CN107476802A - A kind of neutron well logging instrument - Google Patents
A kind of neutron well logging instrument Download PDFInfo
- Publication number
- CN107476802A CN107476802A CN201710765800.6A CN201710765800A CN107476802A CN 107476802 A CN107476802 A CN 107476802A CN 201710765800 A CN201710765800 A CN 201710765800A CN 107476802 A CN107476802 A CN 107476802A
- Authority
- CN
- China
- Prior art keywords
- neutron
- thermal
- detector
- pulsed
- logging instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000007405 data analysis Methods 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 229910052722 tritium Inorganic materials 0.000 claims description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 claims 1
- 229910052805 deuterium Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Radiation (AREA)
Abstract
The present invention relates to logging instrument technical field, and in particular to a kind of neutron well logging instrument, including pulsed neutron source, detector group, the front-end circuitry for Compensated Neutron Log Tool and the data analysis module that data are surveyed for obtaining；Detector group includes the first thermal-neutron detector, the second thermal-neutron detector and the 3rd thermal-neutron detector, wherein the first thermal-neutron detector is nearest away from pulsed neutron source, away from pulsed neutron source farther out, the 3rd thermal-neutron detector is farthest away from pulsed neutron source for second thermal-neutron detector；The front-end circuitry includes charge amplifier, the differentiating amplifier coupled with charge amplifier, comparator and pulse shaper.
Description
Technical field
The invention belongs to logging instrument technical field, and in particular to a kind of neutron well logging instrument.
Background technology
In recent years, conventional oil yield has been enter into downward trend, and as international oil price remains high, unconventional energy resource
Exploration and development has caused the great attention of domestic outer energy circle.Unconventionaloil pool in the proportion shared by global Oil Gas yield increasingly
Greatly, important role is play in global energy structure.
Tight gas are a kind of important unconventional gas resources, are referred in low hole-hypotonic or even super low porosity permeability sandstone storage
In layer, without natural production capacity, either natural production capacity is very low, it is necessary to could form industrial gas by pressure break or any special measures
Natural gas pool.But due to the features such as fine and close gas reservoir matrix mineral is complicated, anisotropism is strong, deposited in tight gas reservoir evaluation
In very big difficulty.
Domestic and foreign scholars once utilized Reservoir Performance Monitor (RPM), thermal decay time tool (TDT), cross sleeve pipe
The loggers such as resistivity logging (CHRF), nuclear magnetic resonance log (NMR) and technology evaluation tight gas reservoir, but evaluation effect is not
It is good, it is impossible to tight gas reservoir gas saturation quantitative assessment.
The content of the invention
It is an object of the invention to provide the neutron well logging instrument that a kind of display screen can freely adjust angle.
To reach above-mentioned requirements, the present invention adopts the technical scheme that：A kind of neutron well logging instrument is provided, including in pulse
Component, detector group, the front-end circuitry for Compensated Neutron Log Tool and the data analysis that data are surveyed for obtaining
Module；Detector group includes the first thermal-neutron detector, the second thermal-neutron detector and the 3rd thermal-neutron detector, wherein first
Thermal-neutron detector is nearest away from pulsed neutron source, the second thermal-neutron detector away from pulsed neutron source farther out, the 3rd thermal neutron detection
Device is farthest away from pulsed neutron source；The front-end circuitry includes：Charge amplifier, coupled with detector group with will be by visiting
The charge signal for surveying the output of device group is transformed into voltage signal：Differentiating amplifier, couple with charge amplifier and amplified with differential
The voltage signal is to obtain the first medium voltage；Comparator, for first medium voltage and adjustable threshold voltage
To obtain pulse signal, the pulse signal has the time cycle of change；Pulse shaper, for the pulse signal
Shaping is carried out to obtain width identical pulse signal, the width identical pulse signal is sent to the data analysis mould
Block.
Compared with prior art, the present invention has advantages below：The present invention produces neutron, profit using D-T pulsed neutron sources
Recorded with 3 thermal-neutron detectors and hanker sub-count at diverse location, formation gas bearing can be quantitatively determined according to sub-count is hankered
Saturation degree；Particularly preferably counted and the 3rd thermal-neutron detector count ratio and the second thermal neutron using the first thermal-neutron detector
The difference of explorer count and the 3rd thermal-neutron detector count ratio quantitatively determines formation gas bearing saturation degree, its sensitivity than
Will be high using the difference of other different detector ratios or ratio, evaluated available for tight gas reservoir gas saturation.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, the part of the application is formed, at this
Same or analogous part, the schematic description and description of the application are represented using identical reference number in a little accompanying drawings
For explaining the application, the improper restriction to the application is not formed.In the accompanying drawings：
Fig. 1 is the structural representation of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the application clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail.For the sake of simplicity, eliminate that well known to a person skilled in the art some skills in describing below
Art feature.
As shown in figure 1, the present embodiment provides a kind of neutron well logging instrument, including pulsed neutron source, detector group, for mending
Repay the front-end circuitry of neutron well logging instrument and the data analysis module of data is surveyed for obtaining；Detector group includes first
Thermal-neutron detector, the second thermal-neutron detector and the 3rd thermal-neutron detector, wherein the first thermal-neutron detector is away from pulse
Component is nearest, and away from pulsed neutron source farther out, the 3rd thermal-neutron detector is farthest away from pulsed neutron source for the second thermal-neutron detector；Institute
Stating front-end circuitry includes：Charge amplifier, the charge signal will be exported by detector group is coupled with detector group
It is transformed into voltage signal：Differentiating amplifier, coupled with charge amplifier and the voltage signal is amplified with differential to obtain the
One medium voltage；Comparator, for first medium voltage and adjustable threshold voltage to obtain pulse signal, the arteries and veins
Rushing signal has the time cycle of change；Pulse shaper, for carrying out shaping to the pulse signal to obtain width phase
Same pulse signal, the width identical pulse signal are sent to the data analysis module.
