Delivery method and compositions

摘要

A method of delivering a concentrated quantity of sealing elements to a leak site in a vessel (1) comprises the steps of deploying a flexible body of material (4) and at least one sealing element (3) into fluid (2) flowing within the vessel upstream of the leak site whereby the body of material transports the sealing elements through the vessel to the leak site where the body of material is drawn to the leak by fluid flow created by a pressure differential at the leak site, and wherein the sealing element(s) are constrained by the body of material at the leak site such that the sealing element(s) become(s) entrained within the leak.