CN107575197A - A kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate - Google Patents
A kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate Download PDFInfo
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- CN107575197A CN107575197A CN201710991664.2A CN201710991664A CN107575197A CN 107575197 A CN107575197 A CN 107575197A CN 201710991664 A CN201710991664 A CN 201710991664A CN 107575197 A CN107575197 A CN 107575197A
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Abstract
A kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate, belong to the production technique field of gas hydrates.Methods described includes：With reference to geologic information, arrangement row's formula horizontal-well network and supporting completion practice are stored to target, decompression exploitation is implemented until without economic benefit by horizontal well after completion, then ground supply system and downhole injection system are arranged in water injection well, segmentation injection chemical agent and driven water-replacing are stored to gas hydrates by water injection well, and natural gas and recovered water are collected from producing well；The present invention is applied to poor connectivity, stores thin, the saturate storage of gas hydrates, horizontal well by storing from arrangement row formula distribution to target, which improves, can employ gas hydrates reserves, injection chemical agent is segmented by water injection well and driven water-replacing implements exploitation, gas production efficiency can be improved, improve ultimate recovery, increase economic benefit.
Description
Technical field
A kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate, belong to the production technique of gas hydrates
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.
The content of the invention
The present invention relates to a kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate, methods described includes：Knot
Geologic information is closed, arrangement row's formula horizontal-well network and supporting completion practice are stored to target, implements to be depressured by horizontal well after completion
Exploitation then arranges ground supply system and downhole injection system, by water injection well to day until without economic benefit in water injection well
Right gas hydrate storage segmentation injection chemical agent and driven water-replacing, and natural gas and recovered water are collected from producing well；This hair
It is bright to be applied to poor connectivity, store thin, the saturate storage of gas hydrates, it is distributed by storing arrangement row formula to target
Horizontal well improve can employ gas hydrates reserves, by water injection well be segmented injection chemical agent and driven water-replacing implement exploitation,
Gas production efficiency can be improved, improve ultimate recovery, increase economic benefit.
To achieve these goals, the invention provides a kind of side of row's formula horizontal well chemical flooding exploitation of gas hydrate
Method, methods described comprise the steps：
Step 1, arrangement row's formula horizontal-well network, with reference to geologic information, arrangement row's formula horizontal-well network, horizontal well are stored to target
It is divided into water injection well and producing well, gas hydrates reserves can be employed to improve by arranging formula level distribution well；
Step 2, completion practice, row's formula horizontal-well network arrangement carry out supporting completion practice after completing；
Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, to water injection well and producing well
Implement decompression exploitation, until without economic benefit；
Step 4, arrangement flood pattern, flood pattern include ground supply system and downhole injection system；
Step 5, displacement exploitation, segmentation injection chemical agent and driven water-replacing are stored to gas hydrates by water injection well, and
Natural gas and stratum water are collected from producing well.
Formula horizontal-well network is arranged in the step 1 to be included：Water injection well direction described in row's formula horizontal-well network and the life
It can be in the same direction or reverse to produce well direction；The horizontal segment of water injection well and producing well in row's formula horizontal-well network
Can be isometric or non-isometric；Water injection well and producing well can be aligned fashions in row's formula horizontal-well network
Or be dislocatedly distributed；The water injection well horizontal segment depth and the producing well horizontal segment depth can be it is contour,
The water injection well horizontal segment can also be located above or below the producing well horizontal segment；The distance between each well is according to storage bar
Part can change within the specific limits.
Preferably, row's formula horizontal-well network arrangement scope is：Horizontal-well network spacing range 300-1000 rice, horizontal segment length
Spend scope 500-2000 rice.
