CN108801886A - Experimental method for lithologic acidification influence strength failure - Google Patents
Experimental method for lithologic acidification influence strength failure Download PDFInfo
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- 230000020477 pH reduction Effects 0.000 title claims abstract description 50
- 238000002474 experimental method Methods 0.000 title claims abstract description 27
- 238000002791 soaking Methods 0.000 claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000005260 corrosion Methods 0.000 claims description 18
- 230000007797 corrosion Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract 2
- 239000000523 sample Substances 0.000 description 184
- 230000001550 time effect Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N Formic acid Chemical compound OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 244000245420 ail Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 235000004611 garlic Nutrition 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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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
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The invention provides an experimental method for lithologic acidification influenced strength failure, which comprises the following steps: preparing core samples, wherein the number of the core samples is N, the shape and the size of each core sample are the same, and N is an integer greater than or equal to 2; respectively soaking the N rock core samples in acidizing fluid for different preset soaking times; removing the acidizing fluid from each of the core samples; respectively applying pressure to each core sample until each core sample is damaged, and respectively obtaining the limit pressure-bearing value of each core sample; and obtaining the strength failure influence of acidification on the core sample according to the limit pressure-bearing value of each core sample and the preset soaking time. The method can quantitatively analyze the strength failure influence of acidification on the reservoir rock.
Description
Technical field
The present invention relates to the experiment sides that oil/gas well development technique field more particularly to a kind of acidification of lithology influence intensity failure
Method.
Background technology
Oil/gas well in the process of development, generally requires to carry out Acidizing Technology to improve in-place permeability, to improve oil gas
Well production.
Wherein, rock matrix is the aggregate that particle or crystal are cementing mutually or are bonded together, and reservoir rock is through peracid
Property liquid impregnate after, the mineral grain or crystal of reservoir rock can be chemically reacted with acidic liquid, weaken reservoir rock
Connection between particle or crystal so that the strength reduction of reservoir rock, so as to cause reservoir rock shake out critical producing pressure drop drop
It is low, make reservoir be easier to shake out, production is impacted, therefore studies influence of the acidification to reservoir rock intensity failure there is weight
Want meaning.
Invention content
In view of this, the present invention provides a kind of experimental method of lithology acidification influence intensity failure, to realize quantitative analysis
It is acidified the influence to reservoir rock intensity failure.
In order to achieve the above objectives, present invention generally provides following technical solutions：
Being acidified the present invention provides a kind of lithology influences the experimental method of intensity failure, includes successively in accordance with the following steps：
Core sample is prepared, the quantity of the core sample is multiple, and each geomery phase of the core sample
Together, wherein N is the integer more than or equal to 2；
N number of core sample is impregnated into different default soaking times in acidifying solution respectively；
Remove the acidifying solution in each core sample；
Pressure is applied to each core sample respectively, until destroying each core sample, is obtained respectively each
The ultimate pressure capacity value of the core sample；
According to the ultimate pressure capacity value of each core sample and the default soaking time, acidification is obtained to the rock
The intensity failure of core sample influences.
Optionally, described that pressure is applied to each core sample respectively, specially：
Pressure is at the uniform velocity applied to each core sample respectively；In course of exerting pressure, every preset recording time record
The pressure value that the core sample is born.
Optionally, it is described by N number of core sample impregnated in acidifying solution respectively different default soaking times it
Before, further include：
The weight of each core sample is weighed respectively, and the weight of the core sample is the first weight at this time；
It is after acidifying solution in each core sample of the removing and described respectively to each core examination
Before sample applies pressure, further include：
The weight of each core sample is weighed respectively, and the weight of the core sample is the second weight at this time；
According to first weight and second weight, corrosion rate of the acidification to the core sample is obtained.
Optionally, described according to first weight and second weight, obtain corruption of the acidification to the core sample
Speed is lost, including：According to formula 1, the corrosion rate of the core sample is obtained,
In formula 1, W1For the first weight (g), W2For the second weight (g), K is preset constant, and A is the surface area of core sample
(m2), T is default soaking time (min), and D is the material density (g/cm of core sample3)；Core can be calculated according to above formula
The corrosion rate of sample.
Optionally, described that N number of core sample is impregnated into different default soaking times in acidifying solution respectively, specifically
For：
N number of core sample is separately immersed in the closed container equipped with acidifying solution, and each core sample
Impregnate different default soaking times.
