Method and device for determining drilling comprehensive extension limit of horizontal well

Abstract

The invention discloses a method and device for determining the comprehensive extension limit of horizontal well drilling, and the method comprises the steps: inputting a first constraint parameter and a first influence parameter into a mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; inputting the second influence parameter into a naked eye extension limit prediction model, and outputting a naked eye extension limit; inputting the second constraint parameter and the third influence parameter into a hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; and inputting the mechanical extension limit, the naked eye extension limit and the hydraulic extension limit into the comprehensive extension limit prediction model, and outputting the comprehensive extension limit. Related constraint conditions are introduced, and the comprehensive extension limit can be accurately determined.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and in particular to a method and device for determining the comprehensive extension limit of horizontal well drilling. Background Art

[0002] Under specific subjective and objective constraints, the drilling depth of any horizontal well has a limit, known as the integrated extension limit, which can be divided into three sub-concepts: the openhole extension limit, the mechanical extension limit, and the hydraulic extension limit. Reasonable prediction of the integrated extension limit not only explains the shape of the current drilled well limit envelope but also provides theoretical guidance for optimizing drilling design and ensuring safe drilling operations.

[0003] The existing technology has not yet formed a systematic comprehensive extension limit prediction model, and has not conducted extensive research on the subjective and objective constraints of the model, resulting in insufficient practicality of the model and poor accuracy in comprehensive extension limit prediction, that is, the comprehensive extension limit cannot be accurately determined.

[0004] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0005] The embodiments of this specification provide a method and apparatus for determining the comprehensive extension limit of horizontal well drilling to solve the problem that the prior art does not introduce relevant constraints and cannot accurately determine the comprehensive extension limit.

[0006] In a first aspect, an embodiment of this specification provides a method for determining a comprehensive extension limit of horizontal well drilling, the method comprising:

[0007] Inputting the first constraint parameter and the first influencing parameter into a mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output;

[0008] inputting the second influencing parameter into a naked eye extension limit prediction model and outputting a naked eye extension limit;

[0009] Inputting the second constraint parameter and the third influencing parameter into a hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output;

[0010] The mechanical extension limit, open hole extension limit and hydraulic extension limit are input into the comprehensive extension limit prediction model to output the comprehensive extension limit.

[0011] In some embodiments, the first constraint parameter includes at least one of the following: hook load, turntable torque, drill bit drilling pressure, drill bit torque and equivalent stress on the tubing, and the first constraint condition corresponding to the first constraint parameter includes at least one of the following: the hook load is between the upper and lower limits of the rated hook load of the drilling rig, the turntable torque does not exceed the upper limit of the rated torque of the drilling rig, the drill bit drilling pressure when the tubing is lowered into the drill bit is not less than the lower limit of the rock breaking threshold drilling pressure and the drill bit torque is not less than the lower limit of the rock breaking threshold torque, the drill bit drilling pressure when the tubing is rotated and lifted is not less than the drill bit sticking resistance and the drill bit torque is not less than the drill bit sticking torque, the equivalent stress of the tubing does not exceed the allowable stress, the axial force at the tubing stuck point is equal to the mechanical resistance of the joint stuck, the torque of the tubing body does not exceed the maximum torque that the tubing body can withstand, and the torque of the tubing joint does not exceed the maximum torque that the tubing joint can withstand.

[0012] In some embodiments, continuously adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output includes:

[0013] adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter, and outputting an initial target well depth based on the adjusted first constraint parameter and the first influencing parameter;

[0014] Continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a first target well depth based on the second-adjusted first constraint parameter and the first influencing parameter;

[0015] Determine whether the first target well depth is greater than the initial target well depth; if so, continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a second target well depth based on the three adjusted first constraint parameters and the first influencing parameter;

[0016] Determine whether the second target well depth is greater than the first target well depth. If not, stop adjusting the first constraint parameter and use the first target well depth as the mechanical extension limit. The first target well depth is greater than the corresponding well depth threshold.

[0017] In some embodiments, the second influencing parameter includes the second influencing parameter of the annulus single-phase flow and the second influencing parameter of the annulus two-phase flow, and the second influencing parameter of the annulus single-phase flow includes at least one of the following: equivalent density of fracture pressure, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections, annulus friction coefficient, average flow rate of annulus drilling fluid, annulus outer diameter, annulus inner diameter and eccentricity coefficient, and the second influencing parameter of the annulus two-phase flow includes at least one of the following: equivalent density of fracture pressure, rock cuttings density, solid phase volume fraction, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections and horizontal section annulus pressure loss gradient; accordingly, the open hole extension limit prediction model includes the open hole extension limit model of annulus single-phase flow and the open hole extension limit model of annulus two-phase flow; accordingly, the open hole extension limit includes the open hole extension limit of annulus single-phase flow and the open hole extension limit of annulus two-phase flow.

[0018] In some embodiments, the second constraint parameter includes at least one of the following: ground pressure and cuttings bed thickness, and the second constraint condition corresponding to the second constraint parameter includes at least one of the following: the ground pressure does not exceed the upper limit of the rated pump pressure of the drilling pump, and the cuttings bed thickness does not exceed the upper limit of the allowable thickness.

[0019] In some embodiments, continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output includes:

[0020] adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and outputting an initial well depth based on the adjusted second constraint parameter and the third influencing parameter;

[0021] Continue adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the first well depth based on the second-adjusted second constraint parameter and the third influencing parameter;

[0022] Determine whether the first well depth is greater than the initial well depth; if so, continue adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter, and output a second well depth based on the three adjusted second constraint parameters and the third influencing parameter;

[0023] Determine whether the second well depth is greater than the first well depth. If so, stop adjusting the second constraint parameter and use the first well depth as the hydraulic extension limit, where the first well depth is greater than the corresponding well depth threshold.

[0024] In some embodiments, inputting the mechanical extension limit, the open hole extension limit, and the hydraulic extension limit into the comprehensive extension limit prediction model to output the comprehensive extension limit includes:

[0025] The mechanical extension limit, open hole extension limit and hydraulic extension limit are input into the comprehensive extension limit prediction model. The mechanical extension limit, open hole extension limit and hydraulic extension limit are compared based on the comprehensive extension limit prediction model. The limit extension that is less than the preset comparison threshold is determined from the comparison results as the comprehensive extension limit and the comprehensive extension limit is output.

[0026] In a second aspect, an embodiment of this specification further provides a device for determining a comprehensive extension limit of horizontal well drilling, the device comprising:

[0027] a mechanical extension limit determination module, inputting the first constraint parameter and the first influencing parameter into the mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output;

[0028] a naked eye extension limit determination module, which inputs the second influencing parameter into the naked eye extension limit prediction model and outputs the naked eye extension limit;

[0029] a hydraulic extension limit determination module, inputting the second constraint parameter and the third influencing parameter into the hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output;

[0030] The comprehensive extension limit determination module inputs the mechanical extension limit, the open hole extension limit and the hydraulic extension limit into the comprehensive extension limit prediction model and outputs the comprehensive extension limit.

