Automatic well repair internal and external dual-function oil pipe detection method

Abstract

The invention discloses an automatic well repair internal and external dual-function oil pipe detection method, which adopts a detection device and is implemented according to the following process: step 1, collecting data of magnetic flux leakage detection and transient electromagnetic eddy current detection; and 2, carrying out data arrangement, and giving a corresponding feedback result. The detection method disclosed by the invention has the advantages that 1) during automatic workover operation, two detection methods of magnetic flux leakage and transient electromagnetic eddy current are combined and adopted, so that the detection speed is ensured, and the oil pipe defect detection accuracy is also ensured; and 2) the magnetic flux leakage detection control unit can bear high pressure the same as that of automatic workover operation equipment, so that the use safety of the automatic workover operation equipment and the well control safety of a wellhead are guaranteed. And 3) the method can be used in linkage with automatic workover equipment, and can also be independently used in conventional workover operation.

Description

Technical Field

[0001] The invention belongs to the technical field of automated well repair in oil and gas fields, and relates to an automated well repair dual-function internal and external oil pipe detection method. Background Art

[0002] After the oil pipe operation, especially the production oil pipe that has been operated many times or placed in the wellbore for a long time, there will usually be defects such as cracks, holes, rust, wear and tear to varying degrees. These defects may cause leakage or even breakage of the oil pipe, which will greatly increase the cost of oil production. In order to eliminate the risk of such oil pipe defects, it is necessary to carry out downhole well repair operations and oil pipe defect detection.

[0003] The conventional method for detecting defects in tubing is to install the detector at the top of the wellhead device. When the tubing is lifted and lowered, the defects in the tubing are detected by direct contact with the outer wall of the tubing. When disassembling the tubing, connecting a single tubing, etc., the detector must repeatedly lift and lower the tubing string for detection. Only after the detection is completed can the disassembly of the tubing, connection of a single tubing, etc. be continued, which seriously affects the operating efficiency; at the same time, it is also easy to cause repeated measurement errors, blind spots, etc. Conventional tubing detection devices are usually installed at the top of the wellhead device, and are open during operation and cannot withstand wellbore pressure. During conventional well repair operations, manual identification of defective tubing is time-consuming and labor-intensive, easy to miss, and minor defects are difficult to detect. These problems are becoming increasingly prominent.

[0004] In addition, the existing well repair operation has long been an extensive operation mode. The well repair operation information and fault conditions can only rely on manual recording, and then judged, identified and processed based on human experience. It does not meet the basic needs of digital monitoring. The operation process lacks digital control. The automated equipment only has the system preset alarm function, and has no fault analysis and contingency processing function. Therefore, it is urgent to develop a method for detecting oil pipe defects in automated well repair equipment to improve the intelligent technology level of well repair equipment. Summary of the invention

[0005] The purpose of the present invention is to provide an automated well repair dual-function oil pipe detection method, which solves the problem that the existing methods for oil pipe defect detection are greatly limited and difficult to achieve highly integrated and efficient oil pipe defect detection.

[0006] The technical solution adopted by the present invention is an automated well repair dual-function oil pipe detection method, which adopts a detection device and is implemented according to the following process:

[0007] Step 1, collecting data of magnetic flux leakage detection and transient electromagnetic eddy current detection;

[0008] Step 2: Organize the data and give corresponding feedback results.

[0009] The beneficial effects of the present invention include the following aspects: 1) During the automated well repair operation, the two detection methods of magnetic flux leakage and transient electromagnetic eddy current are combined to ensure both the detection speed and the accuracy of the oil pipe defect detection. 2) The magnetic flux leakage detection control unit can withstand the same high pressure as the automated well repair operation equipment, ensuring the safety of the use of the automated well repair operation equipment and the well control safety of the wellhead. 3) The method of the present invention can be used in conjunction with the automated well repair equipment, and can also be used independently in conventional well repair operations, and has a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the detection process and tubing tripping operation used in Example 1 of the method of the present invention;

[0011] Figure 2 A schematic diagram of the structure of the detection device used in the method of the present invention;

[0012] Figure 3 This is a simplified diagram of the automated well repair data processing process of Example 1 of the method of the present invention;

[0013] Figure 4 This is a data process analysis diagram of Example 3 of the present invention.

