CN112179769A - Shale elastic modulus evaluation method based on rock debris micro-nano indentation experiment - Google Patents
Shale elastic modulus evaluation method based on rock debris micro-nano indentation experiment Download PDFInfo
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Abstract
The invention discloses a shale elastic modulus evaluation method based on a rock debris micro-nano indentation experiment, which comprises the following steps of: preparing a rock debris sample of the shale reservoir; carrying out a rock debris micron or nanometer indentation experiment on a rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs; respectively obtaining the maximum press-in load, the maximum press-in depth, the loading work and the unloading work of each group of indentation experiment load-displacement curve graphs; respectively calculating the shale elastic modulus corresponding to each group of indentation experiment load-displacement curves according to the parameters and the shale elastic modulus prediction model under the micro or nano indentation test condition; and finally, obtaining an average value of the elastic moduli of the plurality of shales, wherein the average value is the shale elastic modulus of the shale reservoir. The parameters obtained by the method can be directly used for shale drilling well wall stability analysis, drill bit design and optimization, can also effectively guide hydraulic fracturing segmentation, fracturing design and fracturing construction of the shale horizontal well, and have great significance for shale gas drilling and hydraulic pressure.
Description
Technical Field
The invention relates to a shale elasticity modulus evaluation method based on a rock debris micro-nano indentation experiment, and belongs to the technical field of oil exploration and development.
Background
In recent years, the capacity of clean energy in China is continuously expanded, an energy system with clean and low carbon is being rapidly constructed, natural gas is used as the cleanest energy in the traditional petrochemical energy, the demand is continuously increased, and shale gas becomes the core growth point of the natural gas industry in China. In the shale gas exploration and development process, the rock mechanical properties of a shale reservoir are key factors influencing the safe, efficient and economic exploitation of shale oil and gas. The mechanical characteristics and the distribution rule of the shale are required to be mastered in the whole exploration and development process: in the exploration process, the elastic modulus and the anisotropy thereof have obvious influence on seismic data interpretation and geological model establishment, and accurate understanding of shale characteristics is helpful for eliminating the influence; in the drilling process, the shale elastic modulus is the basis for calculating mechanical parameters such as ground stress, rock strength and the like, is closely related to engineering problems such as borehole wall instability (well collapse and well leakage), low mechanical drilling speed and the like, and accurately masters the mechanical parameters such as the shale elastic modulus and the like, thereby being beneficial to preventing underground complexity and accidents and improving the drilling efficiency; in the exploitation process, the shale elastic modulus is a key parameter influencing brittleness and compressibility, the influences on well completion segmentation, compressibility evaluation, fracturing design and evaluation, proppant selection and the like are obvious, the accurate control of mechanical parameters such as the shale elastic modulus is helpful for optimizing well completion and fracturing schemes, the fracturing yield increase and transformation effect is improved, and further the shale oil and gas recovery ratio is improved. Therefore, in the whole process of shale oil-gas exploration and development, the mechanical parameters such as the shale elastic modulus and the like have very important functions and positions.
The method for acquiring the elastic modulus of the shale is various, and the methods mainly adopted by the petroleum industry comprise three types of indoor experiments, well logging methods and geophysical prospecting methods:
(1) indoor experiments: the method mainly comprises uniaxial experiment means, triaxial experiment means and the like, but the indoor experiment has strict requirements on the size of a sample, the rock mechanical characteristics also have obvious size effect, and due to strong brittleness, bedding and fracture development of shale, the standard rock sample is difficult to prepare, and the preparation success rate is low; in addition, most indoor experiments cannot adopt underground rock cores to carry out comprehensive tests, so that the experiments have serious randomness and difference; in addition, the indoor experiment can not obtain continuous rock mechanical parameter profiles (especially for shale reservoir horizontal wells), and the obtained data has great limitation on engineering practicability.
