CN201137491Y - Pulse neutron double-spectrum fluid saturation logging tool - Google Patents
Pulse neutron double-spectrum fluid saturation logging tool Download PDFInfo
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- CN201137491Y CN201137491Y CN 200720032424 CN200720032424U CN201137491Y CN 201137491 Y CN201137491 Y CN 201137491Y CN 200720032424 CN200720032424 CN 200720032424 CN 200720032424 U CN200720032424 U CN 200720032424U CN 201137491 Y CN201137491 Y CN 201137491Y
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Abstract
The utility model relates to a pulse neutron bi-spectrum fluid saturation logging tool, for resolving the technical problems of prior neutron-gamma test mode such as failure of quantitative expression at the condition of low water salinity and porosity of ground layer and failure of the information relative to the trapped radiation in the lithology and fluid. The utility model comprises a logging tool shell in which a pulse neutron generator, a thermal neutron detector, a trapped gamma detector and a natural gamma detector are provided from down to up. The pulse neutron bi-spectrum fluid saturation logging tool has the advantages of complete information acquisition, wide adaptation range for the water salinity of ground layer, multiple selective modes for qualitative identification of oil gas water layer, comprehensive result explanation, limited multiplicity, high accuracy of residual oil gas and water saturation, high time efficiency and high economic benefit.
Description
Technical field
The utility model relates to a kind of pulsed neutron log instrument.
Background technology
The pulsed neutron log instrument that extensively adopts can only be measured the gamma ray that neutron excites at present, and the counting rate that records is proportional to the thermal neutron attenuation rate and the product of whenever capturing the gammaphoton number of a thermal neutron average emitted in the stratum.Have only when the stratum water salinity is higher greater than 50000ppm and degree of porosity, residue oil gas and the water saturation obtained with this pattern could satisfy the accuracy that oil well logging requires.And formation water salinity is low and degree of porosity when also low the stratum thermal-neutron lifetime long, interior captive thermal neutron of unit interval is few, the gammaphoton of generation is few, and is unfavorable to neutron-gamma survey pattern.Oil-gas field of China formation water salinity excursion is big, enters middle and advanced stage and work as waterflooding extraction, and the salinity of pore water can not be done quantitative interpretation far below this lower limit of 50000ppm with the data of this instrument collection.
The stratum thermal neutron that neutron lifetime is long is decayed slowly, and is through still having more thermal neutron long die-away time, favourable to the neutron-neutron measurement pattern of direct measurement thermal neutron.With neutron-neutron measurement pattern, formation water salinity can be done quantitative interpretation to residue oil gas and water saturation more than 10000ppm, salinity can be done qualitative interpretation between 5000～10000ppm, be low hole, hypotonic, a kind of idealized model that the regional remaining oil saturation of low mineralization is measured.But only use neutron-neutron measurement pattern, can not get the information relevant in lithology and the fluid with capture radiation.
Summary of the invention
The utility model proposes the two spectrum of a kind of pulsed neutron fluid saturation logging instrument, it has solved existing neutron-gamma survey pattern can not do quantitative interpretation when low and degree of porosity is also low at formation water salinity, and existing neutron-neutron measurement call by pattern is less than the technical problem of information relevant with capture radiation in lithology and the fluid.
Technical solution of the present utility model is:
The two spectrum of a kind of pulsed neutron fluid saturation logging instrument, comprise logging instrument housing 5, its special character is to be disposed with pulsed neutron generator 1, thermal-neutron detector 2 in the described logging instrument housing 5 from bottom to top, to capture gamma detector 3 and natural gamma probe 4.
Distance between above-mentioned thermal-neutron detector 2 and the pulsed neutron generator 1 is 300-400mm; The distance of capturing between gamma detector 3 and the pulsed neutron generator 1 is 450-550mm; Distance between natural gamma probe 4 and the pulsed neutron generator 1 is 700-1000mm.
Distance between above-mentioned thermal-neutron detector 2 and the pulsed neutron generator 1 is 350mm; The distance of capturing between gamma detector 3 and the pulsed neutron generator 1 is 500mm; Distance between natural gamma probe 4 and the pulsed neutron generator 1 is 900mm.
Above-mentioned thermal-neutron detector 2 is
3The He counting tube; The described gamma detector 3 of capturing is scintillation spectrometer; Described natural gamma probe 4 is a scintillation spectrometer.
The advantage that the utlity model has is:
(1) can measure thermal neutron simultaneously and capture the gamma time spectrum, carry out time domain-age field conversion in real time, and realize that time spectrum and life spectrum realtime graphic show, quicklook identification oil-gas-water layer.Utilize the dual-time spectrum to ask stratum neutron lifetime or its macroscopic cross section, verification restriction multi-solution improves the confidence level of quantitatively calculating stratum remaining oil gas saturation mutually.Can distinguish water layer and potentiality layer through analysis-by-synthesis, estimate the water flooded grade of payzone, understanding oil reservoir rule of waterflooding is sought water exit, improves measure effect, for water-control oil-increasing provides foundation.Also can be used for checking cementing quality, seek and scurry groove and loss horizon.
