CN2507005Y - Radial multi-layer rock core holder - Google Patents

Abstract

A core holder is suitable for single-layer or multi-layer radial flow experiments in the field of petroleum geology. It is composed of two parts: a multi-layer piston gripper and a piston-type overlying pressure system. The uppermost layer and the lowermost layer of the multi-layer piston-type holder are respectively a piston-type plug and a cavity-type rock core chamber, and the middle layer is a combination of the piston-type plug and the cavity-type rock core chamber. The core overlying pressure is provided by a piston-type overlying pressure system, which is composed of a piston, a hydraulic cavity, a chassis, a pressure-bearing pillar, an upper pressure-bearing baffle, and a nut.

Description

Radial Multilayer Core Holder

The utility model relates to a rock core holder used in the field of petroleum geology, which is suitable for single-layer or multi-layer radial flow experiments.

At present, most of the holders used in core experiments are axial core holders. Although the use of this kind of holder to simulate formation experiments is representative, it is different from the actual formation situation, because the fluid in the formation The flow is mostly radial flow, and often multiple layers flow at the same time. Existing radial core holders can only be used for single-layer experiments, and the pressure index is not high, and most of them are used for gas experiments.

The purpose of this utility model is to provide a kind of rock core holder which can not only do single-layer, but also can do multi-layer rock core radial test, which is suitable for gas and liquid, and has its own overlying pressure system.

The purpose of this utility model is achieved in that:

1. A multi-layer piston gripper is designed. The uppermost layer is a piston-type plug, the lowermost layer is a cavity-type rock core chamber, and the middle layer is a combination of the piston-type plug and the cavity-type rock core chamber. When in use, the piston plug is pressed into the cavity of the rock core chamber. The diameter of the piston-type plug and the inner diameter of the cavity-type rock core chamber are designed according to the outer diameter of the core slice used in the experiment, and they are 2-3mm larger than the outer diameter of the rock core slice; the thickness of the piston-type plug and the core chamber cavity The depth of the plug is designed according to the thickness of the core slice to ensure sufficient length in the axial direction for sealing; the sealing O-ring has a rectangular cross-section and is assembled on a right-angle step around the end face of the plug. There are rubber gaskets on the end face of the plug and the bottom surface of the cavity, which can seal the end face of the core during the experiment; there are flow holes in the middle of the plug and the middle of the core, which can be used as the general injection port or the total production after being connected. The outlet can be used to simulate the wellbore, and a hole is opened on the side of the cavity near the bottom, which can be used as a layered injection port or a layered production port.

2. A piston-type overlying pressure system is designed to provide simulated overlying pressure for the multi-layer piston gripper. It consists of a piston, a hydraulic cavity, a chassis, a pressure-bearing strut, an upper pressure-bearing baffle, a support nut and a fastening nut. The area of the piston is equal to or greater than the area of the piston plug. The pressure-bearing pillar is higher than the upper surface of the hydraulic cavity with gong patterns, and the two ends of the upper pressure-bearing baffle have round holes, the center distance of which is equal to the center distance of the two pressure-bearing pillars, and the diameter is 2-3mm larger than the outer diameter of the pressure-bearing pillar . After passing through the two circular holes of the pressure-bearing baffle, the two pressure-bearing pillars are supported by the lower supporting nuts, and then pressed tightly by the upper fastening nuts.

Owing to having adopted above-mentioned scheme, the utility model has following advantage:

1. The layered design of the holder enables the user to be flexible and maneuverable when using it. It can be used for single-layer radial flow experiments or multi-layer radial contrast experiments. If it can be used with an oven, it can simulate high temperature and high pressure, and truly simulate the formation conditions.

2. The cross-section of the sealing O-ring is rectangular, matching the right-angle steps around the end face of the plug, which not only ensures reliable sealing, but also ensures easy assembly and disassembly, especially during disassembly, when the plug is taken upwards, the O-ring will slip from the steps , making it easier for the operator to remove the plug from the cavity.

3. The diameter of the piston of the overlying pressure system is designed to be the same as or larger than the diameter of the plug, so that the pressure of the liquid that pushes the piston will be consistent with or proportional to the pressure on the end face of the rock core, which is convenient Preset and control the overlying pressure.

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

Figure 1 is a general assembly view of a radial multi-layer core holder.

In Fig. 1 1. The total injection port or output port 2. The upper pressure-bearing baffle 3. Piston type plug 4. Layered output port or injection port 5. The combination of piston type plug plug and cavity type rock core chamber 6 .Cavity core chamber 7. Piston 8. Hydraulic inlet 9. Base 10. Hydraulic cavity 11. Pressure support 12. Rock core 13. Rubber gasket 14. O-ring 15. Support nut 16. Fastening nut

The uppermost layer of holder among Fig. 1 is piston type plug 3, and the lowermost layer is cavity type rock core room 6, and middle layer is the combination body 5 of piston type plug and cavity type rock core room, and the end face of piston type plug 3 and The bottom surface of the cavity of the cavity type rock core chamber 6 has a rubber gasket 13 for sealing the two ends of the rock core 12, and there are right angle steps around the end surface of the piston plug 3 for assembling an O-ring 14 with a rectangular cross section. The O-ring 14 is used to ensure the axial seal between the piston plug 3 and the cavity type rock core chamber 6, the piston plug 3 and the joint body 5 of the piston plug and the cavity type rock core chamber and the middle of the rock core 12 All have flow holes, they are connected together as the total injection port or output port 1, and there is a layered output port or injection port 4 on the side of the cavity type rock core chamber 6 near the bottom of the cavity, and the overlying pressure on the end face of the rock core 12 is determined by The piston 7 and the upper pressure-bearing baffle 2 are provided. The power of the piston 7 comes from the pressure fluid injected into the hydraulic chamber 10 from the hydraulic inlet 8. Since the upper pressure-bearing baffle 2 is heavy, it can be fastened first when dismounting. The nut 16 is screwed up to a certain position, and then the two support nuts 15 are screwed up simultaneously to lift the upper pressure-bearing baffle plate 2 .

Claims (4)

1. A radial multi-layer rock core holder is characterized in that it is composed of two parts: a multi-layer piston type holder and a piston type overlying pressure system, and the core overlying pressure is provided by the piston type overlying pressure system . 2. The gripper according to claim 1, characterized in that: the uppermost layer of the multi-layer piston gripper is a piston-type plug, the lowermost layer is a cavity-type rock core chamber, and the middle layer is a piston-type plug and a cavity-type plug. The combination of the core chamber, the piston plug and the core chamber cavity are sealed with an O-ring with a rectangular cross-section. The O-ring is installed on the right-angled steps around the end face of the piston plug. There are flow holes on the side of each core chamber close to the bottom of the cavity, and rubber gaskets are pasted on the end face of the plug and the bottom surface of the core chamber cavity. The diameter is 2-3mm larger. 3. The gripper according to claim 1, characterized in that: the piston-type overlying pressure system is composed of a piston, a hydraulic chamber, a chassis, a pressure-bearing pillar, an upper pressure-bearing baffle, and a nut, and the area of the piston is equal to or greater than Piston plug area. 4. The piston-type overlying pressure system according to claim 1 and claim 3, characterized in that: the part of the upper end surface of the pressure-bearing pillar higher than the hydraulic cavity has gong patterns, and the two ends of the upper pressure-bearing baffle are rounded. The center distance of the holes is equal to the center distance of the two pressure-bearing pillars, and the diameter is 2-3mm larger than the outer diameter of the pressure-bearing pillars. A support nut and a fastening nut are respectively arranged on the two pressure-bearing pillars.

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