(2) The well logging method comprises the following steps: according to a longitudinal and transverse wave propagation theory in an elastic medium, elastic mechanical parameters such as dynamic elastic modulus of shale can be directly calculated through longitudinal and transverse wave velocity, and a static elastic modulus parameter profile is obtained through dynamic and static conversion, but the horizontal well logging difficulty is high, the risk is high, and domestic horizontal well logging still has certain difficulty; for example, the traction force of the underground crawler is limited, and in addition, the horizontal section of the well bore is upwarped, so that the frictional resistance generated by the cable in the three-dimensional horizontal well is difficult to overcome, and the horizontal section of the well can only be generally measured by about 200-400 m; the drilling rod transmission logging process is relatively complex, risks such as drill sticking and drill burying exist, time consumption is long, cost is high, and the drilling rod transmission logging process is rarely adopted; in addition, the over-drill logging technology can take the advantages of cable and transmission logging into account, but is still in the research and development stage at home and is not popularized and applied yet.
(3) The geophysical prospecting method comprises the following steps: in recent years, geophysical prospecting techniques have also been used to predict formation rock mechanics parameters. For example, seismic data invert rock elastic mechanical parameters, but the two-dimensional and three-dimensional earthquakes have large scale and low precision, so that the accuracy of an inversion result is difficult to guarantee, and the inversion result is only used for reference made by drilling and completion and fracturing operation measures at present.
It is therefore readily apparent that the petroleum industry has developed a series of rock elasto-mechanical property characterization methods based on uniform continuous medium mechanics, such as indoor experiments, well logging methods, geophysical prospecting methods, and the like; however, due to the limitations of difficult core acquisition, the detection equipment level and the operation risk, the acquisition of the elastic mechanical parameters of the shale horizontal well is still difficult, and particularly, the horizontal well rock mechanical parameter profile meeting the engineering requirements is difficult to obtain.
Disclosure of Invention
The invention mainly overcomes the defects in the prior art, and aims to provide a shale elasticity modulus evaluation method based on a debris micro-nano indentation experiment.
The technical scheme provided by the invention for solving the technical problems is as follows: a shale elastic modulus evaluation method based on a rock debris micro-nano indentation experiment comprises the following steps:
s10, preparing a rock fragment sample of the shale reservoir;
s20, carrying out a rock debris micro indentation experiment or a nano indentation experiment on a rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs;
s30, respectively obtaining the maximum indentation load P of each group of indentation experiment load-displacement curve graphsmMaximum penetration depth hmLoading work WtUnloading work We；
S40, respectively calculating the shale elastic modulus corresponding to each group of indentation experiment load-displacement curves according to the parameters and the shale elastic modulus prediction model under the micro indentation test condition or the shale elastic modulus prediction model under the nano indentation test condition; finally, the average value of the elastic moduli of the plurality of shales is obtained, and the average value is the shale elastic modulus of the shale reservoir;
the shale elastic modulus calculation model under the micron indentation test condition is as follows:
micro indentation test condition Hn/ErAnd We/WtSatisfies the following relationship:
in the formula: erThe reduced Young modulus of the pressure head and the pressed material; hnNominal hardness; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in;
and the reduced Young's modulus E of the indenter and the pressed materialrCan be expressed as:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiYoung's modulus of a diamond indenter; upsilon isiPoisson's ratio for diamond indenters;
bringing formula (2) into formula (1) and combining the contact area function A (h)m) Obtaining a shale elastic modulus calculation model under the condition of a micron indentation test:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiThe Young modulus of the diamond pressure head is 1141 GPa; upsilon isi007 is taken as the Poisson ratio of the diamond pressure head; h ismMaximum press-in depth; pmThe maximum press-in load; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in.
The shale elastic modulus calculation model under the nano indentation test condition is as follows:
h under nano indentation test conditionn/ErAnd We/WtSatisfies the following relationship:
in the formula: erThe reduced Young modulus of the pressure head and the pressed material; hnNominal hardness; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in;
and the reduced Young modulus Er of the pressing head and the pressed material can be expressed as:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiYoung's modulus of a diamond indenter; upsilon isiIs the poisson ratio of the diamond indenter.
Bringing formula (4) into formula (3) and combining the contact area function A (h)m) Obtaining a shale elastic modulus calculation model under the condition of a micron indentation test:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiThe Young modulus of the diamond pressure head is 1141 GPa; upsilon isi007 is taken as the Poisson ratio of the diamond pressure head; h ismMaximum press-in depth; pmThe maximum press-in load; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in.
