Probe, system and method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe

Abstract

The present invention provides a probe, system, and method for detecting the position of a pipe string change in a high-pressure sealed metal pipe. The probe includes a coil bobbin, a metal core, a first coil, a second coil, and a third coil. The coil bobbin has a hollow cavity, a first winding area arranged circumferentially, and second winding areas arranged at both ends. The metal core is mounted in the cavity. The first coil and the second coil are wound around the first winding area in an overlapping manner. The first coil is configured as a transmitting coil; the second coil is configured as a receiving coil for acquiring a position signal of the pipe string change in a direction perpendicular to a first central axis. The third coil is wound around the second winding area and configured as a receiving coil for acquiring a position signal of the pipe string change in a direction perpendicular to a second central axis. The present invention can measure signals from different directions, thereby meeting the requirement for detecting whether the oil pipe is centered in the wellhead assembly and capable of measuring more complex test environments.

Description

Technical Field

[0001] The present invention relates to the fields of wellhead testing and petroleum logging in the petroleum industry, and in particular to a probe for detecting the diameter-changing position of a tubular column in a high-pressure sealed metal tube, a system for detecting the diameter-changing position of a tubular column in a high-pressure sealed metal tube, and a method for detecting the diameter-changing position of a tubular column in a high-pressure sealed metal tube. Background Art

[0002] Pressure operation refers to an advanced operation method in which operations such as pulling in and out tubing and drill pipes are performed in the wellbore with the help of pressure operation equipment when there is pressure in the wellhead of an oil, gas or water well. During the operation, there is no need to kill the well, release the blowout, or relieve the pressure. Production can be carried out while the operation is in progress, and the killing fluid can be prevented from contaminating the oil and gas layer. It has the advantages of protecting the oil and gas layer, maintaining the formation energy, shortening the operation cycle, and zero pollution. It is conducive to energy conservation and emission reduction, maintaining high and stable production of oil and gas wells, and ensuring efficient, green development and clean production of oil and gas fields. Pressure operation uses the working annular blowout preventer rubber core or the working gate valve of the gate valve blowout preventer to seal the annular space between the tubing string and the inner cavity of the wellhead device, and uses the internal plugging tool to achieve the plugging inside the tubing string. The pressure operation equipment applies an upward or downward force to pull in and out the tubing string in the well.

[0003] During pressure operations, it is crucial to obtain the position of the pipe diameter change within the high-pressure sealed metal pipe, i.e., the wellhead device. This can effectively prevent the fixed-size gate blowout preventer from closing on an incompatible pipe diameter change, or the pipe diameter change (such as couplings, tools, joints, etc.) from colliding with the blowout preventer gate that is in a closed, sealed, and pressurized state, causing an unexpected release of pressure and a safety accident. When the wellbore pipe is pulled out without accurately knowing its structure and size, and the pipe is in a high-pressure sealed state, the operator cannot directly obtain the specific position and size of the pipe diameter change from the outside. Therefore, a device is needed that can accurately detect the specific position of the pipe change and the speed of movement within the wellhead high-pressure sealed pipe.

[0004] Currently, there are four main methods used at wellsites to determine the position of tubing tapers. One relies on experience and data estimation to determine the tubing taper position and guide operators' actions, thereby determining whether to close the ram BOP. This method is both inefficient and inaccurate, and is only suitable when the tubing taper and data are accurate. When the tubing data is inaccurate or the tubing structure is incorrect (such as when the original well tubing is lost or incorrect), relying on experience to guide operations can easily cause the ram BOP to close at an incompatible tubing taper or for tubing tapers (such as couplings, tools, and joints) to collide with the closed, sealed, and pressurized BOP ram, causing safety and well control incidents. The second method uses a mechanical elastic roller inside a high-pressure sealing tube to determine the tubing taper position. This method is prone to damage when using tools with oversized diameters and struggles to meet corrosion, sulfur resistance, and high-pressure sealing requirements. The third method is to isolate the high-pressure area through high-pressure sapphire glass, and then install a camera behind it. This method cannot display intuitively and clearly when encountering turbid media (such as mud, high-viscosity liquid, etc.). At the same time, the high pressure that sapphire glass can withstand is limited, and currently it can only meet operations within 35MPa. The fourth method is to use automated equipment to detect the diameter change position of the pipe string, and identify the diameter change position of the pipe string through electromagnetic signal detection. This electromagnetic signal detection technology mainly uses a single-probe electromagnetic coil to intelligently record a single curve, which can roughly identify the position of the wellhead pipe string diameter change in a certain direction. However, the signal is weak and easily interfered by pipe string vibration, collision, etc., and it cannot detect whether the oil pipe is centered, thus failing to meet the production needs of high-pressure risk pressure operations in complex environments.

