CN107575195A - A kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation - Google Patents
A kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation Download PDFInfo
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- CN107575195A CN107575195A CN201710988143.1A CN201710988143A CN107575195A CN 107575195 A CN107575195 A CN 107575195A CN 201710988143 A CN201710988143 A CN 201710988143A CN 107575195 A CN107575195 A CN 107575195A
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Abstract
A kind of method that gas hydrates parallel water horizontal well mixed phase drives 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 downhole injection system are arranged in injection well, segmentation injection carbon dioxide and chemical agent are stored to gas hydrates by injection well, and natural gas and recovered water are collected from producing well；The present invention is applied to low permeability, poor connectivity, the storage that storage is thick, gas hydrates saturation degree is low, horizontal well by arranging from parallel distribution to target storage, which improves, can employ gas hydrates reserves, injection carbon dioxide is segmented by injection well and chemical agent implements exploitation, gas production efficiency can be improved, improve ultimate recovery, increase economic benefit.
Description
Technical field
A kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation, belong to the production technique of gas hydrates
Field.
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.
The content of the invention
The present invention relates to a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation, 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 implements fracturing work after decompression exploitation until without economic benefit to horizontal well, then in injection well arrangement ground supply system
Gas hydrates are stored segmentation injection carbon dioxide and chemical agent by injection well by system and downhole injection system, and from life
Production well is collected to natural gas and recovered water；The present invention is applied to low permeability, poor connectivity, storage thickness, natural gas hydration
The low storage of thing saturation degree, permeability is low, in poor connectivity, the storage that storage is thick, gas hydrates saturation degree is low, injection
Due to the restriction of storage condition when chemical agent is exploited, it is smaller that chemical agent involves scope, it is difficult to contacts the natural gas in hypotonic duct
Hydrate, and when injecting carbon dioxide, because the mobility of carbon dioxide is strong, it is larger to involve scope, can touch hypotonic hole
Gas hydrates in road, but because newly-generated carbon dioxide hydrate has wrapped gas hydrates and prevents down
The displacement of one step, carbon dioxide replacement reaction speed are slower；It is that therefore the present invention combines two kinds of recovery methods, by injecting dioxy
Change the connectedness that carbon increase is difficult to involve duct originally, catalysis is implemented to the gas hydrates in duct by injecting chemical agent
Decompose, can improve can employ gas hydrates reserves, can improve gas production efficiency, improve ultimate recovery, increase economic benefit.
To achieve these goals, the invention provides the side that a kind of gas hydrates parallel water horizontal well mixed phase drives exploitation
Method, 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 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 injection 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 injected system, injected system include ground supply system and downhole injection system；
Step 6, displacement exploitation, segmentation injection carbon dioxide and chemical agent are stored to gas hydrates by injection well,
And collect natural gas and stratum water from producing well.
Parallel, horizontal well pattern includes in the step 1：The 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 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 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 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, 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 injection well horizontal segment pressure break, producing well horizontal segment pressure break, injection well horizontal segment and producing well horizontal segment concurrent fracturing；The pressure
Splitting can be adjusted for conventional fracturing process, fracture length according to actual storage situation.
Ground supply system described in the step 5 includes chemical agent system, carbon dioxide system and control system.
