Polished Bore Receptacle (PBR)

Polished Bore Receptacle (PBR)

Definition(s)

Polished Bore Receptacle (PBR)

A device with a honed internal diameter (ID) sealing surface for landing a production tubing seal assembly or tie back casing. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
Physical Barrier Element

Physical Barrier Element

Definition(s)

Physical Barrier Element

Physical barrier elements can be classified as hydrostatic, mechanical or solidified chemical materials (usually cement). Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
PBR

PBR

Definition(s)

PBR

Polished bore receptacle. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
Overbalance Pressure (OBP)

Overbalance Pressure (OBP)

Definition(s)

Overbalance Pressure (OBP)

Overbalance pressure is the amount by which the hydrostatic pressure exceeds the pore pressure of a formation. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
OBP

OBP

Definition(s)

OBP

Over balanced pressure. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
OBM

OBM

Definition(s)

OBM

Oil-based mud. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards  
NI

NI

Definition(s)

NI

Calculated number of cycles to failure at a constant stress range. Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards

NI

Ampere turns. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
Operator Imposed Casing Pressure

Operator Imposed Casing Pressure

Definition(s)

Operator Imposed Casing Pressure

Pressure in a casing that is operator imposed for purposes such as casing pressure integrity tests (prior to drilling out the shoe), gas lift, fluid injection, stimulation treatments, thermal insulation, etc. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  

Operator Imposed Casing Pressure

Casing pressure that is operator-imposed for purposes such as gas lift, water injection, thermal insulation, etc. Source: API RP 90, Annular Casing Pressure Management for Offshore Wells, Upstream Segment. First Edition, August 2006. Global Standards
MWD

MWD

Definition(s)

MWD

Measuring while drilling. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines  

MWD/LWD

Management while drilling / logging while drilling. Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards  

MWD

Measurement While Drilling. Source: NOGEPA Industrial Guideline No. 41, Well Construction Process Checklist, Drilling Best Practices, Netherlands, Version 0, December 2011. Global Standards Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards  
Non-Aqueous Fluid (NAF)

Non-Aqueous Fluid (NAF)

Definition(s)

Non-Aqueous Fluid (NAF)

Non-aqueous fluid is a non-aqueous drilling fluid or well circulating fluid. Common NAF systems are diesel, mineral oil, or synthetic fluid based invert emulsions, or other non water based fluids. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
LWD

LWD

Definition(s)

LWD

Logging while drilling. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards Source: Deep Water Well Control  Guidlines. IADC Guidelines Source: NOGEPA Industrial Guideline No. 41, Well Construction Process Checklist, Drilling Best Practices, Netherlands, Version 0, December 2011. Global Standards Source: NORSOK D-010, Well integrity in drilling and well operations, Rev. 3, August 2004. Global Standards  

MWD/LWD

Management while drilling / logging while drilling. Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards
LT

LT

Definition(s)

LT

Low torque. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
Nippling Up

Nippling Up

Definition(s)

Nippling Up

The process of installing well-control or pressure-control equipment such as a BOP system. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
HWDP

HWDP

Definition(s)

HWDP

Heavy-weight drill pipe. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
HWAC

HWAC

Definition(s)

HWAC

Half-wave alternating current. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
FWAC

FWAC

Definition(s)

FWAC

Full-wave rectified alternating current. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
FSH

FSH

Definition(s)

FSH

Full screen height. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
FLUT

FLUT

Definition(s)

FLUT

Full-length ultrasonic transverse. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
FF

FF

Definition(s)

Ff

Primary structure design load due to forklift operation.

Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards

FF

Full face. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
dB

dB

Definition(s)

dB

Decibels. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  

dB

Decibel. Source: API SPEC 7-1, Specification for Rotary Drill Stem Elements, First Edition, March 2006 (Addendum April 2011). Global Standards  
Weight Code

Weight Code

Definition(s)

Weight Code

Unique numerical code for each outside diameter of drill pipe, normally stamped on the pin base and in the mill slot, which provides wall thickness and pipe body mass per unit length information. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
Sub

Sub

Definition(s)

Sub

Short, threaded piece of pipe used to connect parts for the drilling assembly for various reasons, such as crossing over to a different connection, or to save wear and tear on more expensive elements. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
Straight Sub

Straight Sub

Definition(s)

Straight Sub

Sub with no outside diameter change. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
Stabilizer

Stabilizer

Definition(s)

Stabilizer

Member of the drill stem assembly used to centralize or control the direction of the bottom-hole assembly. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards
Nippling Down

Nippling Down

Definition(s)

Nippling Down

The process of removing well-control or pressure-control equipment such as a BOP system. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
ND

ND

Definition(s)

ND

Nippling down. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
NAF

NAF

Definition(s)

NAF

Non-aqueous fluid. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards 
Mudline Suspension Wells

Mudline Suspension Wells

Definition(s)

Mudline Suspension Wells

A well drilled using a mudline suspension system and a surface blowout preventer (BOP). The mudline suspension well may be completed as either a surface well or as a subsea well. Source: API RP 90, Annular Casing Pressure Management for Offshore Wells, Upstream Segment. First Edition, August 2006. Global Standards

Mudline Suspension Wells

A well drilled using a mudline suspension system and a surface BOP. The mudline suspension well may be completed as either a surface well or as a subsea well. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  
Mudline Suspension System

Mudline Suspension System

Definition(s)

Mudline Suspension System

A casing suspension system that allows a well to be drilled using a surface BOP, surface wellhead and surface drilling equipment. The mudline suspension equipment provides for individual casing hangers to be installed with each casing string that interconnects with each other at a preset point below the mudline. The mudline suspension casing hangers do not provide a pressure barrier. After the well is drilled and cemented, these casing hangers allow for the removal of the casing string between the casing hanger and the surface wellhead. After these strings are removed, a cap can be placed over each casing string, isolating each casing string and the annular space between it and the previously capped casing string inside, at the casing hanger interface. These wells are tied back prior to the well completion in one of two methods: 1. Individually connecting two or more tie back casing production riser strings back to a surface casing head, tubing head/tubing hanger, and christmas tree (mudline surface well). Each string has its own tie-back connector, which provides a structural and pressure-containing connection between the casing strings below the mudline and the tie-back casing production riser string from the seafloor up to the surface. See Figure 13.1.3 in Appendix C. 2. Individually connecting two or more tie-back casing strings back to a subsea tubing head, using individual tie back connectors, followed by the installation of a subsea tubing hanger and subsea tree (mudline conversion well or mudline subsea well). See Figures 13.4.1 through 13.4.9 in Appendix C. Source: API RP 90, Annular Casing Pressure Management for Offshore Wells, Upstream Segment. First Edition, August 2006. Global Standards  

Mudline Suspension System

Drilling system consisting of a series of housings used to support casing strings at the mudline, installed from a bottom-supported rig using a surface BOP. Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global Standards  

Mudline Suspension System

A casing suspension system that allows a well to be drilled using a surface BOP and wellhead. The mudline suspension equipment provides for individual casing hangers to be installed with each casing string that interconnect with each other at a preset point below the mudline. The mudline suspension casing hangers do not provide a pressure barrier. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards
Mudline Packoff or Packer

Mudline Packoff or Packer

Definition(s)

Mudline Packoff or Packer

An upper packer run on the production tubing and set in the production casing below the mudline wellhead to isolate the production riser section from the production casing. This configuration is common in hybrid wells. Source: API RP 90, Annular Casing Pressure Management for Offshore Wells, Upstream Segment. First Edition, August 2006. Global Standards

Mudline Packoff or Packer

An upper packer run on the production tubing and set in the production casing below the mudline wellhead to isolate the production riser section from the production casing. These mechanical barrier devices are commonly installed in hybrid wells. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards