CN109184654A - Crack mode of extension recognition methods and device - Google Patents
Crack mode of extension recognition methods and device Download PDFInfo
- Publication number
- CN109184654A CN109184654A CN201811202748.4A CN201811202748A CN109184654A CN 109184654 A CN109184654 A CN 109184654A CN 201811202748 A CN201811202748 A CN 201811202748A CN 109184654 A CN109184654 A CN 109184654A
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- man
- made fracture
- fracturing fluid
- pressure
- crushed zone
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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
- 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
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
A kind of crack mode of extension recognition methods provided by the invention and device, method includes: that fracturing fluid is injected into fracturing string, stratum is ruptured so that the fracturing fluid can enter stratum by preforation tunnel, and form man-made fracture, wherein, the preforation tunnel is set on the fracturing string, and is provided with pressure sensor at the preforation tunnel；Continue to inject the fracturing fluid into the fracturing string, so that the man-made fracture can extend forward；And the first current pressure curve of the fracturing fluid is obtained by the pressure sensor；According to extensions path of the man-made fracture around crushed zone described in the first current pressure curve acquisition.The application embodiment provides a kind of crack mode of extension recognition methods and device, can identify mode of extension of man-made fracture when by around crushed zone.
Description
Technical field
The present invention relates to technical field of petrochemical industry more particularly to a kind of crack mode of extension recognition methods and devices.
Background technique
The crack horizontally or vertically that fracturing fluid presses off stratum when man-made fracture, that is, pressure break.
When stratum memory is in crushed zone, man-made fracture extends forward that there may be following three types of mode of extensions:
First, man-made fracture can continue straight line extension along the propagation direction of prediction when by around crushed zone；Second, man-made fracture exists
The propagation direction for deviateing prediction when by around crushed zone bends extension；Third, man-made fracture is by around crushed zone
When deviate prediction propagation direction close to and pass through the zone of fracture.But there are no can identify that man-made fracture passing through in the prior art
The method of mode of extension when crossing around crushed zone.Therefore the diversity of these mode of extensions increases pressure break reservoir reconstruction effect
Uncertainty.
Summary of the invention
In view of this, the application embodiment provides a kind of crack mode of extension recognition methods and device, can know
Mode of extension of other man-made fracture when by around crushed zone.
Following technical proposal can be used to realize in above-mentioned purpose of the invention: a kind of crack mode of extension recognition methods, packet
It includes: injecting fracturing fluid into fracturing string, rupture stratum so that the fracturing fluid can enter stratum by preforation tunnel,
And form man-made fracture, wherein the preforation tunnel is set on the fracturing string, and pressure is provided at the preforation tunnel
Force snesor；Continue to inject the fracturing fluid into the fracturing string, so that the man-made fracture can extend forward；Pass through institute
State the first current pressure curve that pressure sensor obtains the fracturing fluid of the man-made fracture forward in expansion process；According to
Extensions path of the man-made fracture around crushed zone described in the first current pressure curve acquisition.
As a preferred embodiment, if the first current pressure curve is the straight line to remain basically stable, it is described
Man-made fracture extends forward around the crushed zone along first direction, wherein the first direction is that the man-made fracture exists
The extending direction when stratum ruptures.
As a preferred embodiment, if the first current pressure curve includes that first to remain basically stable extends
Section, arc-shaped variation the first segmental arc, and the second extended segment remained basically stable, wherein one end of first segmental arc
It is connected with first extended segment, the other end of first segmental arc is connected with one end of second extended segment, then described
Man-made fracture deviates first direction around the crushed zone and extends forward, wherein the first direction is the man-made fracture
Extending direction when the stratum ruptures.
As a preferred embodiment, if the first current pressure curve further includes the second arc of arc-shaped variation
Shape section and the third extended segment remained basically stable, wherein the other end of one end of second segmental arc and second extended segment
It is connected, the other end of second segmental arc is connected with the third extended segment, and the third extended segment is prolonged with described first
It is conllinear to stretch section, then the man-made fracture has bypassed the crushed zone during deviateing first direction and extending forward, and around
Continuation extends forward along the first direction after crossing the crushed zone.
As a preferred embodiment, if the first current pressure curve further includes extending linearly for abrupt pressure reduction
Section, wherein described one end for extending linearly section is connected with the other end of second extended segment, then the man-made fracture is deviateing
First direction is connected after extending forward with the crushed zone.
As a preferred embodiment, if the first current pressure curve further includes at least one set by unlifting pressure
The pressure oscillation section of section and falling pressure section composition, wherein one end of the pressure oscillation section extends linearly the another of section with described
One end is connected, then the man-made fracture passes through out of described crushed zone after being connected with the crushed zone.
As a preferred embodiment, if the first current pressure curve further includes that the 4th to remain basically stable extends
Section, wherein the 4th extended segment is connected with the other end of the pressure oscillation section, and the 4th extended segment and described the
One extended segment is conllinear, then the man-made fracture extends forward after through the crushed zone along first direction.
As a preferred embodiment, the preforation tunnel is located at the side of the fracturing string.
As a preferred embodiment, the charge velocity of the fracturing fluid is greater than the stratum to the fracturing fluid
Absorption rate.
A kind of crack mode of extension identification device comprising: pressure break module；The pressure break module is used for into fracturing string
Fracturing fluid is injected, ruptures stratum so that the fracturing fluid can enter stratum by preforation tunnel, and form man-made fracture,
Wherein, the preforation tunnel is set on the fracturing string, and is provided with pressure sensor at the preforation tunnel；Lasting note
Enter module, the injection module that continues is used to continue to inject the fracturing fluid into the fracturing string, so that described manually split
Seam can extend forward；First obtains module, and described first obtains module for described artificial by pressure sensor acquisition
First current pressure curve of the crack fracturing fluid in expansion process forward；Second obtains module, and described second obtains mould
Block is used for extensions path of the man-made fracture around crushed zone according to the first current pressure curve acquisition.
Mode of extension recognition methods in crack provided by the present application and device beneficial effect are: the crack of the application embodiment
Mode of extension recognition methods and device obtain man-made fracture around crushed zone by the first current pressure curve of fracturing fluid
Extensions path.Since crushed zone can have some impact on the stress field of its surrounding formation, and when the crustal stress on stratum
When size changes, the direction of the crustal stress on stratum can also occur to change accordingly.So when man-made fracture extend to it is broken
When band surrounding, the extending pressure of man-made fracture will change, and the pressure of fracturing fluid can also occur to change accordingly, Jin Erke
To judge the variation of man-made fracture propagation direction according to the pressure change of fracturing fluid.And then man-made fracture is obtained in crushed zone week
The extensions path enclosed.Therefore, the application embodiment provides a kind of crack mode of extension recognition methods and device, can know
Mode of extension of other man-made fracture when by around crushed zone.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the schematic diagram for the crack mode of extension that one embodiment of the present invention provides；
Fig. 2 is the pressure curve schematic diagram for the first extensions path that one embodiment of the present invention provides；
Fig. 3 is the pressure curve schematic diagram for the second extensions path that one embodiment of the present invention provides；
Fig. 4 is the pressure curve schematic diagram for the third extensions path that one embodiment of the present invention provides；
Fig. 5 is the flow chart for the crack mode of extension recognition methods that one embodiment of the present invention provides；
Fig. 6 is the schematic diagram for the crack mode of extension identification device that one embodiment of the present invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1, Fig. 5.The crack mode of extension recognition methods that a kind of embodiment of the application provides, can wrap
Include: step S11: injecting fracturing fluid into fracturing string 12, so that the fracturing fluid, which can enter stratum by preforation tunnel, makes ground
Layer ruptures, and forms man-made fracture 13, wherein the preforation tunnel is set on the fracturing string 12, and described is penetrated
Pressure sensor is provided at the eyelet of hole；Step S13: continue to inject the fracturing fluid into the fracturing string 12, so that institute
Stating man-made fracture can extend forward；And the first current pressure curve of the fracturing fluid is obtained by the pressure sensor；Step
Rapid S15: according to extensions path of the man-made fracture 13 around crushed zone 15 described in the first current pressure curve acquisition.
As can be seen from the above technical solutions: the crack mode of extension recognition methods of the application embodiment passes through fracturing fluid
The first current pressure curve obtain extensions path of the man-made fracture 13 around crushed zone 15.Since crushed zone 15 can be to it
The stress field of surrounding formation has some impact on, and when the size of the crustal stress on stratum changes, the crustal stress on stratum
Direction can also occur to change accordingly.So man-made fracture 13 prolongs when man-made fracture 13 extends to 15 surrounding of crushed zone
Stretching pressure will change, and the pressure of fracturing fluid can also occur to change accordingly, and then can be become according to the pressure of fracturing fluid
Change the variation to judge 13 propagation direction of man-made fracture.And then obtain extensions path of the man-made fracture 13 around crushed zone 15.
