CN106150429A - Shale gas is multistage splits pressure diverting agent, without bridging plug fracturing process and device - Google Patents
Shale gas is multistage splits pressure diverting agent, without bridging plug fracturing process and device Download PDFInfo
- Publication number
- CN106150429A CN106150429A CN201610718280.9A CN201610718280A CN106150429A CN 106150429 A CN106150429 A CN 106150429A CN 201610718280 A CN201610718280 A CN 201610718280A CN 106150429 A CN106150429 A CN 106150429A
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- Prior art keywords
- interval
- diverting agent
- fracturing
- agent
- pressure break
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Abstract
The application relates to oil gas field of engineering technology, particularly relates to a kind of shale gas multistage fracturing diverting agent and application.In the diverting agent of the embodiment of the present invention, soluble fiber forms highdensity spacial framework, the most controlledly extends the most stifled time, reaches to replace the purpose of bridging plug；Plugging effect is good, and de-plugging automatically after pressure break, acidifying, to reservoir fanout free region.After the method for the embodiment of the present invention completes one-level pressure break, utilizing being controlled property of diverting agent temporarily to block, bottom pressure is opened after raising and is not transformed new stratum, opens new crack, thus realizes dynamic classification, it is not necessary to use bridging plug.
Description
Technical field
The application relates to oil gas field of engineering technology, particularly relates to a kind of shale gas multistage fracturing diverting agent and answers
With.
Background technology
The form of waterpower multistage fracturing is mainly taked in the exploitation of present stage shale gas, and multistage fracturing can improve fracturing
Efficiency, reduce using and reducing work hours of the water yield.Between fracturing construction at different levels, the mode of lower bridging plug is usually taken,
It is spaced each pressure break level, after every grade of pressure break perforation terminates, uses continuous tubing drill to grind off bridging plug, be that whole pit shaft connects,
Reach the condition of aerogenesis.
In present stage waterpower multistage fracturing is constructed, the usual technique of employing is by using bridging plug to complete classification, lower bridge
Plug and bridging plug bore mill workload, create unnecessary cost and engineering time.
Summary of the invention
The application is mainly solving the technical problems that provide a kind of new shale gas multistage fracturing diverting agent and application
The method of the multistage fracturing without bridging plug that this diverting agent is implemented, it is possible to make soluble fiber form highdensity spatial network knot
Structure, effectively extends the most stifled time, reaches to replace the purpose of bridging plug, uses this diverting agent can change existing multistage fracturing work
Skill.
For solving above-mentioned technical problem, the technical scheme that the embodiment of the present invention uses is: provide
A kind of shale gas multistage fracturing diverting agent, including:
Carry liquid；
Biodegradable polyester fiber；
Proppant；With
Linear colloid.
Preferably, described proppant one in sand, bead, ceramic particle, polymeric beads or hollow glass ball
Or it is multiple.
Preferably, the length of described biodegradable polyester fiber is more than 5mm.
Preferably, carry liquid described in include:
The guanidine glue of 0.2～0.6 weight portion；
The antibacterial of 0.1～0.5 weight portion；
The viscous steady agent of 0.3～0.7 weight portion；
The cleanup additive of 0.3～0.8 weight portion；With
The sodium carbonate of 0.1～0.5 weight portion.
For solving above-mentioned technical problem, another technical scheme that the embodiment of the present invention uses is: provide a kind of without bridging plug
The method of multistage fracturing, tool string is delivered to the first interval, penetrates by the mode pushed first by cable transmission and fluid power
After hole, pressure break, with the serosity of above-mentioned diverting agent, the first interval fracturing fracture is temporarily blocked；Secondly the second interval is entered
Row perforation, the second interval is formed crack by pressure break under the effect of the first interval sealing agent, with the serosity pair of above-mentioned diverting agent
Second interval fracturing fracture temporarily blocks；Then next interval being carried out perforation, this interval is at last layer section sealing agent
Formed crack by pressure break under effect, with the serosity of above-mentioned diverting agent, this interval fracturing fracture is temporarily blocked, through too much
Level completes the construction of each interval after repeating；Finally make diverting agent dissolve with acidic leach medium, form passage, completion, open flow.