[0014] In the figure, 1. magnetic flux leakage detection control unit, 2. mileage wheel, 3. contact probe, 4. transmitting coil bin, 5. magnetic flux leakage detection control cabinet, 6. transient electromagnetic eddy current detection control unit, 7. transient electromagnetic eddy current detection control cabinet, 8. transmitting-receiving coil bin, 10. oil pipe, 11. working platform, 12. wellhead device, 13. casing head. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Reference Figure 2 The detection device structure used in the method of the present invention includes a magnetic flux leakage detection control unit 1 and a transient electromagnetic eddy current detection control unit 6.

[0017] The structure of the magnetic flux leakage detection control unit 1 is as follows: it includes a magnetic flux leakage detection control cabinet 5, which is respectively connected to the mileage wheel 2, the contact probe 3, and the transmitting coil bin 4 by signals, wherein the mileage wheel 2, the contact probe 3, and the transmitting coil bin 4 surround the oil pipe 10 in sequence from top to bottom, that is, the contact probe 3 and the mileage wheel 2 are both in contact with the oil pipe to be detected; the magnetic flux leakage detection control unit 1 is located as a whole between two sections of wellhead devices 12 below the working platform 11 of the automated well repair machine, the upper end face of the mileage wheel 2 is connected to the lower end face of the wellhead device 12 of the upper section by a flange, and the lower end face of the transmitting coil bin 4 is connected to the upper end face of the wellhead device 12 of the lower section by a flange; the pressure level of the magnetic flux leakage detection control unit 1 is equivalent to the pressure level of the wellhead automation equipment;

[0018] The structure of the transient electromagnetic eddy current detection control unit 6 is that it includes a transient electromagnetic eddy current detection control cabinet 7, which is respectively connected to the transient electromagnetic annular probe and the transmitting-receiving coil compartment 8 for signal connection, and the transmitting-receiving coil compartment 8 and the transient electromagnetic annular probe are both covered on the outer wall of the casing head or the connecting short section, and are fixed to the outer wall of the casing head 13 or the connecting short section by a clamp;

[0019] The detection signal of the magnetic flux leakage detection control unit 1 is connected to the magnetic flux leakage detection control cabinet 5, and the detection signal of the transient electromagnetic eddy current detection control unit 6 is connected to the transient electromagnetic eddy current detection control cabinet 7. The magnetic flux leakage detection control cabinet 5 and the transient electromagnetic eddy current detection control cabinet 7 are both provided with local alarm devices, and the signals of the magnetic flux leakage detection control cabinet 5 and the transient electromagnetic eddy current detection control cabinet 7 are then connected to the remote control end; the magnetic flux leakage detection control cabinet 5 and the transient electromagnetic eddy current detection control cabinet 7 are integrated on the operating table of the automated well repairing machine, and both are linked to the automated well repairing system to perform data processing on the remote control end.

[0020] Reference Figure 1 The detection method of the present invention is based on the above detection device and is implemented according to the following process:

[0021] Step 1: Collect data from magnetic flux leakage detection and transient electromagnetic eddy current detection.

[0022] The contact probe 3 and the odometer wheel 2 of the magnetic flux leakage detection control unit 1 are both in reliable contact with the outer wall of the oil pipe, and the oil pipe defects are detected by contacting the contact probe 3, and the length of the oil pipe is measured by recording the rolling length of the odometer wheel 2; at the same time, the transient electromagnetic annular probe of the transient electromagnetic eddy current detection control unit 6 synchronously detects the defects of the oil pipe and records the number of oil pipes;

[0023] The detection signal of the magnetic flux leakage detection control unit 1 is connected to the magnetic flux leakage detection control cabinet 5, and the detection signal of the transient electromagnetic eddy current detection control unit 6 is connected to the transient electromagnetic eddy current detection control cabinet 7;

[0024] Step 2: Organize the data and give corresponding feedback.

