Method and device for adjusting well killing construction parameters, storage medium and computer equipment

Abstract

The invention discloses a method and device for adjusting well killing construction parameters, a storage medium and computer equipment. The method comprises the following steps: constructing a target well by adopting a press-back method, and obtaining construction parameters at the current moment; according to the construction parameters at the current moment, the liquid absorption index of the stratum where the target well is located is determined, and the liquid absorption index represents the liquid absorption capacity of the stratum; according to the liquid absorption index, crack parameters of cracks in the stratum where the target well is located at the current moment are determined; and according to the crack parameters, the construction parameters at the current moment are adjusted, and the construction parameters at the next moment of the current moment are determined. The technical problem that the fracture parameters of the stratum of the pressed-back interval are difficult to obtain in real time in the well killing process of the pressing-back method is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling and production, and in particular to a method, a device, a storage medium and a computer device for adjusting well killing construction parameters. Background Art

[0002] For some complex downhole accidents in fractured formations, conventional well killing methods generally cannot meet the well killing requirements, and the pressure-back method can be used for well killing. The pressure-back method uses the method of squeezing well killing fluid into the wellbore. When the pressure difference between the bottom hole pressure and the formation is greater than a certain critical value, the gas invading the wellbore and the contaminated drilling fluid can be gradually pressed back into the formation.

[0003] During the well killing process, formation parameters including permeability, porosity, fracture density, fracture width, etc. need to be mastered. However, indirect methods are usually used for measurement on site. Fracture parameters are obtained through comprehensive logging, using acoustic, density, resistivity and other logging data. For fractured formations, imaging logging is not accurate and the logging cost is high. During the well killing process, it is impossible to provide real-time feedback on downhole formation parameters.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, storage medium and computer equipment for adjusting well-killing construction parameters, so as to at least solve the technical problem that it is difficult to obtain the fracture parameters of the formation of the pressed-back layer section in real time during the well-killing process by the press-back method.

[0006] According to one aspect of an embodiment of the present invention, a method for adjusting well pressure construction parameters is provided, comprising: constructing a target well using a pressure-back method to obtain construction parameters at a current moment; determining a liquid absorption index of a formation in which the target well is located based on the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; determining fracture parameters of fractures in the formation in which the target well is located at the current moment based on the liquid absorption index; adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters at the next moment after the current moment.

[0007] Optionally, the liquid 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 leakage rate of the drilling fluid, 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; determining the liquid absorption index based on the leakage rate of the drilling fluid, the bottom hole pressure and the formation pressure.

[0008] Optionally, the leakage rate of the drilling fluid is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the well killing time and the change in the mud pool, the leakage rate of the drilling fluid is obtained based on the change in the mud pool and the well killing time, wherein the well killing time is the time from the start of construction to the current moment, and the mud pool is used to accumulate the drilling fluid input into the target well and circulated 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: when the construction parameters at the current moment include the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, determining the boundary conditions obeyed by the flow of the fluid in the target well; under the constraints of the boundary conditions, the bottom hole pressure is obtained based on the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, and a predetermined set of multiphase flow equations.

[0010] Optionally, the formation pressure of the formation in which the target well is located is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the standpipe pressure, the density of the drilling fluid and the length of the drill string in the target well, judging whether the drill bit is located at the bottom of the target well; when the drill bit is located at the bottom of the target well, 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 to obtain the formation pressure; when the drill bit is not located at the bottom of the target well, substituting the standpipe 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 liquid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current moment are determined, including: based on the liquid absorption index and a predetermined empirical formula, the fracture parameters of the fractures in the target well are obtained, wherein the empirical formula is determined in the following manner: obtaining multiple sets of experimental data, wherein each set of experimental data in the multiple sets of experimental data includes the liquid absorption index of the experimental well and the fracture parameters of the experimental well; based on the multiple sets of experimental data, establishing a relationship between the liquid absorption index of the experimental well and the fracture parameters of the experimental well to obtain the empirical formula.

