CN107575201A - A kind of method of gas hydrates parallel water horizontal well microwave heating exploitation - Google Patents
A kind of method of gas hydrates parallel water horizontal well microwave heating exploitation Download PDFInfo
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- CN107575201A CN107575201A CN201710986153.1A CN201710986153A CN107575201A CN 107575201 A CN107575201 A CN 107575201A CN 201710986153 A CN201710986153 A CN 201710986153A CN 107575201 A CN107575201 A CN 107575201A
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Abstract
A kind of method of gas hydrates parallel water horizontal well microwave heating exploitation, 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, fracturing work is implemented to horizontal well after decompression exploitation, then ground supply system and underground microwave heating system are arranged in heat supply well, gas hydrates layer is heated by microwave applicator, and natural gas and recovered water are collected from producing well；The storage that the present invention is applied to poor connectivity, storage is thick, gas hydrates saturation degree is low, packaged type heating storage is realized by using coiled tubing and microwave applicator, by the speed for changing heating location, heat power output and water pumping gas production, gas hydrates storage can be achieved and optimize exploitation, gas production efficiency can be improved, increases economic benefit.
Description
Technical field
A kind of method of gas hydrates parallel water horizontal well microwave heating exploitation, belong to the exploitation skill of gas hydrates
Art field, and in particular to a kind of to comprehensively utilize heating and the method for voltage drop method exploitation of gas hydrate.
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 gas hydrates parallel water horizontal well microwave heating exploitation, methods described includes：
With reference to geologic information, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, implements to drop by horizontal well after completion
Press off and adopt until without economic benefit, fracturing work is implemented to horizontal well after decompression exploitation, then arranges ground supply in heat supply well
System and underground microwave heating system, gas hydrates layer is heated by microwave applicator, and from producing well to day
Right gas and recovered water are collected；The storage that the present invention is applied to poor connectivity, storage is thick, gas hydrates saturation degree is low,
Packaged type heating storage is realized by using coiled tubing and microwave applicator, by changing heating location, heat output work
Rate and the speed of water pumping gas production, gas hydrates storage can be achieved and optimize exploitation, gas production efficiency can be improved, increase economic effect
Benefit.
To achieve these goals, the embodiments of the invention provide a kind of heating of gas hydrates parallel water horizontal well microwave
The method of exploitation, methods described comprise 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 heat supply 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 heat supply well and producing well
Implement decompression exploitation, until without economic benefit；
Step 4, fracturing work, in well layout frac system after decompression exploitation, fracturing work is implemented to net horizontal section；
Step 5, arrangement heating system, heating system include ground supply system and underground microwave heating system；
Step 6, heating exploitation, gas hydrates layer is heated by microwave heating system, and day is collected from producing well
Right gas and stratum water.
Parallel, horizontal well pattern includes in the step 1：The heat supply 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 heat supply 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；Producing well and heat supply well horizontal segment completion are barefoot completion, to prevent metal sleeve
Microwave applicator is adversely affected；During operation in the heat supply well and producing well straight well section tripping in electric submersible pump, tripping in is extremely
Straight well section bottom liquid storage chamber, and tripping in sand control installation, sand control installation can prevent that sandstone enters caused by gas hydrate dissociation
Enter in straight well section, prevent sandstone from damaging underground equipment；Specific implementation process is tripping in sand control installation, righting into horizontal well successively
Device, 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, produced water treatment device, control valve, temperature sensor, pressure
Force snesor, fluid flowmeter, it is sequentially connected via liquid line and the outlet of production wellhead oil pipe, passes through fluid flowmeter, pressure
Force snesor and temperature sensor real-time collecting electric submersible pump discharge opeing data, displacement is implemented to control by control valve, passed through
Produced water treatment device is filtered to recovered water, degassing process, and the water after filtering is fed into water storage device to treat in next step
Reason, the water storage device inside is provided with metering device, to monitor water-holding quantity inside water storage device；The water storage device includes water
Tank and other have and deposit the container of water storage function, the metering device, which includes tank gage and other, has measurement water level function
Device, the produced water treatment device includes dissolving the conventional water treatment equipment of airway dysfunction with filtering, in decomposition water, described
Control valve, temperature sensor, pressure sensor, fluid flowmeter, liquid line are conventional equipment.
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 produced water treatment device and gas-liquid separator by gas transmission line with liquid line, it is described defeated
Gas pipeline is provided with gas flowmeter, and the liquid line is provided with fluid flowmeter, produced after being deaerated in produced water treatment device
Raw natural gas feeds gas-liquid separator, and the water that gas-liquid separator separates go out feeds produced water treatment device and carried out at next step
Reason.
