Prediction method for failure conditions of weak bedding planes in anisotropic reservoirs

Abstract

The present invention belongs to the field of oil and gas development and discloses a method for predicting the failure conditions of weak planes in anisotropic reservoir bedding. The method comprises: determining the total stress component of the anisotropic reservoir circumferential well based on the anisotropic reservoir circumferential stress component caused by far-field stress and the anisotropic reservoir circumferential stress component caused by drilling, wherein the anisotropic reservoir circumferential stress component caused by drilling is determined by constructing constitutive equations, equilibrium equations, coordinated strain equations, strain-displacement relationships, and boundary conditions; determining the stress component around the perforation hole based on the effect of cementing on the radial stress transmission at the bottom hole and the total stress component around the anisotropic reservoir circumferential well; and determining the critical pressure for failure of the weak planes in the anisotropic reservoir bedding based on the Jaeger weak plane failure criterion and the stress component around the perforation hole. The present invention can provide theoretical support for the safety of oil and gas development operations in anisotropic reservoirs and effectively reduce the risk of wellbore instability.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and natural gas development, and in particular to a method for predicting the failure conditions of weak planes in anisotropic reservoir bedding. Background Art

[0002] my country has huge potential for shale gas resource development. Shale gas reservoirs are generally buried deep and present typical characteristics such as complex geological structure, high stress, developed natural fractures and rock anisotropy. Shale reservoirs have a large number of bedding weak planes, and the conventional wellbore stabilization method assuming isotropy is no longer applicable, thereby increasing the risk of wellbore instability during oil and gas extraction operations in anisotropic reservoirs such as shale reservoirs. Summary of the Invention

[0003] In response to the above-mentioned defects or shortcomings of the prior art, the present invention provides a method for predicting the failure conditions of weak bedding planes in anisotropic reservoirs, which can more accurately predict the failure conditions of weak bedding planes in anisotropic reservoirs during oil and gas production operations, so as to effectively reduce the risk of wellbore instability.

[0004] To achieve the above object, the present invention provides a method for predicting the failure conditions of weak planes in anisotropic reservoir bedding, comprising:

[0005] Determining a total stress component around the anisotropic reservoir well based on anisotropic reservoir wellbore stress components caused by remote field stress and anisotropic reservoir wellbore stress components caused by drilling, wherein the anisotropic reservoir wellbore stress components caused by drilling are determined by constructing a constitutive equation, an equilibrium equation, a coordinated strain equation, a strain-displacement relationship, and boundary conditions;

[0006] Determining stress components around the perforation holes based on the effect of cementing on radial stress transmission at the bottom of the well and the total stress components around the anisotropic reservoir;

[0007] The critical pressure for the failure of the bedding weak plane of the anisotropic reservoir is determined according to the Jaeger weak plane failure criterion and the stress components around the perforation holes.

[0008] Optionally, the anisotropic reservoir wellbore stress component caused by drilling is determined by constructing a constitutive equation, an equilibrium equation, a coordinated strain equation, a strain-displacement relationship and boundary conditions, including:

[0009] Determining the constitutive equation according to the generalized plane strain formula;

[0010] At any position in the wellbore, the flexibility tensor matrix of the anisotropic reservoir in the constitutive equation is rotated to the wellbore reference coordinate system;

[0011] constructing a stress function related to a component of anisotropic reservoir wellbore stress caused by the drilling;

[0012] Determining two coupled sixth-order differential equations according to the stress function, the constitutive equation, the equilibrium equation, and the coordinated strain equation;

[0013] The corresponding characteristic roots and correlation coefficients are obtained by solving the two coupled sixth-order differential equations to determine the exact solution of the wellbore stress component of the anisotropic reservoir caused by drilling.

[0014] Optionally, the exact solution of the drilling-induced anisotropic reservoir wellbore stress component is:

[0015]

[0016] Optionally, the total anisotropic reservoir wellbore stress component is obtained by adding the anisotropic reservoir wellbore stress component caused by the remote field stress and the anisotropic reservoir wellbore stress component caused by drilling.

[0017] Optionally, determining the stress component around the perforation hole according to the effect of cementing on the radial stress transmission at the bottom of the well and the total stress component around the anisotropic reservoir includes:

[0018] Determine radial stress, perforation angle, and perforation length acting on anisotropic reservoirs after cementing;

[0019] Ignoring the stress concentration effect of the perforation holes, the stress components around the perforation holes are determined according to the total stress components around the anisotropic reservoir, the radial stress acting on the anisotropic reservoir after cementing, the perforation angle, and the perforation length.

[0020] Optionally, the stress component around the perforation hole is:

[0021]

[0022] Optionally, determining the critical pressure for failure of the weak plane of bedding in the anisotropic reservoir according to the Jaeger weak plane failure criterion and the stress components around the perforation hole includes:

[0023] converting the stress components around the perforation hole into stress components in the form of principal stresses;

[0024] According to the Jaeger weak plane failure criterion, a mechanical model of weak plane sliding failure and a mechanical model of intact rock failure are established;

[0025] The critical pressure of weak plane sliding failure is determined according to the mechanical model of weak plane sliding failure and the stress components under the principal stress form, and the critical pressure of complete rock failure is determined according to the mechanical model of complete rock failure and the stress components under the principal stress form.

[0026] Optionally, the stress components in the principal stress form are:

[0027]

[0028] The conditions for establishing the mechanical model of weak plane sliding failure are:

[0029] The mechanical model of weak plane sliding failure is:

[0030] The conditions for establishing the mechanical model of complete rock failure are:

[0031] The mechanical model of intact rock failure is:

[0032] σ1=2c o tanδ o +σ3tan 2 δ o .

[0033] Optionally, the prediction method further includes determining the anisotropic reservoir wellbore stress component caused by the remote field stress before determining the anisotropic reservoir wellbore total stress component, and determining the anisotropic reservoir wellbore stress component caused by the remote field stress includes:

[0034] Get well logging data:

[0035] Establish the geodetic reference coordinate system, remote field stress reference coordinate system, borehole reference coordinate system and weak plane reference coordinate system;

[0036] The anisotropic reservoir wellbore stress component caused by the far-field stress is determined according to the conversion relationship between the well logging data and different reference coordinate systems.

[0037] Optionally, the prediction method further includes:

[0038] Determine bottomhole flowing pressure after cementing;

[0039] Determining whether the bottom hole flowing pressure is greater than the critical pressure for the failure of the weak plane of bedding in the anisotropic reservoir;

[0040] When it is determined that the bottom hole flowing pressure is not greater than the critical pressure for destruction of the weak plane of bedding in the anisotropic reservoir, determining that the weak plane of bedding in the anisotropic reservoir will not be destroyed;

[0041] When it is determined that the bottom hole flow pressure is greater than the critical pressure for destruction of the weak plane of bedding in the anisotropic reservoir, it is determined that the weak plane of bedding in the anisotropic reservoir will be destroyed.

[0042] When using the method of the present invention to predict the failure conditions of weak planes in anisotropic reservoirs, in order to accurately calculate the stress components around the perforations, unlike existing methods, the method of the present invention requires the construction of constitutive equations, equilibrium equations, coordinated strain equations, strain-displacement relationships, and boundary conditions to determine the drilling-induced circumferential stress components of the anisotropic reservoir. This improves the accuracy and rationality of the calculated results. The anisotropic circumferential stress components caused by far-field stress are then combined to determine the accurate total circumferential stress components of the anisotropic reservoir. The stress components around the perforations are then accurately determined based on this total circumferential stress component and the effect of cementing on radial stress transmission at the bottomhole. Finally, the critical pressure for the failure of the weak planes in the anisotropic reservoir is determined based on the Jaeger weak plane failure criterion and the stress components around the perforations, i.e., the accurate failure conditions of the weak planes in the anisotropic reservoir. This method provides theoretical support for the safety of oil and gas development operations in anisotropic reservoirs, effectively reducing the risk of wellbore instability.

