CN114047082A - Method for testing shearing strength of non-uniform ground stress well cementation cement sheath and stratum interface - Google Patents
Method for testing shearing strength of non-uniform ground stress well cementation cement sheath and stratum interface Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 158
- 239000004568 cement Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010008 shearing Methods 0.000 title claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 82
- 239000003822 epoxy resin Substances 0.000 claims abstract description 41
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 41
- 239000011521 glass Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 235000014121 butter Nutrition 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 238000005755 formation reaction Methods 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000004575 stone Substances 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 230000004323 axial length Effects 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
-
- 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
- G01N2203/0025—Shearing
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
Abstract
The invention provides a method for testing the shearing strength of a non-uniform stress well cementation cement sheath-stratum interface, which comprises the following steps: (1) manufacturing a cement-rock core combined test piece; (2) placing the combined body test piece in a cubic mold, and pouring epoxy resin in the annular area to prepare a cubic test piece; (3) placing a pressure head at the top of a cylindrical cement sheath of a cubic test piece, placing the bottom of the cylindrical cement sheath on a hollow support base, and integrally placing the cylindrical cement sheath on a true triaxial rock pressure testing machine; starting the confining pressure loading system of the press to make unequal loads sigma in the horizontal direction2And σ3Respectively loaded to preset values, then a shaft pressure loading system is started, and the axial load sigma is slowly and uniformly loaded1Immediately stopping loading when the cement sheath and the rock are damaged to obtain a maximum load value FmaxAccording to cement and rockThe contact area of the stone, i.e. the lateral area of the cylindrical cement, calculates the cement-core bond shear strength. The invention has simple principle and simple and convenient operation.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploitation and storage engineering, and particularly relates to a method for testing shearing strength of a cement sheath-stratum interface of non-uniform stress well cementation.
Background
The well cementation cement sheath not only can hang and protect the casing, but also has the function of interlayer isolation. In the process of oil and natural gas exploitation and storage, the interlayer packing characteristic of the well cementation cement sheath becomes a key index for evaluating the sealing integrity of a shaft. The well bore penetrates through stratums with different lithological properties from the earth surface to reach a reservoir, fluid is injected and extracted from the casing, the casing is easy to shrink, and the cement sheath is subjected to plastic deformation, so that a cement sheath cementing interface forms a micro-sheath, gas leaks from the micro-sheath, and the interlayer packing effect of the cement sheath fails.
In the prior art, a method for testing the shearing strength of the interface of a non-uniformly stressed cement sheath-stratum is not considered, so that the requirement of testing the shearing strength of a cementing two-interface under the condition of non-uniformly stress formed by structural stress is met.
Disclosure of Invention
The invention aims to provide a method for testing the shearing strength of a cement sheath-stratum interface of non-uniform ground stress well cementation, which solves the technical problem that the shearing strength of the cement sheath-stratum interface of an oil-gas well is difficult to test under the non-uniform ground stress while fully utilizing the existing test instrument under the condition that a rock core test piece is difficult to obtain.
In order to achieve the purpose, the invention adopts the following technical scheme: the method for testing the shearing strength of the interface between the non-uniform stress well cementation cement sheath and the stratum comprises the following steps:
(1) preparing a cement-rock core combined test piece:
selecting rock, preparing a rock core test piece, drilling a through hole in the middle of the rock core test piece, vertically placing the rock core test piece with the through hole on a glass plate, coating high-temperature butter on the contact surface of the glass plate and the rock core, injecting prepared cement paste into the through hole of the rock core test piece, then putting the whole body into a curing kettle for curing for seven days, and completing the preparation of the cement-rock core combined test piece.
(2) Selecting epoxy resin:
preparing epoxy resin, pouring the epoxy resin into a cylindrical mold, preparing a cylindrical test piece, performing uniaxial compression and Brazilian splitting tests after the epoxy resin is solidified, measuring the elastic modulus, Poisson's ratio and tensile strength of the cylindrical test piece, and selecting the epoxy resin proportion with small difference with the mechanical parameters of the core test piece.
