CN109826608A - A staged fracturing device - Google Patents
A staged fracturing device Download PDFInfo
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- CN109826608A CN109826608A CN201910274264.9A CN201910274264A CN109826608A CN 109826608 A CN109826608 A CN 109826608A CN 201910274264 A CN201910274264 A CN 201910274264A CN 109826608 A CN109826608 A CN 109826608A
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Abstract
本发明提供了一种分段压裂装置，涉及水平井分段压裂技术领域。该分段压裂装置包括密封杆和球头杆；所述密封杆的一个端面上设置有安装孔，所述球头杆插装在所述安装孔中；所述密封杆沿着自身轴向分隔为多个密封段；所述密封段设置有一条与其自身的外表面相连通的注液管线；所述球头杆上设置有入液管线，以及与所述入液管线连通的多条分液管线；多条所述分液管线能够与多条所述注液管线一一对应连通。本发明解决了现有技术中存在的压裂装置模拟分段压裂的结果不准确，且难以拆卸回收的技术问题。
The invention provides a staged fracturing device, which relates to the technical field of staged fracturing of horizontal wells. The staged fracturing device includes a sealing rod and a ball-end rod; an end surface of the sealing rod is provided with a mounting hole, and the ball-end rod is inserted into the mounting hole; the sealing rod is along its own axial direction It is divided into a plurality of sealing sections; the sealing section is provided with a liquid injection pipeline that communicates with its own outer surface; the ball head rod is provided with a liquid inlet pipeline, and a plurality of parts communicated with the liquid inlet pipeline. Liquid pipelines; a plurality of the liquid separation pipelines can be communicated with a plurality of the liquid injection pipelines in one-to-one correspondence. The invention solves the technical problems of inaccurate results of simulating staged fracturing of the fracturing device in the prior art, and it is difficult to disassemble and recover.
Description
Technical field
The present invention relates to horizontal well stage fracturing technology fields, more particularly, to a kind of segmented fracturing device.
Background technique
With the exploitation energetically of unconventional oil and gas such as shale oil gas, tight sand oil gas in recent years, horizontal well fracturing
As the key technology of low-permeability reservoir reconstruction, be conducive to form complicated seam net in reservoir, increase crack and oil-gas Layer
Contact area improves reservoir permeability, is therefore widely used in oil gas field production.Horizontal well fracturing refers to for water
The stratum of different location is segmented in horizontal well, by chemically or mechanically insulating between each section, then uses fracturing fluid pair
The technology of each section of difference pressure break.However, influencing each other between the crack that horizontal well fracturing is formed, fracture pattern is multiple
Miscellaneous, people are also extremely limited to the understanding of hydraulic fracture extension mechanism, are difficult to control finally formed seam net form state in production.
In labs horizontal well fracturing simulation test, the horizontal well in segments pressure under the effect of true reservoir stress is especially simulated
The test split, when test can real-time monitoring crack expansion process, crack geometric shape can be directly observed after test, is facilitated
Promote the regular understanding that interacts between fracture extension and crack, and then is live stratum depths staged fracturing technique optimization
Theoretical direction is provided.
Laboratory simulation fractured horizontal well is there are mainly two types of mode, one is drilling in square or cylindrical body rock sample,
Only aperture insulates, and fracturing fluid is injected into hole by the direct pressure break of entire hole section；Another kind is being tried dividual simulation pit shaft is prefabricated
In part, fracturing fluid is injected into pit shaft by fluid injection pipeline and realizes segmentation hydraulic fracturing, both modes all have serious skill
Art defect.The test operation of whole section of direct pressure break is simple, easy to accomplish, but not with the staged fracturing technique in actual production process
Symbol cannot simulate the complicated seam net form state and crack interaction mechanism of staged fracturing formation.Prefabricated pit shaft staged fracturing test
Test specimen used can only be artificial material test specimen, such as cement, gypsum, and the physical mechanics of artificial material and the natural rock sample of reservoir
Property difference is larger, especially as the reservoirs such as shale intrinsic fracture and horizontal bedding are developed, artificial material be it is uniform respectively to
The same sex, therefore test result is caused also to be difficult to reflect practical condition；In addition, using the side of glue envelope between casing and test specimen
Formula, casing are difficult to disassembly & recycling.
Based on this, the present invention provides a kind of segmented fracturing devices to solve above-mentioned technical problem.