As shown in Figure 1, in the present embodiment, step S11: injecting fracturing fluid into fracturing string 12, so that fracturing fluid
Stratum can be entered by preforation tunnel ruptures stratum, and forms man-made fracture 13, wherein preforation tunnel is set to pressure break
On tubing string 12, and pressure sensor is provided at preforation tunnel.Specifically, the unilateral side first to the fracturing string 12 in pit shaft 11
Carry out perforation.Since hydraulic fracturing is usually vertical man-made fracture 13 in the man-made fracture 13 that stratum depths is formed, to pit shaft 11
Interior fracturing string 12 is unilateral to carry out perforation, only pressure break can be carried out to the unilateral stratum of pit shaft 11, to avoid conventional hydraulic pressure break
The problem for causing fracturing fluid construction curve more complicated 11 surrounding two sides of pit shaft or more side stratum concurrent fracturing in the process, into
And it can be realized the precise measurement to single 13 first current pressure curve of man-made fracture.Namely preforation tunnel is located at fracturing string
12 side.Then, fracturing fluid is filled into fracturing string 12, and fixed displacement injects fracturing fluid, fracturing fluid has suppressed height in shaft bottom
Pressure, to make 11 adjacent earth formations of pit shaft first rupture by preforation tunnel, to form man-made fracture 13.Further, it is
Fracturing fluid is avoided to be absorbed by stratum, the charge velocity of fracturing fluid is greater than stratum to the absorption rate of fracturing fluid.And fracturing fluid
Rate cannot be excessive, to avoid fracturing fluid charge velocity it is excessive cause man-made fracture 13 extend it is too fast to in stratum be crushed
Accurate measurement with 15 surrounding man-made fracture, 13 extending pressure impacts.It further, as shown in Figure 2, Figure 3, Figure 4, can be with
Fracturing fluid is being injected into fracturing string 12, is rupturing stratum so that fracturing fluid can enter stratum by preforation tunnel, and
The second current pressure curve of fracturing fluid is obtained during forming man-made fracture 13 by pressure sensor.Specifically, to
Fracturing fluid is filled in fracturing string 12, and fixed displacement injects fracturing fluid, fracturing fluid is during high pressure has been suppressed in shaft bottom, fracturing fluid
Pressure be constantly in propradation, when the pressure of fracturing fluid be higher than formation fracture pressure when, stratum ruptures, fracturing fluid wink
Between largely flow into man-made fracture 13 so that the pressure of fracturing fluid declines suddenly, in second current pressure curve such as Fig. 2
OA sections；OD section in Fig. 3；OQ section in Fig. 2.
Step S13: continue to inject fracturing fluid into fracturing string 12, so that man-made fracture 13 can extend forward；And pass through
First current pressure curve of pressure sensor acquisition fracturing fluid.Specifically, continue fixed displacement and inject fracturing fluid, so that manually
Crack 13 can extend forward, when man-made fracture 13 extends to 15 surrounding of crushed zone, since the ground of 15 surrounding formation of crushed zone is answered
The big size and Orientation of power may change, and the extending pressure size of man-made fracture 13 also changes accordingly, therefore artificial
During crack 13 extends forward, the pressure size of fracturing fluid can also change.Further, pass through the first current pressure
Force curve understand man-made fracture 13 forward in expansion process fracturing fluid pressure change.
Step S15: according to extensions path of the first current pressure curve acquisition man-made fracture 13 around crushed zone 15.
Specifically, there are 3 kinds of extensions paths around crushed zone 15 for man-made fracture 13: as shown in Fig. 2, extending road first
In diameter 29, the first current pressure curve is the straight line to remain basically stable.Man-made fracture 13 around crushed zone 15 along first direction to
Preceding extension, wherein first direction is extending direction of the man-made fracture 13 when stratum ruptures.As shown in Fig. 2, AB sections are people
First current pressure curve of the fracturing fluid in expansion process forward of work crack 13.Due to being extended forward in man-made fracture 13 but also
Before not encountering the zone of fracture, the pressure of fracturing fluid is constantly in stable state, at this time the first current pressure curve of fracturing fluid
For the straight line to remain basically stable.Man-made fracture 13 develops along the extending direction when stratum ruptures.So when the first current pressure
During the entire process of force curve man-made fracture 13 extends forward, i.e., man-made fracture 13 is encountered to be still within after the zone of fracture and be held substantially
Flat state then illustrates that 13 extending pressure of man-made fracture is substantially unchanged around crushed zone 15, further illustrates crushed zone 15
Around stratum stress field it is substantially unchanged, crushed zone 15 on the extension of man-made fracture 13 substantially without influence, so manually splitting
Seam 13 extends forward around crushed zone 15 along first direction.
