CN105986801A - Method and device for explosive fracturing of sidetracking well - Google Patents
Method and device for explosive fracturing of sidetracking well Download PDFInfo
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- CN105986801A CN105986801A CN201510066833.2A CN201510066833A CN105986801A CN 105986801 A CN105986801 A CN 105986801A CN 201510066833 A CN201510066833 A CN 201510066833A CN 105986801 A CN105986801 A CN 105986801A
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Abstract
The invention relates to a method and a device for explosive fracturing of a sidetracking well. The method for explosive fracturing of the sidetracking well comprises the following steps: 1) putting a tubular column into a wellhole and inserting the lower end of the tubular column into a storage layer; 2) utilizing a packer arranged between the wellhole and the tubular column to pack the storage layer; 3) pumping a liquid explosive through the tubular column and feeding the liquid explosive into the sidetracking well; 4) pressing the liquid explosive in the tubular column to an upper interface of the storage layer; 5) putting an exploder through the tubular column and timing to explode. According to the method provided by the invention, the permeability of the storage layer is increased, the valid oil gas collecting radius and effusion area of the sidetracking well are increased and the purpose of increasing the yield of the oil gas well is achieved.
Description
Technical field
The invention belongs to the unconventionaloil pool such as shale oil gas, tight sand oil gas and hide stimulation technology field, especially
It relates to the method and apparatus of sidetracked hole explosive fracturing.
Background technology
Conventional gas and oil resource is through century-old exploration and development, and large-scale simple high-quality resource is fewer and feweri.With world's warp
Developing rapidly of Ji, increases day by day to the demand of the energy, and the reserves that unconventional petroleum resources progressively becomes new increase
Long point.
In prior art, horizontal well is used mostly to unconventional petroleum resources exploitations such as tight sand, shale oil gas
Staged fracturing technology.But, owing to the permeability of the reservoir of unconventional petroleum resources is low so that away from major fracture
Oil gas still difficult extraction, individual well improves production capacity and is restricted.Thus, utilize existing development technique to meet
The needs of newly-increased petrol resources exploitation situation.
Therefore, the production efficiency improving unconventional petroleum resources becomes a kind of urgent demand.
Content of the invention
For above-mentioned technical problem present in prior art, the present invention proposes for sidetracked hole explosive fracturing
Method and apparatus.This method for sidetracked hole explosive fracturing, can be effectively improved the permeability on stratum, expands
Effective oil recovery area and drainage area, reached to improve the purpose of oil well output.
According to the first aspect of the invention, it is proposed that a kind of method for sidetracked hole explosive fracturing, comprising:
Step one: be lowered into tubing string in pit shaft, makes the lower end of tubing string extend in reservoir,
Step 2: utilize the packer packing being arranged between pit shaft and tubing string every reservoir,
Step 3: pump liquid explosives by tubing string, in making liquid explosives approaching side drilling well,
Step 4: the upper interface of the liquid explosives in pressure gear tubing string to reservoir,
Step 5: by entering initiator under tubing string, and timed detonation.
In one embodiment, before step 2, insulating liquid circulation well cleanup is utilized, to empty tubing string and pit shaft
Reservoir in water and air.
In one embodiment, insulating liquid is the mixture of diesel oil, carbon tetrachloride and calcium chloride or diesel oil and tetrachloro
Change the one in the mixture of carbon.
In one embodiment, in step 3, the pressure of pumping liquid explosives is more than the hole on stratum residing for pit shaft
Gap pressure.
In one embodiment, in step 3, pumping liquid explosives volume not less than tubing string, sidetracked hole with
Packer packing every reservoir at the volume sum of pit shaft.
In one embodiment, in step 4, pressure gear liquid is used to carry out pressure gear to liquid explosives, and at pressure gear
Arrange between liquid and liquid explosives and intercept liquid.
In one embodiment, the density less than liquid explosives for the density of liquid is intercepted, and more than the density of pressure gear liquid,
And/or pressure gear liquid is water,
And/or it is identical with insulating liquid component to intercept liquid.
