Throttle valve opening degree determination method, throttle valve opening degree automatic control method and electronic equipment

Abstract

The invention relates to the field of petroleum drilling, and discloses a throttle valve opening degree determination method, a throttle valve opening degree automatic regulation and control method and electronic equipment. The method comprises the following steps: determining an opening degree and pressure drop equation of a throttle valve according to a low pump stroke test result of a shaft; determining overflow stratum vertical depth and well shut-in vertical pressure when overflow occurs, and determining stratum pore pressure through a preset deep stratum pressure determination model; the well killing mode is determined, and the well killing fluid density is determined through a preset well killing fluid density determination model according to the layer pore pressure; performing multiphase flow analysis to determine a casing pressure and time equation under the well killing fluid density; and according to the casing pressure and time equation and the throttle valve opening and pressure drop equation, the throttle valve opening and time equation under the well killing mode is determined. And automatically controlling the opening degree of the throttle valve through the throttle valve opening degree and time equation according to the current well killing operation time. The problems of high construction risk, low control precision and the like due to the fact that field well killing operation depends on manual control can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling, in particular to a throttle valve opening degree determination method, a throttle valve opening degree automatic control method, a storage medium, a computer program product and an electronic device. BACKGROUND

[0002] The purpose of the background description provided herein is to generally present the context of the application. The statements described herein are not necessarily prior art.

[0003] At present, with the development of drilling technology and the increasing demand for oil and gas resources in the national economy, oil and gas field exploration and development gradually turn to deep and complex oil and gas reservoirs, especially the development of gas reservoirs containing H2S, CO2 and other acid gases and high temperature and high pressure gas fields, which causes great difficulty to drilling operation. Once the downhole complex situation or wellhead out of control occurs, it may cause equipment damage, oil and gas well abandonment, not only disrupt the normal drilling plan and cause huge economic losses, but also damage oil and gas resources, pollute the environment, and even endanger personal safety. In view of this, well killing technology as the primary well control means after overflow and blowout occurs, its control accuracy and automation degree will directly affect the safety and efficiency of well killing.

[0004] At present, the well killing wellbore pressure control technology mainly has the following deficiencies:

[0005] (1) Based on the manual operation of the throttle valve of the field throttling well killing manifold, the response time is long, the control precision is low, and the full-process high-precision control of the standpipe pressure during throttling well killing cannot be realized; moreover, due to the high throttling pressure of ultra-deep well killing, long construction time and easy leakage of long-term high-pressure operation of the throttle valve, the personnel operation faces greater risks;

[0006] (2) The operation is carried out by controlling the field throttling well killing manifold hydraulic throttle valve through a remote hydraulic control system, which solves the risk of high pressure injury to the operating personnel due to the leakage of the throttle valve or high-pressure manifold at a certain extent, but still cannot realize the automatic control of the construction parameter collection, wellhead back pressure and standpipe pressure during well killing; and the wellbore pressure control precision is low. SUMMARY

[0007] In view of the above problems, the present application provides a throttle valve opening degree determination method, a throttle valve opening degree automatic control method, a device, a storage medium and an electronic device. In the present application, by establishing the opening-pressure drop control equation of the throttle valve under the well killing displacement, simulating the change trend of the overflow well killing standpipe pressure and wellhead back pressure, calculating the time-opening degree control equation of the well killing throttle valve during well killing, and combining the well killing wellbore pressure automatic control system, the automatic, rapid and high-precision control of the overflow throttling well killing wellbore pressure is realized.

[0008] In a first aspect, the present application provides a throttle opening degree determination method, the method comprising:

[0009] determining a relationship between a throttle opening degree and a pressure drop according to a low pump stroke test result of a wellbore;

[0010] determining a flowing formation vertical depth and a shut-in standing pressure when overflow occurs, and determining a formation pore pressure through a preset deep formation pressure determination model according to the flowing formation vertical depth and the shut-in standing pressure;

[0011] determining a kill method, and determining a kill fluid density through a preset kill fluid density determination model according to the formation pore pressure;

[0012] performing multiphase flow analysis on the wellbore based on the kill method and the kill fluid density to determine a relationship between casing pressure and time under the kill fluid density;

[0013] determining a relationship between a throttle opening degree and time under the kill method through fitting according to the relationship between the casing pressure and time and the relationship between the throttle opening degree and the pressure drop.