[0005] For example, a patent document entitled "Mechanical tubular string diameter change detection device" and published with publication number CN101906962A on December 8, 2010, describes a mechanical detection device, in which two groups of detection mechanisms consisting of three detection components are arranged in an upper and lower manner in the body, and the three detection components are evenly distributed along the circumference of the body; the detection components include a detection roller, a throttle shaft, a push rod, a cylinder body and a reversing valve, etc. A patent document entitled "A device for visually monitoring the tubular string inside the wellhead" and published with publication number CN 212296344 U on January 5, 2021, describes a visual monitoring device, including a shell and an image acquisition device, wherein a tubular string channel is provided in the shell, and the tubular string channel is used for the passage of an oil pipe / drill pipe or a downhole tool, and the image acquisition device is arranged in a sealed cavity of the shell and is used to image the inside of the wellhead. The patent document entitled "Pipeline Variable Diameter Detection Device" and published on January 22, 2021 with publication number CN 212389330U describes a pipe coupling detection device, including a center pipe and an electromagnetic detection component. The electromagnetic detection component includes a power supply, a control module, a spiral coil and a Gaussian measuring device. The spiral coil is installed on the circumferential outside of the center pipe, the power supply is connected to the spiral coil through a connecting line, the control module is arranged on the connecting line, and the Gaussian probe of the Gaussian measuring device is arranged between the spiral coil and the center pipe.

[0006] Although these pipe diameter change detection devices all have the function of identifying pipe diameter changes, they cannot simultaneously meet the detection difficulties of high pressure (such as 140MPa), large diameter, sulfur resistance, corrosion resistance, turbid media, high recognition, corrosion and scaling pipes, and have not established a dynamic connection with the pipe diameter change movement distance, so they cannot fully meet the detection needs in complex on-site environments. Summary of the Invention

[0007] The present invention aims to address at least one of the aforementioned deficiencies in the prior art. For example, one of the objectives of the present invention is to address the problem that existing pipe diameter change detection probes have weak measurement signals, can only detect the position of the pipe diameter change in a single direction (for example, can only obtain position information of the pipe diameter change on the x-axis and y-axis, but not on the z-axis), cannot effectively eliminate the electromagnetic interference caused by the protective sleeve, and thus have low accuracy in identifying the pipe diameter change inside the protective sleeve.

[0008] Another object of the present invention is to solve the problem that the existing pipe diameter change detection device cannot accurately, effectively and efficiently identify the pipe diameter change position in complex environments such as high pressure (such as 140MPa), large diameter, sulfur resistance, corrosion resistance, turbid media, high recognition, corrosion and scaling pipes, and perform real-time dynamic detection and alarm.

[0009] In order to achieve the above object, the present invention provides a probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe. The probe includes a coil skeleton, a metal core, a first coil, a second coil and a third coil, wherein:

[0010] The cross section of the coil skeleton is in an I-shape and has a hollow cavity, a first winding area arranged in the circumferential direction, and second winding areas arranged at both ends;

[0011] The metal core is installed in the cavity, and the radial dimension of the metal core is smaller than or equal to the radial dimension of the cavity;

[0012] The first coil and the second coil are wound in an overlapping manner on the first winding area, the first coil is configured as a transmitting coil for transmitting electromagnetic pulses; the second coil is configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe string diameter change in a direction perpendicular to the first central axis of the second coil;

[0013] The third coil is wound on the second winding area and is configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe string diameter change in a direction perpendicular to the second central axis of the third coil.

[0014] In an exemplary embodiment of a probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, the outer diameter of the first coil may be 1 to 5 mm, and the number of winding turns may be 500 to 200 turns; the outer diameter of the second coil may be 0.1 to 1 mm, and the number of winding turns may be 500 to 2500 turns; the outer diameter of the third coil may be 0.5 to 1 mm, and the number of winding turns may be 400 to 800 turns.

[0015] In an exemplary embodiment of the probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, the second coil may be wound around the outside of the first coil.

[0016] In an exemplary embodiment of the probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, one end surface of the coil skeleton can be configured as an arc surface matching the outer diameter of the wellbore.

[0017] In an exemplary embodiment of the probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, a plurality of winding grooves may be provided on the second winding area.

[0018] In an exemplary embodiment of a probe for detecting the diameter change position of a pipe column in a high-pressure sealed metal pipe of the present invention, the material of the coil skeleton may be nylon or rubber, the material of the metal core may be silicon steel, and the first coil, the second coil and the third coil may all be outer insulating paint-foiled copper wire.

[0019] Another aspect of the present invention provides a system for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe, the system comprising a plurality of probes as described above, and the plurality of probes can form at least one set of transverse detection devices and at least one set of longitudinal detection devices, wherein:

[0020] Each set of transverse detection devices includes two probes symmetrically distributed along the central axis of the wellbore and in a first installation state. In the first installation state, the second central axis of the probe is perpendicular to the central axis of the wellbore;

[0021] Each group of longitudinally arranged detection devices includes two probes symmetrically distributed along the central axis of the wellbore and in a second installation state. In the second installation state, the second central axis of the probe is parallel to the central axis of the wellbore.