[0031] On the third aspect, the embodiments of this specification also provide a computer device, including a memory, a processor and a computer program / instructions stored in the memory, wherein the processor executes the computer program / instructions to implement the steps of the above-mentioned method for determining the comprehensive extension limit of horizontal well drilling.

[0032] Fourthly, an embodiment of this specification further provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for determining the comprehensive extension limit of horizontal well drilling.

[0033] The embodiments of this specification provide a method and apparatus for determining the comprehensive extension limit of horizontal well drilling. First, a first constraint parameter and a first influencing parameter are input into a mechanical extension limit prediction model. The first constraint parameter is continuously adjusted under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output. Then, a second influencing parameter is input into an openhole extension limit prediction model, and the openhole extension limit is output. Then, a second constraint parameter and a third influencing parameter are input into a hydraulic extension limit prediction model. The second constraint parameter is continuously adjusted under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output. Finally, the mechanical extension limit, the openhole extension limit, and the hydraulic extension limit are input into a comprehensive extension limit prediction model, and the comprehensive extension limit is output. In the embodiments of this specification, by introducing a first constraint condition and continuously adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, the mechanical extension limit can be accurately predicted. By inputting a second influencing parameter into the openhole extension limit prediction model, the openhole extension limit can be accurately and efficiently predicted. By introducing a second constraint condition and continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, the hydraulic extension limit can be accurately predicted. The outputs of the above extension limit models are then used as the input of the comprehensive extension limit prediction model, which can accurately and efficiently predict the comprehensive extension limit of horizontal well drilling and provide a theoretical reference for on-site drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 This is a flow chart of a method for determining the comprehensive extension limit of horizontal well drilling provided in an embodiment of this specification;

[0036] Figure 2 Schematic diagram of calculation results of mechanical extension limit under different friction coefficients under sliding lifting conditions provided in the embodiments of this specification;

[0037] Figure 3 Schematic diagram of calculation results of mechanical extension limit under different friction coefficients in sliding drilling conditions provided in the embodiments of this specification;

[0038] Figure 4 Schematic diagram of calculation results of mechanical extension limit under different friction coefficients under the rotating lifting working condition provided in the embodiment of this specification;

[0039] Figure 5 1 is a schematic diagram of calculation results of mechanical extension limit under different friction coefficients under rotary drilling conditions provided in the embodiments of this specification;

[0040] Figure 6 This is a schematic diagram of the calculation results of the naked eye extension limit under different displacements provided in the embodiments of this specification;

[0041] Figure 7 This is a schematic diagram of the calculation results of the hydraulic extension limit under different displacements provided in the embodiments of this specification;

[0042] Figure 8 Schematic diagram of calculation results of the comprehensive extension limit of the mechanical extension limit before and after adding the constraint conditions provided in the embodiment of this specification;

[0043] Figure 9 This is a schematic diagram of the structure of a device for determining the comprehensive extension limit of horizontal well drilling provided in an embodiment of this specification;

[0044] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this specification. DETAILED DESCRIPTION

[0045] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this specification without creative effort shall fall within the scope of protection of this specification.

[0046] As mentioned above, under specific subjective and objective constraints, the drilling depth of any horizontal well has a limit value, which is called the comprehensive extension limit, which can include three sub-concepts: open hole extension limit, mechanical extension limit and hydraulic extension limit.

[0047] The open hole extension limit refers to the well depth at which the open hole bottom is crushed or leaking, which is mainly determined by the safe drilling density window of the actual drilling formation and the multiphase flow circulation pressure loss in the drilling annulus. The mechanical extension limit can include the drill string operation limit and the casing operation limit, which is mainly determined by the steering control mode (sliding steering or rotary steering) of the extended reach horizontal well, the strength of the pipe, the wellbore constraint, the pipe string load, the drilling rig power, etc. The hydraulic extension limit refers to the well depth allowed by the drilling hydraulics while maintaining normal circulation of the drilling fluid and the wellbore cleanliness. It is mainly determined by the drilling rig pump, drill string, surface manifold, hydraulic parameters and mechanical penetration rate.

[0048] At present, most studies on the comprehensive extension limit of horizontal well drilling only establish simplified mathematical models by considering certain factors, or conduct quantitative and qualitative analysis based on drilling data and field experience. They have not formed a systematic prediction model, and have not expanded the subjective and objective constraints of the model. As a result, the model is not practical enough and the prediction accuracy is difficult to guarantee, resulting in the inability to accurately determine the comprehensive extension limit of horizontal well drilling.

[0049] To address the above-mentioned issues, the embodiments of this specification provide a method and apparatus for determining the comprehensive extension limit of horizontal well drilling. First, a first constraint parameter and a first influencing parameter are input into a mechanical extension limit prediction model. The first constraint parameter is continuously adjusted under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output. Then, a second influencing parameter is input into a naked hole extension limit prediction model, and the naked hole extension limit is output. Then, a second constraint parameter and a third influencing parameter are input into a hydraulic extension limit prediction model. The second constraint parameter is continuously adjusted under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output. Finally, the mechanical extension limit, the naked hole extension limit, and the hydraulic extension limit are input into a comprehensive extension limit prediction model, and the comprehensive extension limit is output.

[0050] By introducing a first constraint and continuously adjusting the first constraint parameter within the first constraint condition corresponding to the first constraint parameter, the mechanical extension limit can be accurately predicted. By inputting the second influencing parameter into the openhole extension limit prediction model, the openhole extension limit can be accurately and efficiently predicted. By introducing a second constraint and continuously adjusting the second constraint parameter within the second constraint condition corresponding to the second constraint parameter, the hydraulic extension limit can be accurately predicted. By using the outputs of each of these extension limit models as input to a comprehensive extension limit prediction model, the comprehensive extension limit for horizontal well drilling can be accurately and efficiently predicted, providing a theoretical reference for on-site drilling operations.

[0051] It should be noted that the terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of this application.

[0052] It is understood that the above methods provided in the embodiments of this specification can be applied to electronic devices, which can refer to electronic devices with data computing, processing, and storage capabilities. The electronic device can be a terminal such as a PC (Personal Computer), a tablet computer, a smartphone, a wearable device, an intelligent robot, etc.; it can also be a server. The server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0053] See Figure 1 As shown, the embodiment of this specification provides a method for determining the comprehensive extension limit of horizontal well drilling. In specific implementation, the method may include the following contents:

[0054] S101: Inputting a first constraint parameter and a first influencing parameter into a mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output.

