CN202805378U - Artificial core pressing device - Google Patents

Abstract

The utility model provides an artificial rock core pressing device, which comprises an airtight container and a pressurizing pump. The airtight container is composed of a cylindrical body with an open end and a top cover installed on the opening. The cylindrical body has a peripheral A flexible isolation membrane sealed with the inner peripheral wall of the cylinder, the flexible isolation membrane divides the inner part of the cylinder into a core cavity and a pressurized cavity, the core cavity communicates with the opening, and the pressurized cavity is connected to the pressurized cavity through a pipeline The outlet of the pressure pump is connected. The utility model adopts a pressurizing pump to replace the pressurizing machine in the prior art. On the one hand, the outlet pressure of the pump reaches a high pressure of more than 30 MPa, which is relatively easy to realize, so that the suppression of the artificial rock core with a large area can be realized; on the other hand, by The liquid or gas medium exerts pressure on the surface of the flexible isolation membrane, the pressure is uniform, and the compactness, porosity and permeability of the core are relatively uniform, which can meet the requirements of the laboratory.

Description

Artificial core pressing device

technical field

The utility model relates to artificial rock core technology, in particular to an artificial rock core pressing device.

Background technique

At present, petroleum, mineral, and geological research experiments require a large number of cores, but the number of real cores taken from the ground is extremely rare and very expensive; because the porosity and permeability of artificial cores can be controlled, artificial cores are often used instead of underground cores for various experiments At present, the artificial rock core is usually pressed by forming molds and presses, and the specific method is as follows: first, the artificial rock core particles containing cement are poured into the core mold and spread flat, and then a hard plate such as a thick steel plate is placed on its surface, The machine pressurizes the hard plate to compress and consolidate the artificial core particles into shape.

But there are the following problems in pressing the artificial rock core with current molding dies and presses:

It can only be used to press smaller rock cores, because the pressing of rock cores with a larger surface area requires a press with a huge tonnage. For example, an artificial core with a length and width of 50 cm needs 7,500 tons of pressure to be formed under a pressure of 30 MPa. The compression molding of large cores is currently not possible due to the limitation of the parameters of the press;

Existing rock core preparation devices use hard plates such as thick steel plates and cores to be directly pressurized to form the core in the forming mold. However, artificial core particles are often difficult to spread completely horizontally in the forming mold, and even if spread horizontally, the compactness of each place is low. The difference is that the pressure distribution of the hard plate on the core surface is uneven, resulting in uneven compactness, porosity, and permeability of the pressed core, which cannot meet the homogeneity requirements of the experimental core.

Utility model content

The utility model provides an artificial rock core pressing device, which is used to overcome the defects in the prior art, realize the pressing of a large rock core, improve the pressure balance on the surface of the rock core, and meet the experimental requirements.

The artificial rock core pressing device provided by the utility model comprises an airtight container and a pressurizing pump. The airtight container is composed of a cylinder with an open end and a top cover installed on the opening. The cylinder has a peripheral edge and a The flexible isolation membrane sealed on the inner peripheral wall of the cylinder, the flexible isolation membrane divides the inner part of the cylinder into a core cavity and a pressurized cavity, the core cavity communicates with the opening, and the pressurized cavity is connected to the pressurized cavity through a pipeline. The outlet of the pump is connected.

Wherein, the wall of the core cavity is provided with at least one drainage hole connecting the core cavity with the outside world.

Further, a counterbore is provided near the inner peripheral wall of the cylinder in the outer drainage hole, and an intercepting net is provided in the counterbore.

In particular, the inner peripheral wall of a section of the cylinder close to the pressurized chamber is straight cylindrical, and the isolation film is in contact with the inner peripheral wall of the straight cylindrical cylinder, and the inner peripheral wall of a section of cylinder close to the core cavity is trumpet-shaped, and the The opening of the cross-section of the cylinder gradually increases.

Wherein, the inner peripheral wall of the straight cylindrical cylinder is parallel to the central line of the cylinder, and the inner peripheral wall of the trumpet-shaped cylinder intersects the central line of the cylinder with an included angle between 1 degree and 45 degrees.

Further, the peripheral edge of the flexible isolation membrane has an upright flange and the flexible isolation membrane together form a cap shape, and the outer wall of the flange is in contact with the inner peripheral wall of the cylinder.

Wherein, at least one expansion ring is provided on the flange, and the expansion ring is in contact with the inner wall of the flange, and a notch for expansion is provided on the expansion ring.

Wherein, the outer wall of the flange and the inner peripheral wall of the cylinder are sealed by an adhesive.

Wherein, the end of the cylindrical body away from the top cover has a bottom cover, and the bottom cover has a vent hole, and the vent hole is connected to the outlet of the pressurizing pump through a pipeline.

Further, a sealing ring is provided between the bottom cover and the cylinder wall.

