CN110145291A - A kind of volume fracturing dynamic row's of returning simulator and analogy method - Google Patents
A kind of volume fracturing dynamic row's of returning simulator and analogy method Download PDFInfo
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- CN110145291A CN110145291A CN201910413486.4A CN201910413486A CN110145291A CN 110145291 A CN110145291 A CN 110145291A CN 201910413486 A CN201910413486 A CN 201910413486A CN 110145291 A CN110145291 A CN 110145291A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 239000003245 coal Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000004088 simulation Methods 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 17
- 239000011435 rock Substances 0.000 claims description 13
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 208000002925 dental caries Diseases 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000000280 densification Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 206010010149 Complicated fracture Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention discloses a kind of volume fracturing dynamic row's of returning simulator and analogy methods.The simulator includes the airtight cavity surrounded by closed shell, upper steel plate and lower steel plate；Airtight cavity is divided into high temperature and pressure working cavity and dynamic control cavity by mobile sealing plate；Mobile sealing plate moves between high temperature and pressure working cavity and dynamic control cavity；It is equipped with three-dimensional core model in high temperature and pressure working cavity, is equipped with load fluid injection pipe in three-dimensional core model；The upper steel plate of dynamic control cavity is equipped with liquid injecting tube.The present invention controls the design of cavity pressure control using simulation pressure break three-dimensional core model, and dynamic, can study the seam net formation mechenism such as bed gas reservoir and shale gas reservoir and microcrack extension factor.The present invention returns heat-extraction system by designing the volume fracturing dynamic to match with live pressing crack construction, can study fracturing fluid delay to the physical property action rule of the three-dimensional core model such as coal petrography and shale.
Description
Technical field
The present invention relates to a kind of volume fracturing dynamic row's of returning simulator and analogy methods, belong to shale gas and coal bed gas etc.
The technical field of exploitation, fracturing fluid recovery (backflow), fracturing yield increasing is transformed in untraditional reservoir.
Background technique
China's unconventional oil and gas reserves are huge, with being continuously increased for proved reserves, rationally effective development tool by
More and more extensive concern.Using shale oil-gas reservoir, bed gas reservoir, DAMAGE OF TIGHT SAND GAS RESERVOIRS as the Complex Reservoir of representative, there is reservoir
Densification, poor connectivity, the features such as permeability is extremely low, filtrational resistance is big.Volume fracturing be cost-effectively exploit it is such unconventional
One of oil-gas reservoir key technology, this technology can make reservoir generate complicated fracture network system, make reservoir overall permeability
It is promoted, reservoir development degree increases substantially, and realizes multiple to shale oil-gas reservoir, bed gas reservoir, DAMAGE OF TIGHT SAND GAS RESERVOIRS etc.
The three-dimensional fracturing reform of miscellaneous oil reservoir.
However, fracturing fluid dynamic returns production capacity effect after being drained through journey influence pressure.Due to complicated reservoir conditions, a large amount of fracturing fluids
It is stranded in stratum, causes its row of returning to lead extremely low.Meanwhile proppant backflow, the fractures sand, drain age velocity occurred during the row of returning
Slack-off equal challenges, are unfavorable for reservoir protection, cause capacity loss.In oil-gas geology and recovery ratio 2017 volume 24, note
" compact oil reservoir fracturing fluid filtrate returns row and leads influence factor laboratory experiment " text that department will plum et al. is delivered has been carried, has been pointed out in article
Fracturing fluid recovery (backflow) is the principal element for influencing shale oil reservoir, densification and Low permeable oil and gas reservoirs fracturing effect.SHENGLI PETROLEUM AREA pressure break money
Material shows that general compact oil reservoir fracturing fluid filtrate is returned row and led less than 30%~40%, and shale oil reservoir is less than 20%, a large amount of fracturing fluids
It is stranded in stratum, causes water flooding lock serious, has seriously affected the effect of fracturing reform.Petrochemical industry applies 2009 volume 28
In, describe " the anti-proppant anti-return fracturing fluid in gas field quickly study by the row of returning " text that bad great waves et al. is delivered, article middle finger
Low porosity and low permeability reservoir should pay attention to fracturing fluid recovery (backflow) problem out.Fracturing fluid must quickly return discharge stratum after pressure break, while cannot produce
Raw proppant backflow, otherwise can shake out in drain test process, reduce drain age velocity, extend the residence time of pressure break raffinate,
It is unfavorable for reservoir protection.
Summary of the invention
The object of the present invention is to provide a kind of volume fracturing dynamic row's of returning simulator and analogy method, described device can be with
It simulates coal petrography and seam net that the isometric pressure break of shale is formed, and subsequent fracturing fluid filtrate dynamic may be implemented returns to be drained through journey；
The present invention can be achieved crack dynamic changing process and return with live actual pressure break to be drained through journey and match, and can further investigate pressure break and surge
State return encounter during row etc. various challenges, provide the reasonably row of returning for the live pressing crack construction such as coal bed gas and shale gas
System and guidance method.
Simulator of the present invention is able to bear biggish pressure (0~90MPa), passes through the three-dimensional rock core mould such as coal petrography and shale
Fracturing fluid injects and returns heat-extraction system to simulate volume fracturing dynamic and return and be drained through journey in type, is drained through to return with the practical pressure break at scene
Journey matches, and has the characteristics that easy to operate, security performance is strong, has good stability.
The overall dimensions of simulator of the present invention can are as follows: long: 120~150cm, wide: 120~150cm, high: 45~60cm.
Specifically, the volume fracturing provided by the present invention dynamic row of returning simulator, including by closed shell, upper steel plate and
The airtight cavity that lower steel plate surrounds；
The airtight cavity is divided into high temperature and pressure working cavity and dynamic control cavity by mobile sealing plate；
The mobile sealing plate moves between the high temperature and pressure working cavity and dynamic control cavity；
It is equipped with three-dimensional core model in the high temperature and pressure working cavity, is equipped with load fluid in the three-dimensional core model and infuses
Enter pipe；
The upper steel plate of the dynamic control cavity is equipped with liquid injecting tube, is provided with flow on the liquid injecting tube
Control valve, effect is the adjustment dynamic control cavity gas liquid ratio and then controls the compressed coefficient, and then reaches control system pressure
Power, simulate volume fracturing during pressure dynamic change purpose.
In above-mentioned simulator, 15MnVR steel is can be used in the closed shell, the upper steel plate and the lower steel plate
Plate, thickness can be 16~20cm；
15MnVR steel plate can be used in the mobile sealing plate, and thickness can be 10~15cm.
In above-mentioned simulator, the three-dimensional core model can be the natural outcrop rock core of acquisition, the natural outcrop
The size of rock core is as follows:
A length of 15~45cm, width are 15~45cm, a height of 7~23cm；
The three-dimensional core model is to simulate the core model of coal petrography and shale etc..
In above-mentioned simulator, the mobile sealing plate passes through a sliding rail (the groove type retaining rail of approximate half-circular
Road) it is mobile；The sliding rail can guarantee that the mobile sealing plate is moved along determining track, avoid under larger pressure,
The accidents such as skew, leakage pressure occur for the mobile sealing plate；
The edge (surrounding and convex portion) of the mobile sealing plate is provided with gum cover, and one is to ensure that the closed of experiment
Property；Second is that reducing the degree of wear of the mobile sealing plate.
In above-mentioned simulator, the airtight cavity is divided into the high temperature by four mobile sealing plates
High-pressure work cavity and four dynamics control cavity.
In above-mentioned simulator, one end of the dynamic control cavity is by flange seal；
Sand control screens and gum cover are equipped between the flange and dynamic control cavity, the effect of the sand control screens is filtering
Fall the particle in fracturing fluid, reduces the degree of wear of the gum cover.
In above-mentioned simulator, the load fluid injection pipe is set to the center of the three-dimensional core model, is used for
Discharge fracturing fluid is injected and returned, volume fracturing is simulated and fracturing fluid dynamic is returned and is drained through journey；
The inside of the three-dimensional core model is evenly arranged several oil saturation sensors, for monitoring coal petrography and shale
Etc. the variation of oil saturation in matrix and crack；
The edge and center position of the three-dimensional core model are equipped with temperature and pressure transmitter, for monitoring coal petrography and page
The variation of temperature and pressure in the three-dimensional core model such as rock.
In above-mentioned simulator, the middle position in the edge of the three-dimensional core model is equipped with 4 temperature
Pressure sensor, when accurately monitoring the fracturing fluid dynamic row's of returning pressure drop, the temperature and pressure of the three-dimensional core model surrounding
Variation；
The center position of the three-dimensional core model is provided with 1 temperature and pressure transmitter, accurately monitors pressure break
When liquid injection pressure increases and when fracturing fluid dynamic is returned row pressure power and is reduced, temperature near the three-dimensional core model injection end and
The variation of pressure；
The temperature measuring point and pressure tap of the temperature and pressure transmitter are in same position.