[0055] In some embodiments, the first constraint parameter in the above S101 may include at least one of the following: large hook load, turntable torque, drill bit drilling pressure, drill bit torque and equivalent stress on the tubing. The first constraint condition corresponding to the above first constraint parameter may include at least one of the following: the large hook load is between the upper and lower limits of the rated hook load of the drilling rig, the turntable torque does not exceed the upper limit of the rated torque of the drilling rig, the drill bit drilling pressure when the tubing is lowered into the drill bit for drilling is not less than the lower limit of the rock breaking threshold drilling pressure and the drill bit torque is not less than the lower limit of the rock breaking threshold torque, the drill bit drilling pressure when the tubing is rotated and lifted is not less than the drill bit sticking resistance and the drill bit torque is not less than the drill bit sticking torque, the equivalent stress of the tubing does not exceed the allowable stress, the axial force at the tubing stuck point is equal to the mechanical resistance of the joint stuck, the torque of the tubing body does not exceed the maximum torque that the tubing body can withstand, and the torque of the tubing joint does not exceed the maximum torque that the tubing joint can withstand.

[0056] Specifically, the first constraint condition may be a constraint condition of mechanical extension limit, which may include:

[0057] (1) Ground restraints:

[0058] Hook load constraint (Hook load HL cal Located at the upper limit HL of the rated hook load of the drilling rig rig u With the lower limit HL rig l Between): HL rig l ≤|HL cal |≤HL rig u , among which, HL rigl Usually 0.

[0059] Turntable torque constraint (turntable torque TOR cal Do not exceed the upper limit of the rated torque TOR of the drilling rig rig u ): TOR cal ≤TOR rig u .

[0060] (2) Drill bit constraint:

[0061] The constraints when the drill string is lowered into the drill bit (the drill bit pressure F B Not less than the rock breaking threshold drilling pressure lower limit F ths l and drill torque M TB Not less than the lower limit of rock breaking torque M Tths l ):|F B |≥F ths l ,M TB ≥M Tths l .

[0062] The constraint when the pipe string is rotated and lifted (bit bit pressure F B Not less than the drill bit sticking resistance F stuck and drill torque M TB Not less than the drill bit stuck torque M Tstuck ):|F B |≥F stuck ,M TB ≥M Tstuck , where F stuck and M Tstuck Usually 0.

[0063] (3) String failure constraints:

[0064] The equivalent stress σ of the pipe string does not exceed the allowable stress [σ]: Among them, σ m is the equivalent axial stress considering the hydraulic effect of drilling fluid, σ b is the bending stress on the pipe section, σ d is the equivalent shear stress generated by the drilling fluid hydraulic pressure, τ c is the shear stress on the pipe section.

[0065] (4) Mechanical resistance constraint of the pipe string:

[0066] Axial force F at the pipe string blocking point c Equal to the mechanical resistance of the connector in, The value is usually derived from field data.

[0067] Because the open hole created during drilling is often not a regular cylindrical shape, it exhibits certain irregularities. Due to drilling fluid erosion and rock fracturing, the wellbore is prone to localized block loss or even collapse, resulting in irregularities such as grooves and protrusions on the wellbore wall. This creates a certain degree of instability, and the difficulty in recovering fallen cuttings exacerbates the wellbore's irregularities. Therefore, during the raising and lowering of the tubing string, in addition to the constraints imposed by the surface and the drill bit, there is also the mechanical resistance constraint of the tubing string itself. This constraint arises from the irregularities of the wellbore. Because the joints of the tubing assembly are prone to falling into grooves on the wellbore wall or getting stuck on irregularities such as protrusions, the tubing string's mechanical resistance constraint primarily exists at the tubing string joints. Similar to the drill bit constraint, an artificial mechanical resistance is applied at the joints to simulate tubing resistance, resulting in the aforementioned tubing string mechanical resistance constraint.

[0068] (5) String torsional constraint:

[0069] The torsional constraint of the pipe body (the torque M TP Do not exceed the maximum torque that the pipe string can withstand ): in, Usually measured by experiment.

[0070] String joint torsional constraint (Torque M of string joint TC Do not exceed the maximum torque that the pipe joint can withstand ): in, Usually measured by experiment.

[0071] During rotary drilling, the tubing string is often in a rotating state. At this time, the tubing string itself is subjected to a certain torque. Although the tubing string itself requires a certain torque transmission capacity, the torque value cannot exceed the maximum torque that the tubing string can withstand, otherwise the tubing string will suffer torsional failure. Based on this, the above-mentioned torsional constraint of the tubing string body is formed.

[0072] Similarly, as the hub for torque transmission between pipe strings, the torsional resistance of the pipe string joint is also very important. Therefore, the torque at the pipe string joint cannot exceed the maximum torque the joint can withstand. Based on this, the above-mentioned torsional constraint of the pipe string joint is formed.

[0073] Based on the above embodiments, an extended study was conducted on the constraint conditions of the mechanical extension limit (the first constraint condition), and the constraint conditions of the mechanical extension limit were expanded to include ground constraints, drill bit constraints, tubing failure constraints, tubing mechanical resistance constraints, and tubing torsional constraints. This can effectively improve the prediction accuracy of the mechanical extension limit prediction model, thereby accurately predicting the mechanical extension limit.

[0074] In some embodiments, the first influencing parameter in the above S101 may be a parameter affecting the mechanical extension limit, and may include at least one of the following: design parameters (design parameters may include tubing combinations, wellbore trajectories, drag reduction joints, etc.), operating conditions (operating conditions may include tubing lifting and lowering operations in sliding and rotary drilling modes).

[0075] The mechanical extension limit prediction model may include a first constraint condition (or an allowable space of the first constraint parameter) and a first target well depth function. The first target well depth function may be expressed as:

[0076]

[0077] Among them, L is the first target well depth function; L(.) is usually expressed in the form of an implicit function, specifically the overall mechanical model of the downhole tubing; p is the first constraint parameter; d is the design parameter; P is the allowable space of the first constraint parameter p, given in the form of the first constraint condition; p* is the optimal first constraint parameter, and the maximum well depth under the optimal first constraint parameter can be taken as the mechanical extension limit; c is the operating condition.

[0078] The mathematical meaning of the above first target well depth function is that for a specific drilling system, under certain design parameters d and operating conditions c, the maximum wellbore length that can be achieved within its first constraint space P with the first constraint parameter p can be used as the mechanical extension limit (the mechanical extension limit refers to the maximum wellbore depth that can be safely drilled based on the mechanical performance of the drilling system under a specific drilling system and wellbore constraints).

[0079] In some embodiments, the above-mentioned step S101 of continuously adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output may include:

[0080] adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter, and outputting an initial target well depth based on the adjusted first constraint parameter and the first influencing parameter;

[0081] Continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a first target well depth based on the second-adjusted first constraint parameter and the first influencing parameter;

[0082] Determine whether the first target well depth is greater than the initial target well depth; if so, continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a second target well depth based on the three adjusted first constraint parameters and the first influencing parameter;

[0083] Determine whether the second target well depth is greater than the first target well depth. If not, stop adjusting the first constraint parameter and use the first target well depth as the mechanical extension limit. The first target well depth is greater than the corresponding well depth threshold.

