heater, centralizer, packer and loudspeaker
Mouthful, in water injection well, tripping in horn mouth, insulated tubing, packer, centralizer, horn mouth will envelopes after reaching predeterminated position successively
Sealed every device, to form closed water filling space, the packer, centralizer can be one or multiple, the electric heating
Band is fixed on insulated tubing inwall, and the ribbon heater can be one or a plurality of；The ribbon heater be with insulation,
Electrical heating, the conventional equipment of corrosion proof function, the length of ribbon heater, heating power can be adjusted according to actual storage condition,
The fixed form of ribbon heater includes cementing and other conventional fixed forms, and the packer, centralizer is can be with insulated tubings
Matching used conventional equipment, the insulated tubing, horn mouth are conventional equipment, according to the adjustable difference of storage concrete condition
Model.
Heating exploitation specific implementation process is in the step 5, by ground supply system to insulated tubing heating system
Injection water and work electricity consumption are provided, hot water is generated in insulated tubing and is injected in storage, injection water is adjusted by supercharging device
Amount, injection rate, power output of the power supply to insulated tubing heating system is adjusted by frequency converter, collected by producing well natural
Gas and stratum water.
In horizontal production well gas production process, by controlling water injection well injection rate and producing well to produce gas and water discharge capacity, and then adjust
Whole producing well hydrodynamic face and flowing bottomhole pressure (FBHP), between making producing well flowing bottomhole pressure (FBHP) holding 1.5-4Mpa, pass through and adjust rational row
Speed is adopted, control produced gas water content, temperature, to suppress to be formed gas hydrates in pit shaft, and keeps higher gas production speed
Degree.
Beneficial effect of the present invention is：
1) present invention is exploited by voltage drop method to water injection well and producing well first, to ensure to exploit in follow-up hot-water flooding
Shi Buhui because hydrate largely decomposes and occur bottom pressure is too high, the too fast danger to caused by underground equipment of natural gas flow velocity
Evil, improve the security of exploitation of gas hydrates.
2) present invention production bottom be provided with liquid storage chamber, the water generated in recovery process can into liquid storage chamber and via
Electric submersible pump is discharged, and is made output gas avoid mixing with water in underground, can effectively be reduced the water content of natural gas in oil jacket annular space, is increased
Gas upward velocity, and then improve production efficiency.
3) present invention is heated by insulated tubing heating system to injection water, is heated using underground, and thermal loss is small,
Energy utilization rate is high, and heat time, power are adjustable, and safe and reliable.
4) present invention greatly limit increase can employ gas hydrates reserves by parallel water horizontal well mode well spacing,
Heated by high-order bit, and packer be provided with water injection well, force the natural gas being decomposed out and water to enter lower curtate position producing well,
The natural gas and water for carrying heat persistently keep heat transfer in downflow processes, can increase heat utilization ratio, further improve
Economic benefit.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required accompanying drawing used in description will be made below simple
Ground introduction, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for those skilled in the art
For, it can also obtain other accompanying drawings according to these accompanying drawings on the premise of not paying creative work.
Fig. 1 is parallel, horizontal well pattern distribution schematic diagram in the same direction.
Fig. 2 is the reverse distribution schematic diagram of parallel, horizontal well pattern.
Fig. 3 is decompression exploitation completion schematic diagram.
Fig. 4 is producing well ground configuration schematic diagram.
Fig. 5 is water injection well ground feed system schematic diagram.
Fig. 6 is insulated tubing internal structure schematic diagram.
Fig. 7 is insulated tubing heating system schematic diagram.
Drawing reference numeral：1st, water injection well 2, producing well 3, gas hydrates reservoir 4, overlying rock 5, lower rock stratum
6th, straight well section 7, horizontal segment 8, sleeve pipe 9, oil pipe 10, perforated interval 11, sand control installation 12, electric submersible pump 13, centralizer 14,
Liquid storage chamber 15, power supply 16, power cable 17, frequency converter 18, production wellhead 19, fluid flowmeter 20, pressure sensor
21st, temperature sensor 22, liquid line 23, control valve 24, water treatment facilities 25, water storage device 26, metering device
27th, gas transmission line 28, gas flowmeter 29, gas-liquid separator 30, gas treatment equipment 31, warehousing and transportation facilities 32, control
Device 33, signal receiving device 34, signal-transmitting cable 35, supercharging device 36, ribbon heater attachment means 37, water injection well
38th, insulated tubing 39, ribbon heater 40, packer 41, horn mouth.
