WCS Glossary
WCS Glossary
- Abnormal Pressure
- Absolute Permeability
- Absolute Pressure
- Absolute Temperature
- Absolute Viscosity
- Absolute Zero Temperature
- Absorption
- Acceleration
- Accelerator
- Accredited Training
- Accumulator
- Acetic Acid
- Acetylene Welding
- Acid
- Acid Fracture
- Acid Treatment
- Acidity
- Acidize
- Acoustic Survey
- Active data
- Active Pits
- Actuators
- Adapter Spool
- Adequately Ventilated Area
- Adiabatic
- Adiabatic Efficiency
- Adjustable Choke
- Adjustable Spacer Sub
- Adsorption
- Advanced Geothermal System (AGS)
- Aeration
- Affinity Laws
- Aftercooler
- Agglomerate
- Aggregate
- Air Cutting
- Air-Tube Clutch
- Alkali
- Alkalinity
- Aluminum Stearate
- Ambient Temperature
- American Petroleum Institute (API)
- American Standard Code for Information Interchange (ASCII)
- Analysis, Mud Or Drilling Fluid
- Anchor
- Anchor Seal Assembly
- Angle Of Deflection
- Anhydrite
- Anhydrous
- Aniline Point
- Anion
- Annular Blowout Preventer
- Annular Friction Losses (AFL)
- Annular Pressure Loss (APL)
- Annular Space (Annulus)
- Annular Valve
- Annular Velocity
- Annulus Friction Pressure (AFP)
- ANSI
- Antifoam
- API Gravity
- Apparent Power
- Apparent Viscosity
- Aquathermal Event
- Aromatics
- Asbestos
- ASME
- Asphalt
- Atom
- Atomic Number
- Attapulgite Clay
- Automatic J
- Autoshear
- Back-In Unit
- Back Off
- Back-Pressure
- Back Pressure (BP) / Surface Back Pressure (SBP) / Surface Applied Back Pressure (SABP)
- Back-Pressure Limit
- Back-Pressure Valve
- Back Pressure Valve
- Back Up
- Back-Up Element
- Backpressure Valve (BPV)
- Backside
- Backup
- Bail
- Bailer
- Balance
- Balance, Mud
- Balance/Underbalance/Overbalance
- Ball
- Ball Catcher
- Ball Check Valve
- Ball Sealers
- Ball Valve
- Ballooning (Formation)
- Ballooning (Tubular)
- Barite (Barytes)
- Barite Plug
- Barrel
- Barrel Equivalent
- Barrel Per Day (B/D)
- Barrier
- Barrier Element (Well Barrier Element-WBE)
- Barrier Envelope (Well Barrier)
- Base
- Base Exchange
- Base Load
- Basket
- Basket Sub
- Battery
- Beam Pumping Unit
- Belching
- Bell Nipple
- Bent Sub
- Bentonite
- Bernoulli’s Equation
- Bernoulli’s Principle
- Best Efficiency Point (BEP)
- Bicarb
- Birddog
- Bit
- Bit Balling
- Blank Casing
- Blank Joint
- Blank Liner
- Blanking Plug
- Blast Joint
- Bleed
- Bleed Off Line
- Bleeding
- Bleeding-Off
- Blender
- Blind Drilling
- Blind Ram Preventer
- Blind Rams
- Blind/Shear Rams
- Block
- Block Valve
- Blooie Line
- Blow Down
- Blow Through
- Blowout
- Blowout Preventer (BOP)
- Blowout Preventer Control Panel
- Blowout Preventer Control Unit
- Blowout Preventer Drill
- Blowout Preventer Rams
- Blowout Preventer Stack
- Body Lock Ring
- Boiler
- Boll Weevil
- Bomb
- Bomb Hanger
- Bonnet
- Booster Pumps
- Boot Basket
- Borehole
- Borehole Pressure
- Bottom Drill
- Bottomhole Assembly (BHA)
- Bottomhole Choke
- Bottomhole Pressure (BHP)
- Bottomhole Pressure Gauge
- Bottoms-Up
- Bourdon Tube
- Bowtie
- Box
- Box Tap
- Bradenhead Squeezing
- Brake Band
- Brake Horsepower (BHP)
- Branch
- Break Circulation
- Break Out
- Breaking Down
- Breakout Cathead
- Bridge Plug
- Bridging Document
- Bridging Material
- Brine
- Bring In A Well
- Broaching
- Brownian Movement
- BTU
- Bubble Flow
- Bull Heading
- Bull Plug
- Bullet Perforator
- Bullheading
- Bumper Jar
- Bumper Sub
- Bumping Float
- Buoyancy
- Burn Over
- Bushing
- Butterfly Valve
- Button Slip
- Bypass
- Bypass Valve
- Cable Tool Drilling
- Cage
- Cake Thickness
- Calcium
- Calcium Carbonate (CaCO3)
- Calcium Chloride (CaCl2)
- Calcium Contamination
- Calcium Hydroxide (Ca(OH)2)
- Calcium Sulfate
- Calcium-Treated Muds