[0084] Specifically, the first constraint parameters (such as hook load, turntable torque, drill bit weight on bit, drill bit torque and equivalent stress on the tubing) can be continuously adjusted under the first constraint conditions until the first constraint parameters are adjusted to the optimal first constraint parameters. At this time, the maximum well depth can be output based on the optimal first constraint parameters and the first influencing parameters, which is used as the mechanical extension limit.

[0085] For example, the first constraint parameter can be adjusted under the first constraint condition. Based on the adjusted first constraint parameter and the first influencing parameter, an initial target well depth is output. The first constraint parameter can then be adjusted again under the first constraint condition, and based on the adjusted first constraint parameter and the first influencing parameter, the first target well depth is output. If the first target well depth is greater than the initial target well depth, the first constraint parameter can be adjusted again under the first constraint condition, and based on the adjusted first constraint parameter and the first influencing parameter, a second target well depth is output. If the second target well depth is less than the first target well depth, the second adjustment indicates that the optimal first constraint parameter was obtained. The corresponding first target well depth is maximized, i.e., greater than the corresponding well depth threshold. The first target well depth can be used as the mechanical extension limit. If the second target well depth is greater than the first target well depth, the first constraint parameter can be adjusted again until the first constraint parameter is adjusted to the optimal first constraint parameter, and the maximum well depth is output. If the first target well depth is less than the initial target well depth, the optimal first constraint parameter was obtained after a single adjustment. The corresponding initial target well depth is maximized, i.e., greater than the corresponding well depth threshold. The initial target well depth can be used as the mechanical extension limit. The initial target well depth, etc. is used to distinguish it from the subsequent initial well depth, etc. Of course, it can also be replaced with other expressions that can distinguish the two, and this specification does not make specific limitations on this.

[0086] S102: Input the second influencing parameter into the naked eye extension limit prediction model, and output the naked eye extension limit.

[0087] In some embodiments, the second influencing parameter in the above-mentioned S102 may include the second influencing parameter of the annulus single-phase flow and the second influencing parameter of the annulus two-phase flow. The above-mentioned second influencing parameter of the annulus single-phase flow may include at least one of the following: equivalent density of fracture pressure, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections, annulus friction coefficient, average flow rate of annulus drilling fluid, annulus outer diameter, annulus inner diameter and eccentricity coefficient. The above-mentioned second influencing parameter of the annulus two-phase flow may include at least one of the following: equivalent density of fracture pressure, rock cuttings density, solid phase volume fraction, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections and horizontal section annulus pressure loss gradient; accordingly, the above-mentioned open hole extension limit prediction model may include an annulus single-phase flow open hole extension limit model and annulus two-phase flow open hole extension limit model; accordingly, the above-mentioned open hole extension limit may include the annulus single-phase flow open hole extension limit and the annulus two-phase flow open hole extension limit.

[0088] Specifically, the following assumptions can be made before constructing the openhole extension limit model for annular single-phase flow:

[0089] Extended-reach wells primarily refer to extended-reach horizontal wells. These wells are ideally clean boreholes, and the effect of cuttings on annular pressure drop is not considered, meaning the annulus is single-phase. Power-law fluids are used for simulation and analysis. The effect of drillstring eccentricity must be considered in highly deviated and horizontal sections, and the eccentricities of these sections are assumed to be consistent. The effects of borehole tortuosity and pipe wall roughness on annular pressure loss are not considered. Formation pressure systems at the same vertical depth are identical, ignoring the influence of abnormal bottomhole pressure systems. Complex formation conditions, such as original or potential fractures, bedding changes, and formation losses, are ignored. The fracture pressure in the horizontal section is constant. It should be noted that when predicting the openhole extension limit at a certain vertical depth, only the fracture pressure at that vertical depth is required. To facilitate sensitivity analysis of model parameters, it is assumed that the fracture pressure is the same across the entire horizontal section. Otherwise, multiple parameters in the model will change simultaneously, rendering the parameter sensitivity analysis meaningless.

[0090] Based on the above assumptions, the openhole extension limit model of annular single-phase flow is constructed as follows:

[0091]

[0092] Among them, L h-dri_1 is the open hole extension limit of annular single-phase flow, L is the well section length, m; ρ f is the burst pressure equivalent density, g / cm 3 ρ m is the drilling fluid density, g / cm 3 ;D v is the vertical depth of the wellbore, m; Δp vis the vertical section annular pressure loss; is the annular pressure loss of several inclined well sections; f a is the annular friction coefficient, dimensionless; v a is the average flow rate of the annular drilling fluid, m / s; D o is the outer diameter of the annulus, mm; D i is the inner diameter of the annulus, mm; R is the eccentricity coefficient, dimensionless.

[0093] The following assumptions can be made before constructing the openhole extension limit model of annular two-phase flow:

[0094] Extended reach wells refer to extended reach horizontal wells; power-law fluids are used for simulation and analysis; the influence of drill string eccentricity must be considered in highly deviated well sections and horizontal sections, and it is assumed that the eccentricities of these well sections are exactly the same; the influence of pipe wall roughness on annular pressure loss is not considered; the formation pressure systems at the same vertical depth are the same, and the influence of abnormal bottom hole pressure systems is ignored; complex formation conditions, such as the influence of original formation fractures or potential fractures, bedding changes, and formation leakage, are ignored; the fracture pressure of the horizontal section is a constant value; it should be noted that when predicting the open hole extension limit value at a certain vertical depth, it is only necessary to obtain the fracture pressure value at that vertical depth, but for the needs of parameter sensitivity analysis in the model, it is necessary to assume that the fracture pressure of the entire horizontal section is the same.

[0095] Based on the above assumptions, the openhole extension limit model of annular two-phase flow is constructed as follows:

[0096]

[0097] Among them, L h-dri_2 is the open hole extension limit of the annular two-phase flow, L is the well section length, m; ρ f is the burst pressure equivalent density, g / cm 3 ρ s is the solid phase density, i.e. the density of rock cuttings, g / cm 3 ; C s is the solid phase volume fraction, %; ρ m is the drilling fluid density, g / cm 3 ;D v is the vertical depth of the wellbore, m; Δp v is the vertical section annular pressure loss; The annular pressure loss of several inclined well sections; is the pressure loss gradient of the horizontal annulus.

[0098] The second influencing parameter of the annular single-phase flow can be input into the annular single-phase flow open hole extension limit model, and the annular single-phase flow open hole extension limit L can be output based on the annular single-phase flow open hole extension limit model. h-dri_1The second influencing parameter of the annular two-phase flow can be input into the annular two-phase flow open hole extension limit model, and the annular two-phase flow open hole extension limit L can be output based on the annular two-phase flow open hole extension limit model. h-dri_2 The second influencing parameter of the annular single-phase flow is a parameter that affects the open-hole extension limit of the annular single-phase flow, and the second influencing parameter of the annular two-phase flow is a parameter that affects the open-hole extension limit of the annular two-phase flow.