Summary of the invention
The purpose of the present invention is to provide a kind of segmented fracturing devices, to solve fracturing device mould existing in the prior art
The technical issues of intending the result inaccuracy of staged fracturing, and being difficult to disassembly & recycling.
Based on above-mentioned purpose, the present invention provides a kind of segmented fracturing devices, including sealing bar and ball rod；
It is provided with mounting hole on one end face of the sealing bar, the ball rod is inserted into the mounting hole；
It is multiple seal sections that the sealing bar is axially spaced along itself；The seal section be provided with one with its own
The fluid injection pipeline that outer surface is connected；
Liquid-in pipe line, and a plurality of liquid separation pipeline being connected to the liquid-in pipe line are provided on the ball rod；It is a plurality of
The liquid separation pipeline can be connected to a plurality of fluid injection pipeline one-to-one correspondence.
Optionally, above-mentioned segmented fracturing device, the ball rod make at least one separating tube by way of rotation
Line is connected to the corresponding fluid injection pipeline.
Optionally, above-mentioned segmented fracturing device, the ball rod include bar portion and ball head；
One end of the bar portion is arranged in the ball head；
The inside of the bar portion is arranged in the liquid-in pipe line；The a plurality of liquid separation pipeline is arranged in the ball head
Portion.
Optionally, above-mentioned segmented fracturing device, the ball head include first sphere connecting with the bar portion；
First sphere is positioned close in first seal section of the bar portion；The centre of sphere of first sphere
It is coaxial with the rotary shaft of the bar portion；
The liquid-in pipe line extends to described first along the rotary shaft of the bar portion by the other end face of the bar portion
The centre of sphere of sphere；The a plurality of liquid separation pipeline is connected in the sphere center position of first sphere with the liquid-in pipe line, and respectively
By the outer wall for extending radially to first sphere of first sphere.
Optionally, above-mentioned segmented fracturing device, the ball head include the second sphere of multiple sequential connections；
Multiple second spheres are arranged in a one-to-one correspondence in multiple seal sections；The centre of sphere of multiple second spheres
It is coaxial with the rotary shaft of the bar portion；
The liquid-in pipe line is extended to along the rotary shaft of the bar portion far from described by the other end face of the bar portion
The centre of sphere of second sphere of bar portion；The a plurality of liquid separation pipeline respectively the sphere center position of corresponding second sphere with
The liquid-in pipe line connection, and respectively by the outer wall for extending radially to second sphere of second sphere.
Optionally, above-mentioned segmented fracturing device passes through sealing ring between the two neighboring seal section and seals.
Optionally, above-mentioned segmented fracturing device is provided with annular groove, the sealing ring between the two neighboring seal section
It is arranged in the annular groove.
Optionally, above-mentioned segmented fracturing device, the sealing ring are O-ring seal.
Optionally, the slot bottom of above-mentioned segmented fracturing device, the annular groove is provided with annular air channel；
The sealing bar inserts and is provided with air inlet on the end face of the ball rod；The air inlet and the annular air channel
Connection.
Optionally, above-mentioned segmented fracturing device further includes rotation driving lever；
One end of the bar portion is arranged in the ball head, and the other end of the bar portion is arranged in the rotation driving lever.
The segmented fracturing device provided by the invention, including sealing bar and ball rod；One end face of the sealing bar
On be provided with mounting hole, the ball rod is inserted into the mounting hole；It is multiple that the sealing bar is axially spaced along itself
Seal section；The seal section is provided with the fluid injection pipeline being connected with the outer surface of its own；It is arranged on the ball rod
There are liquid-in pipe line, and a plurality of liquid separation pipeline being connected to the liquid-in pipe line；The a plurality of liquid separation pipeline can be with a plurality of institute
It states fluid injection pipeline and corresponds connection.Existing staged fracturing equipment, independent pipeline architecture and seal form make equipment sheet
Body size is very big, and limiting them may be only available for the natural sillar of large-sized artificial test specimen or oprn-work.The present invention provides
Segmented fracturing device can simulate reservoir rock staged fracturing process under the conditions of true stratum, on the one hand it can be stored up using deep
The natural rock that layer drills through is as test specimen；On the other hand it is connect between test specimen using plug-in convenient for loading and unloading, experiment behaviour
Facilitate.