[0025] The signals from the magnetic flux leakage detection control cabinet 5 and the transient electromagnetic eddy current detection control cabinet 7 are then connected to the remote control end for data processing. By comparing them with each other, accurate results of the oil pipe detection are obtained.

[0026] If the detection data exceeds the standard, the magnetic flux leakage detection control cabinet 5 or the transient electromagnetic eddy current detection control cabinet 7 will issue an alarm through the local alarm device. If the detection data is normal, the detection will continue.

[0027] In step 2, the data processing process of the remote control terminal includes three main steps: three-dimensional space coordinate conversion, array data interpolation and normalization, and three-dimensional point cloud coordinate conversion, which are specifically described as follows:

[0028] Step a: 3D space coordinate conversion.

[0029] The well circumference is divided into 32 irregular closed areas, and the annular area along the well circumference is mapped to a three-dimensional coordinate system according to the angles at which all the contact probes 3 are arranged; the ordinates of each detection point on the circular array are calculated according to the abscissa positions corresponding to the detection points of the annular array, and each detection point is connected to form a closed area corresponding to each detection point, thereby establishing a three-dimensional columnar structure;

[0030] Step b: interpolation and normalization of array data,

[0031] Reference Figure 3 First, read the original array data obtained by all contact probes 3, set the number of interpolation, calculate the magnification according to the original logging data and the length of the interpolated data, use the magnification to calculate the interval to which the interpolation point belongs in the original data, calculate the specific gravity parameter according to the distance between the interpolation point and the left and right endpoints of the interval, and then use the left and right endpoint values ​​of the interval and related parameters to solve the value of the interpolation point;

[0032] Then, vertical normalization is performed to map the induced electromotive force signals collected by the contact probe 3 at each depth to the range of 0-1, and the mapping values ​​corresponding to each depth after interpolation are calculated, so that each group of induced electromotive force information can be more intuitively identified under the same standard.

[0033] Step c: 3D point cloud coordinate conversion.

[0034] According to the columnar structure of the wellhead oil pipe, each depth layer is equivalent to a "cone" composed of several pixel points. Each pixel point is connected to the coordinate origin, and the ring is divided into multiple sectors. Combined with the detection data of the contact probe 3 corresponding to the area, the radius value corresponding to each pixel point is solved, and the radius matrix corresponding to the induced electromotive force is obtained to realize the three-dimensional point cloud coordinate conversion of the wellhead oil pipe.

[0035] Example 1

[0036] Reference Figure 3 According to the structure of the aforementioned detection device and the steps of the aforementioned method of the present invention, the following specific control process is used for detection:

[0037] 1) The magnetic flux leakage detection control unit 1 sends a periodic pulse magnetic field, and the four contact probes 3 (tunnel magnetoresistive sensors) distributed symmetrically in an annular shape extract and analyze the response voltage signal to identify the defects of the oil pipe;

[0038] 2) Measure the length of the oil pipe by recording the rolling length of the odometer wheel 2;

[0039] 3) The transient electromagnetic eddy current detection control unit 6 emits a 150ms DC pulse current, and the 36 contact probes 3 distributed in a circular symmetrical array are used to extract and analyze the response voltage signal to identify the defects of the oil pipe.

[0040] When the oil pipe is found to be defective during the detection, the local alarm devices of the magnetic flux leakage detection control cabinet 5 and the transient electromagnetic eddy current detection control cabinet 7 can both emit an alarm sound and display an interface prompt, and at the same time, upload the data to the remote control terminal.

[0041] Example 2

[0042] The detection device and detection method process are similar to those used in Example 1, except that:

[0043] Data processing, first during the signal acquisition process, the signals received by each contact probe are corrected to the same plane, forming an equivalent "virtual circular array" distributed at the same depth. The vertical coordinates of each detection point on the circular array are calculated according to the horizontal coordinate position corresponding to the detection point of the circular array, and each detection point is connected to form a closed area corresponding to each detection point, and a three-dimensional columnar structure is established. Secondly, the induced electromotive force signal collected by the contact probe 3 corresponding to each depth is mapped to the range of 0-1, and the mapping value corresponding to each depth after interpolation is calculated. Finally, according to the columnar structure of the wellhead oil pipe, each depth layer is equivalent to a "cone" composed of several pixel points. Each pixel point is connected to the coordinate origin, and the circular ring can be divided into multiple sectors. Combined with the contact probe 3 corresponding to the area, the sector radius is calculated to complete the three-dimensional point cloud coordinate conversion.

