CN202755971U - Drill-following controllable source neutron logging instrument - Google Patents
Drill-following controllable source neutron logging instrument Download PDFInfo
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- CN202755971U CN202755971U CN 201220325550 CN201220325550U CN202755971U CN 202755971 U CN202755971 U CN 202755971U CN 201220325550 CN201220325550 CN 201220325550 CN 201220325550 U CN201220325550 U CN 201220325550U CN 202755971 U CN202755971 U CN 202755971U
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Abstract
The utility model discloses a drill-following controllable source neutron logging instrument. A pulsed neutron source on a drill collar is started to emit quantitative high-energy neutrons to strata in pulse mode. A long spaced detector and a short spaced detector which are arranged on the drill collar are respectively used to detect the number of thermal neutrons scattering back to a well after decelerating through the strata. A thermal neutron macroscopic capture cross section sigma and a void ratio phi in the strata are obtained through calculation. Stratum water saturation Sw is obtained according to the thermal neutron macroscopic capture cross section and the void ratio phi. The drill-following controllable source neutron logging instrument comprises the pulsed neutron source, a detection unit, a signal processing and data analyzing unit and a power supply module, and the power supply module is used to provide power supply for the units. According to the drill-following controllable source neutron logging instrument, the long spaced 3He thermal neutron detector and the short spaced 3He thermal neutron detector are used to detect the thermal neutrons to obtain the parameter of the void ratio and the parameter of the thermal neutron macroscopic capture cross section and realize detection of water saturation and void ratios in strata which are relatively low in degree of mineralization. Utilization of the pulsed neutron source removes the damage of radioactive sources to human beings and the environment.
Description
Technical field
The utility model relates to petroleum geology exploration with the well logging during method field of boring geosteering, and is particularly a kind of with boring controllable source neutron well logging instrument.
Background technology
Well logging during is with being installed in that logger in the drill collar is measured formation properties and measurement result being sent to ground or being recorded in a kind of technology in the downhole memory in drilling process.This technical requirements logger can be installed in the space less in the drill collar, and the sharp pounding that produces can bear high temperature, high pressure and drilling well the time.The well logging during data is before the stratum is invaded by F or invade and to measure when very shallow, has more reflected stratum characteristic in objective reality ground than wireline logging.Well logging during can be determined to carry out geosteering and formation evaluation by well track in real time, has improved on-the-spot drilling well decision-making capability.Well logging during also can be carried out time-lapse logging, analyzes and invades over time, can obtain distinguishing the information of oil-water-layer.In unconventional well or under special geological environment (such as expanded clay or high pressure formation), normal cable well logging difficulty or very risky so that can not operation the time, well logging during just more shows the advantage that himself is unique.
The conventional planning logger uses the radioactivate cosmogony, and operating personnel and other biological cell are caused very major injury.When running into down hole problem and can cause bit freezing, with the instrument of radioactivate cosmogony, possibly can't regain radioactive source, cause drilling well, logging operation failure, oil well is scrapped, and usually will shunt in a well specially.Ground environment will be subject to serious radioactive pollution, need periodic monitoring.Country will increasingly stringent to the management of logging radiation-resource, and correlative charges also will significantly increase.Because the well logging during environment is more abominable, instrument and the loading and unloading of the radioactivate cosmogony time more more complicated than conventional logging, needs is longer, thereby has aggravated the radioactivate cosmogony to the pollution of environment with to operating personnel's injury.Substituting the radioactivate cosmogony with controllable neutron source can address this problem well.
That Chinese patent literature CN 2900786 discloses is a kind of " with boring deuterium deuterium controllable compensating neutron logging instrument " not with chemical source with boring controllable source neutron porosity logger, this patent is used in controllable source first and obtains on the formation porosity parameter, its use be the D-D neutron tube as with the controllable source parts that bore controllable source neutron porosity logging instrument, the neutron ray energy be 2Mev, investigation depth is 23.75cm, shortcoming is the D-D neutron tube, its neutron tube neutron yield is low, cause easily radioactivity statistic fluctuation error, certainty of measurement is lower.And what this neutron tube anode used is high direct voltage, can not measure thermal-neutron capture cross-section and water saturation.