[0012] Optionally, the construction parameters at the current moment are adjusted according to the crack parameters to determine the construction parameters at the next moment, including at least one of the following: when 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; when 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; when the crack parameters are lower than 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 an embodiment of the present invention, a device for adjusting well pressure construction parameters is also provided, including: an acquisition module, used to construct a target well using a pressure-back method to obtain the construction parameters at the current moment; a first determination module, used to determine the liquid absorption index of the formation where the target well is located according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; a second determination module, used to determine the fracture parameters of the fractures in the formation where the target well is located at the current moment according to the liquid absorption index; a third determination module, used to adjust the construction parameters at the current moment according to the fracture parameters, and determine the construction parameters at the next moment after the current moment.

[0014] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is 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 is controlled to execute any one of the above methods for adjusting well pressure construction parameters.

[0015] According to another aspect of the embodiments of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above methods for adjusting well killing construction parameters is executed.

[0016] In an embodiment of the present invention, a liquid absorption index is introduced to determine the fracture parameters of the formation, and the construction parameters at the current moment are obtained by constructing a target well using the pressure-back method; the liquid absorption index of the formation where the target well is located is determined according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; the fracture parameters of the fractures in the formation where the target well is located at the current moment are determined according to the liquid absorption index; according to the fracture parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment after the current moment, thereby achieving the purpose of determining the liquid absorption index and then determining the fracture parameters according to the real-time construction parameters, thereby realizing the technical effect of obtaining the fracture parameters of the formation in real time, thereby solving the technical problem that it is difficult to obtain the fracture parameters of the formation of the pressed back layer section in real time during the pressure-back method well pressure reduction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a computer terminal for implementing a method for adjusting well killing construction parameters is shown;

[0019] Figure 2 is a flow chart of a method for adjusting well killing construction parameters provided in accordance with an embodiment of the present invention;

[0020] Figure 3 It is a structural block diagram of a device for adjusting well killing construction parameters provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0024] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 The hardware structure block diagram of a computer terminal for implementing the method for adjusting well killing construction parameters is shown. Figure 1As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), 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 the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0025] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal 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 the well-killing construction parameters in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the method for adjusting the well-killing construction parameters of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

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

[0028] The pressure-back well killing method is a technology that controls the bottom hole pressure by injecting pressure liquid into the oil well or gas well. It is usually used to solve the problems of abnormal increase in bottom hole pressure, blowout and well control. In the pressure-back well killing method, high-density pressure liquid (such as mud) is pumped in to resist the abnormal high pressure at the bottom of the well, and the gas invading the wellbore and the contaminated drilling fluid are gradually pressed back into the formation. This method can effectively control the bottom hole pressure, prevent the occurrence of blowout accidents, and ensure the safety of the wellhead.

[0029] Figure 2 FIG. 1 is a flow chart of a method for adjusting well killing construction parameters according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

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

[0031] In the process of constructing the target well by the pressure-back method, as more and more liquid is pressed in, the conditions of the formation where the target well is located will change. The construction parameters of the well-killing can be adjusted in real time according to the conditions of the formation, so that the construction can be carried out accurately and efficiently. In this step, since the conditions of the formation where the target well is located are directly affected by the construction parameters of the well-killing, the construction parameters at the current moment can be obtained, and the formation conditions at the current moment can be determined according to the construction parameters at the current moment, and then the construction parameters can be adjusted according to the formation conditions at the current moment to determine the construction parameters at the next moment of the current moment.

[0032] Step S204, determining the liquid absorption index of the formation where the target well is located according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid.

[0033] Step S206, determining the fracture parameters of the fractures in the formation where the target well is located at the current moment according to the liquid absorption index.

