71331000 - Drilling-mud engineering services

CPV code 71331000 in the EU Common Procurement Vocabulary refers to Drilling-mud engineering services. It sits at level 4 of the CPV hierarchy as a category within the 71 division. This code is nested directly under 71330000, narrowing the broader category into the specific area of drilling-mud engineering services. As a leaf code, 71331000 has no further subdivisions and represents the most precise classification available in this branch — buyers should reference it directly in tender notices when the procurement primarily concerns drilling-mud engineering services. Contracting authorities across the EU use 71331000 in TED notices and national procurement portals to signal that a tender relates to drilling-mud engineering services.