CN108716397B - Method and device for calculating logging azimuth resolution by gamma imaging while drilling - Google Patents
Method and device for calculating logging azimuth resolution by gamma imaging while drilling Download PDFInfo
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- CN108716397B CN108716397B CN201810292102.3A CN201810292102A CN108716397B CN 108716397 B CN108716397 B CN 108716397B CN 201810292102 A CN201810292102 A CN 201810292102A CN 108716397 B CN108716397 B CN 108716397B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 119
- 238000005553 drilling Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000002285 radioactive effect Effects 0.000 claims description 37
- 230000015572 biosynthetic process Effects 0.000 claims description 29
- 238000012545 processing Methods 0.000 claims description 17
- 238000009825 accumulation Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 abstract description 9
- 239000013078 crystal Substances 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 5
- 230000005251 gamma ray Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a method and a device for calculating the orientation resolution of a gamma imaging logging while drilling, which are characterized in that a measurement while drilling environment model is established, the gamma counting rates of a gamma imaging logging instrument under different orientation angles are obtained, the gamma counting rates of the gamma imaging logging instrument under different orientation angles are normalized, the normalized gamma counting rates under different orientation angles are obtained, the normalized gamma counting rates under different orientation angles are respectively used as orientation differential geometric factors corresponding to the different orientation angles, the detection characteristics of the gamma imaging logging while drilling instrument can be analyzed by utilizing the orientation differential geometric factors, the orientation differential geometric factors corresponding to the different orientation angles are converted into orientation integral geometric factors, the orientation resolution of the gamma imaging logging while drilling instrument is obtained according to the orientation integral geometric factors, and the circumferential detection characteristics of the gamma imaging logging while drilling instrument can be accurately judged, so that the geosteering is better performed.
Description
Technical Field
The invention relates to the field of development and optimization design of logging instruments in oil and gas exploration, in particular to a method and a device for calculating the azimuth resolution of logging by gamma-ray imaging while drilling.
Background
In recent years, with the improvement of the development degree of oil and gas exploration and the production requirement, the difficulty of searching a large-scale integral oil and gas field capable of being exploited for a long time is increased, the aim of oil and gas exploration is gradually shifted to unconventional oil and gas reservoirs with complex geological structures and poor formation physical properties, the re-exploitation of complex oil and gas reservoirs which are considered to have no industrial exploitation value in the prior art is also gradually paid high attention by various national oil companies, and a geosteering drilling technology serving as a technical support of the complex oil and gas reservoirs provides powerful technical support for the exploitation of the oil and gas reservoirs.
The gamma imaging logging while drilling is used as one of the methods for guiding the geosteering, has the azimuth detection characteristic compared with the conventional gamma logging, and can visually display the stratum around the borehole according to the radioactive intensity by imaging by using azimuth measurement data. The azimuth detection characteristic of the gamma imaging logging-while-drilling instrument is researched, and the accurate calculation of the azimuth resolution of the instrument becomes very important.
Therefore, how to accurately calculate the azimuth resolution of the while-drilling gamma imaging logging instrument is a technical problem to be solved urgently in the field.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method and a device for calculating the azimuth resolution of the gamma-ray imaging logging while drilling, which are used for accurately calculating the azimuth resolution of the gamma-ray imaging logging while drilling instrument.
