CN112302641A - Well site calibration device of neutron porosity logging while drilling instrument and use method - Google Patents
Well site calibration device of neutron porosity logging while drilling instrument and use method Download PDFInfo
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- CN112302641A CN112302641A CN202011183167.8A CN202011183167A CN112302641A CN 112302641 A CN112302641 A CN 112302641A CN 202011183167 A CN202011183167 A CN 202011183167A CN 112302641 A CN112302641 A CN 112302641A
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- 238000012795 verification Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000002285 radioactive effect Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000010200 validation analysis Methods 0.000 description 4
- 238000000342 Monte Carlo simulation Methods 0.000 description 3
- SWQJXJOGLNCZEY-BJUDXGSMSA-N helium-3 atom Chemical compound [3He] SWQJXJOGLNCZEY-BJUDXGSMSA-N 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
Abstract
The invention relates to a well site calibration device of a neutron porosity logging-while-drilling tool and a using method thereof.A box body in the device is a hollow cuboid and is used for containing water or organic glass, the end surface of a bottom cover is arranged in a concave manner, is lapped on the outer diameter of the tool and covers a detection area, and the distance between the top of the tool and the upper surface of the water or organic glass is more than or equal to 25 cm; the instrument is lapped in the groove on the upper surface of the first support, and the second supports in front of and behind the box body are fixedly lapped on the outer diameter of the instrument, so that the box body is horizontally arranged on the instrument. When in use, the instrument transmits the value to the box body to obtain the counting rate N with short source distanceSSAnd a counting rate N of a long source distanceLSThen obtaining another group of data, and adjusting the target pressure step number to enable | NSS‑N′SS|/NSS<0.1、|NLS‑N′LS|/NLS<0.1, can ensure the circuit system of the instrument in the downhole operation and the neutron yield to be stable and reliableThe stability of high measurement curve has reduced the risk of drawing a hole.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling, and particularly relates to a well site calibration device of a neutron porosity logging-while-drilling instrument and a using method of the well site calibration device.
Background
The neutron porosity while drilling logging instrument is one of radioactive while drilling instruments, and the response of the neutron porosity while drilling logging instrument mainly reflects the content of hydrogen elements in rock. The neutron porosity logging-while-drilling instrument measures the attenuation rate of the density of the epithermal neutrons which are not captured by the stratum along with the source distance by utilizing a chemical neutron source and two detectors of long and short source distances, and converts the attenuation rate into a porosity value after scale. The instrument is slightly influenced by a borehole, and can accurately and reliably acquire porosity parameters. In the process of geosteering drilling, a guarantee is provided for the system to implement accurate guidance. The radioactive source used by the neutron porosity logging-while-drilling instrument comprises a chemical source Am-Be and a controllable source D-T neutron generator, a helium 3 neutron detector or a Li glass detector is used as the detector, and the porosity is calculated according to the counting rate ratio of a far/near detector.
After the instrument is developed, primary calibration needs to be carried out in a primary calibration well so as to establish a response relation, secondary calibration needs to be carried out due to the assembly size of a well-entering operation part and the factor change of an electronic system in a specified period, and the primary calibration and the secondary calibration form relatively complete technology and devices at present.
When the neutron porosity logging-while-drilling tool is pulled to a well site to prepare for being put down, the stability of a circuit system of the neutron porosity logging-while-drilling tool can only be tested, and radioactive working state detection cannot be carried out at the well site.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a well site calibration device of a neutron porosity logging-while-drilling instrument and a using method thereof, which can realize the well site calibration of the neutron porosity logging-while-drilling instrument, can regulate the neutron yield of the neutron porosity logging-while-drilling instrument by regulating the target pressure step number of a neutron generator, ensure that a circuit system and the neutron yield of the instrument in the downhole operation are stable and reliable, improve the stability of a measurement curve and reduce the risk of tripping a drill.
