CN113653478B - Perforating device, test system and test method for hydraulic fracturing simulation experiment - Google Patents

Abstract

The invention provides a perforating device, a test system and an experimental method for a hydraulic fracturing simulation experiment, wherein the perforating device comprises a box body, a driving mechanism and a drilling assembly, the box body is enclosed to form an accommodating space and is provided with a guide hole, the driving mechanism is accommodated in the accommodating space, the output end of the driving mechanism can rotate, the drilling assembly comprises an outer sleeve, an inner sleeve and a drill bit piece, the outer sleeve is arranged on the box body corresponding to the guide hole, the inner sleeve is arranged in the outer sleeve in a penetrating mode and is connected with the output end of the driving mechanism, a spiral groove is formed in the outer sleeve, a straight groove is formed in the inner sleeve, and a guide column which penetrates through the straight groove and is clamped in the spiral groove is arranged on the drill bit piece. Through the technical scheme, the spiral telescopic movement of the drill bit piece can be realized, and then the perforation operation of the horizontal naked eye hole is completed.

Description

Perforating device, test system and test method for hydraulic fracturing simulation experiment

technical field

The invention relates to the technical field of oil and gas development, in particular to a perforating device, a test system and an experimental method for hydraulic fracturing simulation experiments.

Background technique

Shale oil refers to the petroleum resources contained in shale-based shale formations. my country has huge proven reserves of shale oil, which has become an important part of my country's energy strategy. Shale reservoirs have the characteristics of low porosity, low permeability, and low organic matter maturity. Therefore, in order to develop shale reservoirs efficiently, reservoir stimulation technologies such as ultra-long horizontal wells, small well spacing, tight cutting, and three-dimensional development have been proposed. , so that a large number of hydraulic fractures can be formed in the shale oil reservoir, the drainage area of the reservoir can be greatly increased, and a large number of oil and gas migration channels with high conductivity can be formed in the reservoir, thereby greatly improving the conditions for shale oil production and improving the Reservoir recovery.

The shale tight-cutting reservoir stimulation process requires multiple clusters of holes to be shot in each section of horizontal open-hole holes, in order to form multiple transverse main fractures in one fracturing section, thereby increasing the reservoir stimulation volume of a single fracturing section. With the advancement of technology, the distance between fracturing stages has gradually narrowed, and the spacing between stages has been compressed to less than 50m. Considering the stress interference between fractures, the spacing between stages is gradually reduced and the optimization of clustering parameters is also promoted. Experimental research is an important reference for engineering technology and process improvement, but the currently widely used dense cutting technology still lacks sufficient and effective experimental guidance, especially due to the lack of perforating devices that can perform perforating operations in experiments, it is impossible to carry out Experimental verification of helical perforation and staged multi-cluster perforation fracturing.

SUMMARY OF THE INVENTION

In order to at least partially solve the above problems existing in the prior art, the purpose of the embodiments of the present invention is to provide a perforating device, a test system and an experimental method for a hydraulic fracturing simulation experiment.

In order to achieve the above purpose, the present invention provides a perforating device for hydraulic fracturing simulation experiments, wherein the perforating device includes: a box body, a driving mechanism and a drilling assembly; the box body is enclosed to form a receiving space and a guide hole is opened The driving mechanism is accommodated in the accommodating space and the output end can be rotated; the drilling assembly includes an outer casing set on the box corresponding to the guide hole, and an inner casing which is penetrated in the outer casing and connected with the output end of the driving mechanism and a drill bit piece, the outer casing is formed with a spiral groove, the inner casing is formed with a straight groove, and the drill bit is provided with a guide post that passes through the straight groove and is clamped in the spiral groove.

In the embodiment of the present invention, the driving mechanism includes a worm mounted on the box body and a worm gear that is drivingly connected to the worm and placed in the accommodation space, and the inner sleeve is connected to the worm gear.

In the embodiment of the present invention, the opposite sides of the box body are respectively provided with a first installation hole and a second installation hole, both the first installation hole and the second installation hole are provided with bearing parts, and the two ends of the worm are corresponding to one another. The bearing member penetrates through the first mounting hole and the second mounting hole.