In above-mentioned simulator, the three-dimensional seam pessimistic concurrency control includes pressure break major fracture and pressure-break net, by quartz sand or
Haydite support.
In above-mentioned simulator, the injection direction on the load fluid injection pipe along load fluid be successively arranged pressure gauge and
Sand-adding device.
The present invention also provides a kind of volume fracturing dynamic row of returning analogy methods, include the following steps:
Fracturing base fluid is taken into sand injection pipe as described in the volume fracturing dynamic row of returning simulator and injects the three-dimensional
In core model, volume fracturing is carried out to the three-dimensional core model (such as natural outcrop rock core), forms it into three-dimensional seam net mould
Type, the pressure of the high temperature and pressure working cavity is greater than the pressure of dynamic control cavity at this time, promotes the three-dimensional seam net
Fracture propagation in model, and then the mobile sealing plate is pushed to expand outwardly, for simulating volume fracturing process；
After injecting fracturing base fluid, unloading pressure controls the pressure of the high temperature and pressure working cavity less than the dynamic
The pressure of cavity, then the mobile sealing plate is shunk, and then compresses the fluid in the three-dimensional seam pessimistic concurrency control, makes to inject
Fracturing base fluid start the row of returning, return for simulating fracturing fluid dynamic and be drained through journey.
Further include following pressure testing step before simulating volume fracturing process in above-mentioned analogy method:
The load fluid injection pipe in the volume fracturing dynamic row of returning simulator is connected to the pressure of assembly valve
It splits on high pressure line, Open valve, is passed through fracturing fluid base fluid in the Xiang Suoshu volume fracturing dynamic row of returning simulator, is suppressed
Pressure processing, maintains 30~40min of maximum working pressure, and pressure testing criterion of acceptability is not pierce not leaking.It can be according to specific construction site
Determine maximum working pressure；
In above-mentioned analogy method, during simulating volume fracturing process and the simulation fracturing fluid dynamic row of returning, according to following
Step control system pressure realizes that the dynamic to pressure during simulation volume fracturing process and the simulation fracturing fluid dynamic row of returning becomes
Change:
Liquid is injected into dynamic control cavity from the liquid injecting tube, controls pressure by controlling gas liquid ratio
Contracting coefficient, and then control system pressure achieve the purpose that the dynamic change of pressure during simulation volume fracturing and the dynamic row of returning.
The invention has the following beneficial effects:
(1) present invention is realized is drained through journey and matches with live practical dynamically return, and analog volume fracturing dynamic, which is returned, to be drained through
Journey has the characteristics that easy to operate, experimental data is accurate and reliable, this be conducive to further investigate the row of returning during proppant backflow,
The challenges such as the low row of returning leads, reservoir damage, fractures sand are conducive to formulate the reasonable row of returning system, provide live pressure break and apply
Work guidance method.
(2) the fracturing fluid dynamic of the present invention row of returning simulator, is designed using groove type trapped orbit, is efficiently avoided
The accidents such as skew, leakage pressure occur under larger pressure, achieve the purpose that have good stability, security performance it is strong.
(3) present invention controls the design of cavity and the closed steel plate of dynamic mobile formula by dynamic, can control gas liquid ratio in turn
The compressed coefficient is controlled, and then reaches control system pressure, simulates the purpose of Pressure behaviour variation during volume fracturing.
(4) present invention realizes the monitoring of experiment parameter during the dynamic row of returning, can the bases such as real-time monitoring coal petrography and shale
Temperature, pressure and oil saturation in matter crack, this is conducive to the influence factor of the analysis dynamic row of returning.
(5) present invention controls the pressure change in coal petrography and the isometric crack of shale by design dynamic control cavity, and
And shell and upper and lower plates use high strength steel plate material and enclosed material with a thickness of 16~20cm, the pressure that can bear it
Up to 90MPa reaches high voltage bearing purpose.
(6) present invention controls the design of cavity pressure control using simulation pressure break three-dimensional core model, and dynamic, can study coal seam
Gas reservoir and shale gas reservoir etc. stitch net formation mechenism and microcrack extends factor.
