CN209821028U

CN209821028U - Rock core permeability testing arrangement

Info

Publication number: CN209821028U
Application number: CN201921604849.4U
Authority: CN
Inventors: 王启任; 熊汉桥; 王化学
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2019-12-20
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a rock core permeability testing arrangement relates to petroleum engineering technical field, including the raw materials system that connects gradually, rock core holder, backpressure valve and gas measurement system, rock core holder goes out, the entry is connected with the both ends of differential pressure gauge respectively, and this gas measurement system includes air chamber and gas composition analysis appearance, and air chamber and backpressure valve exit linkage, gas composition analysis appearance are located the air chamber lateral wall, and its probe is just inside the air chamber, and the export of rock core holder still is provided with the filter screen, the utility model discloses gas flow measurement is not influenced by temperature, pressure, and it is simple, accurate to measure, has improved the test accuracy of device, in addition, is provided with the filter screen before the backpressure valve for the particle that interception rock core internal transportation shifted out can prevent backpressure valve jam, extension equipment life.

Description

Rock core permeability testing arrangement

Technical Field

The utility model relates to a petroleum engineering technical field, concretely relates to rock core permeability testing arrangement.

Background

In the process of exploration and development of oil and gas fields, the permeability is accurately measured, and the method is a geological foundation for oil and gas resource evaluation and development scheme design, so that the method has important practical significance for accurate calibration. And because liquid can receive the influence of more factors as medium test permeability, for example clay water swelling, rock pore surface absorb liquid etc. these factors can influence the accurate | of permeability measurement. In order to solve the problems, a method and a technology for measuring permeability by taking gas as a test medium are established, wherein a constant pressure method is a common method for testing the seepage flow of a rock sample by constant pressure at two ends of the rock sample, and the key point is measurement of seepage volume; moreover, the volume of the gas is influenced by pressure and temperature changes after passing through the back pressure valve, and the volume measured by a drainage method is not accurate.

SUMMERY OF THE UTILITY MODEL

In view of above technical problem, the utility model aims to provide a rock core permeability testing arrangement, this device mainly improved gas flow measurement system for flow measurement is simple, accurate.

The utility model adopts the following technical proposal:

a rock core permeability testing device comprises a raw material system, a rock core holder, a back pressure valve and a gas measuring system which are sequentially connected, wherein the peripheral side surface of the rock core holder is connected with a confining pressure pump, a rock sample is held in the rock core holder, the outlet and the inlet of the rock core holder are respectively connected with two ends of a differential pressure gauge, the differential pressure gauge is used for measuring the differential pressure of the outlet and the inlet of the rock sample, the outlet of the rock core holder is provided with a pressure gauge, the gas measuring system comprises a gas chamber and a gas component analyzer, the gas chamber is connected with the outlet of the back pressure valve, the gas component analyzer is positioned on the side wall of the gas; the outlet of the core holder is also provided with a filter screen, particles in the core can be moved due to the flowing of fluid, and the filter screen is arranged for preventing the particles carried by gas from blocking the back pressure valve.

Preferably, the raw material gas system comprises a raw material gas bottle and a piston container, the non-driving end of the piston container is respectively connected with the raw material gas bottle and the inlet of the core holder and used for pressurizing the raw material gas, and the driving end of the piston container is connected with the constant pressure pump.

Preferably, an outlet or an inlet of the core holder is connected with a vacuum extractor for vacuum-extracting the core holder system and the accessory pipelines.

Preferably, the filter screen is located between a low-pressure leading port of the differential pressure gauge and the back pressure valve, so that differential pressure of the filter screen does not influence differential pressure measurement of a core inlet and a core outlet.

The gas flow measurement principle of the device is as follows: before the test, a certain known volume of reference gas (which is different from the experimental raw material gas) is filled into the gas chamber, the gas content in the gas chamber is tested, and after the test is started, the gas content at any moment is measured. For example, the following steps are carried out: initially, a reference gas volume V1 is injected into the gas chamber, the content W1 is measured, and the total volume of the gas in the gas chamber is calculated, wherein V (0) is V1/W1; after time T, the reference gas content W2 is measured, and the total gas volume V (T) ═ V1/W2 at that time is calculated, and the newly added volume V (T) ═ V (0) ═ V1/W2-V1/W1 is calculated

Compared with the prior art, the beneficial effects of the utility model reside in that:

the gas flow measurement is not influenced by temperature and pressure, the measurement is simple and accurate, the test accuracy of the device is improved, and meanwhile, a filter screen is arranged in front of the back pressure valve and used for intercepting particles transported out in a rock core, so that the back pressure valve can be prevented from being blocked, and the service life of the device is prolonged.

Drawings

FIG. 1 is a general schematic view of the present invention;

in the figure, 1, a raw material gas cylinder; 2. a piston reservoir; 3. a core holder; 4. a constant pressure pump;

5. a confining pressure pump; 6. sampling rock; 7. a differential pressure gauge; 8. a pressure gauge; 9. a filter screen; 10. a back pressure valve;

11. vacuumizing device; 12. an air chamber; 13. a gas component analyzer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

Example (b):

the utility model provides a rock core permeability testing arrangement, includes raw materials system, rock core holder 3 and gas measurement system, and the raw materials gas system includes raw materials gas cylinder 1, piston container 2, and piston container 1's non-drive end is connected with raw materials gas cylinder 1 and 3 entrys of rock core holder respectively for to the feed gas pressure boost, the drive end and the constant pressure pump 4 of piston container 1 are connected.

The periphery of the core holder 3 is connected with a confining pressure pump 5, a rock sample 6 is held in the core holder 3, an inlet and an outlet of the core holder 3 are respectively connected with two ends of a differential pressure gauge 7, the differential pressure gauge 7 is used for measuring differential pressure of the inlet and the outlet of the rock sample 6, an outlet of the core holder 3 is sequentially connected with a pressure gauge 8, a filter screen 9 and a back pressure valve 10, and a vacuumizing device 11 is further connected between the filter screens 9 and the back pressure valve 10.

The gas measuring system comprises a gas chamber 12 and a gas component analyzer 13, the gas chamber 12 is connected with an outlet of the back pressure valve 10, the gas chamber 12 is connected with a feed pipe for injecting reference gas into the gas chamber, the gas component analyzer 13 is positioned on the peripheral side surface of the gas chamber 12, and a probe of the gas component analyzer is right aligned to the inside of the gas chamber 12 and used for analyzing gas components in the gas chamber 12.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. A rock core permeability testing device comprises a raw material system, a rock core holder, a back pressure valve and a gas measuring system which are sequentially connected, wherein an outlet and an inlet of the rock core holder are respectively connected with two ends of a differential pressure gauge, and an outlet of the rock core holder is also provided with a pressure gauge; and a filter screen is also arranged at the outlet of the core holder.

2. The core permeability testing device as claimed in claim 1, wherein the raw material system comprises a raw material gas cylinder and a piston container, the non-driving end of the piston container is connected with the raw material gas cylinder and the inlet of the core holder respectively, and the driving end of the piston container is connected with a constant pressure pump.

3. The core permeability testing device as claimed in claim 1, wherein a vacuum is connected to the outlet or inlet of the core holder.

4. The core permeability testing device as claimed in claim 1, wherein the filter screen is located between a low pressure pilot port and a back pressure valve of a differential pressure gauge.