CN102518429B - Device and method for calibrating orientational double-gamma instrument balance - Google Patents
Device and method for calibrating orientational double-gamma instrument balance Download PDFInfo
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- CN102518429B CN102518429B CN201110394212.9A CN201110394212A CN102518429B CN 102518429 B CN102518429 B CN 102518429B CN 201110394212 A CN201110394212 A CN 201110394212A CN 102518429 B CN102518429 B CN 102518429B
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Abstract
The invention relates to a device and a method for calibrating orientational double-gamma instrument balance and provides a rear shielding case and a calibrating tank capable of being detached in half. An instrument to be calibrated is placed in a shielding space formed by connecting the rear shielding case and a sub-tank body, and a first sensor and a second sensor which are arranged in a 180-degree opposite mode in the instrument are respectively close to one side of the sub-tank body and measured under the radioactive action of a homogenous calibration material. Therefore, sensitivity normalization of the instrument is calibrated, the instrument can be further placed in an another space formed by connecting two sub-tank bodies on a complete calibrating tank body so as to eliminate radioactivity influence of stratum on one side of the instrument to measurement of the sensors on the other side of the instrument, and conventional accurate position indicator (API) calibration can be performed. Thus, the whole performance of the calibrated instrument and response of a single sensor can both be unified, and total measurement results or some component values obtained by the instrument has general comparability.
Description
Technical field
The present invention relates to a kind of caliberating device and scaling method thereof of logger, particularly a kind of device and method with boring the two gamma instrument balances demarcation of directionality.
Background technology
Dissimilar stratum, has different naturally radioactive intensity.The single probe of tradition gamma instrument, only provides the instrument average of radioactive intensity around.The two gamma instruments of directionality can be distinguished the difference of instrument both sides radioactive intensity, for well logging during construction finds that stratigraphic boundary provides a kind of effective means in time.
Shown in Fig. 1 with boring the two gamma instruments 300 of directionality, be connected with drill collar inwall 400 by instrument outer wall 350; On the position that this outer wall 350 is interior relative 180 °, be respectively designed with a sensor that carries out gamma detection, on hydrophthalmia 340 positions between these two sensors, be also designed with directionality screen layer 330.According to the setting position of diagram screen layer 330, make the ideally natural radioactivity on 310 responsive instrument 300 stratum, left side of first sensor, the natural radioactivity on the responsive instrument of the second 320 of sensors 300 stratum, right side.Therefore, not only can identify the gross activity Strength Changes on stratum with the two gamma instruments of brill directionality, can also further the spatial relationship on the data that record and stratum be mapped.
In unlimited evenly stratum, if the performance of first, second sensor is just the same, their measured value should be identical so.But even if working condition is identical with processing technology, the sensitive of two sensors being finally assemblied on instrument can be not in full accord yet.Therefore under physical condition, due to the restriction of the conditions such as instrument size, the first sensor in instrument left side likely detects the ray from right side, and vice versa.So need to proofread and correct, to eliminate the impact of instrument constant error on overall measurement result.
Therefore, the two gamma instruments of directionality need two special corrections and conventional a correction.Special correction is: one, by the sensitivity normalization of two sensors; Two, be to proofread and correct the impact of another side stratum radioactivity on this side stratum measurement result.Conventional correction is the desired API scale of common GR instrument.
Summary of the invention
The object of the invention is the device and method of demarcating by designing the two gamma instrument balances of a kind of directionality, not only can carry out conventional API to the two gamma instruments of directionality proofreaies and correct, can also carry out sensitivity normalization to two sensors in instrument, and the impact of the radioactivity of eliminating a side stratum on sensor measurement in opposite side stratum; Thereby the overall performance of instrument and the response of single-sensor can both be unified after demarcation, overall measurement result or certain component value that instrument is drawn, all possess general comparativity.
