CN105527379B - Three hole rock core kettles, Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision and method - Google Patents
Three hole rock core kettles, Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision and method Download PDFInfo
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- CN105527379B CN105527379B CN201610003898.7A CN201610003898A CN105527379B CN 105527379 B CN105527379 B CN 105527379B CN 201610003898 A CN201610003898 A CN 201610003898A CN 105527379 B CN105527379 B CN 105527379B
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- 239000011435 rock Substances 0.000 title claims abstract description 143
- 239000007788 liquid Substances 0.000 title claims abstract description 105
- 230000035699 permeability Effects 0.000 title claims abstract description 51
- 230000006378 damage Effects 0.000 title claims abstract description 28
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 102
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 77
- 238000012360 testing method Methods 0.000 claims abstract description 53
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 34
- 238000002474 experimental method Methods 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000000994 depressogenic effect Effects 0.000 claims description 25
- 239000003822 epoxy resin Substances 0.000 claims description 20
- 229920000647 polyepoxide Polymers 0.000 claims description 20
- 239000005662 Paraffin oil Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 239000012224 working solution Substances 0.000 claims description 5
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical group C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 230000009182 swimming Effects 0.000 claims 1
- 238000000502 dialysis Methods 0.000 abstract description 5
- 208000027418 Wounds and injury Diseases 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 208000014674 injury Diseases 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000011109 contamination Methods 0.000 abstract 1
- 238000011161 development Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 231100000053 low toxicity Toxicity 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- -1 acrylic compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
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Abstract
The present invention is a kind of three holes rock core kettle, Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision and method, and three hole rock core kettles clamp core sample using lid up and down, and being respectively equipped with through hole on lid up and down is communicated to core sample surface.Experimental provision includes three hole rock core kettles, upstream simulated formation fluid intermediate receptacle, downstream simulation formation fluid intermediate receptacle and testing liquid intermediate receptacle, plunger pump, vavuum pump and nitrogen cylinder；Connected between all parts by pipeline, and provided with corresponding control valve, gas pressure regulating valve and back-pressure valve.Experimental method makes the simulation reservoir fluid of the identical activity of core sample upper and lower surface contact, reservoir fluid is simulated simultaneously in upper surface constant flow, dialysis pressure transmission is eliminated, is changed with time by monitoring downstream liquid pressure, the permeability before and after sample contamination is tried to achieve and then evaluates extent of injury.The three hole rock core kettles of the present invention are simple in construction, and experimental provision and method are easy to use, reduce test pressure, and experimental data is reliable.
Description
Technical field
The present invention be on a kind of oil and gas reservoir damage assessment technique, more particularly to a kind of three holes rock core kettle,
Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision and method.
Background technology
At present, hypotonic, special hypotonic reserves account for 2/3rds or so ratio in explored oil and gas reserves, hypotonic, super
Hypotonic reserves will be exploration and development emphasis that China's oil yield is taken over, be also difficult point.It is low in exploration and development production process
Ooze, Oil in Super-low Permeability Reservoirs is more prone to come to harm than the middle and high reservoir that oozes during production operation, also, reservoir comes to harm
The harmfulness brought afterwards is bigger, to release injury also more difficult.So, the exploration and development effect of ultra-permeable reservior is improved,
The protection work of reservoir is extremely important.Oil in Super-low Permeability Reservoirs liquid damage evaluation experiment be Oil in Super-low Permeability Reservoirs protection work basis and
Foundation.
In current Oil in Super-low Permeability Reservoirs liquid damage evaluation, people are also the middle and high infiltration storage that simply follows conventional lines
The evaluation method of layer, i.e., the SY/T 5358-2010 of revision in 2010《Reservoir sensitivity flowing experiment evaluation method》.SY/T
Explicitly pointed out in 5358-2010 standards, the standard is applied to air permeability and is more than 1 × 10-3um2Clastic reservoir rock rock sample
Sensitivity assessment experimental method, and Oil in Super-low Permeability Reservoirs perm-plug method is generally below 1 × 10-3um2, using above-mentioned evaluation method meeting
There is following problem：On the one hand, it is necessary to which very high displacement pressure difference and very long flow speed stability time, very high to equipment requirement, to ooze
Saturating rate is 0.1 × 10-3um2Exemplified by rock sample, it is in 2.54 centimetres of diameter, 5 centimetres of length, the ml/min of flow 1, displacing medium
Under water condition, displacement pressure difference is more than 16MPa, and the flow velocity basicly stable time needs more than 5 hours.On the other hand, it is this to be based on darcy
The steady method of law, mainly calculates corresponding permeability, current flow measurement by determining the flow under limit
Method is influenceed larger by environment and human factor, for ultra-permeable reservior, and the steady state flow in experimentation is very low, and this enters
One step adds metering difficulty and error.
In addition, super-low permeability reservoir has certain semi-transparent membrane property, that is, allow hydrone and a part of lewis' acid
Pass through, in its certain osmotic pressure of both sides induced synthesis, existing liquid surveys the influence that permeability method usually not considers osmotic pressure,
This can further increase the error of permeability determination and reservoir damage evaluation result.
Thus, the present inventor relies on is engaged in experience and the practice of relevant industries for many years, proposes a kind of three holes rock core kettle, ultralow
Reservoir liquid damage evaluation experimental provision and method are oozed, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of three holes rock core kettle, Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision and side
Method, disclosure satisfy that evaluation requirement of the working solution to the Oil in Super-low Permeability Reservoirs extent of damage, and experimental rig is simple, process of the test simple,
Test data is reliable.
