Deepwater drilling guide pipe installation depth design method based on mechanical relation between operation parameters

Abstract

The invention discloses a deepwater drilling guide pipe installation depth design method based on a mechanical relationship among operation parameters, which comprises the following steps of: performing preliminary design of deepwater drilling guide pipe installation by utilizing soil parameters of an adjacent well to obtain the bearing capacity and the mud entering depth of the deepwater drilling guide pipe; the deepwater drilling guide pipe is installed through the obtained deepwater drilling guide pipe bearing capacity and the obtained deepwater drilling guide pipe mud entering depth, the deepwater drilling guide pipe real-time bearing capacity is solved through the mechanical relation during deepwater drilling guide pipe installation operation, and therefore the deepwater drilling guide pipe installation depth is corrected in real time till deepwater drilling guide pipe installation is completed; when the deepwater drilling guide pipe is installed, the shearing strength of each area in the installation and descending process of the deepwater drilling guide pipe is obtained through operation parameter analysis, and a basis is provided for follow-up guide pipe depth theoretical design of an adjacent well. The accuracy of the designed depth of the drilling guide pipe can be guaranteed, and a large amount of seabed soil sampling cost can be saved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oil and gas engineering, and particularly to a method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters. Background Art

[0002] The deepwater drilling conductor is a key load-bearing structure for deepwater oil and gas wells, mainly used to support the blowout preventer and the subsea Christmas tree, and to bear the weight of each casing string. It is subjected to multiple coupling effects of the drilling platform and the pipe string for a long time. Scientifically and reasonably determining the conductor installation depth is a prerequisite for ensuring safe and efficient deepwater drilling operations: if the installation is too deep, the efficiency is low and it is easy to cause the conductor to not reach the designated position due to uncontrollable factors of the seabed soil quality; if the installation is too shallow, the bearing capacity is insufficient, it is difficult to support the upper load, and it is easy to cause instability or sinking accidents.

[0003] The existing methods for designing the installation depth of deepwater drilling conductors usually rely on the pile-soil interaction model, and determine the installation depth by calculating the bearing capacity of the conductor at different depths. However, this method depends on the seabed soil quality parameters of deepwater, and the cost of drilling and sampling for obtaining soil quality parameters is extremely high (the cost of a single drilling and sampling test can reach several million yuan). Therefore, it is often difficult to obtain accurate soil data through frequent sampling in actual design, and the soil quality parameters of adjacent wells are usually used for substitution analysis. Since there may be significant differences in the soil quality conditions between adjacent wells and the target well, there will be a greater risk in the design of the conductor installation depth. Historically, there have been many cases of conductor sinking accidents caused by unreasonable design, resulting in huge economic losses and even drilling failures.

[0004] Therefore, there is an urgent need for a method for designing the installation depth of a deepwater drilling conductor based on operation parameters. Summary of the Invention

[0005] The present invention provides a method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters, which improves the design accuracy, reduces the operation risk, and reduces costs and increases efficiency for deepwater drilling operations.

[0006] The first aspect of the present invention provides a method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters, including the following steps:

[0007] Perform a preliminary design of the deepwater drilling conductor installation using the soil quality parameters of adjacent wells to obtain the bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud;

[0008] Use the obtained bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud to perform the deepwater drilling conductor installation. Solve the real-time bearing capacity of the deepwater drilling conductor through the mechanical relationship between operation parameters during the deepwater drilling conductor installation operation, so as to real-time correct the installation depth of the deepwater drilling conductor until the deepwater drilling conductor installation is completed;

[0009] During the installation of the deepwater drilling conductor, the shear strength of the soil after disturbance during the installation of the deepwater drilling conductor is analyzed based on the pile-soil interaction theory according to the operation parameters, providing a basis for the theoretical design of the conductor depth of adjacent wells in the future.