In order to achieve the above object, one of technical scheme of the present invention is to provide the device that the two gamma instrument balances of a kind of directionality are demarcated, first sensor and the second sensor to relative 180 ° of layouts in the two gamma instruments of described directionality are proofreaied and correct, and on the hydrophthalmia position between described two sensors, correspondence is provided with directionality screen layer; The device that described balance is demarcated, comprises:
A tank prover, it comprises two independently sub-tank bodies; Described two sub-tank bodies are connected and form the main body of this tank prover; The inner side of each described sub-tank body is provided with opening, described two sub-tank bodies is connected in the time that its opening is relative, thereby forms a shielding space in described tank prover main body;
In described tank prover main body after connection, further comprise:
There is radioactive homogeneous in the periphery of described shielding space around the circle arranging and demarcate material, and there is certain thickness radome in the periphery of described homogeneous demarcation material around the circle arranging; That is, on each described sub-tank body by inner side to outside, be formed with the described opening that is equivalent to half shielding space area, the described homogeneous of half-turn is demarcated the described radome of material and half-turn;
The device that described balance is demarcated, also comprises:
One has certain thickness rear radome, and it is provided with the opening that is equivalent to shielding space area described in half; By in described rear radome and tank prover described in any one sub-tank body be connected, make the opening of described rear radome relative with the opening of described sub-tank body, thereby form another shielding space;
Two described shielding spaces and the outer wall of instrument to be corrected match, at timing signal, described instrument correspondence is placed in the shielding space being connected to form by described two sub-tank bodies in a described tank prover main body, or is placed on by described rear radome and shielding space that described in one of them, sub-tank body is connected to form.
The radome of described tank prover and rear radome are made up of lead;
The consistency of thickness of described radome and rear radome; For the requirement of described thickness, should meet the local radioactive background radiation of the device outside that described balance is demarcated, decay to described homogeneous and demarcate below one of percentage of material radioactive intensity.
It is the high radioactivity rock dust of uniform filling in the sub-tank body of described tank prover that described homogeneous is demarcated material.
In a preferred embodiment, described tank prover main body is a cylinder, and described two sub-tank bodies are two symmetrical semicircular cylinders; Opening by described two sub-tank bodies coordinates the shielding space forming, and is the circular space that is positioned at this tank prover main center.
Described rear radome is provided with a semicircle segmental arc, and a side of described semicircle segmental arc is formed as semicircular opening, the described opening formation shielding space that matches with the opening of sub-tank body described in one of them;
Described semicircle segmental arc two ends are also provided with two straightways, described two straightways layout that stretches out along the two ends of diameter place straight line in semicircle segmental arc; Described rear radome is by described two straightways, with the corresponding connection in radome two ends of sub-tank body described in one of them.
When instrument to be corrected is placed in by described rear radome and shielding space that described in one of them, sub-tank body is connected to form, make the line of straightway in the line of two sensors in this instrument and described rear radome perpendicular;
And, make described first sensor be in the side near sub-tank body, the second sensor is in the side near rear radome; Or, make described the second sensor be in the side near sub-tank body, first sensor is in the side near rear radome.
Another technical scheme of the present invention is to provide the method that the two gamma instrument balances of a kind of directionality are demarcated, and the method that uses the device of said structure to demarcate the two gamma instruments of directionality, comprises:
Instrument to be corrected is placed on by described rear radome and shielding space that described in one of them, sub-tank body is connected to form, make first sensor and second sensor of relative 180 ° of layouts in instrument, in the radioactivity effect of demarcating material near a side of described sub-tank body the homogeneous of wherein being filled, measure respectively, thereby instrument is carried out to the method for sensitivity normalization; Also comprise,
Further described instrument is placed in another shielding space being connected to form by described two sub-tank bodies in a complete tank prover main body, the method of the impact of the radioactivity of eliminating instrument one side stratum on sensor measurement in opposite side, and the method for instrument being carried out to API correction.
