CN106285610A - Fracturing string - Google Patents
Fracturing string Download PDFInfo
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- CN106285610A CN106285610A CN201510236616.3A CN201510236616A CN106285610A CN 106285610 A CN106285610 A CN 106285610A CN 201510236616 A CN201510236616 A CN 201510236616A CN 106285610 A CN106285610 A CN 106285610A
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Abstract
The present invention relates to a kind of fracturing string, including: central canal, the fracturing equipment being connected with central canal, fracturing equipment is configured with the pressure break passage being connected with central canal, and the upstream packer that is connected with central canal and downstream packer, upstream packer is arranged on the upstream side of fracturing equipment, and downstream packer is arranged on the downstream of fracturing equipment, wherein, sealing space can be formed after upstream packer and downstream packer set in the external rings vacancy of fracturing equipment.Use this fracturing string can improve stratum production capacity, especially can be by it and old well is repeated transformation, further to improve the stratum production capacity of old well, reached the purpose of cost efficiency.
Description
Technical field
The present invention relates to stimulation technology field, particularly relate to a kind of fracturing string.
Background technology
In recent years, horizontal well multistage fracturing technique is used widely at home.By stratum is carried out perforation and
Pressure break produces the crack with certain circulation, makes the fine and close oil in stratum, tight gas effusion, and production capacity is higher.
In the prior art, in fracturing string, generally it is filled with pressure break agent carries out pressure break with fracture, make crack quilt
Pressure break agent is filled and cannot be closed.This fracturing string, pressure break agent is used to hardly enter in crack, it is easy to
Annular space flows thus loses.So pressure break agent is only capable of entering in shallower crack, and deeper crack
In cannot be filled by pressure break agent so that the crack of depths quickly can close in the case of not filling, lead
Cause the fine and close oil around the crack of depths and tight gas cannot collected go out, had a strong impact on stratum production capacity.
Accordingly, it would be desirable to a kind of fracturing string that can improve stratum production capacity.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of fracturing string, uses this fracturing string can improve ground
Layer production capacity.
The present invention proposes a kind of fracturing string, including: central canal, the fracturing equipment being connected with central canal, in pressure
Split and on device, be configured with the pressure break passage being connected with central canal, and the upstream packer that is connected with central canal and under
Trip packer, upstream packer is arranged on the upstream side of fracturing equipment, and downstream packer is arranged on the downstream of fracturing equipment
Side, wherein, can be formed in the external rings vacancy of fracturing equipment after upstream packer and downstream packer set and seal
Space.
The fracturing string of the present invention is lowered in stratum, the crack needing to carry out pressure break is sprayed by fracturing equipment
Penetrate pressure break agent, make crack be filled by pressure break agent and support.In fracturing process, in the upstream of fracturing equipment upstream
Packer and the downstream packer in fracturing equipment downstream all set, and seal sky it is thus possible to formed around fracturing equipment
Between, make pressure break agent can be maintained in this space.So it is passed through pressure break agent through central canal, and pressure break agent can be led to
Cross pressure break passage to be constantly ejected.In the process, seal the pressure in space and increase, thus pressure break can be caused
The pressure that agent is bigger in being closed space is pressed in crack, makes the crack of depths also can be filled by pressure break agent.This
Sample, is connected with between crack in can making well, and the tight gas around fracture and densification oil, even to deeply
Tight gas and densification oil around the crack at place are acquired, to improve stratum production capacity herein.
In one embodiment, fracturing equipment slidingtype is socketed in the circumferential side wall of central canal, is split by upper pressure-raising
Tubing string can make fracturing equipment slide so that pressure break passage intercepts mutually with central canal relative to central canal, by transferring pressure break
Tubing string can make fracturing equipment slide so that pressure break passage is connected with central canal relative to central canal.So, under enter
After fracturing string, central canal can be made to slide into the position of needs by the action raised and decentralized and realize center
The control of the connected state of pipe and pressure break passage.This structure make operating personnel can by simple action, and
Carry out fracturing process controlling more freely and accurately.
