Horizontal well casing running optimization method, device and equipment and medium

Abstract

The invention belongs to the technical field of casing installation, and particularly discloses a horizontal well casing running optimization method, device and equipment and a medium. Comprising the following steps that casing installation data are obtained, and hook load, friction resistance and the minimum hanging load of spiral buckling in the drilling process are calculated; judging whether sleeve floating optimization is adopted or not; when sleeve floating optimization is adopted, the length of a horizontal section is obtained, the first length of a floating section pipe is generated, and the hook load, the friction resistance and the minimum hanging weight of spiral buckling corresponding to the first length are calculated; and the minimum floating section length is calculated according to the hook load, the friction resistance and the minimum hanging load of spiral buckling corresponding to the first length. And obtaining the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length. According to the method, the length of the floating section is optimized through the calculated hook load, friction resistance and spiral buckling, the length of the floating section meeting the hook load and the friction resistance at the same time is obtained, and the installation efficiency of the casing pipe is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of casing installation, and in particular relates to a method, device and medium for optimizing casing lowering in a horizontal well. Background Art

[0002] With the further development of oil and gas fields and the opening of production in the region, in order to increase production capacity and development efficiency, the deployment of large-displacement three-dimensional and long horizontal wells has increased year by year in recent years. Large-displacement three-dimensional horizontal wells are when the vertical depth is certain, and the projection of the wellhead and the horizontal section are not on the same straight line. This leads to large offset and friction resistance for this type of well type, and many difficulties in casing lowering for subsequent completion operations. Severe cases will cause large casing friction resistance and no net hanging weight, and the casing cannot be lowered into place, which will have a great impact on subsequent completion operations and the production capacity development and production of the production layer. At present, for the on-site construction of casing lowering operations for large-displacement three-dimensional horizontal wells, engineers often report well construction and inspect the wellbore conditions based on experience, which cannot solve the problem of increased friction resistance and lack a set of scientific and systematic ideas and solutions.

[0003] This method starts with the actual drilling trajectory of the wellbore, combines the casing data table and geological development requirements, uses a centralizer to ensure the quality of cementing, establishes a data model and uses software analysis and simulation. Starting from several aspects, the casing string design is optimized, and the effective stress analysis of the casing string during the casing lowering process is simulated according to the wellbore trajectory and casing data to avoid serious pipe string buckling. The analysis of hanging weight and friction resistance simulates the change of friction resistance when the casing is in place. A series of technical measures form a scientific, fast and safe underground casing operation method. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device and medium for optimizing the running of casing in a horizontal well, so as to solve the technical problem that the offset distance and friction resistance of the existing horizontal well casing increase with the length of the horizontal section, resulting in low casing operation efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for optimizing casing running in a horizontal well, comprising the following steps:

[0007] Obtain casing installation data, and calculate the hook load, friction resistance and minimum suspended weight for spiral buckling during drilling based on the casing installation data;

[0008] Determine whether to use casing floating optimization based on the hook load, friction and minimum hanging weight for spiral buckling during drilling;

[0009] When casing floating optimization is adopted, the length of the horizontal section is obtained, and the first length of the floating section pipe is generated according to the length of the horizontal section, and the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length are calculated;

[0010] The minimum floating section length is calculated according to the hook load, friction and the minimum hanging weight for spiral buckling corresponding to the first length;

[0011] The optimal floating section length is obtained according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length.

[0012] A further improvement of the present invention is that the casing installation data is data collected after the centralizer is installed.

[0013] A further improvement of the present invention is that the casing installation data includes casing line weight, pipe density, wellbore diameter, casing outer diameter, annulus mud weight, pipe mud weight, support force on the three-dimensional wellbore inclination plane, support force on the three-dimensional wellbore dogleg angle plane, and the angle between the three-dimensional wellbore inclination plane and the dogleg angle plane.

[0014] A further improvement of the present invention is that the step of determining whether to adopt casing floating optimization according to the hook load, friction and the minimum hanging weight for spiral buckling during the drilling process specifically includes:

[0015] When the hook load during drilling is less than the minimum suspended weight for spiral bending during drilling, casing floating optimization is adopted.