(2) thermal neutron be can write down simultaneously and gamma gross-count rate, time gate and energy window counting rate and ratio thereof captured.The useful information that makes full use of the different time road and can window comprise in the counting rate can be used for discerning oil-gas-water layer as gamma and thermal neutron counting rate and ratio thereof, seeks the leakage gas-bearing formation, checks and annotates ash, plugging effect, oil identification etc. between salt.That utilizes homogeneous to go into the well to gather captures gamma spectra, natural gamma spectra and auxiliary informations such as well temperature, pressure and casing coupling, can obtain useful informations such as the needed lithology of quantitative interpretation, fluid salinity and borehole environment.
(3) once going into the well can be finished measurement tasks such as neutron neutron life time log, the well logging of neutron gamma life-span, neutron absorption gamma spectrometry log, natural gamma-ray spectrometry and well temperature, pressure, casing coupling.
Generally speaking, two kinds of measurement patterns are gathered the comprehensive function of formation mutually, make the utility model instrument have Information Monitoring comprehensively, many to the alternative mode of wide, the qualitative identification oil-gas-water layer of formation water salinity accommodation, integrated interpretation achievement multi-solution obtains restriction, remain oil gas and water saturation accuracy height, timeliness and economic benefit advantages of higher.
Description of drawings
Fig. 1 is the two spectrum of a pulsed neutron fluid saturation logging instrument structural representation;
Wherein: the 1-pulsed neutron generator, the 2-thermal-neutron detector, 3-captures gamma detector, 4-natural gamma probe, 5-logging instrument housing.
The specific embodiment
The two spectrum of the utility model pulsed neutron fluid saturation logging instrument structure is seen Fig. 1: pulsed neutron generator 1, thermal-neutron detector 2 have been installed in steel logging instrument housing 5 from bottom to top, have been captured gamma detector 3 and natural gamma probe 4.Wherein thermal-neutron detector 2 is
3The He counting tube, and the distance between the pulsed neutron generator 1 is 300-400mm; Capture gamma detector 3 and be scintillation spectrometer, and the distance between the pulsed neutron generator 1 is 450-550mm; Natural gamma probe 4 also is a scintillation spectrometer, from pulsed neutron generator 700-1000mm.The two spectrum of pulsed neutron saturation ratio logging instrument also can comprise thermometer, pressure gauge and casing collar locator (CCL).
Parameter of the present utility model is as follows:
1] accelerator for neutron production yield: 〉=1.5 * 10
8N/s;
2] thermal-neutron detector:
3The He counter, spacing 300-400mm;
3] neutron gamma detector: scintillation spectrometer, spacing 450-550mm;
4] natural gamma probe: scintillation spectrometer, measuring point is away from the sphere of action of neutron source;
5] ∑ measurement category: 7.6～91C.U.;
6] recommend to test the speed: 360m/h;
7] shell is withstand voltage: 80MPa;
8] certainty of measurement: ± 2%.
The utility model principle: by the neutron current of pulsed neutron generator intermittent transmission energy 14MeV, change thermal neutron into through slowing down after the two spectrum of pulsed neutron fluid saturation logging instrument is gone into the well, thermal neutron is captured and inspires capture gamma ray.Gather thermal neutron time spectrum with thermal-neutron detector, capture gamma time spectrum and gamma spectra, gather natural gamma spectra with the natural gamma probe with the collection of flicker gamma detector.Treatedly determine stratum remaining oil gas and water saturation.The utility model core technology is with the thermal neutron time spectrum of gathering simultaneously under the equivalent environment and captures the gamma time spectrum, realized the mutual supplement with each other's advantages of two kinds of nuclear logging responses, widened accommodation, improved measuring accuracy residue oil gas and water saturation to formation water salinity.
The two spectrum of pulsed neutron saturation ratio logging instrument can be operated under NTS pattern, CTS pattern, three kinds of measurement patterns of DTS pattern, and wherein the NTS pattern is only gathered thermal neutron time spectrum; CTS pattern-only gather and capture the gamma time spectrum; The DTS pattern can be gathered thermal neutron time spectrum simultaneously and be captured the gamma time spectrum.
The utility model instrument has been optimized the work schedule of instrument by theoretical research, Monte Carlo numerical simulation and the analog computation of master scale well, and can be from the variation of motion tracking formation macro capture cross-section.Neutron burst is equal to or greater than the stratum thermal-neutron lifetime perdurabgility, and thermal neutron can effectively be accumulated in investigative range; The NEUTRON EMISSION intermittent time is 3-5 a times of stratum neutron lifetime, and the oil-gas Layer long in neutron lifetime also can obtain complete time spectrum.
The utility model instrument adopts advanced filtering method to improve signal to noise ratio, and log repeatability is good.Carry out data based on multiscale analysis method and handle, fully merge various well logging informations, improved the well log interpretation coincidence rate.The storage raw measurement data is so that post processing.
