CN106501155A - Rock core gas liquid two purpose permeability test device and reservoir damage evaluation method - Google Patents

Abstract

The invention belongs to the technical field of simulation experiment devices and evaluations in oil and gas development chambers, and in particular relates to a rock core gas-liquid dual-purpose permeability testing device and a reservoir damage evaluation method. The device at least includes: a gas-drive sampling device, which includes a gas-drive inlet module and a gas-drive liquid inlet module; a visible core holder, which includes an inlet port, an outlet port, a first plug body, and a second plug body; and A gas flow meter connected to the gas outlet pipeline. In the method, the gas permeability K ₁ of the rock core and the gas permeability K ₂ of the rock core after pollution damage are respectively measured by the above-mentioned device, and then the permeability recovery rate and the permeability damage rate are calculated. The technical solution provided by the invention can simultaneously test the gas permeability and liquid flow permeability of the rock core and the recovery degree of the rock core permeability under working fluid pollution. The device has strong simulation, ingenious connection, simple structure, convenient operation, high stability and durability.

Description

Core gas-liquid dual-purpose permeability testing device and reservoir damage evaluation method

technical field

The invention belongs to the technical field of simulation experiment devices and evaluations in oil and gas development chambers, and in particular relates to a rock core gas-liquid dual-purpose permeability testing device and a reservoir damage evaluation method.

Background technique

During the development of oil and gas reservoirs, working fluids (such as drilling fluids, completion fluids, fracturing fluids, etc.) often cause damage to the reservoir, resulting in a decrease in the permeability of the reservoir, thereby affecting the increase in oil and gas production. Simulating the pollution process of the working fluid to the reservoir and evaluating the degree of damage to the reservoir permeability have certain guiding and reference significance for oil and gas production and reservoir protection.

In the past, the experimental devices for testing rock core permeability were basically gas permeability testing devices and liquid flow permeability testing devices, which were often two separate devices. For the same rock core, two sets of devices are required to test respectively. During the process of taking out and loading the rock core, on the one hand, the inevitable damage of the rock core and the change of the experimental conditions are caused, and on the other hand, the time and cost of the experiment are greatly increased. The device can respectively measure the gas permeability and liquid permeability of the same rock core in the same device, and then evaluate the permeability damage and recovery degree of the rock core.

Chinese patent application CN201110368838 discloses a coal rock core gas permeability measurement device, which is mainly composed of a high-pressure gas source module, a core holder module, a ring pressure loading module, a data metering module, and a vacuum processing module, which are connected through needle valves. The high-pressure gas source module includes a high-pressure gas cylinder, a pressure reducing valve, and a buffer container; the core holder module is a core holder; the ring pressure loading module is a hand pump; the data metering module includes a precision pressure table and precision pressure gauge, soap bubble flowmeter; the vacuum processing module is a vacuum pump. Although the device is easy to operate, has good repeatability of measurement data, small experimental error, and low cost, it is suitable for testing the gas permeability and equivalent liquid permeability of coal rock cores, but it can only complete the test of core gas permeability. Measurement. Chinese patent application 201610134362.9 discloses a new device and method for accurate measurement of gas-water two-phase effective permeability. The device includes a constant-pressure gas source, a water constant-speed micro pump, a pressure gauge, a holder cylinder, a rock core, and a steel cylinder , a rubber sleeve, a water gauge and a gas gauge, the constant pressure gas source, a pressure gauge, a holder cylinder, a rock core, a rubber sleeve, a water gauge and a gas gauge are connected in sequence. The present invention also provides a new method for accurately measuring the gas-water two-phase effective permeability, although the interference caused by the passage of the test fluid along the gap between the side surface of the rock sample and the sealing sleeve on the test result is eliminated, the measurement of the flow rate of the fluid passing through the core is more accurate Accurate, the permeability calculation results are more reliable, but it is mainly to improve the accuracy, and the application is still limited.

Contents of the invention

In order to solve the deficiencies of the prior art, the invention provides a rock core gas-liquid dual-purpose permeability testing device and a reservoir damage evaluation method. The technical solution provided by the invention can simultaneously test the gas permeability and liquid flow permeability of the rock core and the recovery degree of the rock core permeability under working fluid pollution. The device has strong simulation, ingenious connection, simple structure, convenient operation, high stability and durability.

The technical scheme provided by the present invention is as follows:

A rock core gas-liquid dual-purpose permeability testing device, at least including:

A gas drive sampling device, the gas drive sampling device includes a gas drive intake module and a gas drive liquid intake module;

Visible core holder, the visible core holder includes an inlet end and an outlet end, the inlet end is provided with a first plug body, the first plug body is provided with an air inlet pipe, and the outlet end is provided with There is a second plug body, and the second plug body is provided with an air outlet pipe, and the air-drive air intake module and the air-drive liquid intake module are respectively connected to the air intake pipes;

And a gas flowmeter communicated with the gas outlet pipeline.

The visible core holder has a transparent shell, which can observe the phenomenon of liquid flowing through the core, and intuitively reflect the process of core contamination.

specific:

The gas drive intake module includes a first gas source, a gas storage tank, and a first heating device connected in sequence, and the first heating device communicates with the intake pipe;

The gas drive liquid intake module includes a second gas source, a liquid storage tank and a second heating device connected in sequence, and the second heating device communicates with the intake pipe.

Further, the first gas source and the second gas source are the same gas source bottle; the first heating device and the second heating device are the same heater. The gas source bottle provides gas such as nitrogen or methane, which is adjusted according to the experiment.

Further, a liquid collecting bottle is arranged between the gas outlet pipeline and the gas flow meter;

A gas collection bottle is arranged at the rear end of the gas flow meter, and the gas collection bottle communicates with the visible core holder and the gas storage tank respectively.

Further, the gas drive sampling device also includes a first three-way pipeline, a second three-way pipeline, a third three-way pipeline, a fourth three-way pipeline, a fifth three-way pipeline and a sixth three-way pipeline. The gas storage tank includes an air inlet and an air outlet, and the liquid storage tank includes a liquid inlet and a liquid outlet, wherein:

The first port of the first three-way pipeline communicates with the gas source bottle, the second port of the first three-way pipeline communicates with the pressurized end of the visible core holder, and the second A third port of the three-way pipeline communicates with the air inlet and the liquid inlet respectively;

The first port of the second three-way pipeline communicates with the gas outlet, and the second port of the second three-way pipeline communicates with the first port of the third three-way pipeline;

The second port of the third three-way pipeline communicates with the upper end of the liquid storage tank, and the third port of the third three-way pipeline communicates with the first port of the fourth three-way pipeline;

The second port of the fourth three-way pipeline communicates with the liquid outlet, the third port of the fourth three-way pipeline communicates with the heater, and the heater communicates with the visible core holder the intake pipe of the holder;

The first port of the fifth three-way pipeline communicates with the gas outlet pipe of the visible core holder, the second port of the fifth three-way pipeline communicates with the liquid collection bottle, and the fifth The third port of the three-way pipeline communicates with the gas flow meter;

The first port of the sixth three-way pipeline communicates with the third port of the second three-way pipeline, and the second port of the sixth three-way pipeline communicates with the visible core holder The pressure relief end of the sixth three-way pipeline communicates with the gas collection bottle at the third port.

Further, the second port of the first three-way pipeline is communicated with a confining pressure control valve, and the confining pressure control valve is communicated with the pressurized end of the visible core holder;

The third port of the first three-way pipeline is connected with an inlet pressure control valve, and the inlet pressure control valve is respectively connected with the air inlet and the liquid inlet;

The third port of the second three-way pipeline is connected with a first pressure relief valve, and the first pressure relief valve is connected with the first port of the sixth three-way pipeline;

The second port of the sixth three-way pipeline is communicated with a second pressure relief valve, and the second pressure relief valve is communicated with the pressure relief end of the visible core holder.