In a first aspect, an embodiment of the present invention provides a method for calculating a logging azimuth resolution of a gamma-ray imaging while drilling, including:
establishing a measurement-while-drilling environment model;
acquiring gamma counting rates of a gamma imaging logging instrument at different azimuth angles according to the measurement-while-drilling environment model;
normalizing the gamma counting rates of the gamma imaging logging instrument under different azimuth angles to obtain normalized gamma counting rates under different azimuth angles, and respectively taking the normalized gamma counting rates under different azimuth angles as azimuth differential geometric factors corresponding to the different azimuth angles;
and converting the azimuth differential geometric factors corresponding to the different azimuth angles into azimuth integral geometric factors, and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the establishing a measurement-while-drilling environment model includes:
establishing a borehole and stratum model of a gamma imaging logging instrument in a drilling environment; the stratum model is a cylinder, the borehole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum elements are embedded in the non-radioactive stratum, and the high-radioactivity stratum elements penetrate through the non-radioactive stratum along the axis direction of the stratum model and penetrate through the non-radioactive stratum from inside to outside.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the acquiring gamma count rates of the gamma imaging logging instrument at different azimuth angles includes:
when a detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal, setting the current azimuth angle to be 0 degree;
and controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole by taking 0 ℃ as a starting point, and measuring a gamma counting rate at preset angle intervals in the rotating process until the gamma imaging logging instrument rotates for a circle, so as to obtain the gamma counting rates of the gamma imaging logging instrument at different azimuth angles.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the converting the orientation differential geometric factors corresponding to different orientation angles into orientation integral geometric factors includes:
and carrying out symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
With reference to any one of the first to the third possible embodiments of the first aspect, the borehole has a diameter of 23 cm, the formation model has an outer diameter of 104 cm, and the formation model has a height of 200 cm.
In a second aspect, an embodiment of the present invention provides a logging while drilling gamma imaging azimuth resolution apparatus, including:
the model establishing module is used for establishing a measurement-while-drilling environment model;
the data acquisition module is used for acquiring gamma counting rates of the gamma imaging logging instrument at different azimuth angles according to the measurement while drilling environment model;
the data processing module is used for normalizing the gamma counting rates of the gamma imaging logging instrument under different azimuth angles to obtain normalized gamma counting rates under different azimuth angles, and respectively taking the normalized gamma counting rates under different azimuth angles as azimuth differential geometric factors corresponding to the different azimuth angles; and the system is used for converting the azimuth differential geometric factors corresponding to different azimuth angles into azimuth integral geometric factors and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the model establishing module is specifically configured to establish a model of a borehole and a formation of a gamma imaging logging instrument in a while-drilling environment; the stratum model is a cylinder, the borehole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum elements are embedded in the non-radioactive stratum, and the high-radioactivity stratum elements penetrate through the non-radioactive stratum along the axis direction of the stratum model and penetrate through the non-radioactive stratum from inside to outside.
With reference to the second aspect, an embodiment of the present invention provides a second possible implementation manner of the second aspect, where the data obtaining module includes:
the setting unit is used for setting the current azimuth angle to be 0 degree when a detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal;
and the measuring unit is used for controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole by taking 0 degree as a starting point, and measuring a gamma counting rate at a preset angle interval in the rotating process until the gamma imaging logging instrument rotates for a circle so as to obtain the gamma counting rates of the gamma imaging logging instrument at different azimuth angles.
With reference to the second aspect, an embodiment of the present invention provides a third possible implementation manner of the second aspect, where the data processing module includes:
and the processing unit is used for performing symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
With reference to any one of the second to third possible embodiments of the second aspect, the borehole has a diameter of 23 cm, the formation model has an outer diameter of 104 cm, and the formation model has a height of 200 cm.
The invention provides a method and a device for calculating the azimuth resolution of a gamma imaging logging while drilling, which are characterized in that a measurement while drilling environment model is established, the gamma counting rates of a gamma imaging logging instrument under different azimuth angles are obtained according to the measurement while drilling environment model, then the gamma counting rates of the gamma imaging logging instrument under different azimuth angles are normalized, so that the normalized gamma counting rates under different azimuth angles are obtained, the normalized gamma counting rates under different azimuth angles are respectively used as azimuth differential geometric factors corresponding to the different azimuth angles, so that the detection characteristics of the gamma imaging logging while drilling instrument can be analyzed by using the azimuth differential geometric factors, then the azimuth differential geometric factors corresponding to the different azimuth angles are converted into azimuth integral geometric factors, and the azimuth resolution of the gamma imaging logging instrument is obtained according to the azimuth integral geometric factors, the method is favorable for accurately judging the circumferential detection characteristic of the gamma imaging logging-while-drilling instrument, so that the geological guidance can be more accurately carried out.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart of a method for calculating a logging-while-drilling gamma imaging azimuth resolution according to an embodiment of the present invention;
FIG. 2 is a diagram of the results of the orientation differential geometry factor calculation for a gamma imaging logging tool according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the results of the orientation integral geometry factor calculation for a gamma imaging logging tool according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a borehole and formation model in a while drilling environment with a gamma imaging logging tool provided in accordance with an embodiment of the invention;
fig. 5 is a schematic structural diagram of a logging-while-drilling gamma imaging azimuth resolution calculation device according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other examples obtained based on the examples in the present invention are within the scope of the present invention.