Optionally, the acidifying solution removed in each core sample includes successively in accordance with the following steps：
It is rinsed by clear water and impregnates the core sample, wash off the acidifying solution in the core sample；
Extract the vacuum in the core sample；
Dry the core sample；
The core sample is cooled down in drier to room temperature.
Optionally, described to prepare core sample, include successively in accordance with the following steps：
Core is obtained by rock drill；
Pass sequentially through the core sample that stonecutter and stone mill are processed into the core cylinder or square column shape；
Clean the surface of the core sample；
Extract the vacuum in the core sample；
Dry the core sample；
The cooling core sample is until room temperature in drier.
Optionally, stonecutter and the stone mill of passing sequentially through is processed into cylinder or square column shape to the core
Core sample, including：
Make the flatness tolerance of the both ends of the surface of the core sample for 0.05mm by stone mill, and the core sample
Both ends of the surface are no more than 0.25 ° with the perpendicular maximum deviation of the central axis of the core sample respectively；
If the core is processed into the sample of cylindrical shape, it is 0.3mm to make the cylindricity tolerance of the core sample.
Optionally, it is described pressure is applied to each core sample respectively before, further include：
It is coated with oil reservoir in the both ends of the surface of each core sample；
It is described that pressure is applied to each core sample respectively, specially：
Pressure is vertically applied to the end face of each core sample by pressure testing machine.
Optionally, the quantity of the core sample is no less than 3.
A kind of lithology acidification provided by the invention influences the experimental method of intensity failure, by obtaining core sample through difference
Acidificatoin time after ultimate pressure capacity value, reflect the strength degree of core sample by acidificatoin time effect and rule,
To obtain influence of the acidification to core probe intensity failure, wherein core sample is obtained from reservoir to get to acidification to storing up
The intensity failure of layer rock influences.After obtaining ultimate pressure capacity value among the above, rock can be gone out by inverse by way of finite element and parsing
The mechanics parameters such as elasticity modulus, Poisson's ratio, cohesive force, internal friction angle and Biot coefficients after the acidification of core sample, to be determination
The critical pressure differential that shakes out of rock provides numerical value and supports after Reservoir Acidization.
Description of the drawings
Fig. 1 is the flow chart for the experimental method that a kind of lithology acidification provided in an embodiment of the present invention influences intensity failure；
Fig. 2 is the flow chart for the experimental method that another lithology acidification provided in an embodiment of the present invention influences intensity failure；
Fig. 3 is the flow for the experimental method that a kind of another lithology acidification provided in an embodiment of the present invention influences intensity failure
Figure.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the embodiment of the present invention provides a kind of experimental method of lithology acidification influence intensity failure, including：
S101, core sample is prepared, the wherein quantity of core sample is N number of, and the geomery phase of each core sample
Together, wherein N is the integer more than or equal to 2.
Obtain core in gas well at HTHP reservoir, generally drilled through by rock drill, it is processed be fabricated to it is required
Core sample, in the processing and making process of core-drilling and sample, the core sample of acquisition cannot have artificial crack.It prepares
Each core specimen shape size all same, is compared and analyzed with being convenient to the data obtained in subsequent experimental.
S102, N number of core sample is impregnated to different default soaking times in acidifying solution respectively.
Wherein, the group of the main body garlic in acidifying solution becomes：9%HCl+3%HCOOH+1.5%HF.
Such as the core sample of 3 identical size shapes is prepared, this 3 core samples are respectively placed in acidifying solution and are impregnated
24 hours, 48 hours and 72 hours, becomes sample after acidification, then carry out following step.
Acidifying solution in S103, each core sample of removing.
Core sample can be rinsed repeatedly with clear water, and core sample is immersed in clear water, can generally be impregnated 3 small
When, it is then rinsed repeatedly with clear water again, until no longer there is acidifying solution in core sample, this avoid acidifying solution residuals
Continue corrosion sample in core sample, so that core sample acidificatoin time is consistent with default soaking time, to make follow-up reality
Accurate comparative analysis can be carried out by testing the data of middle acquisition.
S104, pressure is applied to each core sample respectively, until destroying each core sample, obtains each core respectively
The ultimate pressure capacity value of sample.
Pressure slowly can uniformly be applied to each core sample by pressure testing machine, can easily be obtained from pressure testing machine
Pressing time and pressurization value are taken, when core sample is subject to crushing, records pressurization value at this time, i.e. ultimate pressure capacity value.Specifically, when
Rock core occur plastic deformation it is not resilient when, be as destroyed, can stop pressing.
