Nipple up

{
  "id": "MLC-T-OAG-002539",
  "term": "Nipple up",
  "field": "Oil and gas",
  "definitions": [
    "To assemble and install pressure control equipment, such as the blowout preventer (BOP) stack, onto the wellhead at the beginning of a drilling or well intervention operation. The process involves lifting each component into place, bolting the flanged connections, and performing pressure tests to confirm the integrity of all seals. A successful pressure test of the BOP stack is required by regulation before drilling can proceed past the surface casing.",
    "To assemble and install the blowout preventer (BOP) stack and associated pressure-control equipment onto the wellhead of a surface or subsea well. This operation involves lifting the components into place, aligning flanges, and tightening bolts to create a high-pressure seal. A successful pressure test of the entire BOP stack assembly is required after nippling up to confirm its integrity before drilling operations can commence."
  ],
  "subject": [
    "Drilling",
    "Well Completions"
  ],
  "url": "https://mlchart.com/terminology/oil-and-gas/nipple-up/"
}