Valve Block

Valve Block

Definition(s)


Valve Block

Integral block containing two or more valves. 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  
Tree-Side Outlet

Tree-Side Outlet

Definition(s)


Tree-Side Outlet

Point where a bore exits at the side of the tree block. 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
Tree Guide Frame

Tree Guide Frame

Definition(s)


Tree Guide Frame

Structural framework that may be used for guidance, orientation and protection of the subsea tree on the subsea wellhead/tubing head, and that also provides support for tree flowlines and connection equipment, control pods, anodes and counterbalance weights. 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
Tree Connector

Tree Connector

Definition(s)


Tree Connector

Mechanism to join and seal a subsea tree to a subsea wellhead or tubing head. 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
Tree Cap

Tree Cap

Definition(s)


Tree Cap

Pressure-containing environmental barrier installed above production swab valve in a vertical tree or tubing hanger in a horizontal tree. 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
Tieback Adapter

Tieback Adapter

Definition(s)


Tieback Adapter

Device used to provide the interface between mudline suspension equipment and subsea completion equipment. 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
Surface BOP (SBOP)

Surface BOP (SBOP)

Definition(s)


Surface BOP

Blowout preventer designed for use on a surface facility such as a fixed platform, jackup or floating drilling on intervention unit. 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  
Subsea Wireline/Coiled Tubing BOP

Subsea Wireline/Coiled Tubing BOP

Definition(s)


Subsea Wireline/Coiled Tubing BOP

Subsea BOP that attaches to the top of a subsea tree to facilitate wireline or coiled tubing intervention. 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  
Subsea Wellhead Housing

Subsea Wellhead Housing

Definition(s)


Subsea Wellhead Housing

Pressure-containing housing that provides a means for suspending and sealing the well casing strings. 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  
Subsea Completion Equipment

Subsea Completion Equipment

Definition(s)


Subsea Completion Equipment

Specialized tree and wellhead equipment used to complete a well below the surface of a body of water. 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  
Subsea Casing Hanger

Subsea Casing Hanger

Definition(s)


Subsea Casing Hanger

Device that supports a casing string in the wellhead at the mudline. 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  
Subsea BOP

Subsea BOP

Definition(s)


Subsea BOP

Blowout preventer designed for use on subsea wellheads, tubing heads or trees. 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  
Reverse Differential Pressure

Reverse Differential Pressure

Definition(s)


Reverse Differential Pressure

Condition during which differential pressure is applied to a choke valve in a direction opposite to the specified operating direction. NOTE This can be in the operating or closed-choke position. 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
Permanent Guidebase

Permanent Guidebase

Definition(s)


Permanent Guidebase

Structure that sets alignment and orientation relative to the wellhead system and provides entry guidance for running equipment on or into the wellhead assembly. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards
Outboard Tree Piping

Outboard Tree Piping

Definition(s)


Outboard Tree Piping

Subsea tree piping that is downstream of the last tree valve (including choke assemblies) and upstream of flowline connection. See flow loop (3.1.24). Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards
Orienting Bushings

Orienting Bushings

Definition(s)


Orienting Bushings

Non-pressure-containing parts that are used to orient equipment or tools with respect to the wellhead. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards
Lower Workover Riser Package (LWRP)

Lower Workover Riser Package (LWRP)

Definition(s)


Lower Workover Riser Package (LWRP)

Unitized assembly that interfaces with the tree upper connection and allows sealing of the tree vertical bore(s). 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
Lifting Pad Eye

Lifting Pad Eye

Definition(s)


Lifting Pad Eye

Pad eye, intended for lifting and suspending a designed load or packaged assembly. 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
Intervention Tool

Intervention Tool

Definition(s)


Intervention Tool

Device or ROT deployed by an intervention system to mate or interface with an intervention fixture. 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
Intervention System

Intervention System

Definition(s)


Intervention System

Means to deploy or convey intervention tools to subsea well equipment to carry out intervention tasks, including ⎯ ROV; ⎯ ROT; ⎯ ADS; ⎯ Diver. 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
Intervention Fixture