In one embodiment, downstream packer is mechanical type anchor packer, by put and put fracturing string
Downstream packer can be made to set.Use this packer can be lowered into expection at fracturing string as downstream packer
Pressure break position after, only by raising and decentralizing this shirtsleeve operation of tubing string, downstream packer can be realized
Setting, easy to operate, efficiency is high.Downstream packer after setting can be to fracturing string and production string (borehole wall)
Between annular space insulate, make pressure break agent during pressure break cannot flow to the downstream part of downstream packer.It addition,
Fracturing string entirety can be fixed after setting by this downstream packer so that it is position general location is not sent out
Changing, it is thus possible to ensure being smoothed out of fracturing process.
In one embodiment, upstream packer is compression packer, under continuing after downstream packer sets
Put fracturing string and can make upstream packer setting.After downstream packer sets, downstream packer place can be made
Position in well is fixed.Press fracturing string down, the two ends of upstream packer can be applied pressure,
Make it compress and set.The upstream packer using this structure is easy to operate, and efficiency is higher.Upper after setting
Annular space between fracturing string and production string (borehole wall) can be insulated by trip packer, makes pressure during pressure break
Split agent and cannot flow to the upstream end of upstream packer.
In one embodiment, upstream packer is adjacent with fracturing equipment, structure between upstream packer and fracturing equipment
Having made eliminable buffering space, after described buffering space eliminates, described upstream packer squeezes mutually with fracturing equipment
Pressure is so that described upstream packer setting.Fracturing equipment and/or upstream packer can relative with central canal slide, and
Can when transferring tubing string move toward one another, it is thus possible to realize eliminate buffering space effect.Further, this buffering sky
Gap eliminate the need for certain pressure, be only capable of after downstream packer has been fixed realizing.So, Ji Ke
Fracturing string is lowered in well during precalculated position, prevents upstream packer setting；At downstream packer
When needing upstream packer setting after setting, upstream packer end capacity compression is just made to set.
In one embodiment, fracturing string also includes the perforator being connected with central canal, constructs on perforator
Having the perforation tunnel being connected with central canal, perforation tunnel extends to outside fracturing string.When stratum is entered by needs
When row perforation is to produce crack, perforation agent can be made to pass through penetrating on perforator to being filled with perforation agent in central canal
Hole path penetrates, it is achieved perforation.This structure arranges and fracturing string can be made simultaneously to be also equipped with perforation function, thus
Facilitate the use of operating personnel, improve working performance, decrease operating cost, and significantly reduce pipe
Post risk.
In one embodiment, perforator slidingtype is socketed in the circumferential side wall of central canal, is split by upper pressure-raising
Tubing string can make perforator slide so that perforation tunnel is connected with central canal relative to central canal, by transferring pressure break
Tubing string can make perforator slide so that perforation tunnel intercepts mutually with central canal relative to central canal.This set makes
Operating personnel can pass through to carry on simple to make perforation tunnel connect with central canal, is now passed through through central canal and penetrates
Hole agent can realize perforation function.It addition, this set makes the on off state of perforator and fracturing equipment be contrary
, it is thus possible to effectively control the function that fracturing string now realizes, make operating personnel can preferably operate pressure break pipe
Post, it is ensured that the precision of operation.
In one embodiment, fracturing string also includes the balanced valve being connected with lower packer, flat by controlling
Opening or closing of weighing apparatus valve, can make the connection between downstream packer upstream and downstream annular space and obstruct.Pass through
Control the opening and closing of balanced valve, the annular space connection of the upstream and downstream both sides of downstream packer can be made or intercept
Open, and thus pressure in the annular space of the upstream and downstream both sides of downstream packer can be adjusted, so that downstream packing
Device can effectively set and unseal.
In one embodiment, balanced valve is connected with central canal slidingtype, by between central canal and balanced valve
Relatively sliding to make balanced valve open or close, and thus control centre can manage the connection between annular space and resistance
Every.By the balanced valve connection central canal opened and annular space, to carrying out well-flushing in annular space, and impurity can be reclaimed
In central canal.
