QC-1 Gas Drive Recovery Experiment Device

1The main functions of the gas drive recovery rate experimental device

It is mainly used for experimental research on gas injection miscible/immiscible oil recovery efficiency, flow characteristics of gas drive oil, flow control of gas drive process, and optimization of gas injection method related to gas drive development technology. It can effectively improve the development effect of low-permeability reservoirs and provide technical reserves for improving the recovery rate of low-permeability reservoirs, and provide technical solutions for numerical simulation research.

IIThe main purpose of

• Evaluation of gas drive oil displacement effect;
• Optimization of injection parameters (pressure, injection speed, injection timing, injection volume, injection method, etc.);
• Gas driven oil displacement characteristics (displacement pressure, extracted oil and gas components, water content, oil displacement efficiency, etc.);
• The impact of gas injection on reservoir properties;
• Research on Flow Control in Gas Drive Process;

IIIMain technical indicators

• Work pressure: 0~50MPA
• Working temperature: Room temperature~180 ℃
• Displacement flow rate: 0.01~25ml/min, with constant speed and pressure displacement function
• Core clamp: φ 25 × 300-500mm
• Pressure measurement accuracy: FS1％
• Temperature measurement accuracy: ± 0.5 ℃
• Oil, gas, and water measurement accuracy: 0.02ml for gas and 0.01g for liquid

4Basic composition and structure of the instrument

The instrument consists of an injection system, a modeling system, a measurement system, an automatic control system, and a data acquisition and processing system. See workflow for details:

Inject system:It consists of an injection pump, an intermediate container, a gas pressurization system, a gas pressure regulating system, pipe valves, etc., and can inject various fluids into the model at a certain flow rate.

Simulation system:It consists of a core gripper, a constant temperature box, an annular pressure pump, a back pressure system, etc.

Measurement system:Including pressure measurement, temperature measurement, flow measurement, oil gas water volume measurement, etc.

Auto-Control:The computer automatically controls the flow rate of the injection pump. Constant temperature box heating, etc.

Data collection and processing:Composed of various data acquisition cards, computers, printers, and acquisition and processing software, it can timely collect parameters such as pressure, temperature, and flow rate, and perform arithmetic processing on the data.

5Technical specifications of each component of the instrument

• Injection Pump

The pump adopts imported AC servo motor and servo system, controlled by microcomputer for operation, with constant speed and pressure drive function, working pressure: 60MPA, flow rate: 0.01~25ml/min

• intermediate container

ZR-3 piston type volume: 1000ml, pressure resistance: 50MPA, material: 1Cr18Ni9Ti, quantity: 4 pieces

Used for storing replacement media and serving as a buffer.

3. Gas booster pump: composed of gas booster pump, gas booster container and other components, it pressurizes the low-pressure gas in the gas cylinder to a high-pressure state.

Gas booster pump: working pressure 50MPA, flow rate 20L/h.

Gas pressurized container: piston type, pressure 50MPA, container 2L. Quantity: 1 unit.

High pressure gas storage tank: pressure 50MPA, volume 2L. Quantity: 1 unit.

• Gas pressure regulating system: divided into high and low levels of pressure regulation, using imported TESCOM pressure regulating valves

Inlet 6000psi, outlet 0-500psi, one

Inlet 10000psi, outlet 0-6000psi, one

• Long core clamp, core size of φ 25 × 500mm, evenly distributed with 4 pressure measuring points, working pressure of 50MPA
• incubator

Working temperature: 180 ℃± 1 ℃

Studio dimensions: 1500 × 750 × 800mm (length × width × height)

Front and rear doors, interior lighting, made of stainless steel material

Hot air circulation, using PID regulation temperature control technology, with uniform temperature inside the box and high temperature control accuracy.

Install rolling casters for easy mobility.

• Environmental pressure tracking pump

Work pressure: 60MPA, used to apply circumferential pressure to the core gripper and seal the core. It can automatically track the inlet pressure of the rock core and maintain a certain pressure difference between the ring pressure and the displacement pressure. Control accuracy ± 0.2MPA

• Export backpressure control system

Used to control the outlet pressure of rock cores, with a control range of 0-50MPA, including

Backpressure pump: working pressure 50MPA

Backpressure buffer container: ZR-2 type, 1000ml, 50MPA

Top loaded back pressure valve: Top loaded, 50MPA

• Measurement system: including pressure measurement, temperature measurement, liquid flow measurement, oil gas water volume measurement, etc.

Pressure measurement: Measure pressure with a pressure transmitter. Range of 60MPA. There are a total of 6 pressure measuring points.

Temperature measurement: PT100 temperature probe is used to measure temperature. Measurement range: Room temperature -200 ℃

Liquid flow measurement: using a balance to measure liquid flow: Balance model: BS2202S。

Oil, gas, and water volume measurement: The volume of oil and water at the outlet is manually measured using a measuring tube, while the gas is measured using a wet gas flowmeter.