Intervention Fixture

Definition(s)


Intervention Fixture

Device or feature permanently fitted to subsea well equipment to facilitate subsea intervention tasks including, but not limited to, ⎯ grasping intervention fixtures; ⎯ docking intervention fixtures; ⎯ landing intervention fixtures; ⎯ linear actuator intervention fixtures; ⎯ rotary actuator intervention fixtures; ⎯ fluid coupling intervention fixtures. 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
Hydraulic Rated Working Pressure

Hydraulic Rated Working Pressure

Definition(s)


Hydraulic Rated Working Pressure

Maximum internal pressure that the hydraulic equipment is designed to contain and/or control. NOTE Hydraulic pressure should not be confused with hydraulic test pressure. 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
High-Pressure Riser

High-Pressure Riser

Definition(s)


High-Pressure Riser

Tubular member which extends the wellbore from the mudline wellhead or tubing head to 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
Guide Funnel

Guide Funnel

Definition(s)


Guide Funnel

Tapered enlargement at the end of a guidance member to provide primary guidance over another guidance member. 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    
Flow Loop

Flow Loop

Definition(s)


Flow Loop

Piping that connects the outlet(s) of the subsea tree to the subsea flowline connection and/or to other tree piping connections (crossover piping, etc.). 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    
Flowline Connector System

Flowline Connector System

Definition(s)


Flowline Connector System

Equipment used to attach subsea pipelines and/or control umbilicals to a subsea tree. EXAMPLE Tree-mounted connection systems used to connect a subsea flowline directly to a subsea tree, connect a flowline end termination to the subsea tree through a jumper, connect a subsea tree to a manifold through a jumper, etc. 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    
Flowline Connector Support Frame

Flowline Connector Support Frame

Definition(s)


Flowline Connector Support Frame

Structural frame which receives and supports the flowline connector and transfers flowline loads back into the wellhead or seabed anchored structure. 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    
Fail-Open Valve

Fail-Open Valve

Definition(s)


Fail-Open Valve

Actuated valve designed to fail to the open position. 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  
Wetted Surface

Wetted Surface

Definition(s)


Wetted Surface

Any surface that has contact with pressurized well fluid, either by design or because of internal seal leakage. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Wetted Surface

Any surface which will be in contact with pressurized well fluid either by design or because of internal seal leakage. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards
Well

Well

Definition(s)


Well

"Well"
  1. means a hole penetrating the earth, usually cased with steel pipe, and
    1. from which oil or gas, or both, or geothermal resources, is obtained or obtainable; or
    2. that is made for the purpose of finding or obtaining oil, gas, or geothermal resources, or of supporting oil, gas, or geothermal resources production; and
  2. includes a well with multiple well branches drilled to different bottom-hole locations.
Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. Regulations  

Well

“Well” means any borehole, whether drilled or bored, for stratigraphic exploration or for the production, extraction or injection of any gas or liquid mineral, excluding potable water to be used as such, but including natural or artificial brines and oil field waters, sewage, and any liquid used in or resulting from any process of industry, manufacture, trade, business, or agriculture. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Well

“Well” means any borehole, whether drilled or bored, within the state, for production, extraction, or injection of any gas or liquid mineral, excluding potable water to be used as such, but including natural or artificial brines and oil field waters. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Well

“Well" means any opening in the ground (not being a seismic shot hole) that is made, is to be made or is in the process of being made, by drilling, boring or other method,
  1. for the production of petroleum,
  2. for the purpose of searching for or obtaining petroleum,
  3. for the purpose of obtaining water to inject into an underground formation,
  4. for the purpose of injecting gas, air, water or other substance into an under ground formation,
  5. for any purpose, if made through sedimentary rocks to a depth of at least one hundred and fifty metres.
Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. Legislation Source: Drilling and Production Guidelines, The Canada-Nova Scotia Offshore Petroleum Board and Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada, March 31, 2011. Regulatory Guidance Source: Canada Oil and Gas Operations Act, R.S.C., 1985, c. O-7, Canada, current to April 29, 2013. Legislation  