[0010] For the method for designing the installation depth of a deepwater drilling conductor based on operation parameters, preferably, the bearing capacity of the deepwater drilling conductor is calculated by the following formula:

[0011]

[0012] f u = αs u (2)

[0013] Where:

[0014] F u is the bearing capacity of the deepwater drilling conductor;

[0015] D is the outer diameter of the conductor;

[0016] f u is the friction force per unit contact area between the pipe and the soil;

[0017] α is the adhesion coefficient, and in deep water experiments, α is 0.9 - 0.95;

[0018] s u represents the undrained shear strength of the formation drilled through.

[0019] For the method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters, preferably, the penetration depth of the deepwater drilling conductor into the mud is calculated by the following formula:

[0020] F u ≥W (3)

[0021]

[0022] Where:

[0023] W is the wellhead load;

[0024] H min is the penetration depth of the drilling conductor into the mud;

[0025] is the average friction force per unit contact area between the pipe and the soil in the shallow soil layer.

[0026] For the method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters, preferably, the real-time bearing capacity of the deepwater drilling conductor is calculated by the following formula:

[0027] T + W f+W b = G1 + G2 + G3 (5)

[0028] W f (l) = G1 + G2 + G3 - W b (l) - T(l) (6)

[0029]

[0030] K t = 0.04ln(t) + 0.03 (10)

[0032] wherein:

[0033] W b is the bottom hole weight;

[0034] W f is the side friction of the deep - water drilling conductor;

[0035] G2 is the self - weight of the deep - water drilling conductor;

[0036] G1 is the self - weight of the jet drill string assembly;

[0037] G3 is the self - weight of the wellhead and the sinking plate;

[0038] T is the pulling force of the pipe string;

[0039] W f (l) is the side friction of the deep - water drilling conductor at different depths;

[0040] K t is the bearing capacity recovery coefficient at time t;

[0041] K0 is the initial bearing capacity recovery coefficient when t = 0;

[0042] F ut is the real - time bearing capacity during the installation of the drilling conductor;

[0043] l is the installation depth;

[0044] W b (l) is the bit weight at the installation depth;

[0045] T(l) is the pulling force of the pipe string at the installation depth;

[0046] f(l) is the unit side friction at the installation depth.

[0047] For the design method of the installation depth of the deep - water drilling conductor based on the mechanical relationship between operation parameters, preferably, the shear strength after soil disturbance during the installation of the deep - water drilling conductor is calculated by the following formula:

[0048]

[0049] Wherein:

[0050] S u (l) is the shear strength after soil disturbance during the installation process.

[0051] The second aspect of the present invention provides a deepwater drilling conductor installation depth design system based on the mechanical relationship between operation parameters, including:

[0052] The first processing unit uses the soil parameters of adjacent wells to perform a preliminary design of the deepwater drilling conductor installation, and obtains the bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud;

[0053] The second processing unit uses the obtained bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud to perform the deepwater drilling conductor installation. By solving the mechanical relationship between the operation parameters during the deepwater drilling conductor installation operation, the real-time bearing capacity of the deepwater drilling conductor is obtained, so as to correct the installation depth of the deepwater drilling conductor in real time until the installation of the deepwater drilling conductor is completed;

[0054] The third processing unit, during the installation of the deepwater drilling conductor, uses the pile-soil interaction theory to analyze the shear strength after soil disturbance during the installation process of the deepwater drilling conductor according to the operation parameters, providing a basis for the theoretical design of the conductor depth of subsequent adjacent wells.

[0055] The second aspect of the present invention provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the deepwater drilling conductor installation depth design method based on the mechanical relationship between operation parameters are realized.

[0056] The third aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the deepwater drilling conductor installation depth design method based on the mechanical relationship between operation parameters are realized.

