Structure optimization and evaluation of the testing module of intelligent downhole production allocator

For refined zonal production of offshore slim-hole oil production wells, an intelligent downhole production allocator, integrating flow rate control and selective water-cut and flow rate testing, was developed, and the structure of its testing module was optimized. To begin with, the numerical simulation model was built to optimize the geometry designs of the radio-frequency water cut testing channel and the ultrasonic flow rate testing channel. Moreover, the allocator prototype was manufactured in accordance with the optimized design and evaluated via testing. The numerical simulation structure optimization shows that the testing requirements and minimum device dimensions can both be facilitated in the case of the water-cut testing channel with a length of 200 mm and diameter of 26 mm and the flow rate testing channel of a length of 150 m and diameter of 15 mm. The prototype testing shows that the flow rate testing range of the allocator is 10-300 m³/d and the full-scale error is 3.97%, the water cut testing range is 0-100% and the full-scale error is 5.5%. These evaluation indexes satisfy the field application technical requirements.