CN106761722A - Using the high-resolution density logging instrument of position sensitive detector and logging method - Google Patents
Using the high-resolution density logging instrument of position sensitive detector and logging method Download PDFInfo
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- CN106761722A CN106761722A CN201611073455.1A CN201611073455A CN106761722A CN 106761722 A CN106761722 A CN 106761722A CN 201611073455 A CN201611073455 A CN 201611073455A CN 106761722 A CN106761722 A CN 106761722A
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- Prior art keywords
- detector
- sensitive detector
- gamma ray
- logging instrument
- position sensitive
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention provides a kind of high-resolution density logging device of use position sensitive detector.Detector in current density logging device is replaced with location-sensitive detector by the device.Based on this improvement, the present invention can measure the Flux Distribution for obtaining gamma ray along well direction.By analyzing its measurement result, the present invention can provide the density resolution curve of higher precision, be that the division of reservoir thickness and the measurement of thin reservoir provide important means.
Description
Technical field
The present invention relates to a kind of high-resolution density logging device of use position sensitive detector, belong to oil well logging skill
Art field.
Background technology
In oil well logging field, density log is measurement stratum density, the indispensable measuring method that judges formation lithology
One of.
Density log is begun and 1954, and first densilog instrument is by one piece of gamma radiation source and a gamma ray
Detector is constituted, and it determines the density on stratum by measuring attenuation degree of gamma ray when through stratum.But in reality
Found in the well logging of border, the instrument is highly susceptible to well（Mud cake or the borehole wall are irregular）Influence.In order to eliminate well
Influence to measurement result, 1964, Performance of Dual-detector Density Tool was suggested, and it is also referred to as compensation density logger,
The instrument is measured using nearly remote two gamma detectors, and the ratio that is counted by nearly far detector judges stratum
Density.Device after improvement effectively reduces the influence of borehole condition, and compensation density logger is still density up to now
The most frequently used device during measurement.
At present, most domestic oil field belongs to continental deposit, and thin interbed is more in such oil field, and contains in many thin interbeds
Abundant petroleum resources.Detection to such thin interbed is, it is necessary to high-resolution logger, but current double detector density is surveyed
The longitudinal resolution distance of well instrument can not reach the purpose for differentiating thin interbed in 0.4m or so.To improve the longitudinal direction point of instrument
Ability is distinguished, Logging Company successively proposes Three detector density logging instrument including Schlumberger etc., i.e., close in traditional double detector
One piece of " back scattering " detector is added on the basis of degree logger, by three treatment of detector measurement data, can be with
Obtain of a relatively high longitudinal frame.
The developing history for summarizing density logging instrument can be seen that：The quantity that detector is used is more, the stratum letter of acquisition
Breath is more, and the certainty of measurement and vertical resolution of instrument are also higher.Inspired by this Changing Pattern, the present invention uses position
Put sensitive-type detector and substitute traditional single point detector.Position sensitive detector can not only be recorded and incided in detector
The number and energy of gamma ray, and position when gamma ray incides detector can be recorded.Compared to double detector or
Three detector density logging instrument only gathers the gamma flux of two or three points, and the invention can collect whole detection
The continuous Flux Distribution of gamma ray at device position, thus maximum possible the metrical information for obtaining stratum.By to measurement
The Flux Distribution for obtaining is processed, and can obtain more accurate density measurements and Geng Gao vertical resolutions.
The content of the invention
Goal of the invention：To meet measurement demand of the oil field to thin interbed, location-sensitive is used the invention provides one kind
The high-resolution penetron of detector, it possesses longitudinal frame higher, using the teaching of the invention it is possible to provide more accurate density measure
As a result.
Technical scheme：
Using the high-resolution density logging instrument of position sensitive detector, it is characterised in that：
Including telescoping ram, probe and hole diameter leg；
The probe and hole diameter leg are arranged on the both sides of the telescoping ram；
Location-sensitive detector and source compartment are provided with the probe.
