CN108240951A - compact sandstone gas reservoir sensitivity evaluation test method - Google Patents
compact sandstone gas reservoir sensitivity evaluation test method Download PDFInfo
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- CN108240951A CN108240951A CN201611208650.0A CN201611208650A CN108240951A CN 108240951 A CN108240951 A CN 108240951A CN 201611208650 A CN201611208650 A CN 201611208650A CN 108240951 A CN108240951 A CN 108240951A
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- 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The present invention provides a kind of compact sandstone gas reservoir sensitivity experimental evaluation method.Compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention, including：First vacuumize process is carried out, and carry out the first saturated process to core sample with simulated formation water to core sample；First centrifugal treating is carried out to the core sample after the first saturated process, until the water saturation of core sample reaches the original water saturation of reservoir；The gas velocity measurement of the core sample after the first centrifugal treating is tested under default displacement pressure；Second vacuumize process is carried out, and carry out the second saturated process to core sample with fluid to be evaluated to core sample；Second centrifugal treating is carried out to the core sample after the second saturated process, until the water saturation of core sample reaches the original water saturation of reservoir；The gas velocity measurement of the core sample after the second centrifugal treating is tested under default displacement pressure, obtains the extent of damage of the fluid to be evaluated to core sample.The present invention being capable of accurate evaluation rock core damage.
Description
Technical field
The present invention relates to petroleum natural gas exploration technology more particularly to a kind of compact sandstone gas reservoir sensitivity evaluations
Test method.
Background technology
With the increasingly increase to decline to a great extent with Demand of Oil ＆ Gas of conventional gas and oil resource yield, it is badly in need of realizing extensive exploration
The higher unconventional petroleum resources of development reserves.Wherein, as in unconventional petroleum resources, " conventional gas and oil provides compact sandstone gas
Source ", have the characteristics that reservoir is fine and close, receive-micropore larynx, low initial water saturation, sensitive minerals enrichment, fracture development.When
The exploration and development technology of preceding compact sandstone gas usually uses for reference the exploration and development technology of conventional gas and oil.But compact sandstone gas drilling well,
Each cargo handling operation of the exploitation overall process such as completion, test, well workover, volume increase, exploitation, which can show, easily occurs sensibility damage.
It is generally commented for compact sandstone gas reservoir sensitivity damage appraisement using the reservoir sensitivity in existing professional standard
Valency method, it is anti-with core sample under reservoir conditions using acid, alkali and different salinity fluids by using rock core flowing experiment
It should or change fluid flow rate and effective stress, permeability before and after testing rock core sample experiments evaluates reservoir sensitivity feature.
However, for compact sandstone gas reservoir sensitivity damage appraisement, the reservoir sensitivity evaluation in existing professional standard
There are unreasonable parts for method.1) compact sandstone gas is using liquid phase as displacing medium, it may appear that liquid phase seepage flow is difficult or can not ooze
Stream, and liquid phase evaluation does not meet compact sandstone gas Reservoir Seepage rule；2) the aqueous gas phase with not aqueous compact rock core sample
Permeability difference is very big.Usual tight sand gas reservoir typically contains certain pore water, directly using anhydrous core sample
The result that permeability is evaluated can not effectively represent compact sandstone gas Reservoir Seepage feature；3) conventional gas drive water establishes beam
During tiing up water saturation, the volatilization of core sample inner pore water is susceptible to, causing to saltout blocks hole so that sensibility is damaged
Evil evaluation result is bigger than normal.
Invention content
The present invention provides a kind of compact sandstone gas reservoir sensitivity evaluation test method, to solve to store up in existing professional standard
Layer sensitivity evaluation method does not meet gas reservoir percolation law using the damage of liquid testing sensibility, and liquid is in compact reservoir seepage flow
The problem of difficulty, easy salting-out crystallization blocks pore throat in evaluation procedure.