S105, the ultimate pressure capacity value according to each core sample and default soaking time obtain acidification to core sample
Intensity failure influence.
For core sample after the acidification of different time, obtained ultimate pressure capacity value reflects the strength degree of sample, with
The acidification of core sample, intensity failure therewith compares the strength degree of each core sample, and combines each strength degree
Corresponding acidificatoin time can obtain intensity failure and the variation relation of acidificatoin time of core sample, that is, according to the N group (limit
Pressure-bearing value-presets soaking time) data, it can obtain and preset soaking time relationship song about the ultimate pressure capacity value-of core sample
Line, and then obtain being acidified intensity failure on core sample and influence, wherein core sample are obtained from reservoir to get to being acidified pair
The intensity failure of reservoir rock influences.
A kind of lithology acidification provided in an embodiment of the present invention influences the experimental method of intensity failure, by obtaining core sample
Ultimate pressure capacity value after different acidificatoin times, reflect the strength degree of core sample by acidificatoin time effect and
Rule, to obtain influence of the acidification to core probe intensity failure, wherein core sample is obtained from reservoir to get to acidification
The intensity failure of reservoir rock is influenced.After obtaining ultimate pressure capacity value among the above, can by way of finite element and parsing inverse
Go out the mechanics parameters such as elasticity modulus, Poisson's ratio, cohesive force, internal friction angle and Biot coefficients after the acidification of core sample, to for
Determine that the critical pressure differential that shakes out of rock after Reservoir Acidization provides numerical value and supports.
As shown in Fig. 2, an alternative embodiment of the invention provides a kind of experimental method of lithology acidification influence intensity failure,
Including：
S201, core sample is prepared, the wherein quantity of core sample is N number of, and the geomery phase of each core sample
Together, wherein N is the integer more than or equal to 2.
The specific descriptions of the step can refer to the corresponding description in the S101 in Fig. 1, and details are not described herein again.
S202, the weight for weighing each core sample respectively, the weight of core sample is the first weight at this time.
First weight is the weight before the acidification of core sample.
S203, N number of core sample is impregnated to different default soaking times in acidifying solution respectively.
Acidifying solution in S204, each core sample of removing.
The specific descriptions of S203 and S204 can be respectively with reference to the corresponding description in the S102 and S103 in figure 1, herein no longer
It repeats.
S205, the weight for weighing each core sample respectively, the weight of core sample is the second weight at this time.
Second weight is the weight after the acidification of core sample.
S206, according to the first weight and the second weight, obtain corrosion rate of the acidification to core sample.
The difference of first weight and the second weight is the front and back weight difference of core sample acidification, and rock can be obtained by the difference
Corruption of the different acidificatoin times to core sample can be obtained in conjunction with the different acidificatoin time of core sample in the corrosion condition of core sample
Lose situation.That is, according to N groups (weight difference-presets soaking time) data, can obtain default about the weight difference-of core sample
Soaking time relation curve.
Specifically, according to formula 1,
W in formula 11For the first weight, W2For the second weight, K is preset constant, and A is the surface area of core sample, and T is default
Soaking time, D are the material density of core sample；The corrosion rate of core sample can be calculated according to equation 1 above, corrosion speed
Degree can be used as foundation of the acidification to rock extent of corrosion.Likewise, according to N groups (corrosion rate-presets soaking time) data, energy
Enough obtain presets soaking time relation curve about the corrosion rate-of core sample.Wherein, K is empirical.
S207, pressure is at the uniform velocity applied to each core sample respectively, in course of exerting pressure, every preset recording time record
The pressure value that core sample is born obtains the ultimate pressure capacity value of each core sample respectively until destroying each core sample.
Such as the time per 20s just records the pressure value that core sample is born, and can get the core sample after acidification
Compression changing rule.
S208, the ultimate pressure capacity value according to each core sample and default soaking time obtain acidification to core sample
Intensity failure influence.
The specific descriptions of S208 can refer to the corresponding description in the S105 in Fig. 1, and details are not described herein again.
Lithology acidification provided in an embodiment of the present invention influences the experimental method of intensity failure, by obtaining core sample through not
Ultimate pressure capacity value after same acidificatoin time, reflects the strength degree of core sample by acidificatoin time effect and rule
Rule, and the weight change front and back by comparing the acidification of core sample, can obtain being acidified the corrosion condition to core sample, wherein
Corrosivity also has the intensity of core sample certain influence, therefore realizes and be acidified to core probe intensity by multifactor acquisition
The influence of failure, wherein core sample are obtained from reservoir, that is, realize shadow of the quantitative analysis acidification to reservoir rock intensity failure
It rings.
