Methods, devices, storage media, and computer equipment for adjusting well control operation parameters

Abstract

This invention discloses a method, apparatus, storage medium, and computer equipment for adjusting well control construction parameters. The method includes: constructing a target well using the pressure-back method to obtain construction parameters at the current moment; determining the fluid absorption index of the formation where the target well is located based on the construction parameters at the current moment, wherein the fluid absorption index characterizes the formation's ability to absorb fluid; determining the fracture parameters of the fractures in the formation where the target well is located at the current moment based on the fluid absorption index; and adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters for the next moment. This invention solves the technical problem of difficulty in obtaining the fracture parameters of the formation in the pressure-back section in real time during well control using the pressure-back method.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling and production technology, and more specifically, to a method, apparatus, storage medium, and computer equipment for adjusting well control parameters. Background Technology

[0002] For certain complex downhole accidents in fractured formations, conventional well control methods are generally insufficient to meet the well control requirements. In such cases, the pressure-back method can be used for well control. The pressure-back method involves injecting kill fluid into the wellbore. When the pressure difference between the bottom hole pressure and the formation exceeds a certain critical value, the gas and contaminated drilling fluid that have invaded the wellbore can be gradually forced back into the formation.

[0003] During well control, it is also necessary to obtain formation parameters, including permeability, porosity, fracture density, and fracture width. However, in the field, indirect methods are usually used for measurement, such as comprehensive logging, using data from acoustic logging, density logging, resistivity logging, etc., to obtain fracture parameters. For fractured formations, imaging logging has low accuracy and high cost, and it is impossible to provide real-time feedback on downhole formation parameters during the well control phase.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This invention provides a method, apparatus, storage medium, and computer equipment for adjusting well control construction parameters, in order to at least solve the technical problem of difficulty in obtaining the fracture parameters of the formation in the controlled-back section in real time during the well control process using the pushback method.

[0006] According to one aspect of the present invention, a method for adjusting well control construction parameters is provided, comprising: constructing a target well using the pressure-back method to obtain construction parameters at the current moment; determining the fluid absorption index of the formation where the target well is located based on the construction parameters at the current moment, wherein the fluid absorption index characterizes the formation's ability to absorb fluid; determining the fracture parameters of the fractures in the formation where the target well is located at the current moment based on the fluid absorption index; and adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters at the next moment.

[0007] Optionally, based on the construction parameters at the current moment, the fluid absorption index of the formation where the target well is located is determined, including: based on the construction parameters at the current moment, determining the drilling fluid leakage rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located; and determining the fluid absorption index based on the drilling fluid leakage rate, the bottom hole pressure, and the formation pressure.

[0008] Optionally, the drilling fluid leakage rate is determined based on the construction parameters at the current moment, including: given that the construction parameters at the current moment include the well kill time and the change in the mud pit, the drilling fluid leakage rate is obtained based on the change in the mud pit and the well kill time, wherein the well kill time is the duration from the start of construction to the current moment, and the mud pit is used to accumulate drilling fluid input to the target well and circulate it out from the target well.

[0009] Optionally, the bottom hole pressure of the target well is determined based on the construction parameters at the current moment, including: determining the boundary conditions that the fluid flows within the target well, given the construction parameters at the current moment, including the target well size, target well structure, drilling fluid rheology, and kill fluid rheology; and obtaining the bottom hole pressure based on the target well size, target well structure, drilling fluid rheology, kill fluid rheology, and a predetermined set of multiphase flow equations, under the constraints of the boundary conditions.

[0010] Optionally, based on the construction parameters at the current moment, the formation pressure of the formation where the target well is located is determined, including: if the construction parameters at the current moment include the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well, determining whether the drill bit is located at the bottom of the target well; if the drill bit is located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a first predetermined formula to obtain the formation pressure; if the drill bit is not located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a second predetermined formula to obtain the formation pressure.

[0011] Optionally, based on the fluid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current time are determined, including: obtaining the fracture parameters of the fractures in the target well based on the fluid absorption index and a pre-determined empirical formula, wherein the empirical formula is determined by: acquiring multiple sets of experimental data, wherein each set of experimental data includes the fluid absorption index and fracture parameters of the experimental well; and establishing the relationship between the fluid absorption index and fracture parameters of the experimental well based on the multiple sets of experimental data to obtain the empirical formula.

