CN106896152B - Crack defect region determination method and apparatus - Google Patents
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Abstract
The invention discloses a crack defect region determination method and device, and belongs to the technical field of petroleum. The method comprises the following steps: acquiring impedance data of a detection coil corresponding to a to-be-detected area of the pipeline in an eddy current detection mode; judging whether the impedance data has preset defect characteristics or not; and when the impedance data has the preset defect characteristics, determining the region to be detected as a crack defect region. The method solves the problem that the determined crack defect area is inaccurate, improves the accuracy of the determined crack defect area, and is used for determining the crack defect area.
Description
Technical Field
The invention relates to the technical field of petroleum, in particular to a crack defect area determination method and a crack defect area determination device.
Background
In the field of petroleum technology, pipelines are generally used for transporting substances such as petroleum or natural gas, but crack defects are easily generated on the circumferential inner surface of the pipeline in the using process of the pipeline, so the circumferential inner surface of the pipeline needs to be detected to determine the position of a crack defect area on the pipeline, and then the crack defects of the crack defect area are repaired.
In the related art, the circumferential inner surface of the pipe is usually detected by eddy current detection. For example, when a pipeline is detected, a detection coil carrying alternating current can be close to the pipeline, at this time, an alternating magnetic field generated by the detection coil induces eddy currents in the pipeline, and the strength of an original magnetic field is changed by the magnetic field generated by the eddy currents, so that the impedance of the detection coil is changed, and therefore whether a crack defect area exists on the annular inner surface of the pipeline or not can be determined according to the change of the impedance of the detection coil.
Because the circumferential inner surface of the pipeline can also have a pit region and an eroded region except the crack defect region, when the circumferential inner surface of the pipeline is detected, the pit region and the eroded region can also influence the change of the impedance of the detection coil, and therefore, the crack defect region determined according to the change of the impedance of the detection coil is relatively inaccurate.
Disclosure of Invention
The invention provides a crack defect region determination method and device, aiming at solving the problem that the determined crack defect region is inaccurate. The technical scheme is as follows:
in one aspect, a crack defect region determination method is provided, the method comprising:
acquiring impedance data of a detection coil corresponding to a to-be-detected area of the pipeline in an eddy current detection mode;
judging whether the impedance data has preset defect characteristics or not;
and when the impedance data has the preset defect characteristics, determining the region to be detected as a crack defect region.
Optionally, the determining whether the impedance data has a preset defect characteristic includes:
determining a parameter curve graph corresponding to the impedance data, wherein the parameter curve graph is used for reflecting the change condition of target parameters along with the position of a detection point in the area to be detected;
judging whether the parameter curve graph has the preset defect characteristics;
and when the parameter curve graph has the preset defect characteristics, determining that the impedance data has the preset defect characteristics.
Optionally, the target parameters include resistance and inductance, the parameter graph includes a resistance graph and an inductance graph,
the resistance curve graph is used for reflecting the change condition of the resistance of the detection coil along with the position of the detection point in the area to be detected, and the inductance curve graph is used for reflecting the change condition of the inductance of the detection coil along with the position of the detection point in the area to be detected.
Optionally, the crack defect region includes: a pipe body crack defect region, a weld joint crack defect region and a weld toe crack defect region,
the determining that the region to be detected is a crack defect region includes:
when the resistance curve graph comprises a crack wave crest and the inductance curve graph comprises a crack wave trough, determining the to-be-detected region as a tube body crack defect region;
when the resistance curve graph comprises welding line troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line troughs, crack wave crests, crack wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, determining that the area to be detected is a welding line crack defect area;
the resistance curve diagram comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and when the inductance curve diagram comprises the welding line wave troughs, the crack wave crests, the welding toe wave troughs, the crack wave crests and the crack wave troughs which are sequentially arranged, the to-be-detected area is determined to be a welding toe crack defect area.
Optionally, the region to be detected is located on the circumferential inner surface of the pipeline.
In another aspect, there is provided a crack defect region determination apparatus including:
the acquisition module is used for acquiring impedance data of the detection coil corresponding to the to-be-detected region of the pipeline in an eddy current detection mode;
the judging module is used for judging whether the impedance data has preset defect characteristics;
and the determining module is used for determining the region to be detected as a crack defect region when the impedance data has the preset defect characteristics.
Optionally, the determining module is further configured to:
determining a parameter curve graph corresponding to the impedance data, wherein the parameter curve graph is used for reflecting the change condition of target parameters along with the position of a detection point in the area to be detected;
judging whether the parameter curve graph has the preset defect characteristics;
and when the parameter curve graph has the preset defect characteristics, determining that the impedance data has the preset defect characteristics.
Optionally, the target parameters include resistance and inductance, the parameter graph includes a resistance graph and an inductance graph,
the resistance curve graph is used for reflecting the change condition of the resistance of the detection coil along with the position of the detection point in the area to be detected, and the inductance curve graph is used for reflecting the change condition of the inductance of the detection coil along with the position of the detection point in the area to be detected.
Optionally, the crack defect region includes: a pipe body crack defect region, a weld joint crack defect region and a weld toe crack defect region,
the determination module is further to:
when the resistance curve graph comprises a crack wave crest and the inductance curve graph comprises a crack wave trough, determining the to-be-detected region as a tube body crack defect region;
when the resistance curve graph comprises welding line troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line troughs, crack wave crests, crack wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, determining that the area to be detected is a welding line crack defect area;
the resistance curve diagram comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and when the inductance curve diagram comprises the welding line wave troughs, the crack wave crests, the welding toe wave troughs, the crack wave crests and the crack wave troughs which are sequentially arranged, the to-be-detected area is determined to be a welding toe crack defect area.
Optionally, the region to be detected is located on the circumferential inner surface of the pipeline.
In summary, the present invention provides a method and an apparatus for determining a crack defect region, after impedance data of a detection coil corresponding to a to-be-detected region of a pipeline is obtained by using an eddy current inspection, it is required to determine whether the obtained impedance data has a preset defect characteristic, that is, the characteristics of the impedance data are compared with the preset defect characteristic one by one, and when the characteristics of the impedance data include the preset defect characteristic, the to-be-detected region corresponding to the impedance data is determined to be the crack defect region, so that a region without the preset defect characteristic (that is, a pit region or a corroded region) is not determined to be the crack defect region by mistake, and therefore, the crack defect region on the pipeline can be accurately identified and determined, and the accuracy of the determined crack defect region is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a method for determining a crack defect region according to an embodiment of the present invention;
FIG. 2-1 is a graph of resistance curves corresponding to crack defect regions in a tube according to an embodiment of the present invention;
fig. 2-2 is a graph of inductance curves corresponding to crack defect regions of a tube according to an embodiment of the present invention;
FIG. 3-1 is a resistance curve corresponding to a weld crack defect region provided in an embodiment of the present invention;
fig. 3-2 is a graph of inductance curves corresponding to a weld crack defect region according to an embodiment of the present invention;
FIG. 4-1 is a graph of resistance curves corresponding to a weld toe crack defect region according to an embodiment of the present invention;
FIG. 4-2 is a graph of inductance curves corresponding to a weld toe crack defect region according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a crack defect region determination apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a crack defect region determination method, which may include:
and 103, when the impedance data has preset defect characteristics, determining the region to be detected as a crack defect region.
In summary, in the method for determining a crack defect region provided in the embodiment of the present invention, after obtaining impedance data of a detection coil corresponding to a to-be-detected region of a pipeline by using an eddy current inspection, it needs to be determined whether the obtained impedance data has a preset defect characteristic, that is, the characteristics of the impedance data need to be compared with the preset defect characteristic one by one, and when the characteristics of the impedance data include the preset defect characteristic, the to-be-detected region corresponding to the impedance data is determined to be the crack defect region, so that a region without the preset defect characteristic (that is, a pit region or a corroded region) is not determined to be the crack defect region by mistake, and therefore, the crack defect region on the pipeline can be accurately identified and determined, and the accuracy of the determined crack defect region is improved.
Illustratively, the tubing may be 813 millimeters in diameter with a 14 millimeter wall thickness. In step 101, a region to be detected may be determined on the pipeline, and impedance data of a detection coil corresponding to the region to be detected may be obtained by using an eddy current detection method.
Further, after the impedance data is acquired, the acquired impedance data may be subjected to filtering, noise reduction, reading, and the like. Optionally, the area to be inspected may be determined in step 101 at the circumferential inner surface of the pipe. The annular inner surface of the pipeline is relatively hidden, and workers cannot observe the form of the annular inner surface by naked eyes.
