CN108104788A - For determining that gas well fracturing returns the logistics organizations apparatus and method on row's opportunity and proppant fracturing fluid regurgitant volume - Google Patents
For determining that gas well fracturing returns the logistics organizations apparatus and method on row's opportunity and proppant fracturing fluid regurgitant volume Download PDFInfo
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- CN108104788A CN108104788A CN201810089396.XA CN201810089396A CN108104788A CN 108104788 A CN108104788 A CN 108104788A CN 201810089396 A CN201810089396 A CN 201810089396A CN 108104788 A CN108104788 A CN 108104788A
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- Prior art keywords
- inlet
- rock core
- pressure
- proppant
- fracturing fluid
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The present invention disclose it is a kind of be used for determine that gas well fracturing returns the logistics organizations apparatus and method on row's opportunity and proppant fracturing fluid regurgitant volume,This is used to determining that gas well fracturing to return the logistics organizations device of row's opportunity and proppant fracturing fluid regurgitant volume and includes cylindrical body,First end cap and the second end cap,Pressue device,Gas injection apparatus and reflux and pressure test probe,Cylindrical body,With the inner volume placed for rock core,The inlet and inlet and outlet connected respectively positioned at both ends and with the inner volume,And it is arranged on side and the return port connected respectively with the inner volume,Instrument connection and pressurization hole,Correspondence is covered on the inlet and the inlet and outlet respectively for first end cap and the second end cap,And it encloses to set jointly to form the closed cavity that builds the pressure with the inner wall of the inner volume,Pressue device is through the pressurization hole and for abutting and pressurizeing with the rock core,Clossing pressure, which is provided, for the rock core containing crack fixes the rock core.
Description
Technical field
It is more particularly to a kind of to be used to determine that gas well fracturing returns row's opportunity and support the present invention relates to stimulation technology field
The logistics organizations apparatus and method of agent fracturing fluid regurgitant volume.
Background technology
For reservoir after hydraulic fracturing is transformed, rational fracturing fluid, which returns opportunity and the row's of returning system, can effectively control proppant to return
It flows and ensures optimization distribution of the proppant in crack, so that crack has higher flow conductivity after pressure, reach expected
Effect of increasing production.However lag behind the optimal row's of returning opportunity or return that discharge capacity is too low will to cause fracturing fluid to be detained stratum, stratum is caused
Injury；It in the optimal row's of returning opportunity or returns that discharge capacity is excessively high will to cause proppant largely to flow back in advance, is laid so as to influence proppant.
For gas well after pressure, reservoir output gas also leads to proppant stress in crack in addition to fracturing fluid discharge is more advantageous to
State changes.Therefore consider effect of the output gas to the row of returning after pressure for gas well, specify different reservoir condition, different works
Rational pressure break returns row's opportunity and the row's of returning system and is respectively provided with significance for volume increase stable yields and reservoir protection under the conditions of skill.
Although the reflux of proppant can be simulated in pertinent literature, it can not realize and build the pressure, therefore stop after pressure break can not be simulated
Pump pressure.The row of returning of fracturing fluid is also only accounted in pertinent literature, does not consider proppant backflow.At present simultaneously for gas well
The row's of returning opportunity is not related to also with the correlative study that the row of returning system optimizes after the effect of output gas pushes.
The content of the invention
The main object of the present invention is to propose one kind to flow back with proppant fracturing fluid for determining that gas well fracturing returns row's opportunity
The logistics organizations apparatus and method of amount, it is intended to for determining that gas well fracturing returns row's opportunity and proppant fracturing fluid regurgitant volume.
To achieve the above object, one kind proposed by the present invention is used to determine that gas well fracturing returns row's opportunity and proppant fracturing fluid
The logistics organizations device of regurgitant volume, including：
Cylindrical body has the inner volume placed for rock core, respectively connects positioned at both ends and with the inner volume
Inlet and inlet and outlet and the return port for being arranged on side and being connected respectively with the inner volume, instrument connection and pressurization hole；
First end cap and the second end cap, it is corresponding respectively to be covered on the inlet and the inlet and outlet, and with the inside
The inner wall of cavity volume encloses jointly to be set to form the closed cavity that builds the pressure；
Pressue device through the pressurization hole and for abutting and pressurizeing with the rock core, provides for the rock core containing crack
Clossing pressure and the fixed rock core；
Gas injection apparatus is connected with the inlet and outlet, is produced for injecting air-flow to the inner volume with simulating gas well
Outlet；
Reflux and pressure test probe, corresponding installation to the return port, the instrument connection, the pressure are surveyed respectively
Pin is soundd out for being abutted with the rock core and testing the pressure value in the rock core.