[0012] Optionally, based on the crack parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment, including at least one of the following: if the crack parameters exceed a predetermined first threshold, the construction parameters at the current moment are reduced to obtain the construction parameters at the next moment; if the crack parameters are between the first threshold and a predetermined second threshold, the construction parameters at the current moment are kept unchanged to obtain the construction parameters at the next moment; if the crack parameters are below the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0013] According to another aspect of the present invention, an apparatus for adjusting well control construction parameters is also provided, comprising: an acquisition module for constructing a target well using the pressure-back method and acquiring construction parameters at the current moment; a first determination module for determining the fluid absorption index of the formation where the target well is located based on the construction parameters at the current moment, wherein the fluid absorption index characterizes the formation's ability to absorb fluid; a second determination module for determining the fracture parameters of the fractures in the formation where the target well is located based on the fluid absorption index; and a third determination module for adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters at the next moment.

[0014] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is running, the device where the non-volatile storage medium is located executes any of the above-described methods for adjusting well control construction parameters.

[0015] According to another aspect of the present invention, a computer device is also provided, the computer device including a processor, the processor being configured to run a program, wherein the program, when running, executes any of the methods described above for adjusting well control construction parameters.

[0016] In this embodiment of the invention, a fluid absorption index is introduced to determine formation fracture parameters. The target well is drilled using the pushback method to obtain the current drilling parameters. Based on the current drilling parameters, the fluid absorption index of the formation where the target well is located is determined, where the fluid absorption index characterizes the formation's ability to absorb fluid. Based on the fluid absorption index, the fracture parameters in the formation where the target well is located are determined at the current moment. Based on the fracture parameters, the drilling parameters at the current moment are adjusted to determine the drilling parameters at the next moment. This achieves the goal of determining the fluid absorption index and thus the fracture parameters based on real-time drilling parameters, thereby realizing the technical effect of obtaining formation fracture parameters in real time. This solves the technical problem of difficulty in obtaining the fracture parameters of the pushed-back section of the formation in real time during the pushback method well control process. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 A hardware block diagram of a computer terminal for implementing a method for adjusting well control operation parameters is shown.

[0019] Figure 2 This is a flowchart illustrating a method for adjusting well control construction parameters according to an embodiment of the present invention;

[0020] Figure 3 This is a structural block diagram of a device for adjusting well control construction parameters according to an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] According to an embodiment of the present invention, a method for adjusting well control construction parameters is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0024] The method embodiment provided in Embodiment 1 of this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal for implementing a method of adjusting well control operation parameters is shown. Figure 1As shown, the computer terminal 10 may include one or more processors (shown as 102a, 102b, ..., 102n in the figure) (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0025] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be implemented wholly or partially as software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be wholly or partially integrated into any other element in the computer terminal 10. As involved in the embodiments of this application, the data processing circuits serve as processor control (e.g., selection of a variable resistor termination path connected to an interface).

[0026] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the method for adjusting well control construction parameters in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the method for adjusting well control construction parameters of the aforementioned application. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0027] The display may be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10.

[0028] Pressure-back well control is a technique that controls bottom hole pressure by injecting pressurized fluid into oil or gas wells. It is commonly used to address issues such as abnormally high bottom hole pressure, blowouts, and well control problems. In pressure-back well control, a high-density pressurized fluid (such as drilling mud) is pumped in to resist abnormally high pressure at the bottom hole, gradually pushing back gas and contaminated drilling fluid that have entered the wellbore into the formation. This method effectively controls bottom hole pressure, prevents blowouts, and ensures wellhead safety.

[0029] Figure 2 This is a flowchart illustrating a method for adjusting well control construction parameters according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes the following steps:

[0030] Step S202: The target well is constructed using the pressure-back method to obtain the construction parameters at the current moment.