The chemical agent system includes water treatment facilities, agitating device, chemical agent storage tank, control valve, water storage device, meter
Measure device, supercharging device, fluid flowmeter, temperature sensor, pressure sensor, the water treatment facilities by liquid line with
Agitating device is connected, and the chemical agent storage tank is connected by liquid line with agitating device, and the liquid line is provided with
Control valve and fluid flowmeter, the agitating device, water storage device, supercharging device, fluid flowmeter, temperature sensor, pressure
Force snesor is sequentially connected via liquid line and injection well head；The water treatment facilities connects water source, and injection water was carried out
Filter, the processing of sudden and violent oxygen, the water after filtering is fed into agitating device, metering device is provided with inside the water storage device, to monitor storage
Water-holding quantity inside water installations, the supercharging device provide operating pressure, the control valve, fluid flow for injection chemical agent
Meter, pressure sensor and temperature sensor record chemical agent systems operations data in real time；The water source include well water, seawater,
Layer recovered water and other conventional source waters, the water treatment facilities are included with filtering, the conventional water treatment equipment of sudden and violent oxygen function, institute
Stating chemical agent storage tank includes the conventional vessel with chemical agent store function, and the water storage device, which includes water pot and other, to be had
The container of water storage function is deposited, the metering device, which includes tank gage and other, has the device for measuring water level function, the increasing
Pressure device include water pump, pump truck and other there is the conventional supercharging device of liquid function of increasing pressure, the control valve, TEMP
Device, pressure sensor, fluid flowmeter, liquid line are conventional equipment.
The carbon dioxide system includes carboloy dioxide storage plant, supercharging device, control valve, gas flowmeter, temperature
Sensor, pressure sensor are spent, the carboloy dioxide storage plant is connected by gas line with supercharging device entrance, described
Supercharging device outlet by gas line with inject well head is connected, the control valve, gas flowmeter, temperature sensor,
Positioned at connection supercharging device with injecting on the gas line of well head, the supercharging device carries pressure sensor for injection carbon dioxide
For operating pressure, the control valve, gas flowmeter, pressure sensor and temperature sensor record carbon dioxide system in real time
Operational data；The carboloy dioxide storage plant, which includes gas cylinder and other, has the storage carbon functional conventional equipment of titanium dioxide, institute
Stating supercharging device and including air pump and other has the conventional supercharging device of gas boosting function, the control valve, TEMP
Device, pressure sensor, gas flowmeter, gas line are conventional equipment.
The control system includes controller and signal receiver, by signal-transmitting cable with being adjusted in chemical agent system
Valve, temperature sensor, pressure sensor, fluid flowmeter, supercharging device, metering device connection, implement to supervise by controller
Chemical agent working state of system is surveyed, and realizes and chemical agent system remote is controlled；Pass through signal-transmitting cable and carbon dioxide system
Supercharging device, control valve, temperature sensor, pressure sensor, gas flowmeter connection in system, implement to monitor by controller
Carbon dioxide system working condition, and realize to carbon dioxide system remote control；The controller includes computer, flat board electricity
Brain and other there is the conventional equipment of control function, the signal receiver be received with signal, the routine of transformation function
Equipment.
Downhole injection system in the step 5, including insulated tubing, centralizer, packer and horn mouth, in injection well
Interior, tripping in horn mouth, insulated tubing, packer, centralizer, horn mouth seal packer after reaching predeterminated position successively, with
Form closed Injection Space, the packer, centralizer can be one or multiple, and the packer, centralizer are
Can be conventional equipment with the matching used conventional equipment of insulated tubing, the insulated tubing, horn mouth, according to the specific feelings of storage
Condition can adjust different model.
Displacement exploitation specific implementation process is that the displacement stages of mining is to be stored up to gas hydrates in the step 6
0.3 times of pore volume gaseous carbon dioxide is injected in Tibetan, 0.1 times of pore volume chemical agent is subsequently injected into, then implements titanium dioxide
Carbon and chemical agent are alternately injected with foregoing injection rate, and collect natural gas and stratum water from producing well；The carbon dioxide is gas
State carbon dioxide；The source water is handled through sudden and violent oxygen can reduce content of oxygen dissolved in water, and improve water source coolant-temperature gage, injection storage
After can increase gas hydrate dissociation speed；The chemical agent composition is for 5% mass than methanol, 5% mass than ethanol, 3%
For quality than DTAC, remaining components are that source water, methanol and ethanol can change hydration as catalyst
The phase balance condition that thing is formed, hydrate equilibrium temperature is reduced, to increase decomposition of hydrate speed, trimethyl chlorination
Ammonium uses as clay stabilizer, can prevent clay particle expansion pollution to caused by storage in storage.