The object of the present invention is achieved like this, and a kind of three holes rock core kettle, the three holes rock core kettle includes：
Upper cover body, the lower surface of the upper cover body be provided with the first groove, the upper cover body provided with its upper surface of insertion with
The first through hole and the second through hole of first groove；
Lower cover, the upper surface of the lower cover, which is provided with depressed part, the lower cover, is provided with its lower surface of insertion and institute
State the third through-hole of depressed part；The bottom surface of the depressed part is provided with the second groove, and the third through-hole connects with second groove
It is logical；
Core sample, the middle part of the core sample is rock core, and the side wrap of the rock core has epoxy resin；The rock
Heart sample be embedded in the depressed part and with the form fit of the depressed part, the thickness of the core sample and the depression
The depth in portion is identical；
The lower surface of the upper cover body is fastened on the upper surface of the lower cover and is bolted；The rock core
Upper surface abuts first groove；Upper gap is formed between the upper surface of first groove and the rock core；The rock core
Lower surface abut lower gap formed between second groove, the lower surface of second groove and the rock core.
In the better embodiment of the present invention, the rock core is discoid, and the epoxy resin is wrapped in the rock
The circumference side of the heart；First groove, second groove and the depressed part are circle.
In the better embodiment of the present invention, the position that the first through hole lower end is connected with first groove is set
Have a crisscross communication groove, the communication groove is arranged on the top surface of first groove, the first through hole with it is described
Communication groove is connected.
In the better embodiment of the present invention, between the epoxy resin and the upper cover body, the epoxy resin
Sealing ring is equipped between the bottom surface of the depressed part to be sealed.
In the better embodiment of the present invention, the upper cover body and the lower cover are what stainless steel material was made
Cylindrical, the third through-hole is located at the center of the lower cover；
The upper cover body and the lower cover are distributed and the corresponding perforation in position, connecting bolt provided with multiple even circumferentials
It is each passed through the perforation and the upper cover body and the lower cover is connected by nut.
The purpose of the present invention can also be achieved in that, a kind of Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision, the reality
Experiment device includes the three holes rock core kettle, and the experimental provision also includes upstream simulated formation fluid intermediate receptacle, downstream and simulated
Formation fluid intermediate receptacle and testing liquid intermediate receptacle；
The of the first end of the upstream simulated formation fluid intermediate receptacle, downstream simulation formation fluid intermediate receptacle
One end connects plunger pump by pipeline respectively；The first through hole is connected by pipeline to be held in the middle of the upstream simulated formation fluid
Second end of device；The third through-hole connects the second end and vacuum that formation fluid intermediate receptacle is simulated in the downstream by pipeline
Pump；Second through hole connects the first end, the first end of back-pressure valve and vacuum of the testing liquid intermediate receptacle by pipeline
Pump；Second end of the back-pressure valve connects waste liquid cylinder by pipeline；The 3rd end, the testing liquid centre of the back-pressure valve hold
Second end of device connects gas pressure regulating valve by pipeline, and the gas pressure regulating valve connects nitrogen cylinder.
In the better embodiment of the present invention, first pressure transmitter is connected with the third through-hole；Described
Two through holes are connected with second pressure transmitter；The three-terminal link of the back-pressure valve has the 3rd pressure transmitter.
In the better embodiment of the present invention, hold in the middle of the three holes rock core kettle, the upstream simulated formation fluid
Device, downstream simulation formation fluid intermediate receptacle and the testing liquid intermediate receptacle are arranged in insulating box.
In the better embodiment of the present invention, the upstream simulated formation fluid intermediate receptacle includes a cylinder, institute
State and piston is provided with cylinder, the inside of the cylinder is separated into first chamber and second chamber, first chamber by the piston
Room is located at first end, and the second chamber is located at the second end；
The structure and the upstream mould of the downstream simulation formation fluid intermediate receptacle and the testing liquid intermediate receptacle
The structure for intending formation fluid intermediate receptacle is identical.
In the better embodiment of the present invention, each described pipeline is provided with the control for controlling the respective line break-make
Valve.
The purpose of the present invention can also be achieved in that one kind uses the Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision
Experimental method, the experimental method includes：
S1, prepares the core sample, and prepare and original void fluid activity identical simulated formation fluid；
S2, loads the three holes rock core kettle, by the vavuum pump and the threeway by the core sample prepared
Pipeline connection between hole, second through hole, remaining connecting line is turned off；Start the vavuum pump to vacuumize；
S3, the plunger pump, the downstream is simulated the pipeline between formation fluid intermediate receptacle and the third through-hole
Connection, remaining connecting line is turned off；The plunger pump injects working solution to set pressure to the third through-hole, and pressure is steady
Postscript is determined for downstream initial pressure P0；P0Should be identical with rock sample original pore pressure；
S4, the plunger pump, the upstream simulated formation fluid intermediate receptacle, the first through hole and described second are led to
Pipeline connection between hole, the back-pressure valve, the gas pressure regulating valve, the nitrogen cylinder, remaining connecting line is turned off；Make
The simulated formation fluid is in rock core upper surface constant flow, the pressure of rock core lower surface, Zhi Daosuo described in continuous monitoring
The pressure for stating rock core lower surface is equal to the pressure of the rock core upper surface；The first liquid is calculated using the relation between each pressure to survey
Permeability k1；
S5, by between second through hole, the testing liquid intermediate receptacle, the gas pressure regulating valve and the nitrogen cylinder
Pipeline connection, remaining connecting line is turned off；Adjust the gas pressure regulating valve sets pressure as 4.5MPa, in the pressure
The lower testing liquid by the testing liquid intermediate receptacle is pushed into the upper surface of the rock core and continues 5 hours；
S6, the liquid of duplicate measurements first surveys permeability k1Step S3 to step S4, measure the rock core by the prepare liquid
The second liquid after body pollution surveys permeability k2；Permeability k is surveyed by the first liquid1Permeability k is surveyed with the second liquid2Value calculate described
Loss ratio λ of the testing liquid to the rock cored。
In the better embodiment of the present invention, the core sample is prepared in step S1 and is comprised the following steps：
The first step, exists side by side in well head coring and quarter wraps up rock core with Polythene Bag, is put into sealing bucket and preserves；
Second step, the rock core is put into paraffin oil, and a diameter of 2 inches, length are then drilled through with rig and paraffin oil
For 4 inches of core column；
3rd step, 1 is pressed by epoxide-resin glue and curing agent：1 ratio is sufficiently mixed, be subsequently poured into external diameter for 2.5 inches, it is interior
In the heat resistant plastice pipe that footpath is 2.125 inches, length is 8 inches；
4th step, the core column is put into the heat resistant plastice pipe, and the core column is placed in the resistance to thermoplastic
Expects pipe center, stands 24 hours；
5th step, the core column and the heat resistant plastice pipe are placed in baking oven, are heated 1 hour under the conditions of 110 DEG C；
The core column for wrapping up epoxide-resin glue, the thin slice of 0.25 inch is cut to annular saw and paraffin oil by the 6th step
The core sample is made, the core sample is placed in paraffin oil and preserved.
In the better embodiment of the present invention, in step sl, it is 0.85 to test original pore-fluid water activity, and
Prepare and simulate reservoir fluid KCl solution with archioporus clearance flow volume activity identical.
In the better embodiment of the present invention, by the upstream simulated formation fluid intermediate receptacle and the downstream mold
Filled in the first chamber for intending formation fluid intermediate receptacle for transmit the plunger pump driving force distilled water, in second chamber
Fill the simulated formation fluid；
It is used for filling to fill in the testing liquid, second chamber in the first chamber of the testing liquid intermediate receptacle
Transmit the nitrogen of the nitrogen cylinder driving force.
In the better embodiment of the present invention, the connection and closing of respective line are controlled by the control valve.
In the better embodiment of the present invention, the downstream is measured by the first pressure transmitter in step S3
Initial pressure P0；The pressure of rock core upper surface described in step S4 is flowing pressure Pm, the back-pressure valve pressure be back pressure Pb、
The pressure of the rock core lower surface is P (l, t), PmMore than Pb；PmMeasured by the second pressure transmitter, PbBy the described 3rd
Pressure transmitter measurement；P (l, t) is measured by the first pressure transmitter；Calculate first liquid and survey permeability k1Formula
For：
Wherein：The viscosity of μ-fluid, mPas；
β-hydrostatic compression ratio, MPa-1；
V- rock cores lower end enclosed fluid volume (assuming that upper end fluid volume is infinitely great), cm3；
L- rock core length, cm；
The cross-sectional area of A- rock cores, cm2；
Δ t- time differences, s；
P (l, t)-rock sample lower end t pressure, MPa.
In the better embodiment of the present invention, second liquid is calculated in step S6 and surveys permeability k2Formula and step
First liquid, which is calculated, in rapid S4 surveys permeability k1Formula it is identical, variable P therein0、Pm, P (l, t) corresponding be the rock
Heart value measured after being polluted by testing liquid.
In the better embodiment of the present invention, the loss ratio λ of the rock core is calculateddFormula be：
From the above mentioned, three hole rock core kettles of the invention are simple in construction, and experimental provision is easy to use, by making on core sample
Lower surface contacts the simulated formation fluid of identical activity, and fluid eliminates dialysis pressure transmission in upper surface constant flow, with
Make to only exist hydraulic pressure transmission between core sample upstream and downstream, and then monitoring downstream liquid pressure changes with time.The experiment
Method significantly reduces test pressure, and eliminates dialysis pressure, and experimental data is reliable, therefore is particularly suitable for use in Oil in Super-low Permeability Reservoirs liquid
Body damage evaluation, is that such reservoir working solution preferably provides foundation.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1：For the structural representation of three holes rock core kettle of the invention.
Fig. 2：For the upward view of upper cover body in three holes rock core kettle of the invention.
Fig. 3：For the sectional view of Section A-A in Fig. 2.
Fig. 4：For the partial enlarged drawing in Fig. 2 I.
Fig. 5：For the partial enlarged drawing in Fig. 3 II.
Fig. 6：For the top view of lower cover in three holes rock core kettle of the invention.
Fig. 7：For the sectional view of section B-B in Fig. 6.
Fig. 8：Partial enlarged drawing at III in Fig. 7.
Fig. 9：For the structural representation of core sample in three holes rock core kettle of the invention.
Figure 10：For the sectional view in C-C sections in Fig. 9.
Figure 11：For the structural representation of experimental provision of the present invention.
Figure 12：For the change of the rock core downstream pressure and rock core upstream pressure before contaminated of rock core in experimental method of the present invention
Figure.
Figure 13：For the change of the rock core downstream pressure and rock core upstream pressure after contaminated of rock core in experimental method of the present invention
Figure.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now control illustrates this hair
Bright embodiment.
Embodiment 1
As shown in figure 1, the invention provides a kind of three holes rock core kettle 100, for core sample is clamped wherein to enter
Row experiment, three hole rock core kettles 100 include upper cover body 10, lower cover 20, core sample 30.Upper cover body 10 is made up of use stainless steel
Cylinder, a diameter of 3.86 inches of upper cover body 10, thickness be 1.25 inches.As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, upper lid
The lower surface of body 10 is located at the center position of upper cover body 10, upper cover body 10 provided with the first circular groove 101, the first groove 101
The interior through hole 103 of first through hole 102 and second provided with its upper surface of insertion with the first groove 101.First through hole 102 and second is led to
Hole 103 can be formed by the method drilled in upper cover body 10, and the aperture of the through hole 103 of first through hole 102 and second is 1/16
Inch.The through hole 103 of first through hole 102 and second is set on the Central Symmetry of upper cover body 10.