The invention is realized by the following technical scheme:
a well site calibration device of a neutron porosity logging while drilling tool comprises a first support, a liquid level meter, a level gauge, a second support and a box body;
the box body is a cuboid with a hollow structure, the box body is used for containing water or organic glass, the organic glass is attached to four inner walls of the box body, the box body is provided with an upper cover and a bottom cover, the end face of the bottom cover is arranged in an inwards concave manner, the bottom cover is lapped on the outer diameter of the neutron porosity logging-while-drilling instrument and covers a detection area of the neutron porosity logging-while-drilling instrument, and the distance between the top of the neutron porosity logging-while-drilling instrument and the upper surface of the water or the organic glass in the upper cover is more than or equal to 25;
the neutron porosity logging while drilling apparatus is in lap joint in the groove of the upper surface of the first support along the horizontal direction, the groove of the upper surface of the first support is used for preventing the neutron porosity logging while drilling apparatus from rolling, the front side and the rear side of the box body are fixedly provided with second supports, the second supports are fixedly in lap joint on the outer diameter of the neutron porosity logging while drilling apparatus, and the box body is horizontally arranged on the neutron porosity logging while drilling apparatus.
Preferably, the box body is made of iron, copper, aluminum or stainless steel.
Preferably, the distance between the top of the neutron porosity logging while drilling tool and the upper surface of the water or organic glass in the upper cover is 25-40 cm.
Preferably, the end face of the bottom cover is of a semicircular structure, and the radius of the semicircle is 0.3-0.5cm larger than that of the neutron porosity logging-while-drilling tool.
Preferably, when the box splendid attire water, one side of box was provided with the level gauge along the vertical direction, is provided with water inlet and outlet on the box, covers on and is provided with the spirit level.
Furthermore, the water outlet and the liquid level meter are arranged on the same side of the box body, a water outlet switch is welded on the water outlet, and the water inlet is arranged on the upper cover.
Preferably, the cross section of the second bracket is U-shaped, and the second bracket is welded on the front side and the rear side of the box body; the second support is fixedly overlapped on the outer diameter of the while-drilling neutron porosity logging instrument through a stud and a bolt, the stud penetrates through the second support from top to bottom and abuts against the outer diameter of the while-drilling neutron porosity logging instrument, and the bolt horizontally penetrates through the second support from one side of the second support and abuts against the outer diameter of the while-drilling neutron porosity logging instrument.
Preferably, the second bracket is provided with a handle outwards along the horizontal direction.
Preferably, one side of the box in the front-back direction is provided with a detector fixing hole, the detector fixing hole is arranged opposite to a neutron generator of the neutron porosity logging-while-drilling instrument, the horizontal cylinder penetrates into the box through the detector fixing hole in the horizontal direction, the horizontal cylinder and the detector fixing hole are arranged in a sealing mode, and a helium neutron detector is arranged in the horizontal cylinder.
A use method of a well site calibration device of a neutron porosity while drilling logging instrument is based on any one of the well site calibration devices of the neutron porosity while drilling logging instrument, and comprises the following steps:
The invention has the following beneficial technical effects:
the invention relates to a well site calibration device of a neutron porosity while drilling logging instrument, a cuboid box body with a hollow structure can contain water or organic glass, the organic glass is attached to four inner walls of the box body, the end face of a bottom cover is concave and can be lapped on the outer diameter of the neutron porosity while drilling logging instrument and cover a detection area of the neutron porosity while drilling logging instrument, so that according to Monte Carlo simulation experiment data, the distance between the top of the neutron porosity while drilling logging instrument and the upper surface of water or organic glass in an upper cover is more than or equal to 25cm, the maximum effective porosity value simulated in specific application can be ensured to be more than 10p.u, when the box body contains water, the device can be saved, and the volume can be controlled in real time through water; the neutron porosity logging instrument while drilling is overlapped in the groove in the upper surface of the first support along the horizontal direction, so that the groove in the upper surface of the first support can prevent the neutron porosity logging instrument while drilling from rolling, the second support is fixedly overlapped on the outer diameter of the neutron porosity logging instrument while drilling, the box body can be horizontally arranged on the neutron porosity logging instrument while drilling, and the measurement requirement is met. The well site calibration device can realize the well site radioactivity calibration of neutron porosity logging instruments of different types such as a chemical source and a controllable source while drilling, adjust the neutron yield, ensure a circuit system of the instrument in the well descending operation and the stability and reliability of the neutron yield, improve the stability of a measurement curve and reduce the risk of tripping.