[0034] In the related art, real-time feedback cannot be achieved by collecting the fracture parameters of the formation by logging during the construction process. In the above two steps, the construction parameters can be obtained relatively conveniently, and the fracture parameters can be obtained through the construction parameters. Since the absorption capacity of the formation in the pressed back layer section in the target well for gas and contaminated drilling fluid determines whether the well pressure can be successfully carried out by the pressure back method, in order to make the fracture parameters obtained by the construction parameters more accurate, the liquid absorption index of the formation can be introduced, and the liquid absorption index of the formation can be determined by the construction parameters, and then the fracture parameters of the formation can be determined by the liquid absorption index. Specifically, the size of the liquid absorption index of the formation reflects the physical properties of the formation, so the fracture parameters of the formation can be determined by the liquid absorption index. A smaller liquid absorption index indicates that the formation has a weaker ability to absorb liquid, which to a certain extent indicates that there are fewer or shallower cracks in the formation.

[0035] Step S208, adjusting the construction parameters at the current moment according to the crack parameters, and determining the construction parameters at the next moment after the current moment.

[0036] In this step, the construction parameters of the pressure-back well killing method can be adjusted according to the fracture parameters. If the fracture parameters are small, the higher the pump pressure required under the same pressure-back speed and well killing fluid displacement, the more likely it is to exceed the bearing pressure of the ground equipment. It is necessary to reconsider whether the pressure-back well killing method is applicable and whether it will cause reservoir fracturing and more serious accidents. When the well killing fluid displacement is increased during the pressure-back well killing process, the cracks in the formation will also expand. At this time, a certain layer section may be leaked to cause permanent cracks. Serious leakage is likely to occur while killing the well. At this time, the displacement should be appropriately adjusted and the pressure-back operation is completed. If the cracks generated during the pressure-back process cannot be closed again, plugging treatment is required to improve the bearing capacity of the formation before drilling can continue.

[0037] Through the above steps, the purpose of determining the liquid absorption index and then the fracture parameters according to the real-time construction parameters can be achieved, thereby realizing the technical effect of obtaining the fracture parameters of the formation in real time, and thus solving the technical problem that it is difficult to obtain the fracture parameters of the formation in the pressed back layer section in real time during the well pressure reduction method.

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

[0039] Optionally, a liquid absorption index can be introduced to reflect the liquid absorption capacity of the formation. The liquid absorption index is the amount of drilling fluid absorbed by the formation under a unit loss pressure difference. The larger the liquid absorption index, the better the permeability of the fractures in the formation, and the more suitable it is to use the pressure back method to kill the well. The liquid absorption index n can be determined by the following formula:

[0040]

[0041] Among them, the unit of liquid absorption index n is m 3 MPa -1 ;Q 漏 is the loss rate of drilling fluid, in m 3 ·h -1 ;P w is the bottom hole pressure, in MPa; P e is the formation pressure, in MPa.

[0042] As an optional embodiment, the leakage rate of drilling fluid is determined according to the construction parameters at the current moment, including: when the construction parameters at the current moment include the well killing time and the change in the mud pool, the leakage rate of drilling fluid is obtained according to the change in the mud pool and the well killing time, wherein the well killing time is the time from the start time of construction to the current moment, and the mud pool is used to accumulate drilling fluid input into the target well and circulated out from the target well.

[0043] Optionally, a mud pool is set up in the pressure-back well killing method, and the mud pool is used to store the drilling fluid circulated from the well. During the well killing process, mud is injected into the wellhead and then circulated into the mud pool through the wellbore. The mud pool can hold a large amount of mud to ensure that it can be continuously circulated during the well killing process. It should be noted that during the well killing process, well killing fluid and drilling fluid are usually used at the same time. Specifically, drilling fluid is mainly used to form a certain bottom hole pressure in the well to prevent the occurrence of dangerous situations such as bottom hole protrusion and blowout; and well killing fluid refers to a special liquid injected into the bottom of the well when the isolation operation is performed at the bottom of the well. The well killing fluid usually has a high density and viscosity to form a certain bottom hole isolation pressure, and has good plugging performance, which can effectively control the bottom hole pressure and bottom hole conditions. The leakage rate of the drilling fluid mentioned in this optional embodiment can be determined by the amount of liquid reduced in the mud pool. According to the change in the mud pool and the time from the start of construction to the current time, the rate of leakage of drilling fluid to the formation can be determined by the following formula:

[0044]

[0045] Where V is the change of the mud pool, in m -3 ; T is the well-killing time, in seconds.