Supporting completion practice is divided into straight well section completion and horizontal segment completion in the step 2, straight in the straight well section completion
Well section depth is more than horizontal segment depth 5-30 rice, forms liquid storage chamber, to realize that air water point is adopted, reduces produced gas water content, and press down
Gas hydrates are formed in sleeve pipe processed；The horizontal segment completion is well-case perforating completion, perforation fragment position, perforating depth, is penetrated
Hole density can be adjusted according to actual storage situation；Tripping in electricity is latent in the water injection well and producing well straight well section during operation
Pump, tripping in is to straight well section bottom liquid storage chamber, and tripping in sand control installation, sand control installation can prevent gas hydrate dissociation from producing
Sandstone enter straight well section in, prevent sandstone damage underground equipment；Specific implementation process is the tripping in sand control into horizontal well successively
Device, centralizer, electric submersible pump and power cable, the sand control installation, centralizer, electric submersible pump and power cable are conventional
Downhole tool, model can be adapted to according to actual storage situation selection.
The supporting ground system of producing well includes electric power system, produced water treatment system, produced gas processing system in the step 3
System and control system.
The electric power system includes power supply, frequency converter, is sequentially connected, passed through by power cable and production wellhead oil pipe entrance
Power converter output is adjusted, and then adjusts electric submersible pump in shaft bottom drain age velocity；The power supply include generator, commercial power and
Various normal power supplies.
The produced water treatment system includes water storage device, water treatment facilities, control valve, temperature sensor, pressure and passed
Sensor, fluid flowmeter, it is sequentially connected via liquid line and the outlet of production wellhead oil pipe, is passed by fluid flowmeter, pressure
Sensor and temperature sensor real-time collecting electric submersible pump discharge opeing data, displacement is implemented to control by control valve, at water
Reason device is filtered to recovered water, degassing process, the water after filtering is fed into water storage device to treat to handle in next step, the storage
Metering device is provided with inside water installations, to monitor water-holding quantity inside water storage device；The water storage device include water pot and its
He has the container for depositing water storage function, and the metering device, which includes tank gage and other, has the device for measuring water level function,
The water treatment facilities is included with the conventional water treatment equipment that airway dysfunction is dissolved in filtering, decomposition water, the control valve, temperature
It is conventional equipment to spend sensor, pressure sensor, fluid flowmeter, liquid line.
The extraction gas processing system includes warehousing and transportation facilities, gas treatment equipment, gas-liquid separator, control valve, temperature
Sensor, pressure sensor, gas flowmeter are spent, production wellhead cannula exit is connected to via gas transmission line successively, passes through gas
Flowmeter body, pressure sensor and temperature sensor real-time collecting sleeve pipe gas production data, gas production is implemented by control valve
Control, gas-liquid separation processing is carried out to produced gas by gas-liquid separator, the natural gas after separation feeds natural gas treatment plant
Next step processing, including filtration treatment, desulfurization process, dewater treatment are carried out, the natural gas after processing feeds warehousing and transportation facilities and carried out
Transport；The warehousing and transportation facilities include gas transmission line, pressure vessel and other there is the conventional equipment of natural gas accumulating function, it is described
Gas treatment equipment includes
The conventional equipment with gas-liquid separating function, the control valve, temperature sensor, pressure sensor, gas flowmeter, gas transmission
Pipeline is conventional equipment.
It is connected between the water treatment facilities and gas-liquid separator by gas transmission line with liquid line, the appendix
Line is provided with gas flowmeter, and the liquid line is provided with fluid flowmeter, caused natural after being deaerated in water treatment facilities
Gas feeds gas-liquid separator, and the water that gas-liquid separator separates go out feeds water treatment facilities and is further processed.
The control system includes controller and signal receiver, passes through frequency converter in signal-transmitting cable and electric power system
It is connected, to monitoring frequency converter working condition in real time, and remote control is implemented to frequency converter by controller, passed by signal
Transmission cable connects with control valve, temperature sensor, pressure sensor, fluid flowmeter, metering device in produced water treatment system
Connect, monitoring produced water treatment working state of system is implemented by controller, and realize and produced water treatment system remote is controlled, lead to
Signal-transmitting cable is crossed with control valve, temperature sensor, pressure sensor, gas flowmeter in extraction gas processing system to connect
Connect, monitoring extraction gas processing system working condition is implemented by controller, and realize to producing gas processing system remote control；Institute
State controller include computer, tablet personal computer and other there is the conventional equipment of control function, the signal receiver is tool
There is signal to receive, the conventional equipment of transformation function.