The invention relates to a use method of a well site calibration device of a while-drilling neutron porosity logging instrument, which comprises the steps of firstly overlapping the while-drilling neutron porosity logging instrument in a groove on the upper surface of a first support along the horizontal direction, then containing water or organic glass in a box body, enabling the distance between the top of the while-drilling neutron porosity logging instrument and the upper surface of the water or the organic glass in an upper cover to be more than or equal to 25cm, conveniently overlapping the box body on the outer diameter of the while-drilling neutron porosity logging instrument and covering a detection area of the while-drilling neutron porosity logging instrument, fixedly overlapping a second support on the outer diameter of the while-drilling neutron porosity logging instrument, enabling the box body to be horizontally arranged on the while-drilling neutron porosity logging instrument, and meeting the measurement requirement; finally, the box body is transmitted by a neutron porosity logging instrument while drilling, so that the counting rate N of the short source distance can be obtainedSSAnd a counting rate N of a long source distanceLSThe neutron yield can be reduced to a certain extent after the device is used for a period of time, and factors such as instrument assembly and the like influence the porosity, so that the counting rate N of the short source distance can be obtained in the same wayS′SAnd a counting rate N of a long source distanceL′SBy adjusting the target pressure step number of the neutron generator, the absolute value of NSS-NS′S|/NSS<0.1、|NLS-NL′S|/NLS<And 0.1, well site verification of the neutron porosity logging while drilling instrument can be completed.
Drawings
FIG. 1 is a first-order scale relationship simulation curve of a controllable source-while-drilling neutron porosity logging instrument according to the present invention;
FIG. 2 is a simulation curve of effective porosity after water and organic glass are respectively contained in a sealed box of the well site calibration device;
FIG. 3 is a schematic diagram of a front end configuration of a wellsite calibration device of the present invention;
FIG. 4 is a schematic view of a back end configuration of the wellsite calibration device of the present invention;
FIG. 5 is a longitudinal cross-sectional view of the wellsite calibration device of the present invention;
FIG. 6 is a cross-sectional view of the wellsite calibration device of the present invention;
FIG. 7 is a schematic perspective view of the wellsite verification device of the present invention in use.
In the figure: 1-a first scaffold; 2-neutron porosity while drilling logging tool; 3-a liquid level meter; 4-a water outlet; 5-a level meter; 6-water inlet; 7-detector fixing holes; 8-a stud; 9-a handle; 10-upper cover; 11-a bottom cover; 12-a second scaffold; 13-bolt.
Detailed Description
The technical solutions are described below clearly and completely with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, not all embodiments of the present invention.
The invention discloses a well site calibration device of a neutron porosity logging-while-drilling tool, which comprises a first support 1, a liquid level meter 3, a level meter 5, a second support 12 and a box body, wherein the first support is connected with the second support through a pipeline; the box is hollow structure's cuboid, and the box is used for splendid attire water, and the box is provided with upper cover 10 and bottom 11, and the terminal surface of bottom 11 becomes the indent setting, and bottom 11 overlap joint is on the external diameter of following the drill neutron porosity logging instrument 2 and cover the detection zone of following the drill neutron porosity logging instrument 2, and the distance of the top of following the drill neutron porosity logging instrument 2 and upper surface of water in upper cover 10 is more than or equal to 25 cm.
The neutron porosity logging instrument while drilling 2 is lapped in the groove in the upper surface of the first support 1 along the horizontal direction, the groove in the upper surface of the first support 1 is used for preventing the neutron porosity logging instrument while drilling 2 from rolling, the second supports 12 are fixedly arranged on the front side and the rear side of the box body, the second supports 12 are fixedly lapped on the outer diameter of the neutron porosity logging instrument while drilling 2, and the box body is horizontally arranged on the neutron porosity logging instrument while drilling 2.
When the box hold water, one side of box is provided with level gauge 3 along the vertical direction, is provided with water inlet 6 and outlet 4 on the box, is provided with spirit level 5 on the upper cover 10.
