CN110388201A - A kind of synthetic core sample production method for simulating hydraulically created fracture true form - Google Patents
A kind of synthetic core sample production method for simulating hydraulically created fracture true form Download PDFInfo
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- CN110388201A CN110388201A CN201810203410.4A CN201810203410A CN110388201A CN 110388201 A CN110388201 A CN 110388201A CN 201810203410 A CN201810203410 A CN 201810203410A CN 110388201 A CN110388201 A CN 110388201A
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Abstract
The invention discloses a kind of synthetic core sample production methods for simulating hydraulically created fracture true form, make original square rock beam using the underground rock core or same layer position outcropping rock of oil and gas reservoir section；Rock beam is cleaved along its length using rock beam splitting device, and obtains rock sample rough surface topographic data after splitting with three-dimensional laser scanner；Rock sample surface roughness values after cleaving are calculated, and according to rock sample after a pair of splitting that can most represent the reservoir hydrfracturing fracture faces pattern of roughness value selection；According to rough surface topographic data 3D printer making artificial rock sample sampling die；And according to the Reservoir Section rock forming mineral group assignment system synthetic core sample making material, compacting forms the synthetic core sample of simulation hydraulically created fracture true form.Production method principle of the invention is simple, and device therefor processing and fabricating is convenient, and can batch making is consistent with reservoir rock mineral constituent, rough surface pattern is true and unified rock sample, be convenient for testing.
Description
Technical field
The present invention relates to increasing yield of oil and natural gas renovation technique field, in particular to a kind of simulation hydraulically created fracture is true
The synthetic core sample production method of form.
Background technique
Hydraulic fracturing is the major measure of oil-gas reservoir storey increase design, when construction by pit shaft to oil and gas reservoir squeezing have compared with
Highly viscous fracturing fluid is then formed on the reservoir of shaft bottom very high when the speed for injecting fracturing fluid is more than the absorbability of reservoir
Pressure, when this pressure be more than shaft bottom near reservoir rock fracture pressure when, reservoir rock will be pressed off and generate crack.
Rock is mutually cohered by multi mineral particle with cementing agent, the main cementing agent weaker along mechanical property of hydraulically created fracture
Part extension extends, to determine that fracture faces are uneven, has certain roughness.Carrying out object in hydraulic fracturing room
When managing simulated experiment, need using the rock sample with rough surface, to restore hydraulically created fracture true form；Meanwhile it need to criticize
Amount production has the rock sample of fixed rough surface, to guarantee to carry out experiment under same rough surface morphology, sees clearly experiment ginseng
The influence of several pairs of results of Physical, to provide accurate guidance for hydraulic fracturing conceptual design.
In order to repeat to make the rock sample with fixed rough surface, domestic and foreign scholars have done many trials.Existing production is thick
The method of rough surface rock sample is broadly divided into three kinds, i.e., direct casting method, 3D printing mold+casting method, 3D printing method.
(1) direct casting method: Du Shigui (2010) is based on rock mass structural plane shearing strength mechanism and analog material is theoretical, grinds
The novel analog material being mixed to form with raw materials such as high-strength cement, silicon powder, high efficiency water reducing agent, normal sand, water has been made, material will be simulated
Material is added to protolith rough surface and is directly poured.
(2) 3D printing mold+casting method: Xiong Zuqiang (2015) obtains limestone primitive nature structure using spatial digitizer
Then the high-precision point cloud data of face configuration of surface reconstructs the configuration of surface in natural structure face by reverse engineering software and contains certainly
The three dimensional virtual models of right structural plane, and then (green material is poly- by the PLA in 3D printing technique production face containing natural structure
Lactic acid) plastic mold, finally using the superfine cement and superfine quartz sand that can quickly solidify as making material, by PLA structural plane
The sample in mold pouring molding natural structure containing rock face in sample preparation box.