[0043] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 This is a flow chart of a method for predicting the failure conditions of weak planes in anisotropic reservoir bedding in a specific embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a geodetic reference coordinate system, a wellbore coordinate system, and principal stress directions in a specific embodiment of the present invention;

[0047] Figure 3 is a schematic diagram of a coordinate system of an anisotropic reservoir in a specific embodiment of the present invention;

[0048] Figure 4 It is a schematic diagram of a wellbore cross section in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationships of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0053] like Figure 1 As shown, the present invention provides a method for predicting the failure conditions of weak planes in anisotropic reservoir bedding. Specifically, when using the method of the present invention to predict the failure conditions of weak planes in anisotropic reservoir bedding, in order to accurately calculate the stress components around the perforations, unlike the prior art, the method of the present invention requires the construction of constitutive equations, equilibrium equations, coordinated strain equations, strain-displacement relationships, and boundary conditions to determine the anisotropic reservoir circumferential stress components caused by drilling, thereby improving the accuracy and rationality of the calculated results. The anisotropic reservoir circumferential stress components caused by far-field stress are then combined to jointly determine the accurate total stress components around the anisotropic reservoir circumferential well. The accurate stress components around the perforations are then determined based on the total stress components around the anisotropic reservoir circumferential well and the effect of cementing on radial stress transmission at the bottom of the well. Finally, the critical pressure for failure of the weak planes in the anisotropic reservoir bedding is determined based on the Jaeger weak plane failure criterion and the stress components around the perforations, i.e., the accurate failure conditions of the weak planes in the anisotropic reservoir bedding.

[0054] The following is an optional implementation of the above prediction method, see steps S1 to S7 for details, and refer to Figures 2 to 4 .

[0055] First, the calculation parameters that can be obtained from the well logging data include:

[0056] Sounding depth, m; wellbore inclination β b ,°; azimuth angle α of the wellbore b ,°; inclination angle of weak plane β w ,°; azimuth angle α of the weak plane w ,°; Angle γ between the minimum horizontal principal stress and the north direction,°; Vertical stress (total stress) S v , MPa; horizontal maximum principal stress (total stress) S H, MPa; horizontal minimum principal stress (total stress) S h , MPa; pore pressure P p , MPa; cohesion of intact rock c o , MPa; friction angle of intact rock φ o ,°; cohesion of weak surface c w , MPa; internal friction angle of weak surface φ w ,°; tensile strength St, MPa; compressive strength UCS, MPa; transverse elastic modulus E h , GPa; vertical elastic modulus E v , GPa; transverse Poisson's ratio ν h ; Vertical Poisson's ratio ν v .

[0057] Steps S1 to S7 are specifically as follows:

[0058] S1. Establishing the geodetic reference coordinate system, far-field stress reference coordinate system, and wellbore reference coordinate system involved in the anisotropic wellbore stability model ( Figure 2 ) and the weak surface reference coordinate system ( Figure 3 ), that is, according to the defined coordinate systems and their relationships, determine the rotation matrix required to transform stress from one reference coordinate system to another, and realize the transformation of stress between various reference coordinate systems;

[0059] The rotation matrix required to transform the far-field stress reference coordinate system to the earth reference coordinate system is (Equation 1):

[0060]

[0061] The rotation matrix required to transform the geodetic reference coordinate system to the borehole reference coordinate system is (Equation 2):

[0062]

[0063] The rotation matrix required to transform the weak plane reference coordinate system to the wellbore reference coordinate system is (Equation 3):

[0064]

[0065] S2, through the rotation matrix in S1, the far-field stress obtained by logging is used to obtain the wellbore stress component caused by the far-field stress in the wellbore coordinate system (Equation 5), that is, the far-field three-dimensional effective stress (Equation 4) is equal to the three-dimensional total stress minus the pore pressure,

[0066]

[0067]

[0068] Where: his the minimum horizontal principal stress (effective stress), σ H is the maximum horizontal principal stress (effective stress), σ v is the vertical stress (effective stress); σ xx,o , σ yy,o , σ zz,o is the normal stress of the anisotropic formation wellbore stress component caused by far-field stress, unit: MPa; τ xy,o =τ yx,o , τ xz,o =τ zx,o , τ yz,o =τ zy,o is the shear stress of the anisotropic formation wellbore stress component caused by far-field stress, unit: MPa;

[0069] S3. Based on the anisotropic characteristics of shale reservoirs, constitutive equations, equilibrium equations, coordinated strain equations, strain-displacement relationships, and boundary conditions are established to obtain the drilling-induced anisotropic formation wellbore stress components. That is, based on the generalized plane strain formula (Equation 6), the elastic relationship between anisotropic stress and strain is determined (Equation 7). At any location in the wellbore, the compliance tensor matrix of the anisotropic medium is rotated to the wellbore reference coordinate system through the constitutive relationship and coordinate transformation (Equation 8).

[0070]

[0071] in:

[0072]

[0073] Where: xx,h , σ yy,h , σ zz,h is the normal stress of the anisotropic formation wellbore stress component caused by drilling, unit: MPa; τ xy,h =τ yx,h , τ xz,h =τ zx,h , τ yz,h =τ zy,h is the shear stress of the anisotropic formation wellbore stress component caused by drilling, unit: MPa; ε xx,h , ε yy,h , ε zz,h is the normal strain of the anisotropic formation wellbore stress component caused by drilling; yz,h , γ xz,h , γ xy,h is the shear strain of the anisotropic formation wellbore stress component caused by drilling;

[0074]

[0075]

[0076] in: G v is the vertical shear modulus, GPa; G h is the transverse shear modulus, GPa;

[0077]

[0078] l x = -cosα b cosβ b m x =-sinα b cosβ b n x =sinβ b

[0079] l y =sinα b m y = -cosα b n y =0

[0080] l z =cosα b sinβ b m z =sinα b sinβ b n z =cosβ b (11)

[0081]

[0082] l r = -cosα w cosβ w m r =-sinα w cosβ w n r =sinβ w

[0083] l s =sinα w m s = -cosα w n s =0

[0084] l t =cosα w sinβ w m t =sinαw sinβ w n t =cosβ w (13)

[0085] Define two stress functions F(x,y) and G(x,y) related to the anisotropic rock stress components. Their relationship with the stress components is as follows:

[0086]

[0087] Substituting the equilibrium equation (Equation 15), the constitutive equation (Equation 7) and the coordinated strain equation (Equation 16) into the equation, we obtain two coupled sixth-order differential equations (Equation 17):

[0088]

[0089]

[0090]

[0091] The differential operators L2, L3, and L4 are expressed as follows:

[0092]

[0093]

[0094]

[0095] in,

[0096] Substitute the stress function F(x,y) into Get the algebraic equation after differentiation

[0097] l2(μ)=β 44 -2β 45 μ+β 55 μ 2

[0098] l3(μ)=-β 24 +(β 25 +β 46 )μ-(β 14 +β 56 )μ 2 +β 15 μ 3

[0099] l4(μ)=β 22 -2β 26 μ+(2β 12 +β 66 )μ2 -2β 16 μ 3 +β 11 μ 4 (19)

[0100] μ can be calculated i (i=1,...,6), then the coefficients λ1,λ2,λ3 are as follows:

[0101]

[0102] Solving the differential equation (Equation 17) yields the corresponding characteristic roots and correlation coefficients (Equations 21-24), and obtaining the exact solution of the wellbore stress component under the action of the wellbore wall force (Equation 25).

[0103]

[0104]

[0105]

[0106]

[0107]

[0108]

[0109]

[0110] Among them, θ is the well circumference angle, and in the case of inclined wells and horizontal wells, it is the angle between the highest point on the well wall and a certain point in the clockwise direction;

[0111] S4, total effective stress component of anisotropic reservoir around the well (σ xx ,σ yy ,σ zz is the normal stress, unit is MPa; τ xy =τ yx , τ xz =τ zx , τ yz =τ zy is the shear stress, unit MPa) is obtained by adding the anisotropic formation wellbore stress component caused by the far-field stress obtained by S2 and the anisotropic formation wellbore stress component caused by drilling obtained by S3 (Equation 26);

[0112]