In the embodiment of the present invention, at least two connecting posts are provided at one end of the worm that protrudes from the receiving space, and the at least two connecting posts are arranged at intervals along the length direction of the worm, and the driving mechanism further includes selectively connecting with one of the connecting posts. of power.

In the embodiment of the present invention, the inner sleeve includes a first connecting seat embedded in the connecting hole of the worm gear and a pipe body connected to the first connecting seat and passing through the outer sleeve. The two straight grooves are extended along the length direction of the pipe body.

In the embodiment of the present invention, the drill bit piece includes a second connection seat and a drill bit body disposed on the second connection seat, two guide posts are provided on the second connection seat, and the two guide posts are in one-to-one correspondence with the two straight grooves set up.

In the embodiment of the present invention, one end of the straight-running slot is provided with a first limiting slot communicating with the straight-running slot, the other end of the straight-running slot is provided with a second limiting slot communicating with the straight-running slot, the first limiting slot and the second limiting slot The limit grooves are all bent and extended along the straight grooves, and the first limit groove and the second limit groove are extended opposite to each other.

In the embodiment of the present invention, the outer sleeve is built in the receiving space.

In order to achieve the above object, the present invention also provides a test system for a hydraulic fracturing simulation experiment, wherein the test system includes: a true triaxial hydraulic fracturing simulation experiment instrument and the above-mentioned hydraulic fracturing simulation experiment perforation device.

In order to achieve the above object, the present invention further provides a hydraulic fracturing simulation experiment method, wherein the hydraulic fracturing simulation experiment method is applied to the above-mentioned test system for hydraulic fracturing simulation experiment, and the hydraulic fracturing simulation experiment method include:

Drill horizontal open holes in outcrop samples;

The perforating device is controlled to drill the first perforation group on the first section of the horizontal open hole, wherein the first perforation group includes a plurality of helical intervals arranged according to the first preset phase angle and the first preset spacing. a first perforation;

The perforating device is controlled to drill a second perforation group on the second section of the horizontal open hole, wherein the second perforation group includes a plurality of helical intervals arranged according to the second preset phase angle and the second preset interval. a second perforation;

Run the wellbore into the horizontal open hole, and fix and seal the wellbore;

Control the fluid injection system of the true triaxial hydraulic fracturing experimental instrument to inject fracturing fluid into the wellbore and conduct fracturing experiments.

Through the above technical solutions, the perforating device for hydraulic fracturing simulation experiments provided by the embodiment of the present invention has the following beneficial effects:

The perforating device used for the hydraulic fracturing simulation experiment includes a box body, a driving mechanism and a drilling assembly. The box body is enclosed to form an accommodation space and a guide hole is opened. The driving mechanism is accommodated in the accommodation space and the output end can rotate. The drilling assembly includes an outer casing set on the box body corresponding to the guide holes, an inner casing which is penetrated in the outer casing and connected with the output end of the driving mechanism, and a drill bit piece. The outer casing is formed with a spiral groove, and the inner casing is formed There is a straight groove, and the drill bit is provided with a guide column that passes through the straight groove and is clamped in the spiral groove, that is, when the horizontal open hole needs to be verified by the spiral perforation and multi-cluster perforation staged fracturing experiments, the driving mechanism can be used. The inner casing is driven to rotate, and at the same time, the guide column that passes through the straight groove of the inner casing and is clamped in the spiral groove of the outer casing can move along with it. Since the guide column passes through the straight groove and is clamped in the spiral groove, Then, the guide column is further moved in the straight groove and the helical groove at the same time. By coupling the linear motion in the straight groove and the helical motion in the helical groove, the helical telescopic motion of the drill bit is realized, thereby completing the drilling of the horizontal open hole. perforation operation.

Other features and advantages of embodiments of the present invention will be described in detail in the detailed description section that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used to explain the embodiments of the present invention together with the following specific embodiments, but do not constitute limitations to the embodiments of the present invention. In the attached image:

FIG. 1 schematically shows a schematic structural diagram of a perforating device according to an embodiment of the present invention;

FIG. 2 schematically shows a partial structural schematic diagram of a perforating device according to an embodiment of the present invention;

FIG. 3 schematically shows a schematic structural diagram of a box according to an embodiment of the present invention;

FIG. 4 schematically shows a schematic structural diagram of a worm gear according to an embodiment of the present invention;

FIG. 5 schematically shows a schematic structural diagram of an outer sleeve according to an embodiment of the present invention;

FIG. 6 schematically shows a schematic structural diagram of an inner sleeve according to an embodiment of the present invention;

Fig. 7 is a schematic diagram showing the structure of a drill bit according to an embodiment of the present invention.