As shown in figure 3, an alternative embodiment of the invention provides a kind of experimental method of lithology acidification influence intensity failure,
Including：
S301, core is obtained by rock drill.
S302, the core sample that stonecutter and stone mill are processed into core cylinder or square column shape is passed sequentially through；
The quantity of core sample is N number of, and the geomery of each core sample is identical, and wherein N is the integer more than or equal to 2.
Specifically, the quantity of core sample is no less than 3.More core sample is prepared for obtaining more experiment pair
Than data, stronger support is subsequently to the analysis of experimental result.
Specifically, the machining accuracy of the core sample of cylinder or square column shape needs to meet：Make core by stone mill
The flatness tolerance of the both ends of the surface of sample be 0.05mm, and the both ends of the surface of core sample respectively with the central axis phase of core sample
Vertical maximum deviation is no more than 0.25 °；If core is processed into the sample of cylindrical shape, keep the cylindricity of core sample public
Difference is 0.3mm.
S303, the surface for cleaning core sample.
The dust of core specimen surface can be removed with hairbrush and loosen particle etc..
Vacuum in S304, extraction core sample.
Avoid in core sample that there are vacuum to make core sample is inside and outside to form pressure difference, so that the experimental data subsequently obtained is more
Add reliable.
S305, drying core sample.
Core sample can be put in an oven through 24 hours drying and processings, avoid residual liquid in core sample.
S306, core sample is cooled down in drier until room temperature.
Core sample is placed in drier, has moisture sucking to prevent core sample to be cooled in room temperature process.
S307, the weight for weighing each core sample respectively, the weight of core sample is the first weight at this time.
First weight is the weight before the acidification of core sample.
S308, N number of core sample is separately immersed in the closed container equipped with acidifying solution, and each core sample impregnates
Different default soaking times.
Multiple closed containers can be set and be loaded with acidifying solution respectively, closed container can avoid the volatilization of acidifying solution and avoid
Environment is polluted, a core sample is placed in each closed container, and timing is impregnated.
S309, core sample is rinsed and impregnated by clear water, wash off the acidifying solution in core sample.
Core sample can be rinsed repeatedly with clear water, and core sample is immersed in clear water, can generally be impregnated 3 small
When, it is then rinsed repeatedly with clear water again, until no longer there is acidifying solution in core sample.
Vacuum in S310, extraction core sample.
S311, drying core sample.
S312, core sample is cooled down in drier to room temperature.
S310 to S312 is identical as S304 to S306 respectively, and effect is also identical, and details are not described herein again.
S313, the weight for weighing each core sample respectively, the weight of core sample is the second weight at this time.
Second weight is the weight after the acidification of core sample.
S314, according to the first weight and the second weight, obtain corrosion rate of the acidification to core sample.
The specific descriptions of the step can refer to the corresponding description in the S206 in Fig. 2, and details are not described herein again.
S315, it is coated with oil reservoir in the both ends of the surface of each core sample.
Relatively thin oil reservoir can be applied, so that when pressure testing machine pressurizes to the end face of core sample, reduces pressure testing
The friction of machine and core sample end face.
S316, pressure is vertically applied to the end face of each core sample by pressure testing machine, it is every in course of exerting pressure
The pressure value that preset recording time record core sample is born obtains each core respectively until destroying each core sample
The ultimate pressure capacity value of sample.
S317, the ultimate pressure capacity value according to each core sample and default soaking time obtain acidification to core sample
Intensity failure influence.
S316's and S317 specifically describes the description that can refer to corresponding steps in above-described embodiment respectively, no longer goes to live in the household of one's in-laws on getting married herein
It states.
Lithology acidification provided in an embodiment of the present invention influences the experimental method of intensity failure, by obtaining core sample through not
Ultimate pressure capacity value after same acidificatoin time, reflects the strength degree of core sample by acidificatoin time effect and rule
Rule, and the weight change front and back by comparing the acidification of core sample, can obtain being acidified the corrosion condition to core sample, wherein
Corrosivity also has the intensity of core sample certain influence, therefore realizes and be acidified to core probe intensity by multifactor acquisition
The influence of failure, wherein core sample are obtained from reservoir, that is, realize shadow of the quantitative analysis acidification to reservoir rock intensity failure
It rings.
