New understanding on the morphology of sand setting in horizontal well section

Aiming at the issues of high difficult, great risk of sand washing and not easy to treat sand setting in horizontal well section, the different morphologies of sand in horizontal well section and in vertical well section have been analyzed in this paper, and then the space form and stress state of sand in wellbore were illustrated in detail. Through the example of sand setting string processing in horizontal well section, we figured out that the sanding-in processing in horizontal well section is less difficult than that in vertical well section, and the risk of sand washing in horizontal well section is also lower than that of vertical section. Based on this, new sand washing and releasing stuck method was proposed, making the operation easier. The novel method not only greatly enhances the operation efficiency but also reduces the cost of well repairing.