Chinese patent literature CN102159970A discloses the method for the water saturation in a kind of definite subterranean strata, comprises the depth of invasion of measuring the rock stratum with the measurement of carrying out in a plurality of well bores in being drilled into the rock stratum.Measurement has the lateral depth of the different investigation that enters the rock stratum.Carbon and oxygen in basically identical with the position of measuring depth of invasion lengthwise position measurement rock stratum.Determine the water saturation of basically invading part of rock stratum with the carbon of measuring and oxygen and depth of invasion.Measure mesopore, stratum degree φ with the 3He proportional counter in the above-mentioned patent documentation, and the thermal-neutron capture cross-section use of measurement stratum is traditional scintillation crystal detectors, scintillation crystal detectors receives is capture gamma ray in the stratum, utilizes to capture the gamma number and calculate thermal-neutron capture cross-section.The measuring method of its thermal-neutron capture cross-section is identical with traditional neutron lifetime logging tool device method, and the shortcoming of this method is the impact that is subjected to the various gamma ray background counts of occurring in nature, and is not suitable for the relatively low stratum of salinity.
The utility model content
In order in the relatively low stratum of salinity, to realize the measurement to institute's geodetic layer water saturation and degree of porosity, measure in real time wellbore formation porosity and thermal neutron macroscopic capture cross-section parameter, eliminate the danger of radioactive source environmental pollution and operating personnel's personal injury, it is a kind of with boring controllable source neutron well logging instrument that the utility model provides.Described technical scheme is as follows:
On the one hand, provide a kind of with boring controllable source neutron well logging instrument, described instrument comprises: comprise drill collar, form a plurality of U-shaped grooves that radially arrange along the axially upper interval of described drill collar, described logger sealing is arranged in the described U-shaped groove, and it comprises:
Pulsed neutron source comprises the deuterium-tritium reaction neutron tube, and it launches high-energy neutron with pulse mode to institute's geodetic layer;
Probe unit comprises long spacing detector and short spaced detector, is used for receiving the thermal neutron that is scattered to well by the stratum;
Signal is processed and data analysis unit, is used for the stratum thermal neutron that described probe unit receives is counted and the data processing, obtains degree of porosity φ and the water saturation Sw of institute's geodetic layer;
Power module is used to above-mentioned each unit that power supply is provided.
Described signal is processed and the interior operation of data analysis unit has:
Main putting and the pulse amplitude analysis module, receive described probe unit before put output signal, be used for that output signal is amplified and pulse amplitude analysis to front putting.
Signal processing module receives described master and puts output signal with the pulse amplitude analysis module, and realizes the accumulation process of signal;
Data processor receives the cumulative signal of described signal processing module, and the cumulative signal that receives is carried out data process, and records degree of porosity φ and the water saturation Sw on stratum;
Data transmission module is connected with host computer with described data processor respectively, is used for that institute is surveyed parameter and transfers to host computer.
Described long spacing detector and short spaced detector are
3The He thermal-neutron detector.
On the other hand, provide a kind of with boring controllable source neutron well logging method, described method comprises:
The pulsed neutron source that starts on the drill collar is launched quantitative high-energy neutron with pulse mode to the stratum; Record respectively the thermal neutron number that after slowing down in the stratum, is scattered back well by long spacing detector and the short spaced detector that is arranged on the drill collar; Obtain thermal neutron macroscopic capture cross-section ∑ and the degree of porosity φ of institute's geodetic layer according to the measured thermal neutron number of two probes; Draw the water saturation Sw of institute's geodetic layer according to institute's calorimetric neutron macroscopic capture cross-section ∑ and degree of porosity φ.
Describedly obtain the thermal neutron macroscopic capture cross-section ∑ of institute's geodetic layer according to the measured thermal neutron number of two probes, it specifically comprises and is:
The thermal neutron number that detects according to the quantitative thermal neutron number that sends in any a period of time and at two probes draws respectively the stratum that two probes detect and captures the thermal neutron number; Calculate the macroscopic capture cross-section ∑ of institute's geodetic layer by thermal neutron macroscopic capture cross-section design formulas;
∑=105×10
4（lnN1-lnN2）/(t1-t2)
Wherein: N1, N2 capture the thermal neutron number in the stratum detected of corresponding two probes respectively;
T1, t2 are different time gates.
Describedly obtain the degree of porosity φ of institute's geodetic layer according to the measured thermal neutron number of two probes, it specifically comprises and is:
Draw respectively the counting rate of thermal neutron in the unit interval according to two probes institute calorimetric neutron number, try to achieve slowing-down length Le by the ratio of two probe gained counting rates; Try to achieve the degree of porosity of institute's geodetic layer according to the slowing-down length Le of thermal neutron;
Wherein, the formula of the acquisition of the slowing-down length Le of thermal neutron institute foundation is:
The formula of Calculation of Porosity institute foundation is:
Wherein:
r
1, r
2Be respectively the distance of long spacing detector range pulse neutron source;
D
tDiffusion coefficient for thermal neutron;
L
tDiffusion length for thermal neutron.
