CN204330517U - Under High Temperature High Pressure, the test of shale gas air content gathers and measuring apparatus - Google Patents

Abstract

The utility model discloses a test collection and metering device for the gas content of shale gas under high temperature and high pressure, which comprises: a water storage tank (2), a box (1) for placing the water storage tank (2), a conduit (3), silica gel Tube (4), L-shaped bracket (5), load cell (6), hook (7), water collection bag (8), signal line (9), amplifier and A/D converter (10), computer ( 11), and a direct current power supply (12); the utility model overcomes the shortcomings of the gas content test equipment drainage method of the prior art, can carry out on-site desorption of shale gas, and provides a basis for shale gas regional evaluation and gas storage capacity The data can be measured at the same time for 30 shale gas samples, which improves the test efficiency.

Description

Shale gas gas content test collection and metering device under high temperature and high pressure

technical field

The utility model relates to the fields of petroleum and natural gas and exploration and development, in particular to a test collection and metering device for the gas content of shale gas under high temperature and high pressure.

Background technique

Shale gas is a self-generated and self-storage unconventional natural gas resource that occurs in shale. An important parameter to evaluate its enrichment degree is the gas content of shale gas. To effectively evaluate whether a certain area has the prospect of industrialization, the gas content evaluation data must be accurately tested, and these gas content data are used for reservoir evaluation, resource evaluation and production prediction. To do this, it is necessary to know the gas content of the shale, and the gas content testing equipment is the only tool to provide this data. Due to the deep burial of shale reservoirs in China and the high formation pressure, under the condition of 3%-5% porosity, the gas volume in the pores of shale gas is far greater than the gas volume adsorbed on the surface of pores, but the gas content of conventional shale gas Analytical instruments are all based on the gas content test method of coalbed methane, which does not meet the special properties of shale. Therefore, shale gas volume testing equipment is very important in exploration and development.

At present, the measurement method of shale gas gas content at home and abroad is the same on-site desorption method as the test method of coalbed methane gas content. Its theoretical basis and experimental evidence are that the release rate of gas in coal rocks during the early desorption process is proportional to the square root of time, and the gas lost during the lifting process in the wellbore can be calculated based on this, and the total gas content is the early loss. Gas plus the sum of desorbed gas and residual gas.

At present, the domestic and foreign gas content testing devices mainly include automatic gas content measuring instrument (manufactured by Terratek Company in the United States) and domestic on-site gas content measuring equipment. There are two methods for gas content collection and measurement. One is the drainage gas metering method. The operation steps are 1. Let the desorbed natural gas hold in the desorption tank for a certain time or a certain pressure; 2. Test the first sample , open the valve of the desorption tank to introduce the desorbed natural gas into the top of the water-filled graduated glass tube, push the water in the glass tube to flow out, and read the volume occupied by the gas in the glass tube after the gas is exhausted. How to close the first desorption Tank valve. The test uses a volume test tube to test the gas content of dozens of samples by inverting the tank; 3. Before testing the second sample, the glass tube should be filled with water again, and the above test steps should be repeated. One instrument is equipped with a glass tube, which requires repeated water filling-experiment-water filling, which is more suitable for the desorption of coalbed methane or shale gas whose pore pressure has dropped. However, for the test method of shale gas gas content under high pressure, due to the high pore pressure and the fast desorption speed in the early stage, it is difficult for a glass tube meter to meet the desorption test requirements. Another method is to use a gas mass flowmeter to measure the desorbed natural gas. Due to the slow desorption speed in the later stage, the accuracy of the mass flowmeter is difficult to meet the test requirements. Therefore, it is urgent to develop an experimental device for collecting and measuring gas content of shale gas under high pore pressure.

Utility model content

The purpose of this utility model is: to overcome the shortcomings of the above two methods of gas content testing equipment drainage gas, the utility model provides a shale gas gas content testing equipment under high temperature and high pressure, which can solve the following problems:

(1) Be able to carry out on-site desorption of shale gas, and provide basic data for regional evaluation of shale gas and gas storage capacity.

(2) It can measure 30 shale gas samples at the same time, which improves the test efficiency.