Based on this, the present invention has the result of simulation staged fracturing more acurrate compared with original technology, and being capable of disassembly & recycling
The advantages of.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the segmented fracturing device that the embodiment of the present invention one provides；
Fig. 2 is the cross-sectional view at segmented fracturing device A-A shown in FIG. 1；
Fig. 3 is the cross-sectional view at segmented fracturing device B-B shown in FIG. 1；
Fig. 4 is the cross-sectional view at segmented fracturing device C-C shown in FIG. 1；
Fig. 5 is the cross-sectional view at segmented fracturing device D-D shown in FIG. 1；
Fig. 6 is the cross-sectional view at segmented fracturing device E-E shown in FIG. 1；
The schematic diagram of sealing structure in the segmented fracturing device that Fig. 7 provides for the embodiment of the present invention one；
Fig. 8 is the scheme of installation for the segmented fracturing device that the embodiment of the present invention one provides；
Fig. 9 is the structural schematic diagram of segmented fracturing device provided by Embodiment 2 of the present invention；
Figure 10 is the cross-sectional view at segmented fracturing device A-A shown in Fig. 9；
Figure 11 is the cross-sectional view at segmented fracturing device B-B shown in Fig. 9；
Figure 12 is the cross-sectional view at segmented fracturing device C-C shown in Fig. 9；
Figure 13 is the cross-sectional view at segmented fracturing device D-D shown in Fig. 9；
Figure 14 is the scheme of installation of segmented fracturing device provided by Embodiment 2 of the present invention.
Icon: 100- sealing bar；101- fluid injection pipeline；102- sealing ring；103- annular groove；104- inlet；105- ring
Shape runner；200- ball rod；201- ball head；202- bar portion；203- liquid-in pipe line；204- liquid separation pipeline；300- rotates driving lever；
400- test specimen.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Existing staged fracturing equipment, their independent pipeline architectures and seal form make equipment size itself very big,
Limiting them may be only available for the natural sillar of large-sized artificial test specimen or oprn-work.Segmented fracturing device of the invention,
Compact-sized, pipeline, sealing element and apparatus main body are structure-integrated, therefore the staged fracturing experimental provision is limited without size, can
Required size is made into according to experimental design and does not influence its crush properties.Therefore, the present apparatus is not only suitable for oprn-work
The natural sillar of large scale or according to different materials proportion pour made of artificial specimen, be also applied for deep reservoir drilling obtain
Standard rock core test piece.
Embodiment one
Fig. 1 is the structural schematic diagram for the segmented fracturing device that the embodiment of the present invention one provides；Fig. 2 is segmentation shown in FIG. 1
Cross-sectional view at fracturing device A-A；Fig. 3 is the cross-sectional view at segmented fracturing device B-B shown in FIG. 1；Fig. 4 is shown in FIG. 1
Cross-sectional view at segmented fracturing device C-C；Fig. 5 is the cross-sectional view at segmented fracturing device D-D shown in FIG. 1；Fig. 6 is Fig. 1 institute
The cross-sectional view at segmented fracturing device E-E shown；Sealing structure in the segmented fracturing device that Fig. 7 provides for the embodiment of the present invention one
Schematic diagram；Fig. 8 is the scheme of installation for the segmented fracturing device that the embodiment of the present invention one provides.
As shown in Figure 1, providing a kind of segmented fracturing device in the present embodiment, the segmented fracturing device includes sealing
Bar 100 and ball rod 200；
Mounting hole is provided on one end face of the sealing bar 100, the ball rod 200 is inserted into the mounting hole
In；
It is multiple seal sections that the sealing bar 100 is axially spaced along itself；The seal section be provided with one with its from
The fluid injection pipeline 101 that the outer surface of body is connected；
Liquid-in pipe line 203, and a plurality of liquid separation being connected to the liquid-in pipe line 203 are provided on the ball rod 200
Pipeline 204；The a plurality of liquid separation pipeline 204 can be connected to a plurality of one-to-one correspondence of fluid injection pipeline 101.
Specifically, the fluid injection pipeline 101 being connected with the outer surface of its own is provided in each seal section,
The quantity of liquid separation pipeline 204 is equal with the quantity of fluid injection pipeline 101, and can correspond connection, when liquid separation pipeline 204 and note
When liquid pipe line 101 is connected to, fracturing fluid can be entered by the entrance of liquid-in pipe line 203, flow through liquid separation pipeline 204 and fluid injection pipeline
101, finally flowed out by the outer surface of place seal section.