(3) 3D printing method: Ju Yang (2014) is comprehensive using CT imaging, Three-dimensional Gravity using photopolymer material as making material
The coal petrography model of structure and 3D printing technique preparation comprising complicated crack；Sergey Ishutov (2015) uses the third ethylene-fourth two
The 3D printings materials such as alkene-styrene (ABS acrylonitrile butadiene styrene), by " rock core scanning-gray scale
The systematization pore structure production process of histogram processing-printer printing ", prints the hole net in scaled reservoir rock
Network；Tian Wei (2017) uses CT scan, rock sample geometrical model three-dimensional reconstruction and 2 kinds of different 3D printing techniques --- and it is laser sintered
(SLS), three dimensional printing (3DP) --- it is reconstructed the 3D printing sample being close with natural sandstone sample internal structure, SLS technique
Using precoated sand as printed material, cohered by the resin of laser sintered fusing sand grain surface attachment, and 3DP technique with
Furane resins are adhesive, cohere emery dust end.
Although these types of method can repeat the rock sample that production has fixed rough surface to a certain extent, simulating
Have certain limitation in terms of hydraulically created fracture true form: (1) above method is not all to natural rock sample itself mineral group
Divide the essential informations such as (particle, cement etc.), mineral grain granularity to carry out detailed analysis, leads to the basic constituent of synthetic core sample
There are larger differences with natural rock sample for matter, pore structure characteristic etc., take into account porosity, permeability, density etc. to cannot obtain
The mechanical properties such as physical property and compression strength, elasticity modulus, shearing strength with the consistent synthetic core sample of natural rock sample.(2)
The rough surface morphology of the rock sample of direct casting method production and original rock sample there are large error, cause its mechanical property also with original
There are relatively large deviations for beginning rock sample.(3) 3D printing method is successively sprayed, is stacked, and the rock sample of production has apparent layering, and original
The structure feature of rock sample is not inconsistent.(4) not for the rough surface morphology choosing for representing certain Reservoir Section hydraulically created fracture true form
Method is taken to conduct a research.(5) do not suppressed during preparing rock sample, obtained by rock beam intensity cannot reach pressure break
The requirement of construction and strata pressure interaction, is unable to satisfy the effect of fracturing experiments.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of artificial rocks for simulating hydraulically created fracture true form
Sample making process, the production method use true mineral constituent, both can guarantee structure feature, mechanical property and original rock sample one
It causes, and rough surface morphology reduction precision can be improved, principle is simple, and device therefor processing and fabricating is convenient, and is able to achieve unified thick
The mass of rough surface rock sample makes, and is convenient for testing.
To reach the above technical purpose, the present invention provides following technical scheme.
A kind of synthetic core sample production method for simulating hydraulically created fracture true form, which is characterized in that including walking as follows
It is rapid:
S1, the underground rock core or same layer position outcropping rock for acquiring oil and gas reservoir section, utilize cutting machine and end face Plane surface grinding machine
Make the identical original square rock beam of muti-piece size；
S2, using graver in the middle part of original square rock beam along the prefabricated scratch of rock beam length direction, prefabricated scratch is made
Rectangular rock beam；Adopt the rectangular rock beam quality W for the prefabricated scratch that weighs with scale0；
S3, the rectangular rock beam of scratch prefabricated in step S2 is put into rock beam splitting device, and ensures rock beam splitting device
Upper cutter head and lower cutter head be directed at prefabricated scratch；Rock beam splitting device is put in plate under pressure testing machine, adjusts pressure testing
Machine upper flat plate position is allowed to the upper cutter head mounting plate flat contact with rock beam splitting device；Starting pressure testing machine slowly pressurizes
Until the rectangular rock beam of prefabricated scratch is broken into rock sample after a pair of splitting with matte surface finish；It weighs with scale after splitting
Rock sample quality W1；
S4, rock sample rough surface topographic data after splitting is obtained using three-dimensional laser scanner, and calculate rock sample after splitting