[0022] In an exemplary embodiment of the system for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, the at least one group of transversely arranged detection devices and the at least one group of longitudinally arranged detection devices may be equidistantly distributed along the circumference of the wellbore.

[0023] In an exemplary embodiment of the system for detecting the diameter change position of the metal inner pipe string of a high-pressure sealed pipe of the present invention, the total number of the probes provided may be 4 to 32.

[0024] Another aspect of the present invention provides a method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe, using the above-mentioned probe to dynamically detect the diameter change of the pipe string in the wellbore to identify the spatial position of the pipe string diameter change.

[0025] In an exemplary embodiment of the method for detecting a diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention, the method may include:

[0026] A probe is placed horizontally on the outer wall of the wellbore to test the position signal of the pipe coupling in the x-axis and y-axis directions, and another probe is placed vertically on the outer wall of the wellbore to test the position signal of the pipe coupling in the y-axis and z-axis directions;

[0027] Each probe first emits a current for t1 milliseconds, then records the value every Δt milliseconds. After accumulating the record for t2 milliseconds, the current is emitted and the value is recorded again, and finally the axial position information of the pipe coupling in the x, y, and z directions over time is obtained.

[0028] In an exemplary embodiment of the method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention, the method further comprises the following steps:

[0029] The plurality of probes are assembled into at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices, and the magnetic polarity of each probe is tested, with each probe facing the wellhead device with magnetic N or S polarity;

[0030] Taking due north as the starting point, at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices are arrayed in the circumferential direction of the wellhead assembly, wherein each group of transversely arranged detection devices includes two probes symmetrically distributed along the wellbore central axis and installed perpendicularly to the second central axis, and each group of longitudinally arranged detection devices includes two probes symmetrically distributed along the wellbore central axis and installed parallel to the second central axis;

[0031] Each probe first emits a current for t1 milliseconds, then records the value every Δt milliseconds. After accumulating the record for t2 milliseconds, the current is emitted and the value is recorded again. Finally, the axial diameter change position information of the pipe coupling in the x, y, and z directions over time is obtained.

[0032] In an exemplary embodiment of the method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe of the present invention, t1 can be set to 50-200 ms, t2 can be set to 50-600 ms, and Δt can be set to 1-50 ms.

[0033] In an exemplary embodiment of the method for detecting the diameter change position of the tubing string in a high-pressure sealed metal tube of the present invention, the probe can be used to dynamically detect the tubing body and / or other drilling and workover tools in the wellbore to obtain the spatial position of the tubing body and / or other drilling and workover tools.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] (1) The detection system of the present invention can effectively obtain the diameter change position information of the pipe string (such as the pipe string coupling, the oil pipe body or other drilling and workover tools) in the x-axis, y-axis and z-axis directions, and can record multiple curves of the pipe string diameter change position, thereby effectively solving the problem of weak signal and single measurement direction during measurement, and improving the accuracy of pipe string diameter change position identification;

[0036] (2) The detection system of the present invention can perform three-axis and four-dimensional measurement of the diameter change position of the pipe string axially over time, and obtain the real-time position parameters of the pipe string diameter change in a high-pressure (for example, a pressure of 70 to 140 MPa) sealed metal pipe. This not only provides operators with more and more reliable signal information in real time, but also realizes high-precision dynamic real-time detection of the pipe string diameter change position;

[0037] (3) The present invention can measure signals from different directions, thereby meeting the requirement of detecting whether the oil pipe is centered in the wellhead device;

[0038] (4) The present invention can install an electromagnetic detection probe outside any high-pressure sealed metal pipe without contacting the high-pressure medium in the high-pressure sealed pipe and without changing the pressure-bearing components, thereby meeting all high-pressure, corrosion-resistant, and sulfur-resistant requirements and avoiding the impact of pipe column corrosion and scaling on the detection of pipe column diameter change positions;

[0039] (5) The present invention is not affected by the contact with high-pressure media (such as well mud, crude oil, and natural gas) in the high-pressure sealed tube, and can detect the position where the pipe string changes diameter in any turbid medium condition;

[0040] (6) The present invention can detect the size of the pipe string, the size of the reducing component, etc.;

[0041] (7) The detection system of the present invention can be used in conjunction with control equipment to replace traditional manual operation methods and realize the automation of pressurized operations at the well site. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other objects and / or features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0043] Figure 1 A schematic structural diagram of a coil bobbin of an exemplary embodiment of a probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention is shown.