Compared with prior art, it is an advantage of the current invention that: the fracturing string of the present invention is lowered into ground by (1)
In Ceng, with by fracturing equipment to needing to carry out the crack injection pressure break agent of pressure break, make crack be filled by pressure break agent.
(2) tight gas around the crack of depths and densification oil can be acquired, to improve stratum production capacity herein.
(3) simple in construction, security performance is high.
Accompanying drawing explanation
Hereinafter based on embodiment reference accompanying drawing, the present invention will be described in more detail.Wherein:
Fig. 1 show the fracturing string of the present invention under enter during structural representation.
Fig. 2 shows fracturing string structural representation in perforating process.
Fig. 3 shows fracturing string structural representation in fracturing process.
In the accompanying drawings, identical parts use identical reference.Accompanying drawing is not drawn according to actual ratio.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the fracturing string 100 of the application includes central canal 6.One end of central canal 6
It is connected with the pipeline 1 transferred, so that fracturing string 100 can be lowered into the intended degree of depth smoothly.Under enter pressure
Annular space can be formed between fracturing string 100 and production string 2 after splitting tubing string 100.Additionally at fracturing string 100
Need the fluid used also can be transported in central canal 6 by pipeline 1 during work.
The fracturing string 100 of the application also includes fracturing equipment 7, the fracturing equipment 7 sealed week being socketed in central canal
On sidewall, and it is connected with central canal.As shown in Figure 1, in the upstream of fracturing equipment 7 of the application
Side is provided with upstream packer 5, and the downstream of fracturing equipment 7 is provided with downstream packer 9.
Being provided with pressure break passage in fracturing equipment, pressure break passage is connected with central canal and extraneous annular space.Need
During pressure break, pressure break agent can be filled with in central canal by the pipeline 1 transferred.Pressure break agent can be by pressure break passage
Enter in annular space.Now, upstream packer 5 and downstream packer 9 have set, with insulate annular space and
Formed at annular space outside fracturing equipment 7 and seal space, make pressure break agent cannot flow to seal outside space.Pressure break agent
Constantly enter into seal and space can increase the pressure sealed in space, thus pressure break agent can be made to be easier to be pressed into
In crack.The most not only the crack near production string 2 can effectively be filled by pressure break agent and form support, away from
Also can effectively be filled by pressure break agent from the crack of the depths, stratum of production string 2 deeper inside and be difficult to Guan Bi.So
Crack can be made to be connected with sealing space so that the densification of fine and close oil and tight gas, especially depths is oily and causes
Close gas, can be escaped by crack and collected.Pressure break agent can be the guanidine glue with proppant, and proppant is ball
Shape haydite.
As it is shown in figure 1, fracturing string 100 also includes perforator 4, perforator 4 is sealed is socketed in central canal
Circumferential side wall on, and be connected with central canal 6.Perforator 4 can be arranged on upstream as shown in Figure 1
The upstream side of packer 5.It should be understood that perforator 4 may also be arranged on upstream packer 5 and downstream packing
Between device 9, or it is arranged as required in other positions.This set make fracturing string 100 can pressure break,
Also can perforation, thus facilitate the work of operating personnel, decrease operating cost, improve working performance.?
The perforation tunnel of connection central canal 6 and annular space it is configured with on perforator 4.Needs perforation when, can pass through
Pipeline 1 is passed through perforation agent in central canal, and perforation agent injects on production string through perforation tunnel, and further
It is mapped in stratum, to produce crack.Perforation agent can be the uncrosslinked guanidine glue with quartz sand.
Central canal 6 can be made slideable with fracturing equipment 7 bonded, so that central canal 6 can be relative to fracturing equipment 7
Slide.Fracturing equipment 7 is provided with pressure break passage 71, and on central canal 6, is provided with corresponding hole.?