[0014] Further, the relationship between the throttle opening degree and the pressure drop comprises:

[0015] Δp=k1y 4 +k2y 3 +k3y 2 +k4y+k5

[0016] wherein Δp is the pressure drop, y is the throttle opening degree, k1, k2, k3, k4 and k5 are all constants.

[0017] Further, the preset deep formation pressure determination model comprises:

[0018] p p =k6×ρ0×h+p d

[0019] wherein p p is the formation pore pressure, ρ0 is the density of drilling fluid in the wellbore before overflow occurs, h is the flowing formation vertical depth, p d is the shut-in standing pressure, and k6 is a constant.

[0020] Further, the preset kill fluid density determination model comprises:

[0021]

[0022] wherein ρ m is the kill fluid density, and p pis the formation pore pressure, h is the vertical depth of the overflow formation, p e is the additional drilling fluid density, and k6 is a constant.

[0023] Further, the relationship between the choke valve opening and time varies with the time of the well killing operation, and presents a plurality of different curve characteristics.

[0024] In a second aspect, the present application provides a method for automatically controlling the opening of a choke valve, comprising:

[0025] According to the relationship between the choke valve opening and time, the choke valve opening is determined according to the current time of the well killing operation.

[0026] According to the choke valve opening, the opening of the choke valve at the current time of the well killing operation is adjusted to regulate the wellbore pressure.

[0027] Further, the method further comprises:

[0028] The measured wellhead back pressure at the current time of the well killing operation is obtained, and the current opening of the choke valve is determined according to the measured wellhead back pressure and the relationship between the choke valve opening and pressure drop.

[0029] According to the relationship between the choke valve opening and time, the target opening of the choke valve at the current time of the well killing operation is determined.

[0030] According to the difference between the current opening and the target opening, the opening of the choke valve is fine-tuned.

[0031] In a third aspect, the present application provides a computer readable storage medium storing a computer program, which can be executed by one or more processors to implement the steps of the method as described above.

[0032] In a fourth aspect, the present application provides an electronic device comprising a memory and one or more processors, wherein the memory stores a computer program, and the memory and the one or more processors are communicatively connected, and the computer program is executed by the one or more processors to implement the steps of the method as described above.

[0033] In a fifth aspect, the present application provides a computer program product comprising a computer program or instructions, which are executed by a processor to implement the steps of the method as described above.

[0034] Compared with the prior art, the technical solution of the present application has the following advantages or beneficial effects:

[0035] The throttle opening degree determination method disclosed in the application is based on the relationship between the opening degree-pressure drop of the throttle valve under the displacement of the well killing construction, and the relationship between the standing pressure and the wellhead back pressure during the well killing process after overflow occurs is simulated, the relationship between the well killing throttle opening degree and time is calculated in combination with the relationship between the opening degree and the pressure drop; and based on the throttle opening degree automatic control method disclosed in the application, the wellbore pressure automatic control during the well killing process is realized through the automatic control system, and the technical problems such as manual control, high construction risk and low control precision in the field well killing operation can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0037] In addition, it should be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings. The drawings accompanying the specification form part of the present application and are used to provide a further understanding of the present application. The schematic embodiments and their descriptions in the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 An engineer method well killing standing pressure and wellhead back pressure control curve schematic diagram provided for the embodiments of the present application;

[0039] Figure 2 An engineer method well killing standing pressure and wellhead back pressure control curve schematic diagram provided for the embodiments of the present application;

[0040] Figure 3 A driller method well killing standing pressure and wellhead back pressure control curve schematic diagram provided for the embodiments of the present application;

[0041] Figure 4 A driller method well killing wellhead back pressure-time control curve schematic diagram provided for the embodiments of the present application;

[0042] Figure 5 A flowchart of a throttle opening degree determination method provided for the embodiments of the present application;

[0043] Figure 6 A throttle opening degree and pressure drop curve schematic diagram of X well site well killing provided for the embodiments of the present application;