[0031] During the injection of fluid into the target well using the pressure-back method, the formation conditions change as more fluid is injected. The well-killing parameters can be adjusted in real time based on these formation conditions, ensuring precise and efficient operation. In this step, since the formation conditions of the target well are directly affected by the well-killing parameters, the current formation conditions can be obtained. Based on these parameters, the current formation conditions can be determined, and then the parameters can be adjusted to determine the parameters for the next time step.

[0032] Step S204: Determine the liquid absorption index of the formation where the target well is located based on the construction parameters at the current time. The liquid absorption index represents the formation's ability to absorb liquid.

[0033] Step S206: Determine the fracture parameters of the fractures in the formation where the target well is located at the current moment based on the fluid absorption index.

[0034] In related technologies, real-time feedback of formation fracture parameters acquired through well logging during construction is not possible. In the two steps mentioned above, construction parameters are relatively easy to obtain, and fracture parameters can be derived from these parameters. Since the formation's ability to absorb gas and contaminated drilling fluid in the pushed-back section of the target well determines the success of the push-back well control method, a formation fluid absorption index can be introduced to make the fracture parameters obtained through construction parameters more accurate. The fluid absorption index is determined by the construction parameters, and then the formation fracture parameters are determined by the fluid absorption index. Specifically, the magnitude of the formation fluid absorption index reflects the physical properties of the formation, so fracture parameters can be determined through the fluid absorption index. A lower fluid absorption index indicates a weaker ability of the formation to absorb fluids, which to some extent suggests fewer or shallower fractures in the formation.

[0035] Step S208: Adjust the construction parameters at the current moment based on the crack parameters, and determine the construction parameters at the next moment.

[0036] In this step, the construction parameters for the pressure-back method of well control can be adjusted based on the fracture parameters. If the fracture parameters are small, the required pump pressure will be higher for the same pressure-back rate and kill fluid discharge rate, which may easily exceed the pressure tolerance of the surface equipment. Therefore, the suitability of the pressure-back method for well control, and whether it will fracture the reservoir and cause more serious accidents, needs to be reconsidered. When increasing the kill fluid discharge rate during the pressure-back method, the fractures in the formation also widen. This may lead to permanent fractures in a certain section, and severe leakage may easily occur during well control. In this case, the discharge rate should be adjusted appropriately. After the pressure-back operation is completed, if the fractures generated during the pressure-back process cannot be closed again, plugging treatment is required to improve the formation's pressure tolerance before drilling can continue.

[0037] Through the above steps, the goal of determining the fluid absorption index and thus the fracture parameters can be achieved based on real-time construction parameters. This realizes the technical effect of obtaining formation fracture parameters in real time, thereby solving the technical problem of difficulty in obtaining the fracture parameters of the pushed-back section in real time during the push-back well control process.

[0038] As an optional embodiment, the fluid absorption index of the formation where the target well is located is determined based on the construction parameters at the current moment, including: determining the drilling fluid leakage rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located based on the construction parameters at the current moment; and determining the fluid absorption index based on the drilling fluid leakage rate, the bottom hole pressure, and the formation pressure.

[0039] Optionally, a fluid uptake index can be introduced to reflect the formation's fluid uptake capacity. The fluid uptake index is the amount of drilling fluid absorbed by the formation per unit leakage pressure differential. A higher fluid uptake index indicates better permeability of fractures in the formation, making it more suitable for the pressure-back method of well control. The fluid uptake index n can be determined using the following formula:

[0040]

[0041] The unit of the liquid absorption index n is m. 3 ·MPa -1 Q 漏 The drilling fluid loss rate, in meters per second (m³). 3 ·h -1 ;P w P represents the bottom hole pressure, measured in MPa. e This represents formation pressure, expressed in MPa.

[0042] As an optional embodiment, determining the drilling fluid leakage rate based on the construction parameters at the current moment includes: when the construction parameters at the current moment include the well kill time and the change in the mud pit, obtaining the drilling fluid leakage rate based on the change in the mud pit and the well kill time, wherein the well kill time is the duration from the start of construction to the current moment, and the mud pit is used to accumulate drilling fluid input to the target well and circulate it out from the target well.