Preferably, the method includes:
(1) drifting；
(2) multistage fracturing completion；
(3) acid fracturing dissolves；
Wherein, step (2) including:
(21) tool string is delivered to the first of the pit shaft that step (1) is formed by the way of cable transmission and fluid power propelling movement
At interval, carry out the first interval perforation；
(22) in the first interval of pit shaft, pump into fracturing fluid and carry out the first interval pressure break；
(23) with the serosity of above-mentioned diverting agent, the first interval fracturing fracture is temporarily blocked；
(24) precalculated position that will carry on tool string to the second interval, carries out the second interval perforation；
(25) second intervals are formed crack by pressure break under the effect of the first interval sealing agent；
(26) with the serosity of above-mentioned diverting agent, the second interval fracturing fracture is temporarily blocked；
(27) according to completion number of fragments, repetition step (24), to step (26), completes each layer after multistage repetition
Section construction；
Wherein, after pressure break terminates, do not carry out open flow.
Present invention also offers a kind of without bridging plug multistage fracturing device, including for the first assembly to the first interval construction
With for the second assembly that other intervals are constructed, wherein,
First assembly includes the first detent mechanism, first igniter head, the first perforating gun and the fracturing fluid concatenated by oil pipe
Conveying mechanism；
Cable that second assembly includes being sequentially connected with, end, the second detent mechanism, second point duration and degree of heating, the second perforating gun
With diverting agent pumping mechanism.
Preferably, described second assembly also includes the mechanism that increases the weight of being located between end and the second detent mechanism, described
Diverting agent pumping mechanism includes pressure detector.
The embodiment of the present application provides the benefit that: be different from the situation of prior art, in the diverting agent of the embodiment of the present invention
Soluble fiber forms highdensity spacial framework, effectively extends the most stifled time, reaches to replace the purpose of bridging plug；Closure effect
The best, de-plugging automatically after pressure break, acidifying, to reservoir fanout free region.After the method for the embodiment of the present invention completes one-level pressure break, utilize temporarily
Blocking agent temporarily blocks, and bottom pressure is opened after raising and do not transformed new stratum, opens new crack, thus realizes dynamically dividing
Level, it is not necessary to use bridging plug.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present application, will make required in the embodiment of the present application below
Accompanying drawing be briefly described.It should be evident that drawings described below is only some embodiments of the application, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 be the embodiment of the present invention device in the structural representation of the first assembly；
Fig. 2 be the embodiment of the present invention device in the structural representation of the second assembly.
Detailed description of the invention
In order to make the purpose of the application, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The application is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the application, not
For limiting the application.
Some embodiments of theme disclosed by the invention are probably and explain with the process of horizontal well, but equally applicable
Well in any direction.It should also be appreciated by one skilled in the art that throughout the specification, when the scope of concentration or consumption is retouched
State for available or be suitable for etc. time, it is intended to represent any and each concentration within the range or consumption (including end points)
It is considered to be stated.Additionally, each numerical value is considered as modifying once (unless the most so repaiied through term " about "
Decorations), it is considered without so modifying the most again, unless be otherwise noted within a context.Such as, " scope of 1-10 " it is understood that
For referring to each and each possible numerical value of the successive range along about 1-about 10.In other words, when the model certain in statement
When enclosing, even if only having several concrete data points to be positively identified or mention, even if or within the range within the range
Data point is not had to be mentioned, it should also be appreciated that the present inventor is appreciated and understood that any and all of number in the range of this
Strong point is regarded as the most specifically mentioning, and the present inventor have gamut and should in the range of institute a little.Also
It should be appreciated that crack stifled/Guan Bi temporarily includes partial fracture stifled/Guan Bi temporarily.
Embodiments provide a kind of shale gas multistage fracturing diverting agent, including: carry liquid；Degradable polyester is fine
Dimension；Proppant；And linear colloid.
As used herein, term fracturing processes and refers to pump fluid in well with wound with powerful hydraulic pump
Build the technique that enough down-hole pressures make formation fracture or pressure break.This makes to inject in stratum by the fluid carrying proppant,
Thus produce the high osmosis sand region that fluid can flow through.Once removing hydraulic pressure, proppant remains in situ, therefore supports
Agent is opened crack and strengthens fluid inflow well or flow out from well.The present invention adds in carrying liquid under certain condition may be used
The most stifled fiber dissolved, owing to soluble fiber can form highdensity spacial framework, this structure possesses stronger
Shut-off capacity, biodegradable fiber has the most stifled effect in acid condition, thus greatly improves the intensity of temporarily blocking layer.
