Sleeve combination recommendation method based on passing verification

Abstract

The invention relates to the technical field of petroleum engineering, and discloses a casing combination recommendation method based on trafficability verification, and the method comprises the steps: constructing a virtual borehole, a general discriminant formula, an influence feature, a correction discriminant formula and a comprehensive analysis model, and operating the comprehensive analysis model to carry out whipstock recommendation or casing combination recommendation. According to the method, the geometric features of the real borehole are represented by constructing the virtual borehole, the universal discriminant formula is obtained to judge the trafficability of the casing combination, then the corrected discriminant formula is obtained by combining the features, influencing the geometric features of the virtual borehole, of the whipstock, the comprehensive analysis model is constructed based on the corrected discriminant formula, and finally whipstock recommendation or casing combination recommendation is achieved. A more scientific and accurate casing combination and whipstock selection scheme is provided for reuse of an old well groove, and the well hole utilization rate and quality are improved.

Description

Technical Field

[0001] This application relates to the field of petroleum engineering technology, specifically a casing assembly recommendation method based on passability verification. Background Technology

[0002] In the reuse of old well slots in oil operations, the proper selection of directional drilling rigs and the optimization of casing combinations are crucial. However, the inventors have discovered the following problems in existing methods for recommending directional drilling rigs or casing combinations:

[0003] 1. When judging the passability of casing assemblies, there is a lack of accurate and effective universal discrimination formulas, which makes it difficult to fully characterize the geometric characteristics of real wellbores, resulting in the inability to accurately assess the adaptability of casing assemblies in different wellbores.

[0004] 2. When using directional diverters to reuse old well slots, the impact on wellbore geometry is not fully considered, which may lead to mismatches between the recommended directional diverter and casing combination in actual applications, affecting wellbore utilization and safety.

[0005] 3. Existing recommended methods are often too simplistic and lack comprehensive analytical models. They cannot simultaneously consider multiple factors related to the combination of directional drilling rigs and casing, and therefore cannot provide the optimal solution for reusing old well slots.

[0006] In summary, there is an urgent need for a new technical solution based on passability verification for recommending casing combinations in order to improve the efficiency and quality of reusing old well slots. Summary of the Invention

[0007] The purpose of this application is to provide a method for recommending cannula combinations based on passability verification, so as to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, this application discloses the following technical solution: a method for recommending cannula combinations based on passability verification, comprising:

[0009] S1: Construct a virtual wellbore; wherein the virtual wellbore is used to characterize the geometric features of the real wellbore;

[0010] S2: Obtain the general discrimination formula; wherein, the general discrimination formula is used to determine the passability of the sleeve assembly;

[0011] S3: Obtain the influencing features; wherein, the influencing features are the features that affect the geometric features of the virtual wellbore when using the directional diverter to reuse the old well slot;

[0012] S4: Obtain the modified discrimination formula; wherein, the modified discrimination formula is used to determine the passability of the sleeve assembly when using the directional device, and the modified discrimination formula is obtained by modifying the general discrimination formula using the influence features;

[0013] S5: Obtain the comprehensive analysis model; wherein, the comprehensive analysis model is used for the recommendation of the directional device or the casing combination, and the comprehensive analysis model is constructed based on the modified discriminant formula;

[0014] S6: Run the comprehensive analysis model to recommend directional guides or casing combinations.

[0015] Preferably, the virtual wellbore is specifically:

[0016] Establish a Cartesian coordinate system with the vertex of the slant as the origin O;

[0017] Construct concentric circles with radii R1 and R2 in space, with center point O. t The coordinates are (x, y);

[0018] Within the new riser, considering only point C and below, circles R1 and R2, along with the side-drilled window, constitute a virtual wellbore through which the casing assembly passes. Circle R1 is tangent to the well wall and the directional device; circle R2 is concentric with circle R1 and passes through a fixed point A on the directional window; point M is the tangent point between circle R1 and the directional device, with a distance of n from the x-axis; and point C is the tangent point between circle R1 and the vertical well wall.