Further, a first air pressure gauge is provided between the air source bottle and the first port of the first three-way pipeline;

A second air pressure gauge is arranged between the parallel inlet ports of the air storage tank and the liquid storage tank and the inlet pressure control valve;

A third air pressure gauge is provided between the confining pressure control valve and the pressurized end of the visible core holder.

Further, a first switch is provided between the air source bottle and the first air pressure gauge;

A second switch is provided between the parallel air inlets of the air storage tank and the liquid storage tank and the air inlet;

A third switch is provided between the parallel air inlets of the air storage tank and the liquid storage tank and the liquid inlet;

A fourth switch is provided between the air outlet and the first port of the second three-way pipeline;

A fifth switch is arranged on the pipeline connecting the upper end of the liquid storage tank and the second port of the third three-way pipeline;

A sixth switch is provided between the liquid outlet and the second port of the fourth three-way pipeline;

A seventh switch is provided between the third port of the fifth three-way pipeline and the gas flow meter;

An eighth switch is directly arranged at the second port of the fifth three-way pipeline and the liquid collection bottle;

A ninth switch is provided between the third port of the third three-way line and the first port of the fourth three-way line.

It should be noted that, for the above-mentioned three-way pipelines, for the convenience of description, the port on the side close to the gas source is described as the first port, the port on the side away from the gas source is described as the third port, and the first port Ports between the first port and the third port are described as second ports.

The present invention also provides a reservoir damage evaluation method, comprising the following steps:

1) carry out the mensuration of gas permeability to rock core with the described rock core gas-liquid dual-purpose permeability testing device of claim 7 or 8, and calculate the gas permeability of rock core, be denoted as K ₁ ;

2) Carry out pollution damage to the rock core with the method for testing the liquid permeability of the rock core with the rock core gas-liquid dual-purpose permeability testing device described in claim 7 or 8;

3) carry out the measurement of gas permeability to the rock core after step 2) pollution damage with the rock core gas-liquid dual-purpose permeability testing device described in claim 7 or 8, and calculate the gas permeability of rock core, be denoted as K ₂ ;

4) Calculate K ₂ /K ₁ ×100% to obtain the core permeability recovery rate; calculate (1-K ₂ /K ₁ )×100% to obtain the permeability damage rate.

Concrete, the measuring method of the gas permeability of rock core comprises the following steps:

1) Close all switches, confining pressure control valves, inlet pressure control valves and pressure relief valves;

2) Put the rock core in the visible rock core holder, insert the first plug body and the second plug body to fix the rock core;

3) Turn on the first switch to provide air pressure;

4) Adjust the confining pressure control valve to apply confining pressure to the rock core;

5) Adjust the inlet pressure control valve to a fixed pressure, open the second switch, the fourth switch, the ninth switch and the seventh switch, let the experimental gas pass through the rock core, and adjust the heater to set the experimental temperature;

6) The inlet pressure value is read by the second pressure gauge 5, the outlet pressure is atmospheric pressure, the outlet gas flow value is read by the gas flow meter, the length and cross-sectional area of the rock core are measured, and the modified Darcy formula suitable for the gas permeability test is obtained. Calculate the gas permeability of the core.

Specifically, the measuring method of the liquid permeability of rock core comprises the following steps:

1) Close all switches, confining pressure control valves, inlet pressure control valves and pressure relief valves;

2) Put the liquid to be tested into the liquid storage tank, put the rock core into the visible rock core holder, insert the first plug body and the second plug body to fix the rock core;

3) Turn on the first switch to provide air pressure;

4) Adjust the confining pressure control valve to apply confining pressure to the rock core;

5) Adjust the inlet pressure control valve to a fixed pressure, open the third switch, the sixth switch and the eighth switch, let the gas displace the liquid to be tested to pass through the rock core, and adjust the heater to set the experimental temperature;

6) The inlet pressure value is read by the second pressure gauge 5, the outlet pressure is atmospheric pressure, the outlet liquid flow rate is calculated by timing and the liquid volume in the liquid collection bottle, the length and cross-sectional area of the rock core are measured, and it is calculated by the Darcy seepage formula Liquid permeability of the core.