[0044] Figure 7 A throttle opening degree and pressure drop curve schematic diagram of X well site well killing provided for the embodiments of the present application;

[0045] Figure 8 A well killing operation control curve schematic diagram provided for an embodiment of the present application;

[0046] Figure 9 A flowchart of a throttle opening degree automatic control method provided for an embodiment of the present application. DETAILED DESCRIPTION

[0047] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and embodiments, so that how the present application applies technical means to solve technical problems and achieves corresponding technical effects can be fully understood and implemented. The embodiments of the present application and various features in the embodiments can be combined with each other without conflict, and the formed technical solutions are all within the protection scope of the present application.

[0048] It should be clear that the embodiments described below are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0049] A throttle opening degree determination and throttle opening degree automatic control method is disclosed in the present application, which can be applied to automatic regulation and control of throttle wellbore pressure. The time-opening degree control equation of the throttle valve in different stages of throttle well killing is established through the opening degree-pressure drop control equation of the throttle valve, and the automatic control system is automatically adjusted to the corresponding opening degree at the corresponding time, so as to realize accurate control of pressure in the well killing process.

[0050] Embodiment one

[0051] The present embodiment provides a wellbore pressure regulation method, which establishes a time-opening degree control equation of the throttle valve in different stages of throttle well killing through an opening degree-pressure drop control equation of the throttle valve, and automatically adjusts the corresponding opening degree through an automatic control system, thereby realizing accurate control of pressure in the well killing process. The specific steps include:

[0052] (1) Determine the opening degree-pressure drop control equation of the throttle valve:

[0053] Carry out low pump stroke test, measure and record the displacement, drilling fluid density and throttle valve pressure drop under different opening degrees of the throttle valve, establish the throttle valve opening degree and pressure drop equation, and obtain the throttle valve opening degree and differential pressure response characteristics, as shown in Figure 1 .

[0054] (2) Formation pressure analysis and well killing fluid density selection:

[0055] After overflow occurs, the formation pressure of the overflow formation is calculated, and the well killing method and well killing fluid density are selected. The well killing fluid density calculation method is shown in formula (1) and formula (2):

[0056] p p = 0.00981 x p0 x h + p d (1)

[0057]

[0058] wherein, p p is the formation pore pressure, in MPa;

[0059] p0 is the density of the drilling fluid in the wellbore before overflow occurs, in g / cm 3 ;

[0060] h is the vertical depth of the overflow formation, in m;

[0061] p d is the shut-in well pressure, in MPa;

[0062] p e is the additional drilling fluid density, in g / cm 3 .

[0063] It should be noted that the well killing methods include the engineer method and the driller method, etc.

[0064] (3) Simulating the overflow wellbore multiphase flow analysis:

[0065] Based on the selected well killing method and the calculated well killing fluid density in step (2), the overflow wellbore multiphase flow analysis is carried out. According to the initial circulating standpipe pressure pTi and the final circulating standpipe pressure pTf in the well killing operation sheet, the change of the wellhead casing pressure in the choke and kill process under the selected well killing method and well killing fluid density is simulated and analyzed, and the standpipe pressure and casing pressure control curves in the well killing process are obtained, as shown in Figure 2 (engineer method), Figure 3 (driller method).

[0066] (4) Determining the time-opening control equation of the choke valve:

[0067] According to the casing pressure control curve of the selected well killing method (refer to Figure 2 or Figure 3 ) and the relationship between the choke valve opening and the pressure drop (obtained by fitting the pressure drop and opening curve in step (1)), the opening value corresponding to the casing pressure at different times in the casing pressure control curve in step (3) is calculated, which is the required choke valve opening size. Taking the driller method as an example, the choke valve opening control curve corresponding to the casing pressure in different well killing stages is shown in Figure 4 .