During transferring fracturing string, fracturing equipment upstream can slide relative to central canal, so that pressure break passage 71
Connect with corresponding hole, thus central canal 6 is connected with fracturing equipment 7, make pressure break agent to penetrate smoothly.Upper
During carrying fracturing string, fracturing equipment downstream can slide relative to central canal so that pressure break passage 71 with
On central canal, stagger in corresponding hole, so that central canal 6 can not connect with fracturing equipment 7, makes the stream in central canal
Body cannot be injected to outside fracturing string 100 by fracturing equipment 7.This is very easy to operation, and improves
The efficiency of fracturing work.
Central canal 6 also can be made slideable with perforator 4 bonded, so that central canal 6 can be relative to perforator
4 slide.Perforator 4 is provided with perforation tunnel 41, and on central canal 6, is provided with corresponding hole.
During transferring fracturing string, perforator downstream slides relative to central canal, so that perforation tunnel 41
Stagger in hole corresponding with on central canal, thus central canal 6 can not connect with perforator 4, the fluid in central canal
Cannot be penetrated by perforator 4.Upper carry fracturing string during, perforator is relative to central canal upstream
Slide, so that the connection of perforation tunnel 41 hole corresponding with on central canal, thus central canal 6 can be with perforator 4
Being connected, the perforation agent in central canal can be penetrated by perforator 4, to produce crack in the earth formation.
Also the balanced valve 8 being connected with downstream packer 9 can be set as shown in Figure 1.The knot of balanced valve
The content that structure is well known to those skilled in the art, is not added with at this repeating.After downstream packer 9 sets,
Balanced valve 8 can connect the annular space of both sides, downstream packer 9 upstream and downstream, so that the upstream and downstream of downstream packer 9
Pressure is equal, so that downstream packer 9 can unseal easily.It addition, balanced valve 8 can also intercept downstream envelope
Every the annular space of the both sides, upstream and downstream of device 9, so that both sides, upstream and downstream keep its pressure respectively, so that under
Trip packer 9 can effectively keep setting, and prevents it from unsealing in advance.
Balanced valve 8 can be connected with central canal, and connects in central canal the annular space outside with central canal.Due to perforation agent
With pressure break agent generally has solid impurity, it is therefore desirable to balanced valve is set to be recycled in central canal by sand grains, this
Sample can prevent solid impurity to be trapped in annular space, thus on the one hand prevents solid impurity to produce fracturing string 100
Raw abrasion, on the other hand prevents solid impurity that fracturing string 100 is stuck in well and can not be proposed, Jin Erbao
The safety in well and stability are demonstrate,proved.
Preferably, balanced valve 8 is bonded with central canal 6 slidingtype, and balanced valve 8 and fracturing equipment 7 equal
It is relatively fixed.Upper carry fracturing string time, central canal upstream slides relative to balanced valve, and balanced valve 8 cuts out,
The aerial fluid of central canal outer shroud cannot enter in central canal by balanced valve 8, and the pressure reduction of packer both sides is also
Can stably keep.When transferring fracturing string, central canal downstream slides relative to balanced valve, and balanced valve 8 leaves
Opening, the inside and outside connection of central canal, it is interior to realize well-flushing that the sand grains in annular space can enter into central canal, and packer
The pressure reduction of both sides eliminates, and packer successfully unseals.This set has further facilitated the use of operating personnel.
Downstream packer 9 can be mechanical type anchor packer, this packer can by carry fracturing string and under
The action putting fracturing string sets.Specifically, the slips on mechanical type anchor packer can by carry
With transfer action card on the inner tubal wall of production string, fix fracturing string, it is achieved location.Then meeting is transferred
Packing element two ends on mechanical type anchor packer produce pressure makes it compress, and the packing element after compression is towards oil reservoir set
Tube swelling also blocks annular space, to realize setting.The structure of mechanical type anchor packer is those skilled in the art
Known content, is not added with at this repeating.This downstream packer 9 is used conveniently and effectively to realize setting.