[0099] The openhole extension limit prediction model can be used to efficiently and accurately predict the openhole extension limit. The openhole extension limit prediction model can include an annular single-phase flow openhole extension limit model and an annular two-phase flow openhole extension limit model. Based on these two models, the openhole extension limit for annular single-phase flow and the openhole extension limit for annular two-phase flow can be predicted, respectively. This allows for a more comprehensive and accurate determination of the comprehensive extension limit for horizontal well drilling.

[0100] S103: Inputting the second constraint parameter and the third influencing parameter into the hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output.

[0101] In some embodiments, the second constraint parameter in S103 above may include at least one of the following: ground pressure and cuttings bed thickness, and the second constraint condition corresponding to the second constraint parameter may include at least one of the following: the ground pressure does not exceed the upper limit of the rated pump pressure of the drilling pump, and the cuttings bed thickness does not exceed the upper limit of the allowable thickness.

[0102] Specifically, the second constraint may be a hydraulic extension limit constraint, which may include:

[0103] Ground pressure P H Not exceeding the upper limit of the rated pump pressure P of the drilling pump rig u :P H ≤P rig u ;

[0104] Cuttings bed thickness H b (s) not exceeding the upper limit of the allowable thickness H bths u :H b (s)≤H bths u .

[0105] By introducing the constraint condition of the hydraulic extension limit (the second constraint), the prediction accuracy of the hydraulic extension limit prediction model can be improved, so that the hydraulic extension limit can be accurately predicted.

[0106] In some embodiments, the third influencing parameter in the above S103 may be a parameter that affects the hydraulic extension limit, and may include at least one of the following: annular pressure, pressure in the drill string, pump displacement, etc.

[0107] The hydraulic extension limit prediction model may include a second constraint condition (or an allowable space of a second constraint parameter) and a second target well depth function. The second target well depth function may be expressed as:

[0108] Γ H [P o (s),P i (s),H b (s),P H ,Q,...]=0

[0109] Among them, Γ H is the second target well depth function; P o (s) is the annular pressure; P i (s) is the pressure in the drill string; H b (s) is the thickness of the cuttings bed; P H is the ground pressure; Q is the pump displacement.

[0110] Under the second constraint, the second target well depth function can be solved to obtain the maximum well depth as the hydraulic extension limit (the hydraulic extension limit refers to the maximum well depth that can be drilled while ensuring normal fluid circulation and wellbore cleaning).

[0111] In some embodiments, the step of continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output in S103 may include:

[0112] adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and outputting an initial well depth based on the adjusted second constraint parameter and the third influencing parameter;

[0113] Continue adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the first well depth based on the second-adjusted second constraint parameter and the third influencing parameter;

[0114] Determine whether the first well depth is greater than the initial well depth; if so, continue adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter, and output a second well depth based on the three adjusted second constraint parameters and the third influencing parameter;

[0115] Determine whether the second well depth is greater than the first well depth. If so, stop adjusting the second constraint parameter and use the first well depth as the hydraulic extension limit, where the first well depth is greater than the corresponding well depth threshold.

[0116] Specifically, the second constraint parameter (such as ground pressure and cuttings bed thickness) can be continuously adjusted under the second constraint condition until the second constraint parameter is adjusted to the optimal second constraint parameter. At this time, the maximum well depth can be output based on the optimal second constraint parameter and the third influencing parameter (such as annular pressure, pressure in the drill string, and pump displacement), which is used as the hydraulic extension limit.

[0117] For example, the second constraint parameter can be adjusted under the second constraint first. Based on the adjusted second constraint parameter and the third influencing parameter, the initial well depth is output. The second constraint parameter can then be adjusted again under the second constraint, and based on the adjusted second constraint parameter and the third influencing parameter, the first well depth is output. If the first well depth is greater than the initial well depth, the second constraint parameter can be adjusted again under the second constraint, and based on the adjusted second constraint parameter and the third influencing parameter, the second well depth is output. If the second well depth is less than the first well depth, the second constraint parameter can be adjusted again under the second constraint, and the second well depth is output based on the adjusted second constraint parameter and the third influencing parameter. If the second well depth is less than the first well depth, the second constraint parameter can be adjusted again, indicating that the optimal second constraint parameter has been obtained. At this point, the corresponding first well depth is maximized, i.e., it exceeds the corresponding well depth threshold. The first well depth can be used as the hydraulic extension limit. If the second well depth is greater than the first well depth, the second constraint parameter can be adjusted again until the second constraint parameter reaches the optimal second constraint parameter. The maximum well depth can be output based on the optimal second constraint parameter. If the first well depth is less than the initial well depth, the optimal second constraint parameter can be obtained after a single adjustment, indicating that the corresponding initial well depth is maximized, i.e., it exceeds the corresponding well depth threshold. The initial well depth can be used as the hydraulic extension limit.

[0118] S104: Input the mechanical extension limit, the open hole extension limit, and the hydraulic extension limit into a comprehensive extension limit prediction model, and output the comprehensive extension limit.

[0119] In some embodiments, the step of inputting the mechanical extension limit, the open hole extension limit, and the hydraulic extension limit into the comprehensive extension limit prediction model and outputting the comprehensive extension limit in S104 may include:

[0120] The mechanical extension limit, open hole extension limit and hydraulic extension limit are input into the comprehensive extension limit prediction model. The mechanical extension limit, open hole extension limit and hydraulic extension limit are compared based on the comprehensive extension limit prediction model. The limit extension that is less than the preset comparison threshold is determined from the comparison results as the comprehensive extension limit and the comprehensive extension limit is output.

[0121] Specifically, a comprehensive extension limit prediction model can be constructed based on the mechanical extension limit, the open hole extension limit (which can include the open hole extension limit of annular single-phase flow and the open hole extension limit of annular two-phase flow), and the hydraulic extension limit:

[0122] L total =min[L(p*,d,c),L h-dri ,LΓH ]

[0123] Among them, L total is the comprehensive extension limit of horizontal well drilling; L(p*,d,c) is the mechanical extension limit; L h-dri is the open hole extension limit, which may include the annular single-phase flow open hole extension limit L h-dri_1 and the open hole extension limit L of annular two-phase flow h-dri_2 ; To extend the limit of hydraulic power.

[0124] The mechanical extension limit, open hole extension limit and hydraulic extension limit can be compared based on the comprehensive extension limit prediction model, and the extension limit less than the preset comparison threshold can be determined from the comparison results as the comprehensive extension limit, that is, the minimum of the mechanical extension limit, open hole extension limit and hydraulic extension limit can be selected as the comprehensive extension limit. For example: L(p*,d,c)=15,000m, L h-dri =12,000m, Then L total =10,000m.

[0125] Based on the mechanical extension limit prediction model, open hole extension limit prediction model and hydraulic extension limit prediction model for horizontal well drilling, and with the goal of minimizing the extension limit, a comprehensive extension limit prediction model for horizontal well drilling is proposed. This model can accurately predict the comprehensive extension limit during horizontal drilling, thus providing theoretical support for on-site drilling operations.