[0057] The beneficial effects are:

[0058] The present invention does not rely on seabed soil parameters and does not require costly sampling and testing. Instead, by analyzing the mechanical relationships between various parameters during the operation process, the bearing capacity of the conductor is solved in real time, and the installation depth of the conductor is designed and dynamically corrected based on this. The method of the present invention can achieve the theoretical design before the conductor installation, the real-time correction during the conductor installation, and the operation summary after the installation. Compared with the traditional method, the method of the present invention not only significantly improves the accuracy of the installation depth design of the deepwater drilling conductor, greatly improves the precision, can save a large amount of seabed soil sampling costs, reduces the on-site conductor installation operation risk, and provides a safer and more efficient technical guarantee for deepwater drilling. Brief Description of the Drawings

[0059] Figure 1 It is a schematic diagram of the method of the present invention;

[0060] Figure 2 It is a schematic diagram of the mechanical analysis during the installation of the deepwater drilling conductor. Detailed Embodiment

[0061] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0062] A method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters provided by the present invention includes the following steps: using the soil parameters of adjacent wells for the preliminary design of the deepwater drilling conductor installation to obtain the bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud; using the obtained bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor into the mud to carry out the installation of the deepwater drilling conductor, and solving the real-time bearing capacity of the deepwater drilling conductor through the mechanical relationship during the deepwater drilling conductor installation operation, so as to real-time correct the installation depth of the deepwater drilling conductor until the deepwater drilling conductor installation is completed; during the installation of the deepwater drilling conductor, obtaining the shear strength of each area during the descent process of the deepwater drilling installation through operation parameter analysis, providing a basis for the theoretical design of the conductor depth of adjacent wells in the future. The present invention does not rely on seabed soil parameters and does not require costly sampling and testing. Instead, by analyzing the mechanical relationships between various parameters during the operation process, the bearing capacity of the conductor is solved in real time, and the installation depth of the conductor is designed and dynamically corrected based on this. The present invention can not only ensure the accuracy of the designed depth of the drilling conductor, but also save a large amount of seabed soil sampling costs.

[0063] The following takes a method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operation parameters as an example to elaborate on the entire technical process in detail.

[0064] Example 1

[0065] The reasonable design principle for the depth of deep - water drilling conductors is that the real - time bearing capacity of the deep - water drilling conductor meets the dangerous working - condition loads during operation. Taking the South China Sea as an example.

[0066] As Figure 1 shown, a design method for the installation depth of deep - water drilling conductors based on the mechanical relationship between operation parameters includes the following steps:

[0067] S1: Use the soil parameters of adjacent wells for the preliminary design of the installation of deep - water drilling conductors to obtain the bearing capacity of the deep - water drilling conductor and the penetration depth of the deep - water drilling conductor into the mud.

[0068] Among them: The bearing capacity of the deep - water drilling conductor is obtained through formula (1) and formula (2):

[0069] First, refer to the soil parameters of adjacent wells to obtain the initial design value before the installation of the conductor. According to the pile - soil interaction theory, the calculation method for the theoretical bearing capacity of the deep - water drilling conductor is formula (1). Because in the deep water of the South China Sea, affected by the sedimentary environment, the shallow soil is generally clay or silty clay. The frictional force per unit area of the drilling conductor in the clay layer can be regarded as a function of the undrained shear strength of the soil. The calculation method for the frictional force per unit area of the contact surface in formula (1) is shown in formula (2):

[0070]

[0071] f u =αs u (2)

[0072] Among them:

[0073] F u is the bearing capacity of the deep - water drilling conductor, N;

[0074] D is the outer diameter of the conductor, m;

[0075] f u is the frictional force per unit contact area between the pipe and the soil, Pa;

[0076] α is the adhesion coefficient, and in deep water, α is 0.9 - 0.95 according to experiments;

[0077] s u represents the undrained shear strength of the drilled formation, Pa.

[0078] S12: The penetration depth of the deep - water drilling conductor into the mud is calculated through formula (3) and formula (4):

[0079] F u ≥W (3)

[0080]

[0081] Wherein:

[0082] W is the wellhead load;

[0083] H min is the penetration depth of the drilling conductor into the mud;

[0084] is the average unit contact area friction between the conductor and the soil in the shallow layer, in Pa.

[0085] S2: Using the obtained bearing capacity of the deepwater drilling conductor and the penetration depth of the deepwater drilling conductor, perform the installation of the deepwater drilling conductor. Solve the real-time bearing capacity of the deepwater drilling conductor through the mechanical relationship between the operating parameters during the installation operation of the deepwater drilling conductor, so as to real-time correct the installation depth of the deepwater drilling conductor until the installation of the deepwater drilling conductor is completed.