Described sensitivity method for normalizing, specifically comprises following steps:
Step 1.1, instrument to be corrected is placed on by described rear radome and shielding space that described in one of them, sub-tank body is connected to form;
Step 1.2, make first sensor in described instrument be in the side near described sub-tank body, and be subject to described homogeneous and demarcate the radioactivity effect of material, and make the second sensor be in the side near rear radome; Now, measure the stable original count rate C of first sensor and the second sensor
11and C
12;
Step 1.3, instrument is rotated to 180 °, make described the second sensor be in the side near sub-tank body, and be subject to described homogeneous and demarcate the radioactivity effect of material, and make described first sensor be in the side near rear radome; Now, again measure the stable original count rate C of first sensor and the second sensor
21and C
22;
Step 1.4, the normalization coefficient of first sensor is made as to 1, calculates the count rate ratio of first sensor and the second sensor, as the normalization coefficient K of the second sensor; Formula is as follows:
K = C
11/ C
22 ①
According to COEFFICIENT K, instrument is carried out to sensitivity normalization.
The method of the another side formation influence of described elimination, comprises:
Step 2.1, to step 2.3, is placed in instrument to be corrected shielding space the upset of described rear radome and sub-tank body cooperation formation,, is recorded separately and stablizes original count rate C respectively in upset front and back by first sensor, the second sensor
11, C
12and C
21, C
22;
Described method further comprises:
Step 2.4, according to described original count rate C
11, C
12and C
21, C
22, obtain the another side stratum contribution rate b of first sensor by following formula, and the contribution rate a on the another side stratum of the second sensor, formula is as follows:
C
12 = a×C
11 ，a = C
12/C
11 ②
C
21 = b×C
22 ，b = C
21/C
22 ③
Step 2.5, described instrument is placed in to tank prover main body is coordinated in the shielding space forming by described two sub-tank bodies, record the actual count rate C of these two sensors
31with C
32;
If first sensor, the second sensor source are n and m from the counting rate of homonymy stratum contribution; According to another side stratum contribution rate a and the b of described two sensors, by following formula, solve and obtain n, m;
C
31 = n+b×m ④
C
32 = a×n+m ⑤
m =（C
32-a×C
31）/（1-a×b） ⑥
n =（C
31-b×C
32）/（1-a×b） ⑦
The described counting rate that is derived from homonymy stratum contribution is n, m, is exactly to have eliminated first, second sensor survey data separately after another side formation influence.
The method that described API proofreaies and correct, comprises:
The radioactive intensity that records the homogeneous demarcation material of filling in described tank prover is R;
Take the normalization coefficient of first sensor as benchmark, the normalization coefficient K of the second sensor calculating; And first, second sensor source calculating is n, m from the counting rate of homonymy stratum contribution;
According to parameters R, K, m, n, convert and obtain the API correction coefficient C on first, second sensor homonymy stratum
a1and C
a2:
C
A1 = R/n ⑧
C
A2 = R×K /m ⑨
When actual use, any natural gamma intensity level of the tested stratum of side take API as unit, the counting rate that is this side senser is multiplied by corresponding API correction coefficient; The average radioactive intensity on tested stratum is the average of these two sensor component values.
Compared with prior art, the device and method that the two gamma instrument balances of directionality of the present invention are demarcated, its advantage is: the tank prover that the invention provides radome after and and may be split into two halves; A complete tank prover main body of corresponding use, or the assembly that rear radome and any one the sub-tank body splitting out are connected to form is as caliberating device, not only can be for carrying out conventional API correction with boring the two gamma instruments of directionality, can also carry out sensitivity normalization to the sensor of both sides in instrument, and eliminate the impact of side stratum radioactivity on opposite side sensor measurement; Thereby the overall performance of instrument and the response of single-sensor can both be unified after demarcating, overall measurement result or certain component value that instrument is drawn, all possess general comparativity.
Accompanying drawing explanation
Fig. 1 is with the structural representation that bores the two gamma instruments of directionality;
Fig. 2 is the structural representation of demarcating can body in the two gamma instrument balance caliberating devices of directionality of the present invention;
Fig. 3 is the structural representation of rear radome in the two gamma instrument balance caliberating devices of directionality of the present invention;
Fig. 4, Fig. 5 are respectively the schematic diagrames that in the present invention, half tank prover and rear shield combination is normalized to correction to two sensors in the two gamma instruments of directionality;
Fig. 6 is the schematic diagram that uses whole tank prover to carry out API correction to the two gamma instruments of directionality in the present invention.
The specific embodiment
Below in conjunction with accompanying drawing explanation the specific embodiment of the present invention.
