METHODS FOR CLEANING TUBULARS USING SOLID CARBON DIOXIDE

摘要

Systems and methods for the cleaning the interior surfaces of tubular members are provided. A flexible conduit having a nozzle disposed on an end can be disposed within the bore of a tubular to be cleaned. The nozzle can have an internal 5-15 degree tapered section with a length-to-diameter ratio of greater than about 2:1. The nozzle can have an outer diameter that is about 80% to 99% of the inner diameter of the tubular. A fluid suspension containing air and solid carbon dioxide can be passed through the nozzle, impinging the surrounding inner surface of the surrounding tubular as the nozzle is disposed within the tubular. The solid carbon dioxide and compressed air suspension can have a solids concentration of from about 0.1% to 10.0% solids. The solids delivery rate through the nozzle can range from about 0.5 lbs/minute to about 5 pounds/minute. The flow of the suspension through the nozzle can be controlled using a remote device.