According to a further aspect in the invention, a kind of device for sidetracked hole explosive fracturing is improved, including can stretch into
Tubing string in reservoir, the packer being arranged between tubing string and pit shaft, the liquid that selectively can connect with tubing string
Body blasting explosive container, the insulating liquid container that selectively can connect with tubing string, the pressure gear liquid that can selective with tubing string connect
Container, and the pressurizer of liquid explosives, insulating liquid and pressure gear liquid pressurization can be.
In one embodiment, pressurizer is compressor.
In one embodiment, the porch at tubing string is provided for the flow that metering flows into the amount of liquid of tubing string
Meter.
Compared with prior art, it is an advantage of the current invention that the method utilizing for sidetracked hole explosive fracturing, make
The quasi-static propagation effect of the dynamic expansion effect and detonation gas that obtain Explosive stress wave is applied to sidetrack wellbore week
Enclose, to produce substantial amounts of radial fissure.Thus, form intensive fracture network system in the earth formation, and link up more
Many intrinsic fractures.Meanwhile, crack obtains permanent support because of the shearing collapse dislocation of seam face, forms reservoir fully
Transformation effect, improve the permeability of low-permeability reservoir, expand Oil/gas Well effective christmas radius and cascading water face
Long-pending, reach to improve the purpose of Oil/gas Well yield.Further, the method for sidetracked hole explosive fracturing of the present invention,
Explosion technology is simple, be easily achieved, safe and reliable.In addition, the device knot of the sidetracked hole explosive fracturing of the present invention
Structure is simple, be readily produced.
Brief description
Hereinafter based on embodiment and with reference to accompanying drawing, the present invention will be described in more detail.Wherein:
Fig. 1 shows the device for sidetracked hole explosive fracturing according to the present invention.
Accompanying drawing is not drawn according to actual ratio.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
Fig. 1 show in more detail the structure chart of the device for sidetracked hole explosive fracturing.As it is shown in figure 1, device
100 include that the 4th, tubing string the 1st, packer the 2nd, liquid explosives container the 3rd, insulating liquid container presses gear liquid container the 5th, to add
Depressor 6 and initiator 7.Wherein, tubing string 1 can be lowered in pit shaft, and the lower end of tubing string 1 can extend into
In reservoir.Packer 2 can be arranged between tubing string 1 and pit shaft, for packing reservoir.And liquid explosives hold
The 4th, device the 3rd, insulating liquid container presses gear liquid container 5 all selectively can connect with tubing string 1, in tubing string 1
Carry corresponding liquid.Pressurizer 6 all can with liquid explosives container the 3rd, insulating liquid container the 4th, press gear liquid container 5
Connection, thinks liquid explosives, insulating liquid and the pressure gear liquid pressurization entering tubing string 1.Initiator 7 can pass through tubing string
1 is fed in reservoir, and the liquid explosives in time fire reservoir.
In sidetracked hole explosive fracturing work progress, first, being lowered into tubing string 1 in pit shaft, its lower end is stretched into
After in reservoir, under enter packer 2.And make packer 2 act between pit shaft and the annular space of tubing string 1.Connect
, make insulating liquid container 4 connect with tubing string 1, utilize pressurizer 6 to pump insulating liquid in tubing string 1 simultaneously,
With the water and air in emptying tubing string 1 and packer 2 bottom.Then, packer 2 is made to set, to insulate storage
Layer.Again, utilize pressurizer 6 to pump liquid explosives in tubing string, and guarantee liquid explosives approaching side drilling well,
Meanwhile, by the original fluid press-in stratum in sidetracked hole.Secondary again, utilize pressure gear liquid to the liquid in tubing string 1
Explosive carries out pressure gear, by the upper interface of liquid explosives pressure gear to reservoir.Finally, initiator 7 is lowered into storage
In layer, and timed detonation.
Thus, by device 100 can at the reservoir of pit shaft ignition charge, and energy is outside along sidetracked hole
Transmission, ignites the explosive of reservoir depths, and blast causes the dynamic expansion effect of ripple to make to produce around pit shaft and sidetracked hole
Raw substantial amounts of crack, has linked up more intrinsic fracture.Thus, the infiltration of reservoir can be improved by device 100
Rate, expands effectively exploitation oil gas radius and drainage area, improves the production efficiency of petroleum resources.
In order to ensure construction safety, in a preferred embodiment, pressurizer 6 can be compressor, for example,
Air compressor.Pass through this set, it is to avoid pressurizer 6 directly contacts with liquid explosives, thus reduces
Ignite the risk of liquid explosives in advance, ensure construction safety.