The present invention provides a kind of compact sandstone gas reservoir sensitivity evaluation test method, including：
Core sample is prepared, the first vacuumize process is carried out, and with simulated formation water to the rock to the core sample
Heart sample carries out the first saturated process, obtains the core sample after the first saturated process；
First centrifugal treating is carried out to the core sample after first saturated process, until the core sample is aqueous
Saturation degree Sw1Reach the original water saturation of reservoir；
The gas velocity measurement V of the core sample after the first centrifugal treating is tested under default displacement pressure1；
Second vacuumize process is carried out, and carry out second to the core sample with fluid to be evaluated to the core sample
Saturated process obtains the core sample after the second saturated process；
Second centrifugal treating is carried out to the core sample after second saturated process, until the core sample is aqueous
Saturation degree Sw2Reach the original water saturation of reservoir；
The gas velocity measurement V of the core sample after the second centrifugal treating is tested under the default displacement pressure2；
According to the gas velocity measurement V1With the gas velocity measurement V2, the fluid to be evaluated is obtained to the core sample
The extent of damage.
Optionally, it is described according to the gas velocity measurement V1With the gas velocity measurement V2, the fluid to be evaluated is obtained to described
The extent of damage of core sample, including：
The extent of damage of the fluid to be evaluated to the core sample is obtained by equation below one；
Wherein, V1The corresponding gas velocity measurement of representative simulation water flooding, unit are μ L/s；
V2The corresponding gas velocity measurement of fluid to be evaluated is represented, unit is μ L/s；
RdValue it is directly proportional to the extent of damage.
Optionally, the first vacuumize process is carried out to the core sample, and with simulated formation water to the core sample
The first saturated process is carried out, obtains the core sample after the first saturated process, including：
The core sample is placed in vacuum chamber, the first preset duration of vacuumize process, first preset duration is more than
12 hours；
Simulated formation water is injected into the vacuum chamber, when core sample second is preset described in saturation under preset pressure
Long, second preset duration is more than 24 hours, and the preset pressure is more than 25MPa；
Accordingly, the second vacuumize process is carried out to the core sample, and with fluid to be evaluated to the core sample
The second saturated process is carried out, obtains the core sample after the second saturated process, including：
The core sample is placed in vacuum chamber, the first preset duration described in vacuumize process；
Fluid to be evaluated is injected into the vacuum chamber, core sample second described in saturation is default under the preset pressure
Duration.
Optionally, the first centrifugal treating is carried out to the core sample after first saturated process, until the core sample
The water saturation S of productw1Reach the original water saturation of reservoir, including：
First centrifugal treating is carried out to the core sample after first saturated process using supercentrifuge, until centrifugation
The water saturation S of the core sample afterwardsw1Reach the original water saturation of reservoir, and pore water is evenly distributed；
Accordingly, the second centrifugal treating is carried out to the core sample after second saturated process, until the core sample
The water saturation S of productw2Reach the original water saturation of reservoir, including：
Second centrifugal treating is carried out to the core sample after second saturated process using supercentrifuge, until centrifugation
The water saturation S of the core sample afterwardsw2Reach the original water saturation of reservoir, and pore water is evenly distributed；
Wherein, during the first centrifugal treating and the second centrifugal treating, centrifugal rotational speed is constant speed 10000r/min, and every
10min exchanges rock core direction and centrifuges again.
Optionally, the gas velocity measurement V of the core sample after the first centrifugal treating is tested under presetting displacement pressure1,
Including：
Using soap-film microfluidic instrument, the core sample after the first centrifugal treating is tested under the conditions of displacement pressure is 2MPa
Gas velocity measurement V1；
Accordingly, the gas velocity measurement V of the core sample after the second centrifugal treating is tested under the default displacement pressure2,
Including：
Using soap-film microfluidic instrument, the core sample after the second centrifugal treating is tested under the conditions of displacement pressure is 2MPa
Gas velocity measurement V2。
Optionally, the core sample for obtaining drying includes：
Piston-shaped core sample is drilled through, the length of the core sample is more than 4 centimetres；
Washing oil and desalinization of soil by flooding or leaching processing are carried out to the core sample；
Drying and processing is carried out to the core sample, obtains the core sample of drying.
Optionally, the first saturated process is being carried out to the core sample with simulated formation water, is obtaining the first saturated process
After core sample afterwards, further include：
First nuclear magnetic resonance test is carried out to the core sample after first saturated process, obtains the first nuclear magnetic resonance T2
Spectrum；
Accordingly, second saturated process is being carried out to the core sample with fluid to be evaluated, is obtaining the second saturated process
After core sample afterwards, further include：
Second nuclear magnetic resonance test is carried out to the core sample after second saturated process, obtains the second nuclear magnetic resonance T2
Spectrum；
According to first nuclear magnetic resonance T 2 spectrum and second nuclear magnetic resonance T 2 spectrum, pore structure sensibility damage is obtained
Evil.