Description of reference numerals

1 box 11 square box 12 bottom plate 13 containment space 14 first mounting hole 15 second mounting hole 16 pilot hole 17 Bearing parts 2 Drive mechanism twenty one worm 211 annular groove 212 connecting column twenty two worm gear 221 connection hole 222 snap slot 3 outer casing 31 Spiral groove 4 inner casing 41 first connector 42 Tube body 421 straight groove 422 first limit slot 423 The second limit slot 5 drill bits 51 second connector 52 Drill body 53 guide post

Detailed ways

The specific implementations of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

The perforating device for hydraulic fracturing simulation experiment according to the present invention will be described below with reference to the accompanying drawings.

As shown in Figures 1 and 2, in an embodiment of the present invention, a perforating device for a hydraulic fracturing simulation experiment is provided, wherein the perforating device for a hydraulic fracturing simulation experiment includes:

The box body 1 is enclosed to form a receiving space 13 and a guide hole 16 is opened;

The drive mechanism 2 is accommodated in the accommodating space 13 and the output end can be rotated; and

The drilling assembly includes an outer casing 3 arranged on the casing corresponding to the guide holes 16 , an inner casing 4 and a drill bit 5 which are penetrated in the outer casing 3 and connected with the output end of the driving mechanism 2 , and the outer casing 3 is formed on the There is a helical groove 31 , a straight groove 421 is formed on the inner casing 4 , and a guide post 53 is provided on the drill bit 5 to pass through the straight groove 421 and be clamped in the helical groove 31 .

In the embodiment of the present invention, the perforating device used for the hydraulic fracturing simulation experiment includes a box body 1, a driving mechanism 2 and a drilling assembly. The box body 1 encloses a receiving space 13 and opens a guide hole 16, and the driving mechanism 2 accommodates It is placed in the receiving space 13 and the output end can be rotated. The drilling assembly includes an outer casing 3 corresponding to the guide hole 16 on the box body, and an inner casing 3 which passes through the outer casing 3 and is connected to the output end of the driving mechanism 2. The casing 4 and the bit piece 5, the outer casing 3 is formed with a spiral groove 31, the inner casing 4 is formed with a straight groove 421, and the drill bit 5 is provided with a guide column that passes through the straight groove 421 and is clamped in the spiral groove 31 53, that is, when the horizontal open hole needs to be verified by the spiral perforation and multi-cluster perforation staged fracturing experiments, the driving mechanism 2 can drive the inner casing 4 to rotate, and at the same time pass through the straight groove 421 of the inner casing 4. The guide post 53 clamped in the helical groove 31 of the outer sleeve 3 can move along with it. Since the guide post 53 passes through the straight groove 421 and is clamped in the helical groove 31, the guide post 53 is further moved in the straight groove 421 at the same time. By coupling the linear motion in the straight groove 421 with the helical motion in the helical groove 31, the helical telescopic motion of the drill bit 5 is realized, thereby completing the perforating operation of the horizontal open hole.

Please refer to FIG. 1 and FIG. 2 again. In the embodiment of the present invention, the driving mechanism 2 includes a worm 21 mounted on the box body 1 and a worm wheel 22 that is drive-connected to the worm 21 and placed in the receiving space 13. The inner sleeve 4 Connect with the worm gear 22 . That is, the inner sleeve 4 can be rotated by arranging the inner sleeve 4 on the worm wheel 22 to control the worm 21 to rotate. The worm gear 22 and the worm 21 have a compact structure and are arranged in an intersecting manner, so that the perforating operation on the wall surface of the horizontal open hole can be facilitated. Of course, the present invention is not limited, and other suitable driving mechanisms 2 are also possible. Specifically, the transmission ratio between the worm 21 and the worm wheel 22 can reach 10-1000.