It should be noted that for the power improving safety in utilization and blast, liquid explosives can be mixing
Explosive, thus avoid simple substance liquid explosives combination property difference, the shortcoming that stability is not enough, brisance is weak.
Furthermore, it is possible to field fabrication liquid explosives according to demand.For example, liquid explosives can be job site configuration
Including the mixing liquid explosives of nitromethane and ethylenediamine.
It should be noted that insulating liquid can be the mixture of diesel oil, carbon tetrachloride and calcium chloride, and three
Volume ratio be 1:1:1.But the present invention is not limited to this insulating liquid, can also can rise for other components
The liquid of phase same-action.For example, insulating liquid can be the mixture of diesel oil and carbon tetrachloride, and both bodies
Long-pending ratio is 1:2.
For ensureing safety, prevent contingency from occurring, need the liquid explosives ignited to exist only in reservoir portion,
Thus, it is desirable to utilize pressure shelves liquid to carry out pressure gear to liquid explosives.And press gear liquid can be water.But in order to prevent
Water diluent body explosive, needs to arrange between liquid explosives and water to intercept liquid.It is nitromethane at liquid explosives
In the case of with the mixing liquid explosives of ethylenediamine, the density of this liquid explosives is about 1.25kg/cm3.And by
In its tool of insulating liquid that the insulating liquid being formed by diesel oil, carbon tetrachloride and calcium chloride or diesel oil and carbon tetrachloride are formed
Have the features such as water insoluble, nonflammable.Further, because the density of this insulating liquid is at 1.05～1.15kg/cm3Between,
Therefore this insulating liquid can be used to use as intercepting liquid.And this set form, it is not necessary to be reconfigured at special
Intercept liquid, thus simplify production technology, reduce running cost.
It should be noted that liquid explosives container the 3rd, insulating liquid container 4 and pressure gear liquid container 5 can be multiple
Container independent of each other, certainly can also be for being sequentially arranged with a container of different liquids according to needs.Certainly
Needing can also be two containers according to scene, for example, liquid explosives can be positioned in a container, and every
Chaotropic can utilize a container with pressure gear liquid, and the simply different needs according to site operation, according to the elder generation using
Rear order, deposits insulating liquid and pressure gear liquid in a reservoir successively.Therefore, in application, liquid explosives container is the 3rd,
Insulating liquid container 4 and pressure gear liquid container 5 are not limited to the concrete container shown in Fig. 1, but can root
According to site operation demand, optimize usage quantity and the order of container.
Specifically, compressor 6 can by pipeline 8 respectively with liquid explosives container the 3rd, insulating liquid container 4 and
Pressure gear liquid container 5 connects, and thinks liquid explosives, insulating liquid and pressure gear liquid pressurization.In order to make compressor 6 respectively
Selectively connect with liquid explosives container the 3rd, insulating liquid container 4 and pressure gear liquid container 5, then respectively at compressor
On 6 pipelines 8 connecting with liquid explosives container the 3rd, insulating liquid container 4 and pressure gear liquid container 5, valve 9 is set.With
Reason ground, tubing string 1 keeps off liquid container 5 with liquid explosives container the 3rd, insulating liquid container 4 and pressure respectively by pipeline 8
Connection, for carrying liquid in pit shaft and sidetracked hole.Further, tubing string 1 and liquid explosives container the 3rd, every
Between the pipeline 8 of chaotropic container 4 and pressure gear liquid container 5 connection, valve 9 is set, is used for realizing respective liquid and pipe
The connection of post 1 or cut-off.
Flowmeter 10 can also be set in the porch of tubing string 1, to detect the fluid flow entering in tubing string 1.
Furthermore it is also possible to connect with tubing string 1 with pressure gear liquid container 5 at each liquid explosives container the 3rd, insulating liquid container 4
Pipeline 8 on Pressure gauge 11 is set, detecting fluid pressure, thus instruct compressor 6 to work.
Describe the method for sidetracked hole explosive fracturing below according to Fig. 1 in detail.