The segmented fracturing device provided by the invention, sealing bar 100 in the shape of a rod can be directly inserted into test specimen 400
Or it is extracted from test specimen 400.Before experiment, above-mentioned segmented fracturing device is inserted into test specimen 400, since sealing bar 100 is divided
Multiple seal sections are divided into, the sealing node and 400 inner wall of test specimen at each seal section both ends are tightly connected, and form a fracturing section；
When needing to carry out pressure break to wherein one or more fracturing sections, ball rod 200 is operated, corresponding liquid separation pipeline 204 and fluid injection are made
Pipeline 101 is connected to, and fracturing fluid enters from liquid-in pipe line 203 carries out pressure break to test specimen 400；After experiment, above-mentioned staged fracturing is filled
It sets and is extracted from test specimen 400.
Based on this, the present invention has the result of simulation staged fracturing more acurrate compared with original technology, and being capable of disassembly & recycling
The advantages of.
As shown in Figures 1 to 6, in the optinal plan of the present embodiment, the ball rod 200 is made at least by way of rotation
One liquid separation pipeline 204 is connected to the corresponding fluid injection pipeline 101.
In the above-mentioned technical solutions, further, the ball rod 200 includes bar portion 202 and ball head 201；
One end of the bar portion 202 is arranged in the ball head 201；
The inside of the bar portion 202 is arranged in the liquid-in pipe line 203；The a plurality of liquid separation pipeline 204 is arranged described
The inside of ball head 201.
In the above-mentioned technical solutions, further, the ball head 201 include one connect with the bar portion 202 the
One sphere；
First sphere is positioned close in first seal section of the bar portion 202；First sphere
The centre of sphere is coaxial with the rotary shaft of the bar portion 202；
The liquid-in pipe line 203 is extended to by the other end face of the bar portion 202 along the rotary shaft of the bar portion 202
The centre of sphere of first sphere；Sphere center position and the liquid-in pipe line of a plurality of liquid separation pipeline 204 in first sphere
203 connections, and respectively by the outer wall for extending radially to first sphere of first sphere.
In the optinal plan of the present embodiment, sealed between the two neighboring seal section by sealing ring 102.
In the above-mentioned technical solutions, further, annular groove 103, institute are provided between two adjacent seal sections
Sealing ring 102 is stated to be arranged in the annular groove 103.
In the above-mentioned technical solutions, further, the slot bottom of the annular groove 103 is provided with annular channel 105；
The sealing bar 100 inserts and is provided with inlet 104 on the end face of the ball rod 200；The inlet 104 with
The annular channel 105 is connected to.
As shown in fig. 7, the present embodiment is by the way of pressurization, adjustable pressure is applied to sealing element, make its with
Test specimen 400 is in close contact, so that each fracturing section is sufficiently sealed, improves sealing effect.Sealed pressure is unloaded when installation and removal
It carries, staged fracturing equipment is made to be easy to load and unload.
It in the above-mentioned technical solutions, further, further include rotation driving lever 300；
One end of the bar portion 202 is arranged in the ball head 201, and the rotation driving lever 300 is arranged in the bar portion 202
The other end.
As shown in figure 8, using the segmented fracturing device in this example to the cylindrical standard shale of diameter 50mm, high 100mm
Rock core test piece 400 carry out staged fracturing method include:
1. test specimen is processed: the rock core that deep shale reservoir drills through is through cutting, polishing and dry post-processing at diameter 50mm, height
The standard specimen 400 of 100mm.The a certain end face of shale test specimen 400 is drilled out to the blind hole of predetermined diameter and depth with bench drill, i.e., it is blind
Diameter, depth and the segmented fracturing device size in hole match.It can be according to whether simulation perforation, chooses whether to drilling grooving.
For example, diameter of blind hole can be 10mm, depth can be 50mm, and matchingly, the diameter of segmented seal bar 100 also should be
10mm is slightly less than 10mm, and length is then slightly larger than 50mm, can be 55mm or 60mm.After drilling, if simulation perforation, needs
Annular grooving is carried out to drilling.Number, depth and the thickness of cut annular groove are chosen according to experimental design.For example, choosing
Pressure break number of segment is 5 sections, and the length of each fracturing section is 8mm, and 1 annular groove is arranged in middle part in each fracturing section, annular groove
Width and depth are 1mm.Cutting annular groove can be selected size and designs matched undercut slots knife progress.