Described water saturation Sw by thermal neutron macroscopic capture cross-section and porosity calculation stratum, the formula of its foundation is:
Sw=（∑-∑ma(1-Φ-Vsh)-∑hΦ-∑shVsh）/Φ(∑w-∑h)
In the formula, ∑ ma is the macroscopic capture cross-section constant of skeleton;
∑ h is the macroscopic capture cross-section constant of hydrocarbon;
∑ sh is the macroscopic capture cross-section constant of shale;
∑ w is the macroscopic capture cross-section constant of formation water;
Vsh is shale bulk volume.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is:
A. comprise D-T deuterium-tritium reaction neutron tube in the pulsed neutron source that the utility model adopts, it sends high-energy neutron with pulse mode to institute's geodetic layer; The neutron ray energy of D-T neutron tube emission is 14Mev, and investigation depth is 25cm.According to D-D deuterium deuterium alpha reaction neutron tube and D-T deuterium-tritium reaction neutron tube reaction mechanism, at same size, D-D deuterium deuterium alpha reaction neutron tube neutron yield is than D-T deuterium-tritium reaction neutron tube neutron yield low 2/3rds under the same electrical parameter, increase investigation depth, reduce the radioactivity statistic fluctuation by the method that adopts long spacing detector, short spaced detector and D-T deuterium-tritium reaction neutron tube to improve neutron yield, improve certainty of measurement.
B. long spacing detector and the short spaced detector of the utility model employing are the 3He thermal-neutron detector, be used for to survey high-energy neutron and cross the thermal neutron of also not captured by the stratum after slowing down in the stratum, try to achieve the thermal neutron macroscopic capture cross-section on stratum and then calculate the water saturation on stratum; Its advantage is for traditional neutron life time log, because measurement is thermal neutron, there is free neutron hardly in nature, so not affected by background; The neutron attenuation spectrum that records all can be utilized, and at low salinity formation, because captive neutron number is few, counting rate is high, and statistical fluctuation is little, and more accurate measurement result can be provided.
C. logging instrument provided by the utility model adopts a probe unit can obtain degree of porosity and two groups of parameters before a large amount of mud liquid invaded formations occur of neutron Σ, and two groups of formation parameters are specially adapted to the evaluation to bad ground in the mutually reference of formation evaluation process.
D. with the ∑ parameter (stratum thermal-neutron capture cross-section) of boring controllable source neutron porosity-∑ logging instrument measurement, can help to analyze the fluid type in the nearly wellhole crack, stratum for same degree of porosity, water is larger with the macroscopic capture cross-section difference of oil, stronger for oil, water layer resolution capability, for the stratum is further analyzed, can ask profit macroscopic capture cross-section difference with the degree of porosity that the neutron porosity logging instrument is measured, accurately judge oil-water-layer.Particularly in the payzone of low-resistivity, the water saturation of utilizing the ∑ calculation of parameter to go out the stratum has very high practical value.Compare with dark resistivity, ∑ is measured relatively shallow, and therefore, the intrusion of mud liquid usually can reduce its measurement effect.So, concerning well logging during, can obtain more representative reservoir fluid in the ∑ parameter that occurs to measure before a large amount of mud liquid are invaded and describe.
E. with boring controllable source neutron porosity-∑ logging instrument to improving the well logging during system, play important effect.Simultaneously, this instrument can connect with boring the instrument any combination with other, is conducive to increase new measurement parameter, improves the efficient of measuring.Form as required the complete multi-parameter formation evaluation well logging during system of measurement parameter, have higher application value.
F. compare with Chinese patent literature CN102159970A, the utility model is realized water saturation and the porosity measurement on the relatively low stratum of salinity by adopting a kind of probe (3He proportional counter) to obtain simultaneously two groups of parameters of degree of porosity and thermal neutron macroscopic capture cross-section.Owing to only use a kind of probe to obtain simultaneously two groups of parameters, so that the Machine Design of instrument is more succinct, tool length shortens, and greatly reduces the underground construction risk; More meet in the world " integrated well logging " this theory, saved simultaneously instrument cost.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is provided by the utility model with boring controllable source neutron well logging method block diagram;
Fig. 2 is provided by the utility model with boring controllable source neutron well logging theory diagram;
Fig. 3 is that signal provided by the utility model is processed and the data analysis unit theory diagram;
Fig. 4 is the sectional view with boring the controllable source neutron logging instrument provided by the utility model;
Fig. 5 is the top view with boring the controllable source neutron logging instrument provided by the utility model.