As shown in figure 3, first current pressure curve includes the first extended segment remained basically stable in the second extensions path 31
17, the first segmental arc 21 of arc-shaped variation, and the second extended segment 19 remained basically stable, wherein the one of the first segmental arc 21
End is connected with the first extended segment 17, and the other end of the first segmental arc 21 is connected with one end of the second extended segment 19, man-made fracture 13
Deviate first direction around crushed zone 15 to extend forward, wherein first direction is man-made fracture 13 when stratum ruptures
Extending direction.As shown in figure 3, VE sections of the first current pressures for the fracturing fluid in man-made fracture 13 forward expansion process are bent
Line.When the pressure of fracturing fluid is in the first extended segment 17, illustrating extending pressure, there is no variations；Man-made fracture 13 is along first
Direction advances.When the pressure of fracturing fluid is in the first segmental arc 21, illustrate that extending pressure occurs around crushed zone 15
Variation further illustrates that the stratum stress field around crushed zone 15 changes, extension of the crushed zone 15 to man-made fracture 13
Certain influence is produced, so that the propagation direction of man-made fracture 13 is changed, i.e. deviation first direction advances.
As shown in figure 3, further, in the second extensions path 31, the first current pressure curve further includes arc-shaped change
Second changed segmental arc 23 and the third extended segment 25 remained basically stable, wherein one end and the second extended segment of the second segmental arc 23
19 other end is connected, and the other end of the second segmental arc 23 is connected with third extended segment 25, and third extended segment 25 is prolonged with first
It is conllinear to stretch section 17, man-made fracture 13 has bypassed crushed zone 15, and around broken during deviation first direction extends forward
Continue to extend forward along first direction after broken band 15.When the pressure of fracturing fluid is in the second extended segment 19, illustrate to extend pressure
Power is substantially unchanged, that is, showing strata pressure, there is no variations, therefore i.e. the deviation of man-made fracture 13 first direction advances
During, do not pass through crushed zone 15.When the pressure of fracturing fluid reaches the by the second segmental arc 23 from the second extended segment 19
When three extended segments 25, illustrate that extending pressure changes around crushed zone 15, further illustrates the stratum around crushed zone 15
Stress field changes, and crushed zone 15 produces certain influence to the extension of man-made fracture 13, so that man-made fracture 13 exists
Deviate after first direction advances and is returned on the first extending direction.Therefore, illustrate in this kind of path, crushed zone 15 is right
The stress field on stratum has a degree of interference, and man-made fracture 13 turns to when by around crushed zone 15, and not
As for crushed zone 15 is passed through, of short duration variation, passes through interference when the first current pressure curve can be around process crushed zone 15 at this time
Restore behind area normal.
As shown in figure 4, first current pressure curve includes the first extended segment remained basically stable in third extensions path 33
17, the first segmental arc 21 and abrupt pressure reduction of arc-shaped variation extend linearly section 29, wherein the one of the first segmental arc 21
End is connected with the first extended segment 17, and the other end of the first segmental arc 21 is connected with the one end for extending linearly section 29, then man-made fracture
13 around crushed zone 15 deviate first direction extends forward, and man-made fracture 13 after deviateing first direction with 15 phase of crushed zone
Connection, wherein first direction is extending direction of the man-made fracture 13 when stratum ruptures.As shown in figure 4, QN sections are artificial
First current pressure curve of the fracturing fluid in expansion process forward of crack 13.Since bust occurs for pressure, illustrate pressure break liquid stream
The natural man-made fracture 13 in 15 region of crushed zone is entered, therefore, man-made fracture 13 is connected with crushed zone 15.
As shown in figure 4, further, in third extensions path 33, the first current pressure curve further includes at least one set
The pressure oscillation section 31 being made of unlifting pressure section 33 and falling pressure section 35, wherein one end of pressure oscillation section 31 and linear
The other end of extended segment 29 is connected, then man-made fracture 13 passes through out of crushed zone 15 after being connected with crushed zone 15.Due to people
When by crushed zone 15, fracturing fluid is largely flowed such as the intrinsic fracture in crushed zone 15, the first current pressure curve in work crack 13
It can decline suddenly, it is possible to thus judge man-made fracture 13 whether by crushed zone 15.Specifically, at the pressure of fracturing fluid
When in pressure oscillation section 31, illustrate that fracturing fluid constantly flows into the intrinsic fracture in 15 region of crushed zone, therefore, man-made fracture
13 constantly link up intrinsic fracture, illustrate that man-made fracture 13 passes through out of crushed zone 15 after being connected with crushed zone 15.
As shown in figure 4, further, in third extensions path 33, the first current pressure curve further includes remaining basically stable
The 4th extended segment 27, wherein the 4th extended segment 27 is connected with the other end of pressure oscillation section 31, and the 4th extended segment 27 with
First extended segment 17 is conllinear, then man-made fracture 13 extends forward after through crushed zone 15 along first direction.When the pressure of fracturing fluid
When power reaches four extended segments 27 from pressure oscillation section 31, illustrate to restore normal after man-made fracture 13 has passed through crushed zone 15.
As shown in Fig. 1, Fig. 6, in the present embodiment, the crack mode of extension identification that a kind of embodiment of the application provides
Device may include: pressure break module 50；The pressure break module 50 is for injecting fracturing fluid into fracturing string 12, so that institute
Stating fracturing fluid and capable of entering stratum by preforation tunnel ruptures stratum, and forms man-made fracture, wherein the preforation tunnel
It is set on the fracturing string 12, and be provided with pressure sensor at the preforation tunnel；First obtains module 52, and described the
One acquisition module 52 injects the fracturing fluid into the fracturing string 12 for continuing, so that the man-made fracture can expand forward
Exhibition；And the first current pressure curve of the fracturing fluid is obtained by the pressure sensor；Second obtains module 54, and described the
Two, which obtain module 54, is used for extension road of the man-made fracture according to the first current pressure curve acquisition around crushed zone
Diameter.
As can be seen from the above technical solutions: the crack mode of extension identification device of the application embodiment passes through fracturing fluid
The first current pressure curve obtain extensions path of the man-made fracture 13 around crushed zone 15.Since crushed zone 15 can be to it
The stress field of surrounding formation has some impact on, and when the size of the crustal stress on stratum changes, the crustal stress on stratum
Direction can also occur to change accordingly.So man-made fracture 13 prolongs when man-made fracture 13 extends to 15 surrounding of crushed zone
Stretching pressure will change, and the pressure of fracturing fluid can also occur to change accordingly, and then can be become according to the pressure of fracturing fluid
Change the variation to judge 13 propagation direction of man-made fracture.And then obtain extensions path of the man-made fracture 13 around crushed zone 15.
As shown in Figure 1, in the present embodiment, pressure break module 50 is used to inject fracturing fluid into fracturing string 12, so that
Fracturing fluid, which can enter stratum by preforation tunnel, ruptures stratum, and forms man-made fracture 13, wherein preforation tunnel setting
In on fracturing string 12, and pressure sensor is provided at preforation tunnel.Specifically, first to the fracturing string 12 in pit shaft 11
Unilateral carry out perforation.It is right since hydraulic fracturing is usually vertical man-made fracture 13 in the man-made fracture 13 that stratum depths is formed
Fracturing string 12 is unilateral in pit shaft 11 carries out perforation, only pressure break can be carried out to the unilateral stratum of pit shaft 11, to avoid conventional water
Force causes fracturing fluid construction curve more complicated 11 surrounding two sides of pit shaft or more side stratum concurrent fracturing during splitting
Problem, and then can be realized the precise measurement to single 13 first current pressure curve of man-made fracture.Namely preforation tunnel is located at
The side of fracturing string 12.Then, fracturing fluid is filled into fracturing string 12, and fixed displacement injects fracturing fluid, fracturing fluid is in well
High pressure has been suppressed at bottom, to make 11 adjacent earth formations of pit shaft first rupture by preforation tunnel, to form man-made fracture 13.Into one
Step ground, in order to avoid fracturing fluid is absorbed by stratum, the charge velocity of fracturing fluid is greater than stratum to the absorption rate of fracturing fluid.And
The rate of fracturing fluid cannot be excessive, and to avoid fracturing fluid charge velocity, excessive to cause man-made fracture 13 to extend too fast to stratum
The accurate measurement of middle 15 surrounding man-made fracture of crushed zone, 13 extending pressure impacts.Further, such as Fig. 2, Fig. 3, Fig. 4 institute
Show, fracturing fluid can injected into fracturing string 12, so that fracturing fluid, which can enter stratum by preforation tunnel, makes stratum
Rupture, and the second current pressure curve of fracturing fluid is obtained during forming man-made fracture 13 by pressure sensor.Specifically
Ground is filling fracturing fluid into fracturing string 12, and fixed displacement injects fracturing fluid, and fracturing fluid has suppressed the process of high pressure in shaft bottom
In, the pressure of fracturing fluid is constantly in propradation, and when the pressure of fracturing fluid is higher than formation fracture pressure, stratum occurs broken
It splits, fracturing fluid moment largely flows into man-made fracture 13, so that the pressure of fracturing fluid declines suddenly, the second current pressure curve
Such as the OA section in Fig. 2；OD section in Fig. 3；OQ section in Fig. 2.