The box body is formed by welding stainless steel or metal materials with certain hardness such as iron, copper and aluminum, the box body comprises an upper cover 10, a right cover, a left cover, a bottom cover 11, a rear cover and a front cover, the size of the box body is ensured not to change after water is contained, effective porosity precision can be ensured, the stainless steel is anti-collision and anti-deformation stainless steel 304 and stainless steel P550, the height of the box body is designed to be 25cm-40cm according to Monte Carlo simulation experiment data, and therefore the maximum effective porosity value can be ensured to be 10p.u. -30 p.u.; the end face of the bottom cover 11 is of a semicircular structure with a certain curvature radius, and the radius of the bottom cover is larger than or equal to that of the neutron porosity logging-while-drilling instrument 2, so that the device can be placed on the instrument and is generally larger than 0.3-0.5cm, and the state that the neutron porosity logging-while-drilling instrument 2 is attached to a well wall can be simulated.
The left cover is provided with a liquid level meter 3 and a water outlet 4, a water outlet switch is installed on the water outlet 4 in a welding mode, a level meter 5 and a water inlet 6 are arranged on the upper cover 10, and the level meter 5 ensures that the neutron porosity logging-while-drilling tool 2 and the checking device are both in a horizontal position in the whole testing process, so that the liquid level meter 3 can monitor the height of water and accurately control the effective porosity value; the rear cover and the front cover are respectively provided with a stud 8, a handle 9 and a support 12, as shown in fig. 3 and 4, the cross section of the second support 12 is U-shaped and is welded on the rear cover and the front cover, the handle 9 is welded on the second support 12 along the horizontal direction, the second support 12 is fixedly overlapped on the outer diameter of the while-drilling neutron porosity logging instrument 2 through the studs 8 and bolts 13, the studs 8 penetrate through the second support 12 from top to bottom and are tightly propped on the outer diameter of the while-drilling neutron porosity logging instrument 2, the bolts 13 horizontally penetrate through the second support 12 from one side of the second support 12 and are tightly propped on the outer diameter of the while-drilling neutron porosity logging instrument 2, and the studs 8 can prevent the box body from being inclined and overturned. The bolt 13 tightly pushes the box body and the logging-while-drilling neutron porosity logging instrument 2 to ensure that relative movement or rotation does not occur.
As shown in fig. 5 and 6, the detector fixing hole 7 is disposed on one side of the front-back direction of the box body, and specifically, the detector fixing hole 7 may be disposed on the front cover box body, and the detector fixing hole 7 is disposed opposite to a neutron generator of the neutron porosity logging while drilling instrument 2, a light and thin-walled horizontal tube extends into the box body from the detector fixing hole 7 along the horizontal direction, and is welded at the detector fixing hole 7, so that a certain sealing performance can be maintained, and then a helium 3 neutron detector may be installed in the horizontal tube, so that detection efficiency of the helium 3 neutron detector can be detected and relatively evaluated after a fixed distance.
The device of the invention is designed as follows: firstly, performing 1:1 modeling on a neutron porosity logging-while-drilling instrument 2 and the calibration device according to actual sizes by a Monte Carlo method, performing simulation calculation to obtain a first-level scale response relation of the neutron porosity-while-drilling controllable as shown in figure 1, and simulating the effective porosity when two alternative materials (water and organic glass) are placed in an instrument detection area, wherein as shown in figure 2, when other conditions are unchanged, the distance between the top of the neutron porosity-while-drilling instrument 2 and the top of a well site scale device is more than 25cm, so that the equivalent porosity is not greatly influenced, and compared with the water and the organic glass, the equivalent porosity of the water is superior to the organic glass, namely, the same volume of water is less, and the volume can be controlled in real time by the water; therefore, the sealed water tank is selected as a main component of the well site calibration device.