[0044] Figure 2 A cross-sectional view of a coil bobbin of an exemplary embodiment of a probe for detecting a diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention is shown.

[0045] Figure 3 A schematic diagram shows the arrangement of a transverse probe and a longitudinal probe on the outer wall of a wellbore of an exemplary embodiment of a system for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention.

[0046] Figure 4 A schematic diagram showing the array distribution of detection probes of an exemplary embodiment of a system for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention is shown.

[0047] Description of reference numerals:

[0048] 1-first winding area, 2-second winding area, 3-winding groove. DETAILED DESCRIPTION

[0049] Hereinafter, a probe, a system and a method for detecting a diameter change position of a pipe string in a high-pressure sealed metal pipe according to the present invention will be described in detail with reference to exemplary embodiments and the accompanying drawings.

[0050] It should be noted that terms such as "first," "second," and "third" are used solely for ease of description and distinction and should not be construed as indicating or implying relative importance. Terms such as "horizontal," "vertical," "inner," and "outer" are used solely for ease of description and to establish relative orientations or positions, and do not indicate or imply that the components referred to must have a specific orientation or position.

[0051] The physical basis of electromagnetic probes is Faraday's law of electromagnetic induction. Direct current (DC) is applied to the transmitting coil, generating a stable magnetic field around the helical tube. This field induces current in the tubing and casing. When the DC current is removed, this induced current generates an induced electromotive force (ε) in the receiving coil that decays over time. This induced electromotive force (ε) changes with pipe thickness or defects. Analysis and calculation can identify downhole tubing structure and tool position.

[0052] Typically, the industry utilizes single-probe electromagnetic coils and other methods to inspect the tubing, wellhead tubing couplings, and other tools inside the wellhead. However, the coil-based probes of traditional instruments can only detect signals in a single direction, and these signals are weak. They cannot effectively identify the wellhead coupling from different directions, and therefore cannot detect whether the tubing is centered within the wellhead flange. Furthermore, traditional pressurized operations at the casing coupling often involve cutting the pipeline, inserting, fitting, installing, and semi-fixing various sensors. This not only results in complex wiring, high dispersion, and high cost, but also disrupts the wellbore's sealing due to cutting the pipeline, making it difficult to perform pressurized operations.

[0053] After research, the inventors discovered that the electromagnetic induction coil is the main component of the intelligent wellhead visualization detection device, and the skeleton structure, winding method and array distribution of the coil probes are all key to the intelligent wellhead visualization detection device. Therefore, solving the problems of skeleton structure and coil winding, as well as the array distribution of coil probes has always been the primary task in the design of the wellhead pressure operation visualization detection device.

[0054] In order to achieve the above-mentioned object, the present invention provides, on one hand, a probe for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe.

[0055] In an exemplary embodiment of the present invention, a probe for detecting a diameter change position of a pipe string in a high-pressure sealed metal pipe may include a coil bobbin, a metal core, a first coil, a second coil, and a third coil.

[0056] The cross-section of the coil skeleton is I-shaped and has a hollow cavity, a first winding area arranged in the circumferential direction, and a second winding area arranged at both ends. The metal core is installed in the cavity, and the radial dimension of the metal core is less than or equal to the radial dimension of the cavity. The first coil and the second coil are wound on the first winding area in an overlapping manner. The first coil is configured as a transmitting coil for transmitting electromagnetic pulses. The second coil is configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe column diameter change in a direction perpendicular to the first central axis of the second coil. The third coil is wound on the second winding area and is configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe column diameter change in a direction perpendicular to the second central axis of the third coil.

[0057] After adopting the above structure, the beneficial effect produced by the detection probe of the present invention is: two axial signals can be detected and obtained simultaneously through one detection probe, and the position signals do not affect each other, effectively solving the problem of weak signal and single measurement direction during measurement.

[0058] In this embodiment, the outer diameter of the first coil can be 1 to 5 mm, and the number of winding turns can be 500 to 200 turns; the outer diameter of the second coil can be 0.1 to 1 mm, and the number of winding turns can be 500 to 2500 turns; the outer diameter of the third coil can be 0.5 to 1 mm, and the number of winding turns can be 400 to 800 turns.

[0059] In this embodiment, there are two winding methods for the first and second coils. Winding method one is to wind the first coil around the outside of the second coil. Specifically, external insulating varnished copper wire with an outer diameter of 0.1mm to 1mm is evenly wound around the circumference of the coil bobbin for 500 to 2500 turns to form the second coil. Then, external insulating varnished copper wire with an outer diameter of 1mm to 5mm is evenly wound around the outside of the second coil for 500 to 2000 turns to form the first coil. Winding method two is to wind the second coil around the outside of the first coil. Specifically, external insulating varnished copper wire with an outer diameter of 1mm to 5mm is evenly wound around the circumference of the coil bobbin for 500 to 2000 turns to form the first coil. Then, external insulating varnished copper wire with an outer diameter of 0.1mm to 1mm is evenly wound around the outside of the first coil for 500 to 2500 turns to form the second coil.

