CN106285610B - Fracturing string - Google Patents
Fracturing string Download PDFInfo
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- CN106285610B CN106285610B CN201510236616.3A CN201510236616A CN106285610B CN 106285610 B CN106285610 B CN 106285610B CN 201510236616 A CN201510236616 A CN 201510236616A CN 106285610 B CN106285610 B CN 106285610B
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- central tube
- packer
- fracturing
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- downstream
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 67
- 230000003139 buffering effect Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 5
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 238000007789 sealing Methods 0.000 abstract description 10
- 230000009466 transformation Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 48
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 241000935974 Paralichthys dentatus Species 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000004576 sand Substances 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 4
- 238000000280 densification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of fracturing strings, including:Central tube, the fracturing equipment being connected with central tube, the pressure break channel being connected with central tube is configured on fracturing equipment, and the upstream packer and downstream packer being connected with central tube, upstream packer is arranged in the upstream side of fracturing equipment, downstream packer is arranged in the downstream side of fracturing equipment, wherein can form sealing space in the external rings vacancy of fracturing equipment after upstream packer and downstream packer are set.Stratum production capacity can be improved using this fracturing string, especially can carry out repetition transformation to old well by it has achieved the purpose that cost efficiency further to improve the stratum production capacity of old well.
Description
Technical field
The present invention relates to stimulation technology fields, more particularly to a kind of fracturing string.
Background technology
In recent years, horizontal well multistage fracturing technique is used widely at home.By carrying out perforation and pressure break to stratum
The crack with certain circulation is generated, so that densification oil, tight gas in stratum is escaped, production capacity is higher.
In the prior art, it is usually filled with pressure break agent in fracturing string, pressure break is carried out with fracture, make crack by pressure break
Agent is filled and can not be closed.Using this fracturing string, pressure break agent is difficult to enter into crack, it is easy in annular space flowing from
And it loses.Pressure break agent is only capable of entering in shallower crack in this way, and can not be filled by pressure break agent in deeper crack, to
So that the crack of depths can be quickly closed in the case of no filling, lead to densification oil and tight gas around the crack of depths
It can not be collected out, seriously affect stratum production capacity.
Therefore, it is necessary to a kind of fracturing strings that can improve stratum production capacity.
Invention content
In view of the above-mentioned problems, the present invention proposes a kind of fracturing string, can improve stratum using this fracturing string produces
Energy.
The present invention proposes a kind of fracturing string, including:Central tube, the fracturing equipment being connected with central tube, on fracturing equipment
It is configured with the pressure break channel being connected with central tube, and the upstream packer and downstream packer being connected with central tube, upstream
Packer is arranged in the upstream side of fracturing equipment, and downstream packer is arranged in the downstream side of fracturing equipment, wherein in upstream packer and
Downstream packer can form sealing space after setting in the external rings vacancy of fracturing equipment.
The fracturing string of the present invention is lowered into stratum, to be pressed by fracturing equipment needing the crack for carrying out pressure break to spray
Agent is split, crack is made to be filled and be supported by pressure break agent.In fracturing process, in the upstream packer of fracturing equipment upstream and in pressure break
The downstream packer in device downstream is set, and so as to form sealing space around fracturing equipment, pressure break agent is enable to be maintained at this
In space.It is passed through pressure break agent through central tube in this way, and pressure break agent can be constantly ejected by pressure break channel.In the process,
Pressure in sealing space increases, and is pressed into crack to which pressure break agent can be caused to be closed pressure larger in space, makes depth
The crack at place can also be filled by pressure break agent.In this way, can make crack between to be connected in well, the tight gas around fracture with
Fine and close oil is even acquired the tight gas around the crack of depths with fine and close oil, to improve stratum production capacity herein.
In one embodiment, fracturing equipment slidingtype is socketed in the circumferential side wall of central tube, by above carrying fracturing string
Fracturing equipment can be made to be slided relative to central tube so that pressure break channel is mutually obstructed with central tube, pressure break can be made by decentralization fracturing string
Device is slided relative to central tube so that pressure break channel is connected with central tube.In this way, after tripping in fracturing string, it can be by above carrying
Action with decentralization makes central tube slide into the position of needs and realizes the control of the connected state to central tube and pressure break channel.
This structure enables operating personnel by simply acting, and to fracturing process more freely and accurately control.
In one embodiment, downstream packer is mechanical anchor packer, can be made by lifting from the top and puting down fracturing string
Downstream packer is set.It can be lowered into expected pressure break position in fracturing string using this packer as downstream packer
Afterwards, only by raising and decentralizing this shirtsleeve operation of tubing string, you can realize setting for downstream packer, easy to operate, efficiency
It is high.Downstream packer after setting can insulate the annular space between fracturing string and production string (borehole wall), when making pressure break
Pressure break agent can not flow at the downstream of downstream packer.In addition, this downstream packer can be to fracturing string after setting
Entirety is fixed, and so that its position general location is not changed, to can guarantee being smoothed out for fracturing process.
In one embodiment, upstream packer is compression packer, continues decentralization pressure after downstream packer is set
Upstream packer setting can be made by splitting tubing string.After downstream packer is set, the position where can making downstream packer in well is solid
It is fixed.At this moment fracturing string is further pushed, pressure can be applied to the both ends of upstream packer, it is made to compress and set.Use this
The upstream packer of kind structure is easy to operate, and efficiency is higher.Upstream packer after setting can be to fracturing string and production string
Annular space between (borehole wall) is insulated, and makes pressure break agent when pressure break that can not flow to the upstream end of upstream packer.
In one embodiment, upstream packer is adjacent with fracturing equipment, is configured between upstream packer and fracturing equipment
Eliminable buffering gap, after the buffering gap is eliminated, the upstream packer is mutually squeezed with fracturing equipment so that on described
Swim packer setting.Fracturing equipment and/or upstream packer opposite with central tube can slide, and can in opposite directions be transported when transferring tubing string
It is dynamic, so as to realize the effect for eliminating buffering gap.Also, this buffering gap eliminates the need for certain pressure, is only capable of under
Trip packer could be realized after having fixed.In this way, can prevent during fracturing string is lowered into precalculated position in well
Only upstream packer setting;When needing upstream packer setting after downstream packer is set, just make upstream packer end by
It presses and sets.
In one embodiment, fracturing string further includes the perforator being connected with central tube, be configured on perforator with
The perforation tunnel that central tube is connected, perforation tunnel extend to except fracturing string.When need to stratum carry out perforation to generate
When crack, perforation agent can be enable to be projected by the perforation tunnel on perforator, realize perforation to being filled with perforation agent in central tube.
This structure setting can make fracturing string while be also equipped with perforation function, to facilitate the use of operating personnel, improve work
Industry efficiency reduces operating cost, and significantly reduces tubing string risk.
In one embodiment, perforator slidingtype is socketed in the circumferential side wall of central tube, by above carrying fracturing string
Perforator can be made to be slided relative to central tube so that perforation tunnel is connected with central tube, perforation can be made by decentralization fracturing string
Device is slided relative to central tube so that perforation tunnel is mutually obstructed with central tube.It is simple that this set enables operating personnel to pass through
Upper actuating work makes perforation tunnel be connected to central tube, and being passed through perforation agent through central tube at this time can be realized perforation function.In addition, this
Kind setting is so that the on off state of perforator and fracturing equipment is opposite, so as to effectively control the work(that fracturing string is realized at this time
Can, so that operating personnel is preferably operated fracturing string, ensure that the precision of operation.
In one embodiment, fracturing string further includes the balanced valve being connected with lower packer, by controlling balanced valve
Open or close, can be so that connection and barrier between downstream packer upstream and downstream annular space.By controlling balanced valve
It opens and closes, can be so that the annular space connection or barrier of the upstream and downstream both sides of downstream packer be opened, and thus, it is possible to be insulated to downstream
Pressure is adjusted in the annular space of the upstream and downstream both sides of device, so that downstream packer effectively can set and unseal.