Compared with the prior art, the present invention has the following advantages:

1. Under the same device conditions, the purpose of testing the gas permeability and liquid permeability of the rock core can be realized. The operation is simple, the experiment time is saved, and the core damage caused by the separate testing of the two sets of instruments is avoided.

2. The core holder in this device is visible, and the phenomenon of liquid flowing through the core can be observed, which directly reflects the process of the core being polluted.

3. It has a heating constant temperature device, which can realize the test of liquid or gas permeability under specific temperature conditions.

4. The experimental gas is nitrogen, which can be discharged into the air. If it is an unfriendly gas such as methane, the experimental gas can be collected by a gas collector.

Description of drawings

Fig. 1 is a schematic structural view of a rock core gas-liquid dual-purpose permeability testing device provided by the present invention.

In accompanying drawing 1, the structural list represented by each label is as follows:

1. Air source bottle, 2. First switch, 3. First air pressure gauge, 4. Inlet pressure control valve, 5. Second air pressure gauge, 6. Second switch, 7. Air storage tank, 8. Fourth switch , 9, the third switch, 10, the liquid storage tank, 11, the sixth switch, 12, the visible core holder, 13, the first plug body, 14, the second plug body, 15, the rock core, 16, the confining pressure Control valve, 17, first three-way pipeline, 18, third air pressure gauge, 19, seventh switch, 20, eighth switch, 21, liquid collection bottle, 22, gas flow meter, 23, gas collection bottle, 24 , heater, 25, the first pressure relief valve, 26, the fifth switch, 27, the ninth switch, 28, the second pressure relief valve.

detailed description

The principles and features of the present invention are described below, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

In a specific embodiment, as shown in Figure 1, a rock core gas-liquid dual-purpose permeability testing device includes a gas drive sampling device, a visible rock core holder 12, a liquid collection bottle 21, a gas flow meter 22 and Gas collection bottle 23. The visible core holder 12 includes an inlet end and an outlet end, the inlet end is provided with a first plug body 13, the first plug body 13 is provided with an air inlet pipe, the outlet end is provided with a second plug body 14, and the second plug body 14 An outlet pipe is provided. A rock core 15 is arranged in the visible rock core holder 12 .

The air-driven sampling device includes a gas source bottle 1, a first switch 2, a first air pressure gauge 3, a first three-way pipeline 17, an inlet pressure control valve 4, a second air pressure gauge 5, a second switch 6, and an air storage tank 7. Fourth switch 8, third switch 9, liquid storage tank 10, sixth switch 11, second three-way pipeline, third three-way pipeline, fourth three-way pipeline, heater 24, fifth switch 26 and the ninth switch 27.

The gas source bottle 1, the first switch 2, the first air gauge 3, the first three-way pipeline 17 and the inlet pressure control valve 4 are arranged in sequence. The inlet pressure control valve 4 communicates with a second switch 6 and a third switch 9 respectively. The second switch 6 communicates with the gas storage tank 7 , the gas storage tank 7 communicates with the fourth switch 8 , and the fourth switch 8 communicates with the first port of the second three-way pipeline.

The third switch 9 communicates with the liquid storage tank 10 , the liquid storage tank 10 communicates with the sixth switch 11 , and the sixth switch 11 communicates with the second port of the fourth three-way pipeline.

In addition, the upper end of the liquid storage tank 10 is connected to the fifth switch 26, and the fifth switch 26 is connected to the second port of the third three-way pipeline.

The second port of the second three-way valve, the first port of the third three-way valve, the third port of the third three-way valve, the third port of the fourth three-way valve, the heater 24 and the inlet pipeline in turn connected.