Preferably, the reflux includes：
Oil nozzle is simulated, is installed to the return port, the simulation oil nozzle is equipped with to control the simulation oil nozzle aperture
Eyelet switch；
Simulation wellbore hole connects on the simulation oil nozzle and with the simulation oil nozzle.
Preferably, the outer surface of the simulation oil nozzle is equipped with external screw thread, is equipped with and the external screw thread spiral shell in the return port
Connect the internal thread of cooperation.
To achieve the above object, the present invention also provides one kind for determining that gas well fracturing returns row's opportunity and proppant fracturing fluid
The logistics organizations method of regurgitant volume is used to determine that gas well fracturing to return row's opportunity and proppant fracturing fluid regurgitant volume using above-mentioned
Logistics organizations device, includes the following steps：
The rock core that proppant is equipped at crack is placed in the inner volume, adjusts the pressure value of the pressue device
The fixed rock core；
Fracturing fluid is pumped into from inlet, when the pressure of the inlet rises to goal pressure, termination of pumping simultaneously records fracturing fluid
Amount, closes the inlet,
The inlet, inlet and outlet, reflux bore closure are kept, the major fracture pressure change of the rock core is observed, with simulation
Natural fracture closure state；
It opens the gas injection apparatus and gas is injected into the inlet and outlet, while open the reflux, remember
Record major fracture pressure change, fracturing fluid recovery, proppant discharge rate.
Preferably, rock core is placed in the inner volume described, the pressure value for adjusting the pressue device is fixed
After the step of rock core, fracturing fluid is pumped into from inlet described, when the pressure of the inlet rises to goal pressure,
Termination of pumping and the step of record, close the inlet before, further include following steps：
After the air discharge in inner volume, the inner volume is closed.
Preferably, after the air discharge by inner volume, the step of closing the inner volume, specifically include：
The inlet and outlet are opened, clear water is pumped into from the inlet, the air in inner volume is discharged, described in closing
Inlet and outlet.
Preferably, the rock core is that the cut surface by manually cutting crack, and in the artificial cutting crack is laid with institute
State proppant.
After the present invention by rock core by being placed in inner volume, abutted with rock core by pressue device and pressurizeed to rock core, it is right
Rock core is fixed, and due to there is crack on rock core, pressue device or rock core provide clossing pressure；Pass through the artificial cutting of rock core
Proppant and return port are equipped in crack real simulation and to realize that proppant flows back with fracturing fluid from rock core, so that it is determined that propping up
Support agent regurgitant volume and fracturing fluid recovery；Difference can be simulated by adjusting the reflux aperture (aperture of return port) of reflux
The simulation oil of different pore size during the row of returning after pressure break is realized in blowout oil nozzle mouth footpath (being the aperture of simulation oil nozzle in the present invention)
The simulation that mouth influences fracturing fluid and proppant backflow.
Further, which adds in gas injection apparatus, realizes the simulation that journey is drained through to being returned after gas well fracturing, and can
Influence of the gas well aerogenesis to fracturing fluid proppant backflow is simulated by changing injection gas velocity.The experimental provision and experimental method
Natural fracture closure and the simulation in forced closed stage, consider proppant backflow amount and fracturing fluid recovery (backflow) after achievable pressure break
After rate, guidance instruction can be provided to the most preferably row's of returning opportunity and the row's of returning system.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Structure according to these attached drawings obtains other attached drawings.
Fig. 1 provides an embodiment for determining that gas well fracturing returns row's opportunity and proppant fracturing fluid regurgitant volume for the present invention
The sectional view of logistics organizations device；
Fig. 2 is the partial schematic diagram of one embodiment of reflux in Fig. 1；
Fig. 3 is the partial schematic diagram of one embodiment of the second end cap in Fig. 1；
Fig. 4 is partial schematic diagram of the rock core when cutting forms single crack in Fig. 1；
Fig. 5 is partial schematic diagram of the rock core when cutting forms combination crack in Fig. 1.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 1 | Cylindrical body | 3 | Second end cap |
| 11 | Inner volume | 4 | Reflux |
| 12 | Inlet | 41 | Simulate oil nozzle |
| 13 | Inlet and outlet | 42 | Simulation wellbore hole |
| 14 | Return port | 5 | Pressure test probe |
| 15 | Instrument connection | 200 | Rock core |
| 2 | First end cap |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each component,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, " first ", " second " etc. are somebody's turn to do
Description be only used for description purpose, and it is not intended that instruction or implying its relative importance or implicit indicating indicated skill
The quantity of art feature." first " is defined as a result, and the feature of " second " can be expressed or implicitly includes at least one spy
Sign.In addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, the knot of this technical solution is will be understood that when the combination appearance of technical solution is conflicting or can not realize
Conjunction is not present, also not the present invention claims protection domain within.