In one embodiment, balanced valve is connected with central tube slidingtype, by opposite between central tube and balanced valve
Sliding can be such that balanced valve opens or closes, and thus control centre can manage connection and barrier between annular space.By open
Balanced valve is connected to central tube and annular space, can be recovered in central tube to carrying out well-flushing in annular space, and by impurity.
Compared with the prior art, the advantages of the present invention are as follows:(1) fracturing string of the present invention is lowered into stratum, with
By fracturing equipment to needing the crack for carrying out pressure break to spray pressure break agent, crack is made to be filled by pressure break agent.(2) depths can be split
Tight gas and fine and close oil around stitching are acquired, to improve stratum production capacity herein.(3) simple in structure, security performance is high.
Description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 shows structural schematic diagram of the fracturing string of present invention during tripping in.
Fig. 2 shows structural schematic diagram of the fracturing string in perforating process.
Fig. 3 shows structural schematic diagram of the fracturing string in fracturing process.
In the accompanying drawings, identical component uses identical reference numeral.Attached drawing is not drawn according to actual ratio.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings.
As shown in Figure 1, the fracturing string 100 of the application includes central tube 6.It is used with decentralization one end of central tube 6
Pipeline 1 be connected so that fracturing string 100 can smoothly be lowered into expected depth.It can be in pressure break after tripping in fracturing string 100
Annular space is formed between tubing string 100 and production string 2.In addition need the fluid used that can also pass through when fracturing string 100 works
Pipeline 1 is transported in central tube 6.
The fracturing string 100 of the application further includes fracturing equipment 7, the sealed circumferential side wall for being socketed in central tube of fracturing equipment 7
On, and be connected with central tube.As shown in Figure 1, the upstream side of the fracturing equipment of the application 7 is provided with upstream packer
5, the downstream side of fracturing equipment 7 is provided with downstream packer 9.
Pressure break channel is provided in fracturing equipment, pressure break channel is connected with the annular space of central tube and the external world.Need pressure break
When, pressure break agent can be filled with into central tube by the pipeline 1 of decentralization.Pressure break agent can be entered by pressure break channel in annular space.
At this point, upstream packer 5 and downstream packer 9 have been set, formed at the annular space except fracturing equipment 7 close with insulating annular space
Space is sealed, makes pressure break agent that can not flow to except sealing space.Pressure break agent, which constantly enters, will increase sealing space in sealing space
In pressure, so that pressure break agent can be made to be easier to be pressed into crack.It can be pressed in crack so not only near production string 2
It splits agent and effectively fills and formed support, the crack apart from the stratum depths of 2 deeper inside of production string also can effectively be filled out by pressure break agent
It fills and is not easy to be closed.It in this way can be so that crack be connected with sealing space so that the cause of fine and close oil and tight gas, especially depths
Close oil and tight gas, can be escaped by crack and be collected.Pressure break agent can be the guanidine glue with proppant, and proppant is spherical shape
Haydite.
As shown in Figure 1, fracturing string 100 further includes perforator 4, the sealed peripheral side for being socketed in central tube of perforator 4
On wall, and it is connected with central tube 6.Perforator 4 can be arranged as shown in Figure 1 in the upstream side of upstream packer 5.Ying Li
Solution ground is that perforator 4 may also be arranged between upstream packer 5 and downstream packer 9, or be arranged as required in other positions
It sets.This set make fracturing string 100 can pressure break, also can perforation reduce work to facilitate the work of operating personnel
Industry cost, improves operating efficiency.The perforation tunnel of connection central tube 6 and annular space is configured on perforator 4.Needing perforation
When, perforation agent can be passed through into central tube by pipeline 1, perforation agent is injected on production string through perforation tunnel, gone forward side by side
One step is mapped in stratum, to generate crack.Perforation agent can be the uncrosslinked guanidine glue with quartz sand.
Central tube 6 and 7 slideable key connection of fracturing equipment can be enabled, so that central tube 6 can be slided relative to fracturing equipment 7.