In horizontal production well gas production process, by controlling 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；Carbon dioxide content in periodic monitor produced gas, reduction aerogenesis can be taken when carbon dioxide content is too high in production process
Speed, reduce carbon dioxide injection amount, increase chemical agent injection rate and other regulating measures.
Beneficial effect of the present invention is：
1) present invention is exploited by voltage drop method to injection well and producing well first, is exploited with ensuring to drive in follow-up mixed phase
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 stores segmentation injection carbon dioxide and chemical agent to gas hydrates by downhole injection system, can
Suitable for permeability is low, poor connectivity, the storage that storage is thick, gas hydrates saturation degree is low, increased by injecting carbon dioxide
Add the connectedness for being difficult to involve duct originally, catalytic decomposition implemented to the gas hydrates in duct by injecting chemical agent,
Can improve can employ gas hydrates reserves, can improve gas production efficiency, improve ultimate recovery, increase economic benefit, can add
Fast gas hydrate dissociation speed simultaneously suppresses clay swelling and polluted to caused by storage, and being segmented the mode of injection can save into
This, and the inventive method job safety is reliable.
4) present invention greatly limit increase can employ gas hydrates reserves by parallel water horizontal well mode well spacing,
Injected by high-order bit, and packer be provided with 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.
5) it is connective to increase storage by way of pressure break by the present invention, can increase low permeability, poor connectivity, storage it is thick,
The low storage of gas hydrates 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 injection well pressure break schematic diagram.
Fig. 7 is producing well pressure break schematic diagram.
Fig. 8 is injection well and producing well concurrent fracturing schematic diagram.
Fig. 9 is injection well ground supply system schematic.
Figure 10 is downhole injection system schematic diagram.
Drawing reference numeral：1st, 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, applications of coiled tubing unit 37, pressure break liquid container
38th, agitating device 39, fracture well head 40, fracturing fracture 41, methanol tank 42, ethanol storage tank 43, injection well head 44, two
Carbonoxide storage device 45, insulated tubing 46, packer 47, horn mouth.
Embodiment
The embodiment of the present invention provides a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation, methods described bag
Include：With reference to geologic information, arrangement parallel, horizontal well pattern and supporting completion practice are stored to target, is implemented after completion by horizontal well
Decompression exploitation implements fracturing work after decompression exploitation until without economic benefit to horizontal well, is then supplied on injection well arrangement ground
To system and downhole injection system, segmentation injection carbon dioxide and chemical agent are stored to gas hydrates by injection well, 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 that gas hydrates parallel water horizontal well mixed phase drives exploitation, methods described
Comprise 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 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, injection well 1 are distributed in the same direction with producing well 2, injection well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and 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, injection well 1 are reversely distributed with producing well 2, injection well 1
Horizontal segment depth of setting is less than the horizontal segment depth of setting of producing well 2, and 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 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 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, 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
35th, pressure sensor 20, temperature sensor 21, fluid flowmeter 19, applications of coiled tubing unit 36, controller 32 and signal receiver
33, wherein agitating device 38, pressure break liquid container 37, supercharging device 35, pressure sensor 20, temperature sensor 21 and fluid flow
Meter 19 is connected to applications of coiled tubing unit 36 one by one by liquid line 22, and fracture well head 39 is connected by applications of coiled tubing unit 36, controls
Device 32 and signal receiver 33 processed pass through signal-transmitting cable 34 and the internal metering devices 26 of pressure break liquid container 37, supercharging device
35th, pressure sensor 20, temperature sensor 21, fluid flowmeter 19 connect, and implement monitoring frac system work by controller 32
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 note
Enter well horizontal segment pressure break, producing well horizontal segment pressure break, injection well horizontal segment and producing well horizontal segment concurrent fracturing；As shown in Figure 6
Injection well pressure break schematic diagram, fracturing fracture 40 are located at the horizontal segment of injection well 1；The schematic diagram of producing well pressure break shown in Fig. 7, fracturing fracture
40 are located at the horizontal segment of producing well 2；Injection well shown in Fig. 8 and producing well concurrent fracturing schematic diagram, fracturing fracture 40 are located at injection well 1
Horizontal segment and the horizontal segment of producing well 2；The pressure break is conventional fracturing process, and fracture length can be carried out according to actual storage situation
Adjustment.