The embodiment of the invention aims to form a practical method and a practical device for calculating the azimuth resolution of the logging by gamma imaging while drilling, and provide support for the optimal design and azimuth gamma imaging of a gamma imaging logging instrument. The gamma imaging logging instrument in the embodiment of the invention comprises a gamma detector. The detector may be sodium iodide (NaI), Bismuth Germanate (BGO), or other crystal detector, which is only illustrated and not limited herein.
Fig. 1 is a schematic flow chart of a method for calculating a logging azimuth resolution of gamma-ray imaging while drilling according to an embodiment of the present invention, as shown in fig. 1, including the following steps:
s101, establishing a measurement while drilling environment model.
Specifically, the embodiment of the invention provides a method for calculating azimuth resolution of a gamma imaging logging-while-drilling tool, which aims to measure and calculate azimuth resolution of a gamma imaging logging-while-drilling tool with a single gamma detector. Then first, a model of the measurement environment of the gamma imaging tool for a single gamma detector is created. In practical application, the cylinder has no edges and corners, so that the safety is good, and in addition, the cylinder has the other good characteristic that the whole friction coefficient is small, so that the cylinder is not easily weathered and damaged, and the stability is stronger, so that the model can be preferably designed into a cylinder and comprises stratum structures with different radioactivity.
S102, obtaining gamma counting rates of the gamma imaging logging instrument under different azimuth angles according to the measurement while drilling environment model.
Specifically, according to the measurement-while-drilling environment model, the gamma imaging logging instrument is placed in the measurement-while-drilling environment model, and the gamma imaging logging instrument is positioned at different positions of the measurement-while-drilling environment model for measurement, for example, the gamma imaging logging instrument rotates at a constant speed in the measurement-while-drilling environment model, measures the gamma counting rate at intervals of a certain azimuth angle, and records corresponding values. The gamma imaging logging instrument is characterized in that a U-shaped window is formed in the position of a detector crystal, the opening angle is 0 degree, preferably, the diameter of the detector crystal is 1 inch, the length of the detector crystal is 20 centimeters, and the windowing material at the position of the detector crystal is beryllium.
It is worth mentioning that, for the same radioactive stratum, the gamma counting rates detected by the gamma detector under different azimuth angles are often different, and there is a rule that the larger the relative angle between the detection azimuth and the radioactive stratum is, the smaller the gamma counting rate is.
S103, normalizing the gamma counting rates of the gamma imaging logging instrument at different azimuth angles to obtain normalized gamma counting rates at different azimuth angles, and respectively taking the normalized gamma counting rates at different azimuth angles as azimuth differential geometric factors corresponding to the different azimuth angles.
Specifically, after the gamma counting rates of the gamma imaging logging instrument at different azimuth angles are measured, all the measured gamma counting rates are added to obtain a total gamma counting rate, then the percentage of the gamma counting rates at different azimuth angles in the total gamma counting rates is calculated and recorded in a decimal form, and thus the normalized gamma counting rates at different azimuth angles are obtained.