It is provided with pressure break channel 71 on fracturing equipment 7, and is provided with corresponding hole on central tube 6.In the process of decentralization fracturing string
In, fracturing equipment can upstream be slided relative to central tube so that pressure break channel 71 and corresponding hole are connected to, to central tube 6 with
Fracturing equipment 7 is connected, and pressure break agent is enable smoothly to project.It is upper carry fracturing string during, fracturing equipment can be relative to central tube
It downstream slides, so that the hole corresponding on central tube of pressure break channel 71 is staggered, to prevent central tube 6 with fracturing equipment 7 from connecting
It is logical, make the fluid in central tube that can not be injected to except fracturing string 100 by fracturing equipment 7.This greatly facilitates operation, and
Improve the efficiency of fracturing work.
Central tube 6 and 4 slideable key connection of perforator can be also enabled, so that central tube 6 can be slided relative to perforator 4.
It is provided with perforation tunnel 41 on perforator 4, and is provided with corresponding hole on central tube 6.In the mistake of decentralization fracturing string
Cheng Zhong, perforator are downstream slided relative to central tube, so that the hole corresponding on central tube of perforation tunnel 41 is staggered, in
Heart pipe 6 cannot be connected to perforator 4, and the fluid in central tube can not be projected by perforator 4.In the upper process for carrying fracturing string
In, perforator is upstream slided relative to central tube, so that the hole connection corresponding on central tube of perforation tunnel 41, to center
Pipe 6 can be connected with perforator 4, and the perforation agent in central tube can be projected by perforator 4, to generate crack in the earth formation.
Can also be as shown in Figure 1, the balanced valve 8 being connected with downstream packer 9 is set.The structure of balanced valve is ability
Content known to the technical staff in domain is not added with repeats herein.After downstream packer 9 is set, balanced valve 8 can be connected to downstream envelope
Annular space every 9 upstream and downstream both sides of device, so that the upstream and downstream pressure of downstream packer 9 is equal, to enable 9 side of downstream packer
Just it unseals.In addition, balanced valve 8 can also obstruct the annular space of the upstream and downstream both sides of downstream packer 9, so that upstream and downstream both sides point
Its pressure is not kept, so that downstream packer 9 can effectively keep setting, prevents it from unsealing in advance.
Balanced valve 8 can be connected with central tube, and be connected in central tube and the annular space outside central tube.Due to perforation agent and pressure break
Usually there is solid impurity in agent, it is therefore desirable to balanced valve be set so that sand grains to be recycled in central tube, solid-state can be prevented miscellaneous in this way
Matter is trapped in annular space, on the one hand solid impurity be prevented to generate abrasion to fracturing string 100, is on the other hand prevented
Fracturing string 100 is stuck in well and cannot propose by solid impurity, and then ensure that the safety in well and stability.
Preferably, balanced valve 8 is keyed with 6 slidingtype of central tube, and balanced valve 8 and fracturing equipment 7 are relatively fixed.
It is upper carry fracturing string when, central tube is upstream slided relative to balanced valve, balanced valve 8 close, the aerial stream of central tube outer shroud
Body can not be entered by balanced valve 8 in central tube, and the pressure difference of packer both sides can also stablize holding.In decentralization fracturing string
When, central tube is downstream slided relative to balanced valve, and balanced valve 8 is opened, the inside and outside connection of central tube, and the sand grains in annular space can enter
To realize well-flushing in central tube, and the pressure difference of packer both sides is eliminated, and packer successfully unseals.This set is further square
Operating personnel use.
Downstream packer 9 can be mechanical anchor packer, and this packer can be bled off pressure by above carrying fracturing string under
The action for splitting tubing string is set.Specifically, the slips on mechanical anchor packer can be by raising and decentralizing action card
On the inner tubal wall of production string, fracturing string is fixed, realizes positioning.Then decentralization can be on mechanical anchor packer
Packing element both ends, which generate pressure, makes its compression, compressed packing element that annular space is expanded and blocked towards production string, is set with realizing.Machine
The content that the structure of tool formula anchor packer is well known to those skilled in the art, is not added with repeats herein.Use this downstream
Packer 9 can be realized conveniently and effectively and be set.Preferably, Y211 type packers can be used in mechanical anchor packer, use
This packer is avoided that sand card phenomenon, and fracturing string is made to be easy to rinse cleaning.