The decompression exploitation is embodied as, and shaft bottom is drawn water by electric submersible pump in water injection well and producing well, passes through oil pipe
With the gas production of casing annulus part, underground electric submersible pump discharge capacity is implemented to adjust by frequency converter, when gas production is too low or other
After reason causes no economic benefit, water injection well Ground device is removed one by one, and arrange flood pattern.
Ground supply system described in the step 4 includes water system and control system.
The water system includes water treatment facilities, agitating device, chemical agent storage tank, control valve, water storage device, metering
Device, supercharging device, fluid flowmeter, temperature sensor, pressure sensor, the water treatment facilities is by liquid line with stirring
Mix device to be connected, the chemical agent storage tank is connected by liquid line with agitating device, and the liquid line, which is provided with, to be adjusted
Save valve and fluid flowmeter, the agitating device, water storage device, supercharging device, fluid flowmeter, temperature sensor, pressure
Sensor is sequentially connected via liquid line and water injection well；The water treatment facilities connects water source, injection water is filtered,
Sudden and violent oxygen processing, the water after filtering is fed into agitating device, metering device is provided with inside the water storage device, to monitor water storage dress
Internal water-holding quantity is put, the supercharging device provides operating pressure for injection water, and the control valve, fluid flowmeter, pressure pass
Sensor and temperature sensor record water system operational data in real time；The water source include well water, seawater, stratum recovered water and its
His conventional source water, the water treatment facilities are included with filtering, the conventional water treatment equipment of sudden and violent oxygen function, the chemical agent storage tank
Including the conventional vessel with chemical agent store function, the water storage device include water pot and other have deposit water storage function
Container, the metering device, which includes tank gage and other, has the device for measuring water level function, and the supercharging device includes water
Pump, pump truck and other there is the conventional supercharging device of function of increasing pressure, the control valve, temperature sensor, pressure sensor, liquid
Flowmeter body, liquid line are conventional equipment.
The control system includes controller and signal receiver, passes through regulating valve in signal-transmitting cable and water system
Door, temperature sensor, pressure sensor, fluid flowmeter, supercharging device, metering device connection, implement to monitor by controller
Water system working condition, and realize to water system remote control；The controller include computer, tablet personal computer and its
He has the conventional equipment of control function, and the signal receiver is the conventional equipment with signal reception, transformation function.
Downhole injection system in the step 4, including insulated tubing, centralizer, packer and horn mouth, in water injection well
Interior, tripping in horn mouth, insulated tubing, packer, centralizer, horn mouth seal packer after reaching predeterminated position successively, with
Form closed water filling 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 5
0.1 times of pore volume driven water-replacing is injected in Tibetan, is subsequently injected into 0.1 times of pore volume chemical agent, then implements driven water-replacing and chemistry
Agent is alternately injected with 0.1 times of pore volume, and collects natural gas and stratum water from producing well；The driven water-replacing is conventional source water
Water, content of oxygen dissolved in water can be reduced by being handled through sudden and violent oxygen, and improve water source coolant-temperature gage, can increase natural gas hydration after injection storage
Thing decomposition rate；The chemical agent composition be 5% mass than methanol, 5% mass than ethanol, 3% mass than dodecyl front three
Ammonium chloride, remaining components are the phase balance condition that source water, methanol and ethanol can change gas hydrate synthesis as catalyst,
Hydrate equilibrium temperature is reduced, to increase decomposition of hydrate speed, DTAC makes as clay stabilizer
With, can prevent storage in clay particle expansion to caused by storage pollution.
In horizontal production well gas production process, by controlling water injection well injection rate and producing well to produce gas and water discharge capacity, and then adjust
Whole producing well hydrodynamic face and flowing bottomhole pressure (FBHP), between making producing well flowing bottomhole pressure (FBHP) holding 1.5-4Mpa, pass through and adjust rational row
Speed is adopted, control produced gas water content, temperature, to suppress to be formed gas hydrates in pit shaft, and keeps higher gas production speed
Degree.