Compact sandstone gas reservoir sensitivity evaluation test method of the present invention, by preparing core sample, to core sample into
The first vacuumize process of row, and the first saturated process is carried out to core sample with simulated formation water, after obtaining the first saturated process
Core sample, to after the first saturated process core sample carry out the first centrifugal treating, until core sample contain water saturation
Spend Sw1Reach the original water saturation of reservoir.The gas for the core sample tested under default displacement pressure after the first centrifugal treating is surveyed
Flow velocity V1.Second vacuumize process is carried out, and carry out the second saturated process to core sample with fluid to be evaluated to core sample,
Obtain the core sample after the second saturated process.Second centrifugal treating is carried out to the core sample after the second saturated process, until
The water saturation S of core samplew2Reach the original water saturation of reservoir.The second centrifugal treating is tested under default displacement pressure
The gas velocity measurement V of core sample afterwards2.According to gas velocity measurement V1Gentle velocity measurement V2, fluid to be evaluated is obtained to core sample
The extent of damage.The present invention does not use only gas as tested media, meets gas reservoir percolation law, solves existing industry technology
In standard compact rock core liquid phase seepage flow it is difficult or can not seepage flow the problem of.Original water saturation is established using centrifugal process, is avoided
The problem of easy liquid phase volatilization of conventional gas drive, salting-out crystallization, and overcome single gas phase displacement test that cannot represent original place reservoir
Feature.Gas flow rate in rock core, passes through tight sand gas reservoir sensitivity before and after soap-film microfluidic instrument detection sensitivity experiment simultaneously
Property the front and rear flow velocity evaluation tight sand gas reservoir of experiment in the gas permeability extent of damage and pore structure characteristic of damage so that
Rock core damage evaluation result is more accurate.
Description of the drawings
Fig. 1 is the flow chart of compact sandstone gas reservoir sensitivity evaluation test method embodiment one of the present invention；
Fig. 2 is the structure of evacuation-high pressure saturation device of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention
Schematic diagram；
Fig. 3 is the structural representation of the soap-film microfluidic instrument of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention
Figure；
Fig. 4 is the flow chart of compact sandstone gas reservoir sensitivity evaluation test method embodiment two of the present invention；
Fig. 5 be compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention the quick experimental evaluation of salt after flow ratio and
Curve graph between the water flooding of different salinities；
Fig. 6 is T2 spectrograms one after the quick experimental evaluation of salt of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention；
Fig. 7 is T2 spectrograms two after the quick experimental evaluation of salt of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention.
Specific embodiment
Fig. 1 is the flow chart of compact sandstone gas reservoir sensitivity evaluation test method embodiment one of the present invention, such as Fig. 1 institutes
Show, the compact sandstone gas reservoir sensitivity evaluation test method of the present embodiment includes：
Step 101 prepares core sample, and the first vacuumize process is carried out, and with simulated formation water to rock to core sample
Heart sample carries out the first saturated process, obtains the core sample after the first saturated process.
Specifically, the present embodiment is more than 4 centimetres, then to rock by drilling through piston-shaped core sample, the length of core sample
Heart sample carries out washing oil and desalinization of soil by flooding or leaching processing, carries out drying and processing to core sample, finally obtains the core sample of drying.
After the core sample prepared, core sample is positioned in evacuation-high pressure saturation device, is taken out
The processing of empty, high pressure and saturation.With reference to Fig. 2, to obtaining the specific implementation process of the core sample after the first saturated process
It is described in detail.
Fig. 2 is the knot of evacuation-high pressure saturation device of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention
Structure schematic diagram, as shown in Fig. 2, being handled in the present embodiment using evacuation-high pressure saturation device the core sample of preparation
Detailed process includes：
Core sample is positioned in vacuum chamber 16 first, closes valve 13 and 15, opens valve 17 so that vacuum pump 19
It is connected with vacuum chamber 16.Then, vacuum pump 19 starts operation, and pressurizes to the core sample in vacuum chamber 16, can be by true
Sky pump 19 detects the size of its pressure with the pressure vacuum gauge 18 being equipped on 16 communication line of vacuum chamber, and then controls vacuum pump 19
Pressure.Under normal circumstances, the first preset duration of vacuumize process is carried out to core sample, wherein the first preset duration is greater than 12
Hour.
