Downhole dynamic pressure acquisition method and device based on annulus liquid level measurement

Abstract

The invention relates to the technical field of well drilling monitoring, in particular to a well bottom dynamic pressure obtaining method and device based on annulus liquid level measurement, and the method comprises the steps that well drilling related data of all time points are collected in real time, and the well drilling related data comprise an annulus liquid level parameter, a drilling fluid density parameter and a well depth parameter; and obtaining the shaft bottom static pressure at the corresponding time point based on the well drilling related data, and completing dynamic monitoring of the shaft bottom static pressure. The annular liquid level parameter, the drilling fluid density parameter and the well depth parameter at each time point are continuously collected, so that the well bottom static pressure at each time point is continuously calculated, and dynamic monitoring of the well bottom static pressure is achieved; furthermore, when the oil well has the leakage working condition, the bottom hole pressure at the time point during leakage can be quickly obtained, and data support is provided for subsequent disposal of workers.

Description

Technical Field

[0001] The invention relates to the technical field of drilling monitoring, in particular to a method and a device for acquiring bottom hole dynamic pressure based on annular space liquid level measurement. Background Art

[0002] With the development of information technology and manufacturing technology, kick and leakage are common problems encountered during drilling. An advanced, efficient and accurate method is urgently needed to calculate the bottom hole dynamic pressure to ensure the safety of well control operations. In drilling operations, an online wellbore level meter is used to measure the annular liquid level, and drilling fluid parameters are collected by monitoring equipment such as comprehensive logging instruments or drilling instruments at the drilling site. By initializing the wellbore structure, the bottom hole pressure parameters can be calculated quickly and conveniently. Through data sharing, a scientific basis is provided for hydraulics and formation pressure evaluation, thereby improving the early warning capabilities of leakage and kick, transforming traditional passive well control into active well control, and reducing drilling risks to a minimum.

[0003] Formation pressure prediction and evaluation has always been a difficult problem to be solved in oil and gas drilling. The traditional algorithm is based on the calculation of vertical well depth and drilling fluid density by comprehensive logging instrument, and the bottom hole pressure is calculated from the wellhead, resulting in insufficient calculation accuracy. The prediction result can only be used as a reference for drilling design, so once a well leak occurs, the loss caused is immeasurable. In addition, the traditional method of estimating the bottom hole dynamic pressure using empirical formulas or establishing models to simulate and calculate the bottom hole pressure cannot accurately monitor the bottom hole dynamic pressure in real time. Summary of the invention

[0004] The present invention provides a method and device for obtaining bottom hole dynamic pressure based on annular space liquid level measurement, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing bottom hole pressure acquisition method only uses vertical well depth and drilling fluid density to calculate the bottom hole pressure, resulting in low calculation accuracy.

[0005] One of the technical solutions of the present invention is achieved by the following measures: A method for obtaining bottom hole dynamic pressure based on annular space liquid level measurement, comprising:

[0006] Real-time collection of drilling-related data at each time point, including annular liquid level parameters, drilling fluid density parameters and well depth parameters;

[0007] Based on the drilling related data, the bottom hole static pressure at the corresponding time point is obtained to complete the dynamic monitoring of the bottom hole static pressure;

[0008] P=ρg(HH slev )

[0009] Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slevis the annulus liquid level parameter.

[0010] The following are further optimizations and / or improvements to the above technical solutions:

[0011] The above-mentioned real-time collection of drilling-related data at various time points includes:

[0012] Use the wellbore liquid level monitor to collect the annular liquid level parameters at each time point;

[0013] The drilling fluid density parameters and well depth parameters at each time point are collected using a comprehensive logging instrument or a drilling parameter instrument.

[0014] The above also includes determining the time point of leakage when the oil well has leakage conditions, and obtaining the corresponding bottom hole static pressure according to the annular space liquid level parameters, drilling fluid density parameters and well depth parameters at the time point of leakage.

[0015] The second technical solution of the present invention is achieved by the following measures: a device for acquiring bottom hole dynamic pressure based on annular space liquid level measurement, comprising:

[0016] A real-time acquisition unit collects drilling-related data at each time point in real time, wherein the drilling-related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters;

[0017] The pressure acquisition unit acquires the bottom hole static pressure at the corresponding time point based on the drilling related data, and completes the dynamic monitoring of the bottom hole static pressure;

[0018] P=ρg(HH slev )

[0019] Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

[0020] The following are further optimizations and / or improvements to the above technical solutions:

[0021] The above also includes a retrospective acquisition unit, which determines the leakage time point when the oil well has a leakage condition, and obtains the corresponding bottom hole static pressure according to the annular space liquid level parameter, drilling fluid density parameter and well depth parameter at the leakage time point.