[0043] Optionally, a mud pit is installed in the pressure-back method for well control to store drilling fluid circulated from the well. During well control, mud is injected into the wellhead and then circulated back to the mud pit through the wellbore. The mud pit can hold a large amount of mud to ensure continuous circulation during well control. It should be noted that during well control, both kill fluid and drilling fluid are usually used simultaneously. Specifically, drilling fluid is mainly used to create a certain bottomhole pressure to prevent dangerous situations such as bottomhole outbursts and blowouts; while kill fluid is a special liquid injected into the bottom of the well during bottomhole isolation operations. Kill fluid usually has high density and viscosity to create a certain bottomhole isolation pressure and has good sealing performance, effectively controlling the bottomhole pressure and bottomhole conditions. The drilling fluid leakage rate mentioned in this optional embodiment can be determined by the amount of fluid reduced in the mud pit. Based on the change in the mud pit and the duration from the start of construction to the current time, the rate of drilling fluid leakage into the formation can be determined by the following formula:

[0044]

[0045] In the formula, V represents the change in the mud pit, with the unit being m. -3 T represents the well control time, measured in seconds.

[0046] As an optional embodiment, determining the bottom hole pressure of the target well based on the construction parameters at the current moment includes: determining the boundary conditions that the fluid flows within the target well, given that the construction parameters at the current moment include the target well size, target well structure, drilling fluid rheology, and kill fluid rheology; and obtaining the bottom hole pressure based on the target well size, target well structure, drilling fluid rheology, kill fluid rheology, and a predetermined set of multiphase flow equations, under the constraints of the boundary conditions.

[0047] Optionally, during the pressure-back method for well control, the bottom hole pressure can be calculated using a set of multiphase flow equations in the wellbore. First, a set of multiphase flow equations can be established using principles of fluid mechanics and the mass conservation equation to determine the boundary conditions obeyed by the fluid flowing within the target well. Then, parameters such as the target well size, target well structure, drilling fluid rheology, and kill fluid rheology can be substituted into the multiphase flow equations. Combined with the boundary conditions under actual operating conditions, the equations are solved to calculate the pressure-time curves at different wellbore locations, thus obtaining the bottom hole pressure.

[0048] It is important to note that calculating bottomhole pressure is a complex process involving the interaction of multiple parameters and flow phenomena. Therefore, before performing the calculations, it is essential to carefully consider various factors and select appropriate physical equations and calculation methods.

[0049] As an optional embodiment, determining the formation pressure of the formation where the target well is located based on the construction parameters at the current moment includes: determining whether the drill bit is located at the bottom of the target well if the construction parameters at the current moment include the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well; if the drill bit is located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a first predetermined formula to obtain the formation pressure; if the drill bit is not located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a second predetermined formula to obtain the formation pressure.

[0050] Optionally, during wellhead extraction, gas intrusion may be detected, and well shut-in measures can be taken in a timely manner. After the wellhead pressure gradually stabilizes, data such as the standpipe pressure at the time of well shut-in can be obtained. The pressure at the drill bit can be determined based on the well shut-in standpipe pressure and the drilling fluid column pressure in the drill string, thereby determining the formation pressure.

[0051] Specifically, the formation pressure can be determined in two cases based on the drill bit's location. When the drill bit is at the bottom of the well, the formation pressure P can be determined using the following formula. e :

[0052] P e =P d +ρ d gH,

[0053] In the formula, P d ρ is the riser pressure, in MPa. d The density of the previously input drilling fluid, in g·cm³. -3 H is the thickness of the leakage layer, in meters (m); g is the acceleration due to gravity, in meters per second (m·s). -2 .

[0054] When the drill bit is not at the bottom of the well, the formation pressure P can be determined using the following formula. e :

[0055] P e =P d +ρ d gh d +ρ m g(Hh d ),

[0056] In the formula, h d ρ is the length of the drill string inside the wellbore, in meters (m). m This refers to the density of the fluid in the section of the well from the drill bit to the bottom of the well, expressed in g·cm³. -3 The density ρ of the fluid in the section from the drill bit to the bottom of the well can be calculated using the following formula based on the gas content of that section. m :

[0057] ρ m =E g ρ g +(1-E g )ρ d ,

[0058] Where, ρ g Gas density, also known as the density of the gas at the bottom of the well, E g Gas content refers to the proportion of gas in a well section.