The fractal dimension D of rough surface pattern, rock sample surface roughness values JRC after being cleaved；
Rock sample surface roughness values JRC after S5, the splitting of the muti-piece according to acquired in step S4, choosing a pair can most represent
Rock sample after the splitting of the reservoir hydrfracturing fracture faces pattern；
S6, it is by rock sample both ends polishing after splitting selected in step S5 using wire cutting machine or rock core end face rounding machine
Semi arch obtains the rock sample for meeting API diversion chamber shape criteria；
S7, up and down the two of the rock sample for meeting API diversion chamber shape criteria in three-dimensional laser scanner obtaining step S6 are utilized
A rough surface topographic data；
S8, the upper surface rough morphology data of the rock sample for meeting API diversion chamber shape criteria obtained in step S7 are led
Enter in 3D printer, makes 1# sampling die；By the following table of the rock sample for meeting API diversion chamber shape criteria obtained in step S7
Face rough morphology data import in 3D printer, make 2# sampling die；
S9, rock mine is determined to underground rock core or same layer position outcropping rock the progress total rock ensaying of oil and gas reservoir section
Object component carries out casting body flake observation and grain size analysis, determines rock core granularmetric composition；
S10, the mineral constituent obtained using step S9, casting body flake observation and results of grain size analysis, are screened and according to the ratio
The required mineral of making artificial rock sample are weighed, then cementing agent and above-mentioned mineral are sufficiently mixed uniformly, obtain making artificial rock sample
Raw mixture；
S11, the lower compacting cover board and side baffle for assembling synthetic core sample sample preparation device load 1# sample preparation described in step S8
Mold pours into the raw mixture of the obtained making artificial rock sample of step S10, cover board and piston is suppressed in loading, by sample preparation
Device is sent into pressure testing machine, and compacting forms the synthetic core sample of the rough morphology of lower surface containing rock sample；
S12, using 2# sampling die described in step S8, using step S11 the method to get to containing table on rock sample
The synthetic core sample of face rough morphology；The synthetic core sample of the rough morphology of lower surface containing rock sample and the people of the rough morphology of upper surface containing rock sample
Lithogenesis sample is the synthetic core sample for simulating hydraulically created fracture true form.
Further, a kind of synthetic core sample system for simulating hydraulically created fracture true form according to claim 1
Make method, which is characterized in that in step S1, the size of the original square rock beam is long 176mm, width 36mm, high 50mm.
Further, in step S2, scratch is answered straight, is less than along any two points away from the difference in height of rock beam upper surface on scratch
1mm, scratch depth and width are respectively less than 1mm.
Further, in step S3, pressure testing machine pressure-loaded rate is 5kN/min when rock beam cleaves.
Further, in step S3, it is also necessary to which rectangular rock beam and the rock sample after splitting for calculating prefabricated scratch are of poor quality
(W0-W1), calculated result should be less than 3g, otherwise sample preparation again；One oil and gas reservoir section at least makes 5 pairs of splitting rock samples.
Further, in step S4, when calculating rock sample surface roughness values JRC after cleaving, rock after splitting is calculated first
Increase variable between sample surface bulge point:
In formula: V (r) --- increase variable；
R --- step-length；
J --- the sample points in step-length r are one section of upper measurement point quantity that length is r on equal separated time；
N --- total sample points on the equal separated time are measurement points total on the equal separated time；
yi--- for the direction y any point coordinate on rock beam；
Z(yi) --- in yiThe height of the coarse point of section at point；
In lg [V (ri)] and lg (ri) relational graph in, there are linear relationships for the two, it may be assumed that
lg[V(ri)]=δ lg (ri)+A (2)
Wherein: δ is the slope of equation, and A is the intercept of equation；
There are following relationships with slope δ for fractal dimension D:
Relationship between roughness value JRC and fractal dimension D are as follows:
JRC=85.2671 (D-1)0.5679 (4)
Rock sample rough surface pattern after splitting is measured using three-dimensional laser scanner as a result, then utilizes formula
(1), formula (2) and formula (3) calculate rock sample Surface Fractal Dimension D, and formula (4) is recycled to can be obtained by rock sample surface after characterization splitting
The roughness value JRC of uneven degree.