The technical scheme adopted by the utility model to solve the gas content test under high pressure is:

A device for testing, collecting and measuring the gas content of shale gas under high temperature and high pressure, which includes: a water storage tank (2), a water storage tank

(2) box (1), conduit (3), silicone tube (4), L-shaped bracket (5), load cell (6), hook (7), water collection bag (8), signal line (9 ), amplifier and A/D converter (10), computer (11), and DC power supply (12);

The plurality of water storage tanks (2) are arranged in the box (1), and two conduits (3) are installed on the top of the water storage tanks (2) to keep the seal between the conduits (3) and the water storage tanks (2) , the left conduit (3) is connected to the desorption tank, the lower part of the right conduit (3) is connected to the first silicone tube (4) to hang down to the bottom of the water storage tank (2), and the upper part of the right conduit (3) is connected to the first Two silica gel tubes (4) to the water collection bag (8), the water collection bag (8) is hung on the load cell (6) through the hook (7), the load cell is fixed on the L-shaped bracket (5), and the L line The bracket (5) is fixed on the top edge of the box (1), the signal line (9) of the load cell is connected to the amplifier and the A/D converter (10), and the converted signal is connected to the computer through the signal line (9). (11) is connected, and the DC power supply (12) is connected with the weighing sensor to supply power to the sensor.

Wherein, the size of the box (1) is: 80cm in length, 40cm in width, and 40cm in height; the diameter of the water storage tank (2) is 5-15cm, and the height is 10-50cm; the water storage tank (2) is made of acrylic material; The conduit (3) is a stainless steel tube; the L-shaped bracket (5) is stainless steel; the load cell (6) has a measuring range of 3Kg, DC24V power supply, and 0-10mmV output; the water collection bag (8) is plastic; a DC power supply (12) For 24V DC power supply.

According to the utility model, the new device for measuring, collecting and measuring the gas content of shale gas under high temperature and high pressure is composed of a natural gas collection and measurement system and automatic data collection. The computer acquisition and processing system includes computer processing software and data input and output; the natural gas collection and measurement system includes water storage tanks, collection bags, weighing sensors, and data A/D converters. The utility model is characterized in that the desorbed natural gas forms a slight pressure on the top of the airtight water storage tank, pushing the water into the water collection bag hung on the weighing sensor, the weight change of the water collection bag is detected by the sensor, and the sensor signal is transmitted to the A/D converter to form a numerical signal, and the numerical signal is collected by the computer. The principle of the utility model is to use the principle of material balance, the volume occupied by 1 milliliter of gas is equal to the weight of 1 gram of water, the weight of water is easy to measure, and the volume of metered gas is converted into the weight of metered water, which greatly improves the test accuracy and can realize multiple Samples are collected simultaneously and continuously.

The beneficial effects of the utility model are:

Provide a new device for collection and metering of shale gas content desorption measurement with up to 30 samples. The device adopts the principle of material balance and gravity differentiation, and cleverly converts the measurement of gas volume into the weight measurement of water, which greatly improves the test accuracy. The utility model is transported to the exploration site through the vehicle-mounted system, and the desorption experiment is carried out on the natural gas desorbed from the shale, so as to measure and study the gas content characteristics, gas content distribution rules and exploration potential capabilities in different regions.

Description of drawings

Fig. 1 is a schematic diagram of a test collection and measurement device for gas content of shale gas under high temperature and high pressure according to the present invention.

In the figure,

1-stainless steel box for placing water storage tank 2 (the size of the box is 80cm long, 40cm wide, and 40cm high, and can accommodate 10 water storage tanks in two rows);

2 - Water storage tank (diameter 15cm, acrylic material);

3 - Conduit (outer diameter 3mm, inner diameter 2mm, stainless steel tube);

4 - Silicone tube (outer diameter 4mm, inner diameter 3mm);

5-L-shaped bracket (stainless steel, length 80cm, width 5cm, height 10cm);

6 - Load cell (S-type load cell, range 3Kg, DC24V power supply, 0-10mmV output);

7 - hook;

8 - Water collection bag (capacity 1000ml, plastic material);

9 - signal line;

10 - Amplifier and A/D converter;

11 - computers and software;

12 - DC power supply (24V).

