Doc Extraction Drilling Riser Viv Parameters

VIV Parameters (+3)

VIV Parameters

Vortex-induced vibration parameters for riser fatigue assessment.

Detection heuristics:

• Keywords: "vortex-induced vibration", "VIV", "Strouhal number", "reduced velocity", "lock-in", "mode shape", "vortex shedding"
• Symbols: St, V_r, f_s, f_n, A/D
• Units: Hz, m/s, dimensionless
• Often in sections titled "VIV Assessment" or "Fatigue from VIV"

Key extraction fields:

- content_type: constants
  domain: drilling_riser
  sub_type: viv_parameter
  data:
    name: "Strouhal number — smooth cylinder"
    symbol: "St"
    value: 0.2
    units: dimensionless
    applicability:
      surface: "smooth"
      reynolds_range: "subcritical"
    source: "DNV-RP-C205 Section 9.3"

VIV parameter reference values:

Mode shape extraction:

• Detect mode number, natural frequency, wavelength
• Boundary conditions: tension-controlled, pinned-pinned, fixed-fixed
• Added mass coefficient (C_a) by proximity to seabed

Kill and Choke Line Specifications

Auxiliary line properties for well control.

Detection heuristics:

• Keywords: "kill line", "choke line", "auxiliary line", "bore"
• Pattern: table with ID, OD, pressure rating, material grade columns
• Units: inches (ID/OD), psi or MPa (pressure), ksi (yield)
• Often in riser stack-up tables or well control equipment specs
• Note: values are edition- and vendor-dependent; always capture source edition

Key extraction fields:

- content_type: tables
  domain: drilling_riser
  sub_type: kill_choke_line
  data:
    title: "Kill/choke line specifications"
    columns:
      - {name: line_type, units: null}
      - {name: ID, units: inches}
      - {name: OD, units: inches}
      - {name: working_pressure, units: psi}
      - {name: burst_pressure, units: psi}
      - {name: collapse_pressure, units: psi}
      - {name: material_grade, units: null}
    source: "API RP 16Q Table 4"

Typical kill/choke line parameters:

BOP Stack Configurations

Blowout preventer stack layout and component specifications.

Detection heuristics:

• Keywords: "BOP", "blowout preventer", "annular preventer", "pipe ram", "blind ram", "shear ram", "stack height", "wellhead connector"
• Pattern: vertical stack-up diagram or table listing components top-to-bottom
• Units: inches (bore), feet or meters (height), tons (weight)
• Often accompanied by schematic drawings

Key extraction fields:

- content_type: tables
  domain: drilling_riser
  sub_type: bop_configuration
  data:
    title: "BOP stack configuration — 18-3/4 inch, 15K"
    components:
      - {position: 1, type: "annular preventer", bore: "18.75 in", rating: "10,000 psi"}
      - {position: 2, type: "annular preventer", bore: "18.75 in", rating: "10,000 psi"}
      - {position: 3, type: "pipe ram", bore: "18.75 in", rating: "15,000 psi"}
      - {position: 4, type: "blind/shear ram", bore: "18.75 in", rating: "15,000 psi"}
      - {position: 5, type: "pipe ram", bore: "18.75 in", rating: "15,000 psi"}
      - {position: 6, type: "casing shear ram", bore: "18.75 in", rating: "15,000 psi"}
    stack_height: {value: 35, units: feet}
    dry_weight: {value: 400, units: tons}
    source: "API STD 53 Section 5"  # BOP config authority is API STD 53, not API RP 16Q

BOP component types:

Riser Stack-Up Data

Joint-by-joint riser assembly data.

Detection heuristics:

• Keywords: "stack-up", "riser joint", "pup joint", "flex joint", "telescopic joint"
• Pattern: table with component name, length, weight, buoyancy columns
• Units: feet or meters (length), kips or tonnes (weight)
• Sequential ordering from mudline to surface

Key extraction fields:

- content_type: tables
  domain: drilling_riser
  sub_type: riser_stack_up
  data:
    title: "Drilling riser stack-up"
    columns:
      - {name: component, units: null}
      - {name: length, units: ft}
      - {name: dry_weight, units: kips}
      - {name: buoyant_weight, units: kips}
      - {name: OD, units: inches}
      - {name: ID, units: inches}
    source: "Riser analysis report Section 3"