Referring to FIGS. 1 to 3 , in the embodiment of the present invention, opposite sides of the box body 1 are respectively provided with a first installation hole 14 and a second installation hole 15 , both of which are provided in the first installation hole 14 and the second installation hole 15 There is a bearing member 17 , and the two ends of the worm 21 pass through the bearing member 17 in the first installation hole 14 and the second installation hole 15 in a one-to-one correspondence. By using the bearing member 17 to support both ends of the worm 21, the friction coefficient during the movement process can be reduced, and the rotation accuracy thereof can be ensured. In addition, the worm 21 and the bearing member 17 can be matched with the base hole system. At the same time, the worm 21 is also provided with an annular groove 211 at the position corresponding to the bearing member 17. An O-ring is placed in the annular groove 211. The depth of the annular groove 211 can be 0.5mm, the inner diameter of the O-ring can be the outer diameter of the worm 21 minus 0.5mm.

In the embodiment of the present invention, the end of the worm 21 protruding from the receiving space 13 is provided with at least two connecting columns 212 , and the at least two connecting columns 212 are arranged at intervals along the length direction of the worm 21 , and the driving mechanism 2 further includes a selective A power piece connected to one of the connecting posts 212 . That is, when the perforating device is perforating the first section of the horizontal open hole, the power element can select at least two connecting columns 212 to connect with one connecting column 212 closest to the box 1, and when the perforating device is in the When perforating the second section of the horizontal open hole, the power element can select the next connecting column 212 for connection, and so on, the perforating operation of the next section can be carried out, so as to realize the staged multi-cluster perforating operation. , it should be noted that the second layer segment is located inside the horizontal open hole compared with the first layer segment. Meanwhile, the distance between two adjacent connecting pillars 212 may be determined according to the distance between corresponding two adjacent layer segments.

Specifically, a motor or a motor can be selected as the power member.

As shown in FIGS. 2 to 4 , in the embodiment of the present invention, the inner sleeve 4 includes a first connecting seat 41 embedded in the connecting hole 221 of the worm wheel 22 and a first connecting seat 41 connected to the first connecting seat 41 and passing through the outer sleeve In the pipe body 42 in the pipe 3 , two straight grooves 421 are arranged at intervals on the pipe body 42 , and the two straight grooves 421 are both extended along the length direction of the pipe body 42 . A snap groove 222 is formed on the hole wall of the connection hole 221 of the worm gear 22 , and the first connection seat 41 includes a first subsection accommodated in the connection hole 221 and a second subsection accommodated in the snap slot 222 . A stable connection between the inner sleeve 4 and the worm gear 22 can be achieved by the blocking action of the snap groove 222 on the second subsection. Meanwhile, the pipe body 42 is a cylindrical pipe body, and the two straight grooves 421 are evenly spaced on the pipe body 42 , that is, the central angle between the two straight grooves 421 may be 180°.

Referring to FIGS. 2 and 7 , in the embodiment of the present invention, the drill bit 5 includes a second connecting seat 51 and a drill body 52 disposed on the second connecting seat 51 , and two guiding posts 53 are disposed on the second connecting seat 51 , the two guide columns 53 are arranged in a one-to-one correspondence with the two straight grooves 421 , so as to ensure the stability of the helical telescopic movement of the drill bit 5 .

As shown in FIG. 6 , in the embodiment of the present invention, one end of the straight-running slot 421 is provided with a first limiting slot 422 that communicates with the straight-running slot 421 , and the other end of the straight-running slot 421 is provided with a second limiting slot that communicates with the straight-running slot 421 . The position groove 423 , the first position limit groove 422 and the second position limit groove 423 are all bent and extended along the straight groove 421 , and the first position limit groove 422 and the second position limit groove 423 are extended opposite to each other. Specifically, when the first limiting groove 422 is provided at one end close to the worm gear 22 and the second limiting groove 423 is provided at one end away from the worm gear 22, then when the drill bit 5 performs the helical extension movement, the second limiting groove The 423 can limit the continued movement of the guide column 53 , and the first limiting groove 422 can limit the continued movement of the guide column 53 when the drill bit member 5 performs the helical retraction movement.

As shown in FIG. 5 , in the embodiment of the present invention, the helical groove 31 may be configured as a helical structure with at least two turns.

Referring to FIG. 1 again, in the embodiment of the present invention, the outer sleeve 3 is built in the receiving space 13. Since the pipe body 42 of the inner sleeve 4 is sleeved in the outer sleeve 3, the inner sleeve 4 is also accommodated in the receiving space. 13, thus making the whole structure compact.