Preferably, mechanical type anchor packer can use Y211 type packer, uses this packer to be avoided that sand card
Phenomenon, and make fracturing string easily rinse cleaning.
Upstream packer 5 can be compression packer.After downstream packer 9 positions and sets, further under
Put fracturing string 100 and can apply pressure at the upstream and downstream two ends of the packing element of compression packer, make compression make packing
The packing element of device is compression-expansion because of two ends pressurized, to realize setting.This upstream packer 5 can be conveniently effective
Ground realizes setting, thus has further facilitated the use of operating personnel, improves working performance, reduces operation
Cost.Compression packer can be expansion cup packer, uses this packer to be avoided that sand card phenomenon,
And making fracturing string easily rinse cleaning, its structure is well known to those skilled in the art.
Upstream packer 5 can be made at one end to be connected with perforator 4, and the other end is adjacent with fracturing equipment 7, and phase
It is separated with certain buffer gap (as shown in Figure 1).During entering fracturing string under, fracturing equipment and center
Pressure between pipe is little so that although fracturing equipment upstream can slide relative to central canal, but will not will buffer
Space is completely eliminated.And in fracturing process, owing to downstream packer has set, therefore can at fracturing equipment and
Produce bigger pressure between central canal, make fracturing equipment swim slip the most relatively upward so that fracturing equipment with
Upstream packer contacts.At this moment, further transferring fracturing string can be at the packing element two ends of upstream packer
Produce bigger pressure, make upstream packer setting.
Fracturing string 100 can be made only to realize by said structure easily to realize perforation and make by above putting the action put
Industry and fracturing work.And only can realize upstream packer and downstream packer by the action that raises and decentralizes
Set and unseal, very convenient.Fracturing string 100 is made not have the problem that tubing string is lost in well.It addition,
This set makes the pressure break of fracturing string 100 and the perforation can alternately, and degree of freedom is big, thus only carries out one
In secondary well, work can carry out perforation or pressure break to having more stratum, has full-bore after being particularly suited for staged fracturing
The horizontal well of well, drastically increases work efficiency, and can effectively reduce tubing string risk.
Fracturing string 100 also includes the anchor tool 3 of the junction between centrally disposed pipe 6 and pipeline 1.
Anchor tool 3 can stretch out anchor fluke 31 and production string 2 phase when pressure break agent or perforation agent are passed through inside it
Contact, or anchor fluke 31 can be stretched out and contact with production string 2 by static pressure in pipe, with by pressure break pipe
Post 100 is fixed on this depth on stratum.Such structure can guarantee that homework precision, improves fracturing string 100
Stability.The structure of anchor tool 3 is well known to those skilled in the art, and is not added with at this repeating.
Fracturing string 100 also includes the localizer 10 being arranged at the downstream of central canal.Localizer 10 can be to connect
Hoop localizer.Thus with localizer 10, fracturing string 100 can be positioned before perforation or pressure break,
Make perforation and fracture job the most accurate, and upstream packer and downstream packer can be played the work that righting is placed in the middle
With, thus protect fracturing string 100.
As it is shown in figure 1, it is close that central canal 6 is not connected with the downstream of pipeline 1.Central canal 6 can be extended
Extremely through localizer 10, and plug is set in end downstream.So, the fluid in central canal would not
Flow towards unexpected direction.Pressure break agent or perforation agent such as can be made to be maintained in central canal, and pass through
Fracturing equipment or perforator injection.Meanwhile, this set also improves the pressure of injection, makes crack be more prone to,
It is also easier to be filled by pressure break agent.
Centralizing tool also can be set as desired on central canal.Centralizing tool can make fracturing string 100 be in
Intended position, makes fracturing string 100 placed in the middle without the borehole wall that reclines, so that fracturing equipment 7 and perforator
4 all can carry out operation by way of expectations.Here it should be understood that downstream packer is being set to mechanical type
Anchor tool is set while anchor packer, the upper and lower two ends of fracturing string can be realized when fracturing work simultaneously
Fixing, it is thus possible to play certain centralizing function.