[0060] It should be noted that winding method 2 is the optimal winding solution. This is because the first coil, as the transmitting coil, has a large diameter and is easy to arrange neatly, while the second coil, as the receiving coil, has a small diameter and is difficult to arrange neatly. When the first coil is arranged inside the second coil, it can simultaneously ensure the signal stability of the transmitting coil and the receiving coil, which is conducive to eliminating unnecessary electromagnetic signal interference.

[0061] In this embodiment, one end face of the coil bobbin can be configured as an arc surface that matches the outer diameter of the wellbore. The purpose of configuring one end of the coil bobbin as an arc surface is to match the arc surface of the outer wall of the wellbore, thereby enabling close contact with the pipe string to change diameter and enhance measurement accuracy.

[0062] In this embodiment, a plurality of winding grooves may be provided on the second winding area for fixing the winding position of the third coil.

[0063] In this embodiment, the material of the coil skeleton can be nylon or rubber with good insulation, the material of the metal core can be silicon steel, and the first coil, the second coil and the third coil can all be outer insulating paint-foiled copper wire.

[0064] Another aspect of the present invention provides a system for detecting the diameter change position of a pipe column in a high-pressure sealed metal pipe.

[0065] In another exemplary embodiment of the present invention, a system for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe may include a plurality of detection probes as described above, and the plurality of detection probes can form at least one group of transverse detection devices and at least one group of longitudinal detection devices. Each group of transverse detection devices includes two detection probes symmetrically distributed along the central axis of the wellbore and in a first installation state. In the first installation state, the second central axis of the third coil on the detection probe is perpendicular to the central axis of the wellbore; each group of longitudinal detection devices includes two detection probes symmetrically distributed along the central axis of the wellbore and in a second installation state. In the second installation state, the second central axis of the third coil on the detection probe is parallel to the central axis of the wellbore. The transverse detection device is used to observe the diameter change of the pipe string transversely, and the longitudinal detection device is used to observe the diameter change of the pipe string longitudinally.

[0066] In this embodiment, at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices can be equally spaced along the circumference of the wellbore. The total number of detection probes can be 4 to 32.

[0067] It should be noted that the tubing reducer may refer to the tubing coupling (ie, tubing coupling) in the wellbore, the tubing body, or other drilling and workover tools.

[0068] Another aspect of the present invention provides a method for detecting a diameter-changing position of a pipe column in a high-pressure sealed metal pipe.

[0069] In yet another exemplary embodiment of the present invention, the above detection probe may be used to dynamically detect the diameter change of the tubular string in the wellbore to identify the spatial position of the tubular string diameter change.

[0070] For example, a method for detecting a diameter change position of a pipe string in a high-pressure sealed metal pipe may include:

[0071] (1) A detection probe is horizontally set on the outer wall of the wellbore to test the position signal of the pipe coupling in the x-axis direction and the y-axis direction, and another detection probe is vertically set on the outer wall of the wellbore to test the position signal of the pipe coupling in the y-axis direction and the z-axis direction.

[0072] (2) Each detection probe first emits a current for t1 milliseconds, then records the value every Δt milliseconds. After accumulating the value for t2 milliseconds, the current is emitted again and the value is recorded again. Finally, the axial position information of the pipe coupling in the x, y, and z axes over time is obtained. t1 can be set to 100ms, t2 can be set to 300ms, and Δt can be set to 1ms.

[0073] This method can effectively obtain the position information of the pipe coupling in the x-axis, y-axis and z-axis directions, and can record multiple curves of the pipe coupling position, thereby effectively solving the problem of weak signal and single measurement direction during measurement and improving the accuracy of pipe coupling position identification.

[0074] For another example, a method for detecting a diameter change position of a pipe string coupling in a high-pressure sealed pipe may include the following steps:

[0075] (1) A plurality of detection probes are organized into at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices, and the magnetic polarity of each detection probe is tested, with the magnetic N or S polarity facing the wellhead device.

[0076] (2) With due north as the starting point, at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices are arrayed in the circumferential direction of the wellhead device. Each group of transversely arranged detection devices includes two detection probes symmetrically distributed along the central axis of the wellbore and installed along the second central axis in a direction perpendicular to the central axis of the wellbore; each group of longitudinally arranged detection devices includes two detection probes symmetrically distributed along the central axis of the wellbore and installed along the second central axis in a direction parallel to the central axis of the wellbore.

[0077] (3) Each detection probe first emits a current for t1 milliseconds, then records the value every Δt milliseconds. After accumulating the value for t2 milliseconds, the current is emitted again and the value is recorded again. Finally, the position information of the tubing coupling in the x, y, and z axes over time is obtained. Among them, t1 can be set to 50-200 ms, t2 can be set to 50-600 ms, and Δt can be set to 1-50 ms.