The inlet pipeline communicates with the first port of the fifth three-way pipeline, the second port of the fifth three-way pipeline communicates with the eighth switch 20 , and the eighth switch 20 communicates with the liquid collection bottle 21 . The third port of the fifth three-way pipeline is connected to the seventh switch 19 , and the seventh switch 19 is connected to the gas flow meter 22 . The gas flow meter 22 is connected to the gas collection bottle 23, and the gas collection bottle 23 is connected to the third port of the sixth three-way pipeline. The second port of the sixth three-way pipeline communicates with the second pressure relief valve 28 , and the second pressure relief valve 28 communicates with the pressure relief end of the visible core holder 12 . The first port of the sixth three-way pipeline communicates with the first pressure relief valve 25, and the first pressure relief valve 25 communicates with the third port of the second three-way pipeline. A ninth switch 27 is arranged between the third port of the third three-way pipeline and the first port of the fourth three-way pipeline.

A first air pressure gauge 3 is arranged between the first switch and the first three-way pipeline 17 . A second air pressure gauge 5 is arranged after the inlet pressure control valve 4 . The second port of the first three-way pipeline 17 is connected to the confining pressure control valve 16, and a third air pressure gauge 18 is provided between the confining pressure control valve 16 and the pressurized end of the visible core holder 12.

In the above device

Gas source bottle 1 can be gas such as nitrogen or methane, depending on the needs of the experiment;

The first switch 2 controls the air source switch;

The first air pressure gauge 3 shows the air source pressure;

The inlet pressure control valve 4 controls the pressure entering the gas storage tank 7 and the liquid storage tank 10;

The second air gauge 5 shows the pressure entering the air storage tank 7 and the liquid storage tank 10;

The second switch 6 is installed on the pipeline between the inlet pressure control valve 4 and the gas storage tank 7 to control the pressure of the gas storage tank 7;

The gas storage tank 7, the gas inside is the gas in the gas source 1;

The fourth switch 8 is installed on the pipeline between the gas storage tank 7 and the first plug body 13 of the holder to control the inlet pressure of the gas storage tank;

The third switch 9 is installed on the pipeline between the inlet pressure control valve 4 and the liquid storage tank 10 to control the pressure of the liquid storage tank 10;

Fluid storage tank 10, built-in experimental liquid to be tested, such as clear water, drilling fluid, etc.;

The sixth switch 11 is installed on the pipeline between the gas storage tank 10 and the first plug body 13 of the holder to control the gas inlet pressure of the liquid storage tank;

Visible core holder 12, the holder is composed of a rigid shell and an internal air bag, the gas can enter the closed space between the rigid shell and the air bag by controlling the confining pressure valve 16, thereby exerting confining pressure to clamp the core, this clamp The holder is made of transparent material;

The first plug body 13 and the second plug body 14, the first plug body 13 and the second plug body are respectively at both ends of the holder 12, and can be inserted into the holder to fix the rock core;

The rock core 15 is contained in the holder and is a natural rock core or an artificial rock core;

The confining pressure control valve 16 is used to adjust the peripheral pressure of the rock core by adjusting the confining pressure control valve;

The first three-way pipeline 17 is respectively connected with the gas source steel cylinder 1, the gas storage tank 7/liquid storage tank 10, and the holder 12, and the gas is provided by the gas source steel cylinder through the inlet pressure control valve 4 and the confining pressure control valve 18 To adjust the output pressure;

The third barometer 18 shows the size of the confining pressure of the rock core;

The seventh switch 19 is installed on the pipeline between the second plug body 14 and the gas flow meter 22;

The eighth switch 20 is installed on the liquid outlet pipeline of the second plug body to control the liquid outflow;

The liquid collection bottle 21 collects the liquid flowing out, and the volume of the liquid can be read out;

Gas flow meter 22, which can read the flow rate when the gas passes through;

The gas collector 23 can collect the gas passing through the gas flow meter and the gas in the gas storage tank;

The heater 24 is installed on the pipeline connected to the first plug body to heat the gas/liquid entering the holder, and can display the temperature value;

The first pressure relief valve 25 is used to release the pressure in the gas storage tank 7 and the liquid storage tank 10;

The fifth switch 26 is installed on the pipeline connecting the mouth of the liquid storage tank 10 and the first plug body;

The ninth switch device 27 is on the pipeline connecting the switch 26 and the switch 11;

The second pressure relief valve 28 is used to release the confining pressure of the holder.

