CN206787965U - The device of carbonate content in a kind of gravimetric detemination rock - Google Patents

Abstract

The utility model discloses a device for determining carbonate content in rocks by gravimetric method, which comprises a high-precision balance, an acid storage device, a reaction cup, an exhaust pipe, a valve, a grinding plug, and a rubber plug. On the high-precision balance, the rubber stopper is plugged on the mouth of the reaction cup, the acid storage is placed on the reaction cup and there is a discharge pipe at the bottom of the acid storage, and the discharge pipe The exhaust pipe is plugged on the rubber plug respectively, the valve is installed on the discharge pipe, and the ground plug is plugged on the charging port of the acid storage. The utility model has the advantages of simple structure, small volume, convenient carrying and simple operation, and can quickly obtain the carbonate content in rocks.

Description

A device for determining carbonate content in rocks by gravimetric method

technical field

The utility model relates to an experimental device for rapidly measuring carbonate content in rocks by gravimetric method, which belongs to the technical field of core analysis and testing instruments for petroleum and mineral exploration.

Background technique

The determination of carbonate content in rocks is an essential work in petroleum geological research. Studying the carbonate content in rocks can help geologists accurately judge formation lithology and provide basic information for reservoir evaluation.

At present, there are mainly two traditional methods for determining carbonate content: volume method and pressure method. The determination principles of these two methods are to use rock and hydrochloric acid to react in a closed container, and then calculate the carbonate content according to the volume or pressure of the _CO2 gas generated by the reaction. Since both the volume method and the pressure method need to be measured in a closed container, the airtightness is strictly required, and the result is easily affected by the airtightness of the instrument. In addition, because the gas volume measured by the volume method is easily affected by various conditions such as external temperature and pressure, this measurement method has certain limitations, while the pressure method does not produce much _CO2 gas due to the reaction, and the corresponding pressure is relatively small. , the error will be relatively large when using a pressure gauge, and this method needs to establish a standard chart, the operation process is complicated, so the pressure method also has certain limitations. The utility model adopts the principle of the gravimetric method to design an instrument, which solves the shortcomings of the traditional pressure method and volume method carbonate content measuring instrument. The instrument has the advantages of simple structure, easy operation, fast analysis speed, high analysis precision, and portability.

Contents of the invention

The purpose of this utility model is to provide a device for determining the content of carbonate in rocks by gravimetric method for the above-mentioned deficiencies in the prior art, which uses excess hydrochloric acid to react with carbonate in rocks to generate CO ₂ gas, and then by measuring the weight change of the substance before and after the reaction to obtain the weight of _CO2 gas generated, and finally calculate the carbonate content according to the chemical equation of the reaction between hydrochloric acid and carbonate.

The utility model adopts the following technical solutions:

A device for determining carbonate content in rocks by gravimetric method, comprising a high-precision balance, an acid storage device, a reaction cup, an exhaust pipe, a valve, a ground plug, and a rubber stopper, and the reaction cup is placed on the high-precision balance Above, the rubber stopper is plugged on the mouth of the reaction cup, the acid storage is placed on the top of the reaction cup and there is a discharge pipe at the bottom of the acid storage, the discharge pipe is connected with the exhaust The pipes are respectively plugged on the rubber plugs, the valves are installed on the discharge pipes, and the ground plugs are plugged on the feeding port of the acid storage.

In the above, the accuracy of the high-precision balance is 0.0001g, and the high-precision balance is an electronic balance, which can reset the weight to zero.

In the above, the acid storage device is a glass container with a volume of not less than 150ml.

In the above, the cuvette is a glass container with a volume of not less than 250ml.

The utility model has the following advantages:

1. The utility model calculates the carbonate content by obtaining the escaped _CO2 gas mass. Since the mass of the gas is compared with the volume, it is not affected by the external environment, so the value is stable and reliable;

2. The device does not need to collect the generated gas during the measurement process, there is no airtight container, and there is no problem of air leakage, so the error is small and the accuracy is high;

3. The device is simple in structure and small in size, so it is very convenient to carry;

4. The device is easy to operate and can quickly obtain the carbonate content in the rock.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-high-precision balance; 2-reaction cup; 3-rubber plug; 4-exhaust pipe; 5-valve; 6-acid storage device; Tube.