Among the figure:
The 1-drill collar; 2-installs cover plate; The 3-bearing shell; The 4-holding screw; 5-mud via hole; 6-probe and signal are processed pipe nipple; 7-controllable neutron source packoff nipple; 8-controllable neutron source control pipe nipple; The 9-long spacing detector; The 10-short spaced detector.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail.
As shown in Figure 1, a kind of with boring controllable source neutron well logging method, wherein method comprises:
The pulsed neutron source that [S1] starts on the drill collar is launched quantitative high-energy neutron with pulse mode to the stratum
Adopt D-T deuterium-tritium reaction neutron tube, launch high-energy neutron in the mode of pulse to the stratum, thermal neutron wherein need to be predicted the number of its emission.
[S2] records respectively the thermal neutron number that is scattered back well after slowing down in the stratum by long spacing detector and the short spaced detector that is arranged on the drill collar
The long spacing detector here and short spaced detector are individually fixed on the drill collar, and long spacing detector range pulse neutron source wherein is far away, and short spaced detector range pulse neutron source is nearer.Detect respectively the subnumber of pining for that is scattered back well by long spacing detector and short spaced detector.
[S3] obtains thermal neutron macroscopic capture cross-section ∑ and the degree of porosity φ of institute's geodetic layer according to the measured thermal neutron number of two probes
Wherein obtain the thermal neutron macroscopic capture cross-section of institute's geodetic layer according to institute's calorimetric neutron number, its concrete grammar is:
The thermal neutron number that detects according to the quantitative thermal neutron number that sends in certain period and at two probes draws respectively the stratum that two probes detect and captures the thermal neutron number; Calculate the macroscopic capture cross-section ∑ of institute's geodetic layer by thermal neutron macroscopic capture cross-section design formulas;
∑=105×10
4（lnN1-lnN2）/(t1-t2)
Wherein: N1, N2 capture the thermal neutron number in the stratum detected of corresponding two probes respectively;
T1, t2 are different time gates.
According to the degree of porosity of the measured thermal neutron number acquisition institute geodetic layer of two probes, its concrete grammar is:
Try to achieve slowing-down length Le according to two probes institute calorimetric neutron count rate ratio; Try to achieve the degree of porosity of institute's geodetic layer according to the slowing-down length Le of thermal neutron;
Wherein, the formula of the acquisition of the slowing-down length Le of thermal neutron institute foundation is:
The formula of Calculation of Porosity institute foundation is:
Wherein:
r
1, r
2Be respectively the distance of long spacing detector range pulse neutron source;
D
tDiffusion coefficient for thermal neutron;
L
tDiffusion length for thermal neutron.
Obviously in the known situation of spacing r1 and r2, the thermal neutron count rate ratio is only relevant with the slowing-down length of fast neutron, can be in the hope of degree of porosity by it.
[S4] draws the water saturation Sw of institute's geodetic layer according to institute calorimetric neutron macroscopic capture cross-section and degree of porosity φ
Described thermal neutron macroscopic capture cross-section according to calorimetric number of neutrons acquisition institute of institute geodetic layer, its concrete grammar is:
Adopt neutron source to launch high-energy neutron with pulse mode to the stratum, use
3The He gas proportional detector is surveyed the thermal neutron after the slowing down.Neutron is not charged, is being filled with
3In the probe of He
3He is as the sensitive material of neutron and ionized gas.The slow neutron of incident enters probe and bump
3He produces tritium, proton and energy.Tritium, proton and other
3He atomic collision produces
3He and free electron.High pressure makes free electron to the cathodic metal silk accelerated motion at center, in the negative pulse of anode collection electronics, as the output of probe.By the time spectrum after the measurement neutron absorption, can determine the macroscopic capture cross-section of stratum and well according to following formula, and then find the solution some formation parameter.
By the water saturation Sw on thermal neutron macroscopic capture cross-section and porosity calculation stratum, the formula of its foundation is:
Sw=（∑-∑ma(1-Φ-Vsh)-∑hΦ-∑shVsh）/Φ(∑w-∑h)
In the formula, ∑ ma is the macroscopic capture cross-section constant of skeleton;
∑ h is the macroscopic capture cross-section constant of hydrocarbon;
∑ sh is the macroscopic capture cross-section constant of shale;
∑ w is the macroscopic capture cross-section constant of formation water;
Vsh is shale bulk volume.