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
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of lithology acidification influences the experimental method of intensity failure, which is characterized in that include successively in accordance with the following steps：
Core sample is prepared, the quantity of the core sample is N number of, and the geomery of each core sample is identical,
Middle N is the integer more than or equal to 2；
N number of core sample is impregnated into different default soaking times in acidifying solution respectively；
Remove the acidifying solution in each core sample；
Pressure is applied to each core sample respectively, until destroying each core sample, is obtained respectively each described
The ultimate pressure capacity value of core sample；
According to the ultimate pressure capacity value of each core sample and the default soaking time, obtains acidification and the core is tried
The intensity failure of sample influences.
2. experimental method according to claim 1, which is characterized in that described to apply pressure to each core sample respectively
Power, specially：
Pressure is at the uniform velocity applied to each core sample respectively；
In course of exerting pressure, every preset recording time records the pressure value that the core sample is born.
3. experimental method according to claim 1 or 2, which is characterized in that
It is described N number of core sample is impregnated into different default soaking times in acidifying solution respectively before, further include：
The weight of each core sample is weighed respectively, and the weight of the core sample is the first weight at this time；
After the acidifying solution removed in each core sample and described each core sample is applied respectively
Before plus-pressure, further include：
The weight of each core sample is weighed respectively, and the weight of the core sample is the second weight at this time；
According to first weight and second weight, corrosion rate of the acidification to the core sample is obtained.
4. experimental method according to claim 3, which is characterized in that described according to first weight and second weight
Amount obtains corrosion rate of the acidification to the core sample, including：According to formula 1, the corrosion rate of the core sample is obtained,
In formula 1, W1For the first weight (g), W2For the second weight (g), K is preset constant, and A is the surface area (m of core sample2),
T is default soaking time (min), and D is the material density (g/cm of core sample3)；Core sample can be calculated according to above formula
Corrosion rate.
5. experimental method according to claim 1, which is characterized in that described to be acidified N number of core sample respectively
Different default soaking times is impregnated in liquid, specially：
N number of core sample is separately immersed in the closed container equipped with acidifying solution, and each core sample impregnates
Different default soaking times.
6. experimental method according to claim 1, which is characterized in that
The acidifying solution removed in each core sample includes successively in accordance with the following steps：
It is rinsed by clear water and impregnates the core sample, wash off the acidifying solution in the core sample；
Extract the vacuum in the core sample；
Dry the core sample；
The core sample is cooled down in drier to room temperature.
7. experimental method according to claim 1, which is characterized in that
It is described to prepare core sample, include successively in accordance with the following steps：
Core is obtained by rock drill；
Pass sequentially through the core sample that stonecutter and stone mill are processed into the core cylinder or square column shape；
Clean the surface of the core sample；
Extract the vacuum in the core sample；
Dry the core sample；
The cooling core sample is until room temperature in drier.
8. experimental method according to claim 7, which is characterized in that stonecutter and the stone mill of passing sequentially through is to described
Core is processed into the core sample of cylinder or square column shape, including：
Make the flatness tolerance of the both ends of the surface of the core sample for 0.05mm by stone mill, and the both ends of the core sample
Face is no more than 0.25 ° with the perpendicular maximum deviation of the central axis of the core sample respectively；
If the core is processed into the sample of cylindrical shape, it is 0.3mm to make the cylindricity tolerance of the core sample.
9. experimental method according to claim 8, which is characterized in that apply respectively to each core sample described
Before pressure, further include：
It is coated with oil reservoir in the both ends of the surface of each core sample；
It is described to be specially to each core sample application pressure respectively：By pressure testing machine to each core sample
End face vertically apply pressure.
10. experimental method according to claim 9, which is characterized in that the quantity of the core sample is no less than 3.
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| CN201710306341.5A CN108801886A (en) | 2017-05-03 | 2017-05-03 | Experimental method for lithologic acidification influence strength failure |
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| CN109738313A (en) * | 2019-01-28 | 2019-05-10 | 中国科学院武汉岩土力学研究所 | A kind of method for testing and analyzing of rocky erosion depth and mechanical property degradation |
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| CN102011580A (en) * | 2010-11-08 | 2011-04-13 | 西南石油大学 | Method for predicting failure pressure of reservoir with acid damage |
| CN104729924A (en) * | 2015-03-10 | 2015-06-24 | 中石化石油工程技术服务有限公司 | Rock core strength testing instrument and method |
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| CN109738313A (en) * | 2019-01-28 | 2019-05-10 | 中国科学院武汉岩土力学研究所 | A kind of method for testing and analyzing of rocky erosion depth and mechanical property degradation |
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