(experimental provision)
Present invention proposition is a kind of to be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Device please refers to Fig.1 to Fig.3, described to be used to determine that gas well fracturing returns row's opportunity and the object mould of proppant fracturing fluid regurgitant volume is real
Experiment device includes cylindrical body 1, the first end cap 2 and the second end cap 3,4 and of pressue device, gas injection apparatus and reflux
Pressure test probe 5, cylindrical body 1 have place for rock core 200 inner volume 11, positioned at both ends and respectively with the inside
The inlet 12 and inlet and outlet 13 and be arranged on side and the reflux connected respectively with the inner volume 11 that cavity volume 11 connects
Hole 14, instrument connection 15 and pressurization hole；First end cap 2 and the second end cap 3 respectively it is corresponding be covered on the inlet 12 and it is described into
Outlet 13, and enclose to set jointly to form the closed cavity that builds the pressure with the inner wall of the inner volume 11；Pressue device adds through described
It presses hole and for abutting and pressurizeing with the rock core 200, clossing pressure and the fixed rock core is provided for the rock core 200 containing crack
200；Gas injection apparatus is connected with the inlet and outlet 13, for simulating gas well output to the inner volume 11 injection air-flow
Gas；Reflux 4 and pressure test probe 5 correspond to installation to the return port 14 and the instrument connection 15, the pressure respectively
Test probe 5 is used to abut with the rock core 200 and test the pressure value in the rock core 200.Preferably, the rock core 200
That cut surface by manually cutting crack, and in the artificial cutting crack is laid with the proppant, by rock core 200 into
Pedestrian's work is cut, and can be simulated different fracture patterns, be realized influence of the different fracture patterns to the row of returning after pressure break.
During installation, pressure test probe 5 is abutted with the major fracture of rock core 200, can be tested by pressure test probe 5
The pressure of 200 major fracture of rock core.It, can be with after the first end cap 2 and the second end cap 3 correspond to and be mounted on inlet 12 and inlet and outlet 13
Sealing function is played, the cavity that builds the pressure for forming sealing builds the pressure to simulate pressure break termination of pumping pressure.
Wherein inlet and outlet 13 be connecteds with inlet and outlet 13 in gas injection apparatus and when opening, import and export 13 conduct gases into
Mouthful, and when importing and exporting 13 openings and gas injection apparatus is not opened, inlet and outlet 13 are used as liquid outlet.
Although the reflux of proppant can be simulated in the prior art, it can not realize and build the pressure, therefore stop after pressure break can not be simulated
Pump pressure.And the row of returning of fracturing fluid is only accounted in pertinent literature, do not consider proppant backflow.Simultaneously for gas well output gas
The row's of returning opportunity is not related to also with the correlative study that the row of returning system optimizes after effect pushes.
After the present invention by rock core 200 by being placed in inner volume 11, abutted by pressue device with rock core 200 and to rock core
200 pressurizations, fix rock core 200, and due to there is crack on rock core 200, pressue device or rock core 200, which provide, is closed pressure
Power；Real simulation and proppant and pressure can be realized by being equipped with proppant and return port 14 in the artificial cutting crack of rock core 200
It splits liquid to flow back from rock core 200, so that it is determined that proppant backflow amount and fracturing fluid recovery；It can be by adjusting reflux 4
Reflux aperture (aperture of return port 14) can simulate different blowout oil nozzle mouth footpaths (being in the present invention the aperture of simulation oil nozzle 41),
The simulation that the simulation oil nozzle 41 of different pore size influences fracturing fluid and proppant backflow during the row of returning after realization pressure break.