Beneficial effect of the present invention is：
1) present invention is exploited by voltage drop method to water injection well and producing well first, to ensure when follow-up displacement is exploited
Will not, natural gas flow velocity too fast to underground equipment caused by danger too high because the bottom pressure that hydrate largely decomposes and occurs
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 chemical agent and driven water-replacing to gas hydrates by downhole injection system, can fit
For poor connectivity, thin, the saturate storage of gas hydrates is stored, gas hydrate dissociation speed can be accelerated and pressed down
Clay swelling processed pollutes to caused by storage, and it is cost-saved to be segmented the mode of injection, and the inventive method job safety is reliable.
4) present invention can adopt gas hydrates reserves by storing the horizontal-well network raising of arrangement row's formula to target, relative to
Traditional straight well well pattern, horizontal well patterns, row's formula horizontal-well network of the present invention can improve in storage to a greater extent can adopt gas water
Compound reserves.
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 horizontal-well network aligned fashion schematic diagram in the same direction.
Fig. 2 is the reverse aligned fashion schematic diagram of horizontal-well network.
Fig. 3 is that horizontal-well network is dislocatedly distributed schematic diagram in the same direction.
Fig. 4 is that horizontal-well network is reversely dislocatedly distributed schematic diagram.
Fig. 5 is horizontal segment depth schematic diagram.
Fig. 6 is decompression exploitation completion schematic diagram.
Fig. 7 is producing well ground configuration schematic diagram.
Fig. 8 is water injection well ground feed system schematic diagram.
Fig. 9 is downhole injection system schematic diagram.
Drawing reference numeral：1st, water injection well 2, producing well 3, gas hydrates reservoir 4, overlying rock 5, lower rock stratum
6th, straight well section 7, horizontal segment 8, sleeve pipe 9, oil pipe 10, perforated interval 11, sand control installation 12, electric submersible pump 13, centralizer 14,
Liquid storage chamber 15, power supply 16, power cable 17, frequency converter 18, production wellhead 19, fluid flowmeter 20, pressure sensor
21st, temperature sensor 22, liquid line 23, control valve 24, water treatment facilities 25, water storage device 26, metering device
27th, gas transmission line 28, gas flowmeter 29, gas-liquid separator 30, gas treatment equipment 31, warehousing and transportation facilities 32, control
Device 33, signal receiving device 34, signal-transmitting cable 35, agitating device 36, methanol tank 37, ethanol storage tank 38, increasing
Pressure device 39, water injection well 40, insulated tubing 41, packer 42, horn mouth.
Embodiment
The embodiment of the present invention provides a kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate, methods described bag
Include：With reference to geologic information, arrangement row's formula horizontal-well network and supporting completion practice are stored to target, is implemented after completion by horizontal well
Decompression exploitation then arranges ground supply system and downhole injection system in water injection well, passes through water injection well until without economic benefit
Gas hydrates are stored with segmentation injection chemical agent and driven water-replacing, and natural gas and recovered water are collected from producing well.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, belongs to the scope of protection of the invention.
The embodiments of the invention provide a kind of method of row's formula horizontal well chemical flooding exploitation of gas hydrate, methods described
Comprise the following steps：
Step 1, arrangement row's formula horizontal-well network, with reference to geologic information, arrangement row's formula horizontal-well network, horizontal well are stored to target
It is divided into water injection well and producing well, gas hydrates reserves can be employed to improve by arranging formula level distribution well, arranges formula horizontal well
Net has following several arrangement modes：
As shown in figure 1, Fig. 1 is horizontal-well network aligned fashion schematic diagram in the same direction, water injection well 1 is distributed in the same direction with producing well 2, note
The horizontal segment of well 1 and the horizontal segment of producing well 2 are in laterally aligned distribution.
As shown in Fig. 2 Fig. 2 is the reverse aligned fashion schematic diagram of horizontal-well network, water injection well 1 is reversely distributed with producing well 2, note
The horizontal segment of well 1 and the horizontal segment of producing well 2 are in laterally aligned distribution.
It is dislocatedly distributed in the same direction schematic diagram as shown in figure 3, Fig. 3 is horizontal-well network, water injection well 1 is distributed in the same direction with producing well 2, note
The horizontal segment of well 1 and the horizontal segment of producing well 2 are distributed in transversion malposition, and after being located at the heel of water injection well 1 at the heel of producing well 2
Side.