The device and method that balance of the present invention is demarcated, for proofreading and correct the two gamma instruments 300 of the directionality shown in Fig. 1.In the outer wall 350 of the two gamma instruments 300 of this directionality, on the position of relative 180 °, be designed with separately a sensor (being also called below first sensor 310 and the second sensor 320) that carries out gamma detection, the corresponding screen layer 330 that is provided with directionality on hydrophthalmia 340 positions between these two sensors.
Coordinate referring to shown in Fig. 2, Fig. 3, balance caliberating device of the present invention comprises a tank prover (Fig. 2), and radome 102(Fig. 3 after).Tank prover main body 101 is cylindrical shape, and it can split into two symmetrical semicircular cylinders; Each semi-cylindrical shaped becomes an independently sub-tank body 10.
As shown in Figure 2, leave a shielding space 31 in the center of a complete tank prover main body 101, this shielding space 31 matches with the geomery of instrument 300 outer walls 350 to be corrected, is a circular space that radius is S1.The periphery of shielding space 31 is surrounded with a circle homogeneous and demarcates material 12; It is high radioactivity rock dusts of uniform filling that described homogeneous is demarcated material 12, and it is from the outward flange of shielding space 31, along being radially uniformly distributed in certain distance S2 of tank prover main body 101.
A described circle homogeneous is demarcated material 12 peripheries, is also further surrounded with the radome 11 of the plumbous system of a circle; For the radial thickness S3 of this radome 11, require it by local radioactive background radiation, to decay to below one of percentage of rock dust material radioactive intensity.Therefore, two described directionality gamma instruments 300 can be placed in to the interior (see figure 6) of this shielding space 31, carry out conventional API and proofread and correct.Every the sub-tank body 10(that tank prover main body 101 is split to formation is shown in Fig. 4 or Fig. 5) on from inside to outside, be formed with the opening 13 that is equivalent to half shielding space area, and half-turn homogeneous is demarcated material 12 and half-turn radome 11.
Coordinate referring to shown in Fig. 3, Fig. 4, Fig. 5, described rear radome 102 entirety are workpiece of similar " Ω " shape, shown in Fig. 3, have been equivalent to by described class " Ω " shape workpiece to right rotation 90 °.That is to say, described rear radome 102 is provided with a semicircle segmental arc 21; Described semicircle segmental arc 21 two ends are also formed with two straightways 22, these two straightways 22 specifically stretch out along the two ends of diameter L place straight line in semicircle segmental arc 21 layout (straight line at this diameter L place be one supposition line, on workpiece, reality does not exist).
The semicircle segmental arc 21 of described rear radome 102 and straightway 22 are all that used thickness is that the lead layer of S3 is made, and this thickness is consistent with the radial thickness of the radome 11 of above-mentioned tank prover.The inner side of described semicircle segmental arc 21 is formed with the semicircle opening 23 that radius is S1, and the area of this opening 23 is identical with the half area of circular shielding space 31 in above-mentioned tank prover, namely identical with opening 13 areas of above-mentioned sub-tank body 10.Can be by relative the opening of sub-to the opening of rear radome 102 23 and one of them tank body 10 13, and make straightway 22 one end (straightway 22 other ends connect arc section 21) of remainder separately on rear radome 102, with the corresponding connection in two ends of half-turn radome 11 on sub-tank body 10, thereby form another shielding space 32 in the position of two openings 13,23.Known according to above describing, the geomery of this shielding space 32 is also consistent with the outer wall 350 of instrument 300 to be corrected, therefore, two described directionality gamma instruments 300 are placed in this shielding space 32 (seeing Fig. 4 or Fig. 5), two of this instrument 300 sensors are carried out to sensitivity normalization.And the radioactivity that will eliminate a side stratum is during on the affecting of sensor in another side stratum, also needs in addition instrument to be corrected 300 to be placed in the caliberating device shown in Fig. 6.
The caliberating device that uses said structure in the present invention is below described, the method that the two gamma instruments 300 of directionality are demarcated.Comprise:
1, the method for sensitivity normalization;
Step 1.1, any one sub-tank body 10 in tank prover is connected with rear radome 102, shielding space 32(Fig. 4 that the outer wall 350 that forms geomeries and instrument to be corrected 300 at its relative opening 13,23 places matches).