And establishing a function relation between the normalized gamma counting rate and the azimuth angle to obtain azimuth differential geometric factors corresponding to different azimuth angles. As shown in fig. 2, the azimuth differential geometry factors of the gamma imaging logging instrument are distributed in a bell shape, the gamma counting rate at the 0-degree azimuth angle facing the detector crystal window is the largest, the gamma counting rate at the 180-degree (-180-degree) azimuth angle facing away from the detector crystal window is the smallest, the gamma counting rates at the middle azimuth angles (-180-0-degree and 0-180-degree) are symmetrically reduced, and the gamma counting rates at symmetrical orientations (for example, -45-degree and 45-degree) are not completely equal.
And S104, converting the azimuth differential geometric factors corresponding to different azimuth angles into azimuth integral geometric factors, and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
Specifically, the orientation differential geometric factors corresponding to different orientation angles can be accumulated according to a certain sequence through computer programming, and the orientation differential geometric factors corresponding to the corresponding orientation angles are converted into orientation integral geometric factors. As shown in fig. 3, the normalized gamma count rate corresponding to the 360-degree radioactive formation is 1, that is, the radioactive contribution rate corresponding to the omnidirectional radioactive formation is 1. In practical application, the conversion result of the orientation integral geometric factor can be derived through a computer program, so that the orientation integral geometric factors corresponding to different sectors (angles), namely the percentage of the contribution of the gamma counting rate of the stratum sector, which is faced by the gamma detector, to the total counting rate can be intuitively read, as shown in table 1; the azimuth angles that can be resolved by the gamma imaging logging instrument corresponding to different azimuth integral geometric factors can be obtained through interpolation, as shown in table 2.
TABLE 1 azimuthal resolution of gamma imaging logging instruments to resolve different formation sectors
| Number of sectors (°) of stratum | Orientation integral geometric factor |
| 16 sectors (22.5 degree) | 0.576 |
| 12 sectors (30 degree) | 0.658 |
| 8 sectors (45 degree) | 0.784 |
| 4 sectors (90 degree) | 0.925 |
TABLE 2 azimuthal resolution of gamma imaging logging instrument when different values are taken for azimuthal integral
And then obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factor. It is worth mentioning that the obtained azimuth resolution of the gamma imaging logging instrument is divided into two cases: the first case is that the gamma imaging logging tool resolves the values of the orientation integral geometric factors corresponding to the stratum of a certain sector or orientation angle, for example, as can be seen from table 1, the values of the orientation integral geometric factors corresponding to the stratum of a certain sector (for example, 16 sectors (22.5 °), 12 sectors (30 °)) resolved by the gamma imaging logging tool are respectively: 0.576, 0.658; the second case is that when the azimuth integral geometric factor is 0.8, the azimuth angle of the stratum resolved by the gamma imaging logging instrument, for example, as can be seen from table 2, when the azimuth integral geometric factor is 0.8, the corresponding value of 47.8 ° is the azimuth angle of the stratum resolved by the gamma imaging logging instrument.
To sum up, in the method for calculating the azimuth resolution of the gamma imaging logging while drilling provided by this embodiment, the measurement while drilling environment model is established, the gamma counting rates of the gamma imaging logging instrument at different azimuth angles are obtained according to the measurement while drilling environment model, then the gamma counting rates of the gamma imaging logging instrument at different azimuth angles are normalized, so as to obtain the normalized gamma counting rates at different azimuth angles, and the normalized gamma counting rates at different azimuth angles are respectively used as the azimuth differential geometric factors corresponding to the different azimuth angles, so as to analyze the detection characteristics of the gamma imaging logging while drilling instrument by using the azimuth differential geometric factors, then the azimuth differential geometric factors corresponding to the different azimuth angles are converted into the azimuth integral geometric factors, and the azimuth resolution of the gamma imaging logging instrument is obtained according to the azimuth integral geometric factors, therefore, the method is favorable for accurately judging the circumferential detection characteristic of the gamma imaging logging-while-drilling instrument, and better performing geological guiding.
In another embodiment, the step S101 specifically includes:
s1011, establishing a borehole and stratum model of the gamma imaging logging instrument in a drilling environment;
the stratum model is a cylinder, the borehole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum elements are embedded in the non-radioactive stratum, and the high-radioactivity stratum elements penetrate through the non-radioactive stratum along the axis direction of the stratum model and penetrate through the non-radioactive stratum from inside to outside.