The further technical scheme is that the specific preparation process of the step S10 is as follows:
s11, collecting rock debris of the shale reservoir and drying the rock debris;
s12, heating the epoxy resin adhesive and the modified amine hardener to 40 ℃, and then mixing the epoxy resin adhesive and the modified amine hardener in a mass ratio of 3: 1, mixing, fully fusing to form mixed glue, and pouring into a mold;
s13, embedding the dried rock debris into a mold, enabling the rock debris to be in full contact with the mixed glue, standing for more than 24 hours, and obtaining a cemented sample after foams in the mixed glue are eliminated and completely cured;
s14, demolding the cemented rock debris sample, mechanically cutting the cemented rock debris sample, and polishing the cut rock debris sample;
and S15, after polishing, processing the surface of the rock debris sample by using a three-ion beam cutting instrument to change the surface into a flat and smooth high-quality section.
The further technical scheme is that in the step S14, the grinding is carried out through a sand disc, and the roughness of the sand disc is gradually refined from 100 meshes to 5000 meshes.
The further technical scheme is that the micron indentation experiment in the step S20 specifically comprises the following steps: loading the surface of the rock debris sample at a constant loading rate of 15N/min, stopping loading and unloading when the surface is loaded to the maximum load of 50N, and obtaining the changes of the load and the loading depth; and performing a gridding lattice experiment on the surface of the rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs.
The further technical scheme is that the nano indentation experiment in the step S20 specifically comprises the following steps: loading the surface of the rock debris sample at a constant loading rate of 20N/min, stopping loading and unloading when the surface is loaded to the maximum load of 400N, and acquiring the changes of the load and the loading depth; and performing a gridding lattice experiment on the surface of the rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs.
The further technical scheme is that the specific process of the step S30 is as follows: directly obtaining the maximum indentation load P from the indentation experiment load-displacement curve chartmMaximum penetration depth hm(ii) a Then, the loading work W is calculated according to the following formulatUnloading work We；
In the formula: wtIs the loading work; weTo unload work; h ismMaximum press-in depth; p is the loading force at any depth in the loading process; dh is the loading depth step value; h isfTo unload the maximum residual depth.
The further technical scheme is that in the step S20, a rock debris micron indentation experiment is carried out on a rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs; in the step S40, the shale elastic modulus corresponding to each group of indentation experiment load-displacement curves is respectively calculated according to the shale elastic modulus prediction model under the micron indentation test condition.
The invention has the following beneficial effects: the parameters obtained by the method can be directly used for shale drilling well wall stability analysis, drill bit design and optimization, can also effectively guide hydraulic fracturing segmentation, fracturing design and fracturing construction of the shale horizontal well, and have great significance for shale gas drilling and hydraulic pressure.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a sample of the collected processed shale cuttings;
FIG. 3 is a sample of shale cuttings after cementing and curing;
FIG. 4 is a sample of surface treated shale cuttings;
FIG. 5 is an electron microscope scanning photograph of a sample of shale debris after surface treatment;
FIG. 6 is a schematic view of a load-displacement curve recorded during loading and unloading;
FIG. 7 is a schematic view of the deformation of the surface of a sample in different loading and unloading states;
FIG. 8 is a load-displacement curve recorded from a micro indentation experiment;
FIG. 9 is a load-displacement curve recorded from a nanoindentation experiment;
FIG. 10 is an energy analysis schematic diagram of a micro-nano indentation load-displacement curve;
FIG. 11 is a statistical histogram of elastic modulus obtained from the micro indentation evaluation;
fig. 12 is a statistical histogram of the elastic modulus obtained from the nanoindentation evaluation.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
As shown in fig. 1, the shale elastic modulus evaluation method based on the rock debris micro-nano indentation experiment of the invention comprises the following steps:
s1, collecting a rock debris sample of the shale reservoir, selecting rock debris which is regular in shape, has a size not less than 2mm and has no obvious cracks, cleaning surface dust, and drying in a vacuum drying box, wherein the processed rock debris sample is shown in figure 2;
s2, heating the epoxy resin adhesive and the modified amine hardener to 40 ℃, and then mixing the epoxy resin adhesive and the modified amine hardener in a mass ratio of 3: 1, mixing, fully fusing to form mixed glue, and pouring into a mold;
s3, embedding the screened rock debris sample, enabling the rock debris sample to be in full contact with the mixed glue, standing for more than 24 hours, and obtaining a cemented rock debris sample after foams in the mixed glue are eliminated and completely cured, wherein the cemented rock debris sample is shown in figure 3;
