Measure-While-Adjust (MWA) Stratified Water Injection System

　　1.What is the Measure-While-Adjust(MWA)water injection system?The MWA system is an advanced stratified water distribution technology consisting of downhole adjustable injectors,cable-operated testing/sealing tools,and a surface control terminal.Unlike conventional methods,it allows real-time flow measurement and precision adjustment in a single trip,eliminating the need for traditional nozzle"drop-and-retrieve"operations.

　　2.How does the system maintain water injection in other layers during a single-layer adjustment?The system utilizes a specialized bridge-passage design where the downhole injector features longitudinal bridge channels and holes that penetrate the upper and lower ends.This technical feature ensures that when tools are engaged in one layer,water flow can bypass the tool to reach lower zones,maintaining continuous injection across the entire well.

　　3.What materials are used to ensure tool longevity in corrosive downhole environments?The main body of the adjustable injector is fabricated from 25Cr Super Duplex Stainless Steel,which provides superior resistance to corrosion and wear.All materials and seals(FKM)strictly comply with API and NACE standards for high-reliability performance.

　　4.What are the maximum operating limits for pressure and temperature?The system is engineered for extreme reservoir conditions,supporting a maximum working pressure of 50 MPa and a maximum operating temperature of 150°C.Additionally,the injector can withstand an internal/external differential pressure of 25 MPa,facilitating reliable packer setting.

　　5.How accurate is the flow measurement and adjustment capability?The integrated testing tool utilizes an ultrasonic flowmeter with a measurement range of up to 1600 m³/d and a precision of±2%F.S..This allows operators to use the"deduction method"to calculate real-time flow and adjust the injector’s nozzle opening until the target injection rate is achieved within the error margin.

　　6.Can the system verify packer integrity(sealing)in a single trip?Yes.The sealing verification tool features upper and lower rubber elements(packing elements)that expand via motor drive to isolate the target zone.By monitoring the internal pressure(P1)and external pressure(P2)sensors—which have a precision of±0.1%F.S.—operators can confirm if a packer has failed without multiple tool runs.

　　7.How does the mechanical adjustment mechanism prevent electronic failure risks?While the control tools are electronic,the permanent downhole injector is a purely mechanical structure.It uses a rotating sleeve with high-hardness sleeves to modulate the water outlet's opening.This hybrid approach combines the precision of electronic control during the"adjustment trip"with the long-term reliability of mechanical hardware.

　　8.Is the system compatible with deviated or horizontal wells?The system features a concentric large-channel design with a minimum internal diameter ofφ56 mm and a tool outer diameter ofφ52 mm.Both the testing and sealing tools include magnetic positioning functions,ensuring accurate docking and high operation success rates in vertical,inclined,and deviated wellbores.

　　9.What is the role of the Ground Terminal in the MWA system?The Ground Terminal serves as the power and communication hub,providing 0-300V DC power(typically 50-100V for downhole tools)and interfacing with a PC.It allows for real-time monitoring of load current,visualization of flow curves,and remote command execution for expanding/retracting tool arms.

　　10.What are the key technical specifications of the downhole injector?

　　Max Outer Diameter:φ140 mm.

　　Connection Type:4.5-inch VAM TOP Pin x Box.

　　Single Layer Max Injection:1200 m³/d.

　　Bypass Flow Capacity:1600 m³/d.