When the well site validation device of the neutron porosity logging while drilling instrument is used for testing experiments, after the instrument finishes primary scale in a primary scale well, firstly, the neutron porosity logging while drilling instrument 2 is lapped in a groove on the upper surface of a first support 1 along the horizontal direction as shown in figure 7; the box body is filled with water, so that the distance between the top of the while-drilling neutron porosity logging instrument 2 and the surface of the water in the upper cover 10 is more than or equal to 25cm, then the box body is lapped on the outer diameter of the while-drilling neutron porosity logging instrument 2 and covers the detection area of the while-drilling neutron porosity logging instrument 2, and the second support 12 is fixedly lapped on the outer diameter of the while-drilling neutron porosity logging instrument 2, so that the box body is horizontally arranged on the while-drilling neutron porosity logging instrument 2; specifically, the well site validation device of the while-drilling neutron porosity logging instrument is placed at a calibration position right above the while-drilling neutron porosity logging instrument 2, and the position can ensure that the validation device completely covers one radioactive source (namely a neutron generator) and two detectors (namely neutron detectors), so that the validation device can completely cover one radioactive source (namely a neutron generator) and two detectors (namely neutron detectors)The testing result can be guaranteed not to be influenced by the position of the device and the instrument, after the device and the instrument are fastened by the bolts 13, water is poured into the box body, and the height of the water surface is observed until the distance L between the top of the while-drilling neutron porosity logging instrument 2 and the water surface reaches 25-45 cm; the device is transmitted by a neutron porosity logging-while-drilling instrument 2 to obtain the counting rate N of the short source distanceSSAnd a counting rate N of a long source distanceLSAfter the instrument is used for a period of time, the neutron yield may be reduced to some extent, and the counting rate N 'of the short source distance is measured through the experiment of the field graduator'SSCount rate N 'of long source distance'LSBy adjusting the target pressure step number of the neutron generator, the absolute value of NSS-N′SS|/NSS<0.1、|NLS-N′LS|/NLS<And 0.1, well site verification of the neutron porosity logging-while-drilling instrument can be completed, and the measurement stability is ensured. A smaller ratio is better, indicating a smaller change in neutron yield over time.
The following are exemplified:
(1) when the target pressure is 13 steps at the first-level scale,
wherein N isSS＝2688.40；NLS＝176.80
NSS/NLS＝15.22；
Substituting the ratio into R in a primary scale formula to obtain a formation porosity value:
Por＝-2.1543-1.2702*R+0.28184*R2-0.01367*R3+0.000227145*R4＝9.80p.u.
(2) after the neutron yield is reduced after a period of time, the well site scales:
wherein N'SS＝1571.65；N′LS＝100.49
N′SS/N′LS＝15.68；
Substituting the ratio into R in a primary scale formula to obtain a formation porosity value:
Por′＝-2.1543-1.2702*R+0.28184*R2-0.01367*R3+0.000227145*R4＝10.25p.u.
the influence on the porosity when the neutron yield, the instrument assembly and the like are changed is examined:
therefore, after the instrument is used for a long time, the influence of factors such as neutron yield and instrument assembly on the porosity is changed by 2.3%, and although the neutron porosity logging instrument is in the measurement precision range of the neutron porosity logging instrument while drilling, the neutron yield can be increased by adjusting the target pressure step number of the neutron generator to perfect the measurement precision.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A well site calibration device of a neutron porosity logging-while-drilling instrument is characterized by comprising a first support (1), a liquid level meter (3), a level meter (5), a second support (12) and a box body;
the box body is a cuboid with a hollow structure and is used for containing water or organic glass, the organic glass is attached to four inner walls of the box body, the box body is provided with an upper cover (10) and a bottom cover (11), the end face of the bottom cover (11) is arranged in an inwards concave manner, the bottom cover (11) is lapped on the outer diameter of the neutron porosity logging-while-drilling instrument (2) and covers a detection area of the neutron porosity logging-while-drilling instrument (2), and the distance between the top of the neutron porosity logging-while-drilling instrument (2) and the upper surface of the water or the organic glass in the upper cover (10) is more than or equal to 25 cm;
while-drilling neutron porosity logging instrument (2) along the horizontal direction overlap joint in the recess of first support (1) upper surface, the recess of first support (1) upper surface is used for preventing while-drilling neutron porosity logging instrument (2) from rolling, both sides are fixed around the box are provided with second support (12), the fixed overlap joint of second support (12) is on the external diameter of while-drilling neutron porosity logging instrument (2), make the box be horizontal setting on while-drilling neutron porosity logging instrument (2).
2. The wellsite calibration device for a neutron porosity-while-drilling tool as recited in claim 1, wherein the box is made of iron, copper, aluminum or stainless steel.