[0068] According to the throttle opening degree change curve, the relationship between the throttle opening degree-time is fitted in sections. Taking the driller method of well killing as an example, the polynomial fitting (or other fitting methods) is used to obtain the throttle-time control equation in different time periods, as shown in Table 1:

[0069] Table 1 Throttle opening-time control equation of the driller method of well killing

[0070] [0 < t ≤ tl] [y1 = a1t 2 + b1t + c1]] [t1 < t < t2] [y2 = a2t 2 + b2t + c2] [t2 < t < t3] [y3 = c3] [t3 < t < t4] [y4 = a4t 2 + b4t + c4]

[0071] It should be noted that the fitting method includes any one or a combination of multiple items of polynomial fitting, linear fitting, exponential fitting and power function fitting.

[0072] (5) Real-time control of well killing wellbore pressure:

[0073] During well killing, according to the wellhead back pressure (i.e. casing pressure) collected at the current well killing operation time, based on the well killing automatic control system, and according to the throttle opening-time control equation, the throttle opening degree is automatically adjusted to the corresponding size, that is, the automatic control of the well killing wellhead back pressure can be realized.

[0074] In order to realize more accurate control of wellhead back pressure, according to the wellbore pressure regulation method disclosed in the present application and based on the well killing automatic control system, an opening-back pressure feedback control algorithm is developed to further improve the control accuracy. For example, large opening degree deviation maximum control, fast adjustment of opening degree; small opening degree deviation adopts double PID algorithm.

[0075] Embodiment two

[0076] The embodiment provides a throttle opening degree determination method, by which the relationship between the throttle opening degree and the well killing operation time can be determined.

[0077] Specifically, first, the opening-pressure drop control equation of the throttle valve is determined, then the time-opening degree control equation of the throttle valve in different stages of throttling well killing is established according to the opening-pressure drop control equation of the throttle valve, and finally the throttle opening degree at the current well killing operation time can be determined according to the time-opening degree control equation of the throttle valve. It can be applied to / used in the throttling well killing wellbore.

[0078] In the present application, the engineer method of well killing is adopted and a certain X well in the west is taken as an example. The certain X well in the west is drilled to a well depth of 7300.00 m (vertical depth of 7300.00 m, layer O 2yj ) when overflow occurs, and the actual drilling fluid density is 1.50 g / cm 3 After the overflow occurs, the well is immediately closed, and the standing pressure is 26.1 MPa.

[0079] Figure 5 The flow chart of the throttle opening degree determination method provided in the embodiment of the present application is as follows:Figure 5 As shown, the method disclosed in the embodiments includes the following steps:

[0080] Step 110, determining the relationship between the throttle opening and the pressure drop (also referred to as the throttle opening-pressure drop control equation) according to the low pump stroke test results of the wellbore; wherein the low pump stroke test results include the displacement data of the throttle at different openings, the drilling fluid density data, and the throttle pressure drop data.

[0081] In some embodiments, the relationship between the throttle opening and the pressure drop includes:

[0082] Δp = k1y 4 +k2y 3 +k3y 2 +k4y+k5

[0083] Wherein, Δp is the pressure drop, y is the throttle opening, k1, k2, k3, k4 and k5 are constants.

[0084] Alternatively, the relationship between the throttle opening and the pressure drop can be expressed as:

[0085] Δp = 126.26y 4 -375.56y 3 +416.95y 2 -206.64y+39.31.

[0086] It can be understood that the values of k1, k2, k3, k4 and k5 can be 126.26, -375.56, 416.95, -206.64, 39.31 respectively.

[0087] Alternatively, the relationship between the throttle opening and the pressure drop can refer to Figure 6 , Figure 6 A schematic diagram of the throttle opening-pressure drop curve of the X well site kill valve provided by the embodiments of the present application.

[0088] Step 120, determining the overflow formation vertical depth and the shut-in standing pressure when overflow occurs, and determining the formation pore pressure by a preset deep formation pressure determination model according to the overflow formation vertical depth and the shut-in standing pressure.

[0089] In some embodiments, the preset deep formation pressure determination model includes:

[0090] p p = k6 x p0 x h + p d

[0091] Wherein, p p is the formation pore pressure, p0 is the density of the drilling fluid in the wellbore before overflow occurs, h is the overflow formation vertical depth, and pd k6 is a constant.

[0092] Optionally, the value of k6 is 0.000981, and the density of the drilling fluid in the wellbore before overflow can be obtained by measurement.