[0086] Wherein: During the installation process of the deepwater drilling conductor, the conductor is lowered to a certain depth by the combination of water jet and the gravity of the jet drilling tool. During the jet lowering process, the drill pipe is connected to the deepwater drilling conductor string through a feeding tool. The pipe string above the mud line is in a tensile state by the upward pulling force of the platform on the drill pipe, and the neutral point is kept below the mud line. Generally, the speed of the deepwater drilling conductor during the lowering and installation process is generally 0.3 m / min to 0.4 m / min. Assuming that the jet lowering speed of the deepwater drilling conductor is uniform and the bottom drilling pressure is W b , the side friction of the deepwater drilling conductor is W f , the self-weight of the deepwater drilling conductor is G2, the self-weight of the jet drilling tool combination is G1, the self-weight of the wellhead and the anti-settlement plate is G3, and the upward pulling force of the pipe string is T, as Figure 2 shown.

[0087] It can be known from the force analysis that:

[0088] T + W f + W b = G1 + G2 + G3 (5)

[0089] Wherein:

[0090] T is the upward pulling force of the pipe string;

[0091] W b is the bottom drilling pressure;

[0092] W f is the side friction of the deepwater drilling conductor;

[0093] G2 is the self-weight of the deepwater drilling conductor;

[0094] G1 is the self-weight of the jet drilling tool combination;

[0095] G3 is the self-weight of the wellhead and the anti-settlement plate.

[0096] During on-site operations, the self-weight of the conductor, the self-weight of the jet drill string assembly, and the self-weight of the wellhead and the anti-settlement plate are all known. The bottom hole pressure and the pipe string lifting force vary with the depth of penetration and can also be obtained according to the on-site operation parameters. Therefore, the lateral friction force of the deepwater drilling conductor at different depths is calculated according to formula (6).

[0097] W f (l) = G1 + G2 + G3 - W b (l) - T(l) (6)

[0098] Where:

[0099] l is the installation depth;

[0100] W f (l) is the lateral friction force of the deepwater drilling conductor at different depths;

[0101] W b (l) is the bottom hole pressure at the installation depth;

[0102] T(l) is the pipe string lifting force at the installation depth.

[0103] According to the pile-soil interaction theory, the lateral friction force of the conductor is calculated by formula (7):

[0104]

[0105] Where:

[0106] f(l) is the unit lateral friction force at the installation depth.

[0107] By combining formula (5) and formula (6), formula (8) can be obtained to calculate the unit lateral friction force of the conductor at different depths as:

[0108]

[0109] Since hydraulic jetting is used during the installation of the deepwater drilling conductor, it causes great disturbance to the soil mass. Therefore, after the installation of the conductor is completed, the soil stress recovers, and the lateral friction force of the deepwater drilling conductor will gradually recover with time. The lateral friction force at the moment when the jetting ends is the friction force at the recovery time moment t = 0. Therefore, the calculation model of the real-time lateral friction force of the deepwater drilling conductor is obtained:

[0110]

[0111] In the formula:

[0112] K t is the bearing capacity recovery coefficient at time t, which is calculated by formula (10);

[0113] $K_0$ is the initial bearing capacity recovery coefficient ($t = 0$);

[0114] is the real-time lateral friction of the deepwater drilling conductor.

[0115] Among them: Combining the soil parameters and engineering environment in the South China Sea, the empirical expression of the bearing capacity recovery coefficient is obtained:

[0116] $K$ t $= 0.04\ln(t)+0.03 (10)$

[0117] Since the deepwater drilling conductor is a thin-walled hollow pipe, the tip resistance of the deepwater drilling conductor pile can be ignored, and the lateral friction of the deepwater drilling conductor is the real-time bearing capacity of the deepwater drilling conductor.

[0118] is the real-time bearing capacity during the installation of the drilling conductor. Combining the wellhead load during the installation process, the mud penetration depth of the conductor can be corrected in real time, or measures to reduce the wellhead load can be taken to ensure the safety of on-site operations.

