Experimental Study on Gas-Liquid Sand Carrying Flow in Wellbore

For the water-producing sand gas well, the law of gas-liquid carrying sand flow in the wellbore is the key basic problem in the process of carrying sand production. In order to master the law of gas-liquid carrying sand flow in the wellbore and its influencing factors, an experimental study on the law of gas-liquid carrying sand flow is carried out for the single section wellbore. In order to guide the engineering design more intuitively, the critical gas flow rate in the shaft is defined when the gas flow rate is lower than a certain limit value. The gas-liquid two-phase sand carrying experiment shows that the sand particle is completely entrained in the liquid phase, and its movement law is related to the liquid transport speed. The key to whether the sand particle deposit lies in the average transport speed of the liquid phase and the average sinking speed of the sand particle. In the process of gas-liquid two-phase sand carrying, the liquid flow rate is the main control factor of the critical gas flow rate of sand carrying. The greater the liquid flow rate, the smaller the critical gas flow rate of sand carrying. Overall, the inclination angle has a relatively small effect on the critical velocity of gas-liquid two-phase sand.