[0093] The formation pore pressure can be further determined by the following formula:

[0094] p p = 0.00981 x 1.50 x 7300 + 26.1 = 133.52 MPa

[0095] Step 130, determining the well killing mode, and determining the well killing fluid density according to the formation pore pressure and by a preset well killing fluid density determination model.

[0096] In some embodiments, the preset well killing fluid density determination model comprises:

[0097]

[0098] wherein p m is the well killing fluid density, p p is the formation pore pressure, h is the vertical depth of the overflow formation, p e is the additional drilling fluid density, and k6 is a constant.

[0099] Optionally, the additional drilling fluid density is 0.07.

[0100] The well killing fluid density can be further determined by the following formula:

[0101]

[0102] Step 140, performing multiphase flow analysis on the wellbore based on the well killing mode and the well killing fluid density to determine the relationship between casing pressure and time under the well killing fluid density.

[0103] Optionally, based on the well killing fluid density value calculated in the foregoing steps, overflow wellbore multiphase flow analysis is carried out to analyze the curve characteristics of casing pressure during well killing under the well killing fluid density, which can be referred to in Figure 7 .

[0104] Step 150, determining the relationship between the throttle opening and time under the well killing mode by fitting according to the relationship between the casing pressure and time and the relationship between the throttle opening and pressure drop (which can also be referred to as the time-opening control equation of the throttle).

[0105] Further, under the determined flow rate and drilling fluid density during the well killing operation, different casing pressure values correspond to different opening values. According to the relationship between casing pressure and time, the casing pressure values at different well killing times are determined, and then based on the aforementioned relationship between opening and pressure drop, the throttle valve opening size at different well killing times can be obtained, such as Figure 7 the throttle valve opening size at different well killing times corresponding to the green casing pressure curve. Then, according to the throttle valve opening at different well killing times, fitting is performed to obtain the relationship between opening and time, which can also be called throttle valve opening-time control curve (for reference Figure 7 , the throttle valve opening-time control curve can be composed of Figure 7 y1, y2 and y3 in the middle of the figure).

[0106] In some embodiments, the relationship between the throttle valve opening and time changes with the well killing operation time, showing a plurality of different change curve characteristics.

[0107] In some embodiments, the relationship between the throttle valve opening and time includes: a first change relationship located in a first preset time period, a second change relationship located in a second preset time period, and a third change relationship located in a third preset time period; wherein,

[0108] The first change relationship includes:

[0109] y1=C1t+C2

[0110] wherein y1 is the throttle valve opening, t is the well killing operation time, and C1 and C2 are constants;

[0111] The second change relationship includes:

[0112] y2=C3t 2 +C4t+C5

[0113] wherein y2 is the throttle valve opening, t is the well killing operation time, and C3, C4 and C5 are constants;

[0114] The third change relationship includes:

[0115] y3=C6t 2 +C7t+C8

[0116] wherein y3 is the throttle valve opening, t is the well killing operation time, and C6, C7 and C8 are constants.

[0117] Optionally, in combination with Figure 7, the first preset time period can be set as 0-195 seconds, the second preset time period can be set as 195-434 seconds, and the third preset time period can be set as 434-465 seconds; and the values of C1, C2, C3, C4, C5, C6, C7 and C8 are respectively 0.0084, 20.447, 0.0013, -0.5285, 78.261, -0.0031, 2.8031 and 546.07.

[0118] It can be understood that the relationship between the throttle opening and the time can be represented by the expression in the following table:

[0119] 0<t≤195 [y1 = 0.0084t + 20.447] 195<t≤434 [y2 = 0.0013t 2 -0.5285t + 78.261 <!-- 6 -->]]> 434<t≤465 [y3 = -0.0031t 2 + 2.8031t + 546.07]]

[0120] Further, after the relationship between the throttle opening and the well killing time is determined, the throttle opening at the current well killing time can be determined according to the relationship between the throttle opening and the time.

[0121] Embodiment Three

[0122] The embodiment provides a throttle opening automatic control method based on the foregoing embodiments, which can determine the throttle opening at a certain time according to the time-opening control equation of the throttle at different stages, and automatically adjust the throttle opening to the opening corresponding to the time through an automatic control system according to the corresponding time, so as to realize accurate control of the pressure in the well killing process.