[0019] Preferably, the formulas for calculating the radii R1 and R2 corresponding to the circles R1 and R2 are as follows:

[0020] Set the lower window opening point B, and the distance from B to the bottom edge of the inclined plane is L. B ;

[0021]

[0022] Where R1 is the radius of the circle passing through point B and tangent to the vertical well wall and the inclined plane of the directional device, and its unit is m; R2 is the radius of the circle passing through point A and concentric with R1, and its unit is m; θ 斜 θ is the tilt angle of the cycloidal device, expressed in rad. 窗 The opening angle is in rad, D is the wellbore diameter in m, and L is the opening angle. 窗 L is the window diameter in meters (m). B The distance from the bottom edge of the inclined plane to the lower window point B is in meters.

[0023] Preferably, the general discrimination formula is as follows:

[0024] d 套max <min(L窗 ·sinθ 窗 d 套1 )

[0025] Where, d 套max The maximum value of the casing assembly diameter is in meters (m), and min is the minimum value. L 窗 θ is the window diameter in meters. 窗 The opening angle is expressed in rad, d 套1 The calculated diameter of the sleeve assembly is given in meters (m).

[0026] Preferably, the diameter d of the sleeve assembly 套1 The calculation formula is as follows:

[0027]

[0028] Where q is the uniformly distributed load of the lateral force in N / m, L is the casing length in m, R is the radius of curvature of the wellbore in m = 0.5*(R1+R2), D is the wellbore diameter in m, EI is the drill string stiffness in kg / m³, and K... n K m K q The parameters are preset, and m0 is the bending moment in N·m.

[0029] Preferably, the influencing feature is as follows:

[0030] When using the slant, the calculation formulas for the radii R1 and R2 corresponding to circles R1 and R2 are updated, and the result of this update is:

[0031]

[0032] The updated results are used to revise the general discriminant formula.

[0033] Preferably, the process of obtaining the modified discriminant formula includes:

[0034] Permissible casing combination diameter d 套max The maximum value is less than the smaller of the window diameter of the side-drilled window and the inner diameter of the slant, that is:

[0035] d 套max <min(L 窗 ·sinθ 窗 d 斜 )

[0036] Where, d 斜 The inner diameter of the azimuth compass is in meters (m).

[0037] Preferably, the process of obtaining the modified discriminant formula further includes:

[0038] The modified discriminant formula is obtained by modifying the general discriminant formula using the aforementioned influence features. The modified discriminant formula is as follows:

[0039] d 套max =d 接箍 <min(L 窗 ·sinθ 窗 d 斜 d 套1 )

[0040] Where, d 接箍 The diameter of the coupling of the casing assembly through the wellbore, in meters.

[0041] As a preferred option, the process recommended by the comprehensive analysis model for the inclinometer is as follows:

[0042] Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

[0043] Preferably, the process of recommending casing combinations using the comprehensive analysis model is as follows:

[0044] Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

[0045] Beneficial effects: The casing assembly recommendation method based on passability verification proposed in this application utilizes the construction of a virtual wellbore to characterize the geometric features of the real wellbore, obtains a general discrimination formula to judge the passability of the casing assembly, and then combines the features of the influence of the directional diverter on the geometric features of the virtual wellbore to obtain a modified discrimination formula. Based on this, a comprehensive analysis model is constructed, and finally, directional diverter recommendation or casing assembly recommendation is realized, providing a more scientific and accurate casing assembly and directional diverter selection scheme for the reuse of old well slots, and improving wellbore utilization and quality. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A flowchart illustrating the cannula combination recommendation method based on passability verification provided in this application embodiment;

[0048] Figure 2A schematic diagram of the geometric relationship of the sleeve assembly process provided in the embodiments of this application;

[0049] Figure 3 The contact relationship between the inner sleeve and the new riser under extreme conditions provided in this application embodiment;

[0050] Figure 4 Reference diagram for the cannula passage algorithm provided in the embodiments of this application;

[0051] Figure 5 This is a schematic diagram of the stress relationship of the casing under wellbore constraints provided in an embodiment of this application;

[0052] Figure 6 This is a schematic diagram of the structure of the slant provided in the embodiments of this application;

[0053] Figure 7 A photograph of the actual inclinometer provided in the embodiments of this application;