Further, according to rock sample surface roughness values JRC distribution characteristics after multipair splitting, roughness value is chosen
JRC represents the reservoir hydrfracturing fracture faces pattern for rock sample fracture faces after the splitting of median.
Further, in step S6, the semicircle arc dia for meeting the rock sample of API diversion chamber shape criteria is 36mm.
Further, in step S10, the raw mixture quality poured into is W1/2。
Further, in step S11, pressing process need to guarantee to be forced into 15MPa and pressure stabilizing 20min.
The beneficial effects of the present invention are:
The present invention provides a kind of synthetic core sample production methods of completely new simulation hydraulically created fracture true form:
1, through the invention provided by method, can batch making and the consistent rock sample of reservoir rock mineral constituent, also
Original goes out true reservoir environment；
2, for made rock sample by cementing, compression, mechanical property is almost the same with reservoir rock；
3, rock sample rough surface topographic data is obtained using three-dimensional laser scanner, and makes sample preparation using 3D printing technique
Mold produces the true and unified rock sample of rough surface pattern using same sampling die, efficiently solves prior art system
The standby big problem of rock sample surface topography difference provides a large amount of systems to restore real roughness fracture pattern and carrying out physical simulation experiment
One changes rock sample；
4, the choosing method of Reservoir Section hydraulically created fracture true form typical case's rough surface morphology is established, is related real
It is proposed guidance is tested to use for reference；
5, multiple groups comparative experiments can be carried out by the rock sample that same sampling die is produced, convenient for coarse in fixation surface
Influence of the quantitative study different experimental conditions to experimental result under pattern.
Detailed description of the invention
Fig. 1 is original square rock beam schematic diagram；
Fig. 2 is the rectangular rock beam schematic diagram of prefabricated scratch；
Fig. 3 is rock beam splitting device structural schematic diagram；
Fig. 4 is rock sample schematic diagram after splitting；
Fig. 5 is the rock sample schematic diagram for meeting API diversion chamber shape criteria；
Fig. 6 is synthetic core sample sample preparation device structural schematic diagram.
In figure:
1 be original square rock beam, 2 be prefabricated scratch rectangular rock beam, 2-1 be prefabricated scratch, 3 be rock beam splitting device,
3-1 is upper cutter head mounting plate, 3-2 is upper cutter head, 3-3 is rock plate clamp holder, 3-4 is lower cutter head, 3-5 is lower cutter head mounting plate, 4
It is upper rock sample after splitting for rock sample, 4-1 after splitting, 4-2 is lower rock sample after splitting, 4-3 is splitting crack, 5 to meet API water conservancy diversion
Rock sample, the 5-1 of chamber shape standard are the upper rock sample for meeting API diversion chamber shape criteria, 5-2 is to meet API water conservancy diversion chamber shape mark
Quasi- lower rock sample, 5-3 be meet API diversion chamber shape criteria rock sample crack, 6 be synthetic core sample sample preparation device, 6-1 is upper compacting
Cover board, 6-2 are upper compacting cover board/Piston attachment bolts hole, 6-3 be piston/above suppress cover board link bolt hole, 6-4 be piston,
Under 6-5 is side baffle, 6-6 is side baffle demounting bolt hole, 6-7 is side baffle fastening bolt holes, 6-8 is sampling die, 6-9 is
Suppress cover board/side baffle fastening bolt holes, 6-10 is lower compacting cover board.
Specific embodiment
The invention will be further described with example with reference to the accompanying drawing.