- Caliper Log
- Can-type Vertical Pumps
- Cap A Well
- Cap Rock
- Capacity
- Capacity Control
- Carbon Dioxide (CO2)
- Carrier Rig
- Cascade Shutdown
- Case Remote Warning (CRW)
- Cased Hole
- Casing
- Casing Burst Pressure
- Casing Coupling
- Casing Gun
- Casing Head
- Casing Pack
- Casing Patch Tool
- Casing Pressure
- Casing Roller
- Casing Running Tool (CRT)
- Casing Scraper
- Casing Seat Test
- Casing Shoe
- Cathead
- Cathodic Protection
- Catwalk
- Caustic Soda
- Cavings (Heaving or Spalling Shale)
- Cavitation
- Cavitation Index
- Cellar
- Cement
- Cement Bond Survey
- Cement Evaluation Logs (CEL)
- Cement Retainer
- Cementing
- Centralizer
- Centrifugal Compressor
- Centrifugal/Gear Pump
- Centrifugal Pump
- Centrifuge
- Centripetal Force
- Certified
- Chain Tongs
- Check Valve
- Chemical Cutoff
- Choke
- Choke Exercise
- Choke Line Friction
- Choke Manifold
- Choke Pressure
- Choked Flow
- Christmas Tree
- Circulate-And-Weight
- Circulating Head
- Circulation
- Clabbered
- Clean Out
- Clearance
- Close In
- Closed Returns System
- Closing Unit
- Coating
- Coefficient of Thermal Expansion
- Coiled Tubing
- Coiled Tubing BOP
- Collar
- Collar Locator
- Colloid
- Column Separation
- Comms Out
- Completion
- Completion Fluids
- Compressibility
- Compressible Fluid
- Compression Ratio
- Condensate
- Conductor Pipe
- Connate Water
- Connection Gas
- Consistency
- Constant
- Constant Bottom Hole Pressure (CBHP)
- Constant Choke Pressure Method
- Continuity Equation
- Continuous Annular Injection
- Continuous Circulation Drilling (CCD)
- Continuous Circulation Systems (CCS)
- Continuous Phase
- Control
- Control Panel, Master or Primary
- Control Panel – Remote or Secondary
- Control System
- Control Valve
- Controlled Mud Level (CML) & Dual Gradient Drilling (DGD)
- Converting the Casing (Float Collar)
- Cooling
- Core
- Coriolis Flow Meters (CFM)
- Corrosion
- Corrosive Gasses
- Coupling
- Crater
- Critical Flow
- Critical Point
- Critical Pressure Differential
- Critical Velocity
- Critical Zone
- Crossover
- Crown Block
- Crude Oil
- Cup Packer
- Cup Tester or Cup Packer
- Cuttings
- Cyclic Surging
- Cyclone
- Darcy
- Darcy Equation
- Dart Valve
- Dead Band
- Dead Well
- Deadman
- Deflection
- Defoamer
- Degasser
- Degree-day
- Degree of Tolerance
- Dehydration
- Dehydrator
- Densitometer
- Density
- Depthometer
- Derrick
- Derrickman
- Desander
- Design Capacity
- Design Pressure
- Design Thermal Analysis (DTA)
- Determined Viscosity
- Deviation
- Diameter
- Die Collar
- Differential Head
- Differential Pressure
- Direct Use
- Directional Drilling
- Discharge Control
- Discharge Nozzle
- Discharge Pressure
- Discharge Pressure Allowable
- Discharge Set Point
- Discharge Valve
- Displacement
- Displacement (compressor)
- Displacement Meter
- Displacement (pipe)
- District Heating
- Diverter
- Dog Leg
- Doghouse
- Dolomite
- Double
- Down Surge
- Downhole
- Downhole Pumping MPD
- Drafting
- Drag
- Drag Reducing Agents (DRAs)
- Drag Spring
- Draining
- Draw Works
- Drill Bit
- Drill Collar
- Drill Pipe
- Drill Ship
- Drill Stem
- Drill Stem Safety Valve
- Drill Stem Test
- Drill Stem Test (DST)
- Drill String
- Drillable
- Driller
- Driller’s Method
- Drilling Blind
- Drilling Fluid/Mud
- Drilling Fluids
- Drilling Spool
- Drilling Window
- Drills (Pit, Trip, Strip, Choke, Abandon, Diverter)
- Drooping Characteristic Curve
- Dry Gas
- Dry Hole
- Dual Completion
- Dual Gradient (DG)
- Dyna-Drill
- Dynamic Flow Check (DFC)
- Dynamic Fluid Flow
- Dynamic Formation Integrity Test (DFIT)
- Dynamic Head
- Dynamic Kill
- Dynamic Pore Pressure Test
- Effective Horsepower
- Effective Permeability