[0054] Figure 8 A schematic diagram showing the relationship between the inclined plane, mud surface, water-proof pipe, inner sleeve, and window position provided in the embodiments of this application. Detailed Implementation

[0055] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] This embodiment discloses, as follows: Figure 1 The method for recommending cannula combinations based on passability verification, as shown, includes:

[0058] S1: Construct a virtual wellbore; whereby the virtual wellbore is used to represent the geometric features of the real wellbore;

[0059] S2: Obtain the general discrimination formula; whereby the general discrimination formula is used to determine the passability of the casing assembly;

[0060] S3: Obtain the influencing features; where the influencing features are the characteristics that affect the geometric features of the virtual wellbore when using the directional diverter to reuse the old well slot;

[0061] S4: Obtain the modified discrimination formula; wherein, the modified discrimination formula is used to determine the passability of the sleeve assembly when using the directional device, and the modified discrimination formula is obtained by modifying the general discrimination formula using the influence features;

[0062] S5: Obtain the comprehensive analysis model; the comprehensive analysis model is used for the recommendation of the directional device or the casing combination, and the comprehensive analysis model is constructed based on the modified discriminant formula;

[0063] S6: Run the comprehensive analysis model to recommend directional devices or casing combinations.

[0064] Based on the above, this embodiment utilizes the construction of a virtual wellbore to characterize the geometric features of the real wellbore, obtains a general discrimination formula to determine the passability of the casing combination, and then combines the features that affect the geometric features of the virtual wellbore using the directional drilling tool to obtain a modified discrimination formula. Based on this, a comprehensive analysis model is constructed, and finally, directional drilling tool recommendations or casing combination recommendations are realized. This provides a more scientific and accurate casing combination and directional drilling tool selection scheme for the reuse of old well slots, thereby improving wellbore utilization and quality.

[0065] In a specific application, such as Figure 2 As shown, after the old riser is cut and the new riser is installed, the inner casing will enter the formation through the directional window below the mudline, guided by the inclined plane created by the directional device. In extreme cases, the outer wall of the inner casing will come into contact with the inner wall of the new riser, forming... Figure 3 The relationship shown, Figure 3 Point C is the contact point between the inner sleeve and the new riser, and point M is the contact point between the inner sleeve and the directional actuator. Points A and B are the upper and lower vertices of the directional window, respectively. Based on geometric relationships, it can be assumed that the sleeve column passing through the region is a three-dimensional beam-column with a constant cross-sectional area, and that the inner sleeve, the new riser, and the directional actuator are always in contact during the lowering process.

[0066] Specifically, the virtual wellbore is as follows:

[0067] Establish a Cartesian coordinate system with the vertex of the slant as the origin O;

[0068] Construct concentric circles with radii R1 and R2 in space, with center point O. t The coordinates are (x, y);

[0069] Within the new riser, considering only point C and below, circles R1 and R2, along with the side-drilled window, constitute a virtual wellbore through which the casing assembly passes. Circle R1 is tangent to the well wall and the directional device; circle R2 is concentric with circle R1 and passes through a fixed point A on the directional window; point M is the tangent point between circle R1 and the directional device, with a distance of n from the x-axis; and point C is the tangent point between circle R1 and the vertical well wall.

[0070] Based on the above, this embodiment establishes a Cartesian coordinate system with the vertex of the directional drilling rig as the origin, constructs concentric circles, and determines the composition of the virtual wellbore, thereby achieving accurate simulation of the geometric characteristics of the real wellbore and providing a basis for subsequent directional drilling rig or casing combination recommendations.

[0071] Specifically, the formulas for calculating the radii R1 and R2 corresponding to circles R1 and R2 are as follows:

[0072] Set the lower window opening point B, and the distance from B to the bottom edge of the inclined plane is L. B ;

[0073]

[0074] Where R1 is the radius of the circle passing through point B and tangent to the vertical well wall and the inclined plane of the directional device, and its unit is m; R2 is the radius of the circle passing through point A and concentric with R1, and its unit is m; θ 斜 θ is the tilt angle of the cycloidal device, expressed in rad. 窗 The opening angle is in rad, D is the wellbore diameter in m, and L is the opening angle. 窗 L is the window diameter in meters (m). B The distance from the bottom edge of the inclined plane to the lower window point B is in meters.

[0075] Based on the above, this embodiment utilizes a general discrimination formula to make a preliminary judgment on the passability of the sleeve assembly by means of the relationship between the maximum diameter of the sleeve assembly and parameters such as the opening diameter.

[0076] Specifically, the diameter d of the sleeve assembly 套1 The calculation formula is as follows:

[0077]

[0078] Where q is the uniformly distributed load of the lateral force in N / m, L is the casing length in m, R is the radius of curvature of the wellbore in m = 0.5*(R1+R2), D is the wellbore diameter in m, EI is the drill string stiffness in kg / m³, and K... n K m K q The parameters are preset, and m0 is the bending moment in N·m.

[0079] Based on the above, this embodiment calculates the diameter of the casing assembly by using parameters such as the uniformly distributed load of the lateral force, thus providing a basis for judging the passability.

[0080] In a specific application, the positions and symbols of other points are as follows: Figure 4 As shown, based on geometric relationships, points M, C, and O... t The coordinates are: M(ntanθ) 斜 ,-n), C(0,y), O t (x,y);

[0081] Therefore, the coordinates of each point in circle R1 should satisfy the following relationship:

[0082]

[0083] If the distance from the bottom edge of the inclined plane to the lower window point B is LB, then the coordinates of the upper and lower window points A and B can be derived as follows:

[0084] Substituting the coordinates of point B into the equation of circle R1, we get:

[0085]

[0086] At this point, there are three unknowns: x, y, and n. There are two sets of equations that can be used, therefore one boundary condition is lacking. Considering O... t The line connecting M should be perpendicular to the inclined plane of the inclinometer, and neither of the two lines should be horizontal. Therefore, the product of their slopes equals -1, which can be extended as follows:

[0087]

[0088] The expressions for x and y are as follows:

[0089]

[0090] At this point, only n is unknown, and once n is solved, the coordinates of all the points mentioned above can be directly deduced. Therefore, substitute equation (4-136) into the second equation in (4-135), and let... sinθ=B, tanθ=C, then this equation can be expanded using a simplification method to obtain:

[0091]

[0092] After simplification, we get:

[0093]

[0094] Solving for (4-139):

[0095]

[0096] In the formula: sinθ = B, tanθ = C.

[0097] At this point, x, y, and n are all known terms and can be directly used for subsequent calculations. Therefore, the coordinates of the current point and the established relationships are reorganized and listed below:

[0098] R1 = x

[0099] At this point, the radius of circle R2 can be calculated by referring to the known relationship:

[0100]

[0101] All quantities in equation (4-140) can be considered known, so the radius of circle R2 can also be calculated accordingly. At this point, the centers and radii of concentric circles R1 and R2 are determined, and the virtual wellbore has been established.

[0102] Due to the constraint of the wellbore, the installed casing assembly is subjected to a lateral force N. S The riser is subjected to the action of an axial force P (which is the riser's own weight when it re-enters the water supply), and may be subjected to bending moments M at both ends. A M B Its function, therefore, can be regarded as such Figure 5 The following is an example of a simply supported beam subjected to longitudinal and transverse bending loads:

[0103] At this point, the top of the casing string is subjected to the axial pressure P at the wellhead, and the lower end of the through section is subjected to the axial reaction force f of the directional wellbore. 顶 and contact friction f max In the limiting case, f 顶 Zero, axial direction depends only on P and f max They are mutually balanced. Therefore, the following relationship holds:

[0104] f max =μF N =μF B (4-141)

[0105] When P = f max +f 顶 When the casing is in a critical state where it can pass through, then:

[0106] K f =1-(r m / r s (4-142)

[0107] q=W sinαK f (4-143)

[0108]

[0109] In the formula, K f r is the buoyancy coefficient, dimensionless. m The density of the drilling fluid is expressed in kg / m³. 3 ;r s The density of the casing steel is given in kg / m³. 3 ; q is the distributed force, N / m; W is the weight per unit length of casing, kg / m; α is the well inclination angle, rad; K f M is the buoyancy coefficient, dimensionless; A M is the bending moment at end A, in N·m; B Let B be the bending moment at end B, in N·m; L be the length of the sleeve, in m.

[0110] For the sake of neat handwriting, we assume the following equations are true:

[0111] u = KL / 2, K m =(secu-1) / u 2 K n =3(tgu-u) / u 3 K q =24[secu-1-(u 2 / 2)] / 5u 4

[0112] In the formula, P is the axial force (the self-weight of the riser when it re-enters), N; EI is the sleeve stiffness, kg / m3; L is the sleeve length, m.

[0113] Then, combining the equation relationships established in the preceding sections, we can obtain:

[0114] N s =qL (4-146)

[0115] Then, substituting the expansions of q and L, we get:

[0116]

[0117] Where: N S q is the lateral force, N / m; q is the uniformly distributed load of the lateral force, N / m; L is the casing length, m; R is the wellbore radius of curvature, R = 0.5(R1 + R2), m; d_casing1 is the casing diameter, m; D is the wellbore diameter, m; M A M is the bending moment at point A, in N·m; B The bending moment at point B is N·m; EI is the drill string stiffness, kg / m³; K n K m K qThese are parameters obtained by those skilled in the art based on experience.

[0118] Furthermore, the permissible diameter d of the sleeve assembly. 套max It should be smaller than the window diameter of the side-drilling window; otherwise, the upward force f on the lower end face of the casing string will be insufficient. 顶 The disordered rise will lead to column buckling, hence:

[0119] d 套max <L 窗 ·sinθ 窗 (4-149)

[0120] Therefore, by combining equations (4-148) and (4-149), we obtain:

[0121] d 套max <min(L 窗 ·sinθ 窗 d 套1 (4-150).

[0122] Based on the above, this embodiment calculates the radii of circles R1 and R2 to accurately determine the virtual wellbore parameters, providing data support for judging the passability of the casing assembly.

[0123] Specifically, the general discriminant formula is as follows:

[0124] d 套max <min(L 窗 ·sinθ 窗 d 套1 )

[0125] Where, d 套max The maximum value of the casing assembly diameter is in meters (m), and min is the minimum value. L 窗 θ is the window diameter in meters. 窗 The opening angle is expressed in rad, d 套1 The calculated diameter of the sleeve assembly is given in meters (m).

[0126] Specifically, the influencing characteristics are as follows:

[0127] When using the slant, the formulas for calculating the radii R1 and R2 corresponding to circles R1 and R2 are updated, and the result of this update is:

[0128]

[0129] The results of this update are used to revise the general discriminant formula.

[0130] In a specific application, the structure of the slant used is as follows: Figure 6 As shown, the actual object is as follows Figure 7As shown, during use, the angled device, mud surface, water-tight pipe, inner sleeve, and window opening positions are as follows: Figure 8 As shown in the diagram, in this application scenario, point A can be considered to be flush with the top vertex of the directional drilling rig. The casing passing through the virtual wellbore will be constrained simultaneously by points C, M, A, and the lower wall of the side-drilling window. Moreover, in engineering practice, the bottom vertex of the side-drilling window usually coincides with point B. In this case, L... B =0, the ordinate of point A is zero, the coordinates of points A and B change as follows: A(D,0),

[0131] At this point, the contact relationship between the casing and the directional drilling rig will change. The casing will no longer be tangent to the directional drilling rig at point M and will not pass through point B. Therefore, the virtual wellbore equation in the previous section should be reconstructed, and the geometric parameters at each point should be: A(D,0). C(0,y), O t (x, y), M(ntanθ) 斜 (-n), R1 = x;

[0132] Assuming the upper casing is concentric with the riser during installation, the initial contact point between the casing assembly and the riser should be the midpoint of the directional drilling rig's inclined plane. Under the constraint of the directional drilling rig, the casing gradually bends and deforms to enter the side window. In the extreme case, the deformed casing will gradually detach from the directional drilling rig's guide inclined plane and move to point B to enter the side window. At this point, only points C and B constitute the virtual wellbore circle R1, while only point A constitutes circle R2. Therefore, the following relationship holds:

[0133]

[0134] Solving for:

[0135]

[0136] Furthermore, the permissible diameter d of the sleeve assembly. 套max It should be smaller than the window diameter of the side-drilled window and the inner diameter d of the beveling device. 斜 The smaller of the values, otherwise the upward force f on the lower end face of the casing string. 顶 Uncontrolled elevation can lead to tubular buckling:

[0137] d 套max <min(L 窗 ·sinθ 窗 d 斜 (4-153)

[0138] Furthermore, when the casing assembly through the wellbore has a coupling and a diameter of d... 接箍 Therefore, the diameter of the coupling is the largest diameter in the sleeve assembly. Thus, after considering all factors, the modified passability judgment rule can be obtained as shown in equation (4-154):

[0139] d 套max =d 接箍 <min(L 窗 ·sinθ 窗 d 斜 d 套1 (4-154).

[0140] Based on the above, this embodiment utilizes the influence of the updated calculation results of the radii of circles R1 and R2 when the inclinometer is used to prepare for the correction of the general discrimination formula.

[0141] Specifically, the process of obtaining the modified discriminant formula includes:

[0142] Permissible casing combination diameter d 套max The maximum value is less than the smaller of the window diameter of the side-drilled window and the inner diameter of the slant, that is:

[0143] d 套max <min(L 窗 ·sinθ 窗 d 斜 )

[0144] Where, d 斜 The inner diameter of the azimuth compass is in meters (m).

[0145] Based on the above, this embodiment further constrains the passability of the casing assembly by comparing the maximum allowable diameter of the casing assembly with the diameter of the side-drilling window and the inner diameter of the directional drilling tool.

[0146] Specifically, the process of obtaining the modified discriminant formula also includes:

[0147] After modifying the general discriminant formula using influence features, a modified discriminant formula is obtained:

[0148] d 套max =d 接箍 <min(L 窗 ·sinθ 窗 d 斜 d 套1 )

[0149] Where, d 接箍 The diameter of the coupling of the casing assembly through the wellbore, in meters.

[0150] As mentioned earlier, after solving for the absolute value n of the ordinate of point M, the coordinates of each point can be given based on the influence characteristics as follows: A(D,0). M(ntanθ 斜 ,-n),C(0,y);

[0151] At this time, it can be ordered Calculate the chord length L of BC using equations (4-139) and (4-140) respectively. BC 、∠CO t The value of B:

[0152]

[0153] Draw a perpendicular line from the center Ot to BC. The distance h from Ot to the foot of the perpendicular can be calculated using equation (4-141):

[0154]

[0155] Since the casing assembly can be considered to pass through the line BC before bending, and after bending under the action of downward pressure, it is tangent to the inclined device at point M, the bending deflection ω of the casing assembly can be calculated with reference to formula (4-158):

[0156]

[0157] After establishing the relationships from equations (4-155) to (4-158), the critical pressure P at which the casing is compressed to the point of instability of the compression rod can be given by referring to the geometric relationship of the casing passage process under wellbore constraints. cr and the critical stability deflection ω of the compression bar cr The calculation methods are shown in equations (4-159) and (4-160) respectively:

[0158]

[0159] When the axial force on the casing exceeds the critical pressure, the tool will exhibit highly unstable deflection. Assuming the casing bending reaches its limit, the tool's bending deflection ω at this point... jx The calculation method is as follows:

[0160]

[0161] At this point, to ensure safe installation, the tool's bending deflection must not exceed its limit. When the installed casing reaches its bending limit, it will be subjected to the combined effects of wellbore support reaction force and friction, hindering further installation. To ensure continued installation, the axial force at any cross-section of the casing must be greater than the frictional force, i.e.:

[0162] f = μ(F) A +F B +N s (4-162)

[0163] Pf≥0 (4-163)

[0164] Therefore, when recommending casing combination parameters in the future, reasonable recommendations should be made based on the constraints established in this section.

[0165] Based on the above, this embodiment uses the influence features to modify the general discrimination formula to obtain a modified discrimination formula, and uses parameters such as coupling diameter to achieve a more accurate judgment on the passability of the sleeve assembly.

