CN110344801A - Fracturing work method, recovery method and mining system for combustible ice exploitation - Google Patents
Fracturing work method, recovery method and mining system for combustible ice exploitation Download PDFInfo
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- CN110344801A CN110344801A CN201810285333.1A CN201810285333A CN110344801A CN 110344801 A CN110344801 A CN 110344801A CN 201810285333 A CN201810285333 A CN 201810285333A CN 110344801 A CN110344801 A CN 110344801A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005065 mining Methods 0.000 title claims description 7
- 238000011084 recovery Methods 0.000 title description 10
- 238000000605 extraction Methods 0.000 claims abstract description 61
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003345 natural gas Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 239000007924 injection Substances 0.000 claims description 54
- 238000002347 injection Methods 0.000 claims description 54
- 230000015572 biosynthetic process Effects 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000006837 decompression Effects 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses the fracturing work methods applied in individual well and twin-well, the corresponding method to extract natural gas; and system and device when exploitation; fracturing work is carried out with pressurization decompression pair wise; pass through the guidance of negative pressure gradient field; most fracturing fracture is set to eventually point to extraction branch well hole; destruction of the fracturing work to superstratum is significantly reduced, combustible ice upper caldding layer is protected, is one of the guarantee of combustible ice safe working；Individual well is greatly improved to the controlling range of combustible ice resource, well yield is improved, reduces cloth well density.It when exploitation, injects between branch well hole and extraction branch well hole to be also depressurized into using pressurization and works push-pull type, it is unimpeded to be conducive to keep being injected into extraction seepage channel, prevents secondary icings of fracturing fracture from filling, maintains combustible ice natural gas extraction steady in a long-term.
Description
Technical field
The present invention relates to energy extraction technologies, and in particular to a kind of application pressurization, which is depressurized into, presses stratum pressure field
Split operational method, and the method and system with fracturing work method exploitation combustible ice formation gas.
Background technique
Depressurizing (negative pressure) exploitation is exactly the pressure reduced in wellbore, in the temperature and pressure ring for locally breaking combustible ice preservation
Border makes flammable ice-out.This recovery process will consider Multiple factors.With the thawing of combustible ice, gas, local pressure are formed
It will increase；Flammable ice-out heat absorption reduces local temperature；Local temperature and pressure environment can return to the temperature pressure of icing quickly
Power condition and range, causes recovery process to stop.To keep combustible ice exploitation more lasting, fracturing work becomes important means naturally,
However, but there is following two in fracturing work method used in combustible ice exploitation:
First, meeting the spatial dimension of flammable ice-out pressure condition very since pressure is just restored in radial very short distance
It is small, it is analyzed by taking uniformly infinite thick stratum as an example, melting region is the radial cylindrical space range from the borehole wall to tens centimetres.Such as
Fruit is perforation tunnel also as the extension of wellbore, then the Control Radius of a well is also only about equal to perforation radius and adds tens centimetres
?.
Second, fracturing work becomes the effective means for expanding individual well limit of mining, after fracturing work, the control of a well
Radius is approximately more than the range that pressure-break is covered.But since combustible ice superstratum is thin and soft, to cover ground on protection combustible ice
Layer damage, high-strength pressure crack operation as shale gas exploitation not can be used.Further, since the secondary icing of combustible ice,
Crack caused by fracturing work is filled quickly, and the effect for generating fracturing work is from continuing to retain.
Summary of the invention
To solve the above-mentioned problems, it is depressurized into the present invention provides a kind of application pressurization and pressure break is carried out to stratum to pressure field
The method of operation, and the method and system with fracturing work method exploitation combustible ice formation gas.
The fracturing work method applied in individual well, comprising the following steps:
1) at least one extraction branch well hole is bored in the extraction layer position on stratum, bores at least one injection Multilateral Wells in implanted layer position
Eye；Several perforation roads are offered so that fracturing fluid flows into or flows in the pipeline of the extraction branch well hole and injection branch well hole
Out；
2) after completing casing job, well cementing operation, perforating job and installation inlet device etc., by pressurization pipeline and pressure break
The plug of packing is transferred to extraction branch well hole along casing and is injected in the casing between branch well hole；
3) pressure inlet passes through the plug on path and is connected to injection branch well hole；Pressure inlet is connected with booster pump, to make
Booster pump is connected to injection branch well hole；Annular space between the pressure inlet and casing is relief passage；The one of relief pipe
End connection drawdown pump, the other end are connected to extraction branch well hole through relief passage；
4) start booster pump and drawdown pump, carry out fracturing work: booster pump injects pressure break by injection branch well hole, to stratum
Liquid forms normal pressure gradient fields in injection branch well hole surrounding formation；Drawdown pump passes through relief passage from extraction branch well hole
Middle proposition liquid forms negative pressure gradient field in extraction branch well hole surrounding formation；In injection branch well hole to extraction branch
On path between wellbore, positive and negative pressure gradient fields mutually recommend reinforcement, generate larger fracturing fracture；In other stratigraphic regions
Domain, positive and negative pressure gradient fields are mutually cut down, and are generated smaller fracturing fracture or are not generated fracturing fracture.