The artificial rock core pressing device provided by the utility model firstly adds artificial rock core particles into the core cavity through the opening on the cylinder, seals the top cover, and then passes the gas medium or liquid medium into the pressure cavity through the pressure pump to push the flexible isolation. The membrane moves to the core cavity and compresses the artificial core particles, and the artificial core is pressed into shape, and finally the top cover is removed to take out the pressed artificial core; a booster pump is used to replace the pressurizer in the prior art. On the one hand, the outlet of the pump It is relatively easy to achieve a pressure of 30 MPa, which enables the compression of a large artificial core; on the other hand, the pressure is applied to the surface of the flexible isolation membrane through a liquid or gas medium, and the pressure is uniform, and the core compactness, porosity, and permeability are improved. It is relatively uniform and can meet the requirements of laboratory use.

Description of drawings

Fig. 1 is the sectional view of the artificial rock core pressing device that the utility model embodiment provides;

Fig. 2 is a cross-sectional view of the expansion ring provided by the embodiment of the present invention.

Detailed ways

As shown in Figure 1, the artificial rock core pressing device provided by the embodiment of the utility model includes a closed container and a booster pump 3, the closed container is made of a cylinder 1 with an open end and a top cover 6 installed on the opening, The cylinder body 1 has a flexible isolation membrane 2 whose peripheral edge is sealed with the inner peripheral wall of the cylinder body 1. The flexible isolation membrane 2 divides the cylinder body into a core cavity 5 and a pressurized cavity 4. The core cavity 5 communicates with the opening for pressurization. The chamber 4 communicates with the outlet of the booster pump 3 through a pipe 14 .

The artificial rock core pressing device provided by the utility model firstly opens the top cover 6 of the airtight container, and fills the rock core cavity 5 with the artificial rock core particles still having cement through the opening on the cylinder body 1 and spreads them horizontally. cover the top cover 6, fix the top cover 6 and the cylinder body 1 through a plurality of bolts 12, and the pressurization pump 3 injects high-pressure fluid into the pressurization chamber 4 through the pipeline 14. Since the pressurization chamber 4 is airtight, as With the continuous injection of fluid, the pressure in the pressurization chamber 4 is continuously increased to the set value. Assuming that the set pressure value is 30Mpa, keep the pressure for a period of time, such as 10 hours, and wait for the rock core to consolidate and form; The pressure generated by the high-pressure fluid is equal at each point, thereby ensuring that the pressure at each position on the surface of the core above the flexible isolation membrane is equal, and the compression degree of the pressed artificial core is the same, and the compactness, porosity, and permeability are evenly distributed. This device uses the pressurized pump 3 to inject the high-pressure fluid into the pressurized chamber 4 to generate pressure, replacing a high-power press, and the pressurized pump with an outlet pressure of more than 30MPa is relatively easy to implement, making it possible to suppress large-scale artificial rock cores, and greatly The cost of pressing the core is reduced; the hydraulic pressure on the surface of the flexible isolation membrane in the pressurized chamber is equal, and the flexible isolation membrane is a non-rigid material. When the artificial core particles are spread unevenly, the compactness and porosity of the artificial core can be guaranteed The degree and permeability are evenly distributed.

In order to better control the pressing quality of the artificial core, at least one outlet hole 9 connecting the core cavity 5 with the outside is provided on the wall of the core cavity 5 . The outer discharge holes 9 are used to discharge the gas and liquid extruded during the core pressing process, so as to improve the pressing quality of the artificial core.

In order to prevent artificial core particles from leaking out from the outer discharge hole 9 during the pressing process, a counterbore 10 is provided near the inner peripheral wall of the cylinder, and an intercepting net 11 is arranged in the counterbore 10 .

As a preferred implementation of the above embodiment, the inner peripheral wall of a section of the cylinder close to the pressurized chamber is straight cylindrical, the isolation membrane is in contact with the inner peripheral wall of the straight cylindrical cylinder and moves slightly on the inner peripheral wall of the straight cylindrical cylinder, and the section of the cylindrical cylinder close to the core cavity The peripheral wall inside the body is trumpet-shaped, and the cross-sectional opening of the cylinder gradually increases from the inner peripheral wall of the straight cylindrical cylinder to the top cover, so as to facilitate the removal of the formed artificial core; specifically, the inner peripheral wall of the straight cylindrical cylinder is parallel to the center line of the cylinder, and the The inner peripheral wall of the cylinder intersects the centerline of the cylinder and the included angle is between 1 degree and 45 degrees.