[0126] In some embodiments, corresponding drilling measures may be proposed based on the predicted mechanical extension limit, open hole extension limit, hydraulic extension limit, and comprehensive extension limit to improve drilling operation efficiency.

[0127] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. For details, please refer to the description of the aforementioned related processing embodiments, and no further description is given here.

[0128] The above describes the present invention. However, it is worth noting that this specific embodiment is only intended to better illustrate the present application and to describe specific embodiments of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0129] In a specific implementation scenario, taking Well X as an example, Well X has a measured depth of 1,532 meters, a vertical depth of 572 meters, and a horizontal section length of 818 meters, to illustrate the beneficial effects of applying the method for determining the comprehensive extension limit of horizontal well drilling provided by the present invention.

[0130] (1) Mechanical extension limit and naked eye extension limit

[0131] See Figure 2-Figure 5 As shown, Figure 2-Figure 5 The calculation results of the mechanical extension limit under different friction coefficients (such as FF1=0.15, FF1=0.20, FF1=0.25, FF1=0.30, FF1=0.35, FF2=0.20, FF2=0.25, FF2=0.30, FF2=0.35, FF2=0.40) for four working conditions, namely sliding lifting, sliding running, rotation lifting and rotation running, without considering mechanical resistance and string torsion, and considering mechanical resistance and string torsion, are shown respectively. The target well depth is consistently 1532m.

[0132] according to Figure 2-Figure 5 The calculation results shown in Figure 2 show that the mechanical extension limit decreases with increasing friction coefficient. It is easy to see that the calculated mechanical extension limit decreases after considering the two constraints of string mechanical resistance and string torsion. The sliding drilling mode is the primary constraint on the mechanical extension limit. In this mode, when the string mechanical resistance and string torsion constraints are not considered, the calculated extension limit is lower than the target well depth (1532 meters) when the friction coefficient is 0.35 in the casing section and 0.4 in the openhole section. However, when the string mechanical resistance and string torsion constraints are considered, the calculated mechanical extension limit is lower than the target well depth when the friction coefficient reaches 0.3 in the casing section and 0.35 in the openhole section. Therefore, during field operations, if the sliding drilling method is used, the friction coefficient should be further controlled to no more than 0.3 in the casing section and no more than 0.35 in the openhole section. This can minimize drilling risks. The rotary drilling method can meet the design requirements. For rotary drilling, the main factors constraining the mechanical extension limit are the rated torque of the top drive and the torsional resistance of the tubing string itself. It is recommended that the friction coefficient in the casing section be no higher than 0.25 and the friction coefficient in the openhole section be no higher than 0.30. Values above these limits will result in insufficient margin for the wellbore's mechanical extension limit.

[0133] See Figure 6 As shown, Figure 6The calculation results of the openhole extension limit at different displacement rates are presented. These results show that the openhole extension limit under rotary drilling conditions decreases with increasing displacement rate. When the displacement rate reaches 40 L / s, the calculated openhole extension limit is 1608 m. At this point, the extension limit margin is too small, at only 76 m, posing a certain risk to the drilling process. Therefore, considering the wellbore extension limit margin allows for appropriate control of the displacement rate and optimization of the drilling plan within the constraints of the openhole extension limit.

[0134] (2) Hydraulic extension limit

[0135] See Figure 7 As shown, Figure 7 The calculation results of the hydraulic extension limit at different displacement rates are presented. The hydraulic extension limit calculations show a decreasing trend under rotary running conditions with increasing displacement, but its value is higher than the openhole extension limit. When the displacement reaches 40 L / s, the hydraulic extension limit is calculated to be 2047 m. At this point, the extension limit margin is small, posing a certain risk to the drilling process. Therefore, considering the wellbore extension limit margin, the displacement rate can be appropriately controlled, and the drilling plan can be optimized to meet the hydraulic extension limit constraints.

[0136] (3) Comprehensive extension limit

[0137] See Figure 8 As shown, Figure 8 The calculation results of the combined extension limit before and after the addition of constraints to the mechanical extension limit (before the mechanical extension limit correction) are presented. The hydraulic extension limit and the openhole extension limit are set at a displacement of 30 L / s, and the friction coefficient for the mechanical extension limit is 0.25 for the casing section and 0.35 for the openhole section. Based on the calculation results of the combined extension limit, before the addition of constraints to the mechanical extension limit, the combined extension limit was 2689 meters, with the openhole extension limit being the primary constraint. After the addition of constraints to the mechanical extension limit, the combined extension limit was 2418 meters, with the mechanical extension limit being the primary constraint.

[0138] Although this specification provides examples such as the following examples or the accompanying Figure 9The method operation steps or device structure shown, but based on routine or no creative labor, the method or device may include more or fewer operation steps or module units after partial merger. In the steps or structures where there is no necessary causal relationship logically, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure shown in the embodiments or drawings of this specification. When the method or module structure described is applied to actual devices, servers or terminal products, it can be executed sequentially or in parallel according to the method or module structure shown in the embodiments or drawings (for example, a parallel processor or multi-threaded processing environment, or even a distributed processing, server cluster implementation environment). Based on the above-mentioned method for determining the comprehensive extension limit of horizontal well drilling, the embodiments of this specification also propose an embodiment of a device for determining the comprehensive extension limit of horizontal well drilling. As Figure 9 As shown, the device may specifically include the following modules:

[0139] The mechanical extension limit determination module 901 may be configured to input a first constraint parameter and a first influencing parameter into a mechanical extension limit prediction model, and continuously adjust the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output;

[0140] The naked eye extension limit determination module 902 may be configured to input the second influencing parameter into the naked eye extension limit prediction model and output the naked eye extension limit;

[0141] The hydraulic extension limit determination module 903 may be configured to input the second constraint parameter and the third influencing parameter into the hydraulic extension limit prediction model, and continuously adjust the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output;

[0142] The comprehensive extension limit determination module 904 may be configured to input the mechanical extension limit, the open hole extension limit, and the hydraulic extension limit into the comprehensive extension limit prediction model and output the comprehensive extension limit.

[0143] In some embodiments, the first constraint parameter in the above-mentioned mechanical extension limit determination module 901 may include at least one of the following: large hook load, turntable torque, drill bit drilling pressure, drill bit torque and equivalent stress on the tubing. The first constraint condition corresponding to the first constraint parameter may include at least one of the following: the large hook load is between the upper and lower limits of the rated hook load of the drilling rig, the turntable torque does not exceed the upper limit of the rated torque of the drilling rig, the drill bit drilling pressure when the tubing is lowered into the drill bit is not less than the lower limit of the rock breaking threshold drilling pressure and the drill bit torque is not less than the lower limit of the rock breaking threshold torque, the drill bit drilling pressure when the tubing is rotated and lifted is not less than the drill bit sticking resistance and the drill bit torque is not less than the drill bit sticking torque, the equivalent stress of the tubing does not exceed the allowable stress, the axial force at the tubing stuck point is equal to the mechanical resistance of the joint stuck, the torque of the tubing body does not exceed the maximum torque that the tubing body can withstand, and the torque of the tubing joint does not exceed the maximum torque that the tubing joint can withstand.