Step 1.2, instrument to be corrected 300 is placed in described shielding space 32, make the line of two sensors 310,320 in this instrument 300 and the line of the interior straightway 22 of rear radome 102 perpendicular, make first sensor 310 be in the side (being left side in Fig. 4) near sub-tank body 10 simultaneously, and thereby be subject to the interior homogeneous of sub-tank body 10 and demarcate the radioactivity effect of material 12, and make the second sensor 320 be in the side (being right side in Fig. 4) near rear radome 102.
Now, measure the stable original count rate of first sensor 310 and the second sensor 320, be designated as C
11and C
12, require statistical error to be better than one thousandth.
Step 1.3, instrument 300 is rotated to 180 °, make the second sensor 320 be in the side (being left side in Fig. 5) near sub-tank body 10, and be subject to the interior homogeneous of sub-tank body 10 and demarcate the radioactivity effect of material 12, and make first sensor 310 be in the side (being right side in Fig. 5) near rear radome 102.
Now, measure the stable original count rate C of first sensor 310 and the second sensor 320 with same requirement
21and C
22.
Step 1.4, be as the criterion with the counting rate of first sensor 310, by the count rate ratio of first sensor 310 and the second sensor 320, as the sensitivity normalization coefficient of the second sensor 320;
That is, the normalization coefficient that the normalization coefficient of first sensor 310 is made as to 1, the second sensor 320 is designated as K, and formula is as follows:
K = C
11/ C
22 ①
Carry out the normalized correction of sensitivity according to COEFFICIENT K, just can make these two sensors in identical stratum, obtain same measurement numerical value.
2, eliminate the method for another side formation influence;
Step 2.1 is to step 2.3, similar with the method for above-mentioned steps 1.1 ~ step 1.3,, first referring to Fig. 4, instrument 300 is placed on to one of them sub-tank body 10 to be connected in the shielding space 32 forming with rear radome 102, and record first sensor 310 in the time that the homogeneous near sub-tank body 10 is demarcated material 12, the stable original count rate that first, second sensor records is respectively C
11and C
12, then referring to Fig. 5, instrument 300 is overturn to 180 °, and make the second sensor 320 in the time that the homogeneous near sub-tank body 10 is demarcated material 12, the stable original count rate that first, second sensor records is respectively C
21and C
22.
The another side stratum contribution rate of step 2.4, definition first sensor 310 is b, refers to the radioactivity on the second residing that side stratum of sensor 320, on the impact of first sensor 310 measurement results; The contribution rate that defines the another side stratum of the second sensor 320 is a, and those parameters have following relation so:
C
12 = a×C
11 ，a = C
12/C
11 ②
C
21 = b×C
22 ，b = C
21/C
22 ③
In the actual normalization scaling method of describing in above-mentioned steps 1, be that the screen layer 330 in supposition instrument 300 decays to 0 by the contribution on another side stratum, and then at a=0, on the basis of b=0, carry out normalization.
Step 2.5, to establish the counting rate that first sensor 310, the second sensor 320 be derived from the contribution of homonymy stratum be n and m, specifically refers to and the radioactivity of sensor in stratum, phase the same side the value of contributing in this sensor gross-count rate.
In addition, instrument 300 is placed in to tank prover main body 101 complete shown in Fig. 5, the actual count rate that records these two sensors is respectively C
31with C
32, those parameters have following relation so:
C
31 = n+b×m ④
C
32 = a×n+m ⑤
According to above-mentioned formula 2. ~ 5., the n that 7. 6. solution formula obtain and m are exactly the survey data of having eliminated after another side formation influence:
m =（C
32-a×C
31）/（1-a×b） ⑥
n =（C
31-b×C
32）/（1-a×b） ⑦
3, API proofreaies and correct;
Suppose to have used high-precision and high-stability gamma ray logger device early stage, tank prover of the present invention has been carried out to the reverse scale of API, the radioactive intensity that obtains filled rock dust material is R.