Reversely it is dislocatedly distributed schematic diagram as shown in figure 4, Fig. 4 is horizontal-well network, water injection well 1 is reversely distributed with producing well 2, note
The horizontal segment of well 1 and the horizontal segment of producing well 2 are distributed in transversion malposition, and before being located at the heel of water injection well 1 at the tiptoe of producing well 2
Side.
Water injection well horizontal segment is placed with following several ways with producing well horizontal segment depth, as shown in figure 5, deep for horizontal segment
Spend schematic diagram：
Fig. 5 A are that the horizontal segment depth of setting of water injection well 1 is less than the horizontal segment depth of setting of producing well 2, water injection well 1 and producing well 2
Horizontal segment is in gas hydrates reservoir 3, under overlying rock 4, on lower rock stratum 5.
Fig. 5 B are that the horizontal segment depth of setting of water injection well 1 is equal to the horizontal segment depth of setting of producing well 2, water injection well 1 and producing well 2
Horizontal segment is in gas hydrates reservoir 3, under overlying rock 4, on lower rock stratum 5.
Fig. 5 C are that the horizontal segment depth of setting of water injection well 1 is more than the horizontal segment depth of setting of producing well 2, water injection well 1 and producing well 2
Horizontal segment is in gas hydrates reservoir 3, under overlying rock 4, on lower rock stratum 5.
Step 2, completion practice, row's formula horizontal-well network arrangement carry out supporting completion practice after completing, and decompression as shown in Figure 6 is opened
Completion schematic diagram is adopted, the straight well section 6 pierces depth and pierces depth more than horizontal segment 7, forms liquid storage chamber 14；The horizontal segment 7
Completion is well-case perforating completion, and perforated interval 10 is located on horizontal segment 7；Tripping in electricity is latent in water injection well 1 and the straight well section 6 of producing well 2
Pump 12, tripping in the bottom liquid storage chamber 14 of straight well section 6, and tripping in sand control installation 11, are drawn water to shaft bottom by oil pipe 9, pass through oil pipe 9
With the annular section gas production of sleeve pipe 8；Specific implementation process is tripping in sand control installation 11, centralizer 13, electricity are latent into horizontal well successively
Pump 12 and power cable, do not regard in power cable figure.
Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, to water injection well and producing well
Implement decompression exploitation, until without economic benefit, producing well ground configuration schematic diagram as shown in Figure 7, the supporting ground of producing well
System includes electric power system, produced water treatment system, extraction gas processing system and control system.
The electric power system includes power supply 15, frequency converter 17, by power cable 16 and the entrance of 18 oil pipe of production wellhead 9 successively
Connection, by adjusting the power output of frequency converter 17, and then electric submersible pump 12 is adjusted in shaft bottom drain age velocity.
The produced water treatment system includes water storage device 25, water treatment facilities 24, control valve 23, temperature sensor
21st, pressure sensor 20, fluid flowmeter 19, it is connected by liquid line 22 with the outlet of the oil pipe 9 of production wellhead 18, passes through liquid
Flowmeter body 19, pressure sensor 20 and the discharge opeing data of 21 real-time collecting electric submersible pump of temperature sensor 12, pass through control valve 23
Displacement is implemented to control, recovered water filtered by water treatment facilities 24, degassing process, the water after filtering is fed into storage
Water installations 25 are to treat to handle in next step, and the inside of water storage device 25 is provided with metering device 26, to monitor in water storage device 25
Portion's water-holding quantity.
The extraction gas processing system includes warehousing and transportation facilities 31, gas treatment equipment 30, gas-liquid separator 29, regulating valve
Door 23, temperature sensor 21, pressure sensor 20, gas flowmeter 28, are connected to production wellhead via gas transmission line 27 successively
18 sleeve pipes 8 export, by gas flowmeter 28, pressure sensor 20 and the gas production data of 21 real-time collecting sleeve pipe of temperature sensor 8,
Gas production is implemented to control by control valve 23, gas-liquid separation processing, separation are carried out to produced gas by gas-liquid separator 29
Natural gas afterwards feeds natural gas treatment plant 30 and carries out next step processing, including filtration treatment, desulfurization process, dewater treatment,
Natural gas after processing feeds warehousing and transportation facilities 31 and transported, the gas-liquid separator 29, gas treatment equipment 30 and accumulating
Equipment 31 is connected by gas transmission line 27, and gas flowmeter 28 is provided with pipeline.