[0144] In some embodiments, the above-mentioned mechanical extension limit determination module 901 can be specifically used to adjust the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output the initial target well depth based on the first constraint parameter and the first influencing parameter adjusted once; continue to adjust the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output the first target well depth based on the second-adjusted first constraint parameter and the first influencing parameter; determine whether the first target well depth is greater than the initial target well depth, and if so, continue to adjust the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output the second target well depth based on the thrice-adjusted first constraint parameter and the first influencing parameter; determine whether the second target well depth is greater than the first target well depth, and if not, stop adjusting the first constraint parameter, and use the first target well depth as the mechanical extension limit, and the first target well depth is greater than the corresponding well depth threshold.

[0145] In some embodiments, the second influencing parameter in the above-mentioned open hole extension limit determination module 902 may include the second influencing parameter of the annulus single-phase flow and the second influencing parameter of the annulus two-phase flow, and the second influencing parameter of the annulus single-phase flow may include at least one of the following: equivalent density of fracture pressure, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections, annulus friction coefficient, average flow rate of annulus drilling fluid, annulus outer diameter, annulus inner diameter and eccentricity coefficient, and the second influencing parameter of the annulus two-phase flow may include at least one of the following: equivalent density of fracture pressure, rock cuttings density, solid phase volume fraction, drilling fluid density, vertical depth of wellbore, annulus pressure loss of the vertical section, annulus pressure loss of several inclined well sections and horizontal section annulus pressure loss gradient; accordingly, the open hole extension limit prediction model may include an annulus single-phase flow open hole extension limit model and annulus two-phase flow open hole extension limit model; accordingly, the open hole extension limit may include an annulus single-phase flow open hole extension limit and annulus two-phase flow open hole extension limit.

[0146] In some embodiments, the second constraint parameter in the hydraulic extension limit determination module 903 may include at least one of the following: ground pressure and cuttings bed thickness, and the second constraint condition corresponding to the second constraint parameter may include at least one of the following: the ground pressure does not exceed the upper limit of the rated pump pressure of the drilling pump, and the cuttings bed thickness does not exceed the upper limit of the allowable thickness.

[0147] In some embodiments, the above-mentioned hydraulic extension limit determination module 903 can be specifically used to adjust the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the initial well depth based on the second constraint parameter adjusted once and the third influencing parameter; continue to adjust the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the first well depth based on the second constraint parameter adjusted twice and the third influencing parameter; determine whether the first well depth is greater than the initial well depth, and if so, continue to adjust the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the second well depth based on the second constraint parameter adjusted thrice and the third influencing parameter; determine whether the second well depth is greater than the first well depth, and if so, stop adjusting the second constraint parameter, and use the first well depth as the hydraulic extension limit, and the first well depth is greater than the corresponding well depth threshold.

[0148] In some embodiments, the above-mentioned comprehensive extension limit determination module 904 can be specifically used to input the mechanical extension limit, the open hole extension limit and the hydraulic extension limit into the comprehensive extension limit prediction model, compare the mechanical extension limit, the open hole extension limit and the hydraulic extension limit based on the comprehensive extension limit prediction model, determine the limit extension less than the preset comparison threshold from the comparison results as the comprehensive extension limit and output the comprehensive extension limit.

[0149] As can be seen from the above, the device for determining the comprehensive extension limit of horizontal well drilling provided in the embodiments of this specification can accurately and efficiently predict the comprehensive extension limit of horizontal well drilling, providing a theoretical reference for on-site drilling operations.

[0150] An embodiment of this specification also provides an electronic device based on the above-mentioned method for determining the comprehensive extension limit of horizontal well drilling, including a processor and a memory for storing programs / instructions executable by the processor. When the processor is specifically implemented, it can perform the following steps according to the program / instructions: input the first constraint parameter and the first influencing parameter into the mechanical extension limit prediction model, and continuously adjust the first constraint parameter under the first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; input the second influencing parameter into the open hole extension limit prediction model, and output the open hole extension limit; input the second constraint parameter and the third influencing parameter into the hydraulic extension limit prediction model, and continuously adjust the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; input the mechanical extension limit, the open hole extension limit and the hydraulic extension limit into the comprehensive extension limit prediction model, and output the comprehensive extension limit.

[0151] In order to complete the above instructions more accurately, refer to Figure 10 As shown, the embodiment of this specification also provides another specific electronic device, wherein the electronic device includes a network communication port 1001, a processor 1002 and a memory 1003, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0152] The processor 1002 may be specifically configured to input the first constraint parameter and the first influencing parameter into a mechanical extension limit prediction model, and continuously adjust the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; input the second influencing parameter into a naked eye extension limit prediction model, and output the naked eye extension limit; input the second constraint parameter and the third influencing parameter into a hydraulic extension limit prediction model, and continuously adjust the second constraint parameter under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; input the mechanical extension limit, the naked eye extension limit, and the hydraulic extension limit into a comprehensive extension limit prediction model, and output the comprehensive extension limit;

[0153] The memory 1003 may be specifically used to store corresponding instruction programs.

[0154] In this embodiment, the network communication port 1001 can be a virtual port that is bound to different communication protocols, thereby being capable of sending or receiving different data. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. Furthermore, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM or CDMA; it can also be a Wi-Fi chip; or it can be a Bluetooth chip.

[0155] In this embodiment, the processor 1002 may be implemented in any suitable manner. For example, the processor may take the form of a microprocessor or a processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, an embedded microcontroller, etc. This specification is not intended to limit this.

[0156] In this embodiment, the memory 1003 may include multiple levels. In a digital system, anything that can store binary data can be a memory. In an integrated circuit, a circuit with a storage function that has no physical form is also called a memory, such as RAM, FIFO, etc. In a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0157] An embodiment of this specification also provides a computer storage medium based on the above-mentioned method for determining the comprehensive extension limit of horizontal well drilling, wherein the computer storage medium stores a computer program / instruction, which, when executed, implements: inputting a first constraint parameter and a first influencing parameter into a mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; inputting a second influencing parameter into a naked hole extension limit prediction model, and outputting the naked hole extension limit; inputting the second constraint parameter and a third influencing parameter into a hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; inputting the mechanical extension limit, the naked hole extension limit, and the hydraulic extension limit into a comprehensive extension limit prediction model, and outputting the comprehensive extension limit.

[0158] In this embodiment, the storage medium includes, but is not limited to, random access memory (RAM), read-only memory (ROM), cache, hard disk drive (HDD), or memory card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured in accordance with the standards specified by the communication protocol for network connection communication.

[0159] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer storage medium can be explained in comparison with other implementations and will not be repeated here.

[0160] Although this specification provides the method operation steps as described in the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the device or client product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. Words such as first and second are used to represent names and do not represent any particular order.