[0123] Please refer to the following table: Figure 9 , Figure 9 The embodiment provides a flowchart of a throttle opening automatic control method. The throttle opening automatic control method disclosed in the embodiment includes the following steps:

[0124] In step 210, the throttle opening is determined according to the current well killing time and the relationship between the throttle opening and the time determined according to the foregoing throttle opening determination method.

[0125] Optionally, the throttle opening at the current well killing time is determined in real time or according to a preset time interval (for example, 1 second, 0.5 second or the like) according to the current well killing time.

[0126] In step 220, the opening of the throttle at the current well killing time is adjusted according to the throttle opening, so as to control the wellbore pressure.

[0127] Optionally, the opening of the throttle is adjusted in real time in the case that the throttle openings at the previous and subsequent times are inconsistent according to the determined throttle opening.

[0128] During the well killing process, according to the wellhead back pressure collected at the current well killing operation time, based on the automatic well killing control system, and according to the relationship between the throttle valve opening and time, the throttle valve opening is automatically adjusted to the corresponding size, that is, the automatic control of the well killing wellhead back pressure can be realized.

[0129] The well killing construction curve can be referred to Figure 8 The measured value of the wellhead back pressure is basically consistent with the target value, and the fine regulation and control of the well killing wellbore pressure is realized.

[0130] In some embodiments, it also includes:

[0131] The measured value of the wellhead back pressure at the current well killing operation time is obtained, and the current opening of the throttle valve is determined according to the relationship between the throttle valve opening and pressure drop according to the measured value of the wellhead back pressure.

[0132] The target opening of the throttle valve at the current well killing operation time is determined according to the relationship between the throttle valve opening and time.

[0133] The opening of the throttle valve is fine-tuned according to the difference between the current opening and the target opening.

[0134] Optionally, the measured value of the wellhead back pressure can be collected in real time by a related sensor.

[0135] Further, by fine-tuning the throttle valve opening, the wellbore pressure can be more finely regulated and controlled.

[0136] Embodiment four

[0137] The embodiment provides a throttle valve opening determination system. The system embodiment can be used to execute the throttle valve opening determination method embodiment of the present application. For details not disclosed in the system embodiment, please refer to the throttle valve opening determination method embodiment of the present application. The system disclosed in the embodiment includes:

[0138] The first determination module is used to determine the relationship between the throttle valve opening and the pressure drop according to the low pump surge test result of the wellbore.

[0139] The second determination module is used to determine the overflow formation vertical depth and the shut-in standing pressure when overflow occurs, and determine the formation pore pressure through a preset deep formation pressure determination model according to the overflow formation vertical depth and the shut-in standing pressure.

[0140] The third determination module is used to determine the well killing mode, and determine the well killing fluid density through a preset well killing fluid density determination model according to the formation pore pressure.

[0141] a fourth determining module, configured to perform multiphase flow analysis on the wellbore based on the kill mode and the kill fluid density, to determine a relationship between casing pressure and time at the kill fluid density;

[0142] a fifth determining module, configured to determine a relationship between choke valve opening and time in the kill mode by fitting according to the relationship between casing pressure and time and the relationship between choke valve opening and pressure drop.

[0143] Those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. Alternatively, they can be realized by program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module.

[0144] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of each module in the choke valve opening determination system can refer to the corresponding process in the foregoing method embodiments, and the present embodiment will not be repeated here.

[0145] Embodiment Five

[0146] The present embodiment provides a choke valve opening automatic control system. The system embodiment can be used to execute the choke valve opening automatic control method embodiments of the present application. For details not disclosed in the system embodiment, please refer to the choke valve opening automatic control method embodiments of the present application. The system disclosed in the present embodiment comprises:

[0147] a choke valve opening determination module, configured to determine the choke valve opening according to the relationship between the choke valve opening and time determined by the choke valve opening determination method as described above according to the current kill operation time;

[0148] a pressure control module, configured to adjust the opening of the choke valve at the current kill operation time according to the choke valve opening, to control the wellbore pressure.