2. being fitted into loading equipemtn: the test specimen 400 of completion of processing being toasted 24 hours in 105 DEG C of baking ovens, is packed into after cooling
Heat-shrinkable T bush.Later by the blind via bottom of segmented fracturing device insertion shale test specimen 400, and by segmented fracturing device and test specimen
400 are packed into external load equipment, to simulate staged fracturing process of the shale under earth formation deep stress.Cylinder specimen
400 external load equipment can be selected triaxial pressure cell structure and apply active stress, and the fixed test specimen 400 of fixture also can be selected and apply
By dynamic stress.By taking triaxial cell as an example, triaxial pressure cell structure is opened, segmented fracturing device and test specimen 400 are placed in examination
On 400 push-down head of part, and 400 seaming chuck of test specimen is partially loaded in heat-shrinkable T bush.Heat-shrinkable T bush is received by air-heater heating
Contracting, until each component is in close contact, hydraulic oil is obstructed by heat-shrinkable T bush, will not be immersed in test specimen 400.
3. preparing fracturing fluid: according to experimental design, preparing fracturing fluid according to certain proportion, and determine fracturing fluid correlation ginseng
Number, such as fracturing fluid temperature, viscosity, silt carrying capacity.The fracturing fluid completed will be prepared to be stored in receiver, in order to carry out segmentation pressure
Split test.
4. pressurization: opening sealing pressing pump, hydraulic oil reaches each annular channel of fracturing device from inlet 104
105, pressure is applied to sealing ring 102, is in close contact it with test specimen 400, to keep each fracturing section sufficiently sealed.Meanwhile it is close
Seal pressure can be adjusted according to the actual situation, and rock higher for breakthrough pressure can properly increase sealed pressure, in turn
Improve sealing effect.After pressurization, it can be tested by way of pre- pressure break to sealing effect.Checked operation is as follows, adjusts
Section rotation driving lever 300, is connected to fluid injection pipeline 101 at A-A with liquid-in pipe line 203 by liquid separation pipeline 204, other fracturing sections
Fluid injection pipeline 101 is not connected to liquid-in pipe line 203；Topping-up pump is opened, by fracturing section where fracturing fluid injection A-A, reaches certain
(notice that pressure cannot be too big, guarantee 400 integrality of test specimen, do not interfere to subsequent segment crushing test) after pressure and stops note
Liquid；Whether stable at any time pressure break hydraulic coupling is observed, to examine the leakproofness of this section；It similarly, can be to B-B, C-C, D-D, E-E
Place fracturing section is successively examined.
5. staged fracturing: before staged fracturing, according to test needs, design axis pressure, confining pressure, staged fracturing order, fluid injection row
Amount, liquid filling pressure etc..After step 4 pressurization success, the confining pressure pump of triaxial cell is opened, confining pressure is loaded extremely to test specimen 400
After target value, confining pressure valve is closed, axis press pump is then turned on, target value, and closing axle pressure valve is depressed into 400 loading axis of test specimen, it is complete
At the external load of test specimen 400.Then, 400 staged fracturing of test specimen is carried out, according to the staged fracturing order of design, adjusts rotation
Driving lever 300 is connected to the fluid injection pipeline 101 of the first fracturing section with liquid-in pipe line 203 by liquid separation pipeline 204, other fracturing sections
Fluid injection pipeline 101 be not connected to liquid-in pipe line 203.Topping-up pump is opened, is pumped into pressure according to the fluid injection discharge capacity of setting, liquid filling pressure
Split liquid.The pressure curve that can be detected according to segmented fracturing device judges pressure break degree, such as when 400 inside pressure break of test specimen is hydraulic
Power has bust, illustrates that test specimen 400 ruptures, this section of crushing test terminates.It, can also root if carrying other detection devices such as sound emission
According to acoustie emission event number etc., other experimental datas judge that crushing test carries out degree.The fracturing section after the test, closes fluid injection
Pump adjusts rotation driving lever 300, according to the segmentation of design carry out respectively second and third, the crushing tests of four fracturing sections, fracturing step
Ibid.
6. taking out test specimen: whole fracturing sections after the test, close topping-up pump, unload the axis pressure of triaxial cell and enclose
Pressure, and sealing pressing pump is closed, unload sealed pressure.Triaxial pressure cell structure is opened, test specimen 400 and staged fracturing dress are taken out
It sets.Due to having unloaded sealed pressure, segmented fracturing device can relatively easily be extracted to separation from test specimen 400, without
Apply biggish external force, avoids further destroying post-fracturing test specimen 400, influence the observation to pressure break result.