[0161] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0162] This specification may be described in the general context of computer-executable instructions, such as program modules, executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, and the like that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media, including storage devices.

[0163] Through the description of the above embodiments, it can be seen that those skilled in the art can clearly understand that this specification can be implemented by means of software plus the necessary general hardware platform. Based on this understanding, the technical solution of this specification can essentially be embodied in the form of a software product. This computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of this specification.

[0164] The various embodiments in this specification are described in a progressive manner. References to the common or similar parts of the various embodiments are sufficient. Each embodiment focuses on the differences from the other embodiments. This specification can be used in a variety of general-purpose or specialized computer system environments or configurations. For example, personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, and distributed computing environments that include any of the above systems or devices.

[0165] Although the present specification has been described with reference to the embodiments, persons skilled in the art will appreciate that there are many variations to the present specification without departing from the spirit of the present specification, and it is intended that the appended claims encompass such variations without departing from the spirit of the present specification.

Claims

1. A method for determining the comprehensive extension limit of horizontal well drilling, characterized in that: include: Inputting the first constraint parameter and the first influencing parameter into a mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; inputting the second influencing parameter into a naked eye extension limit prediction model and outputting a naked eye extension limit; Inputting the second constraint parameter and the third influencing parameter into a hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; The mechanical extension limit, open hole extension limit and hydraulic extension limit are input into the comprehensive extension limit prediction model to output the comprehensive extension limit.

2. The method according to claim 1, characterized in that The first constraint parameter includes at least one of the following: large hook load, turntable torque, drill bit drilling pressure, drill bit torque and equivalent stress on the tubing. The first constraint condition corresponding to the first constraint parameter includes at least one of the following: the large hook load is between the upper and lower limits of the rated hook load of the drilling rig, the turntable torque does not exceed the upper limit of the rated torque of the drilling rig, the drill bit drilling pressure when the tubing is lowered into the drill bit is not less than the lower limit of the rock breaking threshold drilling pressure and the drill bit torque is not less than the lower limit of the rock breaking threshold torque, the drill bit drilling pressure when the tubing is rotated and lifted is not less than the drill bit sticking resistance and the drill bit torque is not less than the drill bit sticking torque, the equivalent stress of the tubing does not exceed the allowable stress, the axial force at the tubing stuck point is equal to the mechanical resistance of the joint stuck, the torque of the tubing body does not exceed the maximum torque that the tubing body can withstand, and the torque of the tubing joint does not exceed the maximum torque that the tubing joint can withstand.

3. The method according to claim 1 or 2, characterized in that The step of continuously adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output includes: adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter, and outputting an initial target well depth based on the adjusted first constraint parameter and the first influencing parameter; Continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a first target well depth based on the second-adjusted first constraint parameter and the first influencing parameter; Determine whether the first target well depth is greater than the initial target well depth; if so, continue adjusting the first constraint parameter under the first constraint condition corresponding to the first constraint parameter, and output a second target well depth based on the three adjusted first constraint parameters and the first influencing parameter; Determine whether the second target well depth is greater than the first target well depth. If not, stop adjusting the first constraint parameter and use the first target well depth as the mechanical extension limit. The first target well depth is greater than the corresponding well depth threshold.

4. The method according to claim 1, wherein The second influencing parameters include the second influencing parameters of the annulus single-phase flow and the second influencing parameters of the annulus two-phase flow. The second influencing parameters of the annulus single-phase flow include at least one of the following: equivalent density of fracture pressure, drilling fluid density, vertical depth of wellbore, annulus pressure loss in the vertical section, annulus pressure loss in several inclined well sections, annulus friction coefficient, average flow rate of annulus drilling fluid, annulus outer diameter, annulus inner diameter and eccentricity coefficient. The second influencing parameters of the annulus two-phase flow include at least one of the following: equivalent density of fracture pressure, rock cuttings density, solid phase volume fraction, drilling fluid density, vertical depth of wellbore, annulus pressure loss in the vertical section, annulus pressure loss in several inclined well sections and horizontal section annulus pressure loss gradient; accordingly, the open hole extension limit prediction model includes the open hole extension limit model of the annulus single-phase flow and the open hole extension limit model of the annulus two-phase flow; accordingly, the open hole extension limit includes the open hole extension limit of the annulus single-phase flow and the open hole extension limit of the annulus two-phase flow.

5. The method according to claim 1, wherein The second constraint parameter includes at least one of the following: ground pressure and cuttings bed thickness. The second constraint condition corresponding to the second constraint parameter includes at least one of the following: the ground pressure does not exceed the upper limit of the rated pump pressure of the drilling pump, and the cuttings bed thickness does not exceed the upper limit of the allowable thickness.

6. The method according to claim 1 or 5, characterized in that The step of continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output includes: adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and outputting an initial well depth based on the adjusted second constraint parameter and the third influencing parameter; Continue adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter, and output the first well depth based on the second-adjusted second constraint parameter and the third influencing parameter; Determine whether the first well depth is greater than the initial well depth; if so, continue adjusting the second constraint parameter under a second constraint condition corresponding to the second constraint parameter, and output a second well depth based on the three adjusted second constraint parameters and the third influencing parameter; Determine whether the second well depth is greater than the first well depth. If so, stop adjusting the second constraint parameter and use the first well depth as the hydraulic extension limit, where the first well depth is greater than the corresponding well depth threshold.

7. The method according to claim 1, characterized in that The step of inputting the mechanical extension limit, the open hole extension limit, and the hydraulic extension limit into the comprehensive extension limit prediction model and outputting the comprehensive extension limit includes: The mechanical extension limit, open hole extension limit and hydraulic extension limit are input into the comprehensive extension limit prediction model. The mechanical extension limit, open hole extension limit and hydraulic extension limit are compared based on the comprehensive extension limit prediction model. The limit extension that is less than the preset comparison threshold is determined from the comparison results as the comprehensive extension limit and the comprehensive extension limit is output.

8. A device for determining the comprehensive extension limit of horizontal well drilling, characterized in that: include: a mechanical extension limit determination module, inputting the first constraint parameter and the first influencing parameter into the mechanical extension limit prediction model, and continuously adjusting the first constraint parameter under a first constraint condition corresponding to the first constraint parameter until the mechanical extension limit is output; a naked eye extension limit determination module, which inputs the second influencing parameter into the naked eye extension limit prediction model and outputs the naked eye extension limit; a hydraulic extension limit determination module, inputting the second constraint parameter and the third influencing parameter into the hydraulic extension limit prediction model, and continuously adjusting the second constraint parameter under the second constraint condition corresponding to the second constraint parameter until the hydraulic extension limit is output; The comprehensive extension limit determination module inputs the mechanical extension limit, the open hole extension limit and the hydraulic extension limit into the comprehensive extension limit prediction model and outputs the comprehensive extension limit.

9. A computer device comprising a memory, a processor, and a computer program / instruction stored in the memory, characterized in that: The processor executes the computer program / instructions to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images