CN203175538U - Lithological density logger detector - Google Patents
Lithological density logger detector Download PDFInfo
- Publication number
- CN203175538U CN203175538U CN 201320076923 CN201320076923U CN203175538U CN 203175538 U CN203175538 U CN 203175538U CN 201320076923 CN201320076923 CN 201320076923 CN 201320076923 U CN201320076923 U CN 201320076923U CN 203175538 U CN203175538 U CN 203175538U
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- receiving crystal
- helmet
- probe
- emission source
- litho
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Abstract
The utility model relates to a lithological density logger detector which comprises a detector outer shell, a protective cap, a gamma emission source, a source bin fixing shell, a short spacing receiving crystal and a long spacing receiving crystal. Long spacing from the gamma emission source to the center of the long spacing receiving crystal is 375.92mm millimeters, and short spacing from the gamma emission source to the center of the short spacing receiving crystal is 153.67millimeters. the counting rate is commonly improved by more than one time through correction selection of the spacing, the counting rate is improved by more than two times in a stratum larger than 2.7 grams per cubic centimeter, statistical fluctuation is greatly reduced, measurement accuracy is superior to measurement accuracy in the prior art by 0.025 gram per cubic centimeter, and repeatability is greatly improved.
Description
Technical field
The utility model relates to the oil well logging field, is specifically related to a kind of litho-density tool probe.
Background technology
Litho-density tool is mainly measured the bulk density ρ on stratum and the photoelectric absorption index Pe on stratum, and the numerical value that is directly obtained by instrument is the counting rate N of each energy window
x, calculate by conversion, finish the measurement that measures ρ and Pe by energy window counting rate.
Statistic fluctuation can be expressed as with relative error: σ=1/N
x 1/2Work as N
xWhen more big, σ is more little, and statistic fluctuation is more little, and then Instrument measuring precision is more high.N
x-counting rate when looking spacing and being L, L is true spacing (being the long space of logging instrument), the L value is more little, then the N of apparatus measures
xMore big, therefore in the scope that sensitivity allows, shorten long space as far as possible, can keep higher counting N
x
The LDS long space of prior art is 16 inches, and the probe short space is 7.25 inches, because the detector-source distance is long, thereby has reduced the respectively counting rate value of energy window, causes the decline of Instrument measuring precision, has directly influenced the normal use of instrument; And probing shell is exposed in the elasticity of prior art volume pin end, is unfavorable for safe handling.
Summary of the invention
The purpose of this utility model provides a kind of litho-density tool probe that can improve Instrument measuring precision.
For achieving the above object, the technical solution of the utility model is as follows:
A kind of litho-density tool probe, comprise probe body, helmet, γ emission source, storehouse, source set casing, short space receiving crystal, long space receiving crystal, γ emission source and storehouse, source set casing are fixed in the helmet, helmet is connected the probe body end, length spacing receiving crystal is fixed on probe body inside, long space from the γ emission source to long space receiving crystal center is 375.92 millimeters, and the short space from the γ emission source to short space receiving crystal center is 153.67 millimeters.
In such scheme, described joining between helmet and storehouse, source set casing made flexible volume pin.
In such scheme, described elasticity volume pin connects helmet and storehouse, source set casing, and volume pin end is by the probing shell covering protection.
In such scheme, described γ emission source and storehouse, source set casing are fixed in the helmet by screw, volume pin.
In such scheme, described helmet is connected the probe body end by alignment pin and screw.
In such scheme, described length spacing receiving crystal is fixed on probe body inside with dog screw and sleeve.
The utility model is significantly increased counting rate by the correct spacing of selecting, thereby improves Instrument measuring precision, minimizing statistic fluctuation.
Description of drawings
Fig. 1 is the partial sectional view of the litho-density tool probe that provides of the utility model embodiment.
Fig. 2 is that the litho-density tool probe that provides of the utility model embodiment is along A-A direction sectional view.
Among the figure: probe body 1, helmet 2, γ emission source 3, storehouse, source set casing 4, short space receiving crystal 5, long space receiving crystal 6, elasticity volume pin 7.
The specific embodiment
Below in conjunction with drawings and Examples the technical solution of the utility model is described in detail.