In one preferred embodiment, by weight, the diverting agent of the embodiment of the present invention includes: 90～95 carry
Liquid, more than 2.0 biodegradable polyester fibers, 20～35 proppants, 0.45 linear glue.Further, fibre length is more than 5mm, can
Being 5～10mm, it is also possible to be > 10mm, carries liquid and includes: the guanidine glue of 0.2～0.6 weight portion, 0.1～0.5 the killing of weight portion
Microbial inoculum, 0.3～0.7 weight portion viscous steady agent, 0.3～0.8 weight portion cleanup additive and the sodium carbonate of 0.1～0.5 weight portion.
Owing to soluble fiber forms highdensity spacial framework, effectively extend the most stifled time, reach to replace bridging plug
Purpose.Plugging effect is good, and de-plugging automatically after pressure break, acidifying, to reservoir fanout free region.Those of ordinary skill in the art should know
Dawn, in specific implementation process, adjust according to the temperature and pressure of construction interval, and duration needed for pressure break, adjust the present invention and implement
The diverting agent proportioning of example and acid concentration, reach to transform the current reservoir period, the plugging effect to fractured interval, if desired, and can
Carry out repeating to block up, to complete the continuous pressure break of multi-section multi-layer temporarily to blocking up reservoir the most temporarily.
Proppant can be solid particle, and such as, proppant is selected from sand, bead, ceramic particle, polymeric beads or hollow
One or more in glass bead.
The embodiment of the present invention additionally provides a kind of applies above-mentioned diverting agent to carry out the method without bridging plug multistage fracturing, first makes
Tool string is delivered to the first interval by the mode pushed with cable transmission and fluid power, after carrying out perforation, pressure break, blocks up temporarily with above-mentioned
First interval fracturing fracture is temporarily blocked by the serosity of agent；Secondly the second interval being carried out perforation, the second interval is first
Formed crack by pressure break under the effect of interval sealing agent, with the serosity of above-mentioned diverting agent, the second interval fracturing fracture is carried out temporarily
Time closure；Then next interval being carried out perforation, this interval is formed crack by pressure break under the effect of last layer section sealing agent, uses
This interval fracturing fracture is temporarily blocked by the serosity of above-mentioned diverting agent, completes each interval and execute after multistage repetition
Work；Finally make diverting agent dissolve with acidic leach medium, form passage, completion, open flow.
Specifically, the method includes: (1) drifting；(2) multistage fracturing completion；(3) acid fracturing dissolves；Wherein, step (2) is entered
One step ground includes:
(21) tool string is delivered to the first of the pit shaft that step (1) is formed by the way of cable transmission and fluid power propelling movement
At interval, carry out the first interval perforation；
(22) in the first interval of pit shaft, pump into fracturing fluid and carry out the first interval pressure break；
(23) with the serosity of above-mentioned diverting agent, the first interval fracturing fracture is temporarily blocked；
(24) precalculated position that will carry on tool string to the second interval, carries out the second interval perforation；
(25) second intervals are formed crack by pressure break under the effect of the first interval sealing agent；
(26) with the serosity of above-mentioned diverting agent, the second interval fracturing fracture is temporarily blocked；
(27) according to completion number of fragments, repetition step (24), to step (26), completes each layer after multistage repetition
Section construction；
Wherein, after pressure break terminates, do not carry out open flow.
Further, in described step (22), the first interval pressure break is light casing fracturing, after perforation completes, trips out remaining work
Tool string, injects fracturing fluid from sleeve pipe, carries out pressing crack construction.Step (2) also includes: (20) provide and include carrying liquid, degradable poly
The serosity of the diverting agent of ester fiber, proppant and linear colloid.
The method mainly applies the temporary stall of fiber dynamic steering fracturing technique and broadband to the know-why of fracturing technique.Its
In, fiber dynamic steering fracturing technique: use biodegradable fiber and conventional support agent material as the most stifled material, complete one-level
Post-fracturing turning to the stage, pump into the most stifled material (diversion agent), crack is blocked up temporarily by the most stifled diversion agent at nearly pit shaft, forces liquid pressure
Open new interval, thus reach to turn to the purpose transforming next layer.Main feature has: the most stifled diverting material is the most expensive, undulation degree
Material can be degradable, coordinates microseismic monitoring can adjust infusion scheme in real time, maximizes reservoir contact, be suitable for formation temperature
Up to 120 degrees Celsius.The temporary stall in broadband is to fracturing technique: after every one-level pressure break completes, by infusion biodegradable fiber
The multiple dimensioned degradable granule of auxiliary migration, carries out temporary closure to this grade of fracturing fracture mouth, thus when improving infusion
Bottom pressure, opens stress stratum higher, that originally do not transform, opens new seam, increase the complexity of Number of Fractures and crack.Temporarily
Stifled diverting material is biodegradable fiber and multiple dimensioned degradable polymer granule, after diverting agent granule injects stratum, and big particle diameter
Other materials is intercepted in porch, crack by granule, and small size particle effectively reduces sealing permeability and realizes temporarily closure simultaneously
Isolation.With the biodegradable fiber of diverting agent infusion simultaneously, then the granular materials in fracturing fluid is served and effectively support and stable
Effect, it is to avoid it scatter in tubing string, and can strengthen bridge blinding effect.Main feature: the most stifled material is reliable, uses less
Volume material i.e. can reach the most stifled effect, and material can be degradable under the conditions of bottom hole temperature (BHT), is suitable for bottom hole temperature (BHT) 60-177 and takes the photograph
Family name's degree.