As shown in FIG. 1 and FIG. 3 , in the embodiment of the present invention, the box body 1 includes a square frame 11 and a bottom plate 12 arranged at one end of the square frame 11 . The square frame 11 and the bottom plate 12 are enclosed to form a receiving space 13 . A first mounting hole 14 and a second mounting hole 15 are respectively provided on opposite sides of 11 , a guide hole 16 is provided on the side of the square frame 11 staggered from the first mounting hole 14 and the second mounting hole 15 , and the square frame 11 is far from the bottom plate 12 . An opening is formed at one end, and the first mounting hole 14 and the second mounting hole 15 are arranged closer to the opening than the guide hole 16 , that is, the worm wheel 22 is arranged near the bottom plate 12 and the worm 21 is arranged near the opening.

In order to achieve the above object, the present invention also provides a test system for a hydraulic fracturing simulation experiment, wherein the test system includes: a true triaxial hydraulic fracturing simulation experiment instrument and the above-mentioned hydraulic fracturing simulation experiment perforation device. Since the test system adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

In order to achieve the above object, the present invention further provides a hydraulic fracturing simulation experiment method, wherein the hydraulic fracturing simulation experiment method is applied to the above-mentioned test system for hydraulic fracturing simulation experiment, and the hydraulic fracturing simulation experiment method include:

Drill horizontal open holes in outcrop samples;

Controlling the perforation device to drill the first perforation group on the wall surface of the first layer section of the horizontal open hole, wherein the first perforation group includes helical intervals arranged according to the first preset phase angle and the first preset interval a plurality of first perforations;

Controlling the perforating device to drill the second perforation group on the wall surface of the second layer section of the horizontal open hole, wherein the second perforation group includes helical intervals arranged according to the second preset phase angle and the second preset interval a plurality of second perforations;

Run the wellbore into the horizontal open hole, and fix and seal the wellbore;

Control the fluid injection system of the true triaxial hydraulic fracturing experimental instrument to inject fracturing fluid into the wellbore and conduct fracturing experiments.

Specifically, according to the experimental requirements, horizontal open-hole holes can be drilled in the outcrop rock sample parallel to the bedding direction; entering into the first section of the horizontal open hole, and drilling a plurality of first perforations at helical intervals according to the first preset phase angle and the first preset pitch on the first section to form a first perforation group, That is, the first perforation group is the spiral perforation on the first interval, and the spiral perforation is to perform multiple perforating operations at equal intervals and equal phase angles on the circumferential wall of one interval; The next connecting column 212 on the worm 21 is connected, so that the drill body 52 extends into the second section of the horizontal open hole, and spirals on the second section according to the second preset phase angle and the second preset spacing A plurality of second perforations are drilled at intervals to form a second perforation group, that is, the second perforation group is the helical perforation on the second interval, and the first preset phase angle can be equal to the second preset phase angle , the first preset spacing can be equal to the second preset spacing; the previous step can be repeated to complete the helical perforation operation of the third or more layers, so as to achieve segmented multi-cluster perforation and fracture; then The wellbore is run into the horizontal open hole, and glue can be injected into the annulus between the horizontal open hole and the wellbore. After the glue is condensed, the wellbore is fixed and sealed; finally, the injection of the true triaxial hydraulic fracturing instrument is controlled. The fluid system injects fracturing fluid into the wellbore, and completes the staged multi-cluster perforation fracturing experiment.

Specifically, the staged multi-cluster perforation fracturing experiment can evaluate whether the fracture meets the requirements through the fracturing duration and pressure changes obtained from the experiment.