Lower cover 20 is also the cylinder being made of stainless steel, and its diameter and thickness are identical with upper cover body 10.Such as Fig. 6 and
Shown in Fig. 7, the upper surface of lower cover 20 is provided with circular depressed part 201, and the depressed part 201 is being located at the upper surface of lower cover 20 just
In, a diameter of 2.5 inches of depressed part 201, depth be 0.25 inch.The depressed part 201 is used to place core sample 30.Lower cover
Provided with the third through-hole 202 that depressed part 201 is penetrated into from lower surface in body 20.The third through-hole 202 is located in lower cover 20
The heart, its internal diameter is 1/8 inch.As shown in figure 8, the bottom surface of depressed part 201 is provided with the second circular groove 203, third through-hole 202
Connected with the second groove 203.
The middle part of core sample 30 is rock core 301, and the side wrap of rock core 301 has epoxy resin 302.Core sample 30 is embedding
Enter in the depressed part 201 and with the form fit of depressed part 201, the thickness of core sample 30 is identical with the depth of depressed part 201.
As shown in Figure 9 and Figure 10, in this embodiment, rock core 301 is discoid, and epoxy resin 302 is wrapped in the circumference of rock core 301
Sideways, so that core sample 30 is also to be discoid, a diameter of 2.5 inches of core sample 30, thickness be 0.25 inch.Upper cover body
10 lower surface is fastened on the upper surface of lower cover 20 and is bolted.Upper cover body 10 and lower cover 20 are provided with multiple
Even circumferential is distributed and the corresponding perforation 40 in position, and connecting bolt 50 is each passed through perforation 40 and connects upper cover body by nut 60
10 and lower cover 20.The upper surface of rock core 301 abuts the first groove 101；Between first groove 101 and the upper surface of rock core 301
Gap in formation, first through hole 102 is connected with the lower end of the second through hole 103 by gap on this, makes liquid in the upper of rock core 301
Surface forms flowing.The lower surface of rock core 301 abuts the second groove 203, between the second groove 203 and the lower surface of rock core 301
Form lower gap.Simulated formation fluid is passed into the lower gap for the downstream of simulation core 301 using third through-hole 202
Hydraulic pressure.
Further, as shown in Figure 4 and Figure 5, the position that the lower end of first through hole 102 is connected with the first groove 101 is provided with length and breadth
Communication groove 104 staggeredly, communication groove 104 is arranged on the top surface of the first groove 101, first through hole 102 and communication groove 104
Connection.The communication groove 104 is arranged in the certain area around the lower end of first through hole 102, and its effect is made from first through hole
The 102 simulated formation fluids being passed through form liquid in the upper surface of rock core 301, and simulated formation fluid passes through communication groove 104
It flow at the second through hole 103, is flowed out from the second through hole 103 in the upper surface diverging flow of rock core 301, and by upper gap.
In order that the better seal of core sample 30 is between upper cover body 10 and lower cover 20, epoxy resin 302 and upper lid
Between body 10, it is equipped with sealing ring between the bottom surface of epoxy resin 302 and depressed part 201 and is sealed.Specifically, upper cover body 10
Lower surface and the bottom surface of depressed part 201 be equipped with the o-ring groove 71 of a ring shape, o-ring groove 71 is built with O-shaped close
Seal 70, the epoxy resin 302 in sealing contact of O-ring seal 70 is sealed.
Core sample 30 is clamped in centre, upper cover body 10 by the three holes rock core kettle 100 by upper cover body 10 and lower cover 20
The upper setting through hole 103 of first through hole 102 and second, and the simulated formation fluid being passed through is made in rock core 301 by the first groove 101
Upper surface formed liquid.Simulated formation fluid is passed under rock core 301 by the third through-hole 202 set in lower cover 20
Be used for the hydraulic pressure in the downstream of simulation core 301 in lower gap at surface, can the original hole of objectively simulation core 301 ooze
Stream mode, it is simple in construction, it is easy to use.
Embodiment 2
Present invention also offers a kind of Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision using the three holes rock core kettle 100
1000, as shown in figure 11, the experimental provision 1000 include three hole rock core kettles 100, upstream simulated formation fluid intermediate receptacle 200,
Downstream simulation formation fluid intermediate receptacle 300 and testing liquid intermediate receptacle 400.
The first end of upstream simulated formation fluid intermediate receptacle 200, the first of downstream simulation formation fluid intermediate receptacle 300
End connects plunger pump 500, the first end and plunger pump 500 of simulated formation fluid intermediate receptacle 200 in upstream by pipeline respectively
Between pipeline be provided with control valve a1；Pipe between the first end and plunger pump 500 of downstream simulation formation fluid intermediate receptacle 300
Road is provided with control valve a2.
First through hole 102 connects the second end of upstream simulated formation fluid intermediate receptacle 200 by pipeline, in first through hole
102 are provided with control valve a3 with the connecting line at the end of upstream simulated formation fluid intermediate receptacle 200 second.Third through-hole 202 leads to
Cross the second end and the vavuum pump 600 of pipeline connection downstream simulation formation fluid intermediate receptacle 300；In the middle of downstream simulation formation fluid
Pipeline between second end of container 300 and third through-hole 202 is provided with control valve a4；Between vavuum pump 600 and third through-hole 202
Pipeline be provided with control valve a5.Second through hole 103 connects the first end of testing liquid intermediate receptacle 400, back-pressure valve by pipeline
700 first end and vavuum pump 600.Connect on pipeline between second through hole 103 and the first end of testing liquid intermediate receptacle 400
Meet control valve a6；Pipeline between second through hole 103 and the first end of back-pressure valve 700 is connected with control valve a7；Second through hole 103
Control valve a8 is connected on pipeline between vavuum pump 600.Second end of back-pressure valve 700 connects waste liquid cylinder 800 by pipeline.Return
3rd end of pressure valve 700, the second end of testing liquid intermediate receptacle 400 connect gas pressure regulating valve 900, gas pressure regulation by pipeline
The connection nitrogen cylinder of valve 900 N；Pipeline between 3rd end of back-pressure valve 700 and gas pressure regulating valve 900 is provided with control valve a9；Treat
The pipeline surveyed between the second end of liquid intermediate receptacle 400 and gas pressure regulating valve 900 is provided with control valve a10.Each control valve
The connection and closing of pipeline where for controlling.