(7) present invention returns heat-extraction system by designing the volume fracturing dynamic to match with live pressing crack construction, can study pressure
Liquid delay is split to the physical property action rule of the three-dimensional core model such as coal petrography and shale.
Detailed description of the invention
Fig. 1 is the overall structure diagram (top view) of the volume fracturing dynamic of the present invention row of returning simulator；
Fig. 2 is that the structure of the three-dimensional core model such as coal petrography and shale in the volume fracturing dynamic of the present invention row of returning simulator is shown
It is intended to；
Fig. 3 is the main view of the volume fracturing dynamic of the present invention row of returning simulator；
Fig. 4 is I-I cross-sectional view in Fig. 1；
Fig. 5 is II-II cross-sectional view in Fig. 4；
Fig. 6 is III-III cross-sectional view in Fig. 1；
It is respectively marked in figure as follows:
1, upper (lower) steel plate；2, sand control screens；3 rubber sleeves；4, bolt；5, washer；6, mobile sealing plate；7, flange；8,
Dynamic control cavity；9, high temperature and pressure working cavity；10-1,10-2,10-3,10-4 temperature and pressure transmitter (mainly monitor coal
The surrounding of the three-dimensional core model such as rock and shale)；11, temperature and pressure transmitter (the main three-dimensional rock core of monitoring coal petrography and shale etc.
The injection end of model)；12, liquid injecting tube；13, oil saturation sensor；14, load fluid injection pipe；15, sliding rail；16, coal
The three-dimensional core model such as rock and shale；17, pressure break major fracture；18, pressure-break net；19, closed shell；20, upper (lower) steel plate with
Rubber sleeve between mobile sealing steel plate；21, the rubber sleeve between upper (lower) steel plate and shell；22, the rubber of track is sealed
Set.
Specific embodiment
Invention is described in detail below with reference to embodiment and Figure of description, but not limited to this.
Embodiment 1, the volume fracturing dynamic row of returning simulator
The volume fracturing dynamic of the present invention row of returning simulator, overall structure diagram (top view) is as shown in Figure 1, the body
Overstock the size for splitting the dynamic row of returning simulator are as follows: long: 120~150cm, wide: 120~150cm is high: 45~60cm.The simulation
Device includes closed shell 19, experiment cavity, wherein experiment cavity is (resistance to a thickness of 10~15cm by mobile sealing steel plate 6
Pressure value is 0~90MPa) it is separated into high temperature and pressure working cavity 9 and dynamic control cavity 8.Mobile sealing steel plate 6 passes through sliding rail
15 with closed shell 19 (with a thickness of 16~20cm, pressure voltage is 0~90MPa) and upper (lower) steel plate 1 (with a thickness of 16~20cm,
Pressure voltage is 0~90MPa) it is tightly connected, sliding rail 15 can ensure that mobile sealing steel plate 6 is moved along determining track, avoid
The safety accidents such as skew, leakage pressure occur in larger pressure downward moving sealing steel plate 6.In dynamic control 8 side of cavity by flange 7
(with a thickness of 16~20cm, pressure voltage is 0~90MPa) closed closure (being connected by bolt 4), the other side is mobile sealing steel plate
6.The three-dimensional core model 16 such as coal petrography and shale of setting simulation fracturing fracture structure, pressure break in high temperature and pressure working cavity 9
Structural schematic diagram is formed, wherein coal as shown in Fig. 2, including pressure break major fracture 17 and pressure-break net 18 by quartz sand or haydite afterwards
The size of the three-dimensional core model 16 such as rock and shale are as follows: long: 15~45cm, width are 15~45cm, a height of 7~23cm.As Fig. 1,
Shown in Fig. 3 and Fig. 6, the center of the three-dimensional core model 16 such as coal petrography and shale is provided with load fluid injection pipe 14, is taking
Pressure gauge, sand-adding device are disposed with along load fluid injection direction on sand liquid injection pipe 14；In the three-dimensional rock core such as coal petrography and shale
The inside of model 16 is evenly arranged with oil saturation sensor 13, and center and peripheral position is provided with temperature and pressure transmitter
11,10-1,10-2,10-3,10-4 are provided with a temperature pressure in three-dimensional 16 center position of core model such as coal petrography and shale
Force snesor 11, there are four temperature, pressures for the middle position setting on the edge of the three-dimensional core model 16 such as coal petrography and shale
Sensor 10-1,10-2,10-3 and 10-4.
It is provided with liquid injecting tube 12 at the upper steel plate of dynamic control cavity 8, is additionally provided with flow control valve thereon, is made
With being that adjustment dynamic control 8 gas liquid ratio of cavity controls the compressed coefficient in turn, and then reaches control system pressure, volume fracturing is simulated
The purpose of the dynamic change of pressure in the process.
As shown in figure 4, mobile sealing steel plate 6 surrounding and convex portion be provided with rubber sleeve (upper (lower) steel plate with
The rubber sleeve 21 between rubber sleeve 20 and upper (lower) steel plate and closed shell between mobile sealing steel plate), one is to ensure that reality
The airtightness tested；Second is that reducing the degree of wear of mobile sealing steel plate 6.As shown in figure 5, in the convex of mobile sealing steel plate 6
The rubber sleeve 22 that part is provided with sealing track is played, the height of rubber sleeve 22 is slightly above the convex portion of mobile sealing steel plate 6,
One is to ensure that the airtightness of experiment；Second is that reducing the degree of wear of mobile sealing steel plate convex part.
As shown in Figure 1, sand control screens 2 and rubber sleeve 3 are disposed in dynamic control cavity 8 side corresponding with flange 7,
Designing the effect of sand control screens 2 herein is the particle filtered out in fracturing fluid, reduces the degree of wear of rubber sleeve 3.
Volume fracturing is simulated using apparatus of the present invention and the anti-process arranged is as follows:
Fracturing fluid is injected into the three-dimensional core model 16 such as coal petrography and shale by load fluid injection pipe 14, to natural outcrop
Rock core carries out volume fracturing, forms it into three-dimensional seam pessimistic concurrency control.The pressure of high temperature and pressure working cavity 9 is greater than dynamic and controls at this time
The pressure of cavity 8, fluid forces mobile sealing steel plate 6 expand outwardly, this process simulation volume fracturing process；When slow unloading
When pressure, the pressure of high temperature and pressure working cavity 9 is less than the pressure that dynamic controls cavity 8, and the movable type expanded outwardly at this time is close
It seals steel plate 6 and compresses the three-dimensional fluid stitched in pessimistic concurrency control 16 such as coal petrography and shale, so that the fracturing fluid of injection is started the row of returning, this process mould
Quasi- fracturing fluid dynamic, which is returned, is drained through journey.
The application method of embodiment 2, the volume fracturing dynamic row of returning simulator
As steps described below using the volume fracturing dynamic of the present invention row of returning simulator:
(1) all parts included in above-mentioned simulator are assembled；
(2) pressure testing:
The load fluid injection pipe 14 of the volume fracturing dynamic row of returning simulator is connected to the fracture used high-pressure of assembly valve
On pipeline, Open valve is passed through fracturing fluid base fluid into the volume fracturing dynamic row of returning simulator, carries out the processing that builds the pressure, maintain
30~40min of maximum working pressure, pressure testing criterion of acceptability are not pierce not leaking.Highest work pressure is determined according to specific construction site
Power.
(3) control system pressure:
Liquid is injected into dynamic control cavity 8 from liquid injecting tube 12, passes through control gas liquid ratio control compression system
Number, and then control system pressure simulate the dynamic change of pressure during volume fracturing and the dynamic row of returning.
(4) volume fracturing:
Fracturing base fluid is injected in the three-dimensional core model 16 such as coal petrography and shale by taking sand injection pipe 14, to natural outcrop rock
The heart carries out volume fracturing, forms it into three-dimensional seam pessimistic concurrency control.The pressure of high temperature and pressure working cavity 9 is adjusted in turn, at this time high temperature
The pressure of high-pressure work cavity 9 is greater than the pressure that dynamic controls cavity 8, and mobile sealing steel plate 6 starts to expand to 7 direction of flange
, during simulating volume fracturing with this, the variation for the flaw size that fracturing fluid is flowed through carries out the dynamic adjustment of seam net, to
After stitching net size adjusting, start to inject load fluid into the three-dimensional core model such as coal petrography and shale；
(5) the dynamically row of returning:
After fracturing base fluid injection experiments, slow unloading pressure, since dynamic control 8 pressure of cavity is greater than high temperature and pressure
9 pressure of working cavity, the mobile sealing steel plate 6 in expansion state start to shrink automatically, and then load fluid is injected by taking sand
Pipe 14 returns the three-dimensional core model 16 of discharge coal petrography and shale etc., is returned with this dynamic for simulating load fluid in volume seam net and is drained through journey；
(6) release is cleaned:
The volume fracturing dynamic row of returning simulator is shed into pressure, sealing steel plate is opened, proppant and residual liquid is discharged.
Claims (10)
1. a kind of volume fracturing dynamic row of returning simulator, including the closed chamber surrounded by closed shell, upper steel plate and lower steel plate
Body；
The airtight cavity is divided into high temperature and pressure working cavity and dynamic control cavity by mobile sealing plate；
The mobile sealing plate moves between the high temperature and pressure working cavity and dynamic control cavity；
It is equipped with three-dimensional core model in the high temperature and pressure working cavity, is equipped with load fluid in the three-dimensional core model and injects
Pipe；
The upper steel plate of the dynamic control cavity is equipped with liquid injecting tube.
2. simulator according to claim 1, it is characterised in that: the mobile sealing plate is steel plate, with a thickness of 10
~15cm；
The mobile sealing plate is mobile by a sliding rail；
The edge of the mobile sealing plate is provided with gum cover.
3. simulator according to claim 1 or 2, it is characterised in that: the airtight cavity is by four movable types
Sealing plate is divided into the high temperature and pressure working cavity and four dynamic control cavitys；
One end of the dynamic control cavity is by flange seal；
Sand control screens and gum cover are equipped between the flange and dynamic control cavity.
4. simulator according to any one of claim 1-3, it is characterised in that: the load fluid injection pipe is set to institute
State the center of three-dimensional core model；
The inside of the three-dimensional core model is evenly arranged several oil saturation sensors；
The edge and center of the three-dimensional core model are equipped with temperature and pressure transmitter.
5. simulator according to claim 4, it is characterised in that: the three-dimensional core model such as Yu Suoshu coal petrography and shale
Center is provided with 1 temperature and pressure transmitter；
The middle position at the edge of the three-dimensional core model such as the coal petrography and shale is equipped with 4 temperature and pressure transmitters.
6. simulator according to any one of claims 1-5, it is characterised in that: the three-dimensional seam such as the coal petrography and shale
Pessimistic concurrency control includes pressure break major fracture and pressure-break net, is supported by quartz sand or haydite.
7. simulator according to claim 6, it is characterised in that: the size of the three-dimensional core model is as follows:
A length of 15~45cm, width are 15~45cm, a height of 7~23cm.
8. simulator described in any one of -7 according to claim 1, it is characterised in that: edge is taken on the load fluid injection pipe
The injection direction of sand liquid is successively arranged pressure gauge and sand-adding device.
9. a kind of volume fracturing dynamic row of returning analogy method, includes the following steps:
Sand injection will be taken described in the fracturing base fluid dynamic of the volume fracturing as described in any one of the claim 1-8 row of returning simulator
In the pipe injection three-dimensional core model, volume fracturing is carried out to the rock core in the three-dimensional core model, forms it into three-dimensional
Pessimistic concurrency control is stitched, the pressure of the high temperature and pressure working cavity is greater than the pressure of dynamic control cavity at this time, and then pushes institute
It states mobile sealing plate to expand outwardly, for simulating volume fracturing process；
By it is described take sand injection pipe inject fracturing base fluid after, unloading pressure keeps the pressure of the high temperature and pressure working cavity small
In the pressure of dynamic control cavity, then the mobile sealing plate is shunk, and then compresses the three-dimensional core model
In fluid, so that the fracturing base fluid of injection is started the row of returning, dynamically return for simulating fracturing fluid and be drained through journey.
10. analogy method according to claim 9, it is characterised in that: in simulation volume fracturing process and simulation fracturing fluid
During the dynamic row of returning, liquid is injected into dynamic control cavity from the liquid injecting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910413486.4A CN110145291B (en) | 2019-05-17 | 2019-05-17 | Volume fracturing dynamic flowback simulation device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910413486.4A CN110145291B (en) | 2019-05-17 | 2019-05-17 | Volume fracturing dynamic flowback simulation device and method |
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| Publication Number | Publication Date |
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| CN110145291A true CN110145291A (en) | 2019-08-20 |
| CN110145291B CN110145291B (en) | 2020-01-17 |
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| CN201910413486.4A Active CN110145291B (en) | 2019-05-17 | 2019-05-17 | Volume fracturing dynamic flowback simulation device and method |
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