[0166] Specifically, the process of recommending the inclinometer using the comprehensive analysis model is as follows:

[0167] Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

[0168] As a preferred embodiment of this example, when it is necessary to recommend available directional parameters, the self-weight P of the tubing and the diameter d of the inserted casing are considered. 套 Side-drilling window diameter L 窗 ·sinθ 窗 All parameters are known. At this point, the following condition must be met:

[0169] 1. Under the corresponding parameters, the casing can pass through the side drilling window normally;

[0170] 2. Under the corresponding parameters, the sleeve can pass normally through the inner hole of the directional tool;

[0171] 3. Under the corresponding parameters, the bending deflection of the sleeve shall not exceed the limit bending deflection.

[0172] Therefore, the following equations hold true:

[0173]

[0174] d 套 ≤min(L 窗 ·sinθ 窗 d 斜 d 套1 (4-166)

[0175] Assume the minimum usable diameter of the inclinometer's inner bore is d. 斜min The maximum inclination angle of the inclined plane of the swashplate is θ. 斜max Based on the characteristics of the inclined plane, the larger the inner hole and the smaller the inclination angle, the easier it is for the casing to pass through. Therefore, under the above parameters, the bending deflection value of the casing should be exactly equal to the ultimate bending deflection, i.e., the following formula holds:

[0176]

[0177] d 套 ≤d 斜min ≤min(L 窗 ·sinθ 窗 d 套1 (4-168)

[0178] d 斜 ≥d 斜min (4-169)

[0179] θ 斜 ≤θ 斜max (4-170)

[0180] Therefore, when recommending a swashplate, it should be ensured that the inner diameter of the swashplate and the inclination angle of the swashplate satisfy equations (4-169) and (4-170).

[0181] Based on the above, this embodiment recommends usable directional guide parameters based on known parameters, and achieves reasonable recommendations for directional guides through a comprehensive analysis model, thereby meeting the needs of reusing old well slots.

[0182] Specifically, the process of recommending casing combinations using the comprehensive analysis model is as follows:

[0183] Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

[0184] Based on the above, this embodiment also recommends available directional parameters based on known parameters, and through a comprehensive analysis model, achieves reasonable recommendations for casing combinations, thereby improving the reuse efficiency of old well slots.

[0185] In summary, the casing assembly recommendation method based on passability verification in this embodiment utilizes the construction of a virtual wellbore to characterize the geometric features of the real wellbore, obtains a general discrimination formula to judge the passability of the casing assembly, and then combines the features of the influence of the directional diverter on the geometric features of the virtual wellbore to obtain a modified discrimination formula. Based on this, a comprehensive analysis model is constructed, and finally, directional diverter recommendation or casing assembly recommendation is realized. This provides a more scientific and accurate casing assembly and directional diverter selection scheme for the reuse of old well slots, thereby improving wellbore utilization and quality.

[0186] In the embodiments provided in this application, it should be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For hardware implementation, the processor may be implemented in one or more of the following: application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to implement the functions described herein, or combinations thereof. For software implementation, some or all of the processes of the embodiments may be performed by a computer program instructing the associated hardware. During implementation, the program may be stored in a computer-readable storage medium or transmitted as one or more instructions or code on a computer-readable storage medium. Computer-readable storage media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media may be any available medium accessible to a computer. Computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code having the form of instructions or data structures and accessible to a computer.

[0187] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for recommending cannula combinations based on passability verification, characterized in that, include: S1: Construct a virtual wellbore; wherein the virtual wellbore is used to characterize the geometric features of the real wellbore; S2: Obtain the general discrimination formula; wherein, the general discrimination formula is used to determine the passability of the sleeve assembly; S3: Obtain the influencing features; wherein, the influencing features are the features that affect the geometric features of the virtual wellbore when using the directional diverter to reuse the old well slot; S4: Obtain the modified discrimination formula; wherein, the modified discrimination formula is used to determine the passability of the sleeve assembly when using the directional device, and the modified discrimination formula is obtained by modifying the general discrimination formula using the influence features; S5: Obtain the comprehensive analysis model; wherein, the comprehensive analysis model is used for the recommendation of the directional device or the casing combination, and the comprehensive analysis model is constructed based on the modified discriminant formula; S6: Run the comprehensive analysis model to recommend directional guides or casing combinations.