[0059] As an optional embodiment, the fracture parameters of the fractures in the formation where the target well is located at the current time are determined based on the fluid absorption index, including: obtaining the fracture parameters of the fractures in the target well based on the fluid absorption index and a pre-determined empirical formula, wherein the empirical formula is determined by: acquiring multiple sets of experimental data, wherein each set of experimental data includes the fluid absorption index and fracture parameters of the experimental well; and establishing the relationship between the fluid absorption index and fracture parameters of the experimental well based on the multiple sets of experimental data to obtain the empirical formula.

[0060] Optionally, experimental or numerical simulation studies can be conducted on the suction index under different fracture parameters and drilling fluid rheological properties. Under experimental conditions, the bottom hole pressure and drilling fluid leakage rate can be measured under different fracture parameters and drilling fluid rheological properties (given formation pressure). Based on the definition of the suction index, the corresponding value of the suction index can be calculated, establishing an empirical relationship between the suction index and fracture parameters (fracture density and width). In practical applications, the fracture parameters corresponding to the suction index can be determined simply by substituting the suction index into the predetermined empirical relationship.

[0061] As an optional embodiment, the construction parameters at the current moment are adjusted based on the crack parameters to determine the construction parameters at the next moment, including at least one of the following: if the crack parameters exceed a predetermined first threshold, the construction parameters at the current moment are reduced to obtain the construction parameters at the next moment; if the crack parameters are between the first threshold and a predetermined second threshold, the construction parameters at the current moment are kept unchanged to obtain the construction parameters at the next moment; if the crack parameters are below the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0062] Optionally, the construction parameters for the pressure-back method of well control can be adjusted based on fracture parameters. If the fracture parameters are small, below the second threshold, the construction parameters at the current moment need to be increased for the same pressure-back rate and well control fluid discharge. However, the increased pump pressure is very high, which may easily exceed the pressure bearing capacity of the surface equipment. The applicability of the pressure-back method for well control and whether it will fracture the reservoir and cause more serious accidents need to be reconsidered. If the fracture parameters are suitable, between the first threshold and the predetermined second threshold, the construction parameters at the current moment can remain unchanged. If the fracture parameters are large, exceeding the first threshold, it may cause permanent fractures in a certain section, and serious leakage may easily occur during well control. In this case, the construction parameters at the current moment should be appropriately reduced. After the pressure-back operation is completed, if the fractures generated during the pressure-back process cannot be closed again, plugging treatment is required to improve the formation's pressure bearing capacity before drilling can continue.

[0063] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0064] Through the above description of the embodiments, those skilled in the art can clearly understand that the method for adjusting well control construction parameters according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0065] According to an embodiment of the present invention, an apparatus for adjusting well control parameters for implementing the above-described method of adjusting well control parameters is also provided. Figure 3 This is a structural block diagram of a device for adjusting well control construction parameters according to an embodiment of the present invention, such as... Figure 3 As shown, the device for adjusting well control construction parameters includes: an acquisition module 32, a first determination module 34, a second determination module 36, and a third determination module 38. The device for adjusting well control construction parameters will be described below.

[0066] The acquisition module 32 is used to acquire the construction parameters at the current moment when the target well is constructed using the pressure return method.

[0067] The first determining module 34, connected to the acquiring module 32, is used to determine the liquid absorption index of the formation where the target well is located based on the construction parameters at the current time, wherein the liquid absorption index characterizes the formation's ability to absorb liquid.

[0068] The second determining module 36, connected to the first determining module 34, is used to determine the fracture parameters of the fractures in the formation where the target well is located at the current moment based on the liquid absorption index.

[0069] The third determining module 38, connected to the second determining module 36, is used to adjust the construction parameters at the current moment based on the crack parameters, and to determine the construction parameters at the next moment.