Using the method for above-mentioned fracturing work method exploitation combustible ice formation gas:, will be described after the completion of fracturing work
Pressure inlet changes warm water tube into, the relief pipe is changed into gas-water channel, and the warm water tube connects warm water regulator control system, the air water
Channel connection separation lifting system；
The warm water regulator control system is through warm water tube, the conveying injection liquid into injection branch well hole, and injection liquid is through large fracture to extraction
Well seepage flow, combustible ice melting liquid is flowed under pressure differential in extraction branch well hole in stratum, and natural gas is flow to through gas-water channel
It separates in lifting system.
The fracturing work method applied in Liang Koujing, comprising the following steps:
1) the two mouthfuls of wells in left and right are drilled out, left side well is for producing, and the right well is for injecting；
At least one extraction branch well hole is bored in the well of the left side, at least one injection branch well hole, the extraction point are bored in the well of the right
Several perforation roads are offered so that fracturing fluid flows into or from the pipeline of branch wellbore and injection branch well hole；
2) casing job, well cementing operation, perforating job and installation inlet device operation are completed；
3) installed plug is distinguished in well, in the extraction well on the left side, the output end of relief pipe sequentially passes through the plug on path
Connection extraction branch well hole afterwards；In well on the right, the output end of pressure inlet divides after sequentially passing through the plug on path with injection
The connection of branch wellbore；
4) start booster pump and drawdown pump, carry out fracturing work；Booster pump injects pressure break to stratum by injection branch well hole
Liquid forms normal pressure gradient fields in surrounding formation；Drawdown pump proposes liquid by producing branch well hole from relief passage,
Negative pressure gradient field is formed in surrounding formation；On injection branch well hole to the path of extraction branch well hole, positive and negative pressure force gradient
It mutually recommends reinforcement and generates larger fracturing fracture in field；In other subterranean formation zones, it is smaller that positive and negative pressure gradient fields mutually cut down generation
Fracturing fracture does not generate fracturing fracture.
Using the method for above-mentioned two mouthfuls of wells fracturing work method exploitation combustible ice natural gas: changing the pressure inlet into warm water
The relief pipe is changed into gas-water channel by pipe, and the upper end of the warm water tube connects warm water regulator control system, the gas-water channel it is upper
End connection separation lifting system；Warm water regulator control system conveying injection liquid into injection branch well hole through warm water tube, injects liquid
Through large fracture to well seepage flow is produced, combustible ice melting liquid is flowed under pressure differential in extraction branch well hole in stratum, natural gas
It is flow in separation lifting system through gas-water channel.
Using the mining system of above-mentioned fracturing work method exploitation combustible ice natural gas, which is applied in straight well,
Including casing, warm water regulator control system and separation lifting system, warm water tube and underground regulation device, the temperature are equipped in described sleeve pipe
The upper end connection warm water regulator control system of water pipe, lower end connect underground regulation device；Space shape between described sleeve pipe and warm water tube
At gas-water channel, the gas-water channel connection separation lifting system；
Stratum at the extraction branch well hole is combustible ice reservoir, and the stratum at the injection branch well hole is hole reservoir；
It is respectively arranged with sand control screen in casing at combustible ice reservoir and at hole reservoir, up and down the two of each sand control screen
End is mounted on packing device, and sand control screen on be provided with several through-holes for fluid flow；The underground regulation dress
Install the casing at hole reservoir.