The beneficial effect of the method for the embodiment of the present invention: 1. the most stifled diverting material is the most expensive；2. fibrous material can drop completely
Solve；3. use smaller size smaller material i.e. to can reach the most stifled effect；4. coordinate microseismic monitoring can adjust infusion scheme in real time,
Adjust single-stage to block up the time temporarily, maximize reservoir contact；5. it is suitable for formation temperature up to 60-177 degree Celsius.
Correspondingly, the embodiment of the present invention additionally provides corresponding with the method for above-mentioned multistage fracturing without bridging plug multistage without bridging plug
Fracturing device, refers to shown in Fig. 1 and Fig. 2, and it includes for the first assembly 10 to the first interval construction with for other
Interval carries out the second assembly 20 constructed.Wherein, the first assembly includes being concatenated by oil pipe 101 the first detent mechanism 102,
One igniter head the 103, first perforating gun 104 and fracturing fluid conveying mechanism 105.Cable 201 that second assembly 20 includes being sequentially connected with,
End the 202, second detent mechanism 203, second point duration and degree of heating the 204, second perforating gun 205 and diverting agent pumping mechanism 206.
Further, the second assembly 20 also includes that is located between end 202 and the second detent mechanism 203 increases the weight of mechanism
207, described diverting agent pumping mechanism 206 includes pressure detector 2061.
Diverting agent product embodiments
Embodiment 1: the diverting agent of the embodiment of the present invention includes: 90 weight portions carry liquid, the degradable poly of 2.0 weight portions
Ester fiber, the proppant of 30 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 10mm, carries liquid and includes: 0.2
～0.6 guanidine glue, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 weight of weight portion of weight portion of weight portion
The cleanup additive of part and the sodium carbonate of 0.1～0.5 weight portion.
Embodiment 2: the diverting agent of the embodiment of the present invention includes: 95 weight portions carry liquid, the degradable poly of 2.5 weight portions
Ester fiber, the proppant of 35 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 5mm, carry liquid and include: 0.2～
The guanidine glue of 0.6 weight portion, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 weight portion of weight portion of weight portion
Cleanup additive and the sodium carbonate of 0.1～0.5 weight portion.
Embodiment 3: the diverting agent of the embodiment of the present invention includes: 92 weight portions carry liquid, the degradable poly of 3.0 weight portions
Ester fiber, the proppant of 25 weight portions, the linear glue of 0.5 weight portion.Wherein, fibre length 5mm～10mm, carry liquid and include:
The guanidine glue of 0.2～0.6 weight portion, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 weight of weight portion of weight portion
The cleanup additive of amount part and the sodium carbonate of 0.1～0.5 weight portion.
Embodiment 4: the diverting agent of the embodiment of the present invention includes: 94 weight portions carry liquid, the degradable poly of 3.5 weight portions
Ester fiber, the proppant of 27 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 5mm, carry liquid and include: 0.2～
The guanidine glue of 0.6 weight portion, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 weight portion of weight portion of weight portion
Cleanup additive and the sodium carbonate of 0.1～0.5 weight portion.
Embodiment 5: the diverting agent of the embodiment of the present invention includes: 90 weight portions carry liquid, the degradable poly of 4.0 weight portions
Ester fiber, the proppant of 30 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 10mm, carries liquid and includes: 0.2
～0.6 guanidine glue, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 weight of weight portion of weight portion of weight portion
The cleanup additive of part and the sodium carbonate of 0.1～0.5 weight portion.
