Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
PIV
Definition(s)
PIV
Production isolation valve. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global StandardsPL
Definition(s)
PL
Protection level. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global StandardsPL
Point load. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsPlain End
Definition(s)
Plain-End Pipe
Pipe without threads or tool-joint. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsPlain End
Drill pipe, tubing, or casing without threads. The pipe ends may or may not be upset. Source: API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits, Upstream Segment, Sixteenth Edition, August 1998 (Addendum 2: September 2009). Global StandardsPlain-End Pipe
Definition(s)
Plain-End Pipe
Pipe, either upset or non-upset, furnished without threads. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsPlaintext
Definition(s)
Plaintext
Unencrypted information. From: CNSSI 4009. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsPlaintext
Unencoded data that is input to and transformed by an encryption process, or that is output by a decryption process [11]. Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National StandardPlan Approval
Definition(s)
Plan Approval
Staff personnel authorized to carry out plan approval and to conclude whether or not compliance has been met. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsPlan Approval
Signifies a systematic and independent examination of drawings, design documents or records in order to verify compliance with the rules or statutory requirements. Plan approval will be carried out at the discretion of the society, which also decides the extent and method of examination. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsPlan/planned
Definition(s)
Plan/planned
A set of intended actions, including timescales and resources, required to achieve an objective. Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global StandardsPlanar Imperfection
Definition(s)
Planar Imperfection
Imperfection lying in one geometric plane that is normally parallel to, and within, the outer and inner surfaces. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsPlastic Collapse
Definition(s)
Plastic collapse
Load that causes overall structural instability; the onset of gross plastic deformation. NOTE 1 Plastic collapse load is calculated with elastic-plastic material properties. NOTE 2 Plastic collapse is calculated using methods such as ASME BPVC, Section VIII, Division 2, Paragraph 5.2.4 or ASME BPVC, Section VIII, Division 3, Paragraph KD-230 using a true stress–strain material model. Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global StandardsPlastic Viscosity
Definition(s)
Plastic Viscosity
Measure of the high-shear-rate viscosity which depends upon the number, shape and size of solids and the viscosity of the liquid phase. NOTE Plastic viscosity is calculated by subtracting the 300 r/min concentric cylinder viscometer reading from the 600 r/min concentric cylinder viscometer reading (see ISO 10414-1 and ISO 10414-2). Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global StandardsPlate Lining
Definition(s)
Plate lining
Metal plates that are welded to the inside of the pressure vessel wall. Normally, plates are of a more corrosion resistant or erosion resistant alloy than the vessel wall and provide additional corrosion/erosion resistance. In some instances, plates of a material of construction similar to the vessel wall are used for specific operating periods where corrosion and/or erosion rates are predictable. Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global StandardsPlatform
Definition(s)
Platform
complete assembly, including structure, topsides, foundations and stationkeeping systems. Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global StandardsPlatform
“Platform” means a platform associated with an installation (plate-forme). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsPlatform
Production platform. Source: NOGEPA Guideline 14, Helideck Operations and Procedures Manual, Netherlands, Version 2, December 2011. Global StandardsPlating
Definition(s)
Plating
Deposition of a thin layer of metal onto a surface by techniques such as electroless or electroplating, vapor deposition, and sputter deposition. Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsPLC
Definition(s)
PLC
Principal loading condition. Source: API SPEC 8C, Drilling and Production Hoisting Equipment (PSL 1 and PSL 2), Fifth Edition, April 2012. Global StandardsPLC
Programmable logic controller. Source: IADC UBO / MPD Glossary, December 2011. Global Standards Source: ISO 13702:2015, Petroleum and natural gas industries — Control and mitigation of fires and explosions on offshore production installations — Requirements and guidelines, Second Edition, August 2015. Global Standards Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National StandardPLEM
Definition(s)
PLEM
Pipeline end manifold. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global StandardsPLET
Definition(s)
PLET
Pipeline end termination. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global StandardsPLET
Pipeline end modulus. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global StandardsPLS
Definition(s)
PLS
Plastic limit state. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global StandardsPLT
Definition(s)
PLT
production logging tool. Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsPlug
Definition(s)
Plug
A device or material which may be temporarily or permanently placed in the wellbore to block off or isolate lower zones so that upper zones may be completed, stimulated, tested, cemented, produced, or injected into. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global StandardsPlug
"Plug" means the closing off, in a manner prescribed by the Commission, of all oil, gas, and waterbearing formations in any producing or nonproducing wellbore before such well is abandoned. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsPlug and Abandon
Definition(s)
Plug and Abandon
Placement of a cement plug or plugs in a well, in which no future utility has been identified, to seal the entire wellbore against fluid migration, and protect fresh water aquifers from contamination. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global StandardsPlug Back
Definition(s)
Plug Back
To place cement or other material in the well to seal off a completion interval, to exclude bottom water, or to perform another operation such as side-tracking or producing from another depth. The term also refers to the setting of a mechanical plug in the casing. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global StandardsPlug Back Total Depth
Definition(s)
Plug Back Total Depth (PBTD)
The new bottom of a well that is established when a well is plugged back. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global StandardsPlug Cementing
Definition(s)
Plug Cementing
Process of placing a volume of cement in a well to form a plug across the wellbore. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global StandardsPlug Valve
Definition(s)
Plug Valve
Valve assembly with a plug permanently mounted across the conduit so that, when rotated 90°, it effects a closure. EXAMPLES Plugs may be straight, tapered, ball, etc. Source: API RP 17A Addendum 1, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, December 2010. Global StandardsPlug Valve
Wedge shaped, reduced part valve with 90- degree rotation; causes high-pressure drop. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsPlugging
Definition(s)
Plugging
Wedging or jamming of openings in a screening surface by near-size particles, preventing passage of undersize particles and leading to the blinding of the screen (see blinding). Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global StandardsPM
Definition(s)
PM
Preventive maintenance. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global StandardsPM
Preventative Maintenance. Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC GuidelinesPMCD
Definition(s)
PMCD
Pressurized Mud Cap Drilling. Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global StandardsPMCD
A drilling technique used to drill without returns while balancing a full annular fluid column by using a Light Annular Mud (LAM) cap maintained above an open-hole formation that is taking all injected (sacrificial) fluid and drilled cuttings assisted by surface pressure. The LAM density is chosen based on ability to make LAM and the desired surface pressure that can be maintained and observed. Periodically injecting more of the same fluid into the annulus provides a means to control the surface back-pressure within the operating limits of the RCD and/or riser system. Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global StandardsPMI
Definition(s)
PMI
Positive material identification.Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards
PMI
Any physical evaluation or test of a material to confirm that the material, which has been or will be placed into service, is consistent with the selected or specified alloy material designated by the owner/user.- NOTE: These evaluations or tests can provide qualitative or quantitative information that is sufficient to verify the nominal alloy composition (see API 578).