In addition according to above-mentioned formula 1. 6. 7.,
K = C
11/ C
22 ①
m =（C
32-a×C
31）/（1-a×b） ⑥
n =（C
31-b×C
32）/（1-a×b） ⑦
Obtain parameter K, m, n, just can converse the API correction coefficient C on first, second sensor homonymy stratum
a1and C
a2.
C
A1 = R/n ⑧
C
A2 = R×K /m ⑨
When actual use, any natural gamma intensity level of the tested stratum of side take API as unit, the counting rate that is this side senser is multiplied by corresponding API correction coefficient.The average radioactive intensity on tested stratum is the average of these two component values.
In sum, the device and method that the two gamma instrument balances of directionality of the present invention are demarcated, provide one after radome and one may be split into the tank prover of two halves; A complete tank prover main body of corresponding use, or the assembly that rear radome and any one the sub-tank body splitting out are connected to form is as caliberating device, not only can be for carrying out conventional API correction with boring the two gamma instruments of directionality, can also carry out sensitivity normalization to the sensor of both sides in instrument, and eliminate the impact of side stratum radioactivity on opposite side sensor measurement; Thereby the overall performance of instrument and the response of single-sensor can both be unified after demarcating, overall measurement result or certain component value that instrument is drawn, all possess general comparativity.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Read after foregoing those skilled in the art, for multiple modification of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. the device that the two gamma instrument balances of directionality are demarcated, first sensor (310) and the second sensor (320) to relative 180 ° of layouts in the two gamma instruments (300) of described directionality are proofreaied and correct, and on hydrophthalmia (340) position between two sensors, correspondence is provided with directionality screen layer (330); It is characterized in that, the device that described balance is demarcated, comprises:
A tank prover, it comprises two independently sub-tank bodies (10); Two described sub-tank bodies (10) are connected and form the main body (101) of this tank prover; The inner side of each described sub-tank body (10) is provided with opening (13), and two described sub-tank bodies (10) are connected in the time that its opening (13) is relative, thereby at the upper shielding space (31) that forms of described tank prover main body (101);
In described tank prover main body (101) after connection, further comprise:
There is radioactive homogeneous in the periphery of described shielding space (31) around the circle arranging and demarcate material (12), and there is certain thickness radome (11) in the periphery of described homogeneous demarcation material (12) around the circle arranging; That is, each described sub-tank body (10) upper by inner side to outside, be formed with the described opening (13) that is equivalent to half shielding space (31) area, the described homogeneous demarcation material (12) of half-turn and the described radome (11) of half-turn;
The device that described balance is demarcated, also comprises:
One has certain thickness rear radome (102), and it is provided with the opening (23) that is equivalent to shielding space (31) area described in half; By in described rear radome (102) and tank prover described in any one sub-tank body (10) be connected, make the opening (23) of described rear radome (102) relative with the opening (13) of described sub-tank body (10), thereby form another shielding space (32);
Two described shielding spaces (31,32) match with the outer wall (350) of instrument to be corrected (300), at timing signal, described instrument (300) correspondence is placed in the upper shielding space (31) being connected to form by two described sub-tank bodies (10) of a described tank prover main body (101), or is placed in the shielding space (32) being connected to form by described rear radome (102) and sub-tank body (10) described in one of them.
2. the device that the two gamma instrument balances of directionality are demarcated as claimed in claim 1, is characterized in that,
Radome (11) and the rear radome (102) of described tank prover are made up of lead;
The consistency of thickness of described radome (11) and rear radome (102); For the requirement of described thickness, should meet the local radioactive background radiation of the device outside that described balance is demarcated, decay to described homogeneous and demarcate below one of percentage of material (12) radioactive intensity.
3. the device that the two gamma instrument balances of directionality are demarcated as claimed in claim 1, is characterized in that,
It is the high radioactivity rock dust of uniform filling in the sub-tank body (10) of described tank prover that described homogeneous is demarcated material (12).
4. the device that the two gamma instrument balances of directionality are demarcated as claimed in claim 2, is characterized in that,
Described tank prover main body (101) is a cylinder, and two described sub-tank bodies (10) are two symmetrical semicircular cylinders; Being coordinated the shielding space (31) forming by the opening (13) of two described sub-tank bodies (10), is the circular space that is positioned at this tank prover main body (101) center.