Beneficial effects of the present invention:
(1) fracturing work is carried out with pressurization decompression pair wise, by the guidance of negative pressure gradient field, makes most fracturing fracture most
It is directed toward extraction branch well hole eventually, significantly reduces destruction of the fracturing work to superstratum, protects combustible ice upper caldding layer, being can
Fire one of the guarantee of ice safe working；
(2) fracturing work is carried out by pressurization decompression pair wise, greatly improves individual well to the controlling model of combustible ice resource
It encloses, improves well yield, reduce cloth well density；
(3) it when exploiting, is also depressurized into using pressurization between injection branch well hole and extraction branch well hole and is worked push-pull type, be conducive to
It is unimpeded that holding is injected into extraction seepage channel, prevents secondary icings of fracturing fracture from filling, and maintains combustible ice steady in a long-term natural
Gas exploitation.
(4) when stopping Recovery, the secondary fracturing operation along old crack can also be carried out, reduce secondary fracturing operation at
This.
(5) such as serious because subtracting under obstruction output capacity in recovery process, it can be by injection branch well hole and extraction branch well hole
It exchanges, i.e., original annotation is entered branch well hole as extraction branch well hole, original extraction branch well hole is treated as injection branch well hole, it is positive and negative
Push-pull type pressurization, causes fluid reverse flow in the earth formation, achievees the effect that remove obstruction.
Detailed description of the invention
Fig. 1 is the temperature and pressure condition and range figure (professional domain common sense) that combustible ice is formed and saved；
Fig. 2 is down-hole pressure radial variations estimation result figure；
Fig. 3 is down-hole pressure gradient radial variations estimation result figure；
Fig. 4 is that pressurization is depressurized into fracturing work method schematic diagram；
Fig. 5 is that pressurization is depressurized into fracturing work effect diagram；
Fig. 6 is the system schematic being depressurized into using pressurization to fracturing work exploitation combustible ice formation gas；
Fig. 7 is to be depressurized into the system structure signal that combustible ice formation gas is exploited to fracturing work using pressurization in straight well
Figure；
Fig. 8 is to implement pressurization between Liang Koujing to be depressurized into fracturing work method schematic diagram；
Fig. 9 is to implement to be pressurized the fracturing effect schematic diagram being depressurized into fracturing work method between Liang Koujing.
In figure: 11 be booster pump, 12 be drawdown pump, 13 be pressure inlet, 14 be negative tube, 15 be casing, 16 be extraction Multilateral Wells
Eye, 17 be injection branch well hole, 18 be perforation road, 19 be plug, 21 be warm water regulator control system, 22 be separate lifting system, 23
For warm water tube, 24 be gas-water channel, 25 be sand control screen, 26 be packing device, 27 be underground regulation device,
3 it is casing, 4 be combustible ice reservoir, 5 be hole reservoir, 6 is hot water layer.
Specific embodiment
The present invention is further explained with reference to the accompanying drawing.
Fig. 1 gives the temperature and pressure condition that combustible ice is formed and saved.Negative pressure exploitation is exactly the pressure reduced in wellbore
Power makes flammable ice-out in the temperature and pressure environment for locally breaking combustible ice preservation.This recovery process to consider it is multiple because
Element.As the thawing of combustible ice forms methane gas, pressure be will increase, and flammable ice-out heat absorption reduces local temperature, part
Temperature and pressure environment can return to ice field quickly；So need constantly to be promoted wellbore fluid to keep Negative Pressure Difference environment,
Thermal energy and substance are supplemented simultaneously.Under the action of Negative Pressure Difference, after differential pressure gradients are greater than rupture pressure difference critical value, stratum is broken on stratum
It splits.It shakes out and ruptures under collective effect, stratum can partial collapse.Negative Pressure Difference control area size directly determines individual well quantum of output,
It directly determines well spacing density, directly decides whether to utilize horizontal well etc..
After applying a Negative Pressure Difference to stratum, the reaction on stratum is identical as fracturing process.Only conventional pressure break is positive pressure
Difference.Infinite thick stratum, in the case that fluid transmits pressure in ignoring hole and crack, pressure point are passed through for wellbore
Cloth is a radial one-dimensional problem, radial radiusrThe pressure of pointIt can be write as roughly:
(I)
Wherein,It is undisturbed formation pressure, for several hundred meters of unconsolidated formation under sea bed face,It is approximately equal to sea herein
Hydrostatic pressure；It is borehole pressure；It is wellbore radius.