It is connected between the water treatment facilities 24 and gas-liquid separator 29 by gas transmission line 27 with liquid line 22, institute
State gas transmission line 27 and be provided with gas flowmeter 28, the liquid line 22 is provided with fluid flowmeter 19, water treatment facilities 24
Caused natural gas feeds gas-liquid separator 29 after middle degassing, and the water that gas-liquid separator 29 is isolated feeds water treatment facilities 24 and entered
Row is handled in next step.
The control system includes controller 32 and signal receiver 33, by signal-transmitting cable 34 and electric power system
Frequency converter 17 is connected, to the monitoring working condition of frequency converter 17, and being implemented remotely to frequency converter 17 by controller 32 in real time
Control, pass through control valve 23, temperature sensor 21, pressure sensor in signal-transmitting cable 34 and produced water treatment system
20th, fluid flowmeter 19, metering device 26 connect, and implement monitoring produced water treatment working state of system by controller 32, and
Realize to produced water treatment system remote control, by signal-transmitting cable 34 with extraction gas processing system in control valve 23,
Temperature sensor 21, pressure sensor 20, gas flowmeter 28 connect, and implement monitoring extraction gas processing system by controller 32
Working condition, and realize to producing gas processing system remote control.
Step 4, arrangement flood pattern, flood pattern include ground supply system and downhole injection system；After decompression exploitation,
Water injection well Ground device is removed one by one, and arranges ground supply system, water injection well ground feed system signal as shown in Figure 8
Figure, the ground supply system include water system and control system.
The water system includes water treatment facilities 24, agitating device 35, methanol tank 36, ethanol storage tank 37, regulating valve
Door 23, water storage device 25, metering device 26, supercharging device 38, fluid flowmeter 19, temperature sensor 21, pressure sensor 20,
The water treatment facilities 24 is connected by liquid line 22 with agitating device 35, and the methanol tank 36, ethanol storage tank 37 are logical
Liquid line 22 to be crossed with agitating device 35 to be connected, the liquid line 22 is provided with control valve 23 and fluid flowmeter 19,
The agitating device 35, water storage device 25, supercharging device 38, fluid flowmeter 19, temperature sensor 21, pressure sensor 20 pass through
It is sequentially connected by liquid line 22 and water injection well 39；The water treatment facilities 24 connects water source, and injection water is filtered, cruelly
Oxygen processing, the water after filtering is fed into agitating device 35, the inside of water storage device 25 is provided with metering device 26, to monitor storage
The inside water-holding quantity of water installations 25, the supercharging device 38 provide operating pressure, the control valve 23, fluid flow for injection water
Meter 19, pressure sensor 20 and temperature sensor 21 record water system operational data in real time.
The control system includes controller 32 and signal receiver 33, by signal-transmitting cable 34 and water system
Control valve 23, temperature sensor 21, pressure sensor 20, fluid flowmeter 19, supercharging device 38, metering device 26 connect,
Monitoring water system working condition is implemented by controller 32, and realized to water system remote control.
Downhole injection system in the step 4, including insulated tubing 40, centralizer 13, packer 41 and horn mouth 42, such as
Shown in Fig. 9, downhole injection system schematic diagram, in water injection well, successively tripping in horn mouth 42, insulated tubing 40, packer 41, help
Positive device 13, horn mouth 42 seals packer 41 after reaching predeterminated position, to form closed water filling space.
