CN209264525U - A vacuum saturation device for rock sample porosity testing - Google Patents

Abstract

The utility model relates to a vacuum saturation device for testing the porosity of rock samples, which comprises a sealed tank, a liquid storage tank, a vacuum pump and a booster pump. The liquid storage tank is connected to the bottom of the sealed tank by valve Ⅰ, and the outside of the liquid storage tank is provided with a scale line. The inlet of the booster pump is connected to the liquid storage tank through the pipeline Ⅰ, the outlet is connected to the sealed tank through the pipeline Ⅱ, and the vacuum pump is connected through the tee. The valve Ⅰ is connected with the sealing tank and the liquid storage tank respectively. The sealing tank includes a tank body and a sealing cover screwed on the top of the tank body. There is an installation groove on the top of the tank body, and a T-shaped sealing ring is installed in the installation groove. A sample rack is arranged in the airtight tank, and a vibrating rod is arranged at a position close to the sample rack on the inner wall of the tank.

Description

A vacuum saturation device for rock sample porosity testing

technical field

The utility model relates to the technical field of rock liquid saturation, in particular to a vacuum saturation device for testing the porosity of rock samples.

Background technique

As the exploitation of oil and natural gas in conventional sandstone, carbonate rock and other reservoirs is gradually reduced, unconventional oil and natural gas has become a new trend in the development of the modern petroleum industry. As an important unconventional oil and gas, tight sandstone oil and gas and shale oil and gas Energy makes the exploration and development of unconventional oil and gas. Some previous methods and industry standards are no longer applicable to the evaluation of unconventional oil and gas reservoirs. Therefore, it is of great significance to establish targeted evaluation methods suitable for unconventional oil and gas reservoirs.

Traditional vacuum saturation devices are basically only suitable for conventional cores with good porosity and permeability, and are not completely suitable for saturated liquids in tight sandstones. Because the tight sandstone has small pore throats and strong capillary force, and it is difficult to evacuate the intermediate container into a low-pressure vacuum during the vacuuming process, some gas will remain in the nanoscale pore throats. After evacuation, the saturated liquid is directly put into the sample cup, and the rock If the sample is quickly and completely submerged, the liquid will quickly enter the rock sample, and the gas in the nano-scale or poorly connected pore throat will be blocked in the core, forming the Jamin effect, causing saturation failure, and bringing errors to subsequent evaluations, and even erroneous conclusions .

In addition, the sealed tank used for the vacuum saturation device is generally made of stainless steel, and the change of the saturated liquid cannot be observed intuitively. During the sealing process of the sealing cover of the traditional airtight jar, since the sealing ring is not fixed, it will cause the misalignment of the sealing ring, which will affect the airtightness of the airtight jar and directly affect the accuracy of the test results.

Utility model content

The purpose of the utility model is to provide a vacuum saturation device for testing the porosity of rock samples, so as to solve the problem of inaccurate test results.

A kind of rock sample porosity test of the present utility model is realized like this with vacuum saturation device:

A vacuum saturation device for rock sample porosity testing, comprising a sealed tank, a liquid storage tank, a vacuum pump and a booster pump;

The liquid storage tank is connected under the sealed tank by a valve I, and a scale line is provided on the outside of the liquid storage tank;

The inlet of the booster pump is connected to the liquid storage tank through the pipeline I, the outlet of the booster pump is connected to the sealed tank through the pipeline II, and the vacuum pump is respectively connected to the sealed tank and the liquid storage tank through the three-way valve I;

The sealed tank includes a tank body and a seal cover screwed on the top of the tank body. An installation groove is arranged on the top of the tank body, and a sealing ring with a T-shaped section is installed in the installation groove. There is a sample rack, and a vibrating rod is arranged on the inner wall of the tank close to the sample rack.

Further, the vacuum pump includes two, two of the ports of the three-way valve I are respectively connected to the liquid storage tank and the sealed tank, and the other port is connected to one of the ports of the three-way valve II;

The other two ports of the three-way valve II are respectively connected with two vacuum pumps.

Further, the bottom of the airtight tank is a funnel-shaped structure.

Further, a valve II is set at the inlet of the booster pump.

Further, the sample holder is surrounded by a plurality of vertical rods, and cross bars are arranged between adjacent vertical rods, and mesh plates are arranged between the cross rods.

Further, the terminal of the vibrating rod passes through the tank body through a sealed joint and protrudes out of the tank body.

Further, the sealing cover is provided with a barometer.