As shown in Figure 4 and Figure 5, the utility model provides a kind ofly comprises drill collar with boring controllable source neutron well logging instrument, forms a plurality of U-shaped grooves that radially arrange along the axially upper interval of drill collar, by the installation cover plate that is arranged on the U-shaped groove logger is sealed in the U-shaped groove, it comprises:
Pulsed neutron source comprises the deuterium-tritium reaction neutron tube, and it sends high-energy neutron with pulse mode to institute's geodetic layer;
Probe unit comprises long spacing detector and short spaced detector, is used for receiving the thermal neutron that is scattered to well by the stratum;
Signal is processed and data analysis unit, is used for the stratum thermal neutron that described probe unit receives is counted and the data processing, obtains degree of porosity φ and the water saturation Sw of institute's geodetic layer;
Power module is used to above-mentioned each unit that power supply is provided.
Be provided with a plurality of pipe nipples at drill collar, comprise probe and signal processing pipe nipple, controllable neutron source packoff nipple and controllable neutron source control pipe nipple, in D-T deuterium-tritium reaction neutron tube be arranged in the controllable neutron source packoff nipple, and the control of titanium silk, anodic control and high voltage control are arranged in the controllable neutron source control pipe nipple, and long spacing detector and short spaced detector and signal are processed and data analysis unit all is arranged at probe and signal is processed in the pipe nipple.
With two of long space, short spaces
3After the He thermal-neutron detector detects thermal neutron with formation information, through preposition amplification, the twice signal is delivered to respectively signal processing circuit (degree of porosity parameter) and pulse amplitude analysis circuit (∑ parameter), and its key point is that the pulse amplitude analysis circuit is according to characteristic and the die-away time of thermal neutron; Because the pulse amplitude of nuclear radiation detector output and the energy of incoming particle are directly proportional, and therefore, measure the amplitude of these pulses, just can know the energy of incoming particle, can Accurate Analysis go out the incoming particle with formation information, right
3Power spectrum and the time spectrum of He thermal-neutron detector output signal are made Accurate Analysis.
As shown in Figure 3, signal process and data analysis unit in move and have:
Main putting and the pulse amplitude analysis module, receive described probe unit before put output signal, be used for that output signal is amplified and pulse amplitude analysis to front putting.
Signal processing module receives described master and puts output signal with the pulse amplitude analysis module, and realizes the accumulation process of signal;
Data processor receives the cumulative signal of described signal processing module, and the cumulative signal that receives is carried out data process, and records degree of porosity φ and the water saturation Sw on stratum;
Data transmission module is connected with host computer with described data processor respectively, is used for that institute is surveyed parameter and transfers to host computer.
Long spacing detector and short spaced detector are
3The He thermal-neutron detector.
Be illustrated in figure 2 as theory diagram.
Its workflow is: after the instrument power supply, the low-tension supply module provides operating voltage for each circuit unit power supply, and neutron tube is started working, to stratum emission 14Mev high-energy neutron, after the atomic nucleus generation series reaction of high-energy neutron and stratum element, will send into the thermal neutron of formation information
3The He proportional counter is close to
3The preamplifier of He pipe amplifies, being sent to main putting with the pulse amplitude analysis unit processes, be sent to again signal and process and the cpu data processor, obtain thermal neutron counting rate and the neutron time spectrum of long and short spacing, calculate degree of porosity and ∑ parameter through ground.
The utility model is increasing ∑ parameter (neutron-capture cross section) again with boring on the controllable source neutron porosity logging instrument basis, when measuring formation porosity, measure the neutron-capture cross section on stratum, realize the measurement of two groups of parameters before a large amount of mud liquid invaded formations occur with a hardware.With
3The He thermal-neutron detector is surveyed degree of porosity and the water saturation that the thermal neutron of also not captured by the stratum that becomes after high-energy neutron slows down through the stratum is tried to achieve the macroscopic capture cross-section on stratum and then calculated the stratum.
Thermal neutron produces till be absorbed from it and refers to statistic concept average time of experience, namely thermal neutron from its produce to the time that is absorbed experience have long, weak point, the thermal-neutron lifetime are here arranged is a kind of average.Thermal-neutron lifetime is relevant with the macroscopic capture cross-section of material, and namely the macroscopic capture cross-section of stratum media is larger, then the thermal-neutron lifetime shorter, the macroscopic capture cross-section of stratum media refers to the summation of the microscopic capture cross-section of each nucleic in the rock.