In order to ensure the sealing performance of the pressurized chamber, the periphery of the flexible isolation membrane has an upright flanging and the flexible isolation membrane 2 together form a cap shape, and the outer wall of the flanging is in contact with the inner peripheral wall of the cylinder body 1 . The contact area with the inner peripheral wall of the cylinder is increased by flanging to increase the sealing performance of the pressurized chamber. The angle between the flanging and the flexible isolation membrane is less than 180 degrees. The flanging is elastic and can be integrated with the flexible isolation membrane or fixedly connected. The shape of the flanging and the angle between the flanging and the flexible isolation membrane can be set according to the needs. , the sealing of the pressurized cavity through the elastic deformation of the flange.

In order to further ensure the sealing performance of the pressurized chamber, at least one expansion ring 13 is provided on the flange and the expansion ring 13 is in contact with the inner wall of the flange. The expansion ring 13 is provided with a notch 15 for expansion, as shown in FIG. 2 . The outer surface of the isolation membrane flange is close to the inner peripheral wall of the cylinder, and the expansion ring is used to seal the isolation membrane flange cylinder; the expansion ring is located on the inner surface of the isolation membrane flange, and the expansion ring 13 is provided with a gap 15 for expansion, which has expansibility The expansion ring can also be used in two overlaps, and the positions of the gaps are staggered; the angle between the flange and the flexible isolation film is preferably an acute angle, so that when the expansion ring is placed, the expansion of the expansion ring can push the flange to seal with the inner peripheral wall of the cylinder touch.

Because the movement of the periphery of the flexible isolation membrane relative to the inner peripheral wall of the cylinder is very small, an adhesive can be used to seal between the flanged outer wall and the inner peripheral wall of the cylinder to increase the tightness of the pressurized chamber. The angle between the flange and the flexible isolation membrane is preferably an obtuse angle, so that the flange is compressed and deformed by its own elasticity under the limitation of the inner peripheral wall of the cylinder when placed, and can be in sealing contact with the inner peripheral wall of the cylinder through elastic force.

In order to replace or adjust the expansion ring more conveniently, the cylinder body 1 has a bottom cover 7 at the end away from the top cover 6 , and a vent hole is provided on the bottom cover 7 , and the vent hole is connected to the outlet of the pressurizing pump 3 through a pipeline 14 . In order to further ensure the tightness of the pressurized chamber, a sealing ring 8 may also be provided between the bottom cover 7 and the cylinder wall. Specifically, a groove can be dug on the cylinder wall or on the bottom cover 7, and the sealing ring 8 is clamped in the groove.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (10)

1. artificial core pressure setting, it is characterized in that, this device comprises a closed container and a force (forcing) pump, this closed container is made of the cylindrical shell of an end opening and the top cover that is installed on this opening, the flexible barrier membrane that has the sealing of a periphery and this cylindrical shell internal perisporium in the described cylindrical shell, this flexible barrier membrane is divided into rock core chamber and pressurizing chamber with described inner barrel, described rock core chamber and described open communication, and described pressurizing chamber is communicated with described pressurization delivery side of pump by pipeline.

2. artificial core pressure setting according to claim 1 is characterized in that, is provided with the outer round that at least one is communicated with rock core chamber and the external world on the wall of described rock core chamber.

3. artificial core pressure setting according to claim 2 is characterized in that, described outer round is provided with counterbore near cylindrical shell internal perisporium place, is provided with catch net in the described counterbore.

4. arbitrary described artificial core pressure setting according to claim 1-3, it is characterized in that, one section cylindrical shell internal perisporium near pressurizing chamber is straight-tube shape, described barrier film contacts with this straight-tube shape cylindrical shell internal perisporium, one section cylindrical shell internal perisporium near the rock core chamber is horn-like, and increases gradually from straight-tube shape cylindrical shell internal perisporium to top cover direction cylindrical shell cross-sectional openings.

5. artificial core pressure setting according to claim 4 is characterized in that, the cylindrical shell internal perisporium of straight-tube shape is parallel with the cylindrical shell center line, and trumpet-shaped cylindrical shell internal perisporium and cylindrical shell center line intersect and angle is spent between 45 degree 1.

6. according to claim 1,2,3 or 5 described artificial core pressure settings, it is characterized in that flange and flexible barrier membrane that the flexible barrier membrane periphery has vertically-arranged consist of the cap shape jointly, the flange outer wall contacts with the cylindrical shell internal perisporium.

7. artificial core device according to claim 6 is characterized in that, described flange is provided with at least one expansion loop and expansion loop contacts with described flange inwall, is provided with the breach for expansion on the described expansion loop.

8. artificial core device according to claim 6 is characterized in that, described flange outer wall and and the cylindrical shell internal perisporium between seal by binding agent.

9. artificial core device according to claim 6 is characterized in that, described cylindrical shell has bottom away from an end of described top cover, has passage on this bottom, and this passage connects the force (forcing) pump outlet by pipeline.

10. artificial core pressure setting according to claim 9 is characterized in that, is provided with sealing ring between described bottom and the barrel wall.

Images