5. the device that the two gamma instrument balances of directionality are demarcated as claimed in claim 4, is characterized in that,
Described rear radome (102) is provided with a semicircle segmental arc (21), one side of described semicircle segmental arc (21) is formed as semicircular opening (23), and described opening (23) matches with the opening (13) of sub-tank body (10) described in one of them and forms shielding space (32);
Described semicircle segmental arc (21) two ends are also provided with two straightways (22), two described straightways (22) layout that stretches out along the two ends of the upper diameter (L) of semicircle segmental arc (21) place straight line; Described rear radome (102) is by two described straightways (22), with the corresponding connection in radome (11) two ends of sub-tank body (10) described in one of them.
6. the device that the two gamma instrument balances of directionality are demarcated as claimed in claim 5, is characterized in that,
When instrument (300) to be corrected is placed in the shielding space (32) being connected to form by described rear radome (102) and sub-tank body (10) described in one of them, make the line of two sensors in this instrument (300) and the line of the interior straightway of described rear radome (102) perpendicular;
And, make described first sensor (310) be in the side near sub-tank body (10), the second sensor (320) is in the side near rear radome (102); Or, make described the second sensor (320) be in the side near sub-tank body (10), first sensor (310) is in the side near rear radome (102).
7. the method that the two gamma instrument balances of directionality are demarcated, right to use requires the device described in 1 to demarcate the two gamma instruments (300) of directionality, it is characterized in that, comprises:
Instrument to be corrected (300) is placed in the shielding space (32) being connected to form by described rear radome (102) and sub-tank body (10) described in one of them, make first sensor (310) and second sensor (320) of relative 180 ° of layouts in instrument (300), in the radioactivity effect of demarcating material (12) near a side of described sub-tank body (10) the homogeneous of wherein being filled, measure respectively, thereby instrument (300) is carried out to the method for sensitivity normalization; Also comprise:
Further described instrument (300) is placed in upper another shielding space (31) being connected to form by two described sub-tank bodies (10) of a complete tank prover main body (101), the method of the impact of the radioactivity of eliminating instrument (300) one side stratum on sensor measurement in opposite side, and the method that instrument (300) is carried out to API correction.
8. the method that the two gamma instrument balances of directionality are demarcated as claimed in claim 7, is characterized in that,
The method of described sensitivity normalization, specifically comprises following steps:
Step 1.1, instrument to be corrected (300) is placed on by described rear radome (102) and the shielding space (32) that is connected to form of sub-tank body (10) described in one of them;
Step 1.2, make first sensor (310) in described instrument (300) be in the side near described sub-tank body (10), and be subject to described homogeneous and demarcate the radioactivity effect of material (12), and make the second sensor (320) be in the side near rear radome (102); Now, measure the stable original count rate C of first sensor (310) and the second sensor (320)
11and C
12;
Step 1.3, by instrument (300) rotate 180 °, make described the second sensor (320) be in the side near sub-tank body (10), and be subject to described homogeneous and demarcate the radioactivity effect of material (12), and make described first sensor (310) be in the side near rear radome (102); Now, again measure the stable original count rate C of first sensor (310) and the second sensor (320)
21and C
22;
Step 1.4, the normalization coefficient of first sensor (310) is made as to 1, calculates the count rate ratio of first sensor (310) and the second sensor (320), as the normalization coefficient K of the second sensor (320); Formula is as follows:
K = C
11/ C
22 ①
According to COEFFICIENT K, instrument (300) is carried out to sensitivity normalization.