[0119] S3: During the installation of the deepwater drilling conductor, using the theory of pile-soil interaction, the shear strength after soil disturbance during the installation process of the deepwater drilling conductor is analyzed according to the operation parameters, providing a basis for the theoretical design of the conductor depth of adjacent wells in the future.

[0120] The shear strength after soil disturbance during the installation process of the deepwater drilling conductor is calculated by the following formula:

[0121]

[0122] Among them:

[0123] $S$ u $(l)$ is the shear strength after soil disturbance during the installation process.

[0124] Embodiment 2

[0125] Example 1 provided a method for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters. Correspondingly, this example provides a system for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters. The system for designing the installation depth of deepwater drilling conductors provided in this example can implement the method for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters in Example 1. This three-dimensional characterization system can be implemented in software, hardware, or a combination of both. For example, the system for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters can include integrated or separate functional modules or functional units to execute the corresponding steps in the methods of Example 1. Since the system for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters in this example is basically similar to the method example, the description process in this example is relatively simple. For related parts, refer to the partial description in Example 1. The system for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters in this example is only illustrative.

[0126] The system for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters provided in this example includes:

[0127] A first processing unit that uses the soil parameters of adjacent wells to perform a preliminary design of the installation of deepwater drilling conductors, and obtains the bearing capacity of deepwater drilling conductors and the penetration depth of deepwater drilling conductors into the mud;

[0128] A second processing unit that uses the obtained bearing capacity of deepwater drilling conductors and the penetration depth of deepwater drilling conductors into the mud to perform the installation of deepwater drilling conductors, solves the real-time bearing capacity of deepwater drilling conductors through the mechanical relationships between operation parameters during the installation operation of deepwater drilling conductors, and thus real-time corrects the installation depth of deepwater drilling conductors until the installation of deepwater drilling conductors is completed;

[0129] A third processing unit that, during the installation of deepwater drilling conductors, uses the theory of pile-soil interaction to analyze the shear strength of the soil after disturbance during the installation process of deepwater drilling conductors based on operation parameters, and provides a basis for the theoretical design of the conductor depth of adjacent wells in the future.

[0130] Example 3

[0131] This example provides a processing device for implementing the method for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters provided in Example 1. The processing device can be a processing device for a client, such as a mobile phone, laptop computer, tablet computer, desktop computer, etc., to execute the method for designing the installation depth of deepwater drilling conductors based on the mechanical relationships between operation parameters in Example 1.

[0132] The processing device includes a processor, a memory, a communication interface, and a bus. The processor, the memory, and the communication interface are connected through the bus to complete communication with each other. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the method for designing the installation depth of a deep-water drilling conductor based on the mechanical relationship between operation parameters provided in Embodiment 1 of the present invention.

[0133] Preferably, the memory may be a high-speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory, such as at least one disk memory.

[0134] Preferably, the processor may be various types of general-purpose processors such as a central processing unit (CPU), a digital signal processor (DSP), etc., which are not limited herein.

[0135] Embodiment 4

[0136] The method for designing the installation depth of a deep-water drilling conductor based on the mechanical relationship between operation parameters in Embodiment 1 of the present invention can be specifically implemented as a computer program product. The computer program product may include a computer-readable storage medium, on which computer-readable program instructions for executing the method for designing the installation depth of a deep-water drilling conductor based on the mechanical relationship between operation parameters described in Embodiment 1 of the present invention are uploaded.

[0137] A computer-readable storage medium may be a tangible device that holds and stores instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the above.