As shown in Figure 1, the litho-density tool probe comprises probe body 1, helmet 2, γ emission source 3, storehouse, source set casing 4, short space receiving crystal 5, long space receiving crystal 6, being 14.8 inches (375.92 millimeters) from γ emission source 3 to the long space between the long space receiving crystal 6, is 6.05 inches (153.67 millimeters) from γ emission source 3 to the short space between the short space receiving crystal 5.
As shown in Figure 2; between helmet 2 and storehouse, source set casing 4, join and make flexible volume pin 7; to make things convenient for the location of storehouse, source set casing 4; elasticity volume pin 7 ends are by the probing shell covering protection; exposing housing with the volume pin of prior art compares outward; make probe be not easy in use to bump or scratch, increased safety.
Long space receiving crystal 6 and short space receiving crystal 5 usefulness dog screws and sleeve are fixed on probe body 1 inside.
In the litho-density tool device course of work, the probe that the telescoping ram of instrument will be equipped with the sniffer that gamma ray projector and two spacings do not wait is adjacent to the borehole wall, gamma-rays and the formation material sent by gamma ray projector produce interaction, the spacing place that is determining, two sniffers are surveyed entering into separately the scattering γ photon of investigative range respectively, directly obtain the counting rate of each energy window, calculate through conversion again, finish the measurement that measures formation bulk density ρ and photoelectric absorption index Pe by energy window counting rate.
The utility model generally improves more than 1 times counting rate by the correct spacing of selecting, greater than 2.7g/cm
3The stratum, can window counting rate improve more than 2 times, greatly reduce statistic fluctuation, certainty of measurement is better than the certainty of measurement 0.025g/cm of prior art
3Index reaches 0.02g/cm
3It is very big (repeated namely under identical measuring condition that repeatability is improved, for the stability checking and confirm downhole probe is measured the situation that the curve of generation overlaps again to same interval, the height of radioactive logging counting is an important indicator of repeatability, σ=1/N is described with statistic fluctuation
x 1/2, N
xMore big, then fluctuation is more little, and the repeatability of measuring curve is more high), particularly to improve effect obvious for the measurement curve repeatability of Pe.The instrument integral level meets or exceeds 5700 instrument levels.
It should be noted last that, the above specific embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to example the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (6)
1. litho-density tool probe, it is characterized in that: comprise probe body, helmet, γ emission source, storehouse, source set casing, short space receiving crystal, long space receiving crystal, γ emission source and storehouse, source set casing are fixed in the helmet, helmet is connected the probe body end, length spacing receiving crystal is fixed on probe body inside, long space from the γ emission source to described long space receiving crystal center is 375.92 millimeters, and the short space from the γ emission source to described short space receiving crystal center is 153.67 millimeters.
2. litho-density tool probe as claimed in claim 1 is characterized in that: join between described helmet and storehouse, the source set casing and make flexible volume pin.
3. litho-density tool probe as claimed in claim 2 is characterized in that: described elasticity volume pin connects helmet and storehouse, source set casing, and volume is sold the end by the probing shell covering protection.
4. litho-density tool probe as claimed in claim 1 is characterized in that: described γ emission source and storehouse, source set casing are fixed in the helmet by screw, volume pin.
5. litho-density tool probe as claimed in claim 1, it is characterized in that: described helmet is connected the probe body end by alignment pin and screw.
6. litho-density tool probe as claimed in claim 1, it is characterized in that: described length spacing receiving crystal is fixed on probe body inside with dog screw and sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076923 CN203175538U (en) | 2013-02-19 | 2013-02-19 | Lithological density logger detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076923 CN203175538U (en) | 2013-02-19 | 2013-02-19 | Lithological density logger detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203175538U true CN203175538U (en) | 2013-09-04 |
Family
ID=49072253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320076923 Expired - Fee Related CN203175538U (en) | 2013-02-19 | 2013-02-19 | Lithological density logger detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203175538U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894564A (en) * | 2020-07-07 | 2020-11-06 | 中国石油大学(华东) | Method for calculating formation photoelectric absorption cross-section index based on X-ray lithology density logging |
-
2013
- 2013-02-19 CN CN 201320076923 patent/CN203175538U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894564A (en) * | 2020-07-07 | 2020-11-06 | 中国石油大学(华东) | Method for calculating formation photoelectric absorption cross-section index based on X-ray lithology density logging |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20220219 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |