CN112554866A - Calibration device and calibration method for cement density logging instrument - Google Patents
Calibration device and calibration method for cement density logging instrument Download PDFInfo
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- CN112554866A CN112554866A CN202011445828.XA CN202011445828A CN112554866A CN 112554866 A CN112554866 A CN 112554866A CN 202011445828 A CN202011445828 A CN 202011445828A CN 112554866 A CN112554866 A CN 112554866A
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- sleeve
- cement
- cement density
- logging instrument
- calibrated
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- 239000004568 cement Substances 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000523 sample Substances 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims 2
- 238000004164 analytical calibration Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010606 normalization Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a calibration device and a method for a cement density logging instrument, which adopts a sleeve and a sandstone formation module, the sleeve is embedded in the sandstone formation module, a cement sheath with the same density is arranged between the sleeve and the sandstone formation module to form a layer injection structure, then water is injected into the sleeve, the sleeve is used for placing the cement density logging instrument to be calibrated, the cement density logging instrument to be calibrated is connected with a detection device through a lead, the cement sheath with the same density between the sleeve and the sandstone formation module is used as a uniform detection environment, the detection value on each probe can be rapidly and accurately obtained, the structure is simple, the standard data of each probe can be rapidly and accurately realized, thereby the average count value of six probes is obtained, the structure is simple, the safety and the reliability are realized, 6 count values are kept consistent after the calibration of the calibration device, the complicated calibration detection is not needed, the method can obtain a satisfactory measurement result, is convenient and precise to operate, and normalizes the measurement values of the 6 cement density probes.
Description
Technical Field
The invention relates to the technical field of petroleum logging, in particular to a calibration device and a calibration method for a cement density logging instrument.
Background
The cement density logging instrument is a radioactive logging method, the instrument generates gamma rays by a 250 milliCurie Cs137 gamma radioactive source, 6 cement sheath density gamma ray probes are uniformly arranged at the position of 0.42 m away from the source and in the position of 360 degrees, the instrument is centered in a casing during logging, the gamma ray source emits 0.662Mev gamma rays to surrounding media, the gamma rays and substances in the medium in the casing, the cement sheath and a stratum have the effects of Compton scattering, Rayleigh scattering, photoelectric absorption and the like, and the probes receive the gamma rays with the scattered energy reduced, so that 6 counting rate curves reflecting the cement density can be obtained.
Because the cement density logging instrument has 6 probes for measuring the cement density, when the cement density outside the casing is the same, the 6 counting values should be consistent, because 6 probes and 6 matched detection circuits are different, the actually measured 6 counting values are inconsistent, the measurement result is inconsistent with the actual result, and a large amount of labor and material cost is consumed for screening 6 completely consistent probes and manufacturing 6 completely consistent detection circuits.
Disclosure of Invention
The invention aims to provide a calibration method of a cement density logging instrument, which overcomes the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a cement density logger calibration device, includes sleeve and sandstone stratum module, and the sleeve is buried underground in sandstone stratum module, is equipped with the same density cement sheath between sleeve and the sandstone stratum module, has annotated water in the sleeve, is used for placing in the sleeve and treats the calibration cement density logger, treats the calibration cement density logger and passes through the wire and connect in detection device.
Furthermore, the depth of the sleeve is larger than the length of the cement density logging instrument to be calibrated, and the cement density logging instrument to be calibrated can be completely immersed into the sleeve.
Furthermore, the sandstone stratum module adopts rock blocks or sandstone concrete blocks.
Further, adopt a plurality of rock pieces or grit concrete piece to pile up and form the sandstone substructure, or adopt a monoblock rock piece or grit concrete piece.
Furthermore, the rock block is provided with holes, the sleeve is embedded in the holes of the rock block, and cement rings with the same density are filled between the sleeve and the holes of the rock block.
Further, adopt the grit concrete piece back off to build the grit concrete piece that forms with the hole, the same density cement sheath wraps up the sleeve outside.
Further, a guiding and positioning device is arranged above the sleeve and comprises a guide wheel, a guide belt is arranged on the guide wheel, one end of the guide belt is wound on the guide wheel, and the other end of the guide belt is fixedly connected to the cement density logging instrument to be calibrated.
Furthermore, the lower end of the guide wheel is provided with a guide pipe, the guide belt is wound on the guide wheel, and one end of the guide belt penetrates through the guide pipe and is fixedly connected with one end of the cement density logging instrument to be calibrated.