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 heat supply 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, implementation steps 4.
Frac system in the step 4, including agitating device, pressure break liquid container, supercharging device, pressure sensor, temperature
Sensor, fluid flowmeter, applications of coiled tubing unit, controller and signal receiver, wherein agitating device, pressure break liquid container, increase
Pressure device, pressure sensor, temperature sensor and fluid flowmeter are connected to applications of coiled tubing unit one by one by liquid line, even
Continuous oil pipe device connection fracture well head, controller and signal receiver are filled by signal-transmitting cable and pressure break liquid container, supercharging
Put, the connection of pressure sensor, temperature sensor, fluid flowmeter, monitoring frac system working condition is implemented by controller, and
Realize to the accurate control of fracturing work；The agitating device include agitator tank, trucd mixer or other there is the conventional of agitating function
Equipment, the pressure break liquid container include wet tank, tank car or other common equipments with storage fracturing fluid function, the increasing
Pressure device include compression pump, fracturing unit truck or other there is the common equipment of function of increasing pressure, the applications of coiled tubing unit includes continuous
The equipment of oil pipe car or other conventional control coiled tubings, the controller include computer, tablet personal computer and other have
The conventional equipment of control function, the signal receiver are the conventional equipment with signal reception, transformation function.
The storage that fracturing work is applied to poor connectivity in the step 4, storage is thick, gas hydrates saturation degree is low,
Increase storage connectedness by way of pressure break, to reach the purpose for improving gas recovery factor；The pressure break embodiment bag
Include heat supply well horizontal segment pressure break, producing well horizontal segment pressure break, heat supply well horizontal segment and producing well horizontal segment concurrent fracturing；The pressure
Splitting can be adjusted for conventional bore hole fracturing process, fracture length according to actual storage situation.
Ground supply system in the step 5, including power supply, frequency converter, applications of coiled tubing unit and power cable, by dynamic
Ground supply system is connected to heat supply well head by power cable one by one, and control system is connected with frequency converter by signal-transmitting cable
Connect, to monitoring frequency converter working condition in real time, and remote control is implemented to frequency converter by controller；The power supply includes hair
Motor, commercial power and various normal power supplies, the applications of coiled tubing unit includes Operation Tubing Aggregate or other conventional controls are continuous
The equipment of oil pipe.
Underground microwave heating system in the step 5, including microwave applicator, centralizer, packer and coiled tubing,
Heat supply shaft bottom, successively by microwave applicator, centralizer, packer by coiled tubing tripping in heat supply well, microwave applicator reaches
Packer is sealed after horizontal segment, the centralizer can be one or multiple, and power cable is located at coiled tubing
It is internal；The packer, centralizer is can be with the matching used conventional equipments of coiled tubing；The microwave applicator is to connect
In coiled tubing and there is the conventional microwave generator of microwave generating function, microwave occurrence frequency can be real according to actual storage condition
Apply adjustment.
Heating exploitation specific implementation process is in the step 6, and gas hydrates layer is heated by microwave applicator,
And natural gas and shaft bottom water are collected from producing well, heating electric is supplied to microwave applicator by power supply, adjusted by frequency converter
Power supply is to the power output of microwave applicator, and microwave applicator is moveable in horizontal segment, by adjusting coiled tubing tripping in
Length in well, microwave applicator is can adjust in the position of heat supply well horizontal segment, to realize that diverse location, different capacity can adjust
Formula heats, and natural gas is implemented to exploit from producing well.
In horizontal production well gas production process, by controlling the output of heat supply well heat and producing well to produce gas and water discharge capacity, and then
Producing well hydrodynamic face and flowing bottomhole pressure (FBHP) are adjusted, it is rational by adjusting between making producing well flowing bottomhole pressure (FBHP) holding 1.5-4Mpa
Mining speed, control produced gas water content, temperature, to suppress to be formed gas hydrates in pit shaft, and keep higher gas production
Speed.
Beneficial effect of the present invention is：
1) present invention is exploited by voltage drop method to heat supply well and producing well first, to ensure to open in the heating of follow-up microwave
When adopting will not it is too high because the bottom pressure that hydrate largely decomposes and occurs, natural gas flow velocity is too fast to caused by underground equipment
Harm, improve the security of exploitation of gas hydrates.
2) present invention production bottom is provided with liquid storage chamber, and the water generated in microwave heating recovery process can enter liquid storage
Chamber is simultaneously discharged via electric submersible pump, makes output gas avoid mixing with water in underground, can effectively reduce containing for natural gas in oil jacket annular space
Water, increase gas upward velocity, and then improve production efficiency.
