Technical Function Requirements (1) Adopting a combination of Darcy and non-Darcy flow tests according to different experimental requirements, suitable for low-permeability, ultra-low-permeability reservoirs, and unconventional reservoir sensitivity tests. (2) The instrument device design is rational, with a compact layout, easy operation, good sealing, and strong corrosion resistance, in compliance with ergonomic principles. (3) Ultra-low-permeability sensitivity testing uses the liquid pressure pulse decay method for testing and data processing. (4) Pressure sensors utilize high-precision imported pressure sensors, with stepped series connection, high pressure of 60MPa, medium pressure of 10MPa, and low pressure of 1MPa, with an accuracy of 0.1%FS. (5) The back-pressure system is automatically controlled by a back-pressure pump, with a pilot balanced valve design; the wetted material is Hastelloy HC276, and the rubber sleeve and seal are imported high-temperature fluororubber. (6) High degree of automation, with real-time online measurement of hoop stress, pore pressure, back pressure, balance, and flow rate. Experiment parameters are controlled through software, with automatic collection and processing of experimental data, curve plotting, and result output; experimental test data can be remotely monitored, enabling video observation, etc. (7) Series and modular design of the device, which can be combined according to different experimental requirements. The system is equipped with over-temperature, over-pressure, and power failure protection devices, operating smoothly and quietly with safety and reliability. Technical Parameters (1) Power Supply Voltage: AC 220/380V, 50Hz; overall power less than 10kW. (2) Operating Pressure and Temperature: displacement pressure of 70MPa; pressure accuracy of 0.1 grade; room temperature to 180°C, accuracy ±1.0°C. (3) Hoop Pressure: 0-80MPa, automatic tracking accuracy less than 0.1MPa. (4) Core Specification: φ25.4×30-80mm. (5) Injection Pump Flow Rate Test Range: 0.0001-30mL/min, flow rate accuracy 0.3%, pressure range: 0-70MPa; pressure accuracy: 0.1%FS. (6) Gas Boosting: silent air compressor exhaust volume of 0.280m3/min, pressure of 10bar; gas displacement boosting pump input pressure of 20bar, output pressure of 700bar; high-pressure gas storage tank volume of 2L, pressure resistance of 70MPa; precision pressure reducing valve input pressure of 700bar, output pressure of 500bar. (7) Back-pressure System: 50MPa, pressure control accuracy: ±0.1MPa, temperature resistance of 180°C. (8) Liquid Measurement System: range of 220g electronic balance, accuracy 0.1mg; range of 620g electronic balance, accuracy 1mg; provides 1.0mL, 2.5mL, 5.0mL capillary micro-measurement methods with accuracy of 0.02mL, 0.05mL, 0.10mL, respectively. (9) Gas Flow System: 0-10SCCM, 0-100SCCM, accuracy 1%FS; equipped with a soap bubble flowmeter for manual calibration. (10)恒温箱: internal dimensions: length×width×height 1400×800×1000mm (11) Computer: computer uses Advantech EPC industrial control mainframe, CPU i7-8700, memory 32G DDR4, 1T mechanical hard drive, 512G SSD, 24" LCD brand monitor. (12) Working Medium: nitrogen, acid, alkali, saltwater, fracturing fluid, drilling fluid, etc. (13) Wetted Material: Hastelloy. (14) Others: accessories use quick couplings for easy assembly and disassembly of the process, intermediate pressure vessels have handles, and the cleaning process is simple and convenient.