The high-resolution density logging instrument of described use position sensitive detector, preferably：The source compartment is gal
Ma Yuan or neutron source, its species are controllable source or chemical source.
The high-resolution density logging instrument of described use position sensitive detector, preferably：The location-sensitive is visited
Surveying device includes that gamma ray measures the electrooptical device at sensitive material and gamma ray measurement sensitive material two ends.
The high-resolution density logging instrument of described use position sensitive detector, preferably：The gamma ray measurement
Sensitive material is scintillator crystals or sodium iodide crystal.
The high-resolution density logging instrument of described use position sensitive detector, preferably：The gamma ray measurement
The length of sensitive material is at least 20cm；It is shaped as elongated solid geometry body, specially cylinder or cuboid.
The high-resolution density logging instrument of described use position sensitive detector, preferably：The location-sensitive is visited
Surveying device also includes signal processing circuit；The signal processing circuit includes：
Described electrooptical device, is connected with preamplifier, main amplifier and signal contrast circuit in turn；
High voltage power supply is also associated with the electrooptical device.
A kind of logging method using the high-resolution density logging instrument for using position sensitive detector as mentioned, it is special
Levy and be：
The measuring method is comprised the following steps：
1）After gamma ray enters contains the detector to gamma ray sensitive material, interacted with the sensitive material
Produce optical signal；
2）Gal is determined by the time difference or amplitude difference of the electric signal of the electrooptical device generation at detector crystal two ends
Incoming position information of the horse ray on detector long axis direction；
3）The statistics of above-mentioned steps is carried out for interval at a certain distance, the flux of gamma ray is obtained along the distribution in well direction, it is right
Distributed data treatment calculates density value.
Described logging method, preferably：In the step 3）In, at least 2 distance segments are chosen, in respective distance section
The gamma flux for measuring is integrated or sues for peace.
Described logging method, preferably：When distant distance segment is counted much smaller than other distance segments, can be again
The distance segment close to radioactive source is selected to be calculated, to reduce calculation error.
Advantage and effect：Compared to the gamma flux that existing measuring instrument only gathers two or three points, the present invention
Can collect the continuous Flux Distribution of gamma ray at whole detector position, thus maximum possible the measurement for obtaining stratum
Information.Processed by the Flux Distribution that measurement is obtained, more accurate density measurements and more Gao Zong can be obtained
To resolution capability.
Brief description of the drawings：
Fig. 1 is using the high-resolution density logging instrument schematic diagram of location-sensitive detector.
Fig. 2 is the electrical block diagram of position sensitive detector.
Marked in figure：1 telescoping ram；2 probes；3 position sensitive detectors；4 source compartments；5 hole diameter legs.
Specific embodiment：
Technological thought of the invention is：
By the summary of the developing history to density logging instrument, it can be seen that the quantity that detector is used is more, the ground of acquisition
Layer information is more, and the certainty of measurement and vertical resolution of instrument are also higher.
Inspired by this Changing Pattern, the present invention substitutes traditional detector using location-sensitive detector.Position
Sensitive detector can not only record the number and energy of the gamma ray incided in detector, and can record gamma ray
Incide position during detector.Two or three points are only gathered compared to double detector or Three detector density logging instrument
Gamma flux, the invention can collect the continuous Flux Distribution of gamma ray at whole detector position, therefore maximum
The possible metrical information for obtaining stratum.Processed by the Flux Distribution that measurement is obtained, can obtain more accurate
Density measurements and Geng Gao vertical resolutions.
By the guidance of above technological thought, concrete technical scheme of the invention is：
The present apparatus includes electronic control circuit, telescoping ram, probe, hole diameter leg.Wherein probe is measured using elongated gamma ray
Crystal（Length is at least 20 centimetres）, photomultiplier is installed at the two ends of crystal, reach crystal by measuring gamma rays
The time difference of signal is produced behind two ends（Or amplitude difference）To determine the incident position of gamma rays and be recorded.Per complete
Into after a measurement for sampled point, will measure to positional information is at a certain distance interval（Such as 0.5 centimetre）United
Meter, can obtain the flux of gamma rays along the distribution in well direction.By the treatment to Flux Distribution data, it is calculated
Density value at the point.