Upstream packer 5 can be compression packer.After downstream packer 9 positions and sets, pressure break is further transferred
Tubing string 100 can apply pressure at the upstream and downstream both ends of the packing element of compression packer, and compression is made to make the packing element of packer because of both ends
It is pressurized and compression-expansion, is set with realizing.This upstream packer 5, which can be realized conveniently and effectively, to be set, to further square
Operating personnel use, improve operating efficiency, reduce operating cost.Compression packer can be expansion leather cup type envelope
Every device, sand card phenomenon is avoided that using this packer, and fracturing string is made to be easy to rinse cleaning, structure is this field
Known to technical staff.
Upstream packer 5 can be enabled to be connected at one end with perforator 4, and the other end is adjacent with fracturing equipment 7, and be mutually separated with certain
Buffer gap (as shown in Figure 1).During tripping in fracturing string, the pressure between fracturing equipment and central tube is little, makes
Although obtaining fracturing equipment upstream to slide relative to central tube, but not buffering gap is completely eliminated.And in fracturing process,
Since downstream packer has been set, larger pressure can be generated between fracturing equipment and central tube, makes fracturing equipment into one
Step trip sliding relatively upward, to make fracturing equipment be in contact with upstream packer.At this moment, fracturing string is further transferred
In upstream, the packing element both ends of packer generate larger pressure, make upstream packer setting.
By above structure can make fracturing string 100 realize only by the action lifted from the top and puted down easily realize perforating job and
Fracturing work.And can setting and unsealing for upstream packer and downstream packer only be realized by the action raised and decentralized,
It is very convenient.It is not in that tubing string loses the problem in well to make fracturing string 100.In addition, this set makes fracturing string 100
Pressure break and perforation can alternately, degree of freedom is big, and perforation can be carried out to having more stratum to only carry out work in well
Or pressure break, it is particularly suitable for the horizontal well with full-bore wellbore after staged fracturing, greatly improves working efficiency, and energy
Effectively reduce tubing string risk.
Fracturing string 100 further includes the anchor tool 3 of the junction between centrally disposed pipe 6 and pipeline 1.Anchor tool
3 can pressure break agent or perforation agent inside it by when, stretch out anchor fluke 31 and be in contact with production string 2, or can be by pipe
Static pressure and stretch out anchor fluke 31 and be in contact with production string 2, fracturing string 100 is fixed on to this depth on stratum.This
The structure of sample can guarantee homework precision, improve the stability of fracturing string 100.The structure of anchor tool 3 is the technology of this field
Known to personnel, it is not added with repeats herein.
Fracturing string 100 further includes the locator 10 for the downstream for being set to central tube.Locator 10 can be that box cupling positions
Device.So as to before perforation or pressure break, be positioned to fracturing string 100 with locator 10, make perforation and fracture job more
To be accurate, and righting effect placed in the middle can be played to upstream packer and downstream packer, to protect fracturing string 100.
As shown in Figure 1, the downstream that central tube 6 is not connected with pipeline 1 is closed.Central tube 6 can be extended to across fixed
Position device 10, and silk plug is set in end downstream.In this way, the fluid in central tube would not be flowed towards unexpected direction
It moves.Such as pressure break agent or perforation agent can be made to be maintained in central tube, and projected by fracturing equipment or perforator.Meanwhile this
Kind setting also improves the pressure of injection, so that crack is more prone to, is also easier to be filled by pressure break agent.
Centralizing tool can also be set as desired on central tube.Centralizing tool can make fracturing string 100 be in expection
Position, make fracturing string 100 between two parties without the borehole wall that reclines, so that fracturing equipment 7 and perforator 4 can be with expected sides
Formula carries out operation.Here it should be understood that anchoring is arranged while setting downstream packer to mechanical anchor packer
Tool can realize the fixation of fracturing string upper and lower ends simultaneously, so as to play certain centralizing function in fracturing work.