9. the method that the two gamma instrument balances of directionality are demarcated as claimed in claim 8, is characterized in that,
The method of the another side formation influence of described elimination, comprises:
Step 2.1 is to step 2.3, instrument to be corrected (300) is placed in to shielding space (32) the upset of described rear radome (102) and sub-tank body (10) cooperation formation, by measuring respectively before and after first sensor (310), the each comfortable upset of the second sensor (320), obtain the stable original count rate C before first sensor (310) upset
11, the stable original count rate C before the second sensor (320) upset
21, the stable original count rate C after first sensor (310) upset
21, and stable original count rate C after the second sensor (320) upset
22;
Described method further comprises:
Step 2.4, according to described stable original count rate C
11, C
12and C
21, C
22, obtain the another side stratum contribution rate b of first sensor (310) by following formula, and the contribution rate a on the another side stratum of the second sensor (320), formula is as follows:
C
12 = a×C
11 ，a = C
12/C
11 ②
C
21 = b×C
22 ，b = C
21/C
22 ③
Step 2.5, described instrument (300) is placed in to tank prover main body (101) is coordinated in the shielding space (31) forming by two described sub-tank bodies (10), record the actual count rate C of these two sensors
31with C
32;
If it is n and m that first sensor (310), the second sensor (320) are derived from the counting rate of homonymy stratum contribution; According to another side stratum contribution rate a and the b of two described sensors, by following formula, solve and obtain n, m;
C
31 = n+b×m ④
C
32 = a×n+m ⑤
m =（C
32-a×C
31）/（1-a×b） ⑥
n =（C
31-b×C
32）/（1-a×b） ⑦
The described counting rate that is derived from homonymy stratum contribution is n, m, is exactly to have eliminated first, second sensor survey data separately after another side formation influence.
10. the method that the two gamma instrument balances of directionality are demarcated as claimed in claim 9, is characterized in that,
The method that described API proofreaies and correct, comprises:
The radioactive intensity that records the homogeneous demarcation material (12) of filling in described tank prover is R;
And, take first sensor (310) as benchmark, the normalization coefficient K of the second sensor (320) calculating; And to calculate first, second sensor source be n, m from the counting rate of homonymy stratum contribution;
According to parameters R, K, m, n, convert and obtain the API correction coefficient C on first, second sensor homonymy stratum
a1and C
a2:
C
A1 = R/n ⑧
C
A2 = R×K /m ⑨
When actual measurement, any natural gamma intensity level of the tested stratum of side take API as unit, the counting rate that is this side senser is multiplied by corresponding API correction coefficient; The average radioactive intensity on tested stratum is the average of these two sensor component values.
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| CN101749009A (en) * | 2009-12-11 | 2010-06-23 | 中国石油集团长城钻探工程有限公司 | Radioactive guide instrument type double-sleeve azimuth measuring method |
| CN202325498U (en) * | 2011-12-02 | 2012-07-11 | 上海神开石油化工装备股份有限公司 | Balanced calibration device for directional double-gamma instrument |
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| CN102034411B (en) * | 2009-09-29 | 2013-01-16 | 群康科技(深圳)有限公司 | Gamma correction control device and method thereof |
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| CN101377919A (en) * | 2007-08-28 | 2009-03-04 | 晨星半导体股份有限公司 | Gamma correction device |
| CN101749009A (en) * | 2009-12-11 | 2010-06-23 | 中国石油集团长城钻探工程有限公司 | Radioactive guide instrument type double-sleeve azimuth measuring method |
| CN202325498U (en) * | 2011-12-02 | 2012-07-11 | 上海神开石油化工装备股份有限公司 | Balanced calibration device for directional double-gamma instrument |
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Effective date of registration: 20190315 Address after: Two Blocks 1769 Puxing Highway, Minhang District, Shanghai, 20114 Co-patentee after: Shanghai Shenkai Petroleum & Chemical Equipment Corporation Ltd. Patentee after: Shanghai Shen Kai Petroleum Measurement and Control Technology Co., Ltd. Co-patentee after: Shanghai Shenkai Petroleum Equipment Co., Ltd. Co-patentee after: Shanghai Shenkai Petroleum Sci-Tech Co., Ltd. Address before: 201114, Shanghai, Minhang District Pu Xing Road No. 1769 Co-patentee before: Shanghai Shenkai Petroleum Equipment Co., Ltd. Patentee before: Shanghai Shenkai Petroleum & Chemical Equipment Corporation Ltd. Co-patentee before: Shanghai Shenkai Petroleum Sci-Tech Co., Ltd. |