detailed description

With reference to Fig. 1, a kind of gravimetric method measuring carbonate content device in the rock provided by the utility model comprises high-precision balance 1, acid storage device 6, reaction cup 2, exhaust pipe 4, valve 5, grinding mouth plug 7 , a rubber stopper 3, the reaction cup 2 is placed on the high-precision balance 1, the rubber stopper 3 is plugged on the mouth of the reaction cup 2, and the acid storage device 6 is placed on the reaction cup 2 And there is a discharge pipe 9 at the bottom of the acid storage 6, the discharge pipe 9 and the exhaust pipe 4 are respectively plugged on the rubber plug 3, and the valve 5 is installed on the discharge pipe 9 Above, the acid liquid can be controlled to flow into the reaction cup, and the ground plug 7 is plugged on the feeding port 8 of the acid storage 6, which can prevent the liquid in the acid storage from volatilizing.

The accuracy of the high-precision balance 1 is 0.0001g, and the high-precision balance is an electronic balance, which can reset the weight to zero. The acid storage 6 is a glass container with a volume of 200ml. The cuvette 2 is a glass container with a volume of 300ml.

The utility model can obtain the production amount of _CO2 gas by weighing the mass change before and after the reaction of rock and hydrochloric acid, thereby obtaining the carbonate content. The experimental operation steps of the present utility model are as follows:

1. Experimental steps:

1) Put the acid storage 6 and the cuvette 2 on the high-precision balance 1, and then set the mass of the high-precision balance 1 to zero.

2) Put a certain amount of rock powder into the cuvette 2, and weigh the mass as m ₁ .

3) Close valve 5.

4) Take excess dilute hydrochloric acid and put it into the acid storage 6. The high-precision balance 1 weighs the sum of the masses of rock powder and dilute hydrochloric acid as m ₂ .

4) Open the valve 5, dilute hydrochloric acid flows into the reaction cup 2, so that the rock and hydrochloric acid fully react.

5) After the reading of the high-precision balance 1 is stable, read the reading m ₃ of the high-precision balance 1 .

6) According to formula (1), the weight of CO ₂ generated can be obtained.

7) According to the formula (4), the carbonate content in the rock can be obtained.

2. Formula calculation

(1) Formula for calculating the mass of _CO2 produced

According to the principle of mass conservation, the sum of the mass of rock and hydrochloric acid (m ₂ ) before the reaction is equal to the sum of the mass of residual product in the reaction cup (m ₃ ) and the mass of CO ₂ generated (m _co2 ), so the mass of CO ₂ produced for:

(1)

(2) Calculation formula of carbonate content

Calcium carbonate is used to represent the carbonate content in rocks, and the chemical reaction equation between calcium carbonate and hydrochloric acid is as follows:

(2)

According to the chemical equation (2), the quality of calcium carbonate can be obtained:

(3)

Then the carbonate content in the rock can be obtained:

(4)

For the above test method of carbonate content in rock, the sample is crushed to a particle size of less than 20 mesh when sampling, and hydrochloric acid should be excessive to ensure that the carbonate in the rock is fully reacted.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, and what is described in the above-mentioned embodiments and the description is only to illustrate the principle of the utility model. Simple modifications and replacements by ordinary technicians are within the protection scope of the present utility model.

Claims (4)

1. a kind of gravimetric method measures the device of carbonate content in rock, is characterized in that, comprises high-precision balance, acid storage device, cuvette, exhaust pipe, valve, grinding mouth plug, rubber stopper, and described cuvette is placed On the high-precision balance, the rubber stopper is plugged on the mouth of the reaction cup, the acid storage device is placed on the reaction cup, and there is a discharge pipe at the bottom of the acid storage device. The pipe and the exhaust pipe are respectively plugged on the rubber plug, the valve is installed on the discharge pipe, and the ground plug is plugged on the charging port of the acid storage. 2. the device for measuring carbonate content in a kind of gravimetric method according to claim 1, is characterized in that, the precision of described high-precision balance is 0.0001g, and described high-precision balance is an electronic balance. 3. The device for determining carbonate content in rocks by gravimetric method according to claim 1, characterized in that, the acid storage device is a glass container with a volume of not less than 150ml. 4. The device for determining carbonate content in rocks by gravimetric method according to claim 1, wherein the cuvette is a glass container with a volume of not less than 250ml.