As an example, as shown in FIG. 4, a model of a borehole and a formation of a gamma imaging logging tool in a while-drilling environment is created, wherein the formation model is a cylinder, preferably, the cylinder has a diameter of 104 cm and a height of 200 cm. WellThe hole is arranged at the center of the cylindrical stratum model and penetrates through the stratum model along the axial direction of the stratum model, preferably, fresh water mud is filled in the borehole, and the density of the mud is 1.0g/cm3. Further, as shown in fig. 4, the formation model includes a non-radioactive formation, in which highly radioactive formation microelements are embedded, and it is worth to mention that the highly radioactive formation microelements penetrate the non-radioactive formation along the axis direction of the formation model and penetrate the non-radioactive formation from inside to outside, and preferably, the highly radioactive formation microelements are made of mudstone, and the mudstone contains highly radioactive elements and contents of 5 parts per million (abbreviated as 5ppm) uranium (U), 10ppm thorium (Th) and 5% potassium (K), respectively, and has a density of 2.5 grams per cubic centimeter (g/cm)3) The cross section of the high-radioactivity stratum infinitesimal is fan-shaped, and the opening angle of the fan-shaped is
In one embodiment, the borehole may have a diameter of 23 cm, the formation model may have an outer diameter of 104 cm, and the formation model may have a height of 200 cm.
In the embodiment, the implementation of the method for calculating the azimuth resolution of the gamma imaging logging while drilling is more scientific and reasonable by reasonably establishing the borehole and stratum models of the gamma imaging logging instrument in the environment while drilling.
In another embodiment, the step S102 may include the following steps:
and S1021, when the detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal element, setting the current azimuth angle to be 0 degree.
Specifically, when the U-shaped window at the detector crystal of the gamma imaging logging instrument is opened towards a high-radioactivity stratum infinitesimal, the current azimuth angle is set to be 0 degree.
S1022, with 0 degree as a starting point, controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole, and measuring a gamma counting rate at preset angle intervals in the rotating process until the gamma imaging logging instrument rotates for a circle, so as to obtain the gamma counting rates of the gamma imaging logging instrument under different azimuth angles.
Specifically, the gamma imaging logging instrument is controlled to rotate in a preset direction in the borehole with 0 degree as a starting point, the direction can be a counterclockwise direction or a clockwise direction, the direction is not limited in this case, and a gamma counting rate is measured at preset angle intervals during the rotation, preferably, the angle can be set to 7.5 degrees, and then the gamma counting rates of the gamma imaging logging instrument at different azimuth angles are obtained until the gamma imaging logging instrument rotates once. For example, a gamma counting rate is measured and recorded at an azimuth angle of 0 degree, the gamma imaging logging tool rotates counterclockwise by 7.5 degrees to 7.5 degrees and then records a gamma counting rate again, then rotates counterclockwise by 7.5 degrees, that is, records a gamma counting rate again at an azimuth angle of 15 degrees, and so on, after rotating to 180 degrees and recording the gamma counting rate, it is worth mentioning that the azimuth angle of 180 degrees at this time coincides with the azimuth angle of-180 degrees, and then rotates counterclockwise by 7.5 degrees to reach an azimuth angle of-172.5 degrees, and continues to rotate the gamma imaging logging tool until the azimuth angle of 0 degree is returned again.
In another embodiment, the converting the azimuth differential geometric factors corresponding to the different azimuth angles into azimuth integral geometric factors in S104 includes:
s1041, carrying out symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
Specifically, the azimuth differential geometric factors corresponding to different azimuth angles in step S103 are subjected to symmetric accumulation processing to obtain azimuth integral geometric factors corresponding to different azimuth angles except for 0 degree. Still by way of example, when the preset angle is 7.5 degrees, the first azimuth angle in the azimuth integration geometric factor is 7.5 degrees, the next azimuth angle is 15 degrees, the next azimuth angle is 22.5 degrees, and so on, each azimuth angle in the azimuth integration geometric factor is obtained.
Secondly, for the azimuth angle of 7.5 degrees of the first azimuth angle in the azimuth integral geometric factors, the value of the corresponding azimuth integral geometric factor is the value corresponding to the azimuth angle of 0 degree in the azimuth differential geometric factors, then the value of the azimuth integral geometric factor corresponding to the second azimuth angle of 15 degrees is the sum of the values corresponding to the azimuth angles of 0 degree and 7.5 degrees in the azimuth differential geometric factors, then the value corresponding to the third azimuth angle of 22.5 degrees in the azimuth integral geometric factors is the sum of the values corresponding to the azimuth angles of 0 degree, 7.5 degrees and-7.5 degrees in the azimuth differential geometric factors, the calculation is continued, the value corresponding to the fourth azimuth angle of 30 degrees in the azimuth integral geometric factors is the sum of the values corresponding to the azimuth angles of 0 degree, 7.5 degrees, -7.5 degrees and 15 degrees in the azimuth differential geometric factors, and the value corresponding to the fifth azimuth angle of 37.5 degrees in the azimuth integral geometric factors is the value corresponding to the azimuth angle of 0 degree, 7.5 degrees, And carrying out symmetrical accumulation processing on the orientation differential geometric factors to obtain orientation integral geometric factors corresponding to other orientation angles by the sum of values corresponding to the 7.5 degrees, -7.5 degrees, 15 degrees and-15 degrees of orientation angles and so on. It is worth mentioning that the last 360 degrees azimuth angle corresponds to the summation of all differential geometry factors.
Fig. 5 is a schematic structural diagram of a logging while drilling gamma imaging azimuth resolution device according to a second embodiment of the present invention, as shown in fig. 5, including:
the model establishing module 501 is used for establishing a measurement-while-drilling environment model;
the data acquisition module 502 is used for acquiring gamma counting rates of the gamma imaging logging instrument at different azimuth angles according to the measurement while drilling environment model;
the data processing module 503 is configured to normalize the gamma counting rates of the gamma imaging logging instrument at different azimuth angles to obtain normalized gamma counting rates at different azimuth angles, and respectively use the normalized gamma counting rates at different azimuth angles as azimuth differential geometric factors corresponding to different azimuth angles; and the system is used for converting the azimuth differential geometric factors corresponding to different azimuth angles into azimuth integral geometric factors and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
The device is used for executing the method embodiments, and the implementation principle and the technical effect are similar, and are not described herein again.
In another embodiment, the model establishing module 501 is specifically configured to establish a borehole and formation model of a gamma imaging logging instrument in a while-drilling environment; the stratum model is a cylinder, the well hole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum infinitesimal is embedded in the non-radioactive stratum, and the high-radioactivity stratum infinitesimal penetrates through the non-radioactive stratum along the axis direction of the stratum model and penetrates through the non-radioactive stratum from inside to outside.
In another embodiment, the data acquisition module 502 includes:
the setting unit is used for setting the current azimuth angle to be 0 degree when a detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal;
and the measuring unit is used for controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole by taking 0 degree as a starting point, and measuring a gamma counting rate at a preset angle interval in the rotating process until the gamma imaging logging instrument rotates for a circle so as to obtain the gamma counting rates of the gamma imaging logging instrument under different azimuth angles.