[0113] S5. Rotate the total stress component of the anisotropic reservoir from the rectangular coordinate system (NEV coordinate system) to the wellbore coordinate system, consider the effect of cementing on the radial stress transmission at the bottom of the well, and determine the effective stress component around the perforation hole by the perforation angle and perforation length, that is: Figure 4 , as shown in formula 27-28, TF is the transfer coefficient; p w is the bottom hole pressure, unit is MPa; p R is the radial stress acting on the rock after cementing, in MPa; E is the elastic modulus of cement, in GPa; ν is the Poisson's ratio of cement; E s is the elastic modulus of the casing, in GPa; ν s is the Poisson's ratio of the casing; the inner and outer radii of the casing are R i With R o , unit m; r w is the wellbore radius, l p is the perforation length, r=r w +l p , unit is m; based on the stress distribution model of the wellbore in any direction of the anisotropic reservoir, the stress components around the well in the rectangular coordinate system are converted into stress components in the cylindrical coordinate system (Equation 29),

[0114]

[0115]

[0116]

[0117] Since the wellbore radius is much larger than the perforation hole radius, the stress concentration effect of the perforation hole is ignored, and only the stress concentration effect of the wellbore is considered. Finally, the effective stress component of the perforation hole in the cylindrical coordinate system is determined by the perforation angle and perforation length ( is the radial stress, is the hoop stress, is the axial stress, unit: MPa; is the shear stress in cylindrical coordinates, unit: MPa; v v is the vertical Poisson's ratio);

[0118] S6. Based on the anisotropic failure behavior of highly layered shale in the reservoir, the Jaeger weak plane failure criterion is used to establish mechanical models of weak plane sliding failure and intact rock failure. The failure pressures of weak plane sliding and intact rock are calculated. That is, the stress values on the wellbore wall in the cylindrical coordinate system are converted into principal stress forms (Equations 30-31, where σ1, σ2, and σ3 are the maximum principal stress, intermediate principal stress, and minimum principal stress, respectively).

[0119]

[0120]

[0121] According to the sliding failure condition of the crack weak plane (Equation 32) and the mechanical model of sliding failure (Equation 33), the critical pressure p of the weak plane sliding failure is calculated. wb , unit: MPa.

[0122]

[0123]

[0124] According to the conditions of intact rock failure (when δ w ≤φ w or ) and the mechanical model (Eq. 34), calculate the critical pressure p for intact rock failure wf , unit MPa.

[0125]

[0126] S7. The critical pressure for the failure of the weak plane of the fracture is calculated by the parameters such as the ground stress, the physical mechanics of the rock and the wellbore trajectory obtained by the logging interpretation through steps S1-S6: the critical pressure for the failure of the sliding wb Or the critical pressure p at which intact rock fails wf , unit MPa; p w is the bottom hole pressure, unit is MPa; when p w >p wb or p w >p wf When p w ≤p wb And p w ≤p wf When the crack is weakened, no damage will occur on the weak side.

[0127] In summary, the method of the present invention comprehensively considers the effects of geostress, weak plane occurrence, arbitrary wellbore trajectory, and radial stress decay from bottomhole flow pressure after cementing. It establishes a stress model for arbitrarily oriented wellbores, accurately calculates the stress magnitude within perforations, and uses appropriate failure criteria to calculate the failure pressure of bedding weak planes, thereby predicting the failure conditions of bedding weak planes. This provides theoretical support for safe oil and gas development operations in anisotropic reservoirs such as shale reservoirs, effectively reducing the risk of wellbore instability.

[0128] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0129] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will no longer separately describe various possible combinations.