[0149] Those skilled in the art should understand that the modules or steps of the present application described above can be realized by a general computing device, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices. Alternatively, they can be realized by a program code executable by a computing device, so that they can be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described can be executed in an order different from that shown here, or they can be made into individual integrated circuit modules, or a plurality of modules or steps can be made into a single integrated circuit module.

[0150] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of each module in the throttle opening automatic control system can refer to the corresponding process in the foregoing method embodiments, and this embodiment will not be repeated here.

[0151] Embodiment six

[0152] The embodiment provides a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the method steps in the foregoing method embodiments. This embodiment will not be repeated here.

[0153] The computer readable storage medium can also include a computer program, a data file, a data structure, or a combination thereof. The computer readable storage medium or the computer program can be specifically designed and understood by those skilled in the computer software field, or it can be known and available to those skilled in the computer software field. Examples of the computer readable storage medium include: magnetic media, such as hard disks, floppy disks, and magnetic tapes; optical media, such as CD ROM disks and DVDs; magneto-optical media, such as optical disks; and hardware devices specifically configured to store and execute computer programs, such as read-only memory (ROM), random access memory (RAM), flash memory; or servers, app application stores, and the like. Examples of the computer program include machine code (e.g., code generated by a compiler) and files containing high-level code, which can be executed by a computer by using an interpreter. The described hardware devices can be configured to function as one or more software modules to perform the above-described operations and methods, and vice versa. In addition, the computer readable storage medium can be distributed in a networked computer system, and the program code or computer program can be stored and executed in a distributed manner.

[0154] Embodiment seven

[0155] The embodiment provides a computer program product. The computer program product includes a computer program or instructions which, when executed by a processor, implement all or part of the steps of the method in the foregoing method embodiment, and the embodiment is not repeated here.

[0156] Further, the computer program product can include one or more computer executable components configured to perform embodiments when the program is run; the computer program product can also include a computer program tangibly embodied on a non-transitory computer readable medium, the computer program including program code for performing any of the methods of the present embodiments. In such embodiments, the computer program can be downloaded from a network and installed, and / or installed from a removable medium.

[0157] Embodiment eight

[0158] The embodiment provides an electronic device, which can include one or more processors, a memory, a multimedia component, an input / output (I / O) interface, and a communication component.

[0159] The one or more processors are configured to perform all or part of the steps of the method in the foregoing method embodiment. The memory is configured to store various types of data, which can include, for example, instructions of any application program or method in the electronic device, and application-related data.

[0160] The one or more processors can be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic elements, which are configured to perform the method in the foregoing method embodiment.

[0161] The memory can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0162] The multimedia component can include a screen, which can be a touch screen, and an audio component for outputting and / or inputting audio signals. For example, the audio component can include a microphone for receiving external audio signals. The received audio signals can be further stored in the memory or transmitted through the communication component. The audio component also includes at least one speaker for outputting audio signals.

[0163] The I / O interface provides an interface between the one or more processors and other interface modules, which can be a keyboard, a mouse, a button, etc. These buttons can be virtual buttons or physical buttons.

[0164] The communication component is used for wired or wireless communication between the electronic device and other devices. Wired communication includes communication through a network port, a serial port, etc.; wireless communication includes Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G, 4G, 5G, or a combination of one or more of them.

[0165] It should be understood that many of the modules and methods described herein can be implemented by computer, e.g., as computer-executable instructions. To this end, the computer can include a computer-readable medium storing computer-executable instructions, which, when executed by the computer, cause the computer to perform the methods described herein. The computer-readable medium can be, e.g., a magnetic or optical disk storage device, a magnetic tape, or a flash memory. The computer-readable medium can be encoded with the computer-executable instructions in the form of machine language optimized code or, less commonly, in the form of higher-level code (e.g., Java® or C++) that is compiled into machine language optimized code prior to execution by the computer. The computer-readable medium can be encoded with the computer-executable instructions in the form of object code, or in the form of source code which can be compiled into object code prior to execution by the computer.