[0070] It should be noted that the aforementioned acquisition module 32, first determination module 34, second determination module 36, and third determination module 38 correspond to steps S202 to S208 in the embodiments. Multiple modules implement the same instances and application scenarios as their corresponding steps, but are not limited to the content disclosed in the above embodiments. It should also be noted that the aforementioned modules, as part of the device, can run on the computer terminal 10 provided in the embodiments.

[0071] Embodiments of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0072] The memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the method and apparatus for adjusting well control construction parameters in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, thereby realizing the aforementioned method for adjusting well control construction parameters. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0073] The processor can access the information and application programs stored in the memory via the transmission device to perform the following steps: constructing the target well using the pressure-back method to obtain the construction parameters at the current moment; determining the fluid absorption index of the formation where the target well is located based on the construction parameters at the current moment, where the fluid absorption index characterizes the formation's ability to absorb fluid; determining the fracture parameters of the fractures in the formation where the target well is located based on the fluid absorption index; adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters for the next moment.

[0074] Optionally, based on the construction parameters at the current moment, the fluid absorption index of the formation where the target well is located is determined, including: based on the construction parameters at the current moment, determining the drilling fluid leakage rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located; and determining the fluid absorption index based on the drilling fluid leakage rate, the bottom hole pressure, and the formation pressure.

[0075] Optionally, the drilling fluid leakage rate is determined based on the construction parameters at the current moment, including: given that the construction parameters at the current moment include the well kill time and the change in the mud pit, the drilling fluid leakage rate is obtained based on the change in the mud pit and the well kill time, wherein the well kill time is the duration from the start of construction to the current moment, and the mud pit is used to accumulate drilling fluid input to the target well and circulate it out from the target well.

[0076] Optionally, the bottom hole pressure of the target well is determined based on the construction parameters at the current moment, including: determining the boundary conditions that the fluid flows within the target well, given the construction parameters at the current moment, including the target well size, target well structure, drilling fluid rheology, and kill fluid rheology; and obtaining the bottom hole pressure based on the target well size, target well structure, drilling fluid rheology, kill fluid rheology, and a predetermined set of multiphase flow equations, under the constraints of the boundary conditions.

[0077] Optionally, based on the construction parameters at the current moment, the formation pressure of the formation where the target well is located is determined, including: if the construction parameters at the current moment include the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well, determining whether the drill bit is located at the bottom of the target well; if the drill bit is located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a first predetermined formula to obtain the formation pressure; if the drill bit is not located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a second predetermined formula to obtain the formation pressure.

[0078] Optionally, based on the fluid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current time are determined, including: obtaining the fracture parameters of the fractures in the target well based on the fluid absorption index and a pre-determined empirical formula, wherein the empirical formula is determined by: acquiring multiple sets of experimental data, wherein each set of experimental data includes the fluid absorption index and fracture parameters of the experimental well; and establishing the relationship between the fluid absorption index and fracture parameters of the experimental well based on the multiple sets of experimental data to obtain the empirical formula.

[0079] Optionally, based on the crack parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment, including at least one of the following: if the crack parameters exceed a predetermined first threshold, the construction parameters at the current moment are reduced to obtain the construction parameters at the next moment; if the crack parameters are between the first threshold and a predetermined second threshold, the construction parameters at the current moment are kept unchanged to obtain the construction parameters at the next moment; if the crack parameters are below the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0080] This invention provides a scheme for adjusting well control construction parameters. A fluid absorption index is introduced to determine formation fracture parameters. The target well is constructed using the pushback method to obtain the construction parameters at the current moment. Based on the construction parameters at the current moment, the fluid absorption index of the formation where the target well is located is determined, where the fluid absorption index characterizes the formation's ability to absorb fluids. Based on the fluid absorption index, the fracture parameters in the formation where the target well is located are determined at the current moment. Based on the fracture parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment. This achieves the goal of determining the fluid absorption index and thus the fracture parameters based on real-time construction parameters, thereby realizing the technical effect of real-time acquisition of formation fracture parameters. This solves the technical problem of difficulty in real-time acquisition of fracture parameters in the pushed-back section during well control using the pushback method.