Comparative example 1: the diverting agent of this comparative example includes: 90 weight portions carry liquid, the degradable polyester of 1.0 weight portions is fine
Dimension, the proppant of 30 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 10mm, carries liquid and includes: 0.2～0.6
The guanidine glue of weight portion, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 the helping of weight portion of weight portion of weight portion
Row's agent and the sodium carbonate of 0.1～0.5 weight portion.
Comparative example 2: the diverting agent of this comparative example includes: 90 weight portions carry liquid, the degradable polyester of 1.5 weight portions is fine
Dimension, the proppant of 30 weight portions, the linear glue of 0.45 weight portion.Wherein, fibre length > 5mm, carries liquid and includes: 0.2～0.6
The guanidine glue of weight portion, 0.1～0.5 antibacterial, 0.3～0.7 viscous steady agent, 0.3～0.8 the helping of weight portion of weight portion of weight portion
Row's agent and the sodium carbonate of 0.1～0.5 weight portion.
The diverting agent of embodiment 1 to embodiment 5 is longer than comparative example 1 and comparative example 2 blocking time, and compressive resistance is big.
Process example
Embodiment 6:
Present embodiments provide and a kind of apply above-mentioned diverting agent to carry out the method without bridging plug multistage fracturing, including following enforcement
Step:
Step 1) drifting: utilize drift size gauge tool drifting to artificial bottom of a well, it is ensured that pit shaft is clean；
Step 2) first paragraph perforation, pressure break: utilize tubing transmission to carry out first paragraph perforation, trip out perforating gun, to first paragraph
Carry out light casing fracturing, pressure break not open flow, closing well；
Step 3) transfer perforation tool string: enter big orifice bridging plug, perforation tool string under wireline operation, after arriving 30 ° of hole deviations,
Ground with fracturing pump truck pumping perforation tool string to precalculated position；
Step 4) by infusion fiber/block up material temporarily, the first order/upper level pressure break sealing is carried out temporary closure；
Step 5) according to second segment perforated interval position, gradually go up portable cable, multistep ignition perforation；
Step 6) trip out perforation tool string；
Step 7) fracturing fibre block up temporarily material replace, force liquid to press off new interval, thus reach to transform next layer
Purpose, not open flow after pressure break is complete, it is ensured that horizontal segment remains without proppant；
8) step 3 is repeated)～7), remaining interval is descended successively perforation, the most stifled, pressure break, until completing whole interval pressure break
Operation；
Step 9) acid fracturing construction, after fibrous material dissolves, now pit shaft is connected with fracturing stratum；
Step 10) open flow, ask oil well yield, completion.
Application examples
The fracturing process without bridging plug of embodiments of the invention 6 some typical oil and gas reservoirs at home are had certain one-tenth by applicant
Merit experience, all has successful case at Sichuan-chongqing Region shale gas pressure break, three-hypers reservoir multistage fracturing and refracturing.
1, Z oil field shale gas project: this item body uses pumping bridging plug perforation connection to make multistage fracturing technology, flat in part
In platform/well, owing to casing deformation, perforation tool string are met under the fortuitous events such as card, perforation error, conventional pumping bridging plug perforation connection is made
When fracturing technology cannot be implemented, have employed fiber dynamic steering fracturing technique, success solves problem above at H5 and H6 platform,
Smoothly complete fracture job.Additionally, combine geology engineering specifications, for improving Overall Reconstruction effect and efficiency of construction, also use
Dynamic steering fracturing technique overcomes reservoir heterogeneity, reaches to improve perforation bunch and transforms the purpose contacted with reservoir.
2, the multistage fracturing project of T block " three high " reservoir: for T block " three high " sandstone reservoir (high temperature, ultra-deep, super
High pressure), use dynamic steering fracturing technique, eliminate completion isolating tool and use, be successfully made and execute without bridging plug multistage fracturing
Work, is contrasted by open-flow capacity average with K-region block, uses the Absolute Open Flow of Gas Wells of dynamic steering fracturing reform to improve 60%.
Fully demonstrate dynamic steering fracturing technique (temperature 170 degrees Celsius, reservoir buried depth 7000m, pressure coefficient under severe conditions
1.8) the suitability.
3, C oil field densification oil project: certain well is due to cementing quality extreme difference, under the mechanical dissection mode such as conventional bridging plug, inter-stage
Cementing concrete ring cannot ensure effectively to insulate, and have employed dynamic classification technique and carries out multistage transformation, successfully constructs, and test yield reaches
To offset well 1.5 times；Another well is big due to a certain reservoir thickness, grows especially every interlayer in layer, but with the stop interlayer of adjacent bed
Relatively thin, on the one hand mechanical classification difficulty and failure risk are big, and therefore the opposing party's surface layer internal classification difficulty uses temporary stall to technique
Carrying out dynamic classification and long section reservoir is effectively transformed, construction effect is notable.