s4, demolding and mechanically cutting after the rock debris sample is fully cemented, and polishing the cut rock debris sample by using a sand table, wherein the roughness of the sand table is gradually refined from 100 meshes to 5000 meshes;
s5, after the mechanical polishing is finished, processing the surface of the rock debris sample by using a three-ion beam cutting instrument to obtain a flat and smooth high-quality section, as shown in figure 4;
s6, scanning by an electron microscope, as shown in figure 5, after determining that the surface roughness of the rock debris sample meets the requirements of the micro-nano indentation experiment, rapidly packaging the rock debris sample for later use to avoid the contact of the sample to be detected with liquid and dust in the air;
s7, adopting an MFT-4000 type multifunctional material surface property tester, selecting a Bohr pressure head, and keeping the contact position of the pressure head and the rock debris sample to be more than 2mm from the rock debris boundary;
s8, enabling a pressure head to approach the surface of the rock debris sample at a constant speed, loading at a constant loading speed of 15N/min when the pressure head is in contact with the surface of the rock debris sample, stopping loading and unloading when the pressure head is loaded to a maximum load of 50N, and recording changes of the load and the loading depth, wherein fig. 6 shows a load-displacement curve recorded in the loading and unloading process, and fig. 7 shows a sample surface deformation schematic diagram in different loading and unloading states;
s9, performing a gridding lattice experiment on the surface of the rock debris sample to obtain 136 groups of micro indentation experiment load-displacement curves, wherein a part of micro indentation experiment load-displacement curves obtained by the experiment are shown in FIG. 8;
s10, determining the maximum press-in load PmSaid maximum press-in load PmThe maximum indentation load is the maximum indentation load of a micrometer indentation experiment load-displacement curve;
s11, determining the maximum press-in depth hmSaid maximum penetration depth hmThe maximum indentation depth is the maximum indentation depth of a micro indentation experiment load-displacement curve;
s12, determining nominal hardness HnSaid nominal hardness HnCan be driven by the maximum press-in load PmAnd the projected area A (h) of contactm) And calculating to obtain:
in the formula: hnNominal hardness; a (h)m) As a function of projected area of indenter contact, the function of contact area for a bosch indenter is:
s13, determining the loading work WtThe load work WtThe area of OABD in the micrometer indentation test load-displacement curve is shown in fig. 10, i.e.:
in the formula: wtIs the loading work; sOABDIs the area encompassed by curve OABD; h ismMaximum press-in depth; p is the loading force at any depth in the loading process; dh is the loading depth step value;
s14, determining unloading work WeThe unloading work WeThe area of BCD in the micro indentation test load-displacement curve, as shown in fig. 10, is:
in the formula: weTo unload work; sBCDIs the area encompassed by curve BCD; h isfTo unload the maximum residual depth;
s15, determining dissipation energy WirSaid dissipated energy WirThe area of the OABC in the micron indentation test load-displacement curve is shown in fig. 10, i.e.:
in the formula: wirRepresents the difference between the load work and the unload work as dissipated energy; sOABCIs the area encompassed by curve OABC;
s16, determining the press-in ratio work We/WtThe press-in specific work We/WtCan be loaded with work WtAnd the work of unloading WeAnd calculating to obtain:
in the formula: we/WtFor specific work of pressing-in, representing work of unloading WeAnd the loading work WtThe ratio therebetween;
s17, selecting a shale elastic modulus prediction model under a micron indentation test condition according to test and analysis requirements, calculating the shale elastic modulus, and performing statistical analysis to obtain a shale elastic modulus average value;
aiming at the micro indentation test result, the shale elastic modulus calculation model under the micro indentation test condition is as follows:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiThe Young modulus of the diamond pressure head is 1141 GPa; upsilon isi007 is taken as the Poisson ratio of the diamond pressure head; h ismMaximum press-in depth; pmThe maximum press-in load; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in;
the maximum indentation depth h obtained by 136 groups of micrometer indentation experimentsmMaximum press-in load PmPress-in specific work We/WttNominal hardness HnElastic modulus E of diamond indenteriA diamond head Poisson ratio upsilon of 1141GPaiParameters such as 0.07 and 0.25 of the poisson ratio υ of the shale are substituted into a shale elastic modulus calculation model under the micron indentation test condition, a statistical histogram of the shale elastic modulus is obtained through calculation, as shown in fig. 11, the average value of the shale elastic modulus is 37.85GPa, the elastic modulus obtained through macroscopic test is 37.30GPa, and the deviation between the two is 1.5%, which shows that the shale elastic modulus can be evaluated very accurately by the method.