Step 5, arrangement injected system, injected system include ground supply system and downhole injection system；Note as shown in Figure 9
Enter well ground supply system schematic, the ground supply system includes chemical agent system, carbon dioxide system and control system.
The chemical agent system includes water treatment facilities 24, agitating device 38, methanol tank 41, ethanol storage tank 42, regulation
Valve 23, water storage device 25, metering device 26, supercharging device 35, fluid flowmeter 19, temperature sensor 21, pressure sensor
20, the water treatment facilities 24 is connected by liquid line 22 with agitating device 38, the methanol tank 41, ethanol storage tank 42
It is connected by liquid line 22 with agitating device 38, the liquid line 22 is provided with control valve 23 and fluid flowmeter
19, the agitating device 38, water storage device 25, supercharging device 35, fluid flowmeter 19, temperature sensor 21, pressure sensor
20 are sequentially connected via liquid line 22 and injection well head 43；The water treatment facilities 24 connects water source, and injection water was carried out
Filter, the processing of sudden and violent oxygen, the water after filtering being fed into agitating device 38, the inside of water storage device 25 is provided with metering device 26, to
The inside water-holding quantity of water storage device 25 is monitored, the supercharging device 35 provides operating pressure, the control valve 23, liquid for injection water
Flowmeter body 19, pressure sensor 20 and temperature sensor 21 record chemical agent systems operations data in real time.
The carbon dioxide system includes carboloy dioxide storage plant 44, supercharging device 35, control valve 23, gas flow
Meter 28, temperature sensor 21, pressure sensor 20, the carboloy dioxide storage plant 44 pass through gas line 27 and supercharging device
35 entrances are connected, and the outlet of supercharging device 35 is connected by gas line 27 with injection well head 43, the control valve
23rd, gas flowmeter 28, temperature sensor 21, pressure sensor 20 are positioned at connection supercharging device 35 and the gas for injecting well head 43
On pipeline 27, the supercharging device 35 provides operating pressure, the control valve 23, gas flowmeter for injection carbon dioxide
28th, pressure sensor 20 and temperature sensor 21 record carbon dioxide system operational data in real time.
The control system includes controller 32 and signal receiver 33, passes through signal-transmitting cable 34 and chemical agent system
Middle control valve 23, temperature sensor 21, pressure sensor 20, fluid flowmeter 19, supercharging device 35, metering device 26 connect
Connect, monitoring chemical agent working state of system is implemented by controller 32, and realize and chemical agent system remote is controlled；Pass through signal
Transmission cable 34 and supercharging device 35, control valve 23, temperature sensor 21, pressure sensor 20, gas in carbon dioxide system
Flowmeter body 28 connects, and implements monitoring carbon dioxide system working condition by controller 32, and realize to carbon dioxide system
Remote control.
Downhole injection system in the step 5, including insulated tubing 45, centralizer 13, packer 46 and horn mouth 47, such as
Shown in Figure 10, downhole injection system schematic diagram, injecting into well, successively tripping in horn mouth 47, insulated tubing 45, packer 46,
Centralizer 13, horn mouth 47 seals packer 46 after reaching predeterminated position, to form closed Injection Space.