Secondly, valve 15 is opened, injects simulated formation into vacuum chamber 16 equipped with simulated formation water in intermediate receptacle 14
Water after the simulated formation water in intermediate receptacle 14 has all flowed to vacuum chamber 16, fully impregnates and obtains saturated core sample.
Again, valve 15 and valve 17 are closed, valve 13 is opened, is connected by elevated pressurization device 11 with vacuum chamber 16.
Then, elevated pressurization device 11 pressurizes to the saturated core sample in vacuum chamber 16, can pass through elevated pressurization device 11 and vacuum
The high-pressure manometer detector pressure size being equipped on 16 communication line of room, and then control the pressure of elevated pressurization device 11.Generally
In the case of, the second preset duration of pressurizeing under preset pressure to saturated core sample, wherein to be greater than 24 small for the second preset duration
When, preset pressure is more than 25MPa.
Finally, the core sample after the first saturated process is taken out from vacuum chamber 16.
Step 102 carries out the first centrifugal treating to the core sample after the first saturated process, until core sample is aqueous
Saturation degree Sw1Reach the original water saturation of reservoir.
Specifically, the first centrifugation carries out the core sample after the first saturated process using supercentrifuge in the present embodiment
Processing, the water saturation S of core sample after centrifugationw1Reach the original water saturation of reservoir, and pore water is evenly distributed.
Original water saturation is established using centrifugal process, ensures that rock core inner pore water will not volatilize and generates salting-out crystallization.Wherein,
During one centrifugal treating, centrifugal rotational speed is constant speed 10000r/min, and rock core direction is exchanged per 10min and centrifuges to ensure hole again
Water distribution is uniform.
Step 103, the gas velocity measurement V that the core sample after the first centrifugal treating is tested under default displacement pressure1。
Specifically, the present embodiment uses soap-film microfluidic instrument testing rock core gas flow rate, is 2MPa in default displacement pressure
Under the conditions of, the gas velocity measurement V of the core sample after the first centrifugal treating can be tested1.With reference to Fig. 3, to obtain first from
The specific implementation process of the heart treated core sample is described in detail.
Fig. 3 is the structural representation of the soap-film microfluidic instrument of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention
Figure, as shown in figure 3, to the core sample after the first centrifugal treating into promoting the circulation of qi velocity measurement V in the present embodiment1The detailed process of detection
Including：
First the core sample after first saturation centrifugal treating is fixed with core holding unit 23, valve 24 is opened, using enclosing
After press pump 25 carries out the core sample after the first centrifugal treating pressurized treatments, while use nitrogen cylinder 21 is to the first centrifugal treating
Core sample carry out air blowing processing.Wherein, the company that the core sample after confining pressure pumps 25 pair of first centrifugal treating pressurizes
On logical line, the pressure that it applies can be detected equipped with pressure gauge 25.The output terminal of core holding unit 23 then connects liquid film figure
As acquisition 26, the gas velocity measurement V of the core sample after the first centrifugal treating is shown1, then acquired by computer 27 and preserve gas flow measurement
Fast V1Data.
Further, tight sand gas reservoir is generally aqueous, is not only conformed with using gas displacement core sample gas test
The percolation law of tight sand gas reservoir is also overcomed in existing professional standard using liquid testing seepage flow is difficult or not seepage flow
Problem.But single gas phase displacement test cannot represent original place reservoir characteristic, therefore, be with simulated formation water saturation core sample,
Eliminate the influence of prime stratum.
Step 104 carries out the second vacuumize process, and carry out second to core sample with fluid to be evaluated to core sample
Saturated process obtains the core sample after the second saturated process.
Specifically, the core sample for carrying out the second vacuumize process is the core sample after the first saturation centrifugal treating
Product.As shown in Fig. 2, step 101 is can refer to, using evacuation-high pressure saturation device to the rock after the first saturation centrifugal treating
The detailed process that heart sample is handled is identical with the detailed process that the core sample to preparation is handled, no longer superfluous herein
It states.But it needs to change the fluid in intermediate receptacle 14, wherein, it is simulated formation water that the first saturated process, which uses, the second saturation
It is fluid to be evaluated that processing, which uses, and the liquid different from simulated formation water salinity, and salinity can be used in fluid to be evaluated
Water flooding between 0-1 all may be used.
