For low production and low efficiency wells

interval production is usually used to tap potential. However

most practices are based on qualitative and benefit factors to determine interval production parameters

which are lack of scientific accuracy. In order to optimize and study the interval production parameters more precisely and quantitatively

combining the theoretical basis of material balance

inflow and outflow dynamics and other parameters such as well deviation and reservoir physical properties are taken into account

the mathematical model of fluid level coupling in the switch well for interval oil production is established. The coupling model calculation results are innovatively matched with the measured dynamic level recovery curve to obtain the reservoir physical parameters. On the basis of the above

the dynamic liquid level during shut in and pumping is divided into equal parts by enumeration method

the reasonable working parameters are determined by optimizing and evaluating the wellhead production

pump efficiency and formation inflow. The field application verification shows that: fitting the numerical iteration results of the coupled mathematical model with the measured liquid level recovery curve

it can more scientifically determine the interval production parameters. At the same time

it also ensures that the oil wells are in an efficient and coordinated supply and discharge relationship.