First, it is lowered into tubing string 1 in pit shaft, make the lower end of tubing string 1 extend in reservoir.Tubing string 1 He
Packer 2 is set between pit shaft.Open the related valve 9 of insulating liquid container 4, make insulating liquid container 4 and pipe
Post 1 connects.Meanwhile, by related valves 9, liquid explosives container 3 and pressure gear liquid container 5 and tubing string 1 section are made
Only.Compressor 6 is utilized to pump insulating liquid in tubing string 1 with circulation well cleanup.Can be by calculating tubing string the 1st, reservoir
The pit shaft at place and the volume of sidetracked hole, and with reference to the numerical value of flowmeter 10, it is judged that whether the insulating liquid of injection is arranged
Empty tube column 1 and the water and air of wellbore packer 2 bottom.When the 1st, the isolation liquid measure of pumping stores up slightly larger than tubing string
The volume of the pit shaft at Ceng and sidetracked hole and when, then can conclude that emptying completes.
Then, close the related valve 9 of insulating liquid container 4, stop pumping insulating liquid in tubing string 1.Make envelope
Setting between tubing string 1 and pit shaft, to insulate reservoir every device 2.
Again, the valve 9 related to liquid explosives container 3 is opened, to connect liquid explosives container 3 and tubing string 1.
Compressor 6 is utilized to pump liquid explosives in tubing string 1.It should be noted that the pressure of pumping liquid explosives is wanted
More than the formation pore pressure residing for reservoir, the insulating liquid in reservoir is sent to stratum by liquid explosives
In.When flowmeter 10 display flow slightly larger than the pit shaft at tubing string the 1st, reservoir and sidetracked hole volume and when,
Judge all to be filled with liquid explosives in the reservoir and sidetracked hole of pit shaft.
Secondary again, the related valve 9 of closing liquid blasting explosive container 3, stop pumping liquid explosives in tubing string 1.
Open the valve 9 related to pressing gear liquid container 5, to connect pressure gear liquid container 5 and tubing string 1.Utilize compressor 6
Pumping pressure gear liquid in tubing string 1, makes the liquid level of the liquid explosives in tubing string 1 decline.Can be according to tubing string 1
Volume and the upper interface location of reservoir, calculate required pressure gear flow quantity, to keep off liquid explosives pressure at reservoir
Upper interface.If it should be noted that pressure gear liquid is water, for preventing liquid explosives to be diluted, in pumping pressure
Before gear liquid, first can pump insulating liquid in tubing string 1, to intercept water and liquid explosives.Certainly, insulating liquid
Density is between the density and the density of liquid explosives of water, and insulating liquid stable can be present in water and liquid explodes
Between medicine.For example, liquid explosives can be the mixture of nitromethane and ethylenediamine, and insulating liquid can be bavin
One in oil, carbon tetrachloride and calcium chloride mixture or diesel oil and carbon tetrachloride mixture.
Finally, it along tubing string 1, is lowered into initiator 7 at reservoir by rope, and timed detonation.Blast
Energy outwards propagate along sidetrack wellbore, ignite the liquid explosives of reservoir depths, the dynamic expansion of Explosive stress wave
The quasi-static propagation effect of abduction and detonation gas makes to produce around the pit shaft of pit shaft, sidetracked hole substantial amounts of radial direction
Crack, forms intensive fracture network system.More intrinsic fracture has been linked up in this crack, and crack is cut because of seam face
Cut dislocation of caving in and obtain permanent support, define sufficient transformation effect to reservoir.Meanwhile, Detonation Shock Wave and
Stress wave impulse oscillation effect effectively changes Rock Matrix space and connectedness around reservoir.These pressures of exploding
Cracking method improves the permeability on stratum, expands effective christmas radius and cascading water area, has reached to improve oil
The purpose of gas well yield.In addition, simple by this explosive fracturing method technique, security performance is high.
Although by reference to preferred embodiment, invention has been described, but without departing from the scope of the present invention
In the case of, various improvement can be carried out to it and parts therein can be replaced with equivalent.Especially, only
Otherwise there is structural hazard, the every technical characteristic being previously mentioned in each embodiment all can combine in any way
Come.The invention is not limited in specific embodiment disclosed herein, but include falling within the scope of the appended claims
All technical schemes.