• Automatic control system: capable of automatically controlling the flow rate of the injection pump, automatic tracking of environmental pressure, etc.
• Data acquisition and processing system: composed of data acquisition board, data acquisition and processing software, computer, printer and other components, it can timely collect parameters such as pressure, temperature, flow rate, etc., and perform arithmetic processing on the data.

VIMain technical features

• The device adopts modular design and can be combined according to different experimental requirements;
• Capable of conducting high-temperature and high-pressure displacement tests under simulated geological conditions;
• The key components are imported, with extremely high reliability and accuracy in testing;
• Realize computer automation control, acquisition, and processing;
• Track the injection pressure of the ring pressure and maintain a constant pressure difference;
• The structure of the instrument is reasonable, the appearance is beautiful and elegant, the operation is convenient, and it is durable and long-lasting;
• We have a complete range of optional parts and can select models of different specifications from our factory according to different testing needs, making the instrument widely used in various experimental research fields.

7peacefulcomplete

The safe operation of the instrument involves the operator's personal safety and the normal service life of the instrument. The manufacturer reminds the operator to pay attention to the following points:

The internal instruments and computers of the instrument must ensure correct power input and must be equipped with automatic voltage regulation protection devices.

Each part of the instrument must be properly grounded.

The pressure of each part of the instrument manifold should not exceed the design pressure, especially not exceed the range of various detection instruments. Extra caution must be taken when using gas pressurization.

The valve design of the instrument is manual operation. Please pre design the test process according to the test steps. Any valve operation error may lead to the failure of the entire test.

The system must be equipped with insulated gloves during high-temperature operation to prevent burns.

Special attention: When heating, due to the expansion of the liquid caused by heat, the pressure increases. Therefore, the liquid in the container cannot be filled to prevent the pressure from being too high and exceeding the container's operating pressure.

8flow chart

9peacefuldress

All instruments have been installed and tested before leaving the factory. For the convenience of packaging and transportation, the instrument is divided into different parts for packaging. Please carefully refer to the flowchart during installation.

The installation work can also be jointly completed by the factory's technical personnel and the user, so that the user can further familiarize themselves with the instrument and facilitate normal maintenance in the future.

10basic operation

• Rock sample preparation

（1）. Drilling and cutting of rock samples: Drill the rock sample into a cylindrical shape with a diameter of 25, cut both ends flat, and ensure that the cutting surface is perpendicular to the axis.

Refer to SY/T5336 for the method of drilling rock samples

(2). Wash oil for rock samples

The oil washing method shall be carried out in accordance with SY/T5336

（3）. Drying of rock samples

The drying temperature of the rock sample should be controlled at 60-65 ℃. After drying for 24 hours, it should be weighed every 8 hours. When the difference between the two weighings is less than 10mg, the measured mass of the rock sample should be recorded.

（4）. Measure the geometric dimensions of the rock sample: length (L), diameter (D).

(5) The determination of gas permeability in rock samples shall be carried out in accordance with SY/T5336.

(6) Extract saturated oil (water) from the rock sample, weigh it wet, and calculate the pore volume of the rock sample.

(7) Soak the saturated rock sample in oil (water) and set it aside.

2. Process preparation

Ensure that the liquid in the storage container and various pumps is sufficient. If it is insufficient, please add it.

• Installation of rock cores

Take out the pre saturated rock core from the beaker, place it in the clamp rubber sleeve, insert the clamp plug, and tighten the rock sample.

• Seal the rock sample with ring pressure
• Apply back pressure

Backpressure control is achieved by applying pressure to the back pressure valve, and the external control pressure is gas to ensure control accuracy.

• Heating up

First, turn on the fan switch of the constant temperature box on the panel, then turn on the heating switch. Set the temperature to be heated on the temperature controller, and the temperature controller will automatically control the constant temperature box to reach the desired temperature.

The temperature setting method of the temperature controller is detailed in the temperature controller user manual

To stop heating, simply turn off the heating switch or set the temperature controller to a temperature lower than room temperature.

• experimental evaluation

Various experimental methods are detailed in their experimental evaluation criteria.

11、 Weiprotect

The constant speed pump needs to be cleaned regularly, and for detailed maintenance, please refer to the constant speed pump manual.

Electronic scales should avoid strong vibrations and must not be overloaded. For detailed precautions, please refer to the scale manual.

The computer equipped with this instrument is a dedicated controller for the instrument. Do not copy software randomly, especially USB drives of unknown origin. Computer viruses may cause confusion and errors in control and data acquisition.

All parts of the instrument that come into contact with liquids are made of stainless steel, which has a certain degree of corrosion resistance, but it is not a one-time solution. The process manifold needs to be cleaned regularly, especially after injecting acid or other highly corrosive liquids, it should be immediately cleaned with clean water. When the process is not in use for a long time, fill the process manifold with oil or blow dry it with high-pressure air to prevent rust and corrosion.

Long term use can cause normal damage to the process seals, affecting the sealing performance. Therefore, it is recommended to conduct pressure tests on the instrument regularly, replace the seals in the leaking parts of the instrument, and for frequent users, a cycle of 3 months is recommended.