[0046] As an optional embodiment, the bottom hole pressure of the target well is determined according to the construction parameters at the current moment, including: when the construction parameters at the current moment include the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, the boundary conditions obeyed by the flow of the fluid in the target well are determined; under the constraints of the boundary conditions, the bottom hole pressure is obtained based on the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, and a predetermined set of multiphase flow equations.

[0047] Optionally, during the process of well killing by the back pressure method, the bottom hole pressure can be calculated by the wellbore multiphase flow equations. First, the multiphase flow equations can be established using the principles of fluid mechanics and the mass conservation equation to determine the boundary conditions that the fluid follows when flowing in the target well; then, the target well size, target well structure, drilling fluid rheology, and well killing fluid rheology can be brought into the multiphase flow equations, and the above equations can be solved in combination with the fixed solution conditions under actual working conditions, and the pressure change curves at different wellbore positions over time can be calculated to obtain the bottom hole pressure.

[0048] It should be noted that the calculation of bottom hole pressure is a complex process involving the interaction of multiple parameters and flow phenomena. Therefore, before performing the calculation, various factors can be carefully considered and appropriate physical equations and calculation methods can be selected.

[0049] As an optional embodiment, the formation pressure of the formation in which the target well is located is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the standpipe pressure, the density of the drilling fluid and the length of the drill string in the target well, judging whether the drill bit is located at the bottom of the target well; when the drill bit is located at the bottom of the target well, 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 to obtain the formation pressure; when the drill bit is not located at the bottom of the target well, substituting the standpipe 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, gas intrusion may be discovered during wellhead production, and well shut-in measures can be taken in a timely manner. When the wellhead pressure gradually stabilizes, data such as the riser pressure when the well is shut in are obtained, and the pressure at the drill bit is determined based on the shut-in riser pressure and the drilling fluid column pressure in the drill string, and then the formation pressure is determined.

[0051] Specifically, the formation pressure can be determined in two cases according to the location of the drill bit. When the drill bit is at the bottom of the well, the formation pressure P can be determined by the following formula: e :

[0052] P e =P d +ρ d gH,

[0053] Where P d is the riser pressure, in MPa; ρ d is the density of the drilling fluid originally input, in g·cm -3 ; H is the thickness of the leakage layer, in m; g is the gravitational acceleration, in m·s -2 .

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

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

[0056] In the formula, h d is the length of the drill string in the wellbore, in meters; ρ m The density of the fluid in the section from the drill bit to the bottom of the well, in g·cm -3 The density of the fluid in the section from the drill bit to the bottom of the well can be calculated by the gas content of the section using the following formula: m :

[0057] ρ m =E g ρ g +(1-E g )ρ d ,

[0058] Among them, ρ g Gas density, that is, the density of the gas at the bottom of the well, E g The gas content is the proportion of gas in the 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 moment are determined according to the liquid absorption index, including: obtaining the fracture parameters of the fractures in the target well based on the liquid absorption index and a predetermined empirical formula, wherein the empirical formula is determined in the following manner: obtaining multiple sets of experimental data, wherein each set of experimental data in the multiple sets of experimental data includes the liquid absorption index of the experimental well and the fracture parameters of the experimental well; establishing a relationship between the liquid absorption index of the experimental well and the fracture parameters of the experimental well based on the multiple sets of experimental data to obtain the empirical formula.

[0060] Optionally, experiments or numerical simulations of the absorption index under different fracture parameters and drilling fluid rheology can be conducted. Under experimental conditions, the bottom hole pressure and the leakage rate of the drilling fluid under different fracture parameters and drilling fluid rheology (given formation pressure) can be measured, and the corresponding value of the absorption index can be obtained according to the definition of the absorption index, and an empirical relationship between the absorption index and fracture parameters (fracture density and width) can be established. In practical applications, as long as the absorption index is substituted into the predetermined empirical relationship, the fracture parameters corresponding to the absorption index can be determined.

