CN201965077U - A rock core CT scanning fixation device - Google Patents

Abstract

The utility model provides a rock core CT scanning fixing device, which is composed of a base, a rock core rear plug, and a rock core front plug; position, and fixed on the scanning bed with fixing bolts; the base is provided with a groove for placing rock core samples, and the groove is parallel to the axial direction of the scanning bed; the stainless core rear head is vertically fixed on one end of the base, and Vertical to the groove; the base is equipped with an axial slide rail; the front head of the core is parallel to the rear head of the core, and is slidably connected with the slide rail, and can slide axially on the base; There is a push-pull fixed handle on the front head of the core; this device is convenient for taking, placing and fixing the core for CT scanning, and ensures the accurate axial positioning of multiple CT scans. It has a simple structure and is easy and fast to operate.

Description

A rock core CT scanning fixation device

technical field

The utility model relates to a CT scanning fixing device, in particular to an axial precise positioning device suitable for CT scanning of various types of rock cores.

Background technique

CT technology has developed rapidly and has been used as a routine testing technique in core analysis. It is widely used in core description, core heterogeneity determination, core sample processing program determination, fracture quantitative analysis, online saturation measurement, and flow experiment research. etc.

The basic principle of CT scanning of rocks is: the X-ray beam generated by the X-ray tube in the CT machine is irradiated from multiple directions along a selected fault layer of the object. By measuring the amount of transmitted X-rays, it is calculated after digitization. These absorption coefficients can form different digital matrices; through the digital-to-analog conversion by the high-speed computer in the machine, it can be displayed on the screen or taken as a photo, and the reconstructed image can also give each A pixel X-ray attenuation coefficient, usually expressed by CT value.

Due to the complex composition of the rock, to calculate the CT number of the rock skeleton, the CT _grain needs to know the mineral composition and composition of each fault plane of the rock, which is obviously difficult to achieve, so the commonly used CT method for measuring rock porosity usually requires two The scanning method is to scan the dry rock, then scan the rock after it is 100% saturated with liquid, and calculate the porosity of the rock sample.

Regardless of the calculation of rock porosity or fluid saturation, it is necessary to scan several different states of the core, and how to ensure that the core is in the same position (especially the axial position) in these states is also known as CT. A key indicator for scan core analysis.

At present, the commonly used positioning method is to place the core in the holder, scan the dry core and then saturate the liquid in the holder before scanning. This method is cumbersome, needs to consider the CT attenuation of the core holder and the rubber sleeve, and takes a long time, so it cannot be tested in large quantities. In addition, if it is necessary to study the damage of formation rocks, such as the changes of rocks before and after acidification, this method is not feasible.

Utility model content

The purpose of this utility model is to provide a core CT scanning positioning device that can accurately locate the core in the axial direction, so as to realize accurate and rapid CT measurement or characterization of rock porosity, fluid saturation or rock damage.

A rock core CT scanning fixing device described in the utility model is composed of a base, a rock core rear plug, and a rock core front plug; the base is placed on the scanning bed, and the position of the base is determined by the bed entry position coordinates of the CT scanning bed, and fixed with fixing bolts On the scanning bed; the base is provided with a groove for placing the core sample, and the groove is parallel to the axial direction of the scanning bed; the stainless steel core rear head is vertically fixed on one end of the base and is perpendicular to the groove; on the base An axial slide rail is provided; the front head of the core is parallel to the rear head of the rock core, and is slidably connected with the slide rail, and can slide axially on the base; There is a push-pull fixed handle.

When placing the core, first pull the push-pull fixed handle on the front head of the core, so that the front head of the core slides away from the rear head of the core, put the core into the groove, and then push the front head of the core to make the front head of the core and the rear head of the core Clamp the core and record the graduation of the axial scale. Through the coordinates of the entry position of the CT scanning bed and the positioning of the axial scale of the core sample, the scanning of the core sample in different states can be accurately positioned.

The beneficial effect of the utility model is that the design of the slidable core front head and the scale of the utility model is convenient for taking, placing and fixing the CT scan core, and ensures the accurate axial positioning of multiple CT scans. The utility model has the advantages of simple structure, convenient and fast operation.

Description of drawings

Fig. 1 is the structural representation of a kind of preferred embodiment of the utility model;

FIG. 2 is a top view of FIG. 1 .

Among them: 1. Push-pull fixed handle 2. Front head 3. Core sample 4. Base 5. Core back head 6. Scanning bed 7. Fixing bolt 8. Groove 9. Axial slide rail 10. Axial scale

Detailed ways

A rock core CT scanning fixing device described in the utility model is composed of a base 4, a rock core rear head 5, and a rock core front head 2; 4, and fixed on the scanning bed 6 with fixing bolts 7; the base 4 is provided with a groove 8 for placing the core sample 3, and the groove 8 is parallel to the axial direction of the scanning bed 6; the stainless steel core rear head 5 , fixed vertically on one end of the base 4, and perpendicular to the groove 8; the base 4 is provided with an axial slide rail 9; the front head 2 of the rock core is parallel to the rear head 5 of the rock core, and is slidably connected with the slide rail 9, and can be mounted on the base 4 for axial sliding; the base 4 is provided with an axial scale 10 indicating the position of the rock core sample, and the front head 2 of the rock core is provided with a push-pull fixed handle 1.

Claims (1)

1. A rock core CT scanning fixing device is composed of a base, a rock core rear plug, and a rock core front plug; it is characterized in that: the base is placed on the scanning bed, the position of the base is determined by the bed entry position coordinates of the CT scanning bed, and the fixing bolt is used Fixed on the scanning bed; the base is provided with a groove for placing the core sample, which is parallel to the axial direction of the scanning bed; the stainless steel core rear head is fixed vertically on one end of the base and is perpendicular to the groove; the base There is an axial slide rail on the top; the front head of the core is parallel to the back head of the rock core, and is slidably connected with the slide rail, and can slide axially on the base; the base is provided with an axial scale indicating the position of the core sample, and Features push-pull fixed handle.

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