Detailed ways

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

The connection method of the new device for collecting and measuring the gas content of shale gas under high temperature and high pressure is as follows: put the water storage tank 2 into the stainless steel box 1, install two conduits 3 on the top of 2, and keep the seal between 3 and the water storage tank, left The conduit on the side is connected to the desorption tank (not included in the utility model, which belongs to mature equipment), the lower part of the conduit on the right is connected to a pipeline 4 to hang down to the bottom of the water storage tank, and the upper part of the conduit on the right is connected to a pipeline 4 to the collector. The water bag 8 and the water collection bag 8 are hung on the load cell 6 through the hook 7, the load cell is fixed on the L-shaped bracket 5, the L row bracket is fixed on the top edge of the box 1, and the signal line of the load cell is connected to On the amplifier and the A/D converter 10, the converted signal is connected to the computer 11 through the signal line 9, and the DC power supply 12 is connected to the weighing sensor to supply power to the sensor.

The working method of the new device for collecting and measuring the gas content of shale gas under high temperature and high pressure is as follows: the natural gas from the desorption tank enters the water storage tank through the conduit 3 on the left side of the top of the water storage tank. At the top of the water storage tank, a slight pressure is formed, and the high pressure drives the water of the water storage tank to flow out from the hose that hangs down to the bottom of the water storage tank through the conduit on the right side of the bottom of the water storage tank, and enters the water collection bag, the water collection bag After entering the water, the weight changes, the load cell senses the weight change, generates a voltage signal of 0-10mmV, and the voltage signal is output to the amplifier and A/D converter, and the amplified and converted signal becomes a numerical signal of 0-10V , transmitted to a computer, read by the acquisition software running in the computer, written into a file, and saved.

Based on the above principles, a new device for testing, collecting and measuring shale gas content under high temperature and high pressure was established, and the on-site desorption experiment was successfully carried out. In a shale gas gas content project, the comparison with the conventional analysis method shows that the instrument can not only successfully complete the simultaneous desorption of 30 samples on site, but also provide accurate and reliable experimental data, and can quickly and conveniently measure the gas content. The data obtained by the gas volume desorption method is more convenient, and the instrument is more operable.

At the production site, the drilled natural gas is desorbed from the shale core and its cumulative production is metered. By collecting data and detecting the output of natural gas, the gas content of shale gas can be determined. The utility model is mainly composed of a computer, a water storage tank, a weighing sensor, a water collection bag, and a data collection system, and can collect test data of 30 samples at the same time. The utility model can be used to analyze the gas content of the drilled coal rock or shale core, and provide basic data for shale gas resource evaluation, reservoir evaluation and productivity analysis. The results can evaluate the shale gas resource potential and exploration prospects in an area, and become a practical new design, which is suitable for popularization and use in the field of shale gas exploration and development.

The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the present invention. The exemplary embodiments are illustrative only, and not limiting of the scope of the invention, which is defined by the appended claims.

Claims (2)

1. under High Temperature High Pressure, the test of shale gas air content gathers and a measuring apparatus, it is characterized in that comprising: water tank (2), the chest (1) placing water tank (2), conduit (3), silicone tube (4), L-type support (5), LOAD CELLS (6), hook (7), water-collecting bag (8), signal wire (9), amplifier and A/D converter (10), computing machine (11) and direct supply (12);

Described multiple water tank (2) is arranged in chest (1), two conduits (3) are installed at the top of water tank (2), keep the sealing of conduit (3) and water tank (2), the conduit (3) in left side is connected with solution cucurbitula, conduit (3) bottom on right side connects the bottom that the first silicone tube (4) falls to water tank (2), conduit (3) top on right side connects the second silicone tube (4) to water-collecting bag (8), water-collecting bag (8) hangs in LOAD CELLS (6) by hook (7), LOAD CELLS is fixed in L-type support (5), the capable support of L (5) is fixed in the top of chest (1), the signal wire (9) of LOAD CELLS is connected on amplifier and A/D converter (10), signal through conversion is connected with computing machine (11) by signal wire (9), direct supply (12) is connected with LOAD CELLS, to sensor power.

2. under High Temperature High Pressure as claimed in claim 1, the test of shale gas air content gathers and measuring apparatus water tank, it is characterized in that: described chest (1) is of a size of: long 80cm, wide 40cm, high 40cm; The diameter of water tank (2) is 5-15cm, is highly 10-50cm; Water tank (2) is acrylic material; Conduit (3) is stainless-steel tube; L-type support (5) is stainless steel; The range of LOAD CELLS (6) is that 3Kg, DC24V power, and 0-10mmV exports; Water-collecting bag (8) is plastics; Direct supply (12) is 24V direct supply.