Step 105 carries out the second centrifugal treating to the core sample after the second saturated process, until core sample is aqueous
Saturation degree Sw2Reach the original water saturation of reservoir.
Specifically, the second centrifugation carries out the core sample after the second saturated process using supercentrifuge in the present embodiment
Processing, the water saturation S of core sample after centrifugationw2Reach the original water saturation of reservoir, and pore water is evenly distributed.
Wherein, during the second centrifugal treating, centrifugal rotational speed is constant speed 10000r/min, and rock core direction is exchanged per 10min and is centrifuged again
To ensure that pore water is evenly distributed.The second centrifugal treating is identical with the centrifugal condition that the first centrifugal treating uses in the present embodiment,
And centrifugal process is also identical.
Step 106, the gas velocity measurement V that the core sample after the second centrifugal treating is tested under default displacement pressure2。
Specifically, the present embodiment uses soap-film microfluidic instrument, default displacement pressure for test under the conditions of 2MPa second from
The gas velocity measurement V of the heart treated core sample2。
Wherein, to the core sample after the second centrifugal treating and to the core sample after the first centrifugal treating in the present embodiment
Into promoting the circulation of qi velocity measurement V1The process of detection is identical, as shown in figure 3, can refer to step 103, details are not described herein again.
Step 107, according to gas velocity measurement V1Gentle velocity measurement V2, obtain the extent of damage of the fluid to be evaluated to core sample.
Specifically, to same core sample, when carrying out the experiment of compact sandstone gas reservoir sensitivity, front and rear rock is tested
Heart length, diameter, test gas viscosity and test pressure etc. do not change, and the variation of core sample gas flow can be with
Represent the variation of core permeability.The permeability impairment of rock core is larger, the core sample after the experiment of compact sandstone gas reservoir sensitivity
The product gas measurement of discharge degree that becomes smaller is larger.Wherein, core sample gas measurement of discharge can be indicated by core sample gas velocity measurement.
Further, the gas velocity measurement V obtained with simulated formation water saturation core sample measurement1On the basis of, only changing
The testing liquid of saturated core sample, remaining step all under the same conditions, obtain different gas velocity measurement V2, according to V1And V2
Rock core damage degree is obtained by calculation, evaluation result can more precisely.
Further, rock under original water saturation is characterized using the gas velocity measurement for simulating core sample under water saturation
The gas measurement of discharge of the heart obtains the extent of damage of the fluid to be evaluated to core sample by equation below one；
Wherein, V1The corresponding gas velocity measurement of representative simulation water flooding, unit are μ L/s；
V2The corresponding gas velocity measurement of fluid to be evaluated is represented, unit is μ L/s；
RdValue it is directly proportional to the extent of damage.
The present embodiment can be intuitively according to loss ratio RdThe size of value evaluates rock core damage degree.Referring to table 1, it is known that
Loss ratio RdValue it is bigger, rock core damage degree is more severe.Wherein, table 1 shows RdThe evaluation mark of value and rock core damage degree
It is accurate.
Table 1
| Loss ratio (%) | Rock core damage degree |
| Rd≤5 | Nothing |
| 5 ＜ Rd≤30 | It is weak |
| 30 ＜ Rd≤50 | It is medium on the weak side |
| 50 ＜ Rd≤70 | It is medium partially strong |
| 70 ＜ Rd≤90 | By force |
| Rd>90 | It is extremely strong |
The present embodiment compact sandstone gas reservoir sensitivity experimental evaluation method, by preparing core sample, to core sample
The first vacuumize process is carried out, and the first saturated process is carried out to core sample with simulated formation water, obtains the first saturated process
Core sample afterwards carries out the first centrifugal treating to the core sample after the first saturated process, until core sample is aqueous full
With degree Sw1Reach the original water saturation of reservoir.The gas of the core sample after the first centrifugal treating is tested under default displacement pressure
Velocity measurement V1.Second vacuumize process is carried out, and core sample is carried out at the second saturation with fluid to be evaluated to core sample
Reason, obtains the core sample after the second saturated process.Second centrifugal treating is carried out to the core sample after the second saturated process, directly
To the water saturation S of core samplew2Reach the original water saturation of reservoir.It is tested at the second centrifugation under default displacement pressure
The gas velocity measurement V of core sample after reason2.According to gas velocity measurement V1Gentle velocity measurement V2, fluid to be evaluated is obtained to core sample
The extent of damage.The present embodiment does not use only gas as tested media, meets gas reservoir percolation law, solves existing industry
In technical standard compact rock core liquid phase seepage flow it is difficult or can not seepage flow the problem of.Original water saturation is established using centrifugal process,
It avoids the volatilization of conventional gas drive easy liquid phase, the problem of salting-out crystallization, and overcomes single gas phase displacement test that cannot represent original place
Reservoir characteristic.Gas flow rate in rock core, passes through tight sand gas reservoir before and after soap-film microfluidic instrument detection sensitivity experiment simultaneously
The gas permeability extent of damage and pore structure characteristic of damage in flow velocity evaluation tight sand gas reservoir before and after sensitivity experiments,
So that rock core damage evaluation result is more accurate.