Further, a filter is connected between the sealed tank and the liquid storage tank.

Further, the filter includes a threaded cavity and an upper cover, and a gasket is provided between the cavity and the upper cover;

Through holes are respectively arranged in the center of the upper cover and the cavity, and multi-layer filter screens are movably installed in the cavity.

Further, a buffer tank is provided between the vacuum pump and the three-way valve I, the pipeline III connected to the three-way valve I extends to the bottom of the buffer tank, and the pipeline IV connected to the vacuum pump extends to the top of the buffer tank.

Beneficial effects of the present utility model: the vacuum saturation device for testing the porosity of rock samples of the present utility model is provided with a T-shaped sealing ring between the tank body and the sealing cover of the sealed tank, which can prevent the The sealing ring moves to ensure the sealing performance of the sealed tank, thereby improving the accuracy of the test results.

Further, since the liquid storage tank is arranged under the sealed tank, the saturated liquid can be sent back to the liquid storage tank after the test is completed, which is convenient for next use, and since the liquid storage tank is provided with a scale line, it can pass The change of the saturated liquid level in the front and rear liquid storage tanks provides accurate data for the test.

Furthermore, since the vibrating rod is installed in the sealed tank, it can effectively vibrate the gas in the nano-scale or poorly connected pore throats in the rock, so as to ensure the saturation effect and improve the accuracy of the test results.

Description of drawings

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

Fig. 1 is the structural diagram of the vacuum saturation device for rock sample porosity test of the utility model embodiment 1;

Fig. 2 is the cross-sectional view of the sealed tank of the vacuum saturation device for rock sample porosity testing of the utility model embodiment 1;

Figure 3 is an enlarged view of part A in Figure 2;

Fig. 4 is the structural diagram of the vacuum saturation device for rock sample porosity testing of the utility model embodiment 2;

Fig. 5 is the cross-sectional view of the filter of the vacuum saturation device for rock sample porosity testing of the utility model embodiment 2;

Fig. 6 is a structural diagram of a vacuum saturation device for testing the porosity of rock samples according to Example 3 of the present invention.

In the figure: sealed tank 1, liquid storage tank 2, vacuum pump 3, booster pump 4, valve I5, scale line 6, pipeline I7, pipeline II8, three-way valve I9, tank body 10, sealing cover 11, installation groove 12, Sealing ring 13, sample holder 14, vibrating rod 15, three-way valve II 16, valve II 17, vertical rod 18, cross rod 19, screen plate 20, terminal 21, sealing joint 22, air pressure gauge 23, filter 24, cavity 25. Upper cover 26, gasket 27, filter screen 28, support ring 29, buffer tank 30, pipeline III 31, pipeline IV 32, through hole 33.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments described above are some of the embodiments of the present utility model, but not all of them. Based on the implementation manners in the present utility model, all other implementation manners obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present utility model, all other implementation manners obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1:

As shown in FIGS. 1 to 3 , a vacuum saturation device for testing the porosity of rock samples includes a sealed tank 1 , a liquid storage tank 2 , a vacuum pump 3 and a booster pump 4 .

The liquid storage tank 2 is connected under the sealed tank 1 through the valve I5, and the outside of the liquid storage tank 2 is provided with a scale line 6. The inlet of the booster pump 4 is connected to the liquid storage tank 2 through the pipeline I7, and the outlet of the booster pump 4 is passed through The pipeline II8 is connected to the sealed tank 1, and the vacuum pump 3 is connected to the sealed tank 1 and the liquid storage tank 2 respectively through the three-way valve I9. The sealed tank 1 includes a tank body 10 and a sealing cover 11 threaded on the top of the tank body 10. The top of the tank is provided with an installation groove 12, the installation groove 12 is equipped with a T-shaped sealing ring 13, a sample holder 14 is arranged in the sealed tank 1, and a vibrating rod 15 is arranged near the sample holder 14 on the inner wall of the tank body 10.

During the test, the external environment will have a great impact on the test results, so it is necessary to place the sample in a vacuum environment for testing. In order to ensure the accuracy of the test results, when adding the saturated liquid into the sealed tank 1, it is necessary to Constantly vacuumize the sealed tank 1, and the vacuum pump 3 will burn out after a long period of uninterrupted use. In order to prevent damage to the vacuum pump 3, in this embodiment, the vacuum pump 3 includes two, three-way valve I9. Two of the interfaces are respectively connected to the liquid storage tank 2 and the sealing tank 1 , the other interface is connected to one of the interfaces of the three-way valve II16 , and the other two interfaces of the three-way valve II16 are respectively connected to the two vacuum pumps 3 .