A kind of synthetic core sample production method for simulating hydraulically created fracture true form, key step are as follows:
Original square rock beam 1 is made using the underground rock core or same layer position outcropping rock of oil and gas reservoir section；In original-party
The 1 prefabricated scratch 2-1 in middle part of shape rock beam；The rectangular rock beam 2 of prefabricated scratch is cleaved using rock beam splitting device 3, and uses three-dimensional laser
Scanner obtains 4 fracture faces rough morphology data of rock sample after splitting；4 surface roughness values JRC of rock sample after cleaving is calculated, and
According to rock sample 4 after a pair of splitting that can most represent the reservoir hydrfracturing fracture faces pattern of roughness value JRC selection；It will choosing
Rock sample 4 is further cut into the rock sample 5 for meeting API diversion chamber shape criteria after the splitting taken out；Utilize 3 D laser scanning
Instrument obtains the rough surface topographic data for meeting the rock sample 5 of API diversion chamber shape criteria；According to rough surface topographic data 3D
Printer making artificial rock sample sampling die 6-8；Underground rock core or same layer position to oil and gas reservoir section are appeared, and to carry out rock complete
Rock ensaying, casting body flake observation, grain size analysis, and on this basis determine making artificial rock sample mineral constituent proportion and
Particle diameter distribution；Quantitatively determine the required mineral that partial size weighs making artificial rock sample, is proportionally added into cementing agent, and utilize synthetic core sample
(i.e. the rough morphology of lower surface containing rock sample is artificial for the synthetic core sample of the production simulation hydraulically created fracture true form of sample preparation device 6
The synthetic core sample of rock sample and the rough morphology of upper surface containing rock sample).
The production method of its synthetic core sample, specifically successively includes the following steps:
(1) the underground rock core for acquiring the M6 well oil and gas reservoir section of Changqing oilfields block, is polished using cutting machine and end face
Rock is made as the original square rock beam 1 of long 176mm, wide 36mm, high 50mm by machine；
(2) use graver at 1 middle part of original square rock beam along the prefabricated scratch 2-1 of rock beam length direction, prefabricated scratch 2-1
Answer straight, difference in height on prefabricated scratch 2-1 along any two points away from rectangular rock beam upper surface is less than 1mm, prefabricated scratch 2-1 depth
1mm is respectively less than with width；Weigh with scale the 2 mass W of rectangular rock beam of prefabricated scratch0；
(3) the rectangular rock beam 2 of prefabricated scratch described in step (2) is put into rock beam splitting device 3；Rock beam is cleaved and is filled
It sets 3 to be placed between two parallel-plates of pressure testing machine, the rock beam splitting device includes upper cutter head mounting plate 3-1, rock beam folder
Holder 3-3, lower cutter head mounting plate 3-5, the upper cutter head mounting plate 3-1 are equipped with upper cutter head 3-2 directed downwardly, the lower cutter head peace
Loading board 3-5 is equipped with lower cutter head 3-4 upward；
Adjustment pressure testing machine flat position is allowed to the upper cutter head mounting plate 3-1 flat contact with rock beam splitting device, and
Ensure that the upper cutter head 3-2 and lower cutter head 3-4 of rock beam splitting device are directed at prefabricated scratch 2-1；Starting pressure testing machine slowly pressurizes
Until the rectangular rock beam 2 of prefabricated scratch ruptures, two rock samples up and down are formed, after rock sample 4-1 upper after splitting and splitting
Lower rock sample 4-2, is splitting crack 4-3 between upper and lower rock sample, and hydraulic press loading speed is 5kN/min；
(4) the gross mass W of lower rock sample 4-2 after adopting upper rock sample 4-1 after weighing with scale splitting and cleaving1, prefabricated scratch
(the W of poor quality of rectangular rock beam 2 and rock sample 4 after splitting0-W1) it should be less than 3g, it otherwise should sample preparation again；One block at least makes 5
Rock sample 4 after block splitting.
Splitting front and back rock sample quality is as shown in table 1.
The different rock sample splittings of table 1 front and back quality controls table
In above-mentioned measurement result, Y-2 rock sample splitting front and back of poor quality is 4.4g, does not meet sample preparation standard, therefore casts out.
(5) 4 rough surface topographic data of rock sample after cleaving, and the coarse shape of gauging surface are obtained using three-dimensional laser scanner
The fractal dimension D of looks；
Increment function between 4 surface bulge point of rock sample after splitting are as follows:
In formula: V (r) --- increase variable；
R --- step-length；
J --- the sample points in step-length r are one section of upper measurement point quantity that length is r on equal separated time；
N --- total sample points on the equal separated time are measurement points total on the equal separated time；
yi--- for the direction y any point coordinate on rock beam；
Z(yi) --- in yiThe height of the coarse point of section at point.
In lg [V (ri)] and lg (ri) relational graph in, there are linear relationships for the two, it may be assumed that
lg[V(ri)]=δ lg (ri)+A (2)
Wherein: δ is the slope of equation, and A is the intercept of equation.
There are following relationships with slope δ for fractal dimension D:
Relationship between roughness value JRC and fractal dimension D are as follows:
JRC=85.2671 (D-1)0.5679 (4)
4 surface roughness values JRC calculated result of rock sample is as shown in table 2 after 5 pairs of splittings.
The rock sample surface roughness values JRC table of comparisons after table 2 cleaves
| Rock sample 4 is numbered after splitting | Roughness value JRC |
| Y-1 | 12.5 |
| Y-3 | 13.1 |
| Y-4 | 14.0 |
| Y-5 | 13.0 |
| Y-6 | 12.6 |
(6) 4 surface roughness values JRC of rock sample after the splitting according to acquired in step (5), this can most be represented by choosing a pair
Rock sample 4 after the splitting of reservoir hydrfracturing fracture faces pattern；As shown in Table 2, in this experiment, 5 pairs splitting after rock sample 4 table
Surface roughness coefficient JRC is 12.5~14, and distribution is more concentrated, median 13.0, thus selects Y-5 rock sample fracture faces generation
The table reservoir hydrfracturing fracture faces pattern；
It (7) is straight by Y-5 rock sample both ends polishing selected in step (6) using wire cutting machine or rock core end face rounding machine
The semi arch of diameter 36mm obtains the rock sample 5 for meeting API diversion chamber shape criteria, and top half, which is used as, meets API diversion chamber shape
The upper rock sample 5-1 of shape standard, lower half portion is as the lower rock sample 5-2 for meeting API diversion chamber shape criteria；
(8) the upper rock sample 5- for meeting API diversion chamber shape criteria described in three-dimensional laser scanner obtaining step (7) is utilized
1 and meet API diversion chamber shape criteria lower rock sample 5-2 rough surface topographic data；
(9) by the rough surface pattern number of the upper rock sample 5-1 for meeting API diversion chamber shape criteria obtained in step (8)
According to importing in 3D printer, production is used to suppress the sampling die 6-8 of the synthetic core sample of the rough morphology of lower surface containing rock sample, at this time
Sampling die 6-8 be 1# sampling die；By the lower rock sample 5-2's for meeting API diversion chamber shape criteria obtained in step (8)
Rough surface topographic data imports in 3D printer, the system of synthetic core sample of the production for suppressing the rough morphology of upper surface containing rock sample
Original mold has 6-8, and sampling die 6-8 at this time is 2# sampling die；
(10) total rock ensaying is carried out to the underground rock core of M6 well Reservoir Section and determines rock forming mineral component, it is thin to carry out the body of casting
Piece observation and grain size analysis determine rock core granularmetric composition；It is as shown in Table 3 and Table 4 to analyze result:
3 M6 well reservoir core mineral constituent of table analysis
4 M6 well reservoir core size distribution of table
| Granularity (mm) | <0.01 | 0.01~0.05 | 0.05~0.1 | 0.10~0.15 | 0.15~0.20 | 0.20~0.25 | >0.25 |
| Accounting (%) | 10 | 9 | 11 | 10 | 24 | 14 | 22 |
(11) it using step (10) described total rock ensaying, casting body flake observation and results of grain size analysis, screens and presses
Proportion weighs the required mineral of making artificial rock sample, then silicate cementing agent and above-mentioned mineral are sufficiently mixed uniformly, is made
Make synthetic core sample raw mixture, quality W1/ 2=369.75g；
(12) the lower compacting cover board 6-10 and side baffle 6-5 for assembling synthetic core sample sample preparation device 6, load institute in step (9)
The 1# sampling die stated, pours into the raw mixture of making artificial rock sample described in step (11), in loading compacting cover board 6-1 with
Sample preparation device is sent into pressure testing machine by piston 6-4, is forced into 15MPa and pressure stabilizing 20min, release, is taken out to get to containing
The synthetic core sample of rock sample lower surface rough morphology；The synthetic core sample sample preparation device includes upper compacting cover board 6-1 and lower hold-down cover
Plate 6-10, the two side baffle 6-5 in left and right, piston 6-4 and sampling die 6-8, piston 6-4 pass through piston/above compacting cover board connection
Cover board 6-1, pedestal of the lower compacting cover board 6-10 as sampling die 6-8, on side baffle 6-5 are suppressed in bolt hole 6-3 connection
Equipped with side baffle demounting bolt hole 6-6, side baffle fastening bolt holes 6-7；It in preparation process, is suppressed downwards with piston 6-4, batch
Change the synthetic core sample that the required rough morphology of lower surface containing rock sample is made；
(13) using 2# sampling die described in step (9), using step (12) the method, i.e. institute is made in mass
The synthetic core sample of the rough morphology of upper surface containing rock sample needed.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of synthetic core sample production method for simulating hydraulically created fracture true form, which comprises the steps of:
S1, the underground rock core or same layer position outcropping rock for acquiring oil and gas reservoir section, are made using cutting machine and end face Plane surface grinding machine
The identical original square rock beam of muti-piece size；
S2, using graver in the middle part of original square rock beam along the prefabricated scratch of rock beam length direction, the rectangular of prefabricated scratch is made
Rock beam；Adopt the rectangular rock beam quality W for the prefabricated scratch that weighs with scale0；
S3, the rectangular rock beam of scratch prefabricated in step S2 is put into rock beam splitting device, and ensures the upper of rock beam splitting device
Cutter head and lower cutter head are directed at prefabricated scratch；Rock beam splitting device is put in plate under pressure testing machine, is adjusted on pressure testing machine
Flat position is allowed to the upper cutter head mounting plate flat contact with rock beam splitting device；Starting pressure testing machine slowly pressurize up to
The rectangular rock beam of prefabricated scratch is broken into rock sample after a pair of splitting with matte surface finish；Weigh with scale rock sample after cleaving
Quality W1；
S4, rock sample rough surface topographic data after splitting is obtained using three-dimensional laser scanner, and calculate rock sample surface after splitting
The fractal dimension D of rough morphology, rock sample surface roughness values JRC after being cleaved；
Rock sample surface roughness values JRC after S5, the splitting of the muti-piece according to acquired in step S4, the storage can most be represented by choosing a pair
Rock sample after the splitting of layer hydraulically created fracture surface topography；
S6, rock sample both ends after splitting selected in step S5 are polished as semicircle using wire cutting machine or rock core end face rounding machine
Arc obtains the rock sample for meeting API diversion chamber shape criteria；
S7, two tables up and down for the rock sample for meeting API diversion chamber shape criteria in three-dimensional laser scanner obtaining step S6 are utilized
Face rough morphology data；
S8, the upper surface rough morphology data of the rock sample for meeting API diversion chamber shape criteria obtained in step S7 are imported into 3D
In printer, 1# sampling die is made；The lower surface of the rock sample for meeting API diversion chamber shape criteria obtained in step S7 is thick
Rough topographic data imports in 3D printer, makes 2# sampling die；
S9, rock forming mineral group is determined to underground rock core or same layer position outcropping rock the progress total rock ensaying of oil and gas reservoir section
Point, carry out casting body flake observation and grain size analysis, determines rock core granularmetric composition；