[0044] Example 3

[0045] The detection device and detection method process are similar to those used in Example 1, except that:

[0046] The detection method provided by the present invention has a flexible hardware configuration, wherein the contact probe 3 can adopt a fatigue-resistant high-reliability TMR sensor, which has the characteristics of low power consumption and simple and convenient installation. The effective number of contact probes 3 can be flexibly set according to the detection requirements. When the transient electromagnetic eddy current detection control unit 6 detects an abnormality, the number of contact probes 3 in the leakage magnetic detection control unit 1 in the abnormal area can be adjusted accordingly to achieve screening of key areas.

[0047] Example 4

[0048] The detection device and detection method process are similar to those used in Example 1, except that:

[0049] The above-mentioned three-dimensional data processing method is used to process the logging data of the experimental well, and the data after casing damage depth compensation is subjected to three-dimensional inversion, so that the graphics reflect the information more clearly to a certain extent.

[0050] Take the YJNxxxxx fracturing well as an example for testing. Figure 4 It can be seen that there is deformation at the depth of 585m in this section, and the damage is at 90 degrees on the right side of the pipe wall. There is a reduction in diameter within the depth range of 600-605m, and the reduction position is between 90 degrees and 180 degrees. The position of the casing collar can also be observed from the imaging map, for example, at 580m, 590m, 600m and 610m in the figure, by comparing the logging curve with the three-dimensional imaging results of the wall thickness, the wall thickness changes at the corresponding positions of the casing can be observed, thus verifying the reliability of the imaging results.

Claims

1. An automated well repair dual-function oil pipe detection method, using a detection device, characterized in that: Follow the process below to implement: Step 1, collecting data of magnetic flux leakage detection and transient electromagnetic eddy current detection; Step 2: Organize the data and give corresponding feedback results.

2. The automatic well repair dual-function oil pipe detection method according to claim 1 is characterized in that: In step 1, the specific process is: The contact probe (3) and the odometer wheel (2) of the magnetic flux leakage detection control unit (1) are both in reliable contact with the outer wall of the oil pipe, and the oil pipe defects are detected by contacting the contact probe (3), and the length of the oil pipe is measured by recording the rolling length of the odometer wheel (2); at the same time, the transient electromagnetic annular probe of the transient electromagnetic eddy current detection control unit (6) synchronously detects the oil pipe defects and records the number of oil pipes; The detection signal of the magnetic flux leakage detection control unit (1) is connected to the magnetic flux leakage detection control cabinet (5), and the detection signal of the transient electromagnetic eddy current detection control unit (6) is connected to the transient electromagnetic eddy current detection control cabinet (7).

3. The automatic well repair dual-function oil pipe detection method according to claim 1 is characterized in that: In step 2, the specific process is: The signals of the magnetic flux leakage detection control cabinet (5) and the transient electromagnetic eddy current detection control cabinet (7) are then connected to the remote control end for data processing, and accurate results of the oil pipe detection are obtained by mutual comparison; If the detection data exceeds the standard, the magnetic flux leakage detection control cabinet (5) or the transient electromagnetic eddy current detection control cabinet (7) issues an alarm prompt through a local alarm device; If the test data is normal, continue to perform continuous testing.