3) relative to conventional heating methods, gas hydrates storage is heated using microwave applicator, heat damage
Lose small, energy utilization rate is high, and heating location, 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 heat supply 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.
5) present invention increases storage connectedness by way of pressure break, can increase poor connectivity, storage thickness, natural gas hydration
The low storage of thing saturation degree is connective, to reach the purpose for improving gas recovery factor.
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 frac system ground schematic diagram.
Fig. 6 is heat supply well pressure break schematic diagram.
Fig. 7 is producing well pressure break schematic diagram.
Fig. 8 is heat supply well and producing well concurrent fracturing schematic diagram.
Fig. 9 is heat supply well ground supply system schematic.
Figure 10 is underground microwave heating system schematic diagram.
Drawing reference numeral：1st, heat supply 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, sand control installation 11, electric submersible pump 12, centralizer 13, liquid storage chamber 14,
Power supply 15, power cable 16, frequency converter 17, production wellhead 18, fluid flowmeter 19, pressure sensor 20, temperature pass
It is sensor 21, liquid line 22, control valve 23, produced water treatment device 24, water storage device 25, metering device 26, defeated
Gas pipeline 27, gas flowmeter 28, gas-liquid separator 29, gas treatment equipment 30, warehousing and transportation facilities 31, controller
32nd, signal receiving device 33, signal-transmitting cable 34, fracture well head 35, applications of coiled tubing unit 36, supercharging device 37, pressure
Liquid container 38, agitating device 39, fracturing fracture 40, heat supply well head 41, coiled tubing 42, packer 43, microwave is split to add
Hot device.
Embodiment
The embodiment of the present invention provides a kind of method of gas hydrates parallel water horizontal well microwave heating exploitation, methods described
Including：With reference to geologic information, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, passes through horizontal well reality after completion
Decompression exploitation is applied until without economic benefit, fracturing work is implemented to horizontal well after decompression exploitation, then arranges ground in heat supply well
Feed system and underground microwave heating system, gas hydrates layer is heated by microwave applicator, and from producing well
Natural gas and recovered water are collected.
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 gas hydrates parallel water horizontal well microwave heating exploitation, the side
Method comprises the following 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 heat supply 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, heat supply well 1 are distributed in the same direction with producing well 2, heat supply well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and heat supply 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, heat supply well 1 are reversely distributed with producing well 2, heat supply well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and heat supply 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 13；Producing well 2 and confession
The completion of 1 horizontal segment of hot well 7 is barefoot completion；The tripping in electric submersible pump 11 in heat supply well 1 and the straight well section 6 of producing well 2, tripping in is to straight
The bottom liquid storage chamber 13 of well section 6, and tripping in sand control installation 10, are drawn water by oil pipe 9 to shaft bottom, pass through oil pipe 9 and the annular space portion of sleeve pipe 8
Divide gas production；Specific implementation process is tripping in sand control installation 10, centralizer 12, electric submersible pump 11 and power electric into horizontal well successively
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 heat supply 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 14, frequency converter 16, by power cable 15 and the entrance of 17 oil pipe of production wellhead 9 successively
Connection, by adjusting the power output of frequency converter 16, and then electric submersible pump 11 is adjusted in shaft bottom drain age velocity.
The produced water treatment system includes water storage device 24, produced water treatment device 23, control valve 22, TEMP
Device 20, pressure sensor 19, fluid flowmeter 18, it is connected by liquid line 21 with the outlet of the oil pipe 9 of production wellhead 17, is passed through
Fluid flowmeter 18, pressure sensor 19 and the discharge opeing data of 20 real-time collecting electric submersible pump of temperature sensor 11, pass through control valve
22 pairs of displacement implement control, recovered water are filtered by produced water treatment device 23, degassing process, by the water after filtering
Water storage device 24 is fed to treat to handle in next step, the inside of water storage device 24 is provided with metering device 25, to monitor water storage dress
Put 24 inside water-holding quantities.