Further, connect on the pipeline between the second end of downstream simulation formation fluid intermediate receptacle 300 and third through-hole 202
First pressure transmitter R1 is connected to, such as first pressure transmitter R1 is connected at third through-hole 202.The first of back-pressure valve 700
Second pressure transmitter R2 is connected with pipeline between end and the second through hole 103, such as second pressure transmitter R2 is connected to
At second through hole 103.The 3rd pressure inverting is connected with pipeline between 3rd end of back-pressure valve 700 and gas pressure regulating valve 900
Device R3, such as the 3rd pressure transmitter R3 are connected to the 3rd end of back-pressure valve 700.Each pressure transmitter connects for testing it
The pressure value taken in road.
Further, three hole rock core kettles 100, upstream simulated formation fluid intermediate receptacle 200, downstream are simulated in the middle of formation fluid
Container 300 and testing liquid intermediate receptacle 400 and the connecting pipeline between them are arranged in insulating box TM the (dotted line in Figure 11
Shown in frame), experiment is carried out under conditions of formation temperature.
Wherein, each intermediate receptacle is existing structure, and upstream simulated formation fluid intermediate receptacle 200 includes a steel cylinder
Rubber seal piston is provided with body, cylinder, the inside of cylinder is separated into first chamber and second chamber by piston, first chamber and
Second chamber can need to fill different liquid or gas with experimental.Piston can slide to change first in cylinder body
The size of chamber and second chamber.First chamber is located at first end, and by first end and pipeline connection, second chamber is located at second
End, passes through the second end and pipeline connection.The knot of downstream simulation formation fluid intermediate receptacle 300 and testing liquid intermediate receptacle 400
Structure is identical with the structure of upstream simulated formation fluid intermediate receptacle 200.That is, the of downstream simulation formation fluid intermediate receptacle 300
One chamber is located at first end, second chamber and is located at the second end；The first chamber of testing liquid intermediate receptacle 400 be located at first end,
Second chamber is located at the second end.
In experiment, in the middle of the first chamber of upstream simulated formation fluid intermediate receptacle 200 and downstream simulation formation fluid
Filled in the first chamber of container 300 be distilled water as central fluid, the driving of plunger pump 500 is transmitted by distilled water
Power.Second chamber of the second chamber of upstream simulated formation fluid intermediate receptacle 200 and downstream simulation formation fluid intermediate receptacle 300
What is filled in room is simulated formation fluid.What is filled in the first chamber of testing liquid intermediate receptacle 400 is testing liquid, second
Filled in chamber be nitrogen as central fluid, nitrogen cylinder N driving force is transmitted by nitrogen.The work of each intermediate receptacle
It is that driving source (plunger pump 500 or nitrogen cylinder N) drives piston to move by central fluid (distilled water or nitrogen) as principle, by work
Fill in being pushed into by driving liquid (simulated formation fluid or testing liquid) in the pipeline being connected for opposite side.
The experimental provision is easy to connect using simple, with reference to three hole rock core kettles 100 using can obtain reliably testing number
According to.
Embodiment 3
China somewhere has abundant shale gas resource, and shale reservoir matrix is fine and close, belongs to typical Oil in Super-low Permeability Reservoirs, page
The exploitation of rock gas resource is, it is necessary to which extensive hydraulic fracturing job is transformed reservoir, in order to form the volume seam net of complexity, plan
Using slippery water fracturing fluid system.For extent of injury of the mini-frac liquid to this area's shale reservoir, present invention also offers one
The experimental method using above-mentioned experimental provision 1000 is planted, the experimental method includes：
S1, prepares a diameter of 2.5 inches, thickness is 0.25 inch of core sample 30, and prepares and original void fluid
Activity identical simulated formation fluid.
S2, loads three hole rock core kettles 100 by the core sample 30 prepared, all parts is connected by pipeline.Will
Pipeline connection between vavuum pump 600 and third through-hole 202, the second through hole 103, remaining connecting line is turned off；Start true
Empty pump 600 is vacuumized, and the time vacuumized is at least 20 minutes.
S3, pipeline plunger pump 500, downstream simulated between formation fluid intermediate receptacle 300 and third through-hole 202 connects
Logical, remaining connecting line is turned off；Plunger pump 500 injects working solution with the 0.2MPa of setting pressure to third through-hole 202,
Pressure stability postscript is downstream initial pressure P0；P0Should be identical with rock sample original pore pressure, record injection rock core 301 downstream
Liquid volume is V=38.5cm3。
S4, by plunger pump 500, upstream simulated formation fluid intermediate receptacle 200, the through hole 103 of first through hole 102 and second,
Pipeline connection between back-pressure valve 700, gas pressure regulating valve 900, nitrogen cylinder N, remaining connecting line is turned off；Make simulated formation
Fluid is in the upper surface constant flow of rock core 301, the pressure (or being rock sample downstream pressure) of the lower surface of continuous monitoring rock core 301,
Until the pressure of the lower surface of rock core 301 is equal to the pressure (or being rock sample upstream pressure) of the upper surface of rock core 301, such as Figure 12 institutes
Show；The first liquid, which is calculated, using the relation between each pressure surveys permeability k1, calculate obtained k1=6.48 × 10-9um2, with text
The shale permeability range 10 that chapter SPE-27496 is disclosed-6-10-12um2Match.