4. The automatic well repair dual-function oil pipe detection method according to claim 3 is characterized in that: The data processing of the remote control terminal includes three-dimensional space coordinate conversion, array data interpolation and normalization, and three-dimensional point cloud coordinate conversion, which are specifically described as follows: Step a: 3D space coordinate conversion. The well circumference is divided into 32 irregular closed areas, and the annular area along the well circumference is mapped into a three-dimensional coordinate system according to the angles at which all contact probes (3) are arranged; the ordinate of each detection point on the circular array is calculated according to the abscissa position corresponding to the detection point of the circular array, and each detection point is connected to form a closed area corresponding to each detection point, thereby establishing a three-dimensional columnar structure; Step b: interpolation and normalization of array data, First, the original array data obtained by all contact probes (3) are read, the number of interpolation is set, the magnification is calculated according to the original logging data and the length of the interpolated data, the interval to which the interpolation point belongs in the original data is calculated using the magnification, the specific gravity parameter is calculated according to the distance between the interpolation point and the left and right endpoints of the interval, and then the value of the interpolation point is solved using the left and right endpoint values ​​of the interval and related parameters; Then, vertical normalization is performed to map the induced electromotive force signals collected by the contact probe (3) corresponding to each depth into a range of 0-1, and the mapping values ​​corresponding to each depth after interpolation are calculated, so that each group of induced electromotive force information can be more intuitively identified under the same standard. Step c: 3D point cloud coordinate conversion. According to the columnar structure of the wellhead oil pipe, each depth layer is equivalent to a "cone" composed of several pixel points. Each pixel point is connected to the coordinate origin, and the ring is divided into multiple sectors. Combined with the detection data of the contact probe (3) corresponding to the area, the radius value corresponding to each pixel point is solved, and the radius matrix corresponding to the induced electromotive force is obtained to realize the three-dimensional point cloud coordinate conversion of the wellhead oil pipe.

5. The automatic well repair dual-function oil pipe detection method according to claim 1, characterized in that: The structure of the detection device is that it comprises a magnetic flux leakage detection control unit (1) and a transient electromagnetic eddy current detection control unit (6). The structure of the magnetic flux leakage detection control unit (1) is as follows: it comprises a magnetic flux leakage detection control cabinet (5), wherein the magnetic flux leakage detection control cabinet (5) is respectively connected to the mileage wheel (2), the contact probe (3), and the transmitting coil bin (4) by signals, wherein the mileage wheel (2), the contact probe (3), and the transmitting coil bin (4) surround the oil pipe (10) in sequence from top to bottom, that is, the contact probe (3) and the mileage wheel (2) are both in contact with the oil pipe of the detection object; the magnetic flux leakage detection control unit (1) is located as a whole between two sections of wellhead devices (12) below the working platform (11) of the automated well repair machine, the upper end face of the mileage wheel (2) is connected to the lower end face of the wellhead device (12) of the upper section by means of a flange, and the lower end face of the transmitting coil bin (4) is connected to the upper end face of the wellhead device (12) of the lower section by means of a flange; The structure of the transient electromagnetic eddy current detection control unit (6) is that it comprises a transient electromagnetic eddy current detection control cabinet (7), the transient electromagnetic eddy current detection control cabinet (7) is respectively connected to the transient electromagnetic annular probe and the transmitting-receiving coil compartment (8) by signal, the transmitting-receiving coil compartment (8) and the transient electromagnetic annular probe are both covered on the outer wall of the casing head or the connecting short section, and are fixed to the outer wall of the casing head (13) or the connecting short section by means of a clamp; The detection signal of the magnetic flux leakage detection control unit (1) is connected to the magnetic flux leakage detection control cabinet (5), and the detection signal of the transient electromagnetic eddy current detection control unit (6) is connected to the transient electromagnetic eddy current detection control cabinet (7). The signals of the magnetic flux leakage detection control cabinet (5) and the transient electromagnetic eddy current detection control cabinet (7) are then connected to the remote control end.

6. The automatic well repair dual-function oil pipe detection method according to claim 5, characterized in that: The magnetic flux leakage detection control cabinet (5) and the transient electromagnetic eddy current detection control cabinet (7) are both provided with local alarm devices.

7. The automatic well repair dual-function oil pipe detection method according to claim 5, characterized in that: The magnetic flux leakage detection control cabinet (5) and the transient electromagnetic eddy current detection control cabinet (7) are integrated on the automated well repair rig operating table and are linked to the automated well repair system to perform data processing at the remote control end.

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