Rock flow tester
Rock flow tester
1、 Instrument functions
The instrument simulates (pressure, temperature) based on displacement mechanism and similarity principle, and utilizes the latest achievements of modern science and technology, such as computer technology and sensor technology, to conduct the following research under simulated formation pressure and temperature conditions.
1. Determination of liquid permeability
At a certain flow rate, the liquid is passed through the core. By measuring the pressure difference between the inlet and outlet of the core and the flow rate of the liquid flowing through the core, combined with other parameters, the permeability of the core liquid is calculated according to Darcy's law.
2. Liquid flowability experiment
Under certain pressure and temperature conditions, study the laws of relevant parameters such as pressure, temperature, flow rate, etc. during the process of fluid flow through rock cores.
2、 Main technical parameters
1. Work pressure
Ring pressure: 50MPa
Displacement pressure: 40MPa
Pressure test accuracy: 0.1% F · S
2. Flow range: 0.01~10mL/min
3. Working temperature: Room temperature~180 ℃, temperature control accuracy: ± 1 ℃
4. Power supply: AC380V/50Hz three-phase five wire
5. Total power: 6kW
3、 Instrument flowchart:
4、 Basic composition and structure of the instrument
The instrument mainly consists of an injection system, a simulation system, a measurement system, an automatic control system, and a data acquisition and processing system.
Injection system: composed of injection pump, piston container, and pipe valve components, it can inject various fluids into the model at a certain flow rate.
Simulation system: composed of core gripper, constant temperature box, ring pressure pump, back pressure system, etc.
Measurement system: including pressure measurement, temperature measurement, flow measurement, etc.
Data collection and processing: Composed of various data collection cards, computers, printers, and collection and processing software, it can timely collect parameters such as pressure, temperature, and flow rate, and perform arithmetic processing on the data.
5、 Technical specifications for the components that make up the instrument
5-1. Injection pump:
Model: LB1040 Parallel Flow Pump adopts an 89C52 microcontroller and peripheral interface chip to form a microcomputer processing system, which utilizes high-speed data processing and timing/counting functions, and controls the speed regulation and operating status of the stepper motor through program control. This series of pumps can be connected to a computer communication interface and can communicate with multiple machines.
domesticUsing non-circular gear crank connecting rod mechanism to ensure flow measurement accuracy, good pressure resistance and stability; Integrated mechanical and electrical system, with reasonable mechanical transmission and proper structure, and measures for shock absorption and noise prevention, resulting in minimal noise; Equipped with pressure measurement, overvoltage protection, and undervoltage compensation system; Compression automatic compensation program control ensures stable flow accuracy of the pump during high-pressure operation.
5、 Main technical indicators:
(1) Flow range: 0.01-99.99ml/min
(2) Work pressure: 0-40MPa
(3) Repetition accuracy%: ± 1
(4) Flow accuracy%: ± 3
(5) Continuous operation time h:>240
(6) Single cylinder volume μ l: 100
5-2. Piston container:
The ZR-3 piston container provides circulating fluid or displacement fluid for testing. The main material is 316L stainless steel, which is corrosion-resistant and high-temperature resistant. The container adopts a piston structure, and the piston part adopts a combination form. The sealing ring can be adjusted to the best state according to needs, which not only seals but also minimizes friction resistance. The liquid level in the container can also be represented by the computer in the displacement process by gradually reducing the medium on the container based on the accumulated flow rate of the parallel flow pump, the amount of medium in the container, and the volume size. When the displacement reaches a certain percentage of the medium in the container, the constant speed pump power can be automatically cut off. To ensure the temperature conditions for the experiment, place the container in a constant temperature chamber with a specification of 1000mL/50MPa, 2 pieces.
5-3. Core Holder:
TY-4 type gripper, made of 316L stainless steel. The specification is φ 25 × 100/50MPa, and the temperature is 180 ℃. The clamp structure of this model has the following characteristics:
(1) Due to the use of external thread structure, it has the characteristics of small volume, light weight, small dead volume, easy disassembly, strong practicality, and high pressure resistance.
(2) The end face sealing structure is adopted, which makes it convenient to disassemble and assemble the head and core. When replacing the rubber cylinder or O-ring, there is no need to disassemble the handle to unscrew the pressure cap and remove the head. Under normal circumstances, there is no need to disassemble the pressure cap and head when replacing the core. Simply unscrew the adjusting nut and use a special tool to remove the core.