The extraction gas processing system includes warehousing and transportation facilities 30, gas treatment equipment 29, gas-liquid separator 28, regulating valve
Door 22, temperature sensor 20, pressure sensor 19, gas flowmeter 27, are connected to production wellhead via gas transmission line 26 successively
17 sleeve pipes 8 export, by gas flowmeter 27, pressure sensor 19 and the gas production data of 20 real-time collecting sleeve pipe of temperature sensor 8,
Gas production is implemented to control by control valve 22, gas-liquid separation processing, separation are carried out to produced gas by gas-liquid separator 28
Natural gas afterwards feeds natural gas treatment plant 29 and carries out next step processing, including filtration treatment, desulfurization process, dewater treatment,
Natural gas after processing feeds warehousing and transportation facilities 30 and transported, the gas-liquid separator 28, gas treatment equipment 29 and accumulating
Equipment 30 is connected by gas transmission line 26, and gas flowmeter 27 is provided with pipeline.
It is connected between the produced water treatment device 23 and gas-liquid separator 28 by gas transmission line 26 with liquid line 21
Connect, the gas transmission line 26 is provided with gas flowmeter 27, and the liquid line 21 is provided with fluid flowmeter 18, at recovered water
Manage caused natural gas after being deaerated in device 23 and feed gas-liquid separator 28, the water that gas-liquid separator 28 is isolated feeds recovered water
Processing unit 23 is further processed.
The control system includes controller 31 and signal receiver 32, by signal-transmitting cable 33 and electric power system
Frequency converter 16 is connected, to the monitoring working condition of frequency converter 16, and being implemented remotely to frequency converter 16 by controller 31 in real time
Control, pass through control valve 22, temperature sensor 20, pressure sensor in signal-transmitting cable 33 and produced water treatment system
19th, fluid flowmeter 18, metering device 25 connect, and implement monitoring produced water treatment working state of system by controller 31, and
Realize to produced water treatment system remote control, by signal-transmitting cable 33 with extraction gas processing system in control valve 22,
Temperature sensor 20, pressure sensor 19, gas flowmeter 27 connect, and implement monitoring extraction gas processing system by controller 31
Working condition, and realize to producing gas processing system remote control.
Step 4, fracturing work, in well layout frac system after decompression exploitation, fracturing work is implemented to net horizontal section, such as
The schematic diagram of frac system ground shown in Fig. 5, the frac system, including agitating device 38, pressure break liquid container 37, supercharging device
36th, pressure sensor 19, temperature sensor 20, fluid flowmeter 18, applications of coiled tubing unit 35, controller 31 and signal receiver
32, wherein agitating device 38, pressure break liquid container 37, supercharging device 36, pressure sensor 19, temperature sensor 20 and fluid flow
Meter 18 is connected to applications of coiled tubing unit 35 one by one by liquid line 21, and fracture well head 34 is connected by applications of coiled tubing unit 35, controls
Device 31 and signal receiver 32 processed pass through signal-transmitting cable 33 and the internal metering devices 25 of pressure break liquid container 37, supercharging device
36th, pressure sensor 19, temperature sensor 20, fluid flowmeter 18 connect, and implement monitoring frac system work by controller 31
Make state, and realize to the accurate control of fracturing work.
The storage that fracturing work is applied to poor connectivity in step 4, storage is thick, gas hydrates saturation degree is low, passes through
The mode of pressure break increases storage connectedness, to reach the purpose for improving gas recovery factor；The pressure break embodiment includes supplying
Hot well horizontal segment pressure break, producing well horizontal segment pressure break, heat supply well horizontal segment and producing well horizontal segment concurrent fracturing；As shown in Figure 6
Heat supply well pressure break schematic diagram, fracturing fracture 39 are located at the horizontal segment of heat supply well 1；The schematic diagram of producing well pressure break shown in Fig. 7, fracturing fracture
39 are located at the horizontal segment of producing well 2；Heat supply well shown in Fig. 8 and producing well concurrent fracturing schematic diagram, fracturing fracture 39 are located at heat supply well 1
Horizontal segment and the horizontal segment of producing well 2；The pressure break is conventional bore hole fracturing process, and fracture length can be with according to actual storage situation
It is adjusted.
Step 5, arrangement heating system, heating system include ground supply system and underground microwave heating system；By heat supply
Well site ground installation is removed one by one, and arranges ground supply system, heat supply well ground supply system schematic as shown in Figure 9, according to
It is secondary to connect power supply 14, frequency converter 16, applications of coiled tubing unit 35 by power cable 15, by applications of coiled tubing unit 35 and heat supply well
Mouth 40 is connected, and controller 31, signal receiver 32 are connected by signal-transmitting cable 33 with frequency converter 16, to prison in real time
The working condition of frequency converter 16 is surveyed, and remote control is implemented to frequency converter 16 by controller 31；Underground as shown in Figure 10 microwave adds
Hot systems schematic diagram, it is micro- successively by microwave applicator 43, centralizer 12, packer 42 by the tripping in heat supply well 1 of coiled tubing 41
Wave heater 43 seals packer 42 after reaching horizontal segment 7, and power cable 15 is located inside coiled tubing 41.