When step 102 is executed, impedance data may be extracted from the impedance data acquired in step 101, and a parameter graph corresponding to the region to be detected is determined according to the extracted impedance data, where the parameter graph is used to reflect a change condition of the target parameter along with a position of the detection point in the region to be detected.
For example, the target parameter of the detection coil may include a resistance of the detection coil and an inductance of the detection coil, and the parameter curve graph corresponding to the region to be detected may include a resistance curve graph corresponding to the region to be detected and an inductance curve graph corresponding to the region to be detected. For example, the resistance curve graph corresponding to the to-be-detected region may be used to reflect a change condition of the resistance of the detection coil with the position of the detection point in the to-be-detected region, and the inductance curve graph corresponding to the to-be-detected region may be used to reflect a change condition of the inductance of the detection coil with the position of the detection point in the to-be-detected region.
When judging whether the impedance data accord with the preset defect characteristics, judging whether the parameter curve graph of the area to be detected has the preset defect characteristics, and when the parameter curve graph has the preset defect characteristics, determining that the impedance data corresponding to the area to be detected accord with the preset defect characteristics.
Specifically, the crack defect region on the pipe may include: a pipe body crack defect region, a weld crack defect region, and a weld toe crack defect region.
In a first aspect, when the resistance curve graph includes a crack peak and the inductance curve graph includes a crack valley, the region to be detected may be determined as the crack defect region of the tube body in step 103. Fig. 2-1 is a resistance curve diagram corresponding to a crack defect region of a tube according to an embodiment of the present invention, and fig. 2-2 is an inductance curve diagram corresponding to a crack defect region of a tube according to an embodiment of the present invention, where as shown in fig. 2-1, the resistance curve diagram having a predetermined defect characteristic includes a crack peak, and as shown in fig. 2-2, the inductance curve diagram having a predetermined defect characteristic includes a crack valley.
In a second aspect, when the resistance curve graph includes the weld trough, the crack crest and the crack trough which are arranged in sequence, and the inductance curve graph includes the weld trough, the crack crest, the crack trough, the crack crest and the crack trough which are arranged in sequence, the region to be detected can be determined to be the weld crack defect region in step 103. Fig. 3-1 is a resistance curve diagram corresponding to a weld crack defect region according to an embodiment of the present invention, and fig. 3-2 is an inductance curve diagram corresponding to a weld crack defect region according to an embodiment of the present invention, where as shown in fig. 3-1, the resistance curve diagram having the predetermined defect characteristics includes a weld valley, a crack peak and a crack valley arranged in sequence, and as shown in fig. 3-2, the inductance curve diagram having the predetermined defect characteristics includes a weld valley, a crack peak, a crack valley, a crack peak and a crack valley arranged in sequence.
In the third aspect, when the resistance curve graph comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, the to-be-detected area can be determined to be a welding toe crack defect area in the step 103. Fig. 4-1 is a resistance curve diagram corresponding to a weld toe crack defect region provided by an embodiment of the present invention, and fig. 4-2 is an inductance curve diagram corresponding to a weld toe crack defect region provided by an embodiment of the present invention, where as shown in fig. 4-1, the resistance curve diagram having the preset defect characteristics includes a weld valley, a crack peak, a weld toe valley, a crack peak and a crack valley, which are sequentially arranged, and as shown in fig. 4-2, the inductance curve diagram having the preset defect characteristics includes a weld valley, a crack peak, a weld toe valley, a crack peak and a crack valley, which are sequentially arranged.
That is, in step 102, impedance data of the region to be detected may be extracted, and a resistance curve graph and an inductance curve graph corresponding to the region to be detected may be determined according to the impedance data. And then, whether the resistance curve graph and the inductance curve graph corresponding to the region to be detected have preset defect characteristics or not can be sequentially judged. When both the resistance curve graph and the inductance curve graph corresponding to the region to be detected have the preset defect characteristics, step 103 may directly determine that the region to be detected is a crack defect region. Further, in step 103, it may be determined which of the crack defect regions is the crack defect region according to characteristics of the resistance graph and the inductance graph.
For example, if the resistance curve diagram corresponding to the region to be detected includes a crack peak and the inductance curve diagram corresponding to the region to be detected includes a crack valley, the region to be detected may be considered as the tube crack defect region.
Further, if it is determined in step 102 that the impedance data of the detection coil of the to-be-detected region pair does not have the preset defect characteristic, it may be directly determined that the to-be-detected region is not the crack defect region.
Before step 102, it may also be determined whether the region to be detected is a crack-like defect region according to the impedance data, for example, it may be determined whether the region to be detected is a crack-like defect region (referred to as a crack-like defect region in the embodiment of the present invention, that is, a suspected crack defect region in the region to be detected) by using a method in the related art (if the region to be detected is a crack-like defect region, step 102 and step 103 are continuously performed, and if the region to be detected is not a crack-like defect region, it is directly determined that the region to be detected is not a crack defect region, and step 102 and step 103 are not necessarily performed.
In summary, in the method for determining a crack defect region provided in the embodiment of the present invention, after obtaining impedance data of a detection coil corresponding to a to-be-detected region of a pipeline by using an eddy current inspection, it needs to be determined whether the obtained impedance data has a preset defect characteristic, that is, the characteristics of the impedance data need to be compared with the preset defect characteristic one by one, and when the characteristics of the impedance data include the preset defect characteristic, the to-be-detected region corresponding to the impedance data is determined to be the crack defect region, so that a region without the preset defect characteristic (that is, a pit region or a corroded region) is not determined to be the crack defect region by mistake, and therefore, the crack defect region on the pipeline can be accurately identified and determined, and the accuracy of the determined crack defect region is improved.
As shown in fig. 5, an embodiment of the present invention provides a crack defect region determination apparatus 50, and the crack defect region determination apparatus 50 may include:
an obtaining module 501, configured to obtain impedance data of a detection coil corresponding to a to-be-detected region of a pipeline in an eddy current detection manner;
a judging module 502, configured to judge whether the impedance data has a preset defect characteristic;
the determining module 503 is configured to determine that the region to be detected is a crack defect region when the impedance data has the preset defect characteristics.
In summary, in the crack defect region determining apparatus provided in the embodiment of the present invention, after the obtaining module obtains the impedance data of the detection coil corresponding to the to-be-detected region of the pipeline by using the eddy current inspection, the determining module needs to determine whether the obtained impedance data has the preset defect characteristics, that is, needs to compare the characteristics of the impedance data with the preset defect characteristics one by one, and when the characteristics of the impedance data include the preset defect characteristics, the determining module determines that the to-be-detected region corresponding to the impedance data is the crack defect region, so that a region without the preset defect characteristics (that is, a pit region or a corroded region) is not determined as the crack defect region by mistake, and therefore, the crack defect region on the pipeline can be accurately identified and determined, and the accuracy of the determined crack defect region is improved.
Optionally, the determining module 502 is further configured to:
determining a parameter curve graph corresponding to the impedance data, wherein the parameter curve graph is used for reflecting the change condition of target parameters along with the position of a detection point in a region to be detected;
judging whether the parameter curve graph has preset defect characteristics or not;
and when the parameter curve graph has the preset defect characteristics, determining that the impedance data has the preset defect characteristics.
Optionally, the target parameter includes resistance and inductance, the parameter curve graph includes a resistance curve graph and an inductance curve graph, the resistance curve graph is used for reflecting the change condition of the resistance of the detection coil along with the position of the detection point in the region to be detected, and the inductance curve graph is used for reflecting the change condition of the inductance of the detection coil along with the position of the detection point in the region to be detected.
Optionally, the crack defect region includes: the determination module 503 is further configured to:
when the resistance curve diagram comprises a crack wave crest and the inductance curve diagram comprises a crack wave trough, determining that the region to be detected is a tube body crack defect region;
when the resistance curve graph comprises welding line wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line wave troughs, crack wave crests, crack wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, determining the area to be detected as a welding line crack defect area;
and when the inductance curve chart comprises the welding line wave trough, the crack wave crest, the welding toe wave trough, the crack wave crest and the crack wave trough which are sequentially arranged, determining that the area to be detected is the welding toe crack defect area.
Optionally, the region to be detected is located on the circumferential inner surface of the pipe.
In summary, in the crack defect region determining apparatus provided in the embodiment of the present invention, after the obtaining module obtains the impedance data of the detection coil corresponding to the to-be-detected region of the pipeline by using the eddy current inspection, the determining module needs to determine whether the obtained impedance data has the preset defect characteristics, that is, needs to compare the characteristics of the impedance data with the preset defect characteristics one by one, and when the characteristics of the impedance data include the preset defect characteristics, the determining module determines that the to-be-detected region corresponding to the impedance data is the crack defect region, so that a region without the preset defect characteristics (that is, a pit region or a corroded region) is not determined as the crack defect region by mistake, and therefore, the crack defect region on the pipeline can be accurately identified and determined, and the accuracy of the determined crack defect region is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method of crack defect region determination, the method comprising:
acquiring impedance data of a detection coil corresponding to a to-be-detected region of the pipeline in an eddy current detection mode, wherein the to-be-detected region is located on the annular inner surface of the pipeline;
determining a parameter curve graph corresponding to the impedance data, wherein the parameter curve graph is used for reflecting the change condition of a target parameter along with the position of the detection point in the area to be detected, the target parameter comprises resistance and inductance, the parameter curve graph comprises a resistance curve graph and an inductance curve graph, the resistance curve graph is used for reflecting the change condition of the resistance of the detection coil along with the position of the detection point in the area to be detected, and the inductance curve graph is used for reflecting the change condition of the inductance of the detection coil along with the position of the detection point in the area to be detected;
judging whether the parameter curve graph has preset defect characteristics or not; when the parameter curve graph has the preset defect characteristics, determining that the impedance data has the preset defect characteristics;
and when the impedance data has the preset defect characteristics, determining the to-be-detected region as a crack defect region, wherein the crack defect region comprises a pipe body crack defect region, a welding seam crack defect region and a welding toe crack defect region.
2. The method of claim 1, wherein the determining that the region to be detected is a crack defect region comprises:
when the resistance curve graph comprises a crack wave crest and the inductance curve graph comprises a crack wave trough, determining the to-be-detected region as the pipe body crack defect region;
when the resistance curve graph comprises welding line troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line troughs, crack wave crests, crack wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, determining the area to be detected as the welding line crack defect area;
the resistance curve diagram comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and when the inductance curve diagram comprises the welding line wave troughs, the crack wave crests, the welding toe wave troughs, the crack wave crests and the crack wave troughs which are sequentially arranged, the area to be detected is determined to be the welding toe crack defect area.
3. A crack defect region determination apparatus, characterized by comprising:
the detection device comprises an acquisition module, a detection module and a detection module, wherein the acquisition module is used for acquiring impedance data of a detection coil corresponding to a to-be-detected region of the pipeline in an eddy current detection mode, and the to-be-detected region is located on the annular inner surface of the pipeline;
the judging module is used for judging whether the impedance data has preset defect characteristics;
the determining module is used for determining the to-be-detected region as a crack defect region when the impedance data has the preset defect characteristics, wherein the crack defect region comprises a pipe body crack defect region, a welding seam crack defect region and a welding toe crack defect region;
wherein the judging module is further configured to:
determining a parameter curve graph corresponding to the impedance data, wherein the parameter curve graph is used for reflecting the change condition of a target parameter along with the position of the detection point in the area to be detected, the target parameter comprises resistance and inductance, the parameter curve graph comprises a resistance curve graph and an inductance curve graph, the resistance curve graph is used for reflecting the change condition of the resistance of the detection coil along with the position of the detection point in the area to be detected, and the inductance curve graph is used for reflecting the change condition of the inductance of the detection coil along with the position of the detection point in the area to be detected; judging whether the parameter curve graph has the preset defect characteristics; and when the parameter curve graph has the preset defect characteristics, determining that the impedance data has the preset defect characteristics.
4. The crack defect region determination apparatus of claim 3, wherein the determination module is further configured to:
when the resistance curve graph comprises a crack wave crest and the inductance curve graph comprises a crack wave trough, determining the to-be-detected region as the pipe body crack defect region;
when the resistance curve graph comprises welding line troughs, crack wave crests and crack wave troughs which are sequentially arranged, and the inductance curve graph comprises welding line troughs, crack wave crests, crack wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, determining the area to be detected as the welding line crack defect area;
the resistance curve diagram comprises welding line wave troughs, crack wave crests, welding toe wave troughs, crack wave crests and crack wave troughs which are sequentially arranged, and when the inductance curve diagram comprises the welding line wave troughs, the crack wave crests, the welding toe wave troughs, the crack wave crests and the crack wave troughs which are sequentially arranged, the area to be detected is determined to be the welding toe crack defect area.
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