The utility model instrument accelerator for neutron production control system is optimized, and presses voltage stabilizing technique to guarantee the stability of neutron yield with the neutron tube target of original creation.
Claims (4)
1, the two spectrum of a kind of pulsed neutron fluid saturation logging instrument, comprise logging instrument housing (5), it is characterized in that: be disposed with pulsed neutron generator (1), thermal-neutron detector (2) in the described logging instrument housing (5) from bottom to top, capture gamma detector (3) and natural gamma probe (4).
2, the two spectrum of pulsed neutron according to claim 1 fluid saturation logging instrument, it is characterized in that: the distance between described thermal-neutron detector (2) and the pulsed neutron generator (1) is 300-400mm; The distance of capturing between gamma detector (3) and the pulsed neutron generator (1) is 450-550mm; Distance between natural gamma probe (4) and the pulsed neutron generator (1) is 700-1000mm.
3, the two spectrum of pulsed neutron according to claim 2 fluid saturation logging instrument, it is characterized in that: the distance between described thermal-neutron detector (2) and the pulsed neutron generator (1) is 350mm; The distance of capturing between gamma detector (3) and the pulsed neutron generator (1) is 500mm; Distance between natural gamma probe (4) and the pulsed neutron generator (1) is 900mm.
4, according to claim 1 or the two spectrum of 2 or 3 described pulsed neutrons fluid saturation logging instrument, it is characterized in that: described thermal-neutron detector (2) is
3The He counting tube; The described gamma detector (3) of capturing is a scintillation spectrometer; Described natural gamma probe (4) is a scintillation spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720032424 CN201137491Y (en) | 2007-08-02 | 2007-08-02 | Pulse neutron double-spectrum fluid saturation logging tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720032424 CN201137491Y (en) | 2007-08-02 | 2007-08-02 | Pulse neutron double-spectrum fluid saturation logging tool |
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| Publication Number | Publication Date |
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| CN201137491Y true CN201137491Y (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200720032424 Expired - Lifetime CN201137491Y (en) | 2007-08-02 | 2007-08-02 | Pulse neutron double-spectrum fluid saturation logging tool |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094644A (en) * | 2011-01-14 | 2011-06-15 | 太平洋远景石油技术(北京)有限公司 | Method for evaluating TNIS sleeve-penetrating imaging reservoir fluid |
| CN101603421B (en) * | 2009-07-13 | 2013-04-10 | 新疆鑫诚信石油技术服务有限公司 | Gamma radiation logging along drilling method for petroleum drilling fluid |
| CN105672981A (en) * | 2016-01-11 | 2016-06-15 | 沈阳弗雷泽物探技术有限公司 | High-precision oil-well residual oil gas logging instrument based on controllable source technology and method |
| CN106761675A (en) * | 2016-12-16 | 2017-05-31 | 中国石油天然气股份有限公司 | Pulsed neutron log method and device |
| CN108333638A (en) * | 2018-04-18 | 2018-07-27 | 四川久天测控技术有限公司 | A kind of minor diameter C/Hratio saturation degree downhole instrument and logging instrument system |
| CN112302622A (en) * | 2020-10-29 | 2021-02-02 | 大庆油田有限责任公司 | Method for comprehensively explaining residual oil saturation by pulse neutron full-spectrum logging |
-
2007
- 2007-08-02 CN CN 200720032424 patent/CN201137491Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603421B (en) * | 2009-07-13 | 2013-04-10 | 新疆鑫诚信石油技术服务有限公司 | Gamma radiation logging along drilling method for petroleum drilling fluid |
| CN102094644A (en) * | 2011-01-14 | 2011-06-15 | 太平洋远景石油技术(北京)有限公司 | Method for evaluating TNIS sleeve-penetrating imaging reservoir fluid |
| CN105672981A (en) * | 2016-01-11 | 2016-06-15 | 沈阳弗雷泽物探技术有限公司 | High-precision oil-well residual oil gas logging instrument based on controllable source technology and method |
| CN106761675A (en) * | 2016-12-16 | 2017-05-31 | 中国石油天然气股份有限公司 | Pulsed neutron log method and device |
| CN108333638A (en) * | 2018-04-18 | 2018-07-27 | 四川久天测控技术有限公司 | A kind of minor diameter C/Hratio saturation degree downhole instrument and logging instrument system |
| CN112302622A (en) * | 2020-10-29 | 2021-02-02 | 大庆油田有限责任公司 | Method for comprehensively explaining residual oil saturation by pulse neutron full-spectrum logging |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 710061 Shaanxi province Xi'an Cuihua Jialin Road No. 254 building room 205 Patentee after: Xi'an Austrian electronic instrument Limited by Share Ltd Patentee after: China Petroleum University (East China) Address before: 710061 Shaanxi province Xi'an Cuihua Jialin Road No. 254 building room 205 Patentee before: Xi'an Aohua Electronic Instrument Co., Ltd. Patentee before: China Petroleum University (East China) |
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| CX01 | Expiry of patent term |
Granted publication date: 20081022 |
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| CX01 | Expiry of patent term |