First acquisition module 52 injects fracturing fluid into fracturing string 12 for continuing, so that man-made fracture 13 can expand forward
Exhibition；And the first current pressure curve of fracturing fluid is obtained by pressure sensor.Specifically, continue fixed displacement and inject fracturing fluid,
So that man-made fracture 13 can extend forward, when man-made fracture 13 extends to 15 surrounding of crushed zone, around crushed zone 15
The big size and Orientation of the crustal stress on stratum may change, and the extending pressure size of man-made fracture 13 also becomes accordingly
Change, therefore during man-made fracture 13 extends forward, the pressure size of fracturing fluid can also change.Further, pass through
The first current pressure curve understand man-made fracture 13 forward in expansion process fracturing fluid pressure change.
Second, which obtains module 54, is used for according to the first current pressure curve acquisition man-made fracture 13 around crushed zone 15
Extensions path.
Specifically, there are 3 kinds of extensions paths around crushed zone 15 for man-made fracture 13: as shown in Fig. 2, extending road first
In diameter 29, the first current pressure curve is the straight line to remain basically stable.Man-made fracture 13 around crushed zone 15 along first direction to
Preceding extension, wherein first direction is extending direction of the man-made fracture 13 when stratum ruptures.As shown in Fig. 2, AB section 66 is
First current pressure curve of the fracturing fluid in expansion process forward of man-made fracture 13.Due to extending forward in man-made fracture 13 but
Before also not encountering the zone of fracture, the pressure of fracturing fluid is constantly in stable state, and the first current pressure of fracturing fluid is bent at this time
Line is the straight line to remain basically stable.Man-made fracture 13 develops along the extending direction when stratum ruptures.So it is current to work as first
During the entire process of pressure curve man-made fracture 13 extends forward, i.e., man-made fracture 13 is still within substantially after encountering the zone of fracture
Fair state then illustrates that 13 extending pressure of man-made fracture is substantially unchanged around crushed zone 15, further illustrates crushed zone
Stratum stress field around 15 is substantially unchanged, crushed zone 15 on the extension of man-made fracture 13 substantially without influence, so manually
Crack 13 extends forward around crushed zone 15 along first direction.
As shown in figure 3, first current pressure curve includes the first extended segment remained basically stable in the second extensions path 31
17, the first segmental arc 21 of arc-shaped variation, and the second extended segment 19 remained basically stable, wherein the one of the first segmental arc 21
End is connected with the first extended segment 17, and the other end of the first segmental arc 21 is connected with one end of the second extended segment 19, man-made fracture 13
Deviate first direction around crushed zone 15 to extend forward, wherein first direction is man-made fracture 13 when stratum ruptures
Extending direction.As shown in figure 3, VE sections of the first current pressures for the fracturing fluid in man-made fracture 13 forward expansion process are bent
Line.When the pressure of fracturing fluid is in the first extended segment 17, illustrating extending pressure, there is no variations；Man-made fracture 13 is along first
Direction advances.When the pressure of fracturing fluid is in the first segmental arc 21, illustrate that extending pressure occurs around crushed zone 15
Variation further illustrates that the stratum stress field around crushed zone 15 changes, extension of the crushed zone 15 to man-made fracture 13
Certain influence is produced, so that the propagation direction of man-made fracture 13 is changed, i.e. deviation first direction advances.