In the present embodiment, the reflux 4 includes simulation oil nozzle 41 and simulation wellbore hole, simulation oil nozzle 41 install to
The return port 14, the simulation oil nozzle 41 are equipped with to control the eyelet switch of simulation 41 aperture of oil nozzle；Simulate well
Cylinder is mounted on the simulation oil nozzle 41 and is connected with the simulation oil nozzle 41.Since eyelet switch can adjust simulation oil nozzle 41
Aperture, reflux aperture is controlled with this, simulates what the aperture of different simulation oil nozzles 41 influenced fracturing fluid and proppant backflow
Simulation.Preferably, simulation wellbore hole is set upward during installation, and simulation oil nozzle 41 is horizontally disposed, in this way, can be in simulation wellbore hole
Simple and reliable in order to which simulation oil nozzle 41 is made to be connected with return port 14, the outer surface of the simulation oil nozzle 41 is equipped with outer
Screw thread, the interior internal thread being equipped with external thread bolt connection cooperation of the return port 14.
(experimental method)
Present invention proposition is a kind of to be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Method is used to determine that gas well fracturing returns the logistics organizations device on row's opportunity and proppant fracturing fluid regurgitant volume, the use using above-mentioned
Row's opportunity is returned in definite gas well fracturing and the logistics organizations method of proppant fracturing fluid regurgitant volume includes the following steps：
The rock core 200 that proppant is equipped at crack is placed in the inner volume 11 by step S210, adjusts described add
The pressure value of pressure device fixes the rock core 200.
Rock core 200 can be selected according to specific requirement (lithology, permeability and porosity including rock core 200) in experiment
It selects, can select the rock core 200 of different lithology, different permeability and Different porosities by required fracture pattern to rock core 200
It is cut.
Wherein, proppant is equipped with described in the step S210 at crack, can be behind manually cutting crack, cut
Face lays proppant, and the wherein laying concentration of proppant, proppant grain size can be designed according to specific experiment and determined.
In the specific implementation, it is put into after rock core 200 is closed in inner volume 11 and rock core 200 is provided with pressue device
Clossing pressure.
Proppant is set at the crack of rock core 200, convenient for determining that gas well fracturing returns row's opportunity and proppant and fracturing fluid
Regurgitant volume, and then convenient for influence of the research aerogenesis speed to the row's of returning opportunity and rational pressure break is counter arranges system.
Preferably, the rock core 200 is that the cut surface by manually cutting crack, and in the artificial cutting crack is laid with
The proppant.By manually being cut to rock core 200, different fracture patterns can be simulated, realizes different fracture patterns pair
The influence for the row of returning after pressure break.
Step S220 is pumped into fracturing fluid from inlet 12, when the pressure of the inlet 12 rises to goal pressure, termination of pumping
And pressure break liquid measure is recorded, close the inlet 12.
Wherein, in the step S220, the pressure for treating the inlet 12 is risen in goal pressure, the target pressure
Power is the pressure that determines of experimental design, which stops after pressure break termination of pumping pressure is reached it is also assumed that be pressure break termination of pumping pressure
It pumps and records pressure break liquid measure.
Preferably, between step S220 and step S210, further include：
After the air discharge in inner volume 11, the inner volume 11 is closed.
In the specific implementation, after the air discharge by inner volume 11, the step of closing inner volume 11
Including：The inlet and outlet 13 are opened, clear water is pumped into from the inlet 12, the air in inner volume 11 is discharged, are closed
The inlet and outlet 13.
The inlet and outlet 13 are being opened, when being pumped into clear water from the inlet 12, at this point, in the crack of the rock core 200
It equipped with proppant, is installed in the rock core 200 to the inner volume 11, fracturing fluid flows into the inside by inlet 12
After cavity volume 11, it is only capable of flowing to the inlet and outlet 13 by the crack in the rock core 200.
Specifically, in order to ensure that fracturing fluid after inlet 12 flows into the inner volume 11, is only capable of through the rock
Crack in the heart 200 flow to it is described inlet and outlet 13, after the rock core 200 is placed in the inner volume 11, the rock core 200 with
Tight fit between the inner wall of the inner volume 11, so that fracturing fluid is after inlet 12 flows into the inner volume 11, only
The inlet and outlet 13 can be flow to by the crack in the rock core 200.In this way, fracturing fluid flows into the internal appearance in inlet 12
After chamber 11, it is impossible to flow directly out to the inlet and outlet 13 and have to pass through the crack in rock core 200, improve experiment effect.