Step 6, displacement exploitation, injection carbon dioxide and chemistry are segmented to gas hydrates reservoir 3 by injection well 1
Agent, the displacement stages of mining are that 0.3 times of pore volume gaseous carbon dioxide is injected in being stored to gas hydrates, then note
Enter 0.1 times of pore volume chemical agent, then implement carbon dioxide and chemical agent and alternately injected with foregoing injection rate；Inject titanium dioxide
Carboloy dioxide storage plant 44 is exported into opening during carbon, supercharging device 35 is fed carbon dioxide into by gas line 27, passed through
Supercharging device 35 provides operating pressure for injection carbon dioxide, is injected via injection well head 43 in gas hydrates reservoir 3；Note
Implement filtering, the processing of sudden and violent oxygen when entering chemical agent to source water by water treatment facilities 24, the water after processing is fed into agitating device
38, and control valve 23 is opened, the methanol in methanol tank 41 flows into agitating device via control valve 23, fluid flowmeter 19
In 38, the ethanol in ethanol storage tank 42 is flowed into agitating device 38 via control valve 23, fluid flowmeter 19, and is filled from stirring
Put 38 entrances and add DTAC, the source water, methanol, ethanol, DTAC exist
It is sufficiently stirred in agitating device 38, and gas hydrates storage is injected via water storage device 25, supercharging device 35, injection well head 43
In layer 3, and natural gas and stratum water are collected from producing well 2；The chemical agent composition is that 5% mass compares second than methanol, 5% mass
Than DTAC, remaining components are source water for alcohol, 3% mass.
Claims (10)
1. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation, it is characterised in that methods described includes following
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 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 injection 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 injected system, injected system include ground supply system and downhole injection system；
Gas hydrates are stored and are segmented injection carbon dioxide and chemical agent by step 6, displacement exploitation by injection well, and from
Producing well collects natural gas and stratum water.
2. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
It can be in the same direction or reverse that injection well horizontal segment bearing of trend, which is stated, with the producing well horizontal segment bearing of trend.
3. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
State supporting completion practice and be divided into straight well section completion and horizontal segment completion, straight well section depth is more than level in the straight well section completion
Section, form liquid storage chamber；The horizontal segment completion is well-case perforating completion.
4. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
It is the tripping in electric submersible pump in injection well and producing well to state decompression exploitation, and shaft bottom is drawn water by oil pipe, passes through oil pipe and sleeve ring
Empty part gas production.
5. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
Stating the supporting ground system of producing well in decompression exploitation includes electric power system, produced water treatment system, extraction gas processing system and control
System processed, the electric power system include power supply, frequency converter；The produced water treatment system include water storage device, water treatment facilities,
Control valve, temperature sensor, pressure sensor, fluid flowmeter；The extraction gas processing system includes warehousing and transportation facilities, natural
Gas disposal equipment, gas-liquid separator, control valve, temperature sensor, pressure sensor, gas flowmeter；The control system
Including controller and signal receiver.
6. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
State frac system include agitating device, pressure break liquid container, supercharging device, pressure sensor, temperature sensor, fluid flowmeter,
Applications of coiled tubing unit, controller and signal receiver.
7. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
It is same including injection well horizontal segment pressure break, producing well horizontal segment pressure break, injection well horizontal segment and producing well horizontal segment to state fracturing work
When pressure break, the pressure break is conventional fracturing process.
8. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
Stating ground supply system includes chemical agent system, carbon dioxide system and control system, and the chemical agent system includes water process
Device, agitating device, chemical agent storage tank, control valve, water storage device, metering device, supercharging device, fluid flowmeter, temperature
Sensor, pressure sensor；The carbon dioxide system includes carboloy dioxide storage plant, supercharging device, control valve, gas
Flowmeter, temperature sensor, pressure sensor；The control system includes controller and signal receiver.
9. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that institute
Stating downhole injection system includes insulated tubing, centralizer, packer and horn mouth.
10. a kind of method that gas hydrates parallel water horizontal well mixed phase drives exploitation as claimed in claim 1, it is characterised in that
The displacement stages of mining is to inject 0.3 times of pore volume gaseous carbon dioxide in being stored to gas hydrates, is subsequently injected into
0.1 times of pore volume chemical agent, then implement carbon dioxide and chemical agent and alternately injected with foregoing injection rate, and received from producing well
Collect natural gas and stratum water；The carbon dioxide is gaseous carbon dioxide；The chemical agent composition is 5% mass than methanol, 5%
For quality than ethanol, 3% mass than DTAC, remaining components are source water.
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