[0081] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a non-volatile storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0082] Embodiments of the present invention also provide a non-volatile storage medium. Optionally, in this embodiment, the aforementioned non-volatile storage medium can be used to store the program code executed by the method for adjusting well control construction parameters provided in the above embodiments.

[0083] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: drilling the target well using the pressure-back method to obtain the drilling parameters at the current moment; determining the fluid absorption index of the formation where the target well is located based on the drilling parameters at the current moment, wherein the fluid absorption index characterizes the formation's ability to absorb fluid; determining the fracture parameters of the fractures in the formation where the target well is located based on the fluid absorption index; and adjusting the drilling parameters at the current moment based on the fracture parameters to determine the drilling parameters at the next moment.

[0085] Optionally, based on the construction parameters at the current moment, the fluid absorption index of the formation where the target well is located is determined, including: based on the construction parameters at the current moment, determining the drilling fluid leakage rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located; and determining the fluid absorption index based on the drilling fluid leakage rate, the bottom hole pressure, and the formation pressure.

[0086] Optionally, the drilling fluid leakage rate is determined based on the construction parameters at the current moment, including: given that the construction parameters at the current moment include the well kill time and the change in the mud pit, the drilling fluid leakage rate is obtained based on the change in the mud pit and the well kill time, wherein the well kill time is the duration from the start of construction to the current moment, and the mud pit is used to accumulate drilling fluid input to the target well and circulate it out from the target well.

[0087] Optionally, the bottom hole pressure of the target well is determined based on the construction parameters at the current moment, including: determining the boundary conditions that the fluid flows within the target well, given the construction parameters at the current moment, including the target well size, target well structure, drilling fluid rheology, and kill fluid rheology; and obtaining the bottom hole pressure based on the target well size, target well structure, drilling fluid rheology, kill fluid rheology, and a predetermined set of multiphase flow equations, under the constraints of the boundary conditions.

[0088] Optionally, based on the construction parameters at the current moment, the formation pressure of the formation where the target well is located is determined, including: if the construction parameters at the current moment include the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well, determining whether the drill bit is located at the bottom of the target well; if the drill bit is located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a first predetermined formula to obtain the formation pressure; if the drill bit is not located at the bottom of the target well, substituting the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well into a second predetermined formula to obtain the formation pressure.

[0089] Optionally, based on the fluid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current time are determined, including: obtaining the fracture parameters of the fractures in the target well based on the fluid absorption index and a pre-determined empirical formula, wherein the empirical formula is determined by: acquiring multiple sets of experimental data, wherein each set of experimental data includes the fluid absorption index and fracture parameters of the experimental well; and establishing the relationship between the fluid absorption index and fracture parameters of the experimental well based on the multiple sets of experimental data to obtain the empirical formula.

[0090] Optionally, based on the crack parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment, including at least one of the following: if the crack parameters exceed a predetermined first threshold, the construction parameters at the current moment are reduced to obtain the construction parameters at the next moment; if the crack parameters are between the first threshold and a predetermined second threshold, the construction parameters at the current moment are kept unchanged to obtain the construction parameters at the next moment; if the crack parameters are below the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0091] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0092] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0094] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0095] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0096] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0097] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for adjusting well control construction parameters, characterized in that, include: The pressure-back method was used to construct the target well and obtain the construction parameters at the current moment. Based on the construction parameters at the current moment, the fluid absorption index of the formation where the target well is located is determined, wherein the fluid absorption index characterizes the formation's ability to absorb fluid, and the fluid absorption index refers to the amount of drilling fluid absorbed by the formation per unit leakage pressure difference; Based on the fluid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current time are determined, wherein the fluid absorption index is positively correlated with the permeability of the fractures in the formation; Based on the crack parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment. The step of adjusting the construction parameters at the current moment based on the crack parameters to determine the construction parameters at the next moment includes at least one of the following: if the crack parameters exceed a predetermined first threshold, decreasing the construction parameters at the current moment to obtain the construction parameters at the next moment; if the crack parameters are between the first threshold and a predetermined second threshold, keeping the construction parameters at the current moment unchanged to obtain the construction parameters at the next moment; if the crack parameters are below the second threshold, increasing the construction parameters at the current moment to obtain the construction parameters at the next moment.

