CN114136749A - Device and method for preparing artificial rock sample containing inclined cracks - Google Patents
Device and method for preparing artificial rock sample containing inclined cracks Download PDFInfo
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- CN114136749A CN114136749A CN202111453895.0A CN202111453895A CN114136749A CN 114136749 A CN114136749 A CN 114136749A CN 202111453895 A CN202111453895 A CN 202111453895A CN 114136749 A CN114136749 A CN 114136749A
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- 239000011435 rock Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000011440 grout Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 4
- 238000009417 prefabrication Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000004568 cement Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 239000006004 Quartz sand Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides an artificial rock sample preparation device containing inclined cracks, which comprises: system appearance device and angle modulation seat, the apron and the bottom plate of system appearance device are fixed and are connected through the bolt, for convenient dismantlement and the equipment of bolt, carry out bolted connection through the lug, and the angle modulation seat is marked angle commonly used through the inclination of hand crank control support panel on the angle scale, facilitates the use and looks over. The invention also relates to a preparation method of the artificial rock sample containing the inclined cracks. According to the invention, the crack position is determined through the through hole of the front cover plate, and the included angle between the mold base and the horizontal plane can be effectively changed through the angle adjusting seat, so that the prefabrication of inclined cracks with various angles is realized, the problem that the angles of the crack surface and the laying position cannot be accurately controlled in the rock sample pouring process is solved, and the preparation of the artificial rock sample containing the inclined cracks is more standard, efficient and convenient.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a device and a method for preparing an artificial rock sample containing an inclined fracture.
Background
Horizontal well fracture network fracturing is a key technology for improving the productivity of unconventional oil and gas reservoirs such as shale and compact sandstone. Natural fractures that develop in such reservoirs in large numbers are the basis for the formation of complex fracture networks after fracture reformation, and the intersecting behavior of hydraulic fractures and natural fractures has an extremely important influence on the complexity of hydraulic fractures and the spreading of hydraulic fractures in the formation. Therefore, the research on the intersection law of the hydraulic fracture and the natural fracture has important significance for improving the hydraulic fracturing design of unconventional reservoirs.
At present, a true triaxial fracturing physical simulation experiment is one of the most effective technical means for researching the intersection rule of hydraulic fractures and natural fractures. Generally, rock samples used in hydraulic fracture physical simulation experiments mainly include natural rock samples and artificial rock samples. The natural rock sample is made by cutting outcrop rock blocks of a target reservoir stratum, and the artificial rock sample is made by preparing water, cement and quartz sand concrete grout with different proportions according to the mechanical properties of the rock of the actual reservoir stratum and injecting the water, cement and quartz sand concrete grout into an artificial mould for solidification. Because the former gathers troublesome, and consuming time and power, and the complete outcrop piece that satisfies the cutting requirement is difficult to gather to some special lithologic reservoir beds for the latter uses more extensively in fracturing physical simulation experiment.
The application publication number of CN108801739A is a Chinese patent invention disclosing a method for manufacturing an artificial physical rock core, which simulates the brittle mineral components of a natural sandstone core by using a mixture of quartz, cement and a water reducing agent; the clay material is used for simulating the clay mineral composition of the natural sandstone core, and the ratio of quartz, cement, a water reducing agent and the clay material is adjusted, so that the mechanical properties (including compressive strength, elastic modulus and Poisson ratio), the whole-rock mineral composition and the clay mineral composition of the artificial physical core are consistent with those of the natural sandstone. The patent provides a technical method for manufacturing an artificial sandstone rock sample by optimizing material proportion, but does not relate to a processing method for prefabricating natural cracks in the artificial rock sample.
The application publication No. CN104034563A of the invention discloses a preparation method of an artificial core of joint shale, which adopts a mixture of cement, quartz sand, clay, gypsum powder and water to simulate laminated shale, and wheat flakes and paper scraps are added into the mixture to simulate natural cracks in the shale. The patent provides a preparation method of an artificial rock sample containing prefabricated natural cracks, but the inclination angle and the laying position of the prefabricated natural cracks cannot be accurately controlled due to the adoption of oatmeal and shredded paper.
In summary, the existing artificial rock sample preparation methods cannot realize accurate control of the angle and the laying position of the prefabricated crack surface, and are not beneficial to accurately researching the intersection law of the hydraulic crack and the natural crack. Therefore, the device and the method for preparing the artificial rock sample containing the inclined cracks meet the requirement of hydraulic fracturing experimental research on the artificial rock sample containing the natural cracks with the specified inclined angles.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for preparing an artificial rock sample containing inclined cracks, which can effectively change the included angle between a mold base and a horizontal plane through an angle adjusting seat, realize the prefabrication of inclined cracks with various angles and solve the problem that the angles and the laying positions of the crack surfaces cannot be accurately controlled in the existing rock sample pouring process.