S5, by the pipeline between the second through hole 103, testing liquid intermediate receptacle 400, gas pressure regulating valve 900 and nitrogen cylinder N
Connection, remaining connecting line is turned off；Adjust gas pressure regulating valve 900 sets pressure as 4.5MPa, will treat at this pressure
The testing liquid surveyed in liquid intermediate receptacle 400 is pushed into the upper surface of rock core 301 and continues 5 hours, makes rock core 301 to be measured
Liquid pollutes.
S6, the liquid of duplicate measurements first surveys permeability k1When step S3 to step S4, measure rock core 301 dirty by testing liquid
The second liquid after dye surveys permeability k2；Obtained each pressure value is remeasured according to repeat step S3 and step S4 and calculates what is obtained
k2=2.96 × 10-9um2.Permeability k is surveyed in the liquid of measurement second2The step of in the pressure of the lower surface of rock core 301 be gradually increasing directly
To the pressure equal to the upper surface of rock core 301, as shown in figure 13；Pass through k1And k2Value calculate infringement of the testing liquid to rock core 301
Rate λd。
Wherein, the connection and closing of respective line are controlled by opening and closing control valve.
Further, the method for preparing core sample 30 comprises the following steps：
The first step, is wrapped up in well head coring 301 and at once by rock core 301 with thick Polythene Bag, is put into sealing bucket
Preserve；The time of contact of rock core 301 and air is reduced as far as possible, to protect the water activity of the original pore-fluid inside rock core 301.
Second step, in laboratory, rock core 301 is put into paraffin oil, then drilled through with the paraffin oil of rig and low toxicity
A diameter of 2 inches, the core column that length is 4 inches.
3rd step, 1 is pressed by epoxide-resin glue and curing agent：1 ratio is sufficiently mixed, be subsequently poured into external diameter for 2.5 inches, it is interior
In the heat resistant plastice pipe (polycarbonate or acrylic compounds) that footpath is 2.125 inches, length is 8 inches.
4th step, core column is put into heat resistant plastice pipe, and core column is placed in heat resistant plastice tube hub, stands 24 small
When.
5th step, core column and heat resistant plastice pipe are placed in baking oven, are heated 1 hour under the conditions of 110 DEG C；Detect rock core
Post with whether epoxy resin cementing is integrated.
6th step, it is cementing be integrated after, the core column for wrapping up epoxide-resin glue is cut to the paraffin oil of annular saw and low toxicity
Core sample 30 is made in the thin slice of 0.25 inch, and core sample 30 is placed in paraffin oil and preserved.
Further, in step sl, it is 0.85 to test original pore-fluid water activity, and is prepared and the work of original pore-fluid
Identical simulation reservoir fluid KCl solution is spent, (20 DEG C) measure KCl solution viscosities μ for 1mPas at room temperature, static pressure
Shrinkage β is 4.5 × 10-4MPa-1。
Further, the experimental method is also included upstream simulated formation fluid intermediate receptacle 200 and downstream simulated formation stream
Filled in the first chamber of body intermediate receptacle 300 for transmit the driving force of plunger pump 500 distilled water, fill mould in second chamber
Intend formation fluid；Filled being filled in the first chamber of testing liquid intermediate receptacle 400 in testing liquid, second chamber for passing
Pass the nitrogen of nitrogen cylinder N driving forces.
Further, downstream initial pressure P is measured by first pressure transmitter R1 in step S30；Rock core 301 in step S4
The pressure (or being rock sample upstream pressure) of upper surface is flowing pressure Pm, back-pressure valve 700 pressure be back pressure Pb, under rock core 301
The pressure (or being rock sample downstream pressure) on surface is P (l, t), PmMore than Pb；Specifically, P0=0.2MPa, Pm=2MPa, Pb=
1.5MPa；PmMeasured by second pressure transmitter R2, PbMeasured by the 3rd pressure transmitter R3；P (l, t) is being carried out over time
Change, is monitored by first pressure transmitter R1；Calculate the first liquid and survey permeability k1Formula be：
Wherein：The viscosity of μ-fluid, mPas；
β-hydrostatic compression ratio, MPa-1；
V- rock cores lower end enclosed fluid volume (assuming that upper end fluid volume is infinitely great), cm3；
L- rock core length, cm；
The cross-sectional area of A- rock cores, cm2；
Δ t- time differences, s；
P (l, t)-rock sample lower end t pressure, MPa.
Further, the second liquid is calculated in step S6 and surveys permeability k2Formula survey permeability k with calculating the first liquid1Formula
It is identical, variable P therein0、Pm, P (l, t) corresponding be value measured after rock core 301 is polluted by testing liquid.Calculate rock core
301 loss ratio λdFormula be：
I.e.
The experimental method passes through fluid by making the upper and lower surface of core sample 30 contact the simulated formation fluid of identical activity
Dialysis pressure transmission is eliminated in the upper surface constant flow of rock core 301, so as to only exist hydraulic pressure between the upstream and downstream of core sample 30
Transmit, and then monitor downstream liquid pressure and change with time, try to achieve core sample 30 and pollute front and rear permeability, and by oozing
Extent of injury of the testing liquid to core sample 30 is evaluated in the change of saturating rate.The experimental method significantly reduces test pressure,
And dialysis pressure is eliminated, experimental data is reliable, therefore is particularly suitable for use in Oil in Super-low Permeability Reservoirs liquid damage evaluation, is such reservoir work
Make liquid and foundation is preferably provided.
Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, made equivalent variations and modification on the premise of the design of the present invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (18)
1. a kind of three holes rock core kettle, it is characterised in that the three holes rock core kettle includes：
Upper cover body, the lower surface of the upper cover body be provided with the first groove, the upper cover body provided with its upper surface of insertion with it is described
The first through hole of first groove and the second through hole；
Lower cover, the upper surface of the lower cover be provided with depressed part, the lower cover provided with its lower surface of insertion with it is described recessed
The third through-hole in the portion of falling into；The bottom surface of the depressed part is provided with the second groove, and the third through-hole is connected with second groove；
Core sample, the middle part of the core sample is rock core, and the side wrap of the rock core has epoxy resin；The rock core examination
Sample be embedded in the depressed part and with the form fit of the depressed part, the thickness of the core sample and the depressed part
Depth is identical；
The lower surface of the upper cover body is fastened on the upper surface of the lower cover and is bolted；The upper table of the rock core
Face abuts first groove；Upper gap is formed between the upper surface of first groove and the rock core；Under the rock core
Lower gap is formed between second groove described in surface contiguous, the lower surface of second groove and the rock core.
2. three holes rock core kettle as claimed in claim 1, it is characterised in that the rock core is discoid, the epoxy resin bag
It is rolled in the circumference side of the rock core；First groove, second groove and the depressed part are circle.
3. three holes rock core kettle as claimed in claim 1, it is characterised in that the first through hole lower end connects with first groove
Logical position is provided with crisscross communication groove, and the communication groove is arranged on the top surface of first groove, described first
Through hole is connected with the communication groove.
4. three holes rock core kettle as claimed in claim 1, it is characterised in that between the epoxy resin and the upper cover body, institute
Sealing ring is equipped between the bottom surface for stating epoxy resin and the depressed part to be sealed.
5. three holes rock core kettle as claimed in claim 1 or 2, it is characterised in that the upper cover body and the lower cover are not
The cylindrical that rust Steel material is made, the third through-hole is located at the center of the lower cover；
The upper cover body and the lower cover are distributed and the corresponding perforation in position provided with multiple even circumferentials, connecting bolt difference
Through the perforation and the upper cover body and the lower cover are connected by nut.
6. a kind of Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision, it is characterised in that the experimental provision includes right such as will
Three hole rock core kettles described in 1 to 5 any one are sought, the experimental provision also includes upstream simulated formation fluid intermediate receptacle, downstream
Simulated formation fluid intermediate receptacle and testing liquid intermediate receptacle；
The first end of the upstream simulated formation fluid intermediate receptacle, the downstream simulate the first end of formation fluid intermediate receptacle
Plunger pump is connected by pipeline respectively；The first through hole connects the upstream simulated formation fluid intermediate receptacle by pipeline
Second end；The third through-hole connects the second end and vavuum pump that formation fluid intermediate receptacle is simulated in the downstream by pipeline；
Second through hole connects the first end, the first end of back-pressure valve and vavuum pump of the testing liquid intermediate receptacle by pipeline；
Second end of the back-pressure valve connects waste liquid cylinder by pipeline；3rd end of the back-pressure valve, the testing liquid intermediate receptacle
The second end pass through pipeline and connect gas pressure regulating valve, the gas pressure regulating valve connects nitrogen cylinder.
7. Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision as claimed in claim 6, it is characterised in that the third through-hole
Place is connected with first pressure transmitter；Second through hole is connected with second pressure transmitter；3rd end of the back-pressure valve
It is connected with the 3rd pressure transmitter.
8. Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision as claimed in claim 6, it is characterised in that three hole rock core
In kettle, the upstream simulated formation fluid intermediate receptacle, downstream simulation formation fluid intermediate receptacle and the testing liquid
Between container be arranged in insulating box.
9. the Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision as described in claim 6 or 7 or 8, it is characterised in that on described
Swimming simulated formation fluid intermediate receptacle includes being provided with piston in a cylinder, the cylinder, and the piston is by the inside of the cylinder
First chamber and second chamber are separated into, the first chamber is located at first end, and the second chamber is located at the second end；
The structure of the downstream simulation formation fluid intermediate receptacle and the testing liquid intermediate receptacle simulates ground with the upstream
The structure of layer fluid intermediate receptacle is identical.
10. the Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision as described in claim 6 or 7 or 8, it is characterised in that each
The pipeline is provided with the control valve for controlling the respective line break-make.
11. a kind of reality using the Oil in Super-low Permeability Reservoirs liquid damage evaluation experimental provision as any one of claim 6 to 10
Proved recipe method, it is characterised in that the experimental method includes：
S1, prepares the core sample, and prepare and original void fluid activity identical simulated formation fluid；
S2, loads the three holes rock core kettle, by the vavuum pump and the third through-hole, institute by the core sample prepared
The pipeline connection between the second through hole is stated, remaining connecting line is turned off；Start the vavuum pump to vacuumize；
S3, the pipeline connection between formation fluid intermediate receptacle and the third through-hole is simulated by the plunger pump, the downstream,
Remaining connecting line is turned off；The plunger pump is injected after working solution, pressure stability with setting pressure to the third through-hole
It is designated as downstream initial pressure P0；P0Should be identical with rock sample original pore pressure；
S4, by the plunger pump, the upstream simulated formation fluid intermediate receptacle, the first through hole and second through hole,
Pipeline connection between the back-pressure valve, the gas pressure regulating valve, the nitrogen cylinder, remaining connecting line is turned off；Make institute
Simulated formation fluid is stated in rock core upper surface constant flow, the pressure of rock core lower surface described in continuous monitoring, until described
The pressure of rock core lower surface is equal to the pressure of the rock core upper surface；Calculate the first liquid using the relation between each pressure and survey and ooze
Saturating rate k1；
S5, by the pipe between second through hole, the testing liquid intermediate receptacle, the gas pressure regulating valve and the nitrogen cylinder
Road is connected, and remaining connecting line is turned off；Adjust the gas pressure regulating valve sets pressure as 4.5MPa, at this pressure will
Testing liquid in the testing liquid intermediate receptacle is pushed into the upper surface of the rock core and continues 5 hours；
S6, the liquid of duplicate measurements first surveys permeability k1Step S3 to step S4, measure the rock core and polluted by the testing liquid
The second liquid afterwards surveys permeability k2；Permeability k is surveyed by the first liquid1Permeability k is surveyed with the second liquid2Value calculate the prepare liquid
Loss ratio λ of the body to the rock cored。
12. experimental method as claimed in claim 11, it is characterised in that the core sample is prepared in step S1 including following
Step：
The first step, exists side by side in well head coring and quarter wraps up rock core with Polythene Bag, is put into sealing bucket and preserves；
Second step, the rock core is put into paraffin oil, then drilled through with rig and paraffin oil a diameter of 2 inches, length be 4 English
Very little core column；
3rd step, 1 is pressed by epoxide-resin glue and curing agent：1 ratio is sufficiently mixed, be subsequently poured into external diameter be 2.5 inches, internal diameter be
2.125 inches, length is in 8 inches of heat resistant plastice pipe；
4th step, the core column is put into the heat resistant plastice pipe, and the core column is placed in the heat resistant plastice pipe
Center, stands 24 hours；
5th step, the core column and the heat resistant plastice pipe are placed in baking oven, are heated 1 hour under the conditions of 110 DEG C；
6th step, the thin slice that the core column for wrapping up epoxide-resin glue is cut to 0.25 inch is made with annular saw and paraffin oil
The core sample, the core sample is placed in paraffin oil and preserved.