The course of work of fracturing string is as follows:
The tripping in state of fracturing string is as shown in Figure 1.During tripping in fracturing string 100, fracturing string is transferred
100.Since the pressure effect of borehole fluid causes central tube 6 to be in form shown in FIG. 1.At this point, pressure break channel and center
Pipe 6 is connected to, and perforation tunnel is not attached to lead to central tube 6, and balanced valve 8 is closed.The anchor fluke 31 of anchor tool 3 is due to anchor tool 3
Internal no high-pressure fluid by by be in contraction state.Upstream packer 5 and downstream packer 9 are in unset state.It answers
It is noted that not having pressure break agent injection at this time due to not being passed through the pressure break agent of high pressure into central tube at this time.It should also be noted that
Ground is that the resistance of fluid is insufficient at this time, to there is certain buffering gap between fracturing equipment and upstream packer.
It can determine the position of fracturing string decentralization by locator 10.When fracturing string 100 is lowered into scheduled position,
Upper lifting pipe post.If not needing perforation at this time, you can directly decentralization tubing string is to carry out pressure break.
If needing perforation at this time, that is, keep putting forward state.Fracturing string is in perforation state as shown in Figure 2 at this time.Due to
The action above carried, fracturing equipment at this time opposite central tube under the action of borehole fluid resistance downstream slide into pressure break channel with
Central tube is not attached to lead to, and perforator upstream slides into perforation tunnel with respect to central tube and is connected with central tube, and balanced valve 8 is beaten
It opens.Into central tube 6, high pressure is passed through perforation agent at this time, and perforation agent can make to extend to oil reservoir outside anchor fluke 31 preferentially by anchor tool 3
Casing 2, to fix fracturing string.Then, perforation agent enters in central tube 6, and is ejected via open perforator 4, with
Crack is generated at expected position of stratum.Since balanced valve is open at this time, fluid injection body is pumped by annular space at this moment,
Clean-out service can be carried out, the sand grains in annular space is recycled to by open balanced valve in central tube.Buffering gap at this time
Increase under the action being relatively distant between upstream packer and fracturing equipment.
After perforation, can smoothly it be withdrawn without high-pressure fluid, the anchor fluke 31 of anchor tool 3 in central tube.In order to new
The crack of generation carries out fracturing work, can transfer fracturing string 100 and keep fracturing equipment 7 substantially opposite with crack, and upstream is sealed at this time
It is set every device 5, buffering gap can be eliminated and downstream packer 9 is enable to sit as already mentioned above by further transferring fracturing string
Envelope, to form sealing space around fracturing equipment 7.
As shown in figure 3, at this time fracturing work can be carried out to the crack of generation.Pressure break channel at this time is connected with central tube 6
Logical, perforation tunnel is not attached to lead to central tube, and balanced valve 8 is closed.Pressure break agent, the anchor fluke of anchor tool 3 are passed through into central tube 6
It can be stretched out under the action of high pressure is passed through pressure break agent, fracturing string is further fixed.The pressure break agent entered in central tube 6 can
By the pressure break channel 71 on fracturing equipment 7 be ejected into sealing space and crack in.Since the effect pressure break agent of pressure can also be into
One step, which enters in the crack of depths, fills it.
Fracturing string is again stepped up after pressure break, you can as shown in Figure 2 again open balanced valve, to make
Obtaining upstream packer 5 and downstream packer 9 can smoothly unseal, and the anchor fluke of anchor tool is withdrawn, and the sand grains in annular space can smoothly lead to
Overbalance valve is recycled in central tube, with well-flushing again.