Claims (10)
1. the method for sidetracked hole explosive fracturing, it is characterised in that include:
Step one: be lowered into tubing string in pit shaft, makes the lower end of described tubing string extend in reservoir,
Step 2: utilize the packer packing being arranged between pit shaft and described tubing string every reservoir,
Step 3: pump liquid explosives by described tubing string, in making liquid explosives approaching side drilling well,
Step 4: the upper interface of the liquid explosives in the described tubing string of pressure gear to reservoir,
Step 5: by entering initiator under tubing string, and timed detonation.
2. method according to claim 1, it is characterised in that before step 2, utilize insulating liquid
Circulation well cleanup, to empty the water and air in the reservoir of described tubing string and pit shaft.
3. method according to claim 2, it is characterised in that described insulating liquid is diesel oil, four chlorinations
One in the mixture of the mixture of carbon and calcium chloride or diesel oil and carbon tetrachloride.
4. method according to claim 1, it is characterised in that in step 3, pumps liquid explosives
Pressure more than the pore pressure on stratum residing for pit shaft.
5. method according to claim 4, it is characterised in that in step 3, pumps liquid explosives
Volume not less than described tubing string, sidetracked hole and packer packing every reservoir at the volume sum of pit shaft.
6. method according to claim 3, it is characterised in that in step 4, uses pressure gear liquid pair
Liquid explosives carry out pressure gear, and setting intercepts liquid between pressure gear liquid and liquid explosives.
7. method according to claim 6, it is characterised in that the density of described obstruct liquid is less than described
The density of liquid explosives, and more than the density of described pressure gear liquid,
And/or described pressure gear liquid be water,
And/or described obstruct liquid identical with described insulating liquid component.
8. the device for sidetracked hole explosive fracturing, it is characterised in that include extending in reservoir
Tubing string, the packer being arranged between tubing string and pit shaft, the liquid explosives that selectively can connect with described tubing string
Container, the insulating liquid container that selectively can connect with described tubing string, the pressure gear that can selective with described tubing string connect
Liquid container, initiator and the pressurizer that can pressurize for described liquid explosives, insulating liquid and pressure gear liquid.
9. device according to claim 8, it is characterised in that described pressurizer is compressor.
10. device according to claim 9, it is characterised in that arrange in the porch of described tubing string and use
Flow into the flowmeter of the amount of liquid of described tubing string in metering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066833.2A CN105986801A (en) | 2015-02-09 | 2015-02-09 | Method and device for explosive fracturing of sidetracking well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066833.2A CN105986801A (en) | 2015-02-09 | 2015-02-09 | Method and device for explosive fracturing of sidetracking well |
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| CN105986801A true CN105986801A (en) | 2016-10-05 |
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| CN201510066833.2A Pending CN105986801A (en) | 2015-02-09 | 2015-02-09 | Method and device for explosive fracturing of sidetracking well |
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Cited By (6)
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| CN106437666A (en) * | 2016-11-18 | 2017-02-22 | 西南石油大学 | Novel technology for igniting specific explosive for explosive fracturing in oil and gas reservoir |
| CN108252702A (en) * | 2018-02-06 | 2018-07-06 | 西安石油大学 | The oil and gas reservoir volume remodeling method of seam in a kind of seam |
| CN108756845A (en) * | 2018-05-03 | 2018-11-06 | 肖毅 | A kind of dilatation increment explosion fracturing method |
| CN110344806A (en) * | 2018-04-02 | 2019-10-18 | 中国石油化工股份有限公司 | A kind of slim-hole explosion seam auxiliary hydraulic fracturing method |
| CN111398026A (en) * | 2020-04-21 | 2020-07-10 | 北京探矿工程研究所 | Deep well surrounding rock high-temperature high-pressure blasting test device and test method |
| CN114278270A (en) * | 2020-09-27 | 2022-04-05 | 中国石油大学(北京) | Methane in-situ control combustion-explosion fracturing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108756845A (en) * | 2018-05-03 | 2018-11-06 | 肖毅 | A kind of dilatation increment explosion fracturing method |
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| CN114278270A (en) * | 2020-09-27 | 2022-04-05 | 中国石油大学(北京) | Methane in-situ control combustion-explosion fracturing method and device |
| CN114278270B (en) * | 2020-09-27 | 2023-09-26 | 中国石油大学(北京) | Methane in-situ control blasting fracturing method and device |
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