7. pressure break result viewing: in fracturing process, sound emission can be used and acquired in real time to crack data.Pressure break is completed
Afterwards, various ways test specimen 400 can be used to be observed.For example, it is each to 400 surface of test specimen with the mode of sketch to detect by an unaided eye
The form and quantity of fracturing section macrocrack are counted；Layer-by-layer linear array scanning can be carried out to test specimen 400 with industrial CT, seen
Examine the expanded configuration inside each fracturing section crack；It can be split with the micro character of 400 hydraulic fracture of SEM scanning test specimen and secondary
The developmental state of seam；After the whole observation of test specimen 400, also 400 subdivision of test specimen can be observed the hydraulic fracture of internal each fracturing section.
Embodiment two
Fig. 9 is the structural schematic diagram of segmented fracturing device provided by Embodiment 2 of the present invention；Figure 10 is segmentation shown in Fig. 9
Cross-sectional view at fracturing device A-A；Figure 11 is the cross-sectional view at segmented fracturing device B-B shown in Fig. 9；Figure 12 is shown in Fig. 9
Segmented fracturing device C-C at cross-sectional view；Figure 13 is the cross-sectional view at segmented fracturing device D-D shown in Fig. 9；Figure 14 is this
The scheme of installation for the segmented fracturing device that inventive embodiments two provide.
As shown in figure 9, providing a kind of segmented fracturing device in the present embodiment, the segmented fracturing device includes sealing
Bar 100 and ball rod 200；
Mounting hole is provided on one end face of the sealing bar 100, the ball rod 200 is inserted into the mounting hole
In；
It is multiple seal sections that the sealing bar 100 is axially spaced along itself；The seal section be provided with one with its from
The fluid injection pipeline 101 that the outer surface of body is connected；
Liquid-in pipe line 203, and a plurality of liquid separation being connected to the liquid-in pipe line 203 are provided on the ball rod 200
Pipeline 204；The a plurality of liquid separation pipeline 204 can be connected to a plurality of one-to-one correspondence of fluid injection pipeline 101.
Specifically, the fluid injection pipeline 101 being connected with the outer surface of its own is provided in each seal section,
The quantity of liquid separation pipeline 204 is equal with the quantity of fluid injection pipeline 101, and can correspond connection, when liquid separation pipeline 204 and note
When liquid pipe line 101 is connected to, fracturing fluid can be entered by the entrance of liquid-in pipe line 203, flow through liquid separation pipeline 204 and fluid injection pipeline
101, finally flowed out by the outer surface of place seal section.
As shown in Fig. 9 to Figure 13, in the optinal plan of the present embodiment, the ball rod 200 made by way of rotation to
A few liquid separation pipeline 204 is connected to the corresponding fluid injection pipeline 101.
In the above-mentioned technical solutions, further, the ball rod 200 includes bar portion 202 and ball head 201；
One end of the bar portion 202 is arranged in the ball head 201；
The inside of the bar portion 202 is arranged in the liquid-in pipe line 203；The a plurality of liquid separation pipeline 204 is arranged described
The inside of ball head 201.
In the above-mentioned technical solutions, further, the ball head 201 includes the second sphere of multiple sequential connections；
Multiple second spheres are arranged in a one-to-one correspondence in multiple seal sections；The centre of sphere of multiple second spheres
It is coaxial with the rotary shaft of the bar portion 202；
The liquid-in pipe line 203 is extended to by the other end face of the bar portion 202 along the rotary shaft of the bar portion 202
The centre of sphere of second sphere far from the bar portion 202；The a plurality of liquid separation pipeline 204 is respectively in corresponding second ball
The sphere center position of body is connected to the liquid-in pipe line 203, and extends radially to second ball by second sphere respectively
The outer wall of body.
In the present embodiment, it can be sealed using O-ring seal 102 between two neighboring seal section, can also be used
Pressuring method is sealed, and the structure being sealed using pressuring method is referring specifically to sealing structure described in embodiment one.
It in the above-mentioned technical solutions, further, further include rotation driving lever 300；
One end of the bar portion 202 is arranged in the ball head 201, and the rotation driving lever 300 is arranged in the bar portion 202
The other end.