Step 6, heating exploitation, gas hydrates layer is heated by microwave applicator, and collected naturally from producing well
Gas and stratum water, heating electric is supplied by power supply 14 to microwave applicator 43, and power supply 14 is adjusted to microwave by frequency converter 16
The power output of heater 43, microwave applicator 43 is moveable in horizontal segment 7, by adjusting the G.I.H of coiled tubing 41
Length, microwave applicator 43 is can adjust in the position of heat supply well horizontal segment 7, to realize that diverse location, different capacity can adjust
Formula heats, and natural gas is implemented to exploit from producing well 2.
Claims (9)
- A kind of 1. method of gas hydrates parallel water horizontal well microwave heating exploitation, it is characterised in that under methods described includes State step：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 heat supply 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 heat supply well and producing well Decompression exploitation, until without economic benefit；Step 4, fracturing work, in well layout frac system after decompression exploitation, fracturing work is implemented to net horizontal section；Step 5, arrangement heating system, heating system include ground supply system and underground microwave heating system；Step 6, heating exploitation, gas hydrates layer is heated by microwave heating system, and natural gas is collected from producing well And stratum water.
- A kind of 2. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The heat supply well horizontal segment bearing of trend can be in the same direction or reverse with the producing well horizontal segment bearing of trend 's.
- A kind of 3. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The supporting completion practice is divided into straight well section completion and horizontal segment completion, and straight well section depth is more than level in the straight well section completion Section, form liquid storage chamber；Producing well and heat supply well horizontal segment completion are barefoot completion in the horizontal segment completion.
- A kind of 4. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The decompression exploitation is the tripping in electric submersible pump in heat supply well and producing well, and shaft bottom is drawn water by oil pipe, passes through oil pipe and sleeve pipe Annular section gas production.
- A kind of 5. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that It is described decompression exploitation in the supporting ground system of producing well include electric power system, produced water treatment system, extraction gas processing system and Control system, the electric power system include power supply, frequency converter；The produced water treatment system includes water storage device, at recovered water Manage device, control valve, temperature sensor, pressure sensor, fluid flowmeter；The extraction gas processing system is set including accumulating Standby, gas treatment equipment, gas-liquid separator, control valve, temperature sensor, pressure sensor, gas flowmeter；The control System processed includes controller and signal receiver.
- A kind of 6. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The frac system includes agitating device, pressure break liquid container, supercharging device, pressure sensor, temperature sensor, fluid flow Meter, applications of coiled tubing unit, controller and signal receiver.
- A kind of 7. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The fracturing work includes heat supply well horizontal segment pressure break, producing well horizontal segment pressure break, heat supply well horizontal segment and producing well horizontal segment Concurrent fracturing, the pressure break are conventional bore hole fracturing process.
- A kind of 8. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The ground supply system includes power supply, frequency converter, applications of coiled tubing unit and power cable.
- A kind of 9. method of gas hydrates parallel water horizontal well microwave heating exploitation as claimed in claim 1, it is characterised in that The underground microwave heating system includes microwave applicator, centralizer, packer and coiled tubing.
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| CN109057757A (en) * | 2018-08-24 | 2018-12-21 | 广州海洋地质调查局 | A kind of gas hydrate mining methods and device |
| CN110388205A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating L formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN115306366A (en) * | 2022-09-13 | 2022-11-08 | 中国石油大学(华东) | Efficient yield-increasing exploitation method for natural gas hydrate |
| CN116185088A (en) * | 2023-03-03 | 2023-05-30 | 广东石油化工学院 | Intelligent drainage monitoring system of crude oil storage tank based on PLC |
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| CN104912532A (en) * | 2015-05-12 | 2015-09-16 | 中国科学院力学研究所 | Device and method for exploiting seafloor natural gas hydrates through continuously injecting hot seawater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109057757A (en) * | 2018-08-24 | 2018-12-21 | 广州海洋地质调查局 | A kind of gas hydrate mining methods and device |
| CN110388205A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | Method microwave heating L formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN115306366A (en) * | 2022-09-13 | 2022-11-08 | 中国石油大学(华东) | Efficient yield-increasing exploitation method for natural gas hydrate |
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| CN116185088A (en) * | 2023-03-03 | 2023-05-30 | 广东石油化工学院 | Intelligent drainage monitoring system of crude oil storage tank based on PLC |
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Application publication date: 20180112 |