Adopt with the length of boring controllable source neutron porosity-∑ logging instrument probe employing antidetonation/short spaced detector
3The He thermal-neutron detector.Detector axis adopts the material of high atomic numbers that radioactive ray is shielded to, all sides, and the circuit framework of body interior and wiring board all are seismic design.
As shown in Figure 4, the utility model is in order better to obtain formation information, employing has a U-lag in the drill collar side, the apparatus subject mosaic mode is packed in the drill collar U-lag, this structure can make probe obtain good subsides borehole wall effect, and apparatus subject is connected reliably with drill collar, makes things convenient for the apparatus subject dismounting.
With boring controllable source neutron porosity-∑ logging instrument according to the characteristic of thermal neutron and designing corresponding accelerator for neutron production outburst mode die-away time, because the interaction on neutron and stratum, it is the effect between the atomic nucleus of neutron and stratum element, after the high energy fast neutron of the 14Mev that pulsed neutron source is launched is injected the stratum, within the initial extremely short time, lose a large amount of energy with the atomic nucleus generation inelastic scattering of each element in the stratum, discharge simultaneously the inelastic scattering gamma ray with nuclear radiation characteristic energy.In general, in several microseconds behind the pulsed neutron source given-ioff neutron, the fast neutron of 14Mev is thermal neutron by slowing down in the stratum of wellbore.According to the effect between above-mentioned pulsed neutron and the stratum, the utility model is by the anodic pulse circuit of neutron tube, having designed a short period neutron burst sequential cycle is 1ms, wherein neutron burst 80 μ s rest 920 μ s and measure the time spectrum counting in 100 roads, per pass 10 μ s, and the power spectrum and the time spectrum that adopt the high programmable gate array of degree of integration and microprocessor optimal design to be applicable to pulsed neutron-neutron instrument gather sequential, Acquisition Circuit and acquisition software.
Select high nitrogen chromium manganese stainless steel W1813N material as the rapidoprint of " drill collar " among Fig. 5.The rigidity characteristics that the nonmagnetic energy that utilizes and material itself have is according to this part of structure fabrication of the utility model it " drill collar ".
What the utility model provided adopts beryllium-bronze with boring controllable source neutron logging instrument circuit pack bearing shell, and this kind material has good plasticity after solid solution and timeliness processing, can carry out cold deformation.But after carrying out Ageing Treatment, but have fabulous " elastic performance ", hardness also is improved, and intensity can reach 1250～1500MPa.Also have simultaneously the characteristics such as high conductivity, nonmagnetic, wear-resisting, endurance, low temperature resistant, corrosion-resistant and elastic hysteresis be little.
Above-mentioned the utility model embodiment sequence number does not represent the quality of embodiment just to description.
The all or part of step that one of ordinary skill in the art will appreciate that realization above-described embodiment can be finished by hardware, also can come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only storage, disk or CD etc.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (3)
1. one kind with boring controllable source neutron well logging instrument, comprises drill collar, it is characterized in that, forms a plurality of U-shaped grooves that radially arrange along the axially upper interval of described drill collar, and described logger sealing is arranged in the described U-shaped groove, and it comprises:
Pulsed neutron source comprises the deuterium-tritium reaction neutron tube, and it launches high-energy neutron with pulse mode to institute's geodetic layer;
Probe unit comprises long spacing detector and short spaced detector, is used for receiving the thermal neutron that is scattered to well by the stratum;
Signal is processed and data analysis unit, is used for the stratum thermal neutron that described probe unit receives is counted and the data processing, obtains degree of porosity φ and the water saturation Sw of institute's geodetic layer;
Power module is used to above-mentioned each unit that power supply is provided.
2. according to claim 1ly it is characterized in that with boring controllable source neutron well logging instrument,
Described signal is processed and the interior operation of data analysis unit has:
Main putting and the pulse amplitude analysis module, receive described probe unit before put output signal, be used for that output signal is amplified and pulse amplitude analysis to front putting.
Signal processing module receives described master and puts output signal with the pulse amplitude analysis module, and realizes the accumulation process of signal;
Data processor receives the cumulative signal of described signal processing module, and the cumulative signal that receives is carried out data process, and records degree of porosity φ and the water saturation Sw on stratum;
Data transmission module is connected with host computer with described data processor respectively, is used for that institute is surveyed parameter and transfers to host computer.
3. according to claim 1 and 2ly it is characterized in that with boring controllable source neutron well logging instrument,
Described long spacing detector and short spaced detector are
3The He thermal-neutron detector.
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