Step S230 keeps the inlet 12, inlet and outlet 13, return port 14 to close, and the master for observing the rock core 200 is split
Pressure change is stitched, with simulation fracture Natural closure state；
Pass through the Natural closure time after inlet 12, inlet and outlet 13,14 shut-in time of return port simulation pressure.
In the specific implementation, the opening and closing of return port 14 is by the aperture of reflux 4, particular by simulation oil nozzle 41
Aperture adjust.
Step S240 opens the gas injection apparatus and gas is injected into the inlet and outlet 13, while described in unlatching
Reflux 4, record major fracture pressure change, fracturing fluid recovery, proppant discharge rate.
Natural fracture closure state is usually required before step S240 is performed and is kept for a period of time, can be 0min,
10min, 20min, 30min ..., the specific time determines according to specific needs, is not limited herein.
It is opening the gas injection apparatus and is injecting gas into the inlet and outlet 13, will injected in inner volume 11
Gas opens reflux 4, and rock core 200 enters crack forced closed state at this time.
By the injection rate of total fracturing fluid, calculate the row of returning with reference to the fracturing fluid recovery recorded in step S240 and lead and pressure break
Liquid filter loss can determine the optimal row's of returning opportunity and the row's of returning system in conjunction with fracturing fluid leak amount and proppant discharge rate.According to this
The above provided is provided, different reservoir physical property, pressure break termination of pumping pressure, confining pressure, fracture pattern, proppant grain can be simulated
Returning when footpath, fracturing fluid viscosity, blowout oil nozzle mouth footpath, reservoir aerogenesis speed is drained through journey.
Technical scheme is described in further detail below in conjunction with specific embodiment, it should be understood that following real
Example is applied only to explain the present invention, is not intended to limit the present invention.
The row's of returning logistics organizations method after embodiment gas well pressure
(1) preparation stage：Rock core 200 needed for preparing experiment, rock core 200 can select different lithology, no according to requirement of experiment
Same permeability, Different porosities cut rock core 200 by required fracture pattern；
(2) 200 cut surface of rock core lays proppant and (determines laying concentration, proppant grain according to experimental design after dicing
Footpath), it is closed rock core 200 and puts it into inner volume 11,12 He of inlet is closed by the first end cap 2 and the second end cap 3
Inlet and outlet 13；
(3) clear water will be packed into intermediate receptacle, the pressure of pressue device is set to adjust the closure pressure that rock core 200 is subject to
Power opens inlet 12, inlet and outlet 13,2PV clear water is pumped into inlet 12, so as to discharge the air in inner volume 11, and
Inlet and outlet 13 are closed afterwards；
(4) turn on pump again is pumped into fracturing fluid, 12 pressure change of inlet is observed, after pressure rises to experimental design pressure
(pressure is regarded as pressure break termination of pumping pressure), termination of pumping, record is pumped into pressure break liquid measure, and closes inlet 12；
(5) inlet 12, inlet and outlet 13, return port 14 is kept to close, observes major fracture pressure change, simulation fracture is natural
Closure state；
(6) close after a certain period of time (0min, 10min, 20min, 30min ... ...), gas note is installed at inlet and outlet 13
Enter device, gas is internally injected in cavity volume 11, open return port 14, at this time into the crack forced closed stage, record master is split
Stitch pressure change, fracturing fluid recovery, proppant discharge rate.
(7) by the injection rate of total fracturing fluid, the fracturing fluid recovery calculating row of returning with reference to record in (6) leads and fracturing fluid
Filter loss can determine the optimal row's of returning opportunity and the row's of returning system in conjunction with fracturing fluid leak amount and proppant discharge rate.
It is described in detail below in conjunction with specific example.
Example 1
Difference was returned under row's opportunity after simulation gas well fracturing, proppant backflow amount and fracturing fluid reflux ratio.