A calibration method of a cement density logging instrument comprises the following steps:
s1, communicating the cement density logging instrument to be calibrated with the detection device through a lead, and then fixedly connecting one end of the cement density logging instrument to be calibrated with the guide belt;
s2, placing the cement density logging instrument to be calibrated into the sleeve by using a guide wheel structure, and injecting water into the sleeve;
s3, acquiring cement density count values of 6 probes on the cement density logging instrument to be calibrated through a detection device, and calculating the average value of the cement density count values of the 6 probes; and calculating the ratio of the average value to each cement density count value to obtain the calibration coefficient of each probe, thereby completing the calibration of the cement density logging instrument to be calibrated.
Further, the cement density logging instrument to be calibrated is completely immersed into the sleeve, water is injected into the sleeve, the water surface is higher than the upper end surface of the cement density logging instrument to be calibrated, the count value of each probe is obtained by utilizing the calibrated cement density logging instrument, the calibration coefficient of each probe is multiplied by the count value obtained by detection, and the count value of the probe normalization is obtained.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a calibration device of a cement density logger, which adopts a sleeve and a sandstone formation module, wherein the sleeve is embedded in the sandstone formation module, a cement sheath with the same density is arranged between the sleeve and the sandstone formation module to form a layer injection structure, then water is injected into the sleeve, the sleeve is used for placing a cement density logging instrument to be calibrated, the cement density logging instrument to be calibrated is connected with a detection device through a lead, a cement sheath with the same density between the sleeve and the sandstone formation module is used as a unified detection environment, the detection value on each probe can be rapidly and accurately obtained, the structure is simple, the standard data of each probe can be rapidly and accurately realized, therefore, the average count value of the six probes is obtained, the structure is simple, the safety and the reliability are realized, 6 counts are kept consistent after the calibration of the calibration device, and a satisfactory measurement result can be obtained without complicated calibration detection.
Furthermore, the depth of the sleeve is larger than the length of the cement density logging instrument to be calibrated, the cement density logging instrument to be calibrated can be completely immersed into the sleeve, accurate data of 6 probes can be detected, and the device is simple in structure, safe and reliable.
Furthermore, set up the hole on the rock piece, the sleeve is buried underground in the hole of rock piece, fills the same density cement sheath between sleeve and rock piece hole, simple structure, the installation and debugging of being convenient for.
Further, sleeve top is provided with guiding orientation device, and guiding orientation device includes the leading wheel, is equipped with the guidance tape on the leading wheel, and guidance tape one end winding is on the leading wheel, and other end fixed connection is in waiting to mark cement density logging instrument, can accurate quick installation place, improves detection efficiency.
The invention relates to a calibration method of a cement density logging instrument, which comprises the steps of communicating the cement density logging instrument to be calibrated with a detection device through a lead, then fixedly connecting one end of the cement density logging instrument to be calibrated with a guide belt, placing the cement density logging instrument to be calibrated into a sleeve by utilizing a guide wheel structure, and injecting water into the sleeve; acquiring a cement density count value of 6 probes on a cement density logging instrument to be calibrated through a detection device, and calculating an average value of the cement density count values of the 6 probes; the calibration coefficient of each probe can be obtained by calculating the ratio of the average value to each cement density count value, the calibration of the cement density logging instrument to be calibrated is completed, 6 count values are kept consistent after the calibration of the calibration device, a satisfactory measurement result can be obtained without complex calibration detection, and the production and manufacturing cost is saved. In the detection process, the calibration coefficient of each probe is multiplied by the detected count value to obtain the count value of the probe normalization, the operation is convenient and precise, and the measured values of the 6 cement density probes are normalized.
Drawings
Fig. 1 is a schematic structural diagram of a calibration device in an embodiment of the present invention.
Wherein, 1, a sleeve; 2. a sandstone formation module; 3. cement sheath with same density; 4. a cement density logging instrument to be calibrated; 5. a detection device; 6. a guide wheel; 7. a guide tube.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, a calibration device for a cement density logging instrument comprises a sleeve 1 and a sandstone formation module 2, wherein the sleeve 1 is buried in the sandstone formation module 2, a cement ring 3 with the same density is arranged between the sleeve 1 and the sandstone formation module 2, water is injected into the sleeve 1, the sleeve 1 is internally used for placing a cement density logging instrument 4 to be calibrated, and the cement density logging instrument 4 to be calibrated is connected to a detection device 5 through a lead. The sleeve 1 is made of steel material, and can be specifically made of steel pipe.
The depth of the sleeve 1 is larger than the length of the cement density logging instrument 4 to be calibrated, and the cement density logging instrument 4 to be calibrated can be completely immersed in the sleeve 1.