[0061] As an optional embodiment, the construction parameters at the current moment are adjusted according to the crack parameters to determine the construction parameters at the next moment, including at least one of the following: when 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; when the crack parameters are between the first threshold and the predetermined second threshold, the construction parameters at the current moment are kept unchanged to obtain the construction parameters at the next moment; when the crack parameters are lower than 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 of the pressure-back method for well killing can be adjusted according to the fracture parameters. If the fracture parameters are small and lower than the second threshold, the construction parameters at the current moment need to be increased under the same pressure-back speed and well killing fluid displacement. However, the increased pump pressure is very high and easily exceeds the bearing pressure of the ground equipment. Whether the pressure-back method for well killing is applicable and whether it will cause more serious accidents by fracturing the reservoir needs to be reconsidered. If the fracture parameters are relatively suitable and are between the first threshold and the predetermined second threshold, the construction parameters at the current moment can be kept unchanged. If the fracture parameters are large and exceed the first threshold, a certain layer section may be leaked to cause permanent fractures, and serious leakage may easily occur while killing the well. At this time, the construction parameters at the current moment should be appropriately reduced, and after the pressure-back operation is completed, if the fractures generated by the pressure-back process cannot be closed again, plugging treatment is required to improve the bearing capacity of the formation before drilling can continue.

[0063] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

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

[0065] According to an embodiment of the present invention, a device for adjusting well killing construction parameters for implementing the above method for adjusting well killing construction parameters is also provided. Figure 3 is a structural block diagram of a device for adjusting well killing construction parameters according to an embodiment of the present invention, such as Figure 3 As shown, the device for adjusting well-killing 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-killing construction parameters is described below.

[0066] The acquisition module 32 is used to construct the target well using the pressure-back method and obtain the construction parameters at the current moment.

[0067] The first determination module 34 is connected to the acquisition module 32 and is used to determine the liquid absorption index of the formation where the target well is located according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid.

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

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

[0070] It should be noted that the acquisition module 32, the first determination module 34, the second determination module 36 and the third determination module 38 correspond to steps S202 to S208 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

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

[0072] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the method and device for adjusting the well-killing construction parameters in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, realizing the above-mentioned method for adjusting the well-killing construction parameters. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0073] The processor can call the information and application programs stored in the memory through the transmission device to execute the following steps: construct the target well using the pressure-back method to obtain the construction parameters at the current moment; determine the liquid absorption index of the formation where the target well is located based on the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; 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; adjust the construction parameters at the current moment based on the fracture parameters to determine the construction parameters at the next moment after the current moment.

[0074] Optionally, the liquid 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 leakage rate of the drilling fluid, 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; determining the liquid absorption index based on the leakage rate of the drilling fluid, the bottom hole pressure and the formation pressure.

[0075] Optionally, the leakage rate of the drilling fluid is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the well killing time and the change in the mud pool, the leakage rate of the drilling fluid is obtained based on the change in the mud pool and the well killing time, wherein the well killing time is the time from the start of construction to the current moment, and the mud pool is used to accumulate the drilling fluid input into the target well and circulated 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: when the construction parameters at the current moment include the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, determining the boundary conditions obeyed by the flow of the fluid in the target well; under the constraints of the boundary conditions, the bottom hole pressure is obtained based on the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, and a predetermined set of multiphase flow equations.

[0077] Optionally, the formation pressure of the formation in which the target well is located is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the standpipe pressure, the density of the drilling fluid and the length of the drill string in the target well, judging whether the drill bit is located at the bottom of the target well; when the drill bit is located at the bottom of the target well, 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 to obtain the formation pressure; when the drill bit is not located at the bottom of the target well, substituting the standpipe 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 liquid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current moment are determined, including: based on the liquid absorption index and a predetermined empirical formula, the fracture parameters of the fractures in the target well are obtained, wherein the empirical formula is determined in the following manner: obtaining multiple sets of experimental data, wherein each set of experimental data in the multiple sets of experimental data includes the liquid absorption index of the experimental well and the fracture parameters of the experimental well; based on the multiple sets of experimental data, establishing a relationship between the liquid absorption index of the experimental well and the fracture parameters of the experimental well to obtain the empirical formula.

