Abstract
In the process of production logging interpretation, a water cut is one of the key factors to obtain the oil phase content in the oil well. In order to measure the water cut of the horizontal oil–water two-phase flow with low yield, the response characteristics of the combined capacitance sensor (CCS) are investigated under different flow patterns. Firstly, the measuring principles of coaxial, cylindrical, and CCS are introduced in detail. Then, according to the different flow pattern conditions of the horizontal oil–water two-phase flow, the response characteristics of the CCS are simulated and analyzed using the finite element method. Additionally, compared with the other two sensors, the advantages of the CCS are verified. Finally, the temperature and pressure calibration experiments are carried out on the CCS. The horizontal oil–water two-phase flow patterns in a low yield liquid level are divided in detail with a high-speed camera. Dynamic experiments are carried out in a horizontal pipe with an inner diameter of 125 mm on the horizontal oil–water two-phase flow experimental equipment. The simulation and experimental results show that the CCS has good response characteristics under different working conditions.
Highlights
As an efficient production logging technology, horizontal well development plays an important role in improving single well productivity and oil recovery [1,2]
capacitance sensor sensor (COS) was consistent, and the slope of the CYS response curve was smaller, which indicates that the capacitance sensor (CCS) and the COS have a better resolution ability compared with the CYS for the water in oil emulsion (W/O) flow pattern under different water cuts
Considering that the measurement results of the instrument were influenced by the repeatability errors of measurement and system errors for long time continuous operation, the horizontal oil–water two-phase flow experimental facility was used to carry out the segregated flow experiments multiple times using the experimental point where the flow rate was set as 3, 5, 10, 15, 20~60 m3 /d by a step of
Summary
As an efficient production logging technology, horizontal well development plays an important role in improving single well productivity and oil recovery [1,2]. It is necessary to understand the flow characteristics of horizontal oil–water two-phase flow for the water cut measurement. It can be deduced that various complex flow structures in the horizontal two‐phase flowthat bring new challenges to the design of measurement horizontal oil–water pipe It can be deduced various complex flow structures inparameter the horizontal oil–water sensors. The coaxial capacitance sensor may be submerged in in water phase under conditions of oil–water two‐phase stratified flow, which reduces thethe oiloil or or water phase under thethe conditions of oil–water two-phase stratified flow, which reduces the the resolution of the water cut measurement. 20and m /d and below the sensor the requirements the water measurement in horizontal wells within the application range of the flow rate.
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