S1, identical lithology, permeability, porosity rock core 200 take 3 pieces needed for preparing experiment, labeled as No. 1 rock core 200,2
Number rock core 200 and No. 3 rock cores 200, cut rock core 200 by the single cracks of Fig. 4；
S2, the cut surface of rock core 200 after dicing lay same concentrations, same particle size proppant, are closed No. 1 rock core
It 200 and puts it into inner volume 11, closes inlet 12 and inlet and outlet 13；
S3 will be packed into clear water in intermediate receptacle, set the pressure of pressue device to adjust the closure pressure that rock core 200 is subject to
Power opens system inlet 12, inlet and outlet 13, is pumped into 2PV clear water, so as to discharge air in inner volume 11, then close into
Outlet 13；
S4, turn on pump, is pumped into fracturing fluid again, 12 pressure change of inlet is observed, after pressure rises to experimental design pressure
(pressure is regarded as pressure break termination of pumping pressure), termination of pumping, record is pumped into pressure break liquid measure, and closes system inlet 12；
S5 keeps inlet 12, inlet and outlet 13, return port 14 to close, and observes major fracture pressure change, and simulation fracture is natural
Closure state；
S6 after inlet 12, inlet and outlet 13, return port 14 is kept to close 10min, installs gas injection at inlet and outlet 13
Device internally injects gas in cavity volume 11, open return port 14, at this time into the crack forced closed stage, records major fracture
Pressure change, fracturing fluid recovery, proppant discharge rate；
S7 takes No. 2 rock cores 200, and step S2-S5 is repeated to No. 2 rock cores 200, keeps inlet 12, inlet and outlet 13, reflux
After 30min is closed in hole 14, gas injection apparatus at inlet and outlet 13 is installed, gas is internally injected in cavity volume 11, opens reflux
Hole 14, at this time into crack forced closed stage, record major fracture pressure change, fracturing fluid discharge rate, proppant discharge rate；
S8 takes No. 3 rock cores 200, repeats step 2-5, and inlet 12, inlet and outlet 13, return port 14 is kept to close until seeing
It observes pressure at pressure tap and is equal to fracture closure pressure (pressure that i.e. 11 pressue device of inner volume provides rock core 200),
Installation gas injection apparatus at 13 is imported and exported, gas is internally injected in cavity volume 11, opens return port 14, it is strong into crack at this time
Close stage processed, record major fracture pressure change, fracturing fluid recovery, proppant discharge rate；
Acquired fracturing fluid recovery, proppant discharge rate determine gas well pressure in S9, comparative analysis step S6, S7, S8
It splits rear difference and returns proppant backflow amount and fracturing fluid reflux ratio under row's opportunity, analyze the row of returning too early and return row to fracturing reform with hysteresis
Influence, so as to obtain the optimal row's of returning opportunity.
Example 2
When using simulation oil nozzle 41 (aperture of return port 14) of different pore size after simulation gas well fracturing, proppant backflow amount
With fracturing fluid reflux ratio.
S1, identical lithology, permeability, porosity rock core 200 take 3 pieces needed for preparing experiment, by the single cracks of Fig. 4 to rock core
200 are cut；
S2, installation aperture are 1mm containing externally threaded simulation oil nozzle 41 (maximum opening of return port 14 is 1mm at this time)；
S3,200 cut surface of rock core laying same concentrations, same particle size proppant, are closed No. 1 rock core 200 simultaneously after dicing
It puts it into inner volume 11, closes inlet 12 and inlet and outlet 13；
S4 will be packed into clear water in intermediate receptacle, set 11 clossing pressure of inner volume, open inlet 12, inlet and outlet 13,
2PV clear water is pumped into, so as to discharge air in inner volume 11, then closes inlet and outlet 13；
S5, turn on pump, is pumped into fracturing fluid again, 12 pressure change of inlet is observed, after pressure rises to experimental design pressure
(pressure is regarded as pressure break termination of pumping pressure), termination of pumping, record is pumped into pressure break liquid measure, and closes system inlet 12；
S6 keeps inlet 12, inlet and outlet 13, return port 14 to close, and observes major fracture pressure change, and simulation fracture is natural
Closure state；
S7 keeps inlet 12, inlet and outlet 13, return port 14 to close until observing that pressure is closed equal to crack at pressure tap
Resultant pressure (the pressure inner volume 11 that i.e. pressue device provides rock core 200) installs gas injection apparatus at inlet and outlet 13,
Gas is internally injected in cavity volume 11, opens return port 14, at this time into the crack forced closed stage, record major fracture pressure becomes
Change, fracturing fluid recovery, proppant discharge rate；
S8, the simulation oil nozzle 41 containing external screw thread (maximum opening of return port 14 is 2mm at this time) that installation aperture is 2mm, weight
Multiple step S3-S7, obtains fracturing fluid discharge rate, proppant discharge rate；
S9, the simulation oil nozzle 41 containing external screw thread (maximum opening of return port 14 is 3mm at this time) that installation aperture is 3mm, weight
Multiple step S3-S7, obtains fracturing fluid discharge rate, proppant discharge rate；
Acquired fracturing fluid recovery, proppant discharge rate determine gas well pressure in S10, comparative analysis step S7, S8, S9
It splits under the simulation oil nozzle 41 of rear different pore size, proppant backflow amount and fracturing fluid reflux ratio, so that it is determined that the simulation of optimum aperture
Oil nozzle 41.