It can be relatively free to carry out perforation and pressure break to the stratum in horizontal well through the above steps.This is for horizontal well
Exploitation.For the lower old well of production capacity, the densification oil closer apart from production string and tight gas are uniform
Acquisition.Can be again turned on crack using the pressure break oil pipe of the present invention, and keep crack deeper, so as to make higher depth densification oil and
Tight gas can be collected, and to greatly improve stratum production capacity, effectively realize the purpose of cost efficiency.In addition, this
Kind fracturing string simplifies the work flow that inefficient well repeats transformation, and each process in whole process is easy to judge, improves and penetrate
Safety and reliability during hole, pressure break etc..This fracturing string applies also for a variety of completion hole conditions, simple in structure,
It manufactures, is easy to use, safety and reliability of the high pressing crack construction in inclined shaft, horizontal well can be greatly improved.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited in texts
Disclosed in specific embodiment, but include all technical solutions fallen within the scope of the appended claims.
Claims (8)
1. a kind of fracturing string, including:
Central tube,
The fracturing equipment being connected with the central tube is configured with the pressure break channel being connected with central tube on the fracturing equipment, with
And
The upstream packer and downstream packer being connected with the central tube, upstream packer are arranged in the upstream side of fracturing equipment,
Downstream packer is arranged in the downstream side of fracturing equipment,
Wherein, it can be formed and be sealed in the external rings vacancy of the fracturing equipment after the upstream packer and downstream packer are set
Space,
The fracturing equipment slidingtype is socketed in the circumferential side wall of central tube,
Fracturing equipment can be made to be slided relative to central tube so that pressure break channel is mutually obstructed with central tube by above carrying fracturing string, passed through
Decentralization fracturing string can be such that fracturing equipment is slided relative to central tube so that pressure break channel is connected with central tube.
2. fracturing string according to claim 1, which is characterized in that the downstream packer insulates for mechanical slips
Device can be such that downstream packer sets by lifting from the top and puting down fracturing string.
3. fracturing string according to claim 1 or 2, which is characterized in that the upstream packer is compression packer,
Upstream packer setting can be made by continuing decentralization fracturing string after the downstream packer is set.
4. fracturing string according to claim 3, which is characterized in that the upstream packer is adjacent with fracturing equipment, and leads to
It crosses internal central tube to be connected, eliminable buffering gap is configured between the upstream packer and fracturing equipment, described
After buffering gap elimination, the upstream packer is mutually squeezed with fracturing equipment so that the upstream packer setting.
5. fracturing string according to claim 4, which is characterized in that further include the perforator being connected with the central tube,
The perforation tunnel being connected with central tube is configured on the perforator.
6. fracturing string according to claim 5, which is characterized in that the perforator slidingtype is socketed in the week of central tube
To on side wall, perforator can be made to be slided relative to central tube so that perforation tunnel is connected with central tube by above carrying fracturing string
It is logical, perforator can be made to be slided relative to central tube so that perforation tunnel is mutually obstructed with central tube by transferring fracturing string.
7. fracturing string according to claim 6, which is characterized in that further include the balance being connected with the downstream packer
Valve can be so that be connected to and barrier by controlling opening or closing for balanced valve between downstream packer upstream and downstream annular space.
8. fracturing string according to claim 7, which is characterized in that the balanced valve is connected with central tube slidingtype, leads to
The opposite sliding crossed between central tube and balanced valve can be such that balanced valve opens or closes, and can thus control centre's pipe and annular space it
Between connection and barrier.
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CN102562019A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Sand jet perforation annular mechanical packing multilayer fracturing tool pipe column and modification process |
CN102979496A (en) * | 2012-11-14 | 2013-03-20 | 中国石油天然气股份有限公司 | Coiled tubing multilayer fracturing acidizing process tubular column and use method thereof |
CN103573239A (en) * | 2012-07-31 | 2014-02-12 | 中国石油化工股份有限公司 | Staged fracturing device and using method thereof |
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US7946340B2 (en) * | 2005-12-01 | 2011-05-24 | Halliburton Energy Services, Inc. | Method and apparatus for orchestration of fracture placement from a centralized well fluid treatment center |
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CN101818638A (en) * | 2010-04-26 | 2010-09-01 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fracturing and separate zone production combined operation device and method |
CN102562019A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Sand jet perforation annular mechanical packing multilayer fracturing tool pipe column and modification process |
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