The two vacuum pumps 3 are mutually standby, and can be used alternately to prevent damage. The setting of the three-way valve II 16 can control the alternate operation of the two vacuum pumps 3 .

The traditional vacuum saturation device only vacuumizes the sealed tank 1, and the saturated liquid also contains a small amount of air, which will also affect the test results. Therefore, in this embodiment, the vacuum pump 3 is connected to the sealed tank 1 through the three-way valve I9 at the same time. Tank 1 and liquid storage tank 2 effectively remove the air in the saturated liquid in sealed tank 1 and liquid storage tank 2, and use the three-way valve I9 to play a switching role.

After the pores of the rock are saturated, in order to facilitate the discharge of the remaining saturated liquid, the bottom of the sealed tank 1 is a funnel-shaped structure. The arrangement of the funnel-shaped structure can prevent the saturated liquid from remaining in the sealed tank 1, and make it all flow back into the liquid storage tank 2, so that it is convenient to count the amount of saturated liquid absorbed by the pores of the rock, and it is also convenient for the next use.

In order to control the connection between the booster pump 4 and the liquid storage tank 2 , a valve II17 is provided at the inlet of the booster pump 4 .

The setting of the sample rack 14 is used to place the test sample. In order to make it contact with the saturated liquid in all directions, the sample rack 14 is surrounded by a plurality of vertical rods 18, and a horizontal bar 19 is arranged between adjacent vertical rods 18. A mesh plate 20 is arranged between the rods 19 . Placing the rock sample on the mesh plate 20 can increase the contact area with the saturated liquid, thereby ensuring the saturation efficiency.

The setting of the vibrating rod 15 can vibrate the saturated liquid, so that when the saturated liquid enters the pores of the rock, the remaining air in the pores can be effectively vibrated to increase the saturation effect. In this embodiment, in order to provide driving for the vibrating rod 15, The terminal 21 of the vibrating rod 15 passes through the tank body 10 with a sealing joint 22 and protrudes out of the tank body 10 .

In order to grasp the air pressure in the airtight tank 1 conveniently, an air pressure gauge 23 is arranged on the airtight cover 11 .

When performing a vacuum saturation test, first place the rock sample on the mesh plate 20, seal the sealing cover 11, and then start the vacuum pump to vacuum the sealed tank 1. After the vacuuming is completed, the vacuum pump 3 is connected through the three-way valve I9 Liquid storage tank 2, vacuumize the liquid storage tank 2. After the liquid storage tank 2 is evacuated, switch to the state of vacuuming the sealed tank 1 again. At this time, open the valve II17, and use the booster pump 4 to continuously pump the saturated liquid. Send it into the sealed tank 1, start the vibrating rod 15 to vibrate, and vibrate the saturated liquid. After saturation, turn off the vacuum pump 3 and the booster pump 4, close the valve II17, and turn on the valve I5, the remaining saturated liquid will flow from the sealed tank 1 into the liquid storage tank 2 for the first time, according to the liquid in the front and rear liquid storage tanks 2 The change of position can be used to obtain the amount of saturated liquid absorbed by the rock, and thus the test result can be obtained.

Example 2:

When carrying out the vacuum saturation test, since the saturated liquid is sent into the sealed tank 1 through the pressurization of the booster pump 4, it may cause a certain impact on the surface of the rock, and the saturated liquid will contain a small amount of residue, which will affect The saturated liquid is used next time.

As shown in Fig. 4 and Fig. 5, on the basis of embodiment 1, a kind of vacuum saturation device for rock sample porosity test is also provided, its structure is the same as the vacuum saturation device for rock sample porosity test disclosed in embodiment 1. The devices are substantially the same, except that a filter 24 is connected between the sealed tank 1 and the liquid storage tank 2 .

Because the filter 24 is arranged between the sealed tank 1 and the liquid storage tank 2, and the sealed tank 1 and the liquid storage tank 2 all need to be in a vacuum state, so the filter 24 also has a certain sealing performance, so as to avoid affecting the test results. In this embodiment, the filter 24 includes a threaded cavity 25 and an upper cover 26, and a gasket 27 is arranged between the cavity 25 and the upper cover 26, and the centers of the upper cover 26 and the cavity 25 are respectively arranged There is a through hole 33, and a multi-layer filter screen 28 is movably installed in the cavity 25.