In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (9)

1. A perforating device for hydraulic fracture simulation experiments, the perforating device comprising:

the box body (1) is enclosed to form an accommodating space (13) and is provided with a guide hole (16);

the driving mechanism (2) is accommodated in the accommodating space (13) and the output end of the driving mechanism can rotate; and

the drilling assembly comprises an outer sleeve (3) arranged on the box body (1) corresponding to the guide hole (16), an inner sleeve (4) arranged in the outer sleeve (3) in a penetrating mode and connected with the output end of the driving mechanism (2), and a drill bit piece (5), wherein a spiral groove (31) is formed in the outer sleeve (3), a straight groove (421) is formed in the inner sleeve (4), and a guide column (53) penetrating through the straight groove (421) and clamped in the spiral groove (31) is arranged on the drill bit piece (5);

the driving mechanism (2) comprises a worm (21) installed on the box body (1) and a worm wheel (22) connected with the worm (21) in a transmission mode and arranged in the accommodating space (13), the inner sleeve (4) is connected with the worm wheel (22), the driving mechanism (2) can drive the inner sleeve (4) to perform rotary motion, and meanwhile the guide columns (53) penetrating through the straight-going groove (421) of the inner sleeve (4) and clamped in the spiral grooves (31) of the outer sleeve (3) follow together to move in the straight-going groove (421) and the spiral grooves (31).

2. The perforating device for the hydraulic fracturing simulation experiment according to claim 1, wherein a first mounting hole (14) and a second mounting hole (15) are respectively formed in two opposite sides of the box body (1), bearing pieces (17) are respectively arranged in the first mounting hole (14) and the second mounting hole (15), and two ends of the worm (21) are correspondingly arranged in the bearing pieces (17) in the first mounting hole (14) and the second mounting hole (15) in a penetrating manner.

3. Perforating device for hydraulic fracture simulation experiments according to claim 2, characterized in that the end of the worm (21) protruding from the housing space (13) is provided with at least two connecting columns (212), at least two connecting columns (212) are sequentially arranged at intervals along the length direction of the worm (21), and the driving mechanism (2) further comprises a power member selectively connected with one of the connecting columns (212).

4. The perforating device for the hydraulic fracturing simulation experiment according to claim 1, characterized in that the inner sleeve (4) comprises a first connecting seat (41) embedded in a connecting hole (221) of the worm gear (22) and a tube body (42) connected with the first connecting seat (41) and penetrating into the outer sleeve (3), two straight-going grooves (421) are arranged on the tube body (42) at intervals, and the two straight-going grooves (421) extend along the length direction of the tube body (42).

5. The perforating device for hydraulic fracture simulation experiments as claimed in claim 4, wherein the drill bit piece (5) comprises a second connecting seat (51) and a drill bit body (52) arranged on the second connecting seat (51), two guide posts (53) are arranged on the second connecting seat (51), and the two guide posts (53) are arranged in one-to-one correspondence with the two straight grooves (421).

6. The perforating device for the hydraulic fracturing simulation experiment according to any one of claims 1 to 5, wherein one end of the straight groove (421) is provided with a first limiting groove (422) communicated with the straight groove (421), the other end of the straight groove (421) is provided with a second limiting groove (423) communicated with the straight groove (421), the first limiting groove (422) and the second limiting groove (423) are both arranged along the straight groove (421) in a bending and extending manner, and the first limiting groove (422) and the second limiting groove (423) are arranged in a back-to-back extending manner.

7. Perforating device for hydraulic fracture simulation experiments according to any of claims 1 to 5, characterized in that the outer casing (3) is built into the receiving space (13).

8. A testing system for hydraulic fracture simulation experiments, the testing system comprising: a true triaxial hydraulic fracture simulation experiment instrument and a perforating device for hydraulic fracture simulation experiments according to any one of claims 1 to 7.

9. A hydraulic fracture simulation experiment method, wherein the hydraulic fracture simulation experiment method is applied to the test system for the hydraulic fracture simulation experiment according to claim 8, and the hydraulic fracture simulation experiment method comprises the following steps:

drilling a horizontal naked eye hole on the outcrop rock sample;

controlling a perforating device to drill a first perforation group on a first layer section of the horizontal naked eye, wherein the first perforation group comprises a plurality of first perforations spirally arranged at intervals according to a first preset phase angle and a first preset interval;

controlling the perforating device to drill a second perforation group on a second layer section of the horizontal naked eye, wherein the second perforation group comprises a plurality of second perforations spirally arranged at intervals according to a second preset phase angle and a second preset interval;

a shaft is put into the horizontal open hole, and the shaft is fixed and sealed;

and controlling an injection system of the true triaxial hydraulic fracturing experimental instrument to inject fracturing fluid into the shaft, and performing a fracturing experiment.

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