[0079] Optionally, the construction parameters at the current moment are adjusted according to the crack parameters to determine the construction parameters at the next moment, including at least one of the following: when 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; when 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; when the crack parameters are lower than the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0080] By adopting the embodiment of the present invention, a scheme for adjusting the well-pressing construction parameters is provided. A liquid absorption index is introduced to determine the fracture parameters of the formation, and the construction parameters at the current moment are obtained by constructing the target well by adopting the pressure-back method; the liquid absorption index of the formation where the target well is located is determined according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; the fracture parameters of the fractures in the formation where the target well is located at the current moment are determined according to the liquid absorption index; the construction parameters at the current moment are adjusted according to the fracture parameters, and the construction parameters at the next moment after the current moment are determined, thereby achieving the purpose of determining the liquid absorption index according to the real-time construction parameters and then determining the fracture parameters, thereby achieving the technical effect of obtaining the fracture parameters of the formation in real time, and thus solving the technical problem that it is difficult to obtain the fracture parameters of the formation of the pressed-back layer section in real time during the pressure-back method well-pressing process.

[0081] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0082] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the method for adjusting the well killing construction parameters provided in the above embodiment.

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

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: constructing the target well using the pressure-back method to obtain the construction parameters at the current moment; determining the liquid absorption index of the formation where the target well is located based on the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; determining 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; adjusting the construction parameters at the current moment based on the fracture parameters to determine the construction parameters at the next moment after the current moment.

[0085] Optionally, the liquid 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 leakage rate of the drilling fluid, 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; determining the liquid absorption index based on the leakage rate of the drilling fluid, the bottom hole pressure and the formation pressure.

[0086] Optionally, the leakage rate of the drilling fluid is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the well killing time and the change in the mud pool, the leakage rate of the drilling fluid is obtained based on the change in the mud pool and the well killing time, wherein the well killing time is the time from the start of construction to the current moment, and the mud pool is used to accumulate the drilling fluid input into the target well and circulated 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: when the construction parameters at the current moment include the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, determining the boundary conditions obeyed by the flow of the fluid in the target well; under the constraints of the boundary conditions, the bottom hole pressure is obtained based on the target well size, target well structure, drilling fluid rheology and well-killing fluid rheology, and a predetermined set of multiphase flow equations.

[0088] Optionally, the formation pressure of the formation in which the target well is located is determined based on the construction parameters at the current moment, including: when the construction parameters at the current moment include the standpipe pressure, the density of the drilling fluid and the length of the drill string in the target well, judging whether the drill bit is located at the bottom of the target well; when the drill bit is located at the bottom of the target well, 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 to obtain the formation pressure; when the drill bit is not located at the bottom of the target well, substituting the standpipe 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 liquid absorption index, the fracture parameters of the fractures in the formation where the target well is located at the current moment are determined, including: based on the liquid absorption index and a predetermined empirical formula, the fracture parameters of the fractures in the target well are obtained, wherein the empirical formula is determined in the following manner: obtaining multiple sets of experimental data, wherein each set of experimental data in the multiple sets of experimental data includes the liquid absorption index of the experimental well and the fracture parameters of the experimental well; based on the multiple sets of experimental data, establishing a relationship between the liquid absorption index of the experimental well and the fracture parameters of the experimental well to obtain the empirical formula.

[0090] Optionally, the construction parameters at the current moment are adjusted according to the crack parameters to determine the construction parameters at the next moment, including at least one of the following: when 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; when 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; when the crack parameters are lower than the second threshold, the construction parameters at the current moment are increased to obtain the construction parameters at the next moment.