In one aspect of the present invention, an artificial rock sample preparation device containing an inclined fracture is provided, which is characterized by comprising: system appearance device, system appearance device includes bottom plate, front shroud, back shroud, left side apron and right side apron, front shroud and right side apron one end fixed connection, back shroud and left side apron one end fixed connection, be equipped with the through-hole on the front shroud, be equipped with supporting bolt on the through-hole, supporting bolt extends to front shroud in-connection pit shaft, the bottom plate lower extreme is equipped with the angle modulation seat, all is provided with the lug on apron and the bottom plate and conveniently dismantles and assemble through bolted connection.
Furthermore, the angle adjusting seat comprises a base, a supporting panel and a screw rod, wherein the base is connected with one end of the supporting panel through a bearing, a baffle is arranged on the supporting panel, the screw rod is arranged at the other end of the base, a supporting rod is arranged on the lower end face of the other end of the supporting panel, and the screw rod is movably connected with the supporting rod; the screw rod is rotated to drive the supporting rod to rise, the supporting panel is lifted, and the rotating angle of the supporting panel is adjusted.
Furthermore, the screw rod is connected with the support rod through a movable shaft, bearings are arranged on two sides of the shaft, pulleys are made through the bearings, and the screw rod is rotatably connected with the support rod.
Further, screw rod one end extends outside the base, extend to serve and be equipped with hand handle, the screw rod removes through shaking hand handle.
Furthermore, a lifting lug is arranged on the sample preparation device, a connecting bolt is arranged on the lifting lug, the cover plate and the bottom plate can be conveniently connected through the bolt, and the device is convenient to disassemble and assemble.
Furthermore, be equipped with the angle scale on the base, the angle scale sets up the side end face of connecting at base and supporting panel, and the angle of inclination is conveniently confirmed, marks angle commonly used at the angle scale.
The invention also provides a preparation method of the artificial rock sample containing the inclined cracks, which is realized by the preparation device of the artificial rock sample containing the inclined cracks and comprises the following steps:
step 1: assembling the sample preparation device, adjusting the angle of the angle adjusting seat through a screw rod, and placing the sample preparation device on the angle adjusting seat;
step 2: preparing water, cement and quartz sand concrete slurry in a specified proportion according to requirements, and determining the position of a crack surface;
and step 3: injecting concrete slurry into the sample preparation device to the first crack surface position, and then suspending pouring;
and 4, step 4: after the rock sample is preliminarily solidified, paving a crack substitute material on a rock sample interface, repeating the step 3 and the step 4 for multiple times according to the number of required cracks, replacing friction type natural cracks by paving A4 paper, replacing cementing type natural cracks by paving a thin marble slab, and ensuring the stability of the performance of the rock sample;
and 5: after the rock sample is primarily solidified, continuously pouring the rock sample until the height of the rock sample is equal to the height of the bevel edge of the sample preparation device;
step 6: after the poured rock sample is primarily solidified, the inclination angle of the sample preparation mold is reset to zero to enable the mold base to be horizontal, and the rock sample is continuously poured until the height of the rock sample is equal to that of the sample preparation device;
and 7: and (3) standing the rock sample for several days, and removing the sample preparation mold after the rock sample is completely solidified, so that the sample preparation is finished.