As shown in Fig. 1, the present invention is main by telescoping ram 1, probe 2, hole diameter leg 5 and correlation electronics control electricity
Road constitutes.Probe 2 and hole diameter leg 5 are separately mounted to telescoping ram both sides, and location-sensitive detection is provided with probe 2
Device 3 and source compartment 4.
Explorer portion is core of the invention, its use a location-sensitive detector instead of double detector or
The common gamma ray detectors of multiple in Three detector density logging instrument.As shown in Fig. 2, when gamma rays enter
After being mapped to detector crystal, it can produce optical signal with the material generation interaction in gamma-sensitive materials such as crystal.Light
The time difference for reaching detector two ends is the position produced by optical signal（That is the incident position of gamma rays）Determine, because
This can obtain the incident position of gamma rays by the time difference or amplitude difference that contrast the electric signal that detector two ends produce
Confidence ceases.By the treatment to gamma ray position information, a certain measurement point gamma rays can be obtained along well
The Flux Distribution in direction.
It is its flexibility when measurement data is processed using the detector biggest advantage of location-sensitive.In double detections
In device or Three detector density logging instrument, the gamma rays that they can only provide at or 3 points at certain 2 points are counted, and this
The distance between a little detectors and radioactive source have a great impact to the accuracy of measured value.For example, being surveyed in double detector density
In well instrument, far detector can neither too closely can not be too remote apart from radioactive source.Away from too far away its counting can be caused very few, counted
Error is big；Distance is too near, then cause it not distinguished significantly with the counting of nearly detector.Under normal circumstances, nearly far detector
Distance be set to a value being adapted under most of strata conditions, but when the excessive or too small stratum of density is run into, its
Measurement result may result in larger error.But the present invention can effectively avoid this error, because using position sensitive
The detector measurement of type obtain be gamma rays Flux Distribution.When three typical cases when data processing is carried out, can be chosen
Distance segment, to respective distance section in gamma flux be integrated（Summation）, then according to the data processing of three detectors
Method is processed；When the density very stratum of big or very little is run into, the position of these three distance segments can be adjusted.
If finding the counting very little in that distance segment farther out when for example calculating（During comprising larger statistical error）, can be again
The distance segment close to radioactive source is selected to be calculated, the value error for so obtaining can be relatively small.In addition can also attempt
Four even more distance segments are chosen to be calculated.Certain data processing method of the invention is not only limited and this, it may be considered that
The method for introducing the machine learning such as neutral net is processed data.
The technical scheme provided using this specific embodiment, it is possible to increase the accuracy of density measure and its longitudinal resolution
Ability, this will provide important means for the measurement of thin interbed.
Claims (9)
1. using the high-resolution density logging instrument of position sensitive detector, it is characterised in that：
Including telescoping ram（1）, probe（2）With hole diameter leg（5）；
The probe（2）With hole diameter leg（5）Installed in the telescoping ram（1）Both sides；
The probe（2）On be provided with location-sensitive detector（3）And source compartment（4）.
2. the high-resolution density logging instrument of use position sensitive detector according to claim 1, it is characterised in that：Institute
State source compartment（4）It is gamma ray source or neutron source, its species is controllable source or chemical source.
3. the high-resolution density logging instrument of use position sensitive detector according to claim 1, it is characterised in that：Institute
State location-sensitive detector（3）Sensitive material is measured including gamma ray and the gamma ray measures sensitive material two ends
Electrooptical device.
4. the high-resolution density logging instrument of use position sensitive detector according to claim 3, it is characterised in that：Institute
It is scintillator crystals or sodium iodide crystal to state gamma ray measurement sensitive material.