In another embodiment, the data processing module 503 includes:
and the processing unit is used for performing symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
In one embodiment, the borehole may have a diameter of 23 cm, the formation model may have an outer diameter of 104 cm, and the formation model may have a height of 200 cm.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for calculating logging azimuth resolution by gamma imaging while drilling is characterized by comprising the following steps:
establishing a measurement-while-drilling environment model;
acquiring gamma counting rates of a gamma imaging logging instrument at different azimuth angles according to the measurement-while-drilling environment model;
normalizing the gamma counting rates of the gamma imaging logging instrument under different azimuth angles to obtain normalized gamma counting rates under different azimuth angles, and respectively taking the normalized gamma counting rates under different azimuth angles as azimuth differential geometric factors corresponding to the different azimuth angles;
and converting the azimuth differential geometric factors corresponding to the different azimuth angles into azimuth integral geometric factors, and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
2. The method of claim 1, wherein the establishing a measurement-while-drilling environment model comprises:
establishing a borehole and stratum model of a gamma imaging logging instrument in a drilling environment; the stratum model is a cylinder, the borehole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum elements are embedded in the non-radioactive stratum, and the high-radioactivity stratum elements penetrate through the non-radioactive stratum along the axis direction of the stratum model and penetrate through the non-radioactive stratum from inside to outside.
3. The method of claim 2, wherein the obtaining gamma count rates of the gamma imaging logging instrument at different azimuthal angles comprises:
when a detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal, setting the current azimuth angle to be 0 degree;
and controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole by taking 0 ℃ as a starting point, and measuring a gamma counting rate at preset angle intervals in the rotating process until the gamma imaging logging instrument rotates for a circle, so as to obtain the gamma counting rates of the gamma imaging logging instrument at different azimuth angles.
4. The method of claim 1, wherein converting the orientation differential geometry factors corresponding to the different orientation angles into orientation integral geometry factors comprises:
and carrying out symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
5. A method according to claim 2 or 3, wherein the borehole has a diameter of 23 cm, the formation model has an outer diameter of 104 cm and the formation model has a height of 200 cm.
6. A device for logging azimuth resolution by gamma imaging while drilling is characterized by comprising:
the model establishing module is used for establishing a measurement-while-drilling environment model;
the data acquisition module is used for acquiring gamma counting rates of the gamma imaging logging instrument at different azimuth angles according to the measurement while drilling environment model;
the data processing module is used for normalizing the gamma counting rates of the gamma imaging logging instrument under different azimuth angles to obtain normalized gamma counting rates under different azimuth angles, and respectively taking the normalized gamma counting rates under different azimuth angles as azimuth differential geometric factors corresponding to the different azimuth angles; and the system is used for converting the azimuth differential geometric factors corresponding to different azimuth angles into azimuth integral geometric factors and obtaining the azimuth resolution of the gamma imaging logging instrument according to the azimuth integral geometric factors.
7. The apparatus of claim 6,
the model establishing module is specifically used for establishing a borehole and stratum model of the gamma imaging logging instrument in a drilling environment; the stratum model is a cylinder, the borehole is arranged in the center of the stratum model and penetrates through the stratum model along the axis direction of the stratum model, the stratum model comprises a non-radioactive stratum, high-radioactivity stratum elements are embedded in the non-radioactive stratum, and the high-radioactivity stratum elements penetrate through the non-radioactive stratum along the axis direction of the stratum model and penetrate through the non-radioactive stratum from inside to outside.
8. The apparatus of claim 7, wherein the data acquisition module comprises:
the setting unit is used for setting the current azimuth angle to be 0 degree when a detector window of the gamma imaging logging instrument faces to a high-radioactivity stratum infinitesimal;
and the measuring unit is used for controlling the gamma imaging logging instrument to rotate towards a preset direction in the borehole by taking 0 degree as a starting point, and measuring a gamma counting rate at a preset angle interval in the rotating process until the gamma imaging logging instrument rotates for a circle so as to obtain the gamma counting rates of the gamma imaging logging instrument at different azimuth angles.
9. The apparatus of claim 6, wherein the data processing module comprises:
and the processing unit is used for performing symmetrical accumulation processing on the azimuth differential geometric factors corresponding to the different azimuth angles to obtain azimuth integral geometric factors corresponding to the different azimuth angles except for 0 degree.
10. The apparatus of claim 7 or 8, wherein the borehole has a diameter of 23 cm, the formation model has an outer diameter of 104 cm, and the formation model has a height of 200 cm.
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