As shown in figure 3, further, in the second extensions path 31, the first current pressure curve further includes arc-shaped change
Second changed segmental arc 23 and the third extended segment 25 remained basically stable, wherein one end and the second extended segment of the second segmental arc 23
19 other end is connected, and the other end of the second segmental arc 23 is connected with third extended segment 25, and third extended segment 25 is prolonged with first
It is conllinear to stretch section 17, man-made fracture 13 has bypassed crushed zone 15, and around broken during deviation first direction extends forward
Continue to extend forward along first direction after broken band 15.When the pressure of fracturing fluid is in the second extended segment 19, illustrate to extend pressure
Power is substantially unchanged, that is, showing strata pressure, there is no variations, therefore i.e. the deviation of man-made fracture 13 first direction advances
During, do not pass through crushed zone 15.When the pressure of fracturing fluid reaches the by the second segmental arc 23 from the second extended segment 19
When three extended segments 25, illustrate that extending pressure changes around crushed zone 15, further illustrates the stratum around crushed zone 15
Stress field changes, and crushed zone 15 produces certain influence to the extension of man-made fracture 13, so that man-made fracture 13 exists
Deviate after first direction advances and is returned on the first extending direction.Therefore, illustrate in this kind of path, crushed zone 15 is right
The stress field on stratum has a degree of interference, and man-made fracture 13 turns to when by around crushed zone 15, and not
As for crushed zone 15 is passed through, of short duration variation, passes through interference when the first current pressure curve can be around process crushed zone 15 at this time
Restore behind area normal.
As shown in figure 4, first current pressure curve includes the first extended segment remained basically stable in third extensions path 33
17, the first segmental arc 21 and abrupt pressure reduction of arc-shaped variation extend linearly section 29, wherein the one of the first segmental arc 21
End is connected with the first extended segment 17, and the other end of the first segmental arc 21 is connected with the one end for extending linearly section 29, then man-made fracture
13 around crushed zone 15 deviate first direction extends forward, and man-made fracture 13 after deviateing first direction with 15 phase of crushed zone
Connection, wherein first direction is extending direction of the man-made fracture 13 when stratum ruptures.As shown in figure 4, QN sections are artificial
First current pressure curve of the fracturing fluid in expansion process forward of crack 13.Since bust occurs for pressure, illustrate pressure break liquid stream
The natural man-made fracture 13 in 15 region of crushed zone is entered, therefore, man-made fracture 13 is connected with crushed zone 15.
As shown in figure 4, further, in third extensions path 33, the first current pressure curve further includes at least one set
The pressure oscillation section 31 being made of unlifting pressure section 33 and falling pressure section 35, wherein one end of pressure oscillation section 31 and linear
The other end of extended segment 29 is connected, then man-made fracture 13 passes through out of crushed zone 15 after being connected with crushed zone 15.Due to people
When by crushed zone 15, fracturing fluid is largely flowed such as the intrinsic fracture in crushed zone 15, the first current pressure curve in work crack 13
It can decline suddenly, it is possible to thus judge man-made fracture 13 whether by crushed zone 15.Specifically, at the pressure of fracturing fluid
When in pressure oscillation section 31, illustrate that fracturing fluid constantly flows into the intrinsic fracture in 15 region of crushed zone, therefore, man-made fracture
13 constantly link up intrinsic fracture, illustrate that man-made fracture 13 passes through out of crushed zone 15 after being connected with crushed zone 15.
As shown in figure 4, further, in third extensions path 33, the first current pressure curve further includes remaining basically stable
The 4th extended segment 27, wherein the 4th extended segment 27 is connected with the other end of pressure oscillation section 31, and the 4th extended segment 27 with
First extended segment 17 is conllinear, then man-made fracture 13 extends forward after through crushed zone 15 along first direction.When the pressure of fracturing fluid
When power reaches four extended segments 27 from pressure oscillation section 31, illustrate to restore normal after man-made fracture 13 has passed through crushed zone 15.