S10, mineral constituent, casting body flake observation and the results of grain size analysis obtained using step S9, are screened and are weighed according to the ratio
The required mineral of making artificial rock sample, then cementing agent and above-mentioned mineral are sufficiently mixed to the original for uniformly obtaining making artificial rock sample
Expect mixture；
S11, the lower compacting cover board and side baffle for assembling synthetic core sample sample preparation device load 1# sample preparation mould described in step S8
Tool pours into the raw mixture of the obtained making artificial rock sample of step S10, suppresses cover board and piston in loading, sample preparation is filled
It sets and is sent into pressure testing machine, compacting forms the synthetic core sample of the rough morphology of lower surface containing rock sample；
S12, using 2# sampling die described in step S8, using step S11 the method to get thick to upper surface containing rock sample
The synthetic core sample of rough pattern；The synthetic core sample of the rough morphology of lower surface containing rock sample and the artificial rock of the rough morphology of upper surface containing rock sample
Sample is the synthetic core sample for simulating hydraulically created fracture true form.
2. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S1, the size of the original square rock beam is long 176mm, width 36mm, high 50mm.
3. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S2, scratch is answered straight, and difference in height on scratch along any two points away from rock beam upper surface is less than 1mm, and scratch is deep
Degree is respectively less than 1mm with width.
4. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S3, pressure testing machine pressure-loaded rate is 5kN/min when rock beam cleaves.
5. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S3, it is also necessary to rock sample (W of poor quality after calculating the rectangular rock beam of prefabricated scratch and cleaving0-W1), calculate knot
Fruit should be less than 3g, otherwise sample preparation again；One oil and gas reservoir section at least makes 5 pairs of splitting rock samples.
6. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S4, when calculating rock sample surface roughness values JRC after cleaving, calculates rock sample surface bulge after splitting first
Increase variable between point:
In formula: V (r) --- increase variable；
R --- step-length；
J --- the sample points in step-length r are one section of upper measurement point quantity that length is r on equal separated time；
N --- total sample points on the equal separated time are measurement points total on the equal separated time；
yi--- for the direction y any point coordinate on rock beam；
Z(yi) --- in yiThe height of the coarse point of section at point；
In lg [V (ri)] and lg (ri) relational graph in, there are linear relationships for the two, it may be assumed that
lg[V(ri)]=δ lg (ri)+A (2)
Wherein: δ is the slope of equation, and A is the intercept of equation；
There are following relationships with slope δ for fractal dimension D:
Relationship between roughness value JRC and fractal dimension D are as follows:
JRC=85.2671 (D-1)0.5679 (4)
Rock sample rough surface pattern after splitting is measured using three-dimensional laser scanner as a result, then utilizes formula (1), formula
(2) and formula (3) calculates rock sample Surface Fractal Dimension D, and formula (4) is recycled to obtain rock sample surface irregularity degree after characterization splitting
Roughness value JRC.
7. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S5, according to rock sample surface roughness values JRC distribution characteristics after multipair splitting, chooses roughness value JRC
The reservoir hydrfracturing fracture faces pattern is represented for rock sample fracture faces after the splitting of median.
8. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S6, the semicircle arc dia for meeting the rock sample of API diversion chamber shape criteria is 36mm.
9. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S10, the raw mixture quality poured into is W1/2。
10. a kind of synthetic core sample production method for simulating hydraulically created fracture true form according to claim 1, special
Sign is, in step S11, pressing process need to guarantee to be forced into 15MPa and pressure stabilizing 20min.
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Application publication date: 20191029 |