Example 2
The invention discloses a shale elastic modulus evaluation method based on a rock debris micro-nano indentation experiment, which comprises the following steps of:
s10, preparing a rock debris sample of the shale reservoir by adopting the same steps in the example 1;
s20, adopting an Agilent U9820A Nano enter G200 Nano Indenter, selecting a Bo' S pressure head, and keeping the contact position of the pressure head and the rock debris sample to be more than 2mm from the rock debris boundary;
s30, a control system is utilized to enable a pressure head to approach the surface of the rock debris sample at a constant speed, when the pressure head is in contact with the surface of the rock debris sample, loading is carried out at a constant loading speed of 20mN/min, loading is stopped and unloading is carried out when the maximum load is 400mN, and the system automatically records the changes of the load and the loading depth;
s40, performing a gridding lattice experiment on the surface of the sample to obtain 117 groups of nano indentation experiment load-displacement curves, wherein fig. 9 shows the load-displacement curves of part of the nano indentation experiment obtained by the experiment;
s50, obtaining the maximum indentation load P of each of the 117 sets of nano-indentation experiment load-displacement graphs by respectively adopting the same steps in the example 1mMaximum penetration depth hmLoading work WtUnloading work WeAnd dissipation energy WirPress-in specific work We/WtNominal hardness Hn；
S60, selecting a shale elastic modulus prediction model under a nano indentation test condition according to test and analysis requirements, calculating the shale elastic modulus, and performing statistical analysis to obtain a shale elastic modulus average value;
aiming at the nano indentation test result, the shale elastic modulus calculation model under the nano indentation test condition is as follows:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiThe Young modulus of the diamond pressure head is 1141 GPa; upsilon isi007 is taken as the Poisson ratio of the diamond pressure head; h ismMaximum press-in depth; pmThe maximum press-in load; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in;
the maximum indentation depth h obtained by 117 groups of nano indentation experimentsmMaximum press-in load PmSpecific power We/WtNominal hardness HnElastic modulus E of diamond indenteriA diamond head Poisson ratio upsilon of 1141GPaiSubstituting parameters such as 0.07, 0.25 and the like of the shale Poisson ratio upsilon into a shale elastic modulus calculation model under the nano indentation test condition, and calculating to obtain a shale elastic modulus statistical histogram as shown in the figure12, the average value of the shale elastic modulus is 216.19MPa, the elastic modulus obtained by a macroscopic test is 32.85GPa, and the deviation between the two values is 11.9%, which shows that the shale elastic modulus can be evaluated more accurately by the invention.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (7)
1. A shale elastic modulus evaluation method based on a rock debris micro-nano indentation experiment is characterized by comprising the following steps:
s10, preparing a rock fragment sample of the shale reservoir;
s20, carrying out a rock debris micro indentation experiment or a nano indentation experiment on a rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs;
s30, respectively obtaining the maximum indentation load P of each group of indentation experiment load-displacement curve graphsmMaximum penetration depth hmLoading work WtUnloading work We；
S40, respectively calculating the shale elastic modulus corresponding to each group of indentation experiment load-displacement curves according to the parameters and the shale elastic modulus prediction model under the micro indentation test condition or the shale elastic modulus prediction model under the nano indentation test condition; finally, the average value of the elastic moduli of the plurality of shales is obtained, and the average value is the shale elastic modulus of the shale reservoir;
the shale elastic modulus calculation model under the micron indentation test condition is as follows:
the shale elastic modulus calculation model under the nano indentation test condition is as follows:
in the formula: e is the Young modulus of the tested shale; upsilon is the Poisson's ratio of the tested shale; eiThe Young modulus of the diamond pressure head is 1141 GPa; upsilon isi007 is taken as the Poisson ratio of the diamond pressure head; h ismMaximum press-in depth; pmThe maximum press-in load; weTo unload work; wtIs the loading work; we/WtThe specific work of pressing in.
