Development and application of reversing continuous sand washing device inside the casing;

A continuous sand washing apparatus and sand control unit are used in operation, by which stack accidents can be effectively avoided, the pollution in sand washing operation is solved and sand washing efficiency is raised.

The disadvantage using coiled tubing for continuous sand washing in the multilateral horizontal wells is that the diameter of coiled tubing is small,borehole size is big,the return speed of sand washing liquid is low while washing sand,and it is not easy to sand out to the ground.

Development and application of continuous sand washing technology;

The technology can realize sand washing without stopping the pump and reuse of the returning fluid with sand removed by using the continuous sand washing device along witll the multiple-stage sand removal device.

Experimental study on dynamic behaviors for shell-and-tube heat exchangers with continuous baffles;