[0022] The above-mentioned real-time acquisition unit comprises:

[0023] The acquisition control module receives drilling related data at each time point, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters;

[0024] The first acquisition module uses a wellbore liquid level monitor to collect annular space liquid level parameters at each time point;

[0025] The second acquisition module uses a comprehensive logging instrument or a drilling parameter instrument to collect the drilling fluid density parameters and well depth parameters at each time point.

[0026] The present invention continuously collects drilling related data at various time points (drilling related data include annulus liquid level parameters, drilling fluid density parameters and well depth parameters), thereby continuously calculating the bottom hole static pressure at each time point, realizing dynamic monitoring of the bottom hole static pressure, solving the problem that the existing method only uses a comprehensive logging instrument to calculate the vertical well depth and drilling fluid density, calculates the bottom hole pressure from the wellhead, and the bottom hole pressure prediction accuracy is not high enough, and effectively improves the accuracy and real-time performance of obtaining the bottom hole static pressure during the drilling process; further, when an oil well leaks, the bottom hole pressure at the time of the leak can be quickly obtained, providing data support for the subsequent disposal of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 The present invention is a schematic flow chart of a method.

[0028] Attached Figure 2 The present invention is another method flow chart.

[0029] Attached Figure 3 It is a schematic diagram of the device structure of the present invention. DETAILED DESCRIPTION

[0030] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0031] The present invention will be further described below in conjunction with embodiments and drawings:

[0032] Embodiment 1: As attached Figure 1 , 2 As shown, an embodiment of the present invention discloses a method for obtaining bottom hole dynamic pressure based on annular space liquid level measurement, comprising:

[0033] Step S110, collecting drilling related data at each time point in real time, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters.

[0034] The above steps specifically include:

[0035] (1) Use the wellbore liquid level monitor to collect the annulus liquid level parameters at each time point;

[0036] (2) Use a comprehensive logging instrument or a drilling parameter meter to collect the drilling fluid density parameters and well depth parameters at each time point.

[0037] Here, a wellbore liquid level monitor is used to collect the annulus liquid level parameters at various time points. Data is collected at multiple measuring points such as the wellbore manifold, bypass, water hole, and pressure gauge M20, and transmitted wirelessly to the main control system of the mud logging room, achieving a convenient and fast transmission method. Unlike other liquid level monitoring systems, this system can not only be used for shut-in liquid level collection under complex conditions, but also for fully automatic monitoring when the well is opened under normal operating conditions.

[0038] Step S120, acquiring the bottom hole static pressure at the corresponding time point based on the drilling related data, and completing the dynamic monitoring of the bottom hole static pressure;

[0039] P=ρg(HH slev )

[0040] Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

[0041] This may further include calculating the pressure gradient and the drilling fluid equivalent density;

[0042] Pressure gradient G, that is, the change in pressure per unit increase in vertical depth:

[0043] G=pH=gρ

[0044] Among them, P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter;

[0045] Drilling fluid equivalent density ρ e , that is, the drilling fluid density:

[0046] ρ e =P(9.81H)=G9.81

[0047] Among them, G is the pressure gradient; P is the hydrostatic pressure; and H is the well depth parameter.

[0048] The embodiment of the present invention discloses a method for acquiring bottom hole dynamic pressure based on annulus liquid level measurement, which continuously collects drilling related data at various time points (drilling related data include annulus liquid level parameters, drilling fluid density parameters and well depth parameters), thereby continuously calculating the bottom hole static pressure at each time point, realizing dynamic monitoring of the bottom hole static pressure, solving the problem that the existing method only uses a comprehensive logging instrument to calculate the vertical well depth and drilling fluid density, calculates the bottom hole pressure from the wellhead, and the bottom hole pressure prediction accuracy is not high enough, and effectively improves the accuracy and real-time performance of acquiring the bottom hole static pressure during the drilling process.

[0049] Embodiment 2: As attached Figure 2 As shown, an embodiment of the present invention discloses a method for obtaining bottom hole dynamic pressure based on annular space liquid level measurement, comprising:

[0050] Step S210, collecting drilling related data at each time point in real time, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters.

[0051] Step S220, acquiring the bottom hole static pressure at the corresponding time point based on the drilling related data, and completing the dynamic monitoring of the bottom hole static pressure;

[0052] P=ρg(HH slev )

[0053] Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

[0054] Step S230, when a leakage condition occurs in the oil well, the leakage time point is determined, and the corresponding bottom hole static pressure is obtained according to the annular space liquid level parameter, drilling fluid density parameter and well depth parameter at the leakage time point.

[0055] The embodiment of the present invention continuously collects drilling-related data at various time points (drilling-related data include annulus liquid level parameters, drilling fluid density parameters and well depth parameters), can continuously calculate the bottom hole static pressure, and realize dynamic monitoring of the bottom hole static pressure. When an oil well leaks, the bottom hole pressure at the time of the leak can be quickly obtained, thereby providing data support for the staff's subsequent handling.