The invention has the beneficial effects that:
according to the invention, the included angle between the mold base and the horizontal plane can be effectively changed through the angle adjusting seat, the prefabrication of inclined cracks with various angles is realized, the problem that the angle of the crack surface and the laying position cannot be accurately controlled in the rock sample pouring process is solved, the qualification rate of the poured artificial rock sample containing the angle cracks is obviously improved, and the preparation of the artificial rock sample for the fracturing experiment is more standard, efficient and convenient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention;
FIG. 3 is a schematic view of an angle adjustment base of the present invention;
FIG. 4 is a schematic view of a sample preparation device of the present invention;
FIG. 5 is a block flow diagram of the present invention;
FIG. 6 is a schematic diagram of a rock sample hydraulic fracture morphology reconstruction at a pre-fabricated fracture dip angle of 15 degrees, manufactured by the present invention;
FIG. 7 is a schematic diagram of a rock sample hydraulic fracture morphology reconstruction at a pre-fabricated fracture dip angle of 45 degrees, made in accordance with the present invention;
in the figure:
1-bottom plate, 2-front cover plate, 3-right cover plate, 4-rear cover plate, 5-left cover plate, 6-sample preparation device, 7-supporting bolt, 8-lifting lug, 9-shaft, 10-screw, 11-hand handle, 12-base, 13-supporting rod, 14-supporting panel, 15-baffle, 16-angle scale, 17-bearing, 18-through hole, 19-angle adjusting base, 20-first prefabricated crack surface, 21-second prefabricated crack surface, 22-first hydraulic crack expanding track, 23-second hydraulic crack expanding track and 24-connecting bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, includes: system appearance device 6, system appearance device 6 includes bottom plate 1, front shroud 2, back shroud 4, left side apron 5 and right side apron 3, 3 one end fixed connection of front shroud 2 and right side apron, back shroud 4 and 5 one end fixed connection of left side apron, the connection can be dismantled through connecting bolt 24 to the apron expansion end, is equipped with through-hole 18 on the front shroud 2, and through-hole 18 all is equipped with lug 8 through supporting bolt 7 at 2 in-connection mineshafts 9 of front shroud on the apron and on the bottom plate 1, be equipped with connecting bolt 24 on the lug 8, facilitates the dismantlement and the equipment of device.
1 lower extreme of bottom plate is equipped with angle modulation seat 19, and angle modulation seat 19 includes base 12, support panel 14 and screw rod 10, base 12 and support panel 14 one end are passed through the bearing and are connected, and support panel 14 uses the axle of connecting to rotate as the axis of rotation, is equipped with baffle 15 on the support panel 14, and base 12 other end upper end is through a fixed block clamping screw 10, and outside screw rod 10 one end extended to base 12, the extension was served and is equipped with hand handle 11, will rotate the horizontal migration who turns into screw rod 10.
The terminal surface is equipped with bracing piece 13 under the supporting panel 14 other end, screw rod 10 passes through the loose axle with bracing piece 13 and is connected, and the axle both sides are equipped with bearing 17, through the removal of screw rod 10, drive the scaling of bracing piece 13 to drive supporting panel 14's lift and rotation, be equipped with angle scale 16 on the side end face that base 12 and supporting panel 14 are connected, the higher authority is equipped with three angle, from last to being 45, 30 and 15, for angle commonly used down.
According to another aspect of the invention, a method for preparing an artificial rock sample containing inclined cracks is also provided, the method aims to prepare a fracturing experiment artificial rock sample with the size of 300mm × 300mm × 300mm, 2 friction type cracks with the inclination angle of 15 degrees need to be prefabricated and are respectively positioned at two sides of a horizontal shaft, the distance between the center point of a crack surface and the fracturing fluid outflow point at the bottom end of the artificial shaft is 8cm, and the method comprises the following specific implementation steps:
step 1, assembling four cover plates and a bottom plate 1 according to positions, connecting and fixing the four cover plates and the bottom plate by using bolts, placing an assembled sample preparation device 6 on a supporting panel 14, and then rotating the supporting panel 14 to a position of 15 degrees of an angle scale 16 by shaking a hand crank 11; the position of 8cm away from the through hole at the upper side and the lower side is marked along the vertical direction by taking the through hole 18 on the front cover plate 2 as the center;
step 4, after the poured rock sample is primarily solidified, placing the substitute material A4 paper of the friction type crack on the rock sample interface, leveling the upper surface of the pouring layer by using a plastering plate when placing the A4 paper, then continuing pouring the rock sample until the height of the rock sample reaches a position 2-3 cm below the through hole in the front cover plate 2, and temporarily stopping pouring;
and 8, standing the rock sample for several days, and removing the sample preparation mold after the rock sample is completely solidified, so that the sample preparation is finished.
And after the artificial rock sample is demoulded, daily watering and maintaining are carried out to prevent the rock sample from cracking, and then the rock sample is completely wrapped by the preservative film for later use.
Fig. 6 and 7 respectively show a hydraulic fracture shape reconstruction diagram after fracturing experiments are carried out on an artificial rock sample test piece containing preformed fractures with different inclination angles, which is manufactured by the method, when the inclination angle of the preformed fracture is 15 degrees, the intersection angle of the hydraulic fracture and the natural fracture is 75 degrees, and the hydraulic fracture penetrates through a second preformed fracture surface 21 to form a second hydraulic fracture propagation track 23; when the inclination angle of the prefabricated crack is 45 degrees, the intersection angle of the hydraulic crack and the natural crack is 45 degrees, the hydraulic crack turns at the first prefabricated crack surface 20 and extends along the prefabricated crack surface to form a first hydraulic crack expansion track 22; the greater the angle of intersection of the hydraulic fracture with the natural fracture, the easier it is for the hydraulic fracture to penetrate the natural fracture. Therefore, the artificial rock sample manufactured by the device and the method provided by the invention can be effectively used for hydraulic fracturing experiments, and is beneficial to accurately researching the intersection law of hydraulic fractures and natural fractures.
