ISO 13628-4:2010 石油および天然ガス産業—海底生産システムの設計と運用—パート4：海底坑口および樹木設備 | ページ 6

3.1.1

annulus seal assembly

mechanism that provides pressure isolation between each casing hanger and the wellhead housing

3.1.2

backdriving

an unplanned movement in the reverse direction of an operation

3.1.3

backdriving

condition where the valve drifts from the set position

3.1.4

backdriving

condition where the valve changes position after the operator is disengaged

3.1.5

backdriving

condition where the valve continues to change position subsequent to the completion of a positional movement

3.1.6

backdriving

condition where the valve changes position after the operator is disengaged

3.1.7

bore protector

device that protects internal bore surfaces during drilling or workover operations

3.1.8

check valve

device designed to prevent flow in one direction

3.1.9

choke

equipment used to restrict and control the flow of fluids and gas

3.1.10

completion/workover riser

extension of the production and/or annulus bore(s) of a subsea well to a surface vessel

See ISO 13628-7.

3.1.11

conductor housing

top of the first casing string, which forms the basic foundation of the subsea wellhead and provides attachments for guidance structures

3.1.12

corrosion cap

cap placed over the wellhead to protect it from contamination by debris, marine growth or corrosion during temporary abandonment of the well

3.1.13

corrosion-resistant alloy

CRA

non-ferrous alloy for which any one or the sum of the specified amount of the following alloy elements exceeds 50 %: titanium, nickel, cobalt, chromium and molybdenum

Note 1 to entry: This term refers to corrosion-resistant alloys and not cracking-resistant alloys as mentioned in ISO 15156 (all parts).

3.1.14

corrosion-resistant material

CRM

ferrous or non-ferrous alloy that is more corrosion resistant than low-alloy steels

Note 1 to entry: This term includes: CRAs, duplex, and stainless steels.

3.1.15

depth rating

maximum rated working depth for a piece of equipment at a given set of operating conditions

3.1.16

downstream

direction of movement away from the reservoir

3.1.17

downstream

any item or assembly to which ISO 13628-4 is applicable

3.1.18

extension sub

sealing tubular member that provides tree-bore continuity between adjacent tree components

3.1.19

fail-closed valve

actuated valve designed to fail to the closed position

3.1.20

fail-open valve

actuated valve designed to fail to the open position

3.1.21

flowline

any pipeline connecting to the subsea tree assembly outboard the flowline connector or hub

3.1.22

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

3.1.23

flowline connector system

equipment used to attach subsea pipelines and/or control umbilicals to a subsea tree

3.1.24

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.)

3.1.25

guide funnel

tapered enlargement at the end of a guidance member to provide primary guidance over another guidance member

3.1.26

guideline

taut line from the seafloor to the surface for the purpose of guiding equipment to the seafloor structure

3.1.27

high-pressure riser

tubular member which extends the wellbore from the mudline wellhead or tubing head to a surface BOP

3.1.28

horizontal tree

tree that does not have a production master valve in the vertical bore but in the horizontal outlets to the side

3.1.29

hydraulic rated working pressure

maximum internal pressure that the hydraulic equipment is designed to contain and/or control

Note 1 to entry: Hydraulic pressure should not be confused with hydraulic test pressure.

3.1.30

hydrostatic pressure

maximum external pressure of ambient ocean environment (maximum water depth) that equipment is designed to contain and/or control

3.1.31

intervention fixture

3.1.32

intervention system

3.1.33

intervention tool

device or ROT deployed by an intervention system to mate or interface with an intervention fixture

3.1.34

lifting pad eye

pad eye, intended for lifting and suspending a designed load or packaged assembly

3.1.35

lower workover riser package

LWRP

unitized assembly that interfaces with the tree upper connection and allows sealing of the tree vertical bore(s)

3.1.36

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

3.1.37

orienting bushings

non-pressure-containing parts that are used to orient equipment or tools with respect to the wellhead

3.1.38

outboard tree piping

subsea tree piping that is downstream of the last tree valve (including choke assemblies) and upstream of flowline connection

3.1.39

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

3.1.40

pressure-containing part

part whose failure to function as intended results in a release of wellbore fluid to the environment

3.1.41

pressure-controlling part

part intended to control or regulate the movement of pressurized fluids

3.1.42

rated working pressure

RWP

maximum internal pressure that equipment is designed to contain and/or control

Note 1 to entry: Rated working pressure should not be confused with test pressure.

3.1.43

re-entry spool

tree upper connection profile, which allows remote connection of a tree running tool, LWRP or tree cap

3.1.44

reverse differential pressure

condition during which differential pressure is applied to a choke valve in a direction opposite to the specified operating direction

Note 1 to entry: This can be in the operating or closed-choke position.

3.1.45

running tool

tool used to run, retrieve, position or connect subsea equipment remotely from the surface

3.1.46

subsea BOP

blowout preventer designed for use on subsea wellheads, tubing heads or trees

3.1.47

subsea casing hanger

device that supports a casing string in the wellhead at the mudline

3.1.48

subsea completion equipment

specialized tree and wellhead equipment used to complete a well below the surface of a body of water

3.1.49

subsea wellhead housing

pressure-containing housing that provides a means for suspending and sealing the well casing strings

3.1.50

subsea wireline/coiled tubing BOP

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

3.1.51

surface BOP

blowout preventer designed for use on a surface facility such as a fixed platform, jackup or floating drilling on intervention unit

3.1.52

swivel flange

flange assembly consisting of a central hub and a separate flange rim that is free to rotate about the hub

Note 1 to entry:Type 17SV swivel flanges can mate with standard ISO type 17SS and 6BX flanges of the same size and pressure rating.

3.1.53

tieback adapter

device used to provide the interface between mudline suspension equipment and subsea completion equipment

3.1.54

tree cap

pressure-containing environmental barrier installed above production swab valve in a vertical tree or tubing hanger in a horizontal tree

3.1.55

tree connector

mechanism to join and seal a subsea tree to a subsea wellhead or tubing head

3.1.56

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

3.1.57

tree-side outlet

point where a bore exits at the side of the tree block

3.1.58

umbilical

hose, tubing, piping, and/or electrical conductor that directs fluids and/or electrical current or signals to or from subsea trees

3.1.59

upstream

direction of movement towards the reservoir

3.1.60

valve block

integral block containing two or more valves

3.1.61

vertical tree

tree with the master valve in the vertical bore of the tree below the side outlet

3.1.62

wear bushing

bore protector that also protects the casing hanger below it

3.1.63

wellhead housing pressure boundary

wellhead housing from the top of the wellhead to where the lowermost seal assembly seals

3.1.64

wye spool

spool between the master and swab valves of a TFL tree, that allows the passage of TFL tools from the flowlines into the bores of the tree