The neutron well logging instrument also includes communication unit, for receiving ground order and being sent to data analysis module, and
The porosity data of data analysis module is sent to ground system.
The pulsed neutron source of the neutron well logging instrument includes deuterium-tritium reaction neutron tube.
Above example only represents the several embodiments of the present invention, and its description is more specific and detailed, but can not manage
Solve as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, this hair is not being departed from
On the premise of bright design, various modifications and improvements can be made, these belong to the scope of the present invention.Therefore the present invention
Protection domain should be defined by claim.
Claims (3)
1. a kind of neutron well logging instrument, it is characterised in that including pulsed neutron source, detector group, for CNT
The front-end circuitry of device and the data analysis module that data are surveyed for obtaining；Detector group includes the first thermal neutron detection
Device, the second thermal-neutron detector and the 3rd thermal-neutron detector, wherein the first thermal-neutron detector is nearest away from pulsed neutron source, the
Away from pulsed neutron source farther out, the 3rd thermal-neutron detector is farthest away from pulsed neutron source for two thermal-neutron detectors；The front-end circuit
System includes：
Charge amplifier, coupled with detector group so that the charge signal exported by detector group is transformed into voltage signal；
Differentiating amplifier, coupled with charge amplifier and the voltage signal is amplified with differential to obtain the first medium voltage；
Comparator, for first medium voltage and adjustable threshold voltage to obtain pulse signal, the pulse signal
Time cycle with change；
Pulse shaper, for carrying out shaping to the pulse signal to obtain width identical pulse signal, the width
Identical pulse signal is sent to the data analysis module.
2. a kind of neutron well logging instrument according to claim 1, it is characterised in that also including communication unit, for receiving
Ground order is simultaneously sent to data analysis module, and the porosity data of data analysis module is sent into ground system.
3. a kind of neutron well logging instrument according to claim 1, it is characterised in that it is anti-that the pulsed neutron source includes deuterium tritium
Answer neutron tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765800.6A CN107476802A (en) | 2017-08-30 | 2017-08-30 | A kind of neutron well logging instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765800.6A CN107476802A (en) | 2017-08-30 | 2017-08-30 | A kind of neutron well logging instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107476802A true CN107476802A (en) | 2017-12-15 |
Family
ID=60603349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710765800.6A Withdrawn CN107476802A (en) | 2017-08-30 | 2017-08-30 | A kind of neutron well logging instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107476802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108643890A (en) * | 2018-03-14 | 2018-10-12 | 中国石油大学(北京) | A kind of method of determining formation porosity |
-
2017
- 2017-08-30 CN CN201710765800.6A patent/CN107476802A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108643890A (en) * | 2018-03-14 | 2018-10-12 | 中国石油大学(北京) | A kind of method of determining formation porosity |
| CN108643890B (en) * | 2018-03-14 | 2020-05-22 | 中国石油大学(北京) | Method for determining formation porosity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103527181B (en) | A kind of with boring controllable source neutron well logging method and instrument | |
| She et al. | Shallow crustal structure of the middle‐lower Yangtze River region in eastern China from surface‐wave tomography of a large volume airgun‐shot experiment | |
| CN102454398A (en) | Gas layer and water layer recognition method for low-porosity and low-permeability reservoir | |
| CN104865614A (en) | Complicated reservoir fluid identification method based on variable skeleton parameter | |
| CN110133715A (en) | A kind of microseism seismic source location method based on the first arrival time difference and addition of waveforms | |
| CN103513287B (en) | A kind of logging method utilizing direct current controllable neutron source to calculate density of earth formations | |
| CN109521487B (en) | Method for identifying gas layer by using element gamma energy spectrum logging | |
| CN108643890A (en) | A kind of method of determining formation porosity | |
| CN2793752Y (en) | Detector array of sublogging instrument in multiple detectors | |
| CN109915127A (en) | A kind of density measuring method based on D-D controllable neutron source | |
| CN201137491Y (en) | Pulse neutron double-spectrum fluid saturation logging tool | |
| CN204832539U (en) | Active seismic sensor of high sensitivity three -component | |
| CN107476802A (en) | A kind of neutron well logging instrument | |
| CN105604538A (en) | Compensated neutron logging instrument with controllable neutron source and control circuit of same | |
| CN205317861U (en) | Three -component transition electromagnetic surveying receiver | |
| CN107829728A (en) | Multi-source is away from brill neutron porosity measurement device and its measuring method | |
| CN208521007U (en) | The dedicated intersection station equipment of seismic prospecting | |
| CN203499679U (en) | Online detection device for natural gamma information of rock debris | |
| CN202257688U (en) | Three-dimensional geologic body visual modeling and explaining system based on gravity field or magnetic field data | |
| CN108089231A (en) | Three-dimensional gradient vector method Transient Electromagnetic Apparatus and its application | |
| Cui et al. | Energy characteristics of seismic waves on Cardox blasting tube | |
| CN2737945Y (en) | Pulse neutron well logging instrument capable of synchronous making carbon-oxygen ratio and PNN well logging | |
| Xing et al. | A LWD gas-reservoir recognition method based on the inelastic gamma information of the drill collar | |
| Li et al. | Radiation signal denoising method of loaded coal-rock based on ICEEMDAN-PCK-Means-IP | |
| CN106291668A (en) | Micro logging/wave speed logging piezoelectricity system for acquiring seismic data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171215 |
|
| WW01 | Invention patent application withdrawn after publication |