Fig. 2 is pressure radial variations facile synthesis result.Wherein, undisturbed formation pressure is that 10Mpa (is equivalent at the 1000m depth of water
Pressure), borehole pressure 6MPa (is equivalent to the pressure at the 600m depth of water), and wellbore radius is 0.1m, and used model is
It is radial one-dimensional.Solid line shown in figure is according to formula (I) pressure radial variations calculated.When considering pore channel and crack
After the pressure transmitting effect of middle fluid, as shown in dashed line in figure 2, the complicated many of calculation formula, and with a number of other stratum
Relating to parameters.As can be seen from Fig., since the radial direction of pressure is restored, the range that pressure meets flammable ice-out pressure condition is not
It is very big, it is analyzed by taking Fig. 2 as an example, if critical pressure is 9MPa, melting region is the radial extension from the borehole wall to 25cm.If
Perforation tunnel is also as the extension of wellbore, then the Control Radius of a well is approximately equal to perforation radius and adds 25cm.If again pressure break
Seam is also taken into account, then the Control Radius of a well is approximately equal to the range that pressure-break is covered.But due to combustible ice superstratum
It is thin and soft, massive hydraulic fracture as shale gas exploitation not can be used.Further, since the secondary icing of combustible ice, pressure break institute
The crack of generation is filled quickly.
In stratum in the decompression recovery process of combustible ice, under the action of Negative Pressure Difference, stratum may rupture.In stratum
Barometric gradient can be simulated and be calculated, and pass through infinite thick stratum for wellbore, ignore fluid transmitting pressure in hole and crack
In the case of, pressure distribution is a radial one-dimensional problem, radial radiusrThe barometric gradient of point can be write as roughly:
.(II)
Fig. 3 is barometric gradient radial variations facile synthesis result.In figure, undisturbed formation pressure is that 10Mpa (is equivalent to 1000m water
The pressure of depths), borehole pressure 6MPa (is equivalent to the pressure at the 600m depth of water), and wellbore radius is 0.1m, used mould
Type is radial one-dimensional.Solid line in Fig. 3 is calculated according to formula (II) when considering hole and crack, and barometric gradient is such as empty
Shown in line.If barometric gradient is greater than the cracking threshold on stratum, stratum will rupture, and generate crack.Stratum generally has out
Sand critical pressure gradient and crack critical pressure gradient, controlling the barometric gradient in stratum is the control of combustible ice recovery process
One of important content.By injecting liquid toward stratum, substance in debt is supplemented, pressure difference control may be implemented.
Embodiment 1
The present invention is best with horizontal branch well effect.Fracturing process as shown in Figures 4 and 5, fracturing step are as follows:
1) in the position of combustible ice reservoir 4, horizontal drilling goes out branch well hole 16,5 water of hole reservoir below combustible ice reservoir 4
Flat drill injects branch well hole 17；Several perforations are offered in the pipeline of the extraction branch well hole 16 and injection branch well hole 17
Road 18 is to appear pressure；
2) casing 3 is placed in well, carries out well cementation, perforation and installation inlet device；
3) plug 19 and pressure inlet 13 are transferred along casing 3, the pressure inlet 13 sequentially pass through after the plug 19 on path with
Branch well hole 17 is injected to be connected to；Pressure inlet 13 connects booster pump 11；
Annular space between pressure inlet 13 and casing 3 is the channel of negative pressure；One end of negative tube 14 connects drawdown pump, the other end
Negative pressure channel is connected, to be connected to extraction branch well hole 16；
4) start booster pump 11 and drawdown pump 12.In conjunction with Fig. 5, positive/negative pressure is to fracturing effect schematic diagram: extraction branch well hole 16
It is connected to drawdown pump 12, injection branch well hole 17 is connected to booster pump 11；In injection branch well hole 16 to the ground of extraction branch well hole 17
In layer, reinforcement is mutually recommended in the positive/negative-pressure field of force, generates larger fracturing fracture；In other regions, the positive/negative-pressure field of force is mutually cut down, and is produced
Raw smaller fracturing fracture does not generate fracturing fracture even.Since normal pressure amplitude is generally larger than negative pressure amplitude, in injection point
The crack of 17 lower section of branch wellbore is that medium, 16 top of extraction branch well hole crack is smaller.
So far, occur corresponding large fracture, middle crack and small crack after above-mentioned fracturing work, in stratum, it is described to split greatly
Seam appears in extraction branch well hole 16 and injects in the stratum between branch well hole 17, and the middle crack appears in injection Multilateral Wells
In the stratum of 17 lower section of eye, the small crack is appeared in the stratum of 16 top of extraction branch well hole.
Fig. 6 is positive/negative pressure to mining system schematic diagram after pressure break: the forward voltage diode 13 in fracturing work is changed into warm water
Pipe 23, negative tube 14, which are changed, produces the connection separation lifting system 22 of branch well hole 16 at gas-water channel 24, injects branch well hole 17
It is connected to warm water regulator control system 21 and realizes warm water sucking, heating, pressurization.It injects liquid and is seeped by large fracture to extraction branch well hole 16
Thermal energy, activator are passed to combustible ice reservoir 4 by stream, while warm water injection liquid can supplement formation material deficit.
Fig. 7 is depressurized into using pressurization to fracturing work method, and the system of combustible ice formation gas is exploited in straight well
Structural schematic diagram: sand control screen 25, each sand control are respectively arranged in the casing 3 at combustible ice reservoir 4 and at hole reservoir 5
The upper and lower ends of screen casing 25 are mounted on packing device 26, and sand control screen 25 on be provided with it is several for fluid flow logical
Hole.Underground regulation device 27 is installed, underground regulation device 27 adjusts warm water liquid and is injected into the casing 3 at hole reservoir 5
Speed and injection rate in hole reservoir 5.When deep formation hot water can use, deep formation hot water flows into from below simultaneously
In hole reservoir 5.
Embodiment 2
Fracturing process as shown in Figure 8 is implemented in more wells, by taking two mouthfuls of wells as an example.Implement between Liang Koujing, fracturing step
Are as follows:
1) the two mouthfuls of wells in left and right are drilled out, wherein the well on the left side is beaten to the extraction position of combustible ice reservoir 4, and the well on right side gets to hole storage
The injection phase of layer 5.
Horizontal extraction branch well hole 16 is bored in the position of combustible ice reservoir 4, the hole reservoir 5 below combustible ice reservoir 4
Bore horizontal injection branch well hole 17；Several penetrate is offered in the pipeline of the extraction branch well hole 16 and injection branch well hole 17
Duct 18 is to appear pressure；
2) it places casing 3 respectively in the two mouthfuls of wells in left and right, carry out well cementation, perforation and installation inlet device；
3) installed plug 19 is distinguished in the two mouthfuls of wells in left and right, as shown in Figure 8, in the well on the left side, the output end of negative tube 14
Connection produces branch well hole 16 after sequentially passing through the plug 19 on path；On the right in well, the output end of pressure inlet 13 is successively worn
Branch well hole 17 is injected in connection after crossing the plug 19 on path；
4) start booster pump 11 and drawdown pump 12.It produces branch well hole 16 and is connected to drawdown pump 12, the injection connection of branch well hole 17 increases
Press pump 11；In injection branch well hole 16 into the stratum of extraction branch well hole 17, reinforcements mutually is recommended in the positive/negative-pressure field of force, generation compared with
Big fracturing fracture；In other regions, the positive/negative-pressure field of force is mutually cut down, and is generated smaller fracturing fracture and is not generated fracturing fracture even.
Since normal pressure amplitude is generally larger than negative pressure amplitude, the fracturing fracture below injection branch well hole 17 is medium, extraction
The crack of 16 top of branch well hole is smaller.
Fig. 9 is that positive/negative pressure applies pressure break recovery method in Liang Koujing: the forward voltage diode 13 in fracturing work is changed into temperature
Water pipe 23, negative tube 14 are changed into gas-water channel 24.It produces branch well hole 16 and is connected to separation lifting system 22 through gas-water channel 24,
It injects branch well hole 17 and is connected to warm water regulator control system 21 through warm water tube 23.Warm water inject liquid through excessive fracturing fracture to extraction branch
Thermal energy, activator are passed to combustible ice reservoir 4 by 16 seepage flow of wellbore, while warm water injection liquid can supplement formation material deficit.