The above is only several embodiments of the present invention, those skilled in the art can be right according to application documents disclosure
The embodiment of the present invention carries out various changes or modifications without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of crack mode of extension recognition methods characterized by comprising
Fracturing fluid is injected into fracturing string, so that the fracturing fluid can be entered stratum by preforation tunnel and stratum is made to occur to break
It splits, and forms man-made fracture, wherein the preforation tunnel is set on the fracturing string, and is arranged at the preforation tunnel
There is pressure sensor；
Continue to inject the fracturing fluid into the fracturing string, so that the man-made fracture can extend forward；And by described
Pressure sensor obtains the first current pressure curve of the fracturing fluid；
According to extensions path of the man-made fracture around crushed zone described in the first current pressure curve acquisition.
2. mode of extension recognition methods in crack according to claim 1, it is characterised in that: if first current pressure is bent
Line is the straight line to remain basically stable, then the man-made fracture extends forward around the crushed zone along first direction, wherein described
First direction is extending direction of the man-made fracture when the stratum ruptures.
3. mode of extension recognition methods in crack according to claim 1, it is characterised in that: if first current pressure is bent
Line includes the first extended segment remained basically stable, the first segmental arc of arc-shaped variation, and the second extended segment remained basically stable,
In, one end of first segmental arc is connected with first extended segment, the other end of first segmental arc and described second
One end of extended segment is connected, then the man-made fracture deviates first direction around the crushed zone and extends forward, wherein described
First direction is extending direction of the man-made fracture when the stratum ruptures.
4. mode of extension recognition methods in crack according to claim 3, it is characterised in that: if first current pressure is bent
Line further includes the second segmental arc of arc-shaped variation and the third extended segment remained basically stable, wherein the one of second segmental arc
End is connected with the other end of second extended segment, and the other end of second segmental arc is connected with the third extended segment, and
The third extended segment is conllinear with first extended segment, then the process that the man-made fracture extends forward in deviation first direction
In, the crushed zone is bypassed, and continue to extend forward along the first direction after around the crushed zone.
5. mode of extension recognition methods in crack according to claim 1, it is characterised in that: if first current pressure is bent
Line includes that the first extended segment remained basically stable, the first segmental arc of arc-shaped variation and abrupt pressure reduction extend linearly section,
In, one end of first segmental arc is connected with first extended segment, the other end of first segmental arc and described linear
One end of extended segment is connected, then the man-made fracture deviates first direction around the crushed zone and extends forward, and the people
Work crack is connected after deviateing the first direction with the crushed zone, wherein the first direction is the man-made fracture
Extending direction when the stratum ruptures.
6. mode of extension recognition methods in crack according to claim 5, it is characterised in that: if first current pressure is bent
Line further includes at least one set of pressure oscillation section being made of unlifting pressure section and falling pressure section, wherein the pressure oscillation section
One end be connected with the other end for extending linearly section, then the man-made fracture with the crushed zone after being connected from described
Pass through in crushed zone.
7. mode of extension recognition methods in crack according to claim 6, it is characterised in that: if first current pressure is bent
Line further includes the 4th extended segment remained basically stable, wherein the 4th extended segment is connected with the other end of the pressure oscillation section
Connect, and the 4th extended segment is conllinear with first extended segment, then the man-made fracture by after the crushed zone along the
One direction extends forward.
8. mode of extension recognition methods in crack according to claim 1, it is characterised in that: the preforation tunnel is located at described
The side of fracturing string.
9. mode of extension recognition methods in crack according to claim 1, it is characterised in that: the charge velocity of the fracturing fluid
Greater than the stratum to the absorption rate of the fracturing fluid.
10. a kind of crack mode of extension identification device, characterized in that it comprises:
Pressure break module；The pressure break module is for injecting fracturing fluid into fracturing string, so that the fracturing fluid can pass through perforation
Eyelet, which enters stratum, ruptures stratum, and forms man-made fracture, wherein the preforation tunnel is set to the fracturing string
On, and pressure sensor is provided at the preforation tunnel；
First obtains module, and the first acquisition module injects the fracturing fluid into the fracturing string for continuing, so that
The man-made fracture can extend forward；And the first current pressure curve of the fracturing fluid is obtained by the pressure sensor；
Second obtains module, and described second, which obtains module, is used for the man-made fracture according to the first current pressure curve acquisition
Extensions path around crushed zone.
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| CN201811202748.4A CN109184654B (en) | 2018-10-16 | 2018-10-16 | Crack propagation mode identification method and device |
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