The work process of fracturing string is as follows:
State is entered as shown in Figure 1 under fracturing string.During entering fracturing string 100 under, transfer pressure break
Tubing string 100.Owing to the pressure effect of borehole fluid causes central canal 6 to be in the form shown in Fig. 1.Now,
Pressure break passage connects with central canal 6, and perforation tunnel is not attached to lead to central canal 6, and balanced valve 8 cuts out.Grappling
The anchor fluke 31 of instrument 3 do not have owing to anchor tool 3 is internal high-pressure fluid by and be in contraction state.Upstream
Packer 5 and downstream packer 9 are in unset state.It should be noted that now due to not to central canal
Inside it is passed through the pressure break agent of high pressure, does not the most have pressure break agent injection.It is with should also be noted that, now the resistance of fluid
Deficiency, thus between fracturing equipment and upstream packer, have certain buffering space.
The position that fracturing string is transferred is can determine that by localizer 10.When fracturing string 100 is lowered into predetermined
During position, upper lifting pipe post.If now need not perforation, can directly transfer tubing string to carry out pressure break.
If now needing perforation, i.e. keep putting forward state.Now fracturing string is in perforation state as shown in Figure 2.
Due to the action above carried, the relative central canal under the effect of borehole fluid resistance of fracturing equipment now downstream slides
Be not attached to lead to pressure break passage and central canal, and perforator relative to central canal upstream slide into perforation tunnel with in
Heart pipe is connected, and balanced valve 8 is opened.Now being passed through perforation agent to central canal 6 inner high voltage, perforation agent can be preferential
By anchor tool 3, make to extend outside anchor fluke 31 production string 2, with fixing fracturing string.Then, perforation agent
Enter in central canal 6, and eject via the perforator 4 opened, to produce at intended position of stratum
Crack.Owing to now balanced valve is opened, the most at this moment by annular space infusion liquid, well-flushing work can be carried out
Industry, to be recycled to the sand grains in annular space in central canal by the balanced valve opened.Buffering space now is upper
Increase under the action being relatively distant between trip packer and fracturing equipment.
After perforation terminates, not having high-pressure fluid in central canal, the anchor fluke 31 of anchor tool 3 can be regained smoothly.
In order to newly generated crack is carried out fracturing work, can transfer fracturing string 100 and make fracturing equipment 7 substantially with split
Relatively, now upstream packer 5 sets seam, transfers fracturing string further and can eliminate buffering space and make downstream
Packer 9 can set as already mentioned above, seals space to be formed around fracturing equipment 7.
As it is shown on figure 3, now the crack produced can be carried out fracturing work.Pressure break passage now and central canal
6 are connected, and perforation tunnel and central canal are not attached to lead to, and balanced valve 8 cuts out.It is passed through pressure break in central canal 6
Agent, the anchor fluke of anchor tool 3 can stretch out under high pressure is passed through the effect of pressure break agent, solid further to fracturing string
Fixed.Enter into the pressure break agent in central canal 6 and can be ejected into sealing sky by the pressure break passage 71 on fracturing equipment 7
In and crack in.In also entering further into the crack of depths due to the effect pressure break agent of pressure, it is filled out
Fill.
Pressure break is again stepped up fracturing string after terminating, and can the most again be opened by balanced valve,
So that upstream packer 5 and downstream packer 9 can unseal smoothly, the anchor fluke of anchor tool is regained, annular space
In sand grains can pass through balanced valve and be recycled in central canal, with well-flushing again.