Fig. 4 is the flow chart of compact sandstone gas reservoir sensitivity evaluation test method embodiment two of the present invention, such as Fig. 4 institutes
Show, the present embodiment compact sandstone gas reservoir sensitivity experimental evaluation method further includes：
Step 201 is carrying out the first saturated process with simulated formation water to core sample, after obtaining the first saturated process
After core sample, the first nuclear magnetic resonance test is carried out to the core sample after the first saturated process, obtains the first nuclear magnetic resonance
T2 is composed.
Specifically, the present embodiment is after the core sample after step 101 obtains the first saturated process, using Nuclear Magnetic Resonance
First nuclear magnetic resonance test is carried out to the core sample after the first saturated process, obtains the first nuclear magnetic resonance T 2 spectrum.
Step 202 is carrying out the second saturated process with fluid to be evaluated to core sample, after obtaining the second saturated process
After core sample, the second nuclear magnetic resonance test is carried out to the core sample after the second saturated process, obtains the second nuclear magnetic resonance
T2 is composed.
Specifically, the present embodiment is after the core sample after step 104 obtains the second saturated process, using Nuclear Magnetic Resonance
Second nuclear magnetic resonance test is carried out to the core sample after the second saturated process, obtains the second nuclear magnetic resonance T 2 spectrum.
Wherein, carrying out step 201 needs after step 101, before step 102.It is corresponding, wherein, carrying out step 202 needs
After step 104, before step 105.
Step 203, according to the first nuclear magnetic resonance T 2 spectrum and the second nuclear magnetic resonance T 2 spectrum, obtain pore structure sensibility damage
Evil.
It will be understood by those skilled in the art that sensibility damage reality is exactly the damage of rock core internal pore structure, this reality
It applies example and characterizes reservoir sensitivity characteristic of damage using nuclear magnetic resonance, can deeply characterize the damage of pore structure.Wherein, nuclear-magnetism is common
Shake T2 relaxation time spectrums signal amplitude it is directly proportional to the intrapore water content of different pore size, under downfield, the T2 relaxation times
It is influenced by porous media pore size, T2 relaxation times and pore throat radius are proportional, and it is quick that T2 relaxation spectrums can characterize pore structure
The front and rear variation of perception damage.
Then, above-mentioned compact sandstone gas reservoir sensitivity experimental evaluation method is carried out by a specific example detailed
Thin explanation.
By taking carat revives gas field tight sand rock core as an example, according to well test data, the original water saturation of reservoir is 30%.Choosing
Two pieces of lithology, tight sand rock core similar in physical property is taken to evaluate the quick extent of damage of salt with the inventive method.No. 8-1 dry rock core gas is surveyed
Permeability is 0.012mD, and No. 11 dry rock core gas permeability are 0.008mD, and this area's formation water salinity is 193900mg/L.
It is as follows using the present embodiment compact sandstone gas reservoir sensitivity evaluation test method：
(1) piston-shaped core sample is drilled through, core sample length is more than 4cm, to the core sample washing oil desalinization of soil by flooding or leaching, drying；
(2) core sample is put into evacuation-high pressure saturation device, first core sample is vacuumized 12 hours or more, be put into
Simulated formation water.Using evacuation-high pressure saturation device high pressure saturated core 24 hours or more, saturation pressure is greater than 25MPa.