13. experimental method as claimed in claim 11, it is characterised in that in step sl, tests original pore-fluid water and lives
Spend for 0.85, and prepare and simulate reservoir fluid KCl solution with archioporus clearance flow volume activity identical.
14. experimental method as claimed in claim 11, it is characterised in that by the upstream simulated formation fluid intermediate receptacle and
Filled in the first chamber of downstream simulation formation fluid intermediate receptacle for transmit the plunger pump driving force distilled water,
The simulated formation fluid is filled in second chamber；
It will fill and filled in the testing liquid, second chamber for transmitting in the first chamber of the testing liquid intermediate receptacle
The nitrogen of the nitrogen cylinder driving force.
15. experimental method as claimed in claim 11, it is characterised in that controlled by control valve the connection of respective line with
Close.
16. experimental method as claimed in claim 11, it is characterised in that surveyed in step S3 by the first pressure transmitter
Measure the downstream initial pressure P0；The pressure of rock core upper surface described in step S4 is flowing pressure Pm, the back-pressure valve pressure
For back pressure Pb, the rock core lower surface pressure be P (l, t), PmMore than Pb；PmMeasured by the second pressure transmitter, PbBy
3rd pressure transmitter measurement；P (l, t) is measured by the first pressure transmitter；Calculate first liquid and survey permeability
k1Formula be：
<mrow>
<mi>k</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&mu;</mi>
<mi>&beta;</mi>
<mi>V</mi>
<mi>l</mi>
</mrow>
<mi>A</mi>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mrow>
<mi>&Delta;</mi>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<msub>
<mi>P</mi>
<mi>m</mi>
</msub>
<mo>-</mo>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
</mrow>
<mrow>
<msub>
<mi>P</mi>
<mi>m</mi>
</msub>
<mo>-</mo>
<mi>P</mi>
<mrow>
<mo>(</mo>
<mi>l</mi>
<mo>,</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
</mrow>
</mfrac>
</mrow>
Wherein：The viscosity of μ-fluid, mPas；
β-hydrostatic compression ratio, MPa-1；
V- rock cores lower end enclosed fluid volume (assuming that upper end fluid volume is infinitely great), cm3；
L- rock core length, cm；
The cross-sectional area of A- rock cores, cm2；
Δ t- time differences, s；
P (l, t)-rock sample lower end t pressure, MPa.
17. experimental method as claimed in claim 16, it is characterised in that second liquid is calculated in step S6 and surveys permeability k2
Formula and step S4 in calculate first liquid and survey permeability k1Formula it is identical, variable P therein0、Pm, P (l, t) correspondence
Be value measured after the rock core is polluted by testing liquid.
18. the experimental method as any one of claim 11 to 17, it is characterised in that calculate the loss ratio of the rock core
λdFormula be：
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| CN106501155A (en) * | 2016-11-23 | 2017-03-15 | 中国地质大学（武汉） | Rock core gas liquid two purpose permeability test device and reservoir damage evaluation method |
| CN107132367A (en) * | 2017-06-29 | 2017-09-05 | 上海永毓科学仪器有限公司 | A kind of Full-automatic fiber analyzer |
| CN107907464B (en) * | 2017-11-09 | 2020-01-24 | 西南石油大学 | Device and method for measuring performance of permeable stone cement slurry for fracturing |
| CN110346386A (en) * | 2019-06-27 | 2019-10-18 | 中国石油大学(华东) | A kind of reservoir damage test device being convenient to clean |
| CN111024561A (en) * | 2019-12-12 | 2020-04-17 | 中国石油化工股份有限公司 | Experimental device and method for evaluating damage of solid particles in reinjection water to reservoir |
| CN114062215B (en) * | 2020-08-03 | 2023-10-31 | 中国石油天然气股份有限公司 | Core high-pressure measurement permeability experimental device and evaluation method |
| CN112903566B (en) * | 2021-03-02 | 2023-05-12 | 东北石油大学 | Full-diameter rock core radial permeability testing tool |
| CN114894693B (en) * | 2022-04-28 | 2023-03-28 | 河南理工大学 | Small-size rock core permeability testing method and device |
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| CN201242522Y (en) * | 2008-07-31 | 2009-05-20 | 中国石油天然气股份有限公司 | Measuring device suitable for hypotonic extra-hypotonic rock core porosity |
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| CN201242522Y (en) * | 2008-07-31 | 2009-05-20 | 中国石油天然气股份有限公司 | Measuring device suitable for hypotonic extra-hypotonic rock core porosity |
| CN103556993A (en) * | 2013-11-07 | 2014-02-05 | 中国石油大学(北京) | Simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding |
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