Well

Well―all wells drilled within the confines of any unit(s) sought to be terminated. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. Regulations

Well

Well includes all equipment located downhole from a well. Examples:
  1. Equipment leading to a blow-out preventer.
  2. Equipment leading to a well head.
  3. Equipment leading to a Christmas Tree.
Source: Offshore Petroleum and Greenhouse Gas Storage (Resource Management and Administration) Regulations 2011 (Select Legislative Instrument 2011 No. 54 as amended), Australia, prepared on 1 January 2012. Regulations  

Well

Well means a hole in the seabed or subsoil made by drilling, boring or any other means in connection with:
  1. exploration for petroleum; or
  2. petroleum recovery operations; or
  3. exploration for potential greenhouse gas storage formations; or
  4. exploration for potential greenhouse gas injection sites; or
  5. the injection of a greenhouse gas substance into an identified greenhouse gas storage formation; or
  6. the injection, on an appraisal basis, of a greenhouse gas substance into a part of a geological formation; or
  7. the injection, on an appraisal basis, of air, petroleum or water into a part of a geological formation;
but does not include a seismic shot hole. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. Legislation  

Well

Well includes well-related equipment associated with a well. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. Legislation  

Well

WELL when used alone in these Rules and Regulations, shall mean an oil or gas well, a hole drilled for the purpose of producing oil or gas, a well into which fluids are injected, a stratigraphic well, a gas storage well, or a well used for the purpose of monitoring or observing a reservoir. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. Regulations  

Well

“Well” means a well bore with single or multiple completions, including all horizons and producing formations from the surface to total depth. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations  

Well

A well drilled for any purpose related to exploration for or production or storage of oil or gas or geothermal resources, including a well drilled for injection of fluids to enhance hydrocarbon recovery, disposal of produced fluids, disposal of waste from exploration or production activity, or brine mining. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations  

Well

A well as defined in Texas Natural Resources Code, Chapter 89. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations  

Well

a well made by drilling; and a borehole drilled with a view to the extraction of minerals through it or another well Regulation 2, DCR. Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards  

Well

"Well" means a hole in the ground:
  1. made, or being made, by drilling, boring, or in any other manner, and from which oil or gas is obtained, or is obtainable; or is for the purpose of attempting to obtain oil or gas;
  2. made, or being made, by drilling or boring for the purpose of obtaining water to inject to an underground formation;
  3. used, drilled, or being drilled for the purpose of injecting gas, air, water or other substance to an underground formation;
  4. which is a test-hole, excluding seismic drilling; or
  5. drilled or being drilled, for any other purpose than listed above using equipment and machinery normally used for oil and gas well drilling.
Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations  

Well

“Well” includes any borehole associated with that well. Source: The Borehole Sites and Operations Regulations 1995, UK S.I. 1995/2038, 1995. Regulations  

Well

Well. A well is any area on the deck exposed to the weather, where water may be entrapped. Wells are considered to be deck areas bounded on two or more sides by deck structures. <Chapter I, regulation 3>. Source: IMO Resolution MSC.143(77), amendments to Annex B to the 1988 Load Lines Protocol, 5 June 2003, International Maritime Organization. Legislation  

Well

Well: borehole taken into service following construction, fitting-out and completion. Source: Mining Regulation of the Netherlands, WJZ 02063603, Netherlands,16 December 2002. Regulations  

Well

Well—
(a) means a borehole drilled for the purpose of exploring for, appraising, or extracting petroleum; and
(b) includes—
(i) any borehole for injection or reinjection purposes; and
(ii) any down-hole pressure containing equipment; and
(iii) any pressure-containing equipment on top of the well well intervention operation means an operation in which a well is re-entered for a purpose other than to continue drilling or to maintain or repair it. Source: Health and Safety in Employment (Petroleum Exploration and Extraction) Regulations 2013, SR 2013/208, New Zealand, as of May 2013. Regulations