CN107476802A - A kind of neutron well logging instrument - Google Patents

A kind of neutron well logging instrument Download PDF

Info

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Withdrawn
Application number
CN201710765800.6A
Other languages
Chinese (zh)
Inventor
葛良全
曾国强
郭生良
张庆贤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Newray Technology Co Ltd
Original Assignee
Chengdu Newray Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chengdu Newray Technology Co Ltd filed Critical Chengdu Newray Technology Co Ltd
Priority to CN201710765800.6A priority Critical patent/CN107476802A/en
Publication of CN107476802A publication Critical patent/CN107476802A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing 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

A kind of neutron well logging instrument
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.
CN201710765800.6A 2017-08-30 2017-08-30 A kind of neutron well logging instrument Withdrawn CN107476802A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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