[0016] A further improvement of the present invention is that the step of calculating the minimum floating section length according to the hook load, friction and the minimum suspended weight for spiral buckling corresponding to the first length specifically includes:

[0017] If the hook load corresponding to the first length is less than or equal to the minimum hanging weight corresponding to the first length for helical buckling, the first length is increased until the casing does not buckle, thereby obtaining the minimum floating section length;

[0018] If the hook load corresponding to the first length is greater than the minimum suspended weight corresponding to the first length for spiral buckling, buckling will not occur during the casing lowering process, the first length is reduced, and the minimum floating section length is obtained.

[0019] A further improvement of the present invention is that the step of obtaining the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length specifically includes:

[0020] The difference between the minimum floating section length and the first length is used as the horizontal coordinate, and the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length are used as the vertical coordinates to generate a relationship curve. The intersection of the relationship curve is taken, and the horizontal coordinate of the intersection is the optimal floating length.

[0021] A further improvement of the present invention is that the installation of the centralizer specifically includes the following steps:

[0022] Calculate the extreme centering degree;

[0023] Preset the first centralizer spacing and calculate the pipe string centering corresponding to the first centralizer spacing;

[0024] According to the centering degree of the pipe string and the limit centering degree, the first centralizer spacing is adjusted to obtain the second centralizer spacing;

[0025] Buckling analysis is performed according to the spacing of the second centralizers, and the spacing and number of the centralizers are obtained based on the buckling analysis results.

[0026] In a second aspect, the present invention provides a horizontal well casing running optimization device, comprising:

[0027] The first calculation module is used to obtain casing installation data and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling during the drilling process according to the casing installation data;

[0028] The first judgment module is used to judge whether to adopt casing floating optimization according to the hook load, friction resistance and the minimum hanging weight for spiral buckling during the drilling process;

[0029] The second calculation module is used to obtain the length of the horizontal section when the casing floating optimization is adopted, and generate the first length of the floating section pipe according to the length of the horizontal section, and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length;

[0030] The third calculation module is used to calculate the minimum floating section length according to the hook load, friction resistance and the minimum hanging weight for spiral buckling corresponding to the first length;

[0031] Optimization module: used to obtain the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length.

[0032] In a third aspect, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for optimizing casing lowering in a horizontal well when executing the computer program.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which implements the above-mentioned method for optimizing casing lowering in a horizontal well when executed by a processor.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] 1. Generally, the longer the floating section is, the smaller the friction is, which is more conducive to the lowering of the casing. However, the longer the floating length is, the ground hook load increases first and then decreases. When the floating section length increases to a certain extent, the hook load is too small and the casing cannot be lowered. The present invention optimizes the floating section length by calculating the hook load, friction and spiral buckling, and obtains the floating section length that satisfies both the hook load and friction, effectively improving the casing installation efficiency;

[0036] 2. The present invention precalculates the number and spacing of the centralizers in advance, so as to better keep the casing centered in the horizontal section / inclined section of the wellbore, which is beneficial to improving the cementing quality;

[0037] 3. The centralizer trial calculation process of the present invention is more in line with the actual situation that a centralizer needs to be lowered when lowering casing in order to ensure the cementing quality is qualified on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] In the attached picture:

[0040] Figure 1 A flow chart of a method for optimizing casing running into a horizontal well according to the present invention;

[0041] Figure 2 The present invention is a structural block diagram of a horizontal well casing running optimization device. DETAILED DESCRIPTION

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0043] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0044] Example 1

[0045] A method for optimizing casing running into a horizontal well, such as Figure 1 As shown, the following steps are included:

[0046] S1. Obtain casing installation data, and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling during drilling according to the casing installation data;

[0047] Specifically, the casing installation data includes the casing line weight si , pipe density ρ s , borehole diameter D h , casing outer diameter D co , annular mud weight MW Annular And the weight of mud in the pipe MW Internal , Support force N on the 3D wellbore inclination plane pi , Support force on the plane of the dogleg angle of the three-dimensional wellbore N Ri , the angle JA between the three-dimensional wellbore inclination plane and the dogleg angle plane, etc.;