2. The cannula combination recommendation method based on passability verification according to claim 1, characterized in that, The virtual wellbore is specifically: Establish a Cartesian coordinate system with the vertex of the slant as the origin O; Construct concentric circles with radii R1 and R2 in space, with center point O. t The coordinates are (x, y); Within the new riser, considering only point C and below, circles R1 and R2, along with the side-drilled window, constitute a virtual wellbore through which the casing assembly passes. Circle R1 is tangent to the well wall and the directional device; circle R2 is concentric with circle R1 and passes through a fixed point A on the directional window; point M is the tangent point between circle R1 and the directional device, with a distance of n from the x-axis; and point C is the tangent point between circle R1 and the vertical well wall.

3. The cannula combination recommendation method based on passability verification according to claim 2, characterized in that, The formulas for calculating the radii R1 and R2 corresponding to circles R1 and R2 are as follows: Set the lower window opening point B, and the distance from B to the bottom edge of the inclined plane is L. B ; Where R1 is the radius of the circle passing through point B and tangent to the vertical well wall and the inclined plane of the directional device, and its unit is m; R2 is the radius of the circle passing through point A and concentric with R1, and its unit is m; θ 斜 θ is the tilt angle of the cycloidal device, expressed in rad. 窗 The opening angle is in rad, D is the wellbore diameter in m, and L is the opening angle. 窗 L is the window diameter in meters (m). B The distance from the bottom edge of the inclined plane to the lower window point B is in meters.

4. The cannula combination recommendation method based on passability verification according to claim 1, characterized in that, The general discriminant formula is as follows: d 套max <min(L 窗 ·sinθ 窗 ,d 套1 ) Where, d 套max The maximum value of the casing assembly diameter is in meters (m), and min is the minimum value. L 窗 θ is the window diameter in meters. 窗 The opening angle is expressed in rad, d 套1 The calculated diameter of the sleeve assembly is given in meters (m).

5. The cannula combination recommendation method based on passability verification according to claim 4, characterized in that, The diameter d of the sleeve assembly 套1 The calculation formula is as follows: Where q is the uniformly distributed load of the lateral force in N / m, L is the casing length in m, R is the radius of curvature of the wellbore in m = 0.5*(R1+R2), D is the wellbore diameter in m, EI is the drill string stiffness in kg / m³, and K... n K m K q The parameters are preset, and m0 is the bending moment in N·m.

6. The cannula combination recommendation method based on passability verification according to claim 3, characterized in that, The influencing characteristics are specifically as follows: When using the slant, the calculation formulas for the radii R1 and R2 corresponding to circles R1 and R2 are updated, and the result of this update is: The updated results are used to revise the general discriminant formula.

7. The cannula combination recommendation method based on passability verification according to claim 5, characterized in that, The process of obtaining the modified discriminant formula includes: Permissible casing combination diameter d 套max The maximum value is less than the smaller of the window diameter of the side-drilled window and the inner diameter of the slant, that is: d 套max <min(L 窗 ·sinθ 窗 ,d 斜 ) Where, d 斜 The inner diameter of the azimuth compass is in meters (m).

8. The cannula combination recommendation method based on passability verification according to claim 7, characterized in that, The process of obtaining the modified discriminant formula also includes: The modified discriminant formula is obtained by modifying the general discriminant formula using the aforementioned influence features. The modified discriminant formula is as follows: d 套max =d 接箍 <min(L 窗 ·sinθ 窗 ,d 斜 ,d 套1 ) Where, d 接箍 The diameter of the coupling of the casing assembly through the wellbore, in meters.

9. The cannula combination recommendation method based on passability verification according to claim 1, characterized in that, The process of recommending the inclinometer using the comprehensive analysis model is as follows: Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

10. The cannula combination recommendation method based on passability verification according to claim 1, characterized in that, The process of recommending casing combinations using the comprehensive analysis model is as follows: Based on the known weight of the casing string, the diameter of the casing being run in, the diameter and angle of the side-drilled window, the recommended parameters for the directional drilling device are provided.

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