(3) core sample after saturation is put into Nuclear Magnetic Resonance, tests its nuclear magnetic resonance T 2 spectrum；
(4) core sample after saturation being centrifuged using supercentrifuge, centrifugal rotational speed is constant speed 10000r/min,
The centrifugation of rock core direction is exchanged in centrifugal process per 10min, ensures that pore water is evenly distributed, until rock core water containing saturability after centrifugation
It is 30%；
(5) to the core sample after centrifugation using soap-film microfluidic instrument, the testing rock core under the conditions of displacement pressure is 2MPa
Gas flow rate V1；
(6) step (2)-(5) are repeated, but simulated formation water is changed into fluid to be evaluated, wherein fluid to be evaluated is 3/4
Salinity water flooding, 1/2 salinity water flooding, 1/4 salinity water flooding, distilled water, so as to obtain different nuclear magnetic resonance T2
Spectrum and different V2Value.
(7) formula is usedCalculate loss ratio Rd, draw such as the following table 2 and Fig. 5, and draw such as Fig. 6 and
Fig. 7 observes different nuclear magnetic resonance T 2 spectrums.
Table 2
Fig. 5 be compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention the quick experimental evaluation of salt after flow ratio and
Curve graph between the water flooding of different salinities as shown in figure 5, with reference to Tables 1 and 2, can obtain 8-1 core samples difference
By water flooding, 3/4 salinity water flooding, 1/2 salinity water flooding, 1/4 salinity water flooding, distillation water saturation after for 24 hours after,
It is centrifuged again to prime stratum water saturation, it is respectively 1.12 μ L/s, 1.08 μ L/s, 1.06 μ L/ to measure core sample gas velocity measurement
S, 0.79 μ L/s, 0.77 μ L/s, the quick extent of damage of salt are 31.25%, illustrate that the quick extent of damage of salt of this block core sample is medium
It is on the weak side.
No. 11 core samples are respectively water flooding, 3/4 salinity water flooding, 1/2 salinity water flooding, 1/ by salinity
After 4 salinity water floodings, distillation water saturation for 24 hours after, then centrifuge to prime stratum water saturation, measure core sample gas measurement of discharge
Respectively 0.78 μ L/s, 0.70 μ L/s, 0.66 μ L/s, 0.56 μ L/s, 0.51 μ L/s, the quick extent of damage of salt are 34.62%, explanation
The quick extent of damage of salt of this block core sample is medium on the weak side.
Fig. 6 is T2 spectrograms one after the quick experimental evaluation of salt of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention,
Fig. 7 is T2 spectrograms two after the quick experimental evaluation of salt of compact sandstone gas reservoir sensitivity experimental evaluation method of the present invention, such as Fig. 6 and figure
Shown in 7, in conjunction with table 2, after saturation degree different experiments fluid to be measured, relaxation T2 spectrum of the relaxation time more than 1ms changes, and
Relaxation T2 spectrums less than 1ms do not change substantially.T2 relaxation time spectrums can reflect different Pore throat sizes, the relaxation of big pore throat
Time is longer, and the relaxation time of fine pore is shorter.Experimental result is mainly that the spectrum in long relaxation time changes, and illustrates carat
The quick damage of Soviet Union's gas field tight sand salt is mainly that macrovoid damages.
Meanwhile either 8-1 core samples or No. 11 core samples, core sample gas measurement of discharge ratio (velocity ratio
Value) it is identical with the variation tendency of T2 spectrums, illustrate that the present embodiment compact sandstone gas reservoir sensitivity experimental evaluation method is reliable, complete
Face.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of compact sandstone gas reservoir sensitivity evaluation test method, which is characterized in that including：
Core sample is prepared, the first vacuumize process is carried out, and with simulated formation water to the core sample to the core sample
Product carry out the first saturated process, obtain the core sample after the first saturated process；
First centrifugal treating is carried out to the core sample after first saturated process, until the core sample contains water saturation
Spend Sw1Reach the original water saturation of reservoir；
The gas velocity measurement V of the core sample after the first centrifugal treating is tested under default displacement pressure1；
Second vacuumize process is carried out, and carry out the second saturation to the core sample with fluid to be evaluated to the core sample
Processing, obtains the core sample after the second saturated process；
Second centrifugal treating is carried out to the core sample after second saturated process, until the core sample contains water saturation
Spend Sw2Reach the original water saturation of reservoir；
The gas velocity measurement V of the core sample after the second centrifugal treating is tested under the default displacement pressure2；
According to the gas velocity measurement V1With the gas velocity measurement V2, obtain damage of the fluid to be evaluated to the core sample
Degree.