Specifically, the sandstone stratum module 2 is made of rock blocks or sandstone concrete blocks, as shown in fig. 1, a plurality of rock blocks or sandstone concrete blocks are stacked to form a sandstone bottom layer structure, or a whole rock block or sandstone concrete block is adopted, holes are formed in the rock blocks, the sleeve 1 is embedded in the holes of the rock blocks, and cement rings 3 with the same density are filled between the sleeve 1 and the rock block holes; or the sand-stone concrete blocks are built in a back-off mode to form sand-stone concrete blocks with holes, and the sleeve 1 is wrapped by the cement sheath 3 with the same density during building; the aim is to form a simulated stratum structure and improve the calibration safety. The cement sheath 3 with the same density adopts a cement sheath structure with uniform overall density.
The guide positioning device is arranged above the sleeve 1 and comprises a guide wheel 6, a guide belt is arranged on the guide wheel 6, one end of the guide belt is wound on the guide wheel 6, the other end of the guide belt is fixedly connected to a cement density logging instrument 4 to be calibrated, the cement density logging instrument 4 to be calibrated is vertically placed into the sleeve 1 by using the guide wheel 6, a cement density count value obtained by detecting the cement density logging instrument to be calibrated in the sleeve 1 is obtained through a detection device 5, so that the numerical values of probes at different positions of the cement density logging instrument to be calibrated can be obtained, the average value of data obtained by 6 probes at different positions is obtained, the ratio of the average value to the numerical value of each probe is a calibration coefficient of the probe, the actual cement count value obtained by each probe is multiplied by the calibration coefficient, and the normalized count value of each probe is obtained.
As shown in fig. 1, a guide pipe 7 is arranged at the lower end of the guide wheel 6, a guide belt is wound on the guide wheel 6, one end of the guide belt penetrates through the guide pipe 7 and is fixedly connected with one end of the cement density logging instrument 4 to be calibrated, the guide pipe 7 and the sleeve 1 are coaxially arranged, and the guide pipe 7 is fixed right above the sleeve. Utilize the stand pipe can be fast accurate will treat to mark cement density logger 4 and put into sleeve 1 in, prevent to treat to mark cement density logger 4 and rock when putting into.
The cement density logger calibration method based on the cement density logger calibration device comprises the following steps:
s1, communicating the cement density logging instrument to be calibrated with the detection device through a lead, and then fixedly connecting one end of the cement density logging instrument to be calibrated with the guide belt;
s2, placing the cement density logging instrument to be calibrated into the sleeve by using a guide wheel structure, completely immersing the cement density logging instrument to be calibrated into the sleeve 1, and injecting water into the sleeve to enable the water surface to be higher than the upper end surface of the cement density logging instrument to be calibrated;
s3, acquiring cement density count values of 6 probes on the cement density logging instrument to be calibrated through a detection device, and calculating the average value of the cement density count values of the 6 probes; and (4) calculating the ratio of the average value to each cement density meter value to obtain the calibration coefficient of each probe, and completing the calibration of the cement density logging instrument to be calibrated. The method of the invention is simple, when the cement density outside the casing is the same, the 6 counting values should be consistent, because 6 probes and 6 matched detection circuits are different, the actually measured 6 counting values are inconsistent, the measurement result is inconsistent with the reality, the device of the invention can calibrate each probe of the cement density logging instrument to be calibrated, the detection precision of the cement density logging instrument to be calibrated is improved, the structure is simple, the safety and the reliability are realized, the 6 counting values are consistent after the calibration of the calibration device, the satisfactory measurement result can be obtained without complicated calibration detection, and the production and manufacturing cost is saved. In the detection process, the calibration coefficient of each probe is multiplied by the detected count value to obtain the count value of the probe normalization, the operation is convenient and precise, and the measured values of the 6 cement density probes are normalized.
Claims (10)
1. The utility model provides a cement density logger calibration device, a serial communication port, including sleeve (1) and sandstone stratum module (2), sleeve (1) is buried underground in sandstone stratum module (2), be equipped with same density cement ring (3) between sleeve (1) and sandstone stratum module (2), it has water to annotate in sleeve (1), be used for placing in sleeve (1) and wait to mark the cement density logger, wait to mark cement density logger (4) and pass through the wire and connect in detection device (5).
2. A cement density logging instrument calibration device according to claim 1, characterized in that the depth of the sleeve (1) is greater than the length of the cement density logging instrument (4) to be calibrated, and the cement density logging instrument (4) to be calibrated can be completely immersed in the sleeve (1).
3. A cement density logger calibration device as claimed in claim 1, characterised in that the sandstone formation module (2) is of rock or sandstone concrete.
4. A calibration arrangement for a cement density logging instrument as claimed in claim 3, wherein a plurality of rock blocks or gravel concrete blocks are stacked to form a sandstone substructure, or a single block of rock blocks or gravel concrete blocks is used.
5. A calibration device for a cement density logging instrument according to claim 4, characterized in that the rock block is provided with holes, the sleeve (1) is embedded in the holes of the rock block, and the cement sheath (3) with the same density is filled between the sleeve (1) and the holes of the rock block.