According to the invention, by adding the angle adjusting seat 19, a plurality of adverse factors in the process of manufacturing the artificial rock sample containing the inclined cracks are effectively avoided, so that the preparation of the artificial rock sample is more standard, efficient and convenient.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An artificial rock sample preparation device containing inclined cracks is characterized by comprising: system appearance device (6), system appearance device (6) are including bottom plate (1), front shroud (2), back shroud (4), left side apron (5) and right side apron (3), front shroud (2) and right side apron (3) one end fixed connection, back shroud (4) and left side apron (5) one end fixed connection, be equipped with through-hole (18) on front shroud (2), be equipped with supporting bolt (7) on through-hole (18), supporting bolt (7) extend to front shroud (2) in-connection pit shaft (9), bottom plate (1) lower extreme is equipped with angle modulation seat (19).
2. The device for preparing the artificial rock sample containing the inclined cracks according to claim 1, wherein the angle adjusting seat (19) comprises a base (12), a supporting panel (14) and a screw rod (10), one end of the base (12) is connected with one end of the supporting panel (14) through a bearing, a baffle (15) is arranged on the supporting panel (14), the screw rod (10) is arranged at the other end of the base (12), a supporting rod (13) is arranged on the lower end face of the other end of the supporting panel (14), and the screw rod (10) is movably connected with the supporting rod (13).
3. The device for preparing the artificial rock sample containing the inclined cracks is characterized in that the screw (10) is connected with the support rod (13) through a movable shaft, and bearings (17) are arranged on two sides of the shaft.
4. The device for preparing the artificial rock sample containing the inclined cracks is characterized in that one end of the screw rod (10) extends out of the base (12), and a hand-operated handle (11) is arranged on the extending end.
5. The device for preparing the artificial rock sample containing the inclined cracks is characterized in that a lifting lug (8) is arranged on the sample preparation device (6), and a connecting bolt (24) is arranged on the lifting lug (8).
6. The device for preparing the artificial rock sample containing the inclined cracks is characterized in that an angle scale (16) is arranged on the base (12), and the angle scale (16) is arranged on the side end face where the base (12) is connected with the supporting panel (14).
7. The method for preparing the artificial rock sample containing the inclined cracks is realized by the device for preparing the artificial rock sample containing the inclined cracks according to claim 6, and comprises the following steps:
step 1: the assembling device is used for adjusting the angle of the device and placing the sample preparation device (6) on the angle adjusting seat (19);
step 2: preparing concrete grout according to requirements, and determining the position of a crack surface;
and step 3: injecting concrete slurry into the sample preparation device (6) to the position of the first crack surface;
and 4, step 4: laying a crack substitute material on a rock sample interface after the rock sample is preliminarily solidified, and repeating the step 3 and the step 4 for multiple times according to the number of cracks required;
and 5: after the rock sample is primarily solidified, continuously pouring the rock sample until the height of the rock sample is equal to the height of the bevel edge of the sample preparation device (6);
step 6: after the rock sample is solidified, the angle of the angle adjusting seat (19) returns to zero, and the rock sample is continuously poured until the height of the rock sample is equal to the height of the sample preparation device (6);
and 7: and (5) standing, and dismantling the sample preparation device (6) to finish sample preparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111453895.0A CN114136749A (en) | 2021-12-01 | 2021-12-01 | Device and method for preparing artificial rock sample containing inclined cracks |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111453895.0A CN114136749A (en) | 2021-12-01 | 2021-12-01 | Device and method for preparing artificial rock sample containing inclined cracks |
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| CN202111453895.0A Pending CN114136749A (en) | 2021-12-01 | 2021-12-01 | Device and method for preparing artificial rock sample containing inclined cracks |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117386339A (en) * | 2023-11-14 | 2024-01-12 | 中国石油大学(北京) | Physical simulation device and method for true triaxial fracturing of highly-deviated well |
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| CN103983494A (en) * | 2014-06-09 | 2014-08-13 | 中南大学 | Test device of model for manufacturing rock masses containing interlayers and test method thereof |
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