(3) Preparing a cubic test piece:
and (2) placing the cement-rock core combined piece into a cubic die, wherein the height of the cubic die is the same as that of the combined piece, injecting the epoxy resin selected in the step (2) between the cubic die and the combined piece, pouring in a segmented and layered manner, pouring for 5cm each time, pouring again after solidification, and separating the epoxy resin from the cubic die after the epoxy resin is solidified.
(4) Placing the prepared cubic test piece between a pressure head and a support base, integrally placing the cubic test piece on a true triaxial rock pressure tester, and slowly applying sigma2And σ3To a preset value, then applying an axial stress sigma to the cylindrical cement by means of a ram1Observing the axial force-displacement curve, stopping the test immediately when the interface of the cement and the rock core slides relatively or the cement and the rock core break, and recording the peak load value Fmax。
(5) The area of the contact surface between the cement and the rock core of the cement-rock core combined body test piece is the side area of the cylindrical cement, the diameter of the cylindrical cement is D, the length of the cylindrical cement is L, and the formula is defined by
And calculating the shear strength of the cement-rock core interface.
Further, the preparation of the cube test piece in the step (3) can prepare various epoxy resin poured cement-core composite test pieces with different sizes according to the core size drilled by the oil and gas well, and explore the shearing strength of the cementing two interfaces under different packing lengths of the cement sheath.
Further, σ is slowly applied in step (4)2And σ3To a predetermined value, σ2And σ3Representing two different horizontal ground stresses, and can simulate the cementing shear strength of a cementing interface under the nonuniform ground stress caused by the formation stress of rock formations with different depths.
The invention has the beneficial effects that:
(1) the method provided by the invention can be used for preparing standard cubic test pieces according to the rock core test pieces with different sizes in consideration of the actual rock core obtaining condition and the laboratory measurement condition, testing the bonding shear strength of the non-uniform ground stress cement-stratum interface under different scales, filling the blank of the existing equipment and technology, providing a theoretical basis for on-site evaluation of the interlayer packing capacity of the well cementation two-interface cement sheath and the damage condition of the cement sheath, and further evaluating the integrity failure risk of the well cementation two-interface cement sheath of the oil and gas well.
(2) The invention has simple principle and simple and convenient operation, can carry out interface shear strength test under non-uniform ground stress on cement-core combined body test pieces with different scales before and after a seepage test, is beneficial to simulating interlayer packing capacity of cement ring cementing two interfaces under real stress, better optimizes a cement slurry formula system, makes up the defects of the existing instrument and equipment, and has wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a core test piece structure of a manufacturing process of a cement-core combined test piece.
Fig. 2 is a schematic structural diagram of a core test piece with a through hole after the core test piece drills the through hole in the manufacturing process of the cement-core combined test piece.
Fig. 3 is a schematic structural diagram of a core test piece with a through hole injected with cement slurry in a manufacturing process of a cement-core combination test piece.
Fig. 4 is a schematic structural diagram of the preparation of a cubic test piece.
Fig. 5 is a schematic view of an indenter, a cubic specimen, and a support base with a hollow circular hole.
Reference numbers in the figures: 1, a rock core; 2-hollow round hole; 3-cement and core cementing interface; 4-cement slurry; 5-high temperature butter; 6-glass plate; 7-epoxy resin; 8-cubic mold; 9-a pressure head; 10-a supporting base with a hollow round hole.
Detailed Description
The invention provides a method for testing the shearing strength of a non-uniform ground stress cement sheath-stratum interface by placing a cubic test piece (a cement-rock core combined test piece poured with epoxy resin) on a true triaxial rock press, which mainly comprises the following steps: epoxy resin, a cement-rock core combination test piece, a pressure head and a support base with a hollow round hole. The cement-rock core combined test piece is prepared by pouring cement slurry in the center of a cylindrical test piece with a prefabricated through hole and curing the cement slurry; the epoxy resin is used for pouring a cement-rock core combination test piece and the annular space of the cubic die to prepare a cubic test piece; the pressure head is used for applying axial load to the upper cylindrical cement; the support base with the hollow round hole is used for fixing the cubic test piece in the shearing test process, so that the cylindrical cement can be pushed out.
The method for testing the shearing strength of the cement sheath-stratum interface of the non-uniform stress well cementation sequentially comprises the following steps of:
(1) preparing a cement-rock core combination cylindrical test piece:
selecting a rock with a larger size, preparing a cylindrical rock core test piece (the size of the cylindrical rock core can be designed to be phi 50 multiplied by 100mm, phi 50 multiplied by 200mm and phi 50 multiplied by 300mm) by utilizing a linear cutting or rock core drilling machine, punching a through hole in the center of the rock core test piece, and preparing the rock core test piece with the through hole; and placing the prepared core test piece on a glass plate, and coating high-temperature grease on the contact part of the core test piece and the glass plate to play a certain sealing role. Then pouring cement slurry in the center of the core test piece with the through hole to simulate well cementation; and after the core test piece and the glass plate which are injected with the cement paste are integrally maintained for seven days in an environment with certain temperature and pressure (the maintenance temperature and pressure are determined according to the actual underground working condition), taking out the cement-core combined test piece, polishing the end surface of the test piece, cutting the test piece smoothly, and simultaneously ensuring that the axial length of the cylindrical cement is equal to that of the cylindrical core.
(2) Preparing a cubic test piece (a cement-core combined test piece poured with epoxy resin):
preparing epoxy resin according to different proportions, pouring the epoxy resin into a cylindrical mold, preparing a standard cylindrical test piece (the size is phi 50 multiplied by 100mm), placing the standard cylindrical test piece prepared from the epoxy resin on a uniaxial rock press after the standard cylindrical test piece is solidified at room temperature, testing the basic mechanical properties such as elastic modulus, Poisson ratio, tensile strength and the like, and selecting the proportion of the epoxy resin which is similar to the mechanical properties of the rock core test piece; and (2) placing the cement-core combined test piece prepared in the step (1) in the middle of a cube mould (the size of the cube mould can be designed to be 100mm multiplied by 100mm, 200mm multiplied by 200mm and 300mm multiplied by 300mm), injecting epoxy resin into an annular area of the cement-core combined test piece and the cube mould to enable the height of the epoxy resin to be consistent with the axial height of the cement-core combined test piece, placing the cement-core combined test piece at room temperature to be in a solidification state, separating the epoxy resin from the cube mould, and completing preparation of the cube test piece.
(3) Placing the cubic test piece on a true triaxial rock press machine for a shear test, and obtaining the cement-core interface shear strength through data processing, wherein the process is as follows:
a. placing a pressure head on the top of the cylindrical cement of the cubic test piece, placing a support base with a hollow round hole on the bottom of the cubic test piece, and enabling the hollow round hole to be over against the bottom of the cylindrical cement;
b. placing the whole of the step a on a base of a true triaxial rock press, and slowly applying sigma to a cubic test piece (a cement-rock core combined test piece poured with epoxy resin) at a certain speed by the press2And σ3When the preset value is reached, the press slowly applies axial load sigma to the cubic test piece through the press head1And simultaneously recording the peak load F of debonding of the interface between the cylindrical cement and the rock core of the cubic test piece until the cylindrical cement and the rock core slide relatively or the cement or rock in the cubic test piece cracksmax；
The diameter of the cylindrical cement of the cement-core combined test piece is D, the height of the cylindrical cement is L, and the shear strength P of the cement-core interface is calculated according to the following formula:
the present invention will be described in detail below with reference to the accompanying drawings.
See the drawings. The invention provides a method for testing shearing strength of a non-uniform ground stress well cementation cement sheath-stratum interface, which mainly comprises the following steps:
the method comprises the following steps: a cylindrical rock core test piece 1 is prepared by utilizing a linear cutting or rock core drilling machine, a through hole 2 is punched in the center of the rock core test piece 1, and rock core test pieces with through holes of different sizes are prepared (figure 2). Step two: placing the prepared core test piece (figure 2) on a glass plate 6, coating high-temperature butter 5 on a place contacted with the glass plate, pouring cement paste 4 in the center of the core test piece (figure 2), wherein the cement paste 4 and the core test piece 1 form a contact surface 3, then placing the core test piece (figure 3) in an environment with certain temperature and pressure (determined according to the formation temperature and the ground stress of the actual embedded depth of a shaft) for curing for seven days, and completing the preparation of the cement-core combined test piece.
Step three: and taking out the cement-core combined test piece from the maintenance kettle, polishing the end face of the cement-core combined test piece, cutting the test piece smoothly, and simultaneously ensuring that the axial length of the cylindrical cement is equal to that of the cylindrical core.
Step four: the central cylindrical cement 4 was measured to have a diameter D and a height L, i.e. the lateral area a of the cylindrical cement ═ pi DL.
Step five: preparing epoxy resin 7 according to the weight ratio of the AB glue to the glue B of 3:1, placing a cement-rock core combined test piece into a cubic die 8, pouring the epoxy resin 7 in a layered manner in an annular area of the cement-rock core combined test piece and the cubic die until the axial length of the epoxy resin is the same as that of the cylindrical cement and the cylindrical rock core, stopping pouring, and after the epoxy resin is solidified, finishing the preparation of the cubic test piece.
Step six: the cubic test piece is taken out of the cubic mold 8 and placed between the indenter 9 and the support base 10 with the hollow circular hole.
Step seven: a cubic test piece, a pressure head 9 and a supporting base 10 with hollow round holes are integrally placed on a base of the true triaxial rock press, and sigma is slowly applied to the cubic test piece at the speed of 0.02Mpa/s by the press2And σ3After the preset value is reached, slowly applying an axial load sigma to the cubic test piece through the pressure head 91And simultaneously recording the peak load F of debonding of the interface between the cylindrical cement and the rock core of the cubic test piece until the cylindrical cement 4 and the rock core 1 slide relatively or the cement 4 and the rock core 1 in the cubic test piece crackmax。
Step eight: calculating the bond shear strength P acting on the bonding interface 3 of the cubic test piece cement and the rock, namely
Examples
A method for testing the shearing strength of a cement sheath-stratum interface of non-uniform stress well cementation, taking the core size phi 50 multiplied by 100mm as an example, comprises the following steps:
the method comprises the following steps: a cylindrical rock core test piece 1 is prepared by utilizing a linear cutting or rock core drilling machine, a through hole 2 is punched in the center of the rock core test piece 1, and a rock core test piece with the outer diameter of 50mm, the inner diameter of 18mm and the height of 100mm is prepared (figure 2).
Step two: placing the prepared core test piece (figure 2) on a glass plate 6, coating high-temperature butter 5 at the position contacted with the glass plate, pouring cement paste 4 in the center of the hollow rock test piece, wherein the cement paste 4 and the core test piece 1 form a contact surface 3, then placing the core test piece (figure 3) into a curing kettle with the temperature of 25 ℃ and the pressure of 8MPa for curing for seven days, and completing the preparation of the cement-core combined test piece. Step three: and taking out the cement-core combined test piece from the maintenance kettle, polishing the end face of the cement-core combined test piece, cutting the test piece smoothly, and simultaneously ensuring that the axial length of the cylindrical cement is equal to that of the cylindrical core.
Step four: the central cylindrical cement 4 was measured to have a diameter of 18mm and a height of 100mm, i.e. the lateral area a of the cylindrical cement pi x 18 x 100 i 5654.87mm2＝56.5487cm2。
Step five: preparing epoxy resin 7 according to the weight ratio of the AB glue to the glue of 3:1, placing a cement-core combination test piece into a cubic mold 8 with the thickness of 100mm multiplied by 100mm, pouring the epoxy resin 7 in a layered mode in the annular area of the cement-core combination test piece and the cubic mold until the axial length of the epoxy resin is the same as that of the cylindrical cement and the cylindrical core, stopping pouring, waiting for the epoxy resin to solidify, and completing the preparation of the cubic test piece.
Step six: the cubic test piece is taken out of the cubic mold 8 and placed between the indenter 9 and the support base 10 with the hollow circular hole.
Step seven: a cubic test piece, a pressure head 9 and a supporting base 10 with hollow round holes are integrally placed on a base of the true triaxial rock press, and a pressure machine is used for simultaneously applying sigma to the cubic test piece at the speed of 0.02Mpa/s2And σ3When the pressure respectively reaches 6MPa and 8MPa, slowly applying axial load to a cement-rock core combined body test piece poured with epoxy resin at the speed of 0.5mm/min through a pressure head 9 until the cylindrical cement 4 and the rock core (figure 2) slide relatively or the cement 4 and the rock core (figure 2) in the cubic test piece crack, and simultaneously recording the peak load F of debonding of the interface between the cylindrical cement and the rock core of the cubic test piecemaxAnd 9.56 kN.
Step eight: calculating the bond shear strength P acting on the cement-rock bond interface 3 in a cubic test piece, i.e.
Finally, it is noted that the above embodiments illustrate rather than limit the invention, and that while the invention has been described with reference to the embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The method for testing the shearing strength of the interface between the non-uniform ground stress well cementation cement sheath and the stratum is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing a cement-rock core combined test piece:
selecting rock, preparing a rock core test piece, drilling a through hole in the middle of the rock core test piece, vertically placing the rock core test piece with the through hole on a glass plate, coating high-temperature butter on the contact surface of the glass plate and the rock core, injecting prepared cement paste into the through hole of the rock core test piece, then putting the whole body into a curing kettle for curing for seven days, and completing the preparation of the cement-rock core combined test piece;
(2) selecting epoxy resin:
preparing epoxy resin, pouring the epoxy resin into a cylindrical mold, preparing a cylindrical test piece, performing uniaxial compression and Brazilian splitting tests after the epoxy resin is solidified, measuring the elastic modulus, Poisson's ratio and tensile strength of the cylindrical test piece, and selecting the proportion of the epoxy resin with small difference with the mechanical parameters of the core test piece;
(3) preparing a cubic test piece:
placing a cement-rock core combined test piece into a cubic mold, wherein the height of the cubic mold is the same as that of the combined test piece, injecting the epoxy resin selected in the step (2) between the cubic mold and the combined test piece, pouring in a segmented and layered mode, pouring for 5cm each time, pouring again after solidification, and separating the epoxy resin from the cubic mold until the pouring is finished and the epoxy resin is solidified;
(4) placing the prepared cubic test piece between a pressure head and a support base, integrally placing the cubic test piece on a true triaxial rock pressure tester, and slowly applying sigma2And σ3To a preset value, then applying an axial stress sigma to the cylindrical cement by means of a ram1Observing the axial force-displacement curve, stopping the test immediately when the interface of the cement and the rock core slides relatively or the cement and the rock core break, and recording the peak load value Fmax；
(5) The area of the contact surface between the cement and the rock core of the cement-rock core combined body test piece is the side area of the cylindrical cement, the diameter of the cylindrical cement is D, the length of the cylindrical cement is L, and the formula is defined by
And calculating the shear strength of the cement-rock core interface.
2. The method for testing the shear strength of the interface between the non-uniformly stressed well-cementing cement sheath and the stratum according to claim 1, wherein: and (3) preparing the cube test piece in the step (3), preparing various epoxy resin poured cement-core assembly test pieces with different sizes according to the core size drilled by the oil and gas well, and exploring the shearing strength of the two well cementation interfaces of the cement sheath under different packing lengths.
3. The method for testing the shear strength of the interface between the non-uniformly stressed well-cementing cement sheath and the stratum according to claim 1, wherein: slowly applying sigma in step (4)2And σ3To a predetermined value, σ2And σ3Representing two different horizontal ground stresses, and can simulate the cementing shear strength of a cementing interface under the nonuniform ground stress caused by the formation stress of rock formations with different depths.
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