[0078] This method can not only perform three-axis and four-dimensional measurement of the tubing coupling position axially over time, and obtain the real-time position parameters of the tubing coupling in a high-pressure (for example, a pressure of 70 to 140 MPa) sealed pipe, but also meet the requirements of detecting whether the oil pipe is centered in the wellhead device (such as the wellhead flange), and can measure more complex test environments.

[0079] In addition, the detection probe can be used to perform dynamic detection on the oil pipe body and / or other drilling and workover tools in the wellbore to obtain the spatial position of the oil pipe body and / or other drilling and workover tools.

[0080] In order to better understand the above exemplary embodiments of the present invention, they are further described below with reference to the accompanying drawings and specific examples.

[0081] Example 1

[0082] An electromagnetic induction detection probe consists of a coil skeleton, a metal core, an x-axis coil (ie, a second coil), a y-axis coil (ie, a first coil), and a z-axis coil (ie, a third coil).

[0083] like Figure 1 As shown, the coil bobbin is hollow, with its ends and center forming an I-shape. One end face of the coil bobbin is a circular arc, while the other end face is a parallel, corresponding surface. The circular arc of one end face of the coil bobbin aligns with the circular arc of the wellbore's outer wall, ensuring close contact with the tubing coupling and enhancing measurement accuracy.

[0084] like Figure 1 and Figure 2 As shown, the middle portion of the coil frame is a first winding area 1 for winding the x-axis coil and the y-axis coil, and the two end surfaces of the coil frame are second winding areas 2 for winding the z-axis coil.

[0085] like Figure 1 and Figure 2 As shown, a plurality of winding grooves 3 are provided on the two end surfaces of the coil frame (ie, the second winding area) for winding and fixing the z-axis coil.

[0086] The x-axis coil, y-axis coil, and z-axis coil are wound on the coil bobbin as follows: First, use 1mm outer diameter copper wire, evenly wound 500 times in the middle of the coil bobbin (the first winding area), to form the y-axis coil. Then, use 0.1mm outer diameter copper wire, evenly wound 500 times in the y-axis coil, to form the x-axis coil. Finally, use 0.5mm outer diameter copper wire, evenly wound 400 times in the winding grooves at both ends of the coil bobbin (the second winding area), to form the z-axis coil. The y-axis coil is set as the transmitting coil, and the x-axis and z-axis coils are set as the receiving coils.

[0087] The metal core is made of non-magnetic silicon steel, and a circumferential coil bobbin is placed on top of the non-magnetic silicon steel core. The coil bobbin is made of nylon, which has excellent insulation properties. Its cross-section is square, which allows the non-magnetic silicon steel core to be firmly and stably fixed, providing excellent shock absorption.

[0088] In this example, the magnetic induction detection probe can be used to test and obtain position signals of the pipe collar in the x-axis, y-axis, and z-axis directions. The method for using the detection probe may include the following steps:

[0089] (1) Prepare two detection probes as described above, use one of the detection probes as a transverse probe, and set it on the outer wall of the wellbore along the direction perpendicular to the z-axis coil and the central axis of the wellbore (that is, set it transversely), so as to test the position signals of the pipe coupling in the x-axis direction and the y-axis direction; use the other detection probe as a longitudinal probe, and set it on the outer wall of the wellbore along the direction parallel to the z-axis coil and the central axis of the wellbore (that is, set it longitudinally), so as to test the position signals of the pipe coupling in the y-axis direction and the z-axis direction.

[0090] Figure 3 The figure is a schematic diagram of the arrangement of the transverse probe and the longitudinal probe on the outer wall of the wellbore. Figure 3 As shown, one detection probe is a longitudinal probe T1, which is arranged longitudinally on the outer wall of the wellbore so that the magnetic lines of force generated by the z-axis coil wound on the longitudinal probe T1 are parallel to the z-axis direction of the wellbore. This allows the z-axis coil wound on the longitudinal probe T1 to measure the position signal of the tubular collar in the z-axis direction, while the x-axis coil wound on the longitudinal probe T1 can measure the position signal of the tubular collar in the x-axis direction. The other detection probe is a transverse probe T2, which is arranged transversely on the outer wall of the wellbore so that the magnetic lines of force generated by the z-axis coil wound on the transverse probe T2 are perpendicular to the z-axis direction of the wellbore. This allows the z-axis coil wound on the transverse probe T2 to measure the position signal of the tubular collar in the y-axis direction, while the x-axis coil wound on the transverse probe T2 can measure the position signal of the tubular collar in the z-axis direction.