As shown in figure 14, the present embodiment with the cylindrical standard shale core test specimen 400 to diameter 50mm, high 100mm into
For row staged fracturing, specifically comprise the following steps:
1. test specimen is processed: the shale core drilled through from deep reservoir being cut, is polished into the circle of diameter 50mm, high 100mm
Cylindricality standard specimen 400.A diameter 10mm is bored in 400 end face center of test specimen, depth is the hole of 400 mid-height of test specimen, is used
In installation staged fracturing equipment.According to test needs, can also annular groove be cut to drilling subsection, for simulating perforation.
2. being packed into loading equipemtn: segmented fracturing device being placed in normal triaxial pressure chamber base, test specimen 400 is embedded into
In push-down head, rotation driving lever 300 is exposed by pressure chamber base preformed hole.By the test specimen 400 of completion of processing in 105 DEG C of baking ovens
Baking 24 hours is packed into heat-shrinkable T bush after cooling.Then the test specimen 400 with heat-shrinkable T bush is mounted on segmented fracturing device
On, it is contacted at the top of foot of hole and segmented seal bar 100, borehole sidewall is fitted closely with 100 surrounding of segmented seal bar.By test specimen
400 seaming chucks and 400 push-down head of test specimen are embedded into heat-shrinkable T bush.Heat-shrinkable T bush is shunk by air-heater heating, makes each group
It is in close contact between part, completely cuts off hydraulic oil.
3. preparing fracturing fluid: design fracturing fluid relevant parameter as needed will prepare the fracturing fluid completed and be stored in receiver
In, and connect topping-up pump with liquid-in pipe line 203 with liquid injection pipe.
4. staged fracturing: opening ordinary triaxial test machine, apply confining pressure to test specimen 400 and axis is depressed into target value, complete examination
The external load of part 400, to simulate reservoir rock reservoir stress.Adjust rotation driving lever 300 makes according to the pressure break order of design
The fluid injection pipeline 101 of first fracturing section is connected to by liquid separation pipeline 204 with liquid-in pipe line 203, the fluid injection pipeline of other fracturing sections
101 are not connected to liquid-in pipe line 203.Topping-up pump is opened, is pumped into fracturing fluid according to the fluid injection discharge capacity of setting, liquid filling pressure.Work as pressure
Hydraulic coupling bust is split, illustrates that test specimen 400 ruptures, this section of crushing test terminates.The fracturing section after the test, closes topping-up pump,
Rotation driving lever 300 is adjusted, carries out the crushing test of remaining fracturing section respectively according to the pressure break order of design, fracturing step is same as above.
5. taking out test specimen: whole fracturing sections after the test, close topping-up pump, and unloading ordinary triaxial test machine load is enclosed
Pressure and axis pressure, test specimen 400 is taken out from pressure chamber.
6. pressure break result viewing: portable electron microscope, SEM, three-dimensional laser scanner etc. can be used to 400 table of test specimen
The observation of face hydraulic fracture；Industry CT, sound emission etc. can be used to 400 inside waterpower gap observation of test specimen.
Embodiment three
The present embodiment uses the segmented fracturing device in embodiment two, to 300mm × 300mm × 300mm large scale
Cube shale carries out staged fracturing, specifically comprises the following steps:
1. test specimen is processed: the natural sillar of large scale can not be directly obtained from deep reservoir, can be in the same class of oprn-work
The rock material of type, physical and mechanical property are close with reservoir rock.The bulk shale large scale saw blade rock obtained will be excavated
Stone cutting machine is first cut into 300mm × 300mm × 300mm bulk, then the corner for test specimen 400 of polishing keeps its smooth to be adapted to very
Three-axis tester cabin.According to test needs, can also annular groove be cut to drilling subsection, for simulating perforation.
2. being packed into loading equipemtn: segmented fracturing device a part is embedded into a certain piece of load plate of true triaxial test machine
Portion.It after shale test specimen 400 is dry, is mounted on segmented fracturing device, is contacted at the top of foot of hole and segmented seal bar 100, bore
Hole side wall is fitted closely with 100 surrounding of segmented seal bar.Load plate is placed around entire test specimen 400, and testing machine three-dimensional axle power can
To pass to load plate by oil cylinder, then test specimen 400 is passed to, guarantees 400 stress equalization of test specimen.Also mountable sound in load plate
Transmitting probe, to obtain the crack propagation data in fracturing process.Finally, closing true triaxial test machine cabin.
3. preparing fracturing fluid: design fracturing fluid relevant parameter as needed will prepare the fracturing fluid completed and be stored in receiver
In, and connect topping-up pump with liquid-in pipe line 203 with liquid injection pipe.