Be in this example directly by replacing the simulation oil nozzle 41 of different pore size, in other embodiments can also be by changing
Become the aperture of simulation oil nozzle 41, determine the simulation oil nozzle 41 of optimal aperture.
Fig. 5 shows partial schematic diagram of the rock core when cutting forms combination crack, since principle is identical with examples detailed above,
It does not illustrate herein.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every in the present invention
Inventive concept under, the equivalent structure transformation made using description of the invention and accompanying drawing content or directly/be used in it indirectly
His relevant technical field is included in the scope of patent protection of the present invention.
Claims (7)
1. a kind of for determining that gas well fracturing returns the logistics organizations device on row's opportunity and proppant fracturing fluid regurgitant volume, feature exists
In, including：
Cylindrical body has the inner volume placed for rock core, positioned at both ends and the feed liquor that is connected respectively with the inner volume
Mouth and inlet and outlet and the return port for being arranged on side and being connected respectively with the inner volume, instrument connection and pressurization hole；
First end cap and the second end cap, it is corresponding respectively to be covered on the inlet and the inlet and outlet, and with the inner volume
Inner wall enclose jointly and set to form the closed cavity that builds the pressure；
Through the pressurization hole and for abutting and pressurizeing with the rock core, closure is provided for the rock core containing crack for pressue device
Pressure and the fixed rock core；
Gas injection apparatus is connected with the inlet and outlet, for simulating gas well output gas to inner volume injection air-flow；
And
Reflux and pressure test probe, respectively corresponding installation to the return port and the instrument connection, the pressure test
Probe is used to abut with the rock core and test the pressure value in the rock core.
2. as described in claim 1 be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Device, which is characterized in that the reflux includes：
Oil nozzle is simulated, is installed to the return port, the simulation oil nozzle is equipped with to control the hole of the simulation oil nozzle aperture
Eye switch；And
Simulation wellbore hole connects on the simulation oil nozzle and with the simulation oil nozzle.
3. as claimed in claim 2 be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Device, which is characterized in that the outer surface of the simulation oil nozzle is equipped with external screw thread, is equipped with and the external screw thread spiral shell in the return port
Connect the internal thread of cooperation.
4. it is a kind of for determining that gas well fracturing returns the logistics organizations method on row's opportunity and proppant fracturing fluid regurgitant volume, using such as power
Profit requires to be used to determine that gas well fracturing to return row's opportunity and the object mould of proppant fracturing fluid regurgitant volume is real described in 1 to 3 any one
Experiment device, which is characterized in that include the following steps：
The rock core that proppant is equipped at crack is placed in the inner volume, the pressure value for adjusting the pressue device is fixed
The rock core；
Fracturing fluid is pumped into from inlet, when the pressure of the inlet rises to goal pressure, termination of pumping simultaneously records pressure break liquid measure, closes
Close the inlet；
The inlet, inlet and outlet, reflux bore closure are kept, the major fracture pressure change of the rock core is observed, with simulation fracture
Natural closure state；
It opens the gas injection apparatus and gas is injected into the inlet and outlet, while open the reflux, record master
Fracture pressure variation, fracturing fluid recovery, proppant discharge rate.
5. as claimed in claim 4 be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Method, which is characterized in that rock core is placed in the inner volume described, the pressure value for adjusting the pressue device is fixed
After the step of rock core, fracturing fluid is pumped into from inlet described, when the pressure of the inlet rises to goal pressure,
Termination of pumping and the step of record, close the inlet before, further include following steps：
After the air discharge in inner volume, the inner volume is closed.
6. as claimed in claim 5 be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Method, which is characterized in that after the air discharge by inner volume, the step of closing the inner volume, specifically include：
The inlet and outlet are opened, clear water is pumped into from the inlet, the air in inner volume is discharged, closes the disengaging
Mouthful.
7. as claimed in claim 4 be used to determine that gas well fracturing returns the logistics organizations on row's opportunity and proppant fracturing fluid regurgitant volume
Method, which is characterized in that the rock core is that the cut surface by manually cutting crack, and in the artificial cutting crack is laid with institute
State proppant.
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