[0091] (2) Each detection probe first emits a current for 100ms, then records the value every 1ms, accumulates and records the measured values ​​at 1ms intervals from 0 to 300ms, and then repeats the current emission for 100ms and records the value again. This cycle of testing is repeated to finally obtain the axial position information of the pipe coupling in the x, y, and z axes over time. It should be noted that the cumulative recording time of each detection probe is related to the detection distance. When the detection distance is short, the cumulative recording time is short, and when the detection distance is long, the cumulative recording time is long.

[0092] Example 2

[0093] A system for detecting the position of a pipe collar within a high-pressure sealed metal pipe can include a set of transversely arranged detection devices and a set of longitudinally arranged detection devices. These devices are arranged in an array around the outer circumference of a wellhead assembly. This array arrangement of detection devices can create a magnetic focus at the center of the wellhead flange, amplifying the detection signal and enabling effective signal measurement even in complex situations.

[0094] The horizontally arranged detection device comprises the two horizontal probes described in Example 1, which are symmetrically distributed along the central axis of the wellhead assembly. The vertically arranged detection device comprises the two vertical probes described in Example 1, which are symmetrically distributed along the central axis of the wellhead assembly. The horizontally arranged detection device and the vertically arranged detection device are equidistantly distributed along the circumference of the wellbore.

[0095] The detection system can not only measure the position information of the tubing coupling on the x-axis, y-axis and z-axis, but also integrate the position information detected by the four detection probes to determine whether the tubing coupling is located in the center position of the wellhead assembly.

[0096] Of course, the detection system can also include multiple sets of horizontally arranged detection devices and multiple sets of vertically arranged detection devices to dynamically detect the oil pipe body, pipe couplings, and other tools inside the wellhead before they exit the wellhead to prevent damage to the pressure-operated machine. For example, the north direction can be used as the starting point, and according to the different diameters of the tested objects and the test accuracy requirements, the probes can be distributed in the order of 4, 6, 8, 12, 16, 18, 22, 26, 28, 30, and 32. That is, the total number of detection probes set can be 4 to 32. For a 5.5-inch lubricant preventer, the pipe string thickness is 8 to 10 mm, and a minimum of 4 small-sized detection probes and a maximum of 16 detection probes can be set; for a 7-inch lubricant preventer, the pipe string thickness is 10 to 15 mm, and a minimum of 4 detection probes and a maximum of 16 detection probes can be set; for a wellhead device, the pipe string thickness is 60 mm, and a minimum of 4 large-sized detection probes and a maximum of 16 large-sized detection probes or 32 small-sized detection probes can be set.

[0097] A method for detecting a diameter change position of a pipe string in a high-pressure sealed pipe comprises the following steps:

[0098] (1) 32 detection probes are organized into 8 groups of horizontally arranged detection devices and 8 groups of vertically arranged detection devices, and the magnetic polarity of each detection probe is tested, with the magnetic N or S polarity facing the wellhead device.

[0099] (2) With due north as the starting point, eight groups of transversely arranged detection devices and eight groups of longitudinally arranged detection devices are arrayed around the wellhead device. Each group of transversely arranged detection devices includes two transverse probes symmetrically distributed along the central axis of the wellbore, and each group of longitudinally arranged detection devices includes two longitudinal probes symmetrically distributed along the central axis of the wellbore. The transverse probes are attached to the outer wall of the wellbore in a direction in which the z-axis coils thereon are perpendicular to the central axis of the wellbore, and the longitudinal probes are attached to the outer wall of the wellbore in a direction in which the z-axis coils thereon are parallel to the central axis of the wellbore.

[0100] like Figure 4 As shown, with due north as the starting point, 32 self-emitting and self-retracting arc surface detection probes are evenly arranged on the circumference of the wellhead device to form a magnetic field focus and enhance the detection signal.

[0101] (3) Each detection probe first emits a current for 100ms, then records the value every 1ms, accumulates and records the measured values ​​at 1ms intervals from 0 to 300ms, and then repeats the current emission for 100ms and records the value again. The test is repeated in this way, and finally the position information of the tubing coupling in the x, y, and z axes over time is obtained to determine the spatial position of the tubing coupling in the wellhead device and whether it is centered.

[0102] In summary, the beneficial effects of the present invention include at least one of the following:

[0103] (1) The detection system of the present invention can effectively obtain the diameter change position information of the pipe string (such as the pipe string coupling, the oil pipe body or other drilling and workover tools) in the x-axis, y-axis and z-axis directions, and can record multiple curves of the pipe string diameter change position, thereby effectively solving the problem of weak signal and single measurement direction during measurement, and improving the accuracy of pipe string diameter change position identification;

[0104] (2) The detection system of the present invention can perform three-axis and four-dimensional measurement of the diameter change position of the pipe string axially over time, and obtain the real-time position parameters of the pipe string diameter change in a high-pressure (for example, a pressure of 70 to 140 MPa) sealed metal pipe. This not only provides operators with more and more reliable signal information in real time, but also realizes high-precision dynamic real-time detection of the pipe string diameter change position;

[0105] (3) The present invention can measure signals from different directions, thereby meeting the requirement of detecting whether the oil pipe is centered in the wellhead device;

[0106] (4) The present invention can install an electromagnetic detection probe outside any high-pressure sealed metal pipe without contacting the high-pressure medium in the high-pressure sealed pipe and without changing the pressure-bearing components, thereby meeting all high-pressure, corrosion-resistant, and sulfur-resistant requirements and avoiding the impact of pipe column corrosion and scaling on the detection of pipe column diameter change positions;

[0107] (5) The present invention is not affected by the contact with high-pressure media (such as well mud, crude oil, and natural gas) in the high-pressure sealed tube, and can detect the position where the pipe string changes diameter in any turbid medium condition;

[0108] (6) The present invention can detect the size of the pipe string, the size of the reducing component, etc.;

[0109] (7) The detection system of the present invention can be used in conjunction with control equipment to replace traditional manual operation methods and realize the automation of pressurized operations at the well site.

[0110] Although the present invention has been described above with reference to the exemplary embodiments and the accompanying drawings, it will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe, characterized in that: Use the probe to dynamically detect the diameter change of the pipe string in the wellbore to identify the spatial location of the pipe string diameter change; The probe includes a coil skeleton, a metal core, a first coil, a second coil and a third coil, wherein the cross section of the coil skeleton is I-shaped and has a hollow cavity, a first winding area arranged in the circumferential direction, and a second winding area arranged at both ends; the metal core is installed in the cavity, and the radial dimension of the metal core is less than or equal to the radial dimension of the cavity; the first coil and the second coil are wound on the first winding area in an overlapping manner, and the first coil is configured as a transmitting coil for transmitting electromagnetic pulses; the second coil is configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe column diameter change in a direction perpendicular to the first central axis of the second coil; the third coil is wound on the second winding area and configured as a receiving coil for receiving electromagnetic pulses to obtain a position signal of the pipe column diameter change in a direction perpendicular to the second central axis of the third coil; The method comprises: A probe is placed horizontally on the outer wall of the wellbore to test the pipe coupling. x Axis direction and y The position signal in the axial direction is obtained, and another probe is set longitudinally on the outer wall of the wellbore to test the position of the pipe coupling. y Axis direction and z Position signal in the axis direction; Each probe first emits current for t1 milliseconds, then records the value every Δt milliseconds, accumulates and records the value after t2 milliseconds, and then repeats the current emission and records the value, and finally obtains the axial movement of the pipe string collar over time. x 、 y 、 z Position information in three-axis directions; The method comprises the following steps: The plurality of probes are assembled into at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices, and the magnetic polarity of each probe is tested, with each probe facing the wellhead device with magnetic N or S polarity; Taking due north as the starting point, at least one group of transversely arranged detection devices and at least one group of longitudinally arranged detection devices are arrayed in the circumferential direction of the wellhead assembly, wherein each group of transversely arranged detection devices includes two probes symmetrically distributed along the wellbore central axis and installed perpendicularly to the second central axis, and each group of longitudinally arranged detection devices includes two probes symmetrically distributed along the wellbore central axis and installed parallel to the second central axis; Each probe first emits current for t1 milliseconds, then records the value every Δt milliseconds, accumulates and records the value after t2 milliseconds, and then repeats the current emission and records the value, and finally obtains the axial movement of the pipe string collar over time. x 、 y 、 z Position information in three axes.

2. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: t1 is set to 50~200ms, t2 is set to 50~600ms, and Δt is set to 1~50ms.

3. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: The probe is used to dynamically detect the tubing body and / or other drilling and workover tools in the wellbore to obtain the spatial positions of the tubing body and / or other drilling and workover tools.

4. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: The outer diameter of the first coil is 1-5 mm, and the number of winding turns is 500-200; the outer diameter of the second coil is 0.1-1 mm, and the number of winding turns is 500-2500; the outer diameter of the third coil is 0.5-1 mm, and the number of winding turns is 400-800.

5. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: The second coil is wound around the outside of the first coil.

6. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: One end face of the coil skeleton is configured as an arc surface matching the outer diameter of the wellbore.

7. The method for detecting the diameter change position of the pipe string in the high-pressure sealed metal pipe according to claim 1, characterized in that: A plurality of winding grooves are provided on the second winding area.

8. The method for detecting the diameter change position of a pipe string in a high-pressure sealed metal pipe according to claim 1, characterized in that: The coil frame is made of nylon or rubber, the metal core is made of silicon steel, and the first coil, the second coil and the third coil are all made of outer insulating varnish-foiled copper wire.

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