4. staged fracturing: opening true triaxial test machine, apply three-dimensional confining pressure to target value to test specimen 400.Rotation is adjusted to dial
Bar 300 makes the fluid injection pipeline 101 of the first fracturing section pass through liquid separation pipeline 204 and liquid-in pipe line according to the pressure break order of design
203 connections, the fluid injection pipeline 101 of other fracturing sections are not connected to liquid-in pipe line 203.Topping-up pump is opened, according to the fluid injection of setting
Discharge capacity, liquid filling pressure are pumped into fracturing fluid.When fracturing fluid abrupt pressure reduction, illustrate that test specimen 400 ruptures, this section of crushing test terminates.It should
Fracturing section after the test, closes topping-up pump, adjusts rotation driving lever 300, carries out its overbottom pressure respectively according to the pressure break order of design
The crushing test of section is split, fracturing step is same as above.
5. taking out test specimen: whole fracturing sections after the test, close topping-up pump, unload true triaxial test machine confining pressure, will try
Part 400 takes out from pressure chamber.
6. pressure break result viewing: portable electron microscope, SEM, three-dimensional laser scanner etc. can be used to 400 table of test specimen
The observation of face hydraulic fracture；Industry CT, sound emission etc. can be used to 400 inside waterpower gap observation of test specimen.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of segmented fracturing device, which is characterized in that including sealing bar and ball rod；
It is provided with mounting hole on one end face of the sealing bar, the ball rod is inserted into the mounting hole；
It is multiple seal sections that the sealing bar is axially spaced along itself；The seal section is provided with the appearance with its own
The fluid injection pipeline that face is connected；
Liquid-in pipe line, and a plurality of liquid separation pipeline being connected to the liquid-in pipe line are provided on the ball rod；It is a plurality of described
Liquid separation pipeline can be connected to a plurality of fluid injection pipeline one-to-one correspondence.
2. segmented fracturing device according to claim 1, which is characterized in that the ball rod made by way of rotation to
A few liquid separation pipeline is connected to the corresponding fluid injection pipeline.
3. segmented fracturing device according to claim 2, which is characterized in that the ball rod includes bar portion and ball head；
One end of the bar portion is arranged in the ball head；
The inside of the bar portion is arranged in the liquid-in pipe line；The inside of the ball head is arranged in a plurality of liquid separation pipeline.
4. segmented fracturing device according to claim 3, which is characterized in that the ball head includes one and the bar portion
First sphere of connection；
First sphere is positioned close in first seal section of the bar portion；The centre of sphere of first sphere and institute
The rotary shaft for stating bar portion is coaxial；
The liquid-in pipe line extends to first sphere along the rotary shaft of the bar portion by the other end face of the bar portion
The centre of sphere；The a plurality of liquid separation pipeline is connected in the sphere center position of first sphere with the liquid-in pipe line, and respectively by institute
State the outer wall for extending radially to first sphere of the first sphere.
5. segmented fracturing device according to claim 3, which is characterized in that the ball head includes multiple sequential connections
Second sphere；
Multiple second spheres are arranged in a one-to-one correspondence in multiple seal sections；The centre of sphere of multiple second spheres with
The rotary shaft of the bar portion is coaxial；
The liquid-in pipe line is extended to along the rotary shaft of the bar portion far from the bar portion by the other end face of the bar portion
Second sphere the centre of sphere；The a plurality of liquid separation pipeline respectively the sphere center position of corresponding second sphere with it is described
The connection of liquid-in pipe line, and respectively by the outer wall for extending radially to second sphere of second sphere.
6. segmented fracturing device according to claim 4 or 5, which is characterized in that lead between the two neighboring seal section
Cross sealing ring sealing.
7. segmented fracturing device according to claim 6, which is characterized in that be provided between the two neighboring seal section
Annular groove, the sealing ring are arranged in the annular groove.
8. segmented fracturing device according to claim 7, which is characterized in that the sealing ring is O-ring seal.
9. segmented fracturing device according to claim 7, which is characterized in that the slot bottom of the annular groove is provided with annular gas
Road；
The sealing bar inserts and is provided with air inlet on the end face of the ball rod；The air inlet and the annular air channel connect
It is logical.
10. segmented fracturing device according to claim 3, which is characterized in that further include rotation driving lever；
One end of the bar portion is arranged in the ball head, and the other end of the bar portion is arranged in the rotation driving lever.
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