The foregoing is only embodiments herein, not thereby limit the scope of the claims of the present invention, every utilize this Shen
Please the equivalent structure made of description and accompanying drawing content or equivalence flow process conversion, or be directly or indirectly used in other relevant skills
Art field, is the most in like manner included in the scope of patent protection of the application.
Claims (10)
1. a shale gas multistage fracturing diverting agent, it is characterised in that this diverting agent includes:
Carry liquid；
Biodegradable polyester fiber；
Proppant；With
Linear colloid.
Diverting agent the most according to claim 1, it is characterised in that described proppant selected from sand, bead, ceramic particle,
One or more in polymeric beads or hollow glass ball.
Diverting agent the most according to claim 1, it is characterised in that the length of described biodegradable polyester fiber is more than 5mm.
Diverting agent the most according to claim 1, it is characterised in that described in carry liquid and include:
The guanidine glue of 0.2～0.6 weight portion；
The antibacterial of 0.1～0.5 weight portion；
The viscous steady agent of 0.3～0.7 weight portion；
The cleanup additive of 0.3～0.8 weight portion；With
The sodium carbonate of 0.1～0.5 weight portion.
5. the method without bridging plug multistage fracturing, it is characterised in that the method pushes first by cable transmission and fluid power
Tool string is delivered to the first interval by mode, after carrying out perforation, pressure break, with the diverting agent described in any one of claim 1 to 5
First interval fracturing fracture is temporarily blocked by serosity；Secondly the second interval being carried out perforation, the second interval is at the first interval
Crack is formed by pressure break, with the serosity of the diverting agent described in any one of claim 1 to 5 to the second interval under the effect of sealing agent
Fracturing fracture temporarily blocks；Then next interval being carried out perforation, this interval is quilt under the effect of last layer section sealing agent
Pressure break forms crack, temporarily seals this interval fracturing fracture with the serosity of the diverting agent described in any one of claim 1 to 5
Stifled, after multistage repetition, complete the construction of each interval；Finally make diverting agent dissolve with acidic leach medium, form passage, complete
Well, open flow.
Method the most according to claim 5, it is characterised in that the method includes:
(1) drifting；
(2) multistage fracturing completion；
(3) acid fracturing dissolves；
Wherein, step (2) including:
(21) by the way of cable transmission and fluid power propelling movement, tool string is delivered to the first interval of the pit shaft that step (1) is formed
Place, carries out the first interval perforation；
(22) in the first interval of pit shaft, pump into fracturing fluid and carry out the first interval pressure break；
(23) with the serosity of the diverting agent described in any one of claim 1 to 5, the first interval fracturing fracture is temporarily blocked；
(24) precalculated position that will carry on tool string to the second interval, carries out the second interval perforation；
(25) second intervals are formed crack by pressure break under the effect of the first interval sealing agent；
(26) with the serosity of the diverting agent described in any one of claim 1 to 5, the second interval fracturing fracture is temporarily blocked；
(27) according to completion number of fragments, repetition step (24), to step (26), completes each interval after multistage repetition and executes
Work；
Wherein, after pressure break terminates, do not carry out open flow.
Method the most according to claim 6, it is characterised in that in described step (22), the first interval pressure break is light sleeve pipe pressure
Split, after perforation completes, trip out remaining tool string, inject fracturing fluid from sleeve pipe, carry out pressing crack construction.
Method the most according to claim 6, it is characterised in that described step (2) also includes: (20) provide and include carrying
The serosity of the diverting agent of liquid, biodegradable polyester fiber, proppant and linear colloid.
9. one kind without bridging plug multistage fracturing device, it is characterised in that include for the first assembly of the first interval construction and use
In the second assembly that other intervals are constructed, wherein,
First assembly includes that the first detent mechanism, first igniter head, the first perforating gun and the fracturing fluid that are concatenated by oil pipe are carried
Mechanism；
Cable that second assembly includes being sequentially connected with, end, the second detent mechanism, second point duration and degree of heating, the second perforating gun and temporarily
Blocking agent pumping mechanism.
The device of multistage fracturing without bridging plug the most according to claim 9, it is characterised in that described second assembly also includes setting
Increasing the weight of mechanism between end and the second detent mechanism, described diverting agent pumping mechanism includes pressure detector.
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