[0091] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0092] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made 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. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

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

[0095] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0096] If the integrated unit is implemented in the form of 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, 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. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for adjusting well killing construction parameters, characterized in that: include: Use the pressure-back method to construct the target well and obtain the construction parameters at the current moment; Determine the liquid absorption index of the formation where the target well is located according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; Determining fracture parameters of fractures in the formation where the target well is located at the current moment according to the liquid absorption index; According to the crack parameters, the construction parameters at the current moment are adjusted to determine the construction parameters at the next moment after the current moment.

2. The method according to claim 1, characterized in that Determining the liquid absorption index of the formation where the target well is located according to the construction parameters at the current moment includes: Determine the drilling fluid loss rate, the bottom hole pressure of the target well, and the formation pressure of the formation where the target well is located according to the construction parameters at the current moment; The fluid absorption index is determined according to the loss rate of the drilling fluid, the bottom hole pressure and the formation pressure.

3. The method according to claim 2, characterized in that Determining the drilling fluid loss rate according to the construction parameters at the current moment includes: When the construction parameters at the current moment include the well killing time and the change in the mud pool, the leakage rate of the drilling fluid is obtained according to the change in the mud pool and the well killing time, wherein the well killing time is the time length from the start time of construction to the current moment, and the mud pool is used to accumulate the drilling fluid input into the target well and circulated out from the target well.

4. The method according to claim 2, characterized in that: Determining the bottom hole pressure of the target well according to the construction parameters at the current moment includes: Determine the boundary conditions that the fluid complies with when flowing in the target well, when the construction parameters at the current moment include the target well size, the target well structure, the rheology of the drilling fluid, and the rheology of the well-killing fluid; 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 well killing fluid, and a predetermined multiphase flow equation group.

5. The method according to claim 2, characterized in that: Determining the formation pressure of the formation where the target well is located according to the construction parameters at the current moment includes: When the construction parameters at the current moment include the standpipe 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; When the drill bit is located 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 first predetermined formula to obtain the formation pressure; When the drill bit is not located 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 Determining the fracture parameters of the fractures in the formation where the target well is located at the current moment according to the liquid absorption index includes: Based on the liquid absorption index and a predetermined empirical formula, the fracture parameters of the fracture in the target well are obtained, wherein the empirical formula is determined in the following manner: a plurality of groups of experimental data are acquired, wherein each group of experimental data in the plurality of groups of experimental data includes the liquid absorption index of the experimental well and the fracture parameters of the experimental well; based on the plurality of groups of experimental data, a relationship between the liquid absorption index of the experimental well and the fracture parameters of the experimental well is established to obtain the empirical formula.

7. The method according to any one of claims 1 to 6, characterized in that: The step of adjusting the construction parameters at the current moment according to the crack parameters to determine the construction parameters at the next moment includes at least one of the following: When the crack parameter exceeds a predetermined first threshold, reducing the construction parameter at the current moment to obtain the construction parameter at the next moment; When the crack parameter is between the first threshold and a predetermined second threshold, the construction parameter at the current moment is kept unchanged to obtain the construction parameter at the next moment; When the crack parameter is lower than the second threshold, the construction parameter at the current moment is increased to obtain the construction parameter at the next moment.

8. A device for adjusting well-killing construction parameters, characterized in that: include: An acquisition module is used to construct the target well using the pressure-back method and obtain the construction parameters at the current moment; A first determination module is used to determine a liquid absorption index of a formation where the target well is located according to the construction parameters at the current moment, wherein the liquid absorption index represents the ability of the formation to absorb liquid; A second determination module is used to determine the fracture parameters of the fractures in the formation where the target well is located at the current moment according to the liquid absorption index; The third determination module is used to adjust the construction parameters at the current moment according to the crack parameters, and determine the construction parameters at the next moment after the current moment.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the method for adjusting well killing construction parameters as described in any one of claims 1 to 7.

10. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is running, the processor executes the method for adjusting well killing construction parameters as described in any one of claims 1 to 7.

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