[0166] In this application, the terms "comprise", "contain", or any other variant thereof are intended to cover a non-exclusive inclusion, so that processes, methods, articles, or devices that comprise a list of elements do not only include those elements, but also include other elements that are not expressly listed, or further include elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, device or equipment comprising the element; if there is a description of "first", "second", etc., it is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features; in the description of the present application, unless otherwise specified, the meaning of the term "a plurality of" or "a plurality" is at least two; if there is a description of a server, it should be noted that the server can be a stand-alone physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server capable of providing cloud server, cloud database, cloud storage and CDN and other basic cloud computing services; if there is a description of intelligent terminal or mobile device in the present application, it should be noted that the intelligent terminal or mobile device can be a mobile phone, tablet computer, smart watch, netbook, wearable electronic device, personal digital assistant (PDA), augmented reality technology device (AR), virtual reality device (VR), smart television, smart sound, personal computer (PC) and the like, but is not limited thereto, and the specific form of the intelligent terminal or mobile device is not specially limited in the present application.

[0167] Finally, it should be noted that in the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "one example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0168] Although the embodiments of the present application have been shown and described above, it is understood that all the above-described embodiments are exemplary only, the contents described are merely adopted for the purpose of facilitating the understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which the present application belongs can make any modification and change in the form and details without departing from the spirit and scope of the present application, but the protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A throttle opening degree determination method characterized by comprising: The method comprises: determining a relationship between a throttle opening and a pressure drop according to a low pump-off test result of a wellbore; determining a thief zone vertical depth and a shut-in standing pressure when overflow occurs, and determining a formation pore pressure through a preset deep formation pressure determination model according to the thief zone vertical depth and the shut-in standing pressure; determining a kill method, and determining a kill fluid density through a preset kill fluid density determination model according to the formation pore pressure; performing multiphase flow analysis on the wellbore based on the kill method and the kill fluid density to determine a relationship between casing pressure and time under the kill fluid density; determining a relationship between a throttle opening and time under the kill method through fitting according to the relationship between the casing pressure and time and the relationship between the throttle opening and the pressure drop.

2. The throttle opening degree determination method according to claim 1, characterized by, The relationship between the throttle opening and the pressure drop comprises: Ap = kly 4 + k2y 3 + k3y 2 + k4y + k5 wherein Δp is the pressure drop, y is the throttle opening, and k1, k2, k3, k4 and k5 are all constants.

3. The throttle opening degree determination method according to claim 1, characterized by, The preset deep formation pressure determination model comprises: p p = k6 x p0 x h + p d where p p is the formation pore pressure, p0 is the density of the drilling fluid in the wellbore before overflow, h is the vertical depth of the overflow formation, p d is the shut-in standing pressure, and k6 is a constant.

4. The throttle opening degree determination method according to claim 1, characterized by, The preset kill fluid density determination model comprises: where p m is the density of the drilling fluid, p p is the formation pore pressure, h is the vertical depth of the overflow formation, p e is the additional drilling fluid density, and k6 is a constant.

5. The throttle opening determination method according to claim 1, characterized in that The relationship between the throttle opening and time varies in a plurality of different curve characteristics with the change of the kill operation time.

6. A throttle opening degree automatic control method characterized by comprising: The method comprises: determining a throttle opening according to a current kill operation time and the relationship between the throttle opening and time determined through the method of any one of claims 1 to 5; adjusting the opening of the throttle valve at the current kill operation time according to the throttle opening to regulate the wellbore pressure.

7. The throttle opening automatic control method according to claim 6, characterized by, Further comprising: obtaining a measured wellhead back pressure value at the current kill operation time, and determining a current throttle opening through the relationship between the throttle opening and the pressure drop according to the measured wellhead back pressure value; determining a target throttle opening at the current kill operation time according to the relationship between the throttle opening and time; fine-tuning the opening of the throttle valve according to the difference between the current throttle opening and the target throttle opening.

8. A computer program product comprising a computer program or instructions, characterized in that, The computer program or instructions, when executed by a processor, implement the steps of the method of any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer program stored in the computer readable storage medium, when executed by one or more processors, implements the steps of the method of any one of claims 1 to 7.

10. An electronic device, comprising: The device comprises a memory and a processor, and the memory stores a computer program which, when executed by the processor, implements the steps of the method of any one of claims 1 to 7.

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