[0056] Embodiment 3: As attached Figure 3 As shown, the embodiment of the present invention discloses a bottom hole dynamic pressure acquisition device based on annular space liquid level measurement, comprising:

[0057] The real-time acquisition unit collects the drilling related data at each time point in real time, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters.

[0058] The above-mentioned real-time acquisition unit comprises:

[0059] The acquisition control module receives drilling related data at each time point, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters;

[0060] The first acquisition module uses a wellbore liquid level monitor to collect annular space liquid level parameters at each time point;

[0061] The second acquisition module uses a comprehensive logging instrument or a drilling parameter instrument to collect the drilling fluid density parameters and well depth parameters at each time point.

[0062] The pressure acquisition unit acquires the bottom hole static pressure at the corresponding time point based on the drilling related data, and completes the dynamic monitoring of the bottom hole static pressure;

[0063] P=ρg(HH slev )

[0064] Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

[0065] The retrospective acquisition unit determines the time point of leakage when the oil well experiences leakage, and obtains the corresponding bottom hole static pressure according to the annular space liquid level parameter, drilling fluid density parameter and well depth parameter at the time point of leakage.

[0066] Embodiment 4: The embodiment of the present invention discloses a storage medium, on which a computer program readable by a computer is stored, and the computer program is configured to execute a method for acquiring bottom hole dynamic pressure based on annular space liquid level measurement when running.

[0067] The above storage medium may include, but is not limited to: a USB flash drive, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk, and other media that can store computer programs.

[0068] Embodiment 5: The embodiment of the present invention discloses an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement a method for acquiring bottom hole dynamic pressure based on annular space liquid level measurement.

[0069] The processor may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. It may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The memory may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk.

[0070] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0071] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A method for obtaining bottom hole dynamic pressure based on annular space liquid level measurement, characterized in that: include: Real-time collection of drilling-related data at each time point, including annular liquid level parameters, drilling fluid density parameters and well depth parameters; Based on the drilling related data, the bottom hole static pressure at the corresponding time point is obtained to complete the dynamic monitoring of the bottom hole static pressure; P=ρg(HH slev ) Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

2. The method for obtaining bottom hole dynamic pressure based on annular liquid level measurement according to claim 1, characterized in that: The real-time acquisition of drilling related data at each time point includes: Use the wellbore liquid level monitor to collect the annular liquid level parameters at each time point; The drilling fluid density parameters and well depth parameters at each time point are collected using a comprehensive logging instrument or a drilling parameter instrument.

3. The method for obtaining bottom hole dynamic pressure based on annular liquid level measurement according to claim 1 or 2, characterized in that: The method also includes determining the time point of leakage when the oil well experiences leakage, and obtaining the corresponding bottom hole static pressure according to the annular space liquid level parameter, drilling fluid density parameter and well depth parameter at the time point of leakage.

4. A device for acquiring bottom hole dynamic pressure based on annular liquid level measurement using the method as claimed in any one of claims 1 to 3, characterized in that: include: A real-time acquisition unit collects drilling-related data at each time point in real time, wherein the drilling-related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters; The pressure acquisition unit acquires the bottom hole static pressure at the corresponding time point based on the drilling related data, and completes the dynamic monitoring of the bottom hole static pressure; P=ρg(HH slev ) Where P is the hydrostatic pressure; g is the gravitational acceleration; ρ is the drilling fluid density parameter; H is the well depth parameter; H slev is the annulus liquid level parameter.

5. The device for acquiring bottom hole dynamic pressure based on annular space liquid level measurement according to claim 4, characterized in that: It also includes a retrospective acquisition unit, which determines the leakage time point when the oil well has leakage conditions, and obtains the corresponding bottom hole static pressure according to the annular space liquid level parameters, drilling fluid density parameters and well depth parameters at the leakage time point.

6. The device for acquiring bottom hole dynamic pressure based on annular liquid level measurement according to claim 4 or 5, characterized in that: The real-time acquisition unit comprises: The acquisition control module receives drilling related data at each time point, wherein the drilling related data includes annular space liquid level parameters, drilling fluid density parameters and well depth parameters; The first acquisition module uses a wellbore liquid level monitor to collect annular space liquid level parameters at each time point; The second acquisition module uses a comprehensive logging instrument or a drilling parameter instrument to collect the drilling fluid density parameters and well depth parameters at each time point.

7. A storage medium, characterized in that: The storage medium stores a computer program that can be read by a computer, and the computer program is configured to execute the method for acquiring bottom hole dynamic pressure based on annular space liquid level measurement as described in any one of claims 1 to 3 when running.

8. An electronic device, characterized in that: It comprises a processor and a memory, wherein a computer program is stored in the memory, and the computer program is loaded and executed by the processor to implement the method for acquiring bottom hole dynamic pressure based on annular space liquid level measurement as described in any one of claims 1 to 3.

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