3. The wellsite verification device of the neutron porosity while drilling tool as recited in claim 1, wherein the distance between the top of the neutron porosity while drilling tool (2) and the upper surface of water or organic glass in the upper cover (10) is 25-40 cm.
4. The well site calibration device of the neutron porosity while drilling logging instrument as recited in claim 1, wherein the end face of the bottom cover (11) is of a semicircular structure, and the radius of the semicircle is 0.3-0.5cm larger than that of the neutron porosity while drilling logging instrument (2).
5. The well site calibration device of the neutron porosity while drilling tool as recited in claim 1, characterized in that when the box body contains water, one side of the box body is provided with a liquid level meter (3) along the vertical direction, the box body is provided with a water inlet (6) and a water outlet (4), and the upper cover (10) is provided with a level meter (5).
6. The well site calibration device of the neutron porosity while drilling logging instrument as recited in claim 5, wherein the water outlet (4) and the liquid level meter (3) are arranged on the same side of the box body, the water outlet (4) is welded with a water outlet switch, and the water inlet (6) is arranged on the upper cover (10).
7. The well site calibration device of the neutron porosity while drilling tool as recited in claim 1, characterized in that the cross section of the second support (12) is U-shaped, and the second support (12) is welded at the front side and the rear side of the box body; the second support (12) is fixedly lapped on the outer diameter of the while-drilling neutron porosity logging instrument (2) through a stud (8) and a bolt (13), the stud (8) penetrates through the second support (12) from top to bottom and abuts against the outer diameter of the while-drilling neutron porosity logging instrument (2), and the bolt (13) horizontally penetrates through the second support (12) from one side of the second support (12) and abuts against the outer diameter of the while-drilling neutron porosity logging instrument (2).
8. The wellsite verification device for a neutron porosity-while-drilling tool as recited in claim 1, wherein the second support (12) is provided with a handle (9) horizontally and outwardly.
9. The well site calibration device of the neutron porosity logging while drilling tool as recited in claim 1, characterized in that a detector fixing hole (7) is arranged on one side of the box body in the front-back direction, the detector fixing hole (7) is arranged opposite to a neutron generator of the neutron porosity logging while drilling tool (2), a horizontal cylinder is arranged to penetrate into the box body in the horizontal direction through the detector fixing hole (7), the horizontal cylinder is arranged to be sealed with the detector fixing hole (7), and a helium (3) neutron detector is arranged in the horizontal cylinder.
10. The use method of the well site verification device of the neutron porosity while drilling logging instrument is characterized in that the well site verification device of the neutron porosity while drilling logging instrument is based on any one of claims 1 to 9 and comprises the following steps:
step 1, overlapping a neutron porosity logging-while-drilling instrument (2) in a groove on the upper surface of a first support (1) along the horizontal direction;
step 2, containing water or organic glass in the box body, enabling the distance between the top of the while-drilling neutron porosity logging instrument (2) and the upper surface of the water or organic glass in the upper cover (10) to be more than or equal to 25cm, then overlapping the box body on the outer diameter of the while-drilling neutron porosity logging instrument (2) and covering the detection area of the while-drilling neutron porosity logging instrument (2), and fixedly overlapping the second support (12) on the outer diameter of the while-drilling neutron porosity logging instrument (2) to enable the box body to be horizontally arranged on the while-drilling neutron porosity logging instrument (2);
step 3, transmitting the value of the box body by using the neutron porosity logging while drilling instrument (2) to obtain the counting rate N of the short source distanceSSAnd a counting rate N of a long source distanceLSThen, the counting rate N 'of the short source distance is obtained in the same manner'SSAnd count rate N 'of long source pitch'LSBy adjusting the target pressure step number of the neutron generator, the absolute value of NSS-N′SS|/NSS<0.1、|NLS-N′LS|/NLS<And 0.1, completing the well site verification of the neutron porosity logging while drilling tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011183167.8A CN112302641A (en) | 2020-10-29 | 2020-10-29 | Well site calibration device of neutron porosity logging while drilling instrument and use method |
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| CN202011183167.8A CN112302641A (en) | 2020-10-29 | 2020-10-29 | Well site calibration device of neutron porosity logging while drilling instrument and use method |
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