The above components are connected by metal pipelines.

Example

Gas permeability test method and steps:

1 Ensure that all switches, control valves and pressure relief valves are closed before the experiment starts.

2. Put the core in the visible core holder 12, insert the first plug body 13 and the second plug body 14 to fix it.

3. Turn on the first switch 2 to provide air pressure.

4. Adjust the confining pressure control valve 16 to apply a certain confining pressure to the rock core.

5 Adjust the inlet pressure control valve 4 to a fixed pressure, open the gas storage tank switch 6, the fourth switch 8, the ninth switch 27 and the seventh switch 19, and let the experimental gas pass through the rock core. Adjust the heater 24 to set the experimental temperature.

6. The inlet pressure value is read by the second barometer 5, and the outlet gas flow value is read by the gas flow meter 22. The outlet pressure is atmospheric pressure, and the length and cross-sectional area of the rock core can be measured, so that the rock core can be calculated by the modified formula of Darcy's law. gas permeability.

7 After the experiment is completed, close the first switch 2, the second switch 6, the seventh switch 19, the ninth switch 27, the inlet pressure control valve 4 and the confining pressure control valve 16. Open the pressure relief valve 25 to discharge the gas in the gas storage tank 7, then close the fourth switch 8 and the pressure relief valve 25, and open the pressure relief valve 28 to release the confining pressure on the holder 12.

Liquid permeability test method and steps:

1 Ensure that all switches, control valves and pressure relief valves are closed before the experiment starts.

2. Put the liquid to be tested into the liquid storage tank 10; put the core into the visible core holder 12, insert the first plug body 13 and the second plug body 14 to fix it.

3. Turn on the first switch 2 to provide air pressure.

4. Adjust the confining pressure control valve 16 to apply a certain confining pressure to the rock core.

5. Adjust the inlet pressure control valve 4 to a fixed pressure, open the third switch 9, the sixth switch 11 and the eighth switch 20, and let the gas displace the liquid to be tested to pass through the core. Adjust the heater 24 to set the experimental temperature.

6. The inlet pressure value is read by the second barometer 5, the outlet liquid flow rate is calculated by timing and the liquid volume in the liquid collection bottle 21, the outlet pressure is atmospheric pressure, and the length and cross-sectional area of the rock core can be measured, so it can be calculated by the Darcy seepage formula The fluid permeability of the core.

7 After the experiment is completed, close the first switch 2, the third switch 9, the sixth switch 11, the switch 20, the inlet pressure control valve 4 and the confining pressure control valve 16. Open the pressure relief valve 25 and the fifth switch 26 to discharge the gas in the liquid storage tank 10, then close the fifth switch 26 and the pressure relief valve 25, and open the pressure relief valve 28 to release the confining pressure in the holder 12. Finally pour out the remaining liquid to be tested in the liquid storage tank.

Core permeability damage experiment:

1 Measure the gas permeability K1 of the core.

2. Contaminate and damage the core with the liquid to be tested by testing the permeability of the core liquid.

3 Measure the gas permeability K2 of the core again.

4 The permeability recovery rate of the core is K ₂ /K ₁ ×100%, and the permeability damage rate is (1-K ₂ /K ₁ )×100%.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. a kind of rock core gas liquid two purpose permeability test device, it is characterised in that at least include：

Gas drive sampling device, the gas drive sampling device include gas drive air inlet module and gas drive feed liquor module；

Visual core holding unit (12), described visual core holding unit (12) include that entrance point and the port of export, the entrance point set The first cock body (13) is equipped with, the first cock body (13) are provided with admission line, and the port of export is provided with the second cock body (14), Second cock body (14) are provided with outlet pipe, and the gas drive air inlet module and the gas drive feed liquor module are respectively communicated with described Admission line；

And the gas flowmeter (22) connected with the outlet pipe.