2. The method according to claim 1, characterized in that, The step of determining the fluid absorption index of the formation where the target well is located based on the construction parameters at the current moment includes: Based on the construction parameters at the current moment, determine the drilling fluid leakage rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located; The fluid absorption index is determined based on the drilling fluid loss rate, the bottom hole pressure, and the formation pressure.

3. The method according to claim 2, characterized in that, Determining the drilling fluid loss rate based on the construction parameters at the current moment includes: Given that the construction parameters at the current moment include the well kill time and the change in the mud pit, the leakage rate of the drilling fluid is obtained based on the change in the mud pit and the well kill time. The well kill time is the duration from the start of construction to the current moment, and the mud pit is used to accumulate drilling fluid input to the target well and circulated out of the target well.

4. The method according to claim 2, characterized in that, Determining the bottom hole pressure of the target well based on the construction parameters at the current moment includes: Given that the construction parameters at the current moment include the target well size, the target well structure, drilling fluid rheology, and kill fluid rheology, determine the boundary conditions that the fluid must obey to flow within the target well. Under the constraints of the boundary conditions, the bottom hole pressure is obtained based on the target well size, the target well structure, the rheology of the drilling fluid and the rheology of the kill fluid, and a predetermined set of multiphase flow equations.

5. The method according to claim 2, characterized in that, The step of determining the formation pressure of the formation where the target well is located based on the construction parameters at the current moment includes: Given that the construction parameters at the current moment include the riser pressure, the density of the drilling fluid, and the length of the drill string in the target well, determine whether the drill bit is located at the bottom of the target well; With the drill bit at the bottom of the target well, the formation pressure is obtained by substituting the standpipe pressure, the density of the drilling fluid, and the length of the drill string in the target well into a first predetermined formula. When the drill bit is not at the bottom of the target well, the standpipe pressure, the density of the drilling fluid, and the length of the drill string in the target well are substituted into a second predetermined formula to obtain the formation pressure.

6. The method according to claim 1, characterized in that, The step of determining the fracture parameters of the formation where the target well is located at the current moment based on the liquid absorption index includes: Based on the fluid absorption index and a predetermined empirical formula, the fracture parameters of the fractures in the target well are obtained. The empirical formula is determined as follows: multiple sets of experimental data are obtained, each set of experimental data including the fluid absorption index of the experimental well and the fracture parameters of the experimental well; based on the multiple sets of experimental data, the relationship between the fluid absorption index of the experimental well and the fracture parameters of the experimental well is established to obtain the empirical formula.

7. A device for adjusting well control operation parameters, characterized in that, include: The acquisition module is used to acquire the construction parameters at the current moment when the target well is constructed using the pressure-back method. The first determining module is used to determine the fluid absorption index of the formation where the target well is located based on the construction parameters at the current time. The fluid absorption index characterizes the formation's ability to absorb fluid, and the fluid absorption index refers to the amount of drilling fluid absorbed by the formation per unit leakage pressure difference. The second determining module is used to determine the fracture parameters of the fractures in the formation where the target well is located at the current time based on the liquid absorption index, wherein the liquid absorption index is positively correlated with the permeability of the fractures in the formation. The third determining module is used to adjust the construction parameters at the current moment based on the crack parameters, and determine the construction parameters at the next moment. The third determining module is further configured to: reduce the construction parameters at the current time when the crack parameters exceed a predetermined first threshold, to obtain the construction parameters at the next time; keep the construction parameters at the current time unchanged when the crack parameters are between the first threshold and a predetermined second threshold, to obtain the construction parameters at the next time; and increase the construction parameters at the current time when the crack parameters are below the second threshold, to obtain the construction parameters at the next time.

8. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored program, wherein, when the program is executed, the device containing the non-volatile storage medium is controlled to perform the method for adjusting well control construction parameters as described in any one of claims 1 to 6.

9. A computer device, characterized in that, include: Memory and processor The memory stores computer programs; The processor is configured to execute a computer program stored in the memory, wherein when the computer program is executed, the processor performs the method for adjusting well control construction parameters as described in any one of claims 1 to 6.

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