Step 5, displacement exploitation, injection chemical agent and driven water-replacing are segmented to gas hydrates reservoir 3 by water injection well 1,
The displacement stages of mining is to inject 0.1 times of pore volume driven water-replacing in being stored to gas hydrates, is subsequently injected into 0.1 times of hole
Gap volume chemical agent, then implement driven water-replacing and chemical agent and alternately injected with 0.1 times of pore volume；Pass through water when injecting driven water-replacing
Processing unit 24 implements filtering, the processing of sudden and violent oxygen to source water, and the water after processing is fed into agitating device 35, and via water storage device
25th, supercharging device 38, water injection well 39 are injected in gas hydrates reservoir 3, note closing control valve 23 during driven water-replacing；
Implement filtering, the processing of sudden and violent oxygen when injecting chemical agent to source water by water treatment facilities 24, the water after processing is fed into stirring dress
35 are put, and opens control valve 23, the methanol in methanol tank 36 flows into stirring dress via control valve 23, fluid flowmeter 19
In putting 35, ethanol in ethanol storage tank 37 is flowed into agitating device 35 via control valve 23, fluid flowmeter 19, and from stirring
The entrance of device 35 adds DTAC, the source water, methanol, ethanol, DTAC
It is sufficiently stirred in agitating device 35, and gas hydrates is injected via water storage device 25, supercharging device 38, water injection well 39
In reservoir 3, and natural gas and stratum water are collected from producing well 2；The chemical agent composition is 5% mass than methanol, 5% mass ratio
Than DTAC, remaining components are source water for ethanol, 3% mass.
Claims (8)
- A kind of 1. method of row's formula horizontal well chemical flooding exploitation of gas hydrate, it is characterised in that methods described includes following Step：Step 1, arrangement row's formula horizontal-well network, with reference to geologic information, arrangement row's formula horizontal-well network is stored to target, horizontal well is divided into Water injection well and producing well, gas hydrates reserves can be employed to improve by arranging formula level distribution well；Step 2, completion practice, row's formula horizontal-well network arrangement carry out supporting completion practice after completing；Step 3, decompression exploitation, after supporting completion practice, the supporting ground system of located production wells, implement to water injection well and producing well Decompression exploitation, until without economic benefit；Step 4, arrangement flood pattern, flood pattern include ground supply system and downhole injection system；Gas hydrates are stored segmentation injection chemical agent and driven water-replacing by water injection well by step 5, displacement exploitation, and from life Produce well and collect natural gas and stratum water.
- A kind of 2. method of row's formula horizontal well chemical flooding exploitation of gas hydrate as claimed in claim 1, it is characterised in that institute It can be in the same direction or reverse that water injection well horizontal segment bearing of trend, which is stated, with the producing well horizontal segment bearing of trend； The water injection well horizontal segment depth and the producing well horizontal segment depth can be contour, and the water injection well horizontal segment can also Above or below the producing well horizontal segment.
- A kind of 3. method of row's formula horizontal well chemical flooding exploitation of gas hydrate 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.
- A kind of 4. method of row's formula horizontal well chemical flooding exploitation of gas hydrate as claimed in claim 1, it is characterised in that institute It is the tripping in electric submersible pump in water 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.
- A kind of 5. method of row's formula horizontal well chemical flooding exploitation of gas hydrate 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.
- A kind of 6. method of row's formula horizontal well chemical flooding exploitation of gas hydrate as claimed in claim 1, it is characterised in that institute Stating ground supply system includes water system and control system, and the water system includes water treatment facilities, agitating device, chemistry Agent storage tank, control valve, water storage device, metering device, supercharging device, fluid flowmeter, temperature sensor, pressure sensor； The control system includes controller and signal receiver.
- A kind of 7. method of row's formula horizontal well chemical flooding exploitation of gas hydrate as claimed in claim 1, it is characterised in that institute Stating downhole injection system includes insulated tubing, centralizer, packer and horn mouth.
- A kind of 8. method of row's formula horizontal well chemical flooding exploitation of gas hydrate as claimed in claim 1, it is characterised in that institute It is to inject 0.1 times of pore volume driven water-replacing in being stored to gas hydrates to state displacement stages of mining, is subsequently injected into 0.1 times of hole Volume chemical agent, then implement driven water-replacing and chemical agent and alternately injected with 0.1 times of pore volume, and natural gas is collected from producing well And stratum water；The driven water-replacing is conventional source water water；The chemical agent composition be 5% mass than methanol, 5% mass than ethanol, For 3% mass than DTAC, remaining components are source water.
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Application publication date: 20180112 |