2. rock core gas liquid two purpose permeability test device according to claim 1, it is characterised in that：

The gas drive air inlet module includes the first source of the gas, air accumulator (7) and the first heater being sequentially communicated, and described first adds Thermal connects the admission line；

The gas drive feed liquor module includes the second source of the gas, fluid reservoir (10) and the secondary heating mechanism being sequentially communicated, described second Heater connects the admission line.

3. rock core gas liquid two purpose permeability test device according to claim 2, it is characterised in that：First source of the gas with Second source of the gas is same gas source bottle (1)；The first heater is same heater with the secondary heating mechanism (24).

4. rock core gas liquid two purpose permeability test device according to claim 3, it is characterised in that：

Liquid-collecting bottle (21) is provided between the outlet pipe and the gas flowmeter (22)；

Gas flowmeter (22) are also connected with gas collection bottle (23), and gas collection bottle (23) are also respectively communicated with described Visual core holding unit (12) and the air accumulator (7).

5. rock core gas liquid two purpose permeability test device according to claim 4, it is characterised in that：The gas drive sample introduction dress Put With the 6th triplate line, described air accumulator (7) include that air inlet and gas outlet, described fluid reservoir (10) include inlet and go out liquid Mouthful, wherein：

The a port of the first triplate line (17) connects gas source bottle (1), the first triplate line (17) Second port connects the live end of visual core holding unit (12), the 3rd port of the first triplate line (17) The air inlet and the inlet is respectively communicated with,；

The a port of second triplate line connects the gas outlet, and second port of second triplate line connects Lead to a port of the 3rd triplate line；

Second port of the 3rd triplate line connects the upper end of fluid reservoir (10), and the of the 3rd triplate line Three ports connect a port of the 4th triplate line；

Second port of the 4th triplate line connects the liquid outlet, and the 3rd port of the 4th triplate line connects Lead to heater (24), described heater (24) connect the admission line of visual core holding unit (12)；

The outlet pipe of a port connection visual core holding unit (12) of the 5th triplate line, the described 5th Second port of triplate line connects liquid-collecting bottle (21), and the 3rd port of the 5th triplate line connects the gas Flowmeter body (22)；

The a port of the 6th triplate line connects the 3rd port of second triplate line, the 6th threeway Second port of pipeline connects the pressure side of unloading of visual core holding unit (12), the 3rd end of the 6th triplate line Mouth connects gas collection bottle (23).

6. rock core gas liquid two purpose permeability test device according to claim 5, it is characterised in that：

Second port of the first triplate line (17) is communicated with confined pressure control valve (16), and described confined pressure control valve (16) connect Lead to the live end of visual core holding unit (12)；

3rd port of the first triplate line (17) is communicated with inlet-pressure force control valve (4), the inlet pressure control Valve (4) is respectively communicated with the air inlet and the inlet；

3rd port of second triplate line is communicated with the first relief valve (25), and described first relief valve (25) connect institute State a port of the 6th triplate line；

Second port of the 6th triplate line is communicated with the second relief valve (28), and described second relief valve (28) connect institute That states visual core holding unit (12) unloads pressure side.

7. rock core gas liquid two purpose permeability test device according to claim 6, it is characterised in that：

The first air gauge (3) is provided between a port of the gas source bottle (1) and first triplate line (17)；

Between the inlet end of the parallel connection of the air accumulator (7) and the fluid reservoir (10) and inlet-pressure force control valve (4) It is provided with the second air gauge (5)；

The 3rd air gauge is provided between the live end of the confined pressure control valve (16) and the visual core holding unit (12) (18).

