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CN106285610B - Fracturing string - Google Patents

Fracturing string Download PDF

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Publication number
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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China
Prior art keywords
central tube
packer
fracturing
upstream
downstream
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CN106285610A (en
Inventor
刘阳
秦金立
陈作
刘明
崔晓杰
尹垒
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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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

Fracturing string
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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