Can be relatively free to the stratum in horizontal well is carried out perforation and pressure break by above-mentioned steps.This is for level
The exploitation of well.Especially for for the old well that production capacity is relatively low, it is oily apart from the densification that production string is nearer and causes
Close gas is uniformly gathered.The pressure break oil pipe using the present invention can be again turned on crack, and makes crack deeper, from
And the fine and close oil of higher depth and tight gas all energy can be made collected, thus drastically increase stratum production capacity, have
Effect achieves the purpose of cost efficiency.It addition, this fracturing string simplifies inefficient well repeats the job stream of transformation
Journey, whole during each operation be prone to judge, improve the safety during perforation, pressure break etc. and reliable
Property.This fracturing string applies also for multiple completion hole condition, simple in construction, manufactures, easy to use, it is possible to
It is greatly improved high pressing crack construction safety and reliability in inclined shaft, horizontal well.
Although by reference to preferred embodiment, invention has been described, but without departing from the scope of the present invention
In the case of, it can be carried out various improvement 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. a fracturing string, including:
Central canal,
The fracturing equipment being connected with described central canal, is configured with the pressure break being connected with central canal on described fracturing equipment
Passage, and
The upstream packer being connected with described central canal and downstream packer, upstream packer is arranged on fracturing equipment
Upstream side, downstream packer is arranged on the downstream of fracturing equipment,
Wherein, can be in the external rings vacancy of described fracturing equipment after described upstream packer and downstream packer set
Formed and seal space.
Fracturing string the most according to claim 1, it is characterised in that described fracturing equipment slidingtype is socketed
In the circumferential side wall of central canal.
Fracturing string the most according to claim 2, it is characterised in that carrying fracturing string on by can make
Fracturing equipment slides so that pressure break passage intercepts mutually with central canal relative to central canal, can make by transferring fracturing string
Fracturing equipment slides so that pressure break passage is connected with central canal relative to central canal.
4. according to the fracturing string according to any one of Claim 1-3, it is characterised in that described downstream
Packer is mechanical type anchor packer, by put and put fracturing string downstream packer can be made to set.
5. according to the fracturing string according to any one of claim 1 to 4, it is characterised in that described upstream
Packer is compression packer, continues to transfer fracturing string upstream can be made to seal after described downstream packer sets
Set every device.
Fracturing string the most according to claim 5, it is characterised in that described upstream packer and pressure break
Device is adjacent, and is connected by internal central canal, is configured with and can disappear between described upstream packer and fracturing equipment
The buffering space removed, after described buffering space eliminates, described upstream packer extrudes mutually with fracturing equipment so that institute
State upstream packer setting.
7. according to the fracturing string according to any one of claim 1 to 6, it is characterised in that also include with
The perforator that described central canal is connected, is configured with the perforation tunnel being connected with central canal on described perforator.
Fracturing string the most according to claim 7, it is characterised in that described perforator slidingtype is socketed
In the circumferential side wall of central canal, by carry fracturing string can make perforator relative to central canal slide so that penetrating
Hole path is connected with central canal, perforator can be made to slide so that penetrating relative to central canal by transferring fracturing string
Hole path intercepts mutually with central canal.
9. according to the fracturing string according to any one of claim 1 to 8, it is characterised in that also include with
The balanced valve that described lower packer is connected, by controlling opening or closing of balanced valve, can make downstream insulate
Connection between device upstream and downstream annular space and obstruct.
Fracturing string the most according to claim 9, it is characterised in that described balanced valve is sliding with central canal
Dynamic formula is connected, and balanced valve can be made to open or close by relative slip the between central canal with balanced valve, and can be by
Connection between this control centre pipe and annular space and obstruct.
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| CN201510236616.3A CN106285610B (en) | 2015-05-11 | 2015-05-11 | Fracturing string |
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| CN201510236616.3A CN106285610B (en) | 2015-05-11 | 2015-05-11 | Fracturing string |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359893A (en) * | 2018-04-09 | 2019-10-22 | 中国石油天然气股份有限公司 | Mine sprays fracturing device and operational method |
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| CN110359893A (en) * | 2018-04-09 | 2019-10-22 | 中国石油天然气股份有限公司 | Mine sprays fracturing device and operational method |
| CN110359893B (en) * | 2018-04-09 | 2021-11-30 | 中国石油天然气股份有限公司 | Mine jet fracturing device and operation method |
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