MLchartDataset catalogue

Perforate underbalanced

Term · Oil and gas · MLC-T-OAG-002734

To create perforations in a cased wellbore while the hydrostatic pressure of the fluid in the well is intentionally kept lower than the formation pressure. This pressure differential causes an immediate surge of reservoir fluids into the wellbore, flushing out crushed rock, charge debris, and drilling mud filtrate from the newly created tunnels. The underbalance pressure is designed to be between 200 and 500 psi, but can be higher in low-permeability reservoirs.

Table 1. Record
IdentifierMLC-T-OAG-002734
FieldOil and gas
SubjectPerforating
Record as JSON 
{
  "id": "MLC-T-OAG-002734",
  "term": "Perforate underbalanced",
  "field": "Oil and gas",
  "definition": "To create perforations in a cased wellbore while the hydrostatic pressure of the fluid in the well is intentionally kept lower than the formation pressure. This pressure differential causes an immediate surge of reservoir fluids into the wellbore, flushing out crushed rock, charge debris, and drilling mud filtrate from the newly created tunnels. The underbalance pressure is designed to be between 200 and 500 psi, but can be higher in low-permeability reservoirs.",
  "subject": "Perforating",
  "url": "https://mlchart.com/terminology/oil-and-gas/perforate-underbalanced/"
}

Record 2,913 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.