It is 2. according to the method described in claim 1, it is characterized in that, described according to the gas velocity measurement V1With the gas velocity measurement
V2, the extent of damage of the fluid to be evaluated to the core sample is obtained, including：
The extent of damage of the fluid to be evaluated to the core sample is obtained by equation below one；
Wherein, V1The corresponding gas velocity measurement of representative simulation water flooding, unit are μ L/s；
V2The corresponding gas velocity measurement of fluid to be evaluated is represented, unit is μ L/s；
RdValue it is directly proportional to the extent of damage.
3. according to the method described in claim 1, it is characterized in that, to the core sample carry out the first vacuumize process, and
The first saturated process is carried out to the core sample with simulated formation water, obtains the core sample after the first saturated process, including：
The core sample is placed in vacuum chamber, the first preset duration of vacuumize process, it is small that first preset duration is more than 12
When；
Simulated formation water, the second preset duration of core sample described in saturation, institute under preset pressure are injected into the vacuum chamber
The second preset duration is stated more than 24 hours, the preset pressure is more than 25MPa；
Accordingly, the second vacuumize process is carried out to the core sample, and the core sample is carried out with fluid to be evaluated
Second saturated process obtains the core sample after the second saturated process, including：
The core sample is placed in vacuum chamber, the first preset duration described in vacuumize process；
Fluid to be evaluated is injected into the vacuum chamber, when core sample second is preset described in saturation under the preset pressure
It is long.
4. according to the method described in claim 1, it is characterized in that, the is carried out to the core sample after first saturated process
One centrifugal treating, until the water saturation S of the core samplew1Reach the original water saturation of reservoir, including：
First centrifugal treating is carried out to the core sample after first saturated process using supercentrifuge, until institute after centrifugation
State the water saturation S of core samplew1Reach the original water saturation of reservoir, and pore water is evenly distributed；
Accordingly, the second centrifugal treating is carried out to the core sample after second saturated process, until the core sample
Water saturation Sw2Reach the original water saturation of reservoir, including：
Second centrifugal treating is carried out to the core sample after second saturated process using supercentrifuge, until institute after centrifugation
State the water saturation S of core samplew2Reach the original water saturation of reservoir, and pore water is evenly distributed；
Wherein, during the first centrifugal treating and the second centrifugal treating, centrifugal rotational speed is constant speed 10000r/min, and every
10min exchanges rock core direction and centrifuges again.
5. according to the method described in claim 1, it is characterized in that, described test the first centrifugal treating under default displacement pressure
The gas velocity measurement V of core sample afterwards1, including：
Using soap-film microfluidic instrument, the gas of the core sample after the first centrifugal treating is tested under the conditions of displacement pressure is 2MPa is surveyed
Flow velocity V1；
Accordingly, the gas velocity measurement V of the core sample after the second centrifugal treating is tested under the default displacement pressure2, including：
Using soap-film microfluidic instrument, the gas of the core sample after the second centrifugal treating is tested under the conditions of displacement pressure is 2MPa is surveyed
Flow velocity V2。
6. according to the method described in claim 1, it is characterized in that, the core sample for obtaining drying includes：
Piston-shaped core sample is drilled through, the length of the core sample is more than 4 centimetres；
Washing oil and desalinization of soil by flooding or leaching processing are carried out to the core sample；
Drying and processing is carried out to the core sample, obtains the core sample of drying.
7. according to the method described in claim 1, it is characterized in that, carrying out first to the core sample with simulated formation water
Saturated process after obtaining the core sample after the first saturated process, further includes：
First nuclear magnetic resonance test is carried out to the core sample after first saturated process, obtains the first nuclear magnetic resonance T 2 spectrum；
Accordingly, second saturated process is being carried out to the core sample with fluid to be evaluated, after obtaining the second saturated process
After core sample, further include：
Second nuclear magnetic resonance test is carried out to the core sample after second saturated process, obtains the second nuclear magnetic resonance T 2 spectrum；
According to first nuclear magnetic resonance T 2 spectrum and second nuclear magnetic resonance T 2 spectrum, the damage of pore structure sensibility is obtained.
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