[0130] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A method for predicting the failure conditions of weak planes in anisotropic reservoir bedding, comprising: Determining a total stress component around the anisotropic reservoir well based on anisotropic reservoir wellbore stress components caused by remote field stress and anisotropic reservoir wellbore stress components caused by drilling, wherein the anisotropic reservoir wellbore stress components caused by drilling are determined by constructing a constitutive equation, an equilibrium equation, a coordinated strain equation, a strain-displacement relationship, and boundary conditions; Determining stress components around the perforation holes based on the effect of cementing on radial stress transmission at the bottom of the well and the total stress components around the anisotropic reservoir; The critical pressure for failure of the bedding weak plane of anisotropic reservoir is determined based on the Jaeger weak plane failure criterion and the stress components around the perforation holes, including: converting the stress components around the perforation hole into stress components in the form of principal stresses; According to the Jaeger weak plane failure criterion, a mechanical model of weak plane sliding failure and a mechanical model of intact rock failure are established; Determining the critical pressure of weak plane sliding failure based on the mechanical model of weak plane sliding failure and the stress components under the principal stress form, and determining the critical pressure of intact rock failure based on the mechanical model of intact rock failure and the stress components under the principal stress form; Among them, the stress components under the principal stress form are: The conditions for establishing the mechanical model of weak plane sliding failure are: The mechanical model of weak plane sliding failure is: The conditions for establishing the mechanical model of complete rock failure are: The mechanical model of intact rock failure is: σ1=2c o tanδ o +σ3tan 2 d o 。 2. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 1, wherein: The anisotropic reservoir wellbore stress components caused by drilling are determined by constructing constitutive equations, equilibrium equations, coordinated strain equations, strain-displacement relationships and boundary conditions, including: Determining the constitutive equation according to the generalized plane strain formula; At any position in the wellbore, the flexibility tensor matrix of the anisotropic reservoir in the constitutive equation is rotated to the wellbore reference coordinate system; constructing a stress function related to a component of anisotropic reservoir wellbore stress caused by the drilling; Determining two coupled sixth-order differential equations according to the stress function, the constitutive equation, the equilibrium equation, and the coordinated strain equation; The corresponding characteristic roots and correlation coefficients are obtained by solving the two coupled sixth-order differential equations to determine the exact solution of the wellbore stress component of the anisotropic reservoir caused by drilling.

3. The method for predicting the failure condition of anisotropic reservoir bedding weak plane according to claim 2, wherein: The exact solution of the drilling-induced anisotropic reservoir stress component is:

4. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 1, wherein: The total stress component of the anisotropic reservoir around the well is obtained by adding the stress component of the anisotropic reservoir around the well caused by the remote field stress and the stress component of the anisotropic reservoir around the well caused by drilling.

5. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 1, wherein: The stress components around the perforation holes are determined based on the effect of cementing on the radial stress transmission at the bottom of the well and the total stress components around the anisotropic reservoir, including: Determine radial stress, perforation angle, and perforation length acting on anisotropic reservoirs after cementing; Ignoring the stress concentration effect of the perforation holes, the stress components around the perforation holes are determined according to the total stress components around the anisotropic reservoir, the radial stress acting on the anisotropic reservoir after cementing, the perforation angle, and the perforation length.

6. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 5, wherein: The stress components around the perforation holes are:

7. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 1, wherein: The prediction method further includes determining the anisotropic reservoir wellbore stress component caused by the remote field stress before determining the anisotropic reservoir wellbore total stress component. Determining the anisotropic reservoir wellbore stress component caused by the remote field stress includes: Get well logging data: Establish the geodetic reference coordinate system, remote field stress reference coordinate system, borehole reference coordinate system and weak plane reference coordinate system; The anisotropic reservoir wellbore stress component caused by the far-field stress is determined according to the conversion relationship between the well logging data and different reference coordinate systems.

8. The method for predicting the failure conditions of weak planes of anisotropic reservoir bedding according to claim 1, wherein: The prediction method further comprises: Determine bottomhole flowing pressure after cementing; Determining whether the bottom hole flowing pressure is greater than the critical pressure for the failure of the weak plane of bedding in the anisotropic reservoir; When it is determined that the bottom hole flowing pressure is not greater than the critical pressure for destruction of the weak plane of bedding in the anisotropic reservoir, determining that the weak plane of bedding in the anisotropic reservoir will not be destroyed; When it is determined that the bottom hole flow pressure is greater than the critical pressure for destruction of the weak plane of bedding in the anisotropic reservoir, it is determined that the weak plane of bedding in the anisotropic reservoir will be destroyed.

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