2. The shale elasticity modulus evaluation method based on the rock debris micro-nano indentation experiment according to claim 1, wherein the specific preparation process of the step S10 is as follows:
s11, collecting rock debris of the shale reservoir and drying the rock debris;
s12, heating the epoxy resin adhesive and the modified amine hardener to 40 ℃, and then mixing the epoxy resin adhesive and the modified amine hardener in a mass ratio of 3: 1, mixing, fully fusing to form mixed glue, and pouring into a mold;
s13, embedding the dried rock debris into a mold, enabling the rock debris to be in full contact with the mixed glue, standing for more than 24 hours, and obtaining a cemented sample after foams in the mixed glue are eliminated and completely cured;
s14, demolding the cemented rock debris sample, mechanically cutting the cemented rock debris sample, and polishing the cut rock debris sample;
and S15, after polishing, processing the surface of the rock debris sample by using a three-ion beam cutting instrument to change the surface into a flat and smooth high-quality section.
3. The shale elasticity modulus evaluation method based on the rock debris micro-nano indentation experiment as claimed in claim 2, wherein the polishing is performed by a sand table in the step S14, and the roughness of the sand table is gradually refined from 100 meshes to 5000 meshes.
4. The shale elasticity modulus evaluation method based on the rock debris micro-nano indentation experiment as claimed in claim 2, wherein the micro-nano indentation experiment in the step S20 comprises the following specific steps: loading the surface of the rock debris sample at a constant loading rate of 15N/min, stopping loading and unloading when the surface is loaded to the maximum load of 50N, and obtaining the changes of the load and the loading depth; and performing a gridding lattice experiment on the surface of the rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs.
5. The shale elasticity modulus evaluation method based on rock debris micro-nano indentation experiment according to claim 2, wherein the specific steps of the nano indentation experiment in the step S20 are as follows: loading the surface of the rock debris sample at a constant loading rate of 20N/min, stopping loading and unloading when the surface is loaded to the maximum load of 400N, and acquiring the changes of the load and the loading depth; and performing a gridding lattice experiment on the surface of the rock debris sample to obtain a plurality of groups of indentation experiment load-displacement curve graphs.
6. The shale elasticity modulus evaluation method based on the rock debris micro-nano indentation experiment according to claim 1, wherein the specific process of the step S30 is as follows: directly obtaining the maximum indentation load P from the indentation experiment load-displacement curve chartmMaximum penetration depth hm(ii) a Then, the loading work W is calculated according to the following formulatUnloading work We；
In the formula: wtIs the loading work; weTo unload work; h ismMaximum press-in depth; p is the loading force at any depth in the loading process; dh is the loading depth step value; h isfTo unload the maximum residual depth.
7. The shale elasticity modulus evaluation method based on the rock debris micro-nano indentation experiment as claimed in claim 1, wherein the rock debris micro-nano indentation experiment is carried out on the rock debris sample in the step S20 to obtain a plurality of groups of indentation experiment load-displacement curves; in the step S40, the shale elastic modulus corresponding to each group of indentation experiment load-displacement curves is respectively calculated according to the shale elastic modulus prediction model under the micron indentation test condition.
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