8. rock core gas liquid two purpose permeability test device according to claim 7, it is characterised in that：

First switch (2) is provided between the gas source bottle (1) and first air gauge (3)；

Second is provided between the inlet end and the air inlet of the parallel connection of the air accumulator (7) and the fluid reservoir (10) to open Close (6)；

The 3rd is provided between the inlet end and the inlet of the parallel connection of the air accumulator (7) and the fluid reservoir (10) to open Close (9)；

The 4th switch (8) is provided between a port of the gas outlet and second triplate line；

The is provided with the pipeline of second port of the upper end and the 3rd triplate line for connecting fluid reservoir (10) Five switches (26)；

The 6th switch (11) is provided between second port of the liquid outlet and the 4th triplate line；

The 7th switch (19) is provided between the 3rd port of the 5th triplate line and the gas flowmeter (22)；

The 8th switch (20) is provided directly with second port of the 5th triplate line and the liquid-collecting bottle (21)；

Is provided between the 3rd port of the 3rd triplate line and a port of the 4th triplate line Nine switches (27).

9. a kind of reservoir damage evaluation method, it is characterised in that comprise the following steps：

1) measure of gas permeability is carried out to rock core with the rock core gas liquid two purpose permeability test device described in claim 8, And the gas permeability of rock core is calculated, it is designated as K₁；

2) in the method for the Test Liquid Permeability of Core of the rock core gas liquid two purpose permeability test device testing rock core described in claim 8 Pollution damage is carried out to rock core；

3) with the rock core gas liquid two purpose permeability test device described in claim 8 to step 2) rock core after pollution damage carries out The measure of gas permeability, and the gas permeability of rock core is calculated, it is designated as K₂；

4) K is calculated₂/K₁× 100%, obtain the resume permeability rate of rock core；Calculate (1-K₂/K₁) × 100%, obtains permeability wound Evil rate.

10. reservoir damage evaluation method according to claim 9, it is characterised in that：

The assay method of the gas permeability of rock core is comprised the following steps：

1) each switch, confined pressure control valve (16), inlet-pressure force control valve (4) and each relief valve are closed；

2) load rock core in visual core holding unit (12), filling in the first cock body (13) and the second cock body (14) is carried out to rock core Fixed；

3) first switch (2) is opened, there is provided air pressure；

4) confined pressure control valve (16) is adjusted, applies confined pressure to rock core；

5) inlet-pressure force control valve (4) is adjusted to fixation pressure, open second switch (6), the 4th switch (8), the 9th switch (27) and the 7th switch (19), allow experimental gas by rock core, adjust heater (24) and set experimental temperature；

6) inlet pressure numerical value is read by second pressure table 5, and outlet pressure is atmospheric pressure, and exit gas flow number is by gas Flowmeter (22) reads, and the length of rock core and sectional area measurement are obtained, public by the correction darcy for being suitable for measuring gas permebility Formula calculates the gas permeability of rock core；

The assay method of the Test Liquid Permeability of Core of rock core is comprised the following steps：

1) each switch, confined pressure control valve (16), inlet-pressure force control valve (4) and each relief valve are closed；

2) testing liquid is loaded fluid reservoir (10), loads rock core in visual core holding unit (12), fill in the first cock body (13) and the second cock body (14) is fixed to rock core；

3) first switch (2) is opened, there is provided air pressure；

4) confined pressure control valve (16) is adjusted, confined pressure is applied to rock core；

5) inlet-pressure force control valve (4) is adjusted to fixation pressure, open the 3rd switch (9), the 6th switch (11) and the 8th switch (20) gas displacement prepare liquid, is allowed by rock core, adjust heater (24) and set experimental temperature；

6) inlet pressure numerical value is read by second pressure table 5, and outlet pressure is atmospheric pressure, liquid flow exit by timing and In liquid-collecting bottle (21), liquid volume is calculated and is obtained, and the length of rock core and sectional area measurement are obtained, and are calculated by darcy flow formula Go out the Test Liquid Permeability of Core of rock core.