5. the high-resolution density logging instrument of use position sensitive detector according to claim 3, it is characterised in that：Institute
State the length at least 20cm that gamma ray measures sensitive material；It is shaped as elongated solid geometry body, specially cylinder
Or cuboid.
6. the high-resolution density logging instrument of use position sensitive detector according to claim 3, it is characterised in that：Institute
State location-sensitive detector（3）Also include signal processing circuit；The signal processing circuit includes：
Described electrooptical device, is connected with preamplifier, main amplifier and signal contrast circuit in turn；
High voltage power supply is also associated with the electrooptical device.
7. a kind of use uses the well logging side of the high-resolution density logging instrument of position sensitive detector as claimed in claim 1
Method, it is characterised in that：
The measuring method is comprised the following steps：
1）After gamma ray enters contains the detector to gamma ray sensitive material, interacted with the sensitive material
Produce optical signal；
2）Gal is determined by the time difference or amplitude difference of the electric signal of the electrooptical device generation at detector crystal two ends
Incoming position information of the horse ray on detector long axis direction；
3）The statistics of above-mentioned steps is carried out for interval at a certain distance, the flux of gamma ray is obtained along the distribution in well direction, it is right
Distributed data treatment calculates density value.
8. logging method according to claim 7, it is characterised in that：In the step 3）In, choose at least 2 distances
Section, the gamma flux to being measured in respective distance section is integrated or sues for peace.
9. logging method according to claim 7, it is characterised in that：Other are much smaller than when distant distance segment is counted
During distance segment, the distance segment close to radioactive source can be reselected and calculated, to reduce calculation error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073455.1A CN106761722A (en) | 2016-11-29 | 2016-11-29 | Using the high-resolution density logging instrument of position sensitive detector and logging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073455.1A CN106761722A (en) | 2016-11-29 | 2016-11-29 | Using the high-resolution density logging instrument of position sensitive detector and logging method |
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| Publication Number | Publication Date |
|---|---|
| CN106761722A true CN106761722A (en) | 2017-05-31 |
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| CN201611073455.1A Pending CN106761722A (en) | 2016-11-29 | 2016-11-29 | Using the high-resolution density logging instrument of position sensitive detector and logging method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638158A (en) * | 1984-01-18 | 1987-01-20 | Halliburton Company | Gamma ray measurement of earth formation properties using a position sensitive scintillation detector |
| CN1719000A (en) * | 2005-07-07 | 2006-01-11 | 中国石化集团胜利石油管理局测井公司 | Lithology density well logging instrument |
| CN201045295Y (en) * | 2007-06-07 | 2008-04-09 | 山东胜利伟业石油工程技术服务有限公司 | High-temperature densilog instrument |
| US20110272570A1 (en) * | 2010-05-04 | 2011-11-10 | Smith International, Inc. | Method and Apparatus for Neutron Logging Using a Position Sensitive Neutron Detector |
| CN202117654U (en) * | 2011-06-01 | 2012-01-18 | 大庆石油管理局 | High-resolution density logging device |
-
2016
- 2016-11-29 CN CN201611073455.1A patent/CN106761722A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638158A (en) * | 1984-01-18 | 1987-01-20 | Halliburton Company | Gamma ray measurement of earth formation properties using a position sensitive scintillation detector |
| CN1719000A (en) * | 2005-07-07 | 2006-01-11 | 中国石化集团胜利石油管理局测井公司 | Lithology density well logging instrument |
| CN201045295Y (en) * | 2007-06-07 | 2008-04-09 | 山东胜利伟业石油工程技术服务有限公司 | High-temperature densilog instrument |
| US20110272570A1 (en) * | 2010-05-04 | 2011-11-10 | Smith International, Inc. | Method and Apparatus for Neutron Logging Using a Position Sensitive Neutron Detector |
| CN202117654U (en) * | 2011-06-01 | 2012-01-18 | 大庆石油管理局 | High-resolution density logging device |
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Application publication date: 20170531 |