6. A cement density logger calibration device as claimed in claim 4, characterized in that a sand concrete block is used to form a sand concrete block with holes, and the cement sheath (3) of the same density is wrapped around the outside of the sleeve (1).
7. The calibration device for the cement density logging instrument according to the claim 1, characterized in that a guiding and positioning device is arranged above the sleeve (1), the guiding and positioning device comprises a guide wheel (6), a guide belt is arranged on the guide wheel (6), one end of the guide belt is wound on the guide wheel (6), and the other end of the guide belt is fixedly connected to the cement density logging instrument (4) to be calibrated.
8. The calibration device for the cement density logger according to claim 1, characterized in that the lower end of the guide wheel (6) is provided with a guide tube (7), the guide belt is wound on the guide wheel (6), and one end of the guide belt passes through the guide tube (7) and is fixedly connected with one end of the cement density logger (4) to be calibrated.
9. A calibration method of a cement density logging instrument based on the calibration device of the cement density logging instrument of claim 7 is characterized by comprising the following steps:
s1, communicating the cement density logging instrument to be calibrated with the detection device through a lead, and then fixedly connecting one end of the cement density logging instrument to be calibrated with the guide belt;
s2, placing the cement density logging instrument to be calibrated into the sleeve by using a guide wheel structure, and injecting water into the sleeve;
s3, acquiring cement density count values of 6 probes on the cement density logging instrument to be calibrated through a detection device, and calculating the average value of the cement density count values of the 6 probes; and calculating the ratio of the average value to each cement density count value to obtain the calibration coefficient of each probe, thereby completing the calibration of the cement density logging instrument to be calibrated.
10. The method for calibrating the cement density logger according to claim 10, wherein the cement density logger to be calibrated is completely immersed in the sleeve, water is injected into the sleeve, the water level is higher than the upper end surface of the cement density logger to be calibrated, the count value of each probe is obtained by detecting the calibrated cement density logger, and the calibration coefficient of each probe is multiplied by the count value obtained by detecting the calibration coefficient, so as to obtain the count value normalized by the probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011445828.XA CN112554866A (en) | 2020-12-11 | 2020-12-11 | Calibration device and calibration method for cement density logging instrument |
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| CN202011445828.XA CN112554866A (en) | 2020-12-11 | 2020-12-11 | Calibration device and calibration method for cement density logging instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104825A (en) * | 1986-06-07 | 1987-12-16 | 施卢默格海外有限公司 | The well logger of band accelerator neutron generator |
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| CN200961479Y (en) * | 2006-10-28 | 2007-10-17 | 辽河石油勘探局 | Gamma logging device graduation device for density and thickness |
| CN201763313U (en) * | 2010-07-23 | 2011-03-16 | 中国石油化工集团公司 | Calibrating device for pulsed neutron logging tool |
| US20150316681A1 (en) * | 2014-05-05 | 2015-11-05 | Vale S.A. | Method and system for evaluation of gamma-gamma well logging data in mineral exploration |
| WO2016040133A1 (en) * | 2014-09-10 | 2016-03-17 | Halliburton Energy Services, Inc. | Multi-variable workflow for cement evaluation in multiple casing strings |
| CN105649606A (en) * | 2014-08-07 | 2016-06-08 | 中国石油大学(北京) | Compensation type calibration method of probe consistency of multi-probe acoustic waveamplitude logger |
| CN105888647A (en) * | 2016-04-27 | 2016-08-24 | 长江大学 | Calibration method and device of acoustic variable density logging instrument |
| CN106522919A (en) * | 2016-11-07 | 2017-03-22 | 中国石油大学(北京) | Three-detector density logging surrounding rock correcting method and device |
| US20180217293A1 (en) * | 2015-10-22 | 2018-08-02 | Halliburton Energy Services, Inc. | API Unit Calibration of Gamma Ray Logging Tools Using Simulated Data |
| CN109899055A (en) * | 2019-03-14 | 2019-06-18 | 陕西华晨石油科技有限公司 | A kind of sector acoustic logging instrument caliberating device and scaling method |
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2020
- 2020-12-11 CN CN202011445828.XA patent/CN112554866A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104825A (en) * | 1986-06-07 | 1987-12-16 | 施卢默格海外有限公司 | The well logger of band accelerator neutron generator |
| FR2658616A1 (en) * | 1990-02-20 | 1991-08-23 | Schlumberger Prospection | METHOD AND DEVICE FOR EVALUATING THE CEMENT IN A WELL AND CEMENT THAT CAN BE USED IN SUCH A PROCESS. |
| CN1115001A (en) * | 1994-07-15 | 1996-01-17 | 西安石油勘探仪器总厂 | Radioactive energy spectrum tracing water uptake section well logging method |
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