阅读说明：本技术 一种便携式补偿中子测井仪刻度装置 (Portable compensation neutron logging instrument calibration device ) 是由 杨志高 徐强 于 2020-06-12 设计创作，主要内容包括：本发明涉及一种便携式补偿中子测井仪刻度装置。刻度装置包括中心管,中心管外部设置有水囊,水囊的外部设置有气囊。本发明具有体积小、重量轻、安装方便的优点。(The invention relates to a portable compensated neutron logging instrument calibration device. The scale device comprises a central tube, a water bag is arranged outside the central tube, and an air bag is arranged outside the water bag. The invention has the advantages of small volume, light weight and convenient installation.)

1. The utility model provides a portable compensation neutron logging instrument scale device which characterized in that: the scale device comprises a central tube, a water bag is arranged outside the central tube, and an air bag is arranged outside the water bag.

2. The portable compensated neutron tool scale device of claim 1, wherein: the water bag encircles and sets up in the center tube outside, the gasbag encircles and sets up in the water bag outside, the laminating of water bag outer wall and the inner wall of gasbag.

3. The portable compensated neutron tool scale device of claim 2, wherein: and a rope is arranged on the inner wall of the air bag.

4. The portable compensated neutron tool scale device of claim 3, wherein: the ropes are uniformly distributed on the inner wall of the air bag in a net shape.

5. The portable compensated neutron tool scale device of claim 4, wherein: and an air column for connecting the inner wall and the outer wall of the air bag is arranged in the air bag.

6. The portable compensated neutron tool scale device of claim 5, wherein: the air columns are multiple and are uniformly distributed in the air bag.

7. The portable compensated neutron tool scale device of any of claims 1 to 6, wherein: the water bag and the air bag are of an integrated structure.

8. The portable compensated neutron tool scale device of claim 7, wherein: the scale device further comprises an air pump and a water pump, the air pump is connected with the air bag, and the water pump is connected with the water bag.

9. The portable compensated neutron tool scale device of claim 8, wherein: the water bag and the air bag are both made of rubber materials.

10. The portable compensated neutron tool scale device of claim 9, wherein: the central tube is made of hard plastic materials.

Technical Field

The invention relates to the technical field of compensated neutron logging instruments, in particular to a portable calibration device for a compensated neutron logging instrument.

Background

The graduator is a special measuring standard instrument for transmitting the porosity measurement value of a neutron porosity standard well group (a standard well for short) to a compensated neutron logging instrument (a logging instrument for short).

The compensated neutron well logging instrument uses isotope neutron source to emit fast neutrons to stratum in well bore, uses thermal neutron detector to measure the thermal neutrons which are moderated by stratum and scattered back to well bore on two observation points with different distances from source, and uses the ratio of counting rate of near and far two detectors to measure the porosity of stratum.

The graduator is an equivalent device for simulating a plurality of porosities of a stratum, and is made into an annular cylinder in order to ensure that neutrons are uniform in all directions when propagating in the graduator, and the annular cylinder is filled with fresh water and used for decelerating and reflecting the neutrons. The diameter of the inner cylinder is larger than the outer diameter of the logging instrument. During calibration, the logging instrument is placed in the inner cylinder, some neutron deceleration materials are inserted to change the simulated porosity equivalent value, the calibrator has one porosity value as a calibration point, and other porosity values as check points. When detecting, a standard compensation neutron logging instrument (called as a standard instrument) is placed in the graduator, a neutron source in the standard instrument emits fast neutrons to the periphery, the fast neutrons are decelerated to water and a neutron deceleration material diffusion well in the annular cylinder, finally become thermal neutrons, and are detected and recorded by the long and short source distance detectors. The ratio of the count rates recorded by the long and short source-distance detectors is a function of the porosity, which has been measured in a standard well by a standard instrument. The scale porosity value and uncertainty can be calculated according to the functional relation.

The existing graduator main body is a cylindrical steel cylinder with the diameter of 800x1600, the volume is large, the empty cylinder weighs about 100kg, when the cylinder is filled with fresh water, the empty cylinder weighs about 977kg and approaches 1 ton, and the existing graduator main body is very heavy and inconvenient to transport due to the weight of accessories such as a bracket and the like and the weight of packages. The oil exploration is carried out in the field, the large-size and heavy graduator is carried by a special vehicle to be transported, and the heavy graduator can be used only by being equipped with a hoisting device, so that great inconvenience is brought to the compensation of the field scale of the neutron logging instrument.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention aims to provide a portable compensation neutron logging instrument calibration device which has the advantages of small volume, light weight, convenience in installation and the like.

The technical solution of the invention is as follows: the invention relates to a portable compensated neutron logging instrument calibration device, which is characterized in that: the scale device comprises a central tube, a water bag is arranged outside the central tube, and an air bag is arranged outside the water bag.

Preferably, the water bag encircles and sets up in the center tube outside, and the gasbag encircles and sets up in the water bag outside, and the water bag outer wall laminates with the inner wall of gasbag.

Preferably, the inner wall of the air bag is provided with a rope.

Preferably, the ropes are uniformly distributed on the inner wall of the air bag in a net shape, and the ropes are fixed at opposite angles to ensure that the air bag keeps a cylindrical shape.

Preferably, the interior of the air bag is provided with an air column connecting the inner wall and the outer wall of the air bag.

Preferably, the air columns are distributed in the air bag uniformly and used for ensuring that the air bag keeps a cylindrical shape. .

Preferably, the water bag and the air bag are of an integral structure.

Preferably, the scale device further comprises an air pump and a water pump, the air pump is connected with the air bag, and the water pump is connected with the water bag.

Preferably, the water bag and the air bag are both made of rubber materials.

Preferably, the base pipe is made of a rigid plastic material.

The graduator body is changed into a central tube, a water bag and an air bag, the metal cylinder is replaced by the water bag, the water bag is arranged outside the central tube in a surrounding manner, the air bag is arranged outside the water bag in a surrounding manner, and the outer wall of the water bag is attached to the inner wall of the air bag. The volume of the invention is only 2270X 650X 530mm when in transportation, the weight is only 139.8kg, the width and the height are reduced by about 60 percent compared with the existing graduators, and the total volume is about 17.7 percent of the volume of the old product. The weight was about 8.7% of the old product. It has the following advantages:

1. the invention reduces the weight, has small volume after water discharging and is convenient to carry.

2. The invention can be assembled on site, and then water and gas are added, and has the advantages of small volume, light weight, convenient installation and the like.

3. The air bag has the function of ensuring the roundness of the water bag, so that when the compensated neutron logging instrument is calibrated, the surrounding water is uniform, and the precision of the calibration is ensured.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The reference numbers are as follows:

1. a central tube; 2. an air bag; 3. a rope; 4. a gas column; 5. a water bag.

Detailed Description

Specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, the structure of the embodiment of the invention comprises a central tube 1, a water bag 5 for containing fresh water is arranged outside the central tube 1, an air bag 2 is arranged outside the water bag 5, the outer wall of the water bag 5 is attached to the inner wall of the air bag 2, the water bag 5 and the air bag 2 can be in a split structure or an integrated structure, when in the split structure, the left end face and the right end face of the water bag 5 are connected with the air bag 2 through buckles, and the air bag 2 plays a role in ensuring the roundness of the water bag 5, so that the surrounding water is uniform when the compensated neutron logging instrument is calibrated; in the structure of the specific embodiment of the invention, the ropes 3 are arranged on the inner cylindrical surface (inner wall) of the air bag 2, the ropes 3 are uniformly distributed on the inner wall of the air bag 2 in a net shape, and the ropes 3 are fixed at opposite angles; 5 groups of air columns are axially and uniformly distributed on the inner cylindrical surface of the air bag 2, 6 air columns 4 are uniformly distributed on each group of air columns in the radial direction of the inner cylindrical surface, the air columns 4 are connected with the inner cylindrical surface (inner wall) and the outer cylindrical surface (outer wall) of the air bag 2, and the ropes 3 and the air columns 4 jointly guarantee the roundness of the air bag 2. The water bag 5 and the air bag 2 are both made of rubber materials, and the central tube 1 is made of hard plastic materials.

The air pump provided by the invention can be used for inflation and suction, and is convenient for rapidly accommodating the air bag. The water bag can use tap water in a place with tap water, and a water pump in the fitting can be used for filling water in a place without tap water but with a water source, and the two fittings have very small volumes.

When the air bag type water heater is used, the central tube 1 penetrates through a combination of the water bag 2 and the air bag 5 to ensure that a water inlet and a water outlet of the water bag 2 are positioned at the bottom, the water bag 2 is placed on a frame, then the air bag 2 is inflated to 15-20MPa, and then the water bag 2 is filled with water; and then the compensated neutron logging instrument is inserted into the central tube 1, and different scale rods are inserted beside the instrument in pairs to scale the instrument. After the calibration is finished, the instrument and the calibration rod are taken out of the central tube 1; then the air in the air bag 3 is discharged; and finally, discharging the water in the water bag 2, and arranging and placing the graduator.

The above embodiments are only specific embodiments disclosed in the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention disclosed in the present invention should be subject to the scope of the claims.