[0138] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing the installation depth of a deepwater drilling pipe based on the mechanical relationship between operating parameters, characterized in that: The steps include: Use the soil parameters of adjacent wells to make a preliminary design for deepwater drilling pipe installation, and obtain the bearing capacity and penetration depth of deepwater drilling pipe; The deepwater drilling pipe installation is performed by using the obtained bearing capacity of the deepwater drilling pipe and the depth of the deepwater drilling pipe inserted into the mud, and the real-time bearing capacity of the deepwater drilling pipe is solved by the mechanical relationship between various operation parameters during the deepwater drilling pipe installation operation, so as to correct the installation depth of the deepwater drilling pipe in real time until the deepwater drilling pipe is installed; When installing the deepwater drilling pipe, the pile-soil interaction theory is used to analyze the shear strength of the soil after disturbance during the deepwater drilling pipe installation process according to the operation parameters, providing a basis for the theoretical design of the pipe depth of subsequent adjacent wells.

2. The deepwater drilling pipe installation depth design method based on the mechanical relationship between operating parameters according to claim 1 is characterized in that: The bearing capacity of the deepwater drilling pipe is calculated by the following formula: f u =αs u (2) in: F u The bearing capacity of deepwater drilling pipe; D is the outer diameter of the catheter; f u is the friction force per unit contact area between pipe and soil; α is the adhesion coefficient, which is 0.9 to 0.95 in deep water according to experiments; s u Represents the undrained shear strength of the stratum encountered.

3. The deepwater drilling pipe installation depth design method based on the mechanical relationship between operating parameters according to claim 2 is characterized in that: The depth of the deepwater drilling pipe into the mud is calculated by the following formula: F u ≥W (3) in: W is the wellhead load; H min The depth of drilling pipe into mud; is the average friction force per unit contact area of ​​pipe-soil in shallow soil.

4. The deepwater drilling pipe installation depth design method based on the mechanical relationship between operating parameters according to claim 3 is characterized in that: The real-time bearing capacity of deepwater drilling pipe is calculated by the following formula: T+W f +W b =G1+G2+G3 (5) W f (l)=G1+G2+G3-W b (l)-T(l) (6) K t =0.04ln(t)+0.03 (10) in: W b is the bottom drilling pressure; W f It is the side friction of deepwater drilling pipe; G2 is the deadweight of the deepwater drilling casing; G1 is the deadweight of the jet drilling tool assembly; G3 is the deadweight of the wellhead and anti-sinking plate; T is the lifting force of the pipe string; W f (l) is the side friction of deepwater drilling pipe at different depths; K t is the bearing capacity recovery coefficient at time t; K0 is the recovery coefficient of the initial bearing capacity when t = 0; F ut Real-time bearing capacity for the drilling pipe installation process; l is the installation depth; W b (l) is the drilling pressure at the installation depth; T(l) is the lifting force of the pipe string at the installation depth; f(l) is the unit side friction at the installation depth.

5. The deepwater drilling pipe installation depth design method based on the mechanical relationship between operating parameters according to claim 4 is characterized in that: The shear strength of the soil after disturbance during the installation of the deepwater drilling pipe is calculated by the following formula: in: S u (l) is the shear strength of the soil after disturbance during installation.

6. A deepwater drilling pipe installation depth design system based on the mechanical relationship between operating parameters, characterized in that: include: The first processing unit uses the soil parameters of the adjacent wells to perform a preliminary design of the deepwater drilling pipe installation, and obtains the bearing capacity of the deepwater drilling pipe and the depth of the deepwater drilling pipe into the mud; The second processing unit uses the obtained bearing capacity of the deepwater drilling pipe and the depth of the deepwater drilling pipe inserted into the mud to install the deepwater drilling pipe, and solves the real-time bearing capacity of the deepwater drilling pipe through the mechanical relationship between various operation parameters during the deepwater drilling pipe installation operation, so as to correct the installation depth of the deepwater drilling pipe in real time until the deepwater drilling pipe is installed; The third processing unit, when installing the deepwater drilling casing, uses the pile-soil interaction theory to analyze the shear strength of the soil after disturbance during the deepwater drilling casing installation process according to the operation parameters, so as to provide a basis for the theoretical design of the casing depth of subsequent adjacent wells.

7. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operating parameters as claimed in any one of claims 1 to 5 are implemented.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for designing the installation depth of a deepwater drilling conductor based on the mechanical relationship between operating parameters as recited in any one of claims 1 to 5 are performed.

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