Claims (5)
1. a kind of fracturing work method, which comprises the following steps:
1) at least one extraction branch well hole is bored in the extraction layer position on stratum, bores at least one injection Multilateral Wells in implanted layer position
Eye；Several perforation roads are offered so that fracturing fluid flows into or flows in the pipeline of the extraction branch well hole and injection branch well hole
Out；
2) after completing casing job, well cementing operation, perforating job and installation inlet device etc., by pressurization pipeline and pressure break
The plug of packing is transferred to extraction branch well hole along casing and is injected in the casing between branch well hole；
3) pressure inlet passes through plug, is connected to injection branch well hole；Pressure inlet is connected with booster pump, thus make booster pump with
Inject branch well hole connection；Annular space between the pressure inlet and casing is relief passage；One end connection of relief pipe subtracts
Press pump, the other end are connected to extraction branch well hole through relief passage；
4) start booster pump and drawdown pump, carry out fracturing work: booster pump injects pressure break by injection branch well hole, to stratum
Liquid forms normal pressure gradient fields in injection branch well hole surrounding formation；Drawdown pump passes through relief passage from extraction branch well hole
Middle proposition liquid forms negative pressure gradient field in extraction branch well hole surrounding formation；In injection branch well hole to extraction branch
On path between wellbore, positive and negative pressure gradient fields mutually recommend reinforcement, generate larger fracturing fracture；In other stratigraphic regions
Domain, positive and negative pressure gradient fields are mutually cut down, and are generated smaller fracturing fracture or are not generated fracturing fracture.
2. a kind of fracturing work method, which comprises the following steps:
1) the two mouthfuls of wells in left and right are drilled out, left side well is for producing, and the right well is for injecting；
At least one extraction branch well hole is bored in the well of the left side, at least one injection branch well hole, the extraction point are bored in the well of the right
Several perforation roads are offered so that fracturing fluid flows into or from the pipeline of branch wellbore and injection branch well hole；
2) casing job, well cementing operation, perforating job and installation inlet device operation are completed；
3) installed plug is distinguished in well, in the extraction well on the left side, the output end of relief pipe sequentially passes through the plug on path
Connection extraction branch well hole afterwards；In well on the right, the output end of pressure inlet divides after sequentially passing through the plug on path with injection
The connection of branch wellbore；
4) start booster pump and drawdown pump, carry out fracturing work；Booster pump injects pressure break to stratum by injection branch well hole
Liquid forms normal pressure gradient fields in surrounding formation；Drawdown pump proposes liquid by producing branch well hole from relief passage,
Negative pressure gradient field is formed in surrounding formation；On injection branch well hole to the path of extraction branch well hole, positive and negative pressure force gradient
It mutually recommends reinforcement and generates larger fracturing fracture in field；In other subterranean formation zones, it is smaller that positive and negative pressure gradient fields mutually cut down generation
Fracturing fracture does not generate fracturing fracture.
3. a kind of method using the exploitation combustible ice formation gas of fracturing work method described in claim 1, it is characterised in that:
After the completion of fracturing work, the pressure inlet is changed into warm water tube, the relief pipe is changed into gas-water channel, the warm water tube connection
Warm water regulator control system, the gas-water channel connection separation lifting system；
The warm water regulator control system is through warm water tube, the conveying injection liquid into injection branch well hole, and injection liquid is through large fracture to extraction
Well seepage flow, combustible ice melting liquid is flowed under pressure differential in extraction branch well hole in stratum, and natural gas is flow to through gas-water channel
It separates in lifting system.
4. a kind of method using the exploitation combustible ice natural gas of fracturing work method described in claim 2, it is characterised in that:
It changes the pressure inlet into warm water tube, the relief pipe is changed into gas-water channel, the upper end of the warm water tube connects warm water
Regulator control system, the upper end connection separation lifting system of the gas-water channel；
The warm water regulator control system through warm water tube to injection branch well hole in conveying injection liquid, injection liquid through large fracture to extraction well
Seepage flow, combustible ice melting liquid is flowed under pressure differential in extraction branch well hole in stratum, and natural gas is flow to point through gas-water channel
From in lifting system.
5. a kind of mining system using the exploitation combustible ice natural gas of fracturing work method described in claim 1, feature exist
In: the mining system is applied in straight well, including casing, warm water regulator control system and separation lifting system, is equipped in described sleeve pipe
Warm water tube and underground regulation device, the upper end connection warm water regulator control system of the warm water tube, lower end connect underground regulation device；Institute
It states the space between casing and warm water tube and forms gas-water channel, the gas-water channel connection separation lifting system；
Stratum at the extraction branch well hole is combustible ice reservoir, and the stratum at the injection branch well hole is hole reservoir；
It is respectively arranged with sand control screen in casing at combustible ice reservoir and at hole reservoir, up and down the two of each sand control screen
End is mounted on packing device, and sand control screen on be provided with several through-holes for fluid flow；The underground regulation dress
Install the casing at hole reservoir.
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