[0048] Specifically, the casing installation data is data collected after the centralizer is installed;

[0049] Specifically, installing the centralizer includes the following steps:

[0050] Obtain engineering data, design the trajectory based on the engineering data, and perform simulation calculations and analysis on the buckling condition based on the trajectory;

[0051] Specifically, the buckling analysis includes the following steps:

[0052] ① Calculate the sine and spiral buckling limits at various locations of the casing based on the well inclination angle Inc, the elastic modulus E of the tubing, the moment of inertia I of the casing cross section, the weight W of the tubing in the mud, the tolerance limit r between the wellbore and the tubing, etc.;

[0053] ⅰ) Sine buckling limit F s

[0054] Rigid rod model:

[0055] Θ c =sin -1 [(1.94 / 2) 2 ×r×(W / EI) 1 / 3 ]

[0056] Inc>Θ c hour:

[0057] F s =2[sin(Inc)EIW / r] 1 / 2

[0058] Inc<Θ c hour:

[0059] F s =1.94(EIW 2 ) 1 / 3

[0060] ii) Helical buckling limit

[0061] Helical buckling limit F under loadingH :

[0062] F H =2.828427F s

[0063] Helical buckling limit F during unloading H :

[0064] F H =1.414213F s

[0065] ②According to the well inclination angle Inc, the full angle change θ, the elastic modulus E of the pipe string, and the pipe string linear weight q si , drilling fluid density ρ m , steel density ρ s , casing cross-section inertia moment I, wellbore curvature K, annular clearance μ, lateral force per unit length f n Calculate the axial compressive stress T at each depth during casing running ei ;

[0066]

[0067]

[0068] f E =11.3EIK 3

[0069]

[0070] ③ Compare the magnitude of axial compressive stress with the sine and helical buckling limits:

[0071] ⅰ) T>F s When , the casing does not buckle;

[0072] ii) F H ≤T<F s When , the casing undergoes sinusoidal buckling;

[0073] iii) T ≤ F H The casing undergoes spiral buckling.

[0074] Calculate the number and spacing of centralizers based on buckling conditions and trajectory;

[0075] Specifically, calculating the number and spacing of centralizers according to the buckling condition and trajectory includes the following steps:

[0076] ①According to the wellbore diameter D h and casing outer diameter D co Calculate the extreme centering degree [e];

[0077] e max≤[e]=(D h -D co ) / 6

[0078] ② From bottom to top, try to determine the spacing L of a centralizer, and calculate the centering degree e of the section of the string based on the well inclination angle Inc, the elastic modulus E of the pipe string, the floating weight We of the unit length of casing in the drilling fluid, the moment of inertia of the casing cross section I, the average well inclination full angle change β, and the deflection coefficient K of the centralizer spring. max .

[0079] ⅰ) If e max ≥[e], then appropriately increase the spacing and calculate again until e max = [e], find the maximum spacing L;

[0080] ii) If e max =[e], then the spacing L is the minimum spacing of the centralizers to meet the limit centering degree.

[0081] iii) If e max <[e], then reduce the spacing L and recalculate until e max ≥[e].

[0082] The minimum spacing of the centralizers to meet the ultimate centering degree can be obtained through i, ii, and iii.

[0083]

[0084] B=8π 4 EI / L 3 +2π 2 T / L

[0085] ③ Calculate the axial force T of the pipe string corresponding to the spacing L of the centralizers when the centralizer placement requirements are met to determine whether buckling occurs.

[0086] ⅰ) T>F s No buckling occurs, and the spacing L can be used as the spacing for placing the centralizers;

[0087] ii) F H ≤T<F s When the casing buckles sinusoidally, shorten the centralizer spacing L and recalculate from ②;

[0088] iii) T ≤ F H If spiral buckling occurs, shorten the distance L between the stabilizers and recalculate from ②.

[0089]

[0090] ④Through continuous calculations according to ①②③, determine the spacing and number of stabilizers at different positions that can prevent the casing from buckling.

[0091] Specifically, hook W buoy The calculation formula is as follows:

[0092] W buoy =W air -W Fluid ;

[0093] W Fluid =MW Annula ×A External -MW Internal ×A Internal ;

[0094] Friction T f The calculation formula is as follows:

[0095]

[0096] Increased inclination section:

[0097] ω=JA;

[0098] Downslope section:

[0099] ω=π-JA;

[0100] Minimum suspended weight W for helical buckling to occur:

[0101]

[0102] S2. Determine whether to use casing floating optimization according to the hook load, friction and minimum hanging weight for spiral buckling during the drilling process;

[0103] Specifically, in S2, when the hook load during drilling is less than the minimum suspended weight W for spiral bending during drilling, the casing will bend during the lowering process, and the ground hook load may be zero when the casing reaches the bottom of the well, and the casing cannot be lowered smoothly. At this time, floating casing lowering technology is needed for optimization.

[0104] S3, when casing floating optimization is adopted, the horizontal section length is obtained, and the first length of the floating section pipe is generated according to the horizontal section length, and the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length are calculated;

[0105] Specifically, the formulas for calculating the hook load, friction resistance and minimum suspended weight for helical buckling corresponding to the first length are the same as those in S1.

[0106] S4, calculating the minimum floating section length according to the hook load, friction resistance and the minimum hanging weight for spiral buckling corresponding to the first length;

[0107] Specifically, in S4:

[0108] i) if the hook load corresponding to the first length is less than or equal to the minimum hanging weight corresponding to the first length for helical buckling, then the first length is increased until the casing does not buckle and the minimum floating section length is obtained;

[0109] ii) If the hook load corresponding to the first length is greater than the minimum hanging weight corresponding to the first length for helical buckling to occur, buckling will not occur during the casing lowering process, the first length is reduced, and the minimum floating section length is obtained.

[0110] S5. Obtain the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length, and the hook load corresponding to the minimum floating section length.

[0111] Specifically, in S5, the difference between the minimum floating section length and the first length is used as the abscissa, and the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length are used as the ordinates to generate a relationship curve, and the intersection of the relationship curve is taken, and the abscissa of the intersection is the optimal floating length;

[0112] The floating coupling is suitable for horizontal wells and extended reach wells. When the floating coupling is used to run the casing, a temporary barrier can be formed inside the casing, so that the upper casing string is filled with drilling fluid and the lower part is filled with air, thereby increasing the buoyancy of the upper casing string and making the lower casing string float during the casing running process. The blind plate (a patented special glass plate) inside the floating coupling is crushed by pressure, and the broken blind plate forms fine particles that can be circulated out of the wellbore with the drilling.

[0113] Working principle: Shear pins are provided between the inner and outer sleeves of the floating coupling. When the wellhead is pressurized, the shear pins between the outer sleeve and the body are cut off, and the outer sleeve moves downward. The copper ball falls into the groove of the outer sleeve, exposing the circulation hole, and the circulation is established. The lower rubber plug is placed on the outer sleeve, pushing the inner and outer sleeves downward together, sitting on the valve seat of the floating coupling below, and the pressure is continued to be increased, and the lower rubber plug is opened to establish the circulation. The cement slurry is injected. After the cement is injected, the upper rubber plug is placed to replace the slurry, and it moves downward to the lower rubber plug for collision and pressure.

[0114] How to use the floating collar:

[0115] 1. Carefully check the floating coupling and its accessories, check whether the appearance of the floating coupling is not bumped, whether the shear nails are complete; the rubber parts of the rubber plug are intact; whether the connecting threads of the matching special floating coupling and floating shoe match the casing.

[0116] 2. Lower the float shoe and float hoop in sequence and connect the casing. There is no need to grout the casing. Pay attention to controlling the lowering speed.

[0117] 3. Connect the floating coupling at the designed position and grout the casing. Grout 20 casings at a time. Pay attention to controlling the lowering speed of the casing, especially when it is close to the designed position, to prevent the floating coupling from opening prematurely.

[0118] 4. After the casing is in place, it is filled with mud, the wellhead is pressurized, the floating coupling is opened, and the circulation is established. After the circulation is normal, the lower rubber plug is put in, and all the accessories in the floating coupling are pushed to the bottom of the well. The pressure is continued to break the rupture piece of the lower rubber plug to establish the circulation.

[0119] 5. After the circulation is normal, cementing operation is carried out. After cementing, the rubber plug is put in, the plugging liquid is pumped in, and then the mud is replaced until the pressure is hit. The cementing operation is completed.

[0120] Note: When connecting the floating coupling to the casing, tighten it according to the torque of 6000N.m.

[0121] Precautions

[0122] 1. No grouting is required in the connecting sleeve before connecting to the floating coupling;

[0123] 2. Control the casing lowering speed to prevent the floating coupling from opening prematurely

[0124] Example 2

[0125] A horizontal well casing running optimization device, such as Figure 2 As shown, including:

[0126] The first calculation module is used to obtain casing installation data and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling during the drilling process according to the casing installation data;

[0127] Specifically, the casing installation data includes the casing line weight si , pipe density ρ s , borehole diameter D h , casing outer diameter D co , annular mud weight MW Annular And the weight of mud in the pipe MW Internal , Support force N on the 3D wellbore inclination plane pi , Support force on the plane of the dogleg angle of the three-dimensional wellbore N Ri , the angle JA between the three-dimensional wellbore inclination plane and the dogleg angle plane, etc.;

[0128] Specifically, the casing installation data is data collected after the centralizer is installed;

[0129] Specifically, installing the centralizer includes the following steps:

[0130] Obtain engineering data, design the trajectory based on the engineering data, and perform simulation calculations and analysis on the buckling condition based on the trajectory;

[0131] Specifically, the buckling analysis includes the following steps:

[0132] ① Calculate the sine and spiral buckling limits at various locations of the casing based on the well inclination angle Inc, the elastic modulus E of the tubing, the moment of inertia I of the casing cross section, the weight W of the tubing in the mud, the tolerance limit r between the wellbore and the tubing, etc.;

[0133] ⅰ) Sine buckling limit F s

[0134] Rigid rod model:

[0135] Θ c =sin -1 [(1.94 / 2) 2 ×r×(W / EI) 1 / 3 ]

[0136] Inc>Θ c hour:

[0137] F s =2[sin(Inc)EIW / r] 1 / 2

[0138] Inc<Θ c hour:

[0139] F s =1.94(EIW 2 ) 1 / 3

[0140] ii) Helical buckling limit

[0141] Helical buckling limit F under loading H :

[0142] F H =2.828427F s

[0143] Helical buckling limit F during unloading H :

[0144] F H =1.414213F s

[0145] ②According to the well inclination angle Inc, the full angle change θ, the elastic modulus E of the pipe string, and the pipe string linear weight q si , drilling fluid density ρ m , steel density ρ s , casing cross-section inertia moment I, wellbore curvature K, annular clearance μ, lateral force per unit length f n Calculate the axial compressive stress T at each depth during casing running ei ;

[0146]

[0147]

[0148] f E =11.3EIK 3

[0149]

[0150] ③ Compare the magnitude of axial compressive stress with the sine and helical buckling limits:

[0151] ⅰ) T>F s When , the casing does not buckle;

[0152] ii) F H ≤T<F s When , the casing undergoes sinusoidal buckling;

[0153] iii) T ≤ F H The casing undergoes spiral buckling.

[0154] Calculate the number and spacing of centralizers based on buckling conditions and trajectory;

[0155] Specifically, calculating the number and spacing of centralizers according to the buckling condition and trajectory includes the following steps:

[0156] ①According to the wellbore diameter D h and casing outer diameter D co Calculate the extreme centering degree [e];

[0157] e max ≤[e]=(D h -D co ) / 6

[0158] ② From bottom to top, try to determine the spacing L of a centralizer, and calculate the centering degree e of the section of the string based on the well inclination angle Inc, the elastic modulus E of the pipe string, the floating weight We of the unit length of casing in the drilling fluid, the moment of inertia of the casing cross section I, the average well inclination full angle change β, and the deflection coefficient K of the centralizer spring. max .

