Study on Minimum Sand Carrying Capacity of Rod Pumping Wells

Daqing Oil Field belongs to unconsolidated sandstone reservoir. Due to small fluid output of single well, poor sand carrying capacity and frequent sand production in the reservoir, sand control screen pipe plugging, pump jamming and other problems are caused. This article obtains a prediction formula for the sand settling rate of reservoirs near the wellhead through fluid sand settling experiments, and corrects the non-uniform shape of sand in the reservoir using this method. The correlation between the sand settlement rate under different formation pressure and the average velocity of flow field in well is obtained through calculation and the corresponding calculation formula is given. Based on the optimization of the production process of the traditional rod pumping unit, an optimal design scheme of the production process parameters of the rod pumping unit is presented, and the scheme is reasonable and reliable. The practice has proved that the sand settlement and the height of sand column in the pump chamber can be predicted well during sand production, Which Practice has proved that during sand production, the sand production settlement and the sand column height in the pump chamber can be well predicted, and the minimum sand carrying capacity of the oil well under the reservoir pressure and production pressure difference can be calculated, which provides a basis for reasonable selection of sand production well string.