GB1471788A - Two detector neutron porosity and water salinity apparatus and methods - Google Patents
Two detector neutron porosity and water salinity apparatus and methodsInfo
- Publication number
- GB1471788A GB1471788A GB1910374A GB1910374A GB1471788A GB 1471788 A GB1471788 A GB 1471788A GB 1910374 A GB1910374 A GB 1910374A GB 1910374 A GB1910374 A GB 1910374A GB 1471788 A GB1471788 A GB 1471788A
- Authority
- GB
- United Kingdom
- Prior art keywords
- neutron
- duration
- counts
- detectors
- irradiation
- 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title 1
- 230000015572 biosynthetic process Effects 0.000 abstract 4
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 abstract 3
- 238000005259 measurement Methods 0.000 abstract 2
- 238000012544 monitoring process Methods 0.000 abstract 2
- 101100234822 Caenorhabditis elegans ltd-1 gene Proteins 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 229940083599 sodium iodide Drugs 0.000 abstract 1
- 235000009518 sodium iodide Nutrition 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/107—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons
- G01V5/108—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting reflected or back-scattered neutrons the neutron source being of the pulsed type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
- G01V5/102—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole the neutron source being of the pulsed type
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
1471788 Borehole logging SCHLUMBERGER Ltd 1 May 1974 [1 May 1973] 19103/74 Heading G1A Borehole logging apparatus, operating by irradiating the formation with neutrons and monitoring (thermal) neutron populations in the formation at two locations by means of two detectors spaced at different distances along the logging tool from the neutron source, is used to measure formation porosity # and formation fluid salinity, WS by deriving a neutron population measurements ratio R and, combining this with a neutron absorption characteristic such as thermal neutron decay time # or microscopic capture cross-section #, in accordance with predetermined relationships to calculate the required quantities. In the embodiment described, Fig. 1, the near and far detectors 20, 22 are sodium-iodide scintillation crystal detectors coupled to photomultipliers monitoring 7-radiation from thermal neutron capture. Alternatively, thermal neutron sensitive detectors e.g. He-3 filled proportional counters may be used. The neutron source 18 is arranged to produce discrete pulses of 14MeV high energy neutrons of one decay time (#) duration, at intervals of 10#. The neutron population is sampled in the interval between the irradiation pulses: at 2# after the irradiation pulse has ended for a duration of #; at 3# after irradiation has ended for a 2# duration; and at 6# after irradiation has ended for 3# duration. The first and second sample period counts N 1 , F 1 and N 2 , F 2 represent neutron population counts and the third N3, F3 represent gamma backgrounds to be subtracted from N 1 and/or N 2 and F 1 and/or F 2 during calculations. # is calculated from the ratio of the net N 1 , N 2 counts by adjusting the sample intervals until the ratio equals 2À0 when the first interval is of length # and may be used to control the timing and duration of neutron source energization in order to optimize the measurement system. The neutron population function calculated is R, equal to N<SP>1</SP>-<SP>1</SP>/ 3 N 3 /F 1 +F 2 -F 3 a more accurate function than the simple ratio of the net N 1 , F 1 counts, and is calculated using the circuitry shown in Fig. 1. A suitable computation circuit for combining # (obtained from #) and R to calculate # and WS is detailed in Fig. 4 (not shown), or an appropriately programmed computer may be used. The quantities shown in Fig. 1 at 40 may be recorded on magnetic tape or visual recording apparatus. Parts of the circuit may be on the borehole tool. The invention need not be carried out using a pulsed source and measuring neutron populations in the intervals between pulses. A steady state system using a continuously operating source may be used and R obtained from counts for the near and far detectors, in which cell #, or #, is derived by other appropriate apparatus.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35615173A | 1973-05-01 | 1973-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1471788A true GB1471788A (en) | 1977-04-27 |
Family
ID=23400350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1910374A Expired GB1471788A (en) | 1973-05-01 | 1974-05-01 | Two detector neutron porosity and water salinity apparatus and methods |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1017464A (en) |
| FR (1) | FR2228227B1 (en) |
| GB (1) | GB1471788A (en) |
| MX (1) | MX3760E (en) |
| NO (1) | NO141329C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2173591A (en) * | 1985-04-01 | 1986-10-15 | S I E Inc | Pulsed neutron well-logging method |
| GB2314927A (en) * | 1996-04-15 | 1998-01-14 | Anadrill Int Sa | Measurement of porosity using neutrons |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2424551A1 (en) * | 1978-04-27 | 1979-11-23 | Texaco Development Corp | Detecting cement voids or borehole wash=out(s) - by using fast neutron source to irradiate surrounding earth formations |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462600A (en) * | 1967-01-31 | 1969-08-19 | Schlumberger Technology Corp | Pulsed and continuous neutron well logging technique |
| US3609366A (en) * | 1968-11-01 | 1971-09-28 | Schlumberger Technology Corp | Systems for neutron decay time well logging |
| US3621255A (en) * | 1969-10-02 | 1971-11-16 | Schlumberger Technology Corp | Two detector pulse neutron logging porosity technique |
-
1974
- 1974-04-18 CA CA197,803A patent/CA1017464A/en not_active Expired
- 1974-04-29 FR FR7414797A patent/FR2228227B1/fr not_active Expired
- 1974-04-30 NO NO741561A patent/NO141329C/en unknown
- 1974-04-30 MX MX74100432U patent/MX3760E/en unknown
- 1974-05-01 GB GB1910374A patent/GB1471788A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2173591A (en) * | 1985-04-01 | 1986-10-15 | S I E Inc | Pulsed neutron well-logging method |
| GB2314927A (en) * | 1996-04-15 | 1998-01-14 | Anadrill Int Sa | Measurement of porosity using neutrons |
| GB2314927B (en) * | 1996-04-15 | 1998-06-24 | Anadrill Int Sa | Neutron porosity measurement |
| AU724756B2 (en) * | 1996-04-15 | 2000-09-28 | Anadrill International, S.A. | Borehole invariant neutron porosity measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2228227A1 (en) | 1974-11-29 |
| NO141329C (en) | 1980-02-13 |
| FR2228227B1 (en) | 1976-10-15 |
| CA1017464A (en) | 1977-09-13 |
| NO741561L (en) | 1974-11-04 |
| NO141329B (en) | 1979-11-05 |
| MX3760E (en) | 1981-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19940430 |