Embodiment
The embodiment of the present invention provides a kind of method of parallel water horizontal well exploitation of gas hydrate, and methods described includes：Knot
Geologic information is closed, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, implements to be depressured by horizontal well after completion
Exploitation then arranges ground supply system and insulated tubing heating system in water injection well, passes through water injection well until without economic benefit
Gas hydrates are stored with injection hot water, and natural gas and recovered water are collected from producing well.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, belongs to the scope of protection of the invention.
The embodiments of the invention provide a kind of method of parallel water horizontal well exploitation of gas hydrate, methods described is included such as
Lower step：
Step 1, arrangement horizontal-well network, with reference to geologic information, target is stored and arranges parallel, horizontal well pattern, two mouthfuls in well pattern
Horizontal well is one group, passes through parallel level distribution well as producing well as water injection well, lower curtate position well positioned at storage high-order bit well
Gas hydrates reserves can be employed to improve, parallel, horizontal well pattern there are following two arrangement modes：
Parallel, horizontal well pattern as shown in Figure 1 distribution schematic diagram in the same direction, water injection well 1 are distributed in the same direction with producing well 2, water injection well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and water injection well 1 and the horizontal segment of producing well 2 are hydrated in natural gas
In thing reservoir 3, under overlying rock 4, on lower rock stratum 5.
The reverse distribution schematic diagram of parallel, horizontal well pattern as shown in Figure 2, water injection well 1 are reversely distributed with producing well 2, water injection well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and water injection well 1 and the horizontal segment of producing well 2 are hydrated in natural gas
In thing reservoir 3, under overlying rock 4, on lower rock stratum 5.
Step 2, completion practice, parallel, horizontal well pattern arrangement carry out supporting completion practice after completing, and decompression as shown in Figure 3 is opened
Completion schematic diagram is adopted, the straight well section 6 pierces depth and pierces depth more than horizontal segment 7, forms liquid storage chamber 14；The horizontal segment 7
Completion is well-case perforating completion, and perforated interval 10 is located on horizontal segment 7；Tripping in electricity is latent in water injection well 1 and the straight well section 6 of producing well 2
Pump 12, tripping in the bottom liquid storage chamber 14 of straight well section 6, and tripping in sand control installation 11, are drawn water to shaft bottom by oil pipe 9, pass through oil pipe 9
With the annular section gas production of sleeve pipe 8；Specific implementation process is tripping in sand control installation 11, centralizer 13, electricity are latent into horizontal well successively
Pump 12 and power cable, do not regard in power cable figure.
Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, to water injection well and producing well
Implement decompression exploitation, until without economic benefit, producing well ground configuration schematic diagram as shown in Figure 4, the supporting ground of producing well
System includes electric power system, produced water treatment system, extraction gas processing system and control system.
The electric power system includes power supply 15, frequency converter 17, by power cable 16 and the entrance of 18 oil pipe of production wellhead 9 successively
Connection, by adjusting the power output of frequency converter 17, and then electric submersible pump 12 is adjusted in shaft bottom drain age velocity.
The produced water treatment system includes water storage device 25, water treatment facilities 24, control valve 23, temperature sensor
21st, pressure sensor 20, fluid flowmeter 19, it is connected by liquid line 22 with the outlet of the oil pipe 9 of production wellhead 18, passes through liquid
Flowmeter body 19, pressure sensor 20 and the discharge opeing data of 21 real-time collecting electric submersible pump of temperature sensor 12, pass through control valve 23
Displacement is implemented to control, recovered water filtered by water treatment facilities 24, degassing process, the water after filtering is fed into storage
Water installations 25 are to treat to handle in next step, and the inside of water storage device 25 is provided with metering device 26, to monitor in water storage device 25
Portion's water-holding quantity.
The extraction gas processing system includes warehousing and transportation facilities 31, gas treatment equipment 30, gas-liquid separator 29, regulating valve
Door 23, temperature sensor 21, pressure sensor 20, gas flowmeter 28, are connected to production wellhead via gas transmission line 27 successively
18 sleeve pipes 8 export, by gas flowmeter 28, pressure sensor 20 and the gas production data of 21 real-time collecting sleeve pipe of temperature sensor 8,
Gas production is implemented to control by control valve 23, gas-liquid separation processing, separation are carried out to produced gas by gas-liquid separator 29
Natural gas afterwards feeds natural gas treatment plant 30 and carries out next step processing, including filtration treatment, desulfurization process, dewater treatment,
Natural gas after processing feeds warehousing and transportation facilities 31 and transported, the gas-liquid separator 29, gas treatment equipment 30 and accumulating
Equipment 31 is connected by gas transmission line 27, and gas flowmeter 28 is provided with pipeline.
It is connected between the water treatment facilities 24 and gas-liquid separator 29 by gas transmission line 27 with liquid line 22, institute
State gas transmission line 27 and be provided with gas flowmeter 28, the liquid line 22 is provided with fluid flowmeter 19, water treatment facilities 24
Caused natural gas feeds gas-liquid separator 29 after middle degassing, and the water that gas-liquid separator 29 is isolated feeds water treatment facilities 24 and entered
Row is handled in next step.
The control system includes controller 32 and signal receiver 33, by signal-transmitting cable 34 and electric power system
Frequency converter 17 is connected, to the monitoring working condition of frequency converter 17, and being implemented remotely to frequency converter 17 by controller 32 in real time
Control, pass through control valve 23, temperature sensor 21, pressure sensor in signal-transmitting cable 34 and produced water treatment system
20th, fluid flowmeter 19, metering device 26 connect, and implement monitoring produced water treatment working state of system by controller 32, and
Realize to produced water treatment system remote control, by signal-transmitting cable 34 with extraction gas processing system in control valve 23,
Temperature sensor 21, pressure sensor 20, gas flowmeter 28 connect, and implement monitoring extraction gas processing system by controller 32
Working condition, and realize to producing gas processing system remote control.
Step 4, arrangement heating system, heating system include ground supply system and insulated tubing heating system；Decompression is opened
After adopting, water injection well Ground device is removed one by one, and arranges ground supply system, water injection well ground supply system as shown in Figure 5
System schematic diagram, the ground supply system include electric power system, water system and control system.
The electric power system includes power supply 15, frequency converter 17, ribbon heater attachment means 36, by power cable 16 and water injection well
Mouth 37 is sequentially connected, and by adjusting the power output of frequency converter 17, and then adjusts ribbon heater in shaft bottom heating power.
The water system includes water treatment facilities 24, water storage device 25, metering device 26, supercharging device 35, liquid flow
Gauge 19, temperature sensor 21, pressure sensor 20, the water treatment facilities 24, water storage device 25, supercharging device 35, liquid
Flowmeter 19, temperature sensor 21, pressure sensor 20 are sequentially connected via liquid line 22 and water injection well 37, at the water
Manage device 24 and connect water source, injection water is filtered, degassing process, the water after filtering is fed into water storage device 25, the storage
The inside of water installations 25 is provided with metering device 26, and to monitor the inside water-holding quantity of water storage device 25, the supercharging device 35 is injection
Water provides operating pressure, and the fluid flowmeter 19, pressure sensor 20 and temperature sensor 21 record water system work in real time
Make data.
The control system includes controller 32 and signal receiver 33, by signal-transmitting cable 34 and electric power system
Frequency converter 17 is connected, to the monitoring working condition of frequency converter 17, and being implemented remotely to frequency converter 17 by controller 32 in real time
Control, pass through temperature sensor 21, pressure sensor 20, fluid flowmeter 19, increasing in signal-transmitting cable 34 and water system
Pressure device 35, metering device 26 connect, and implement monitoring water system working condition by controller 32, and realize to water system
Remote control.
Insulated tubing heating system in the step 4, including insulated tubing 38, ribbon heater 39, centralizer 13, packer 40
And horn mouth 41, as shown in fig. 6, insulated tubing internal structure schematic diagram, the inwall of insulated tubing 38 is fixed in the ribbon heater 39,
Fig. 6 A are insulated tubing internal structure top view, and Fig. 6 B are insulated tubing internal structure sectional view；As shown in fig. 7, insulated tubing
Heating system schematic diagram, in water injection well, tripping in horn mouth 41, insulated tubing 38, packer 40, centralizer 13 successively, loudspeaker
Mouthfuls 41 reach predeterminated positions after packer 40 is sealed, to form closed water filling space, ribbon heater 39 is four in the present embodiment.
Step 5, heating exploitation, injection hot water is stored to gas hydrates by water injection well, and day is collected from producing well
Right gas and stratum water, injection water and work electricity consumption are provided to insulated tubing heating system by ground supply system, in insulation oil
Hot water is generated in pipe 38 and is injected in gas hydrates reservoir 3, injected water volume, injection rate are adjusted by supercharging device 35,
Power output of the power supply 15 to insulated tubing heating system is adjusted by frequency converter 17, natural gas and ground are collected by producing well 2
Layer water.
Claims (7)
- A kind of 1. method of parallel water horizontal well exploitation of gas hydrate, it is characterised in that methods described comprises the steps：Step 1, arrangement horizontal-well network, with reference to geologic information, arrangement parallel, horizontal well pattern is stored to target, two mouthfuls of horizontal saliva are put down in well pattern Well is one group, is carried positioned at storage high-order bit well as water injection well, lower curtate position well as producing well by parallel level distribution well Height can employ gas hydrates reserves；Step 2, completion practice, parallel, horizontal well pattern arrangement carry out supporting completion practice after completing；Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, implement to water injection well and producing well Decompression exploitation, until without economic benefit；Step 4, arrangement heating system, heating system include ground supply system and insulated tubing heating system；Step 5, heating exploitation, injection hot water is stored to gas hydrates by water injection well, and natural gas is collected from producing well And stratum water.
- A kind of 2. method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that the water filling Well horizontal segment bearing of trend and the producing well horizontal segment bearing of trend can be in the same direction or reverse.
- 3. a kind of method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that described supporting Completion practice is divided into straight well section completion and horizontal segment completion, and straight well section depth is more than horizontal segment in the straight well section completion, is formed Liquid storage chamber；The horizontal segment completion is well-case perforating completion.
- A kind of 4. method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that the decompression Exploit as the tripping in electric submersible pump in water injection well and producing well, shaft bottom is drawn water by oil pipe, passes through oil pipe and casing annulus part Gas production.
- A kind of 5. method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that the decompression The supporting ground system of producing well includes electric power system, produced water treatment system, extraction gas processing system and control system in exploitation, The electric power system includes power supply, frequency converter；The produced water treatment system includes water storage device, water treatment facilities, regulating valve Door, temperature sensor, pressure sensor, fluid flowmeter；The extraction gas processing system includes warehousing and transportation facilities, natural gas processing Equipment, gas-liquid separator, control valve, temperature sensor, pressure sensor, gas flowmeter；The control system includes control Device and signal receiver processed.
- A kind of 6. method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that the ground Feed system includes electric power system, water system and control system, and the electric power system includes power supply, frequency converter, ribbon heater company Connection device；The water system includes water treatment facilities, water storage device, metering device, supercharging device, fluid flowmeter, temperature Sensor, pressure sensor；The control system includes controller and signal receiver.
- 7. a kind of method of parallel water horizontal well exploitation of gas hydrate as claimed in claim 1, it is characterised in that described heat-insulated Oil tube heating system includes insulated tubing, ribbon heater, centralizer, packer and horn mouth.
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| CN111119798A (en) * | 2019-11-15 | 2020-05-08 | 东北石油大学 | A kind of natural gas hydrate slurry extraction device |
| WO2022206713A1 (en) * | 2021-03-29 | 2022-10-06 | 北京红蓝黑能源科技有限公司 | Method and device for heating formation water directionallay and quantitatively in delayed manner |
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