The sealing gasket 27 can ensure the tightness of the connection between the cavity 25 and the upper cover 26 .

Preferably, an annular support ring 29 is provided in the cavity 25 , and the filter screen 28 can be placed on the support ring 29 .

After the saturation is completed, the saturated liquid enters the liquid storage tank 2 again through the filtration of the filter screen 28, and the rock residue in the saturated liquid can be filtered out, so as to prevent the booster pump 4 and the test results from being affected during the next use.

Example 3:

During the vacuum pumping process, the vacuum pump will inevitably bring out part of the gaseous saturated liquid, and directly entering the vacuum pump 3 will cause damage to its interior. Therefore, as shown in Figure 6, a rock liquid is also provided on the basis of Example 1. The vacuum saturation device for sample porosity test is roughly the same in structure as the vacuum saturation device for rock sample porosity test disclosed in Example 1, except that a buffer tank is arranged between the vacuum pump 3 and the three-way valve I9 30. The pipeline III31 connected with the three-way valve I9 extends to the bottom of the buffer tank 30, and the pipeline IV32 connected with the vacuum pump extends to the top of the buffer tank 30.

The buffer tank 30 is also of a sealed structure. When vacuuming, the saturated liquid that is drawn out can remain in the buffer tank 30 to avoid damage to the vacuum pump 3 caused by entering it.

Inspired by the above ideal embodiment according to the utility model, through the above description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

In the description of the utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the Means that a device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the present invention, unless otherwise specified and limited, the first feature above or below the second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact. Rather, through additional characteristic contact between them. Moreover, the first feature on, above and above the second feature includes the first feature directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature being below, below and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Claims (10)

1. A vacuum saturation device for porosity testing of rock samples, comprising: a sealed tank (1), a liquid storage tank (2), a vacuum pump (3) and a booster pump (4); The liquid storage tank (2) is connected under the sealed tank (1) by a valve I (5), and a scale line (6) is provided on the outside of the liquid storage tank (2); The inlet of the booster pump (4) is connected to the liquid storage tank (2) through the pipeline I (7), and the outlet of the booster pump (4) is connected to the sealed tank (1) through the pipeline II (8); The vacuum pump (3) is connected to the sealed tank (1) and the liquid storage tank (2) respectively through a three-way valve I (9); The sealed tank (1) comprises a tank body (10) and a seal cover (11) screwed on the top of the tank body (10); the top of the tank body (10) is provided with an installation groove (12); the installation A sealing ring (13) with a T-shaped section is installed in the groove (12); A sample rack (14) is arranged inside the sealed tank (1), and a vibrating rod (15) is arranged on the inner wall of the tank body (10) close to the sample rack (14). 2. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that, the vacuum pump (3) comprises two; the two interfaces of the three-way valve I (9) are respectively It is connected with the liquid storage tank (2) and the sealing tank (1), and the other interface is connected with one of the interfaces of the three-way valve II (16); and The other two ports of the three-way valve II (16) are respectively connected with two vacuum pumps (3). 3. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that, the bottom of the sealed tank (1) is a funnel-shaped structure. 4. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that a valve II (17) is arranged at the inlet of the booster pump (4). 5. the rock sample porosity test according to claim 1 is characterized in that, described sample holder (14) is surrounded by a plurality of upright poles (18), and adjacent upright pole (18) A cross bar (19) is arranged between them; A net plate (20) is arranged between the cross bars (19). 6. The vacuum saturation device for rock sample porosity testing according to claim 1, wherein the terminal (21) of the vibrating rod (15) passes through the tank (10) using a sealing joint (22) And stretch out outside the tank body (10). 7. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that a barometer (23) is arranged on the sealing cover (11). 8. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that a filter (24) is connected between the sealed tank (1) and the liquid storage tank (2). 9. rock sample porosity test according to claim 8 is characterized in that, described filter (24) comprises the cavity (25) of threaded connection and loam cake (26), and described A gasket (27) is provided between the cavity (25) and the upper cover (26); The centers of the upper cover (26) and the cavity (25) are respectively provided with through holes (33), and multi-layer filter screens (28) are movably installed in the cavity (25). 10. The vacuum saturation device for rock sample porosity testing according to claim 1, characterized in that a buffer tank (30) is arranged between the vacuum pump (3) and the three-way valve I (9), and the The pipeline III (31) connected to the three-way valve I (9) extends to the bottom of the buffer tank (30), and the pipeline IV (32) connected to the vacuum pump (3) extends to the top of the buffer tank (30).