5-4. Ring pressure pump:
The SYB-50 manual pump applies circumferential pressure to the core, seals the core, forms a complete fluid path, and prevents fluid from flowing out along the outer side of the core. Work pressure ≤ 60MPa
5-5. Backpressure control system:
Used to control the outlet pressure of the core gripper, it consists of a top loading back pressure valve, a buffer container, and a back pressure pump.
Pressure vessel: ZR-2 type, 600mL, 50MPa, equipped with pressure gauge
Back pressure valve: HY-2 type top loading type, 50MPa
Backpressure pump: SYB-50 manual pump
5-6. Thermostatic box:
Front and rear doors, equipped with spotlights inside, stainless steel inner liner, using a silent axial flow fan for hot air circulation inside the box, and A3 phosphating spray coating on the outside, beautiful and atmospheric. Equipped with casters and support feet, easy to move, and adjustable positioning level.
Adopting PID regulation temperature control technology, the temperature inside the box is uniform and the temperature control accuracy is high:
Working temperature: 180 ℃± 1 ℃
Inner container size: 1000 x 650 x 800 mm (length x width x height)
5-7. Valves, pipelines, fittings and processes:
Adopting DW6 internal sleeve high-pressure valve and fittings, with a pressure resistance of 60MPa, made of 316L stainless steel material.
5-8. Measurement System:
Pressure measurement: with a measurement accuracy of 0.1% F · S, used for measuring the inlet and outlet pressure of rock cores, with a range of 40MPa, displayed on a digital display, and can also be collected by a computer through the RS232 port on the digital display.
Temperature measurement: PT100 temperature probe and XMT-7512ZXG5 temperature controller are used to set, control, and measure temperature. The temperature can also be set and collected by a computer.
Flow measurement: using balance weighing method to calculate liquid flow rate
Scale specification: Range 2200g, accuracy 0.01g
Computer automatically collects and calculates traffic values
5-9. Data collection system:
Use MOXA C168H/PCI and MOXA C104H/PCI data acquisition boards to timely collect pressure, temperature, and flow rate.
5-10. Automatic control system:
Computers can control the following external devices
(1) Injection pump: Through the communication interface of the pump, the computer can control the injection flow rate of the pump;
(2) Balance: Through the communication interface of the balance, the computer can perform peeling operations on the balance;
5-11. Application software and data processing:
The software runs in a Windows environment and is programmed using VB. The workflow of the instrument is displayed on the interface, enabling human-machine dialogue. After the operator sets the parameters, unmanned operation can be achieved. The computer can automatically collect all pressure, temperature, flow rate, and control the operation of the pump.
The data collected by the computer can be processed to generate raw data reports, analysis reports, and curve graphs. At the same time, database file formats can be generated, and EXCEL documents can be imported at any time for users to use flexibly.
Computer: 2.8GB clock speed, 8GB memory, 1TB hard drive, 22 inch LCD display
6、 Main technical features
1. The device adopts modular design and can be combined according to different requirements;
2. Can simulate high-temperature and high-pressure displacement tests under geological conditions;
3. Implement computer automation control, collection, and processing;
4. The structure of the instrument is reasonable, the appearance is beautiful and elegant, the operation is convenient, and it is durable;
5. The optional parts are complete, and different specifications of models can be selected according to different testing requirements, making the instrument widely used in various experimental research fields.
7、 Security
The safe operation of the instrument involves the personal safety of the operator and the normal service life of the instrument. The manufacturer reminds the operator to pay attention to the following points:
1. All types of instruments and computers must ensure correct power input and be equipped with automatic voltage stabilization protection devices.
2. Ensure that all parts of the instrument have good grounding.
3. The pressure of each part of the process 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.
4. 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.
5. When operating at high temperatures, the system must be equipped with insulated gloves to prevent burns.
8、 Installation
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 daily maintenance in the future.
9、 Maintenance
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 control machine 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. When using it, be careful not to drop corrosive solutions onto the operating platform. If accidentally splashed, it should be dealt with in a timely manner.
Long term use can cause normal damage to the process seals, affecting the sealing performance. Therefore, it is recommended to regularly conduct pressure tests on the instruments to ensure their integrity Replace the seal for the leaked part, and for regular users, a cycle of 3 months is recommended.
