Casing drilling lowers well costs

摘要

Always on the lookout for new technology that improves efficiency, increases safety and lowers costs, one Chinese oilfield operator found a solution by drilling the top section of wells with a casing drilling system. The Dagang Oil Field Shallow Water Co. division of PetroChina adopted Weatherford's Drilling-with-Casing (DwC) service to batch-drill 10 wells with 13/6-in. surface casing at the Zhuang Hai-4 area of Dagang field. By the time the project was finished, the company had saved some USD320,000 compared with drilling the wells with a conventional drilling string and later running casing in the hole.