[0159] ⅰ) If e max ≥[e], then appropriately increase the spacing and calculate again until e max = [e], find the maximum spacing L;

[0160] ii) If e max =[e], then the spacing L is the minimum spacing of the centralizers to meet the limit centering degree.

[0161] iii) If e max <[e], then reduce the spacing L and recalculate until e max ≥[e].

[0162] The minimum spacing of the centralizers to meet the ultimate centering degree can be obtained through i, ii, and iii.

[0163]

[0164] B=8π 4 EI / L 3 +2π 2 T / L

[0165] ③ Calculate the axial force T of the pipe string corresponding to the spacing L of the centralizers when the centralizer placement requirements are met to determine whether buckling occurs.

[0166] i) T>F s No buckling occurs, and the spacing L can be used as the spacing for placing the centralizers;

[0167] ii) F H ≤T<F s When the casing buckles sinusoidally, shorten the centralizer spacing L and recalculate from ②;

[0168] iii) T ≤ F H If spiral buckling occurs, shorten the distance L between the stabilizers and recalculate from ②.

[0169]

[0170] ④Through continuous calculations according to ①②③, determine the spacing and number of stabilizers at different positions that can prevent the casing from buckling.

[0171] Specifically, hook W buoy The calculation formula is as follows:

[0172] W buoy =W air -W Fluid ;

[0173] W Fluid =MW Annula ×A External -MW Internal ×A Internal ;

[0174] Friction T f The calculation formula is as follows:

[0175]

[0176] Increased inclination section:

[0177] ω=JA;

[0178] Downslope section:

[0179] ω=π-JA;

[0180] Minimum suspended weight W for helical buckling to occur:

[0181]

[0182] The first judgment module is used to judge whether to adopt casing floating optimization according to the hook load, friction resistance and the minimum hanging weight for spiral buckling during the drilling process;

[0183] Specifically, in the first judgment module, when the hook load during the drilling process is less than the minimum suspended weight W for spiral bending during the drilling process, the casing will bend during the lowering process, and the ground hook load may be zero when the casing reaches the bottom of the well, and the casing cannot be lowered smoothly. At this time, floating casing lowering technology is required for optimization.

[0184] The second calculation module is used to obtain the length of the horizontal section when the casing floating optimization is adopted, and generate the first length of the floating section pipe according to the length of the horizontal section, and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length;

[0185] Specifically, the formula for calculating the hook load, friction resistance and minimum suspended weight for helical buckling corresponding to the first length is the same as that in the first calculation module.

[0186] The third calculation module is used to calculate the minimum floating section length according to the hook load, friction resistance and the minimum hanging weight for spiral buckling corresponding to the first length;

[0187] Specifically, in the third calculation module:

[0188] i) if the hook load corresponding to the first length is less than or equal to the minimum hanging weight corresponding to the first length for helical buckling, then the first length is increased until the casing does not buckle and the minimum floating section length is obtained;

[0189] ii) If the hook load corresponding to the first length is greater than the minimum hanging weight corresponding to the first length for helical buckling to occur, buckling will not occur during the casing lowering process, the first length is reduced, and the minimum floating section length is obtained.

[0190] Optimization module: used to obtain the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length.

[0191] Specifically, in the optimization module, the difference between the minimum floating section length and the first length is used as the horizontal coordinate, and the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length are used as the vertical coordinates to generate a relationship curve, and the intersection of the relationship curve is taken, and the horizontal coordinate of the intersection is the optimal floating length;

[0192] Example 3

[0193] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method for optimizing casing lowering in a horizontal well is implemented.

[0194] Example 4

[0195] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned method for optimizing casing lowering in a horizontal well is implemented.

[0196] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0197] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0198] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0199] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0200] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for optimizing casing running in horizontal wells. It is characterized in that The following steps are involved: Obtain casing installation data, and calculate the hook load, friction resistance and minimum suspended weight for spiral buckling during drilling based on the casing installation data; Determine whether to use casing floating optimization based on the hook load, friction and minimum hanging weight for spiral buckling during drilling; When casing floating optimization is adopted, the length of the horizontal section is obtained, and the first length of the floating section pipe is generated according to the length of the horizontal section, and the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length are calculated; The minimum floating section length is calculated according to the hook load, friction resistance and the minimum hanging weight for spiral buckling corresponding to the first length; The optimal floating section length is obtained according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length.

2. A horizontal well casing running optimization method according to claim 1, It is characterized in that The casing installation data is data collected after the centralizer is installed.

3. A horizontal well casing running optimization method according to claim 1, It is characterized in that The casing installation data includes casing line weight, pipe density, wellbore diameter, casing outer diameter, annulus mud weight, pipe mud weight, support force on the three-dimensional wellbore inclination plane, support force on the three-dimensional wellbore dogleg angle plane, and the angle between the three-dimensional wellbore inclination plane and the dogleg angle plane.

4. A horizontal well casing running optimization method according to claim 1, It is characterized in that The step of determining whether to adopt casing floating optimization according to the hook load, friction and minimum hanging weight for helical buckling during the drilling process specifically includes: When the hook load during drilling is less than the minimum suspended weight for spiral bending during drilling, casing floating optimization is adopted.

5. A horizontal well casing running optimization method according to claim 1, It is characterized in that The step of calculating the minimum floating section length according to the hook load, friction and the minimum suspended weight for spiral buckling corresponding to the first length specifically includes: If the hook load corresponding to the first length is less than or equal to the minimum hanging weight corresponding to the first length for helical buckling, the first length is increased until the casing does not buckle and the minimum floating section length is obtained; If the hook load corresponding to the first length is greater than the minimum suspended weight corresponding to the first length for spiral buckling, buckling will not occur during the casing lowering process, the first length is reduced, and the minimum floating section length is obtained.

6. A horizontal well casing running optimization method according to claim 1, It is characterized in that The step of obtaining the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length specifically includes: The difference between the minimum floating section length and the first length is used as the horizontal coordinate, and the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length are used as the vertical coordinates to generate a relationship curve. The intersection of the relationship curve is taken, and the horizontal coordinate of the intersection is the optimal floating length.

7. A horizontal well casing running optimization method according to claim 2, It is characterized in that The installation of the centralizer specifically includes the following steps: Calculate the extreme centering degree; Preset the first centralizer spacing and calculate the pipe string centering corresponding to the first centralizer spacing; According to the centering degree of the pipe string and the limit centering degree, the first centralizer spacing is adjusted to obtain the second centralizer spacing; Buckling analysis is performed according to the spacing of the second centralizers, and the spacing and number of the centralizers are obtained based on the buckling analysis results.

8. A horizontal well casing running optimization device, It is characterized in that include: The first calculation module is used to obtain casing installation data and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling during the drilling process according to the casing installation data; The first judgment module is used to judge whether to adopt casing floating optimization according to the hook load, friction resistance and the minimum hanging weight for spiral buckling during the drilling process; The second calculation module is used to obtain the length of the horizontal section when the casing floating optimization is adopted, and generate the first length of the floating section pipe according to the length of the horizontal section, and calculate the hook load, friction resistance and minimum hanging weight for spiral buckling corresponding to the first length; The third calculation module is used to calculate the minimum floating section length according to the hook load, friction resistance and the minimum hanging weight for spiral buckling corresponding to the first length; Optimization module: used to obtain the optimal floating section length according to the minimum floating section length, the friction resistance corresponding to the minimum floating section length and the hook load corresponding to the minimum floating section length.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, a method for optimizing casing running into a horizontal well as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program. It is characterized in that When the computer program is executed by a processor, a method for optimizing casing running into a horizontal well as described in any one of claims 1 to 7 is implemented.

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