- Effectiveness
- Efficiency
- Elastomer Seals
- Electric Logging
- Electrolysis
- Elevation Head
- Elevation Pressure
- Elevation Profile
- Elevators
- Emergency Closure
- Emergency Disconnect System (EDS)
- Emergency Life Support Apparatus (ELSA)
- Emergency Shut Down (ESD)
- Emergency Shutdown Valves. (ESD)
- Emulsion
- End of Curve (EOC)
- Energy Consumption
- Enhanced Geothermal System (EGS)
- Entrained Gas
- Equal Percentage Valve
- Equalization Line or Loop
- Equalize
- Equivalent Circulating Density (ECD)
- Equivalent Mud Weight (EMW)
- Equivalent Static Density (ESD)
- Error Signal
- Established Reserves
- Ethane
- Euler’s Equation
- Expected Capacity
- Extended Reach Drilling (ERD)
- External Cutter
- Fault
- Feed-In
- Feedback Control System
- Fermentation
- Filter Cake
- Filtrate
- Final Circulating Pressure
- Final Control Element
- Fingerprinting
- Finite Element Analysis (FEA)
- Fish
- Fishing
- Flange
- Flapper Valve
- Flare Line
- Flare Stack
- Flash Point or Flashpoint
- Flash Set
- Flashing
- Flat Characteristic Curve
- Float Collar
- Float Shoe
- Flocculation
- Flood
- Flow
- Flow Back System
- Flow Characteristic
- Flow Chart
- Flow Check
- Flow Computers, Totalizers and Indicators
- Flow Control
- Flow Controllers
- Flow Cross
- Flow Diverter
- Flow Drilling
- Flow Indicators Sight
- Flow Line
- Flow Meter (Gas & Liquid Mass)
- Flow Meter (Gas & Liquid Velocity)
- Flow Meter Gas Volumetric
- Flow Meter Liquid Volumetric
- Flow Meters and Sensors
- Flow Sensors Air Velocity
- Flow Straightener
- Flow Switches Gas & Liquid Mass
- Flow Switches Gas & Liquid Velocity
- Flow Switches Gas Volumetric
- Flow Switches – Liquid Volumetric
- Fluid
- Fluid Barrier
- Fluid Flow
- Fluid Loss
- Flush Production
- FMEA
- Foam
- Formation
- Formation Damage
- Formation Fluid Pressure (Pore Pressure)
- Formation Fracturing
- Formation Integrity Test (FIT)
- Formation Pressure
- Formation Water
- Fracture Gradient
- Fracture Gradient (FG)
- Fracture Initiation Pressure (FIP)
- Fracture Pressure and Fracture Gradient
- Fracturing
- Free Point
- Free-Water Knockout
- Friction
- Friction Factor
- Friction Head Loss
- Frictional Pressure Loss
- Full Closing Isolation Valve (FCIV)
- Fundamental Flow Equation
- Funnel Viscosity
- Gage Joint
- Galena
- Gas
- Gas Anchor
- Gas Buster
- Gas Cut
- Gas-Cut Mud
- Gas Horsepower
- Gas Lift
- Gas-Lift Mandrel
- Gas Migration
- Gas-Oil Ratio
- Gate Valve
- Gauge Pressure
- Gel
- Gel Strength
- Geoexchange (Ground Source Heat Pumps)
- Geological Seal
- Geologist
- Geopressured
- Geopressured
- Globe Valve
- Glycol
- Go Devil
- Gooseneck
- Graph
- Graphical User Interface (GUI)
- Gravel Packing
- Gravitational Energy
- Gravitometer
- Gravity, Specific
- Guide Shoe
- Gumbo
- Gun-Perforate
- Gunk Plug
- Gusher
- Guy Line
- Gypsum
- Hang-Off
- Hanger
- Hard Shut-In
- Hardness (Of Water)
- Hazardous Gasses
- HAZID
- HAZOP
- Head
- Head-Capacity Curve
- Head Pressure
- Header
- Heat Exchanger
- Heater
- Heater-Treater
- Heaving
- Heaving Shale
- High Recovery Pressure Control Valve
- High Signal Converter
- Hoist
- Hole Stability Pressure:
- Hook
- Hook-Wall Packer
- Hopper, Jet
- Horsepower
- Host Rock
- Hot work
- HSE MPD
- Hunting
- Hydrate
- Hydration
- Hydraulic Fracturing
- Hydraulic Gradient (grade line)
- Hydraulic Head
- Hydraulic Horsepower
- Hydraulic Profile
- Hydraulic Workover Unit (HWO)
- Hydraulics
- Hydrocarbon
- Hydrochloric Acid
- Hydrogen Sulfide (H2S)
- Hydrostatic Head
- Hydrostatic Pressure
- Hydrothermal
- ID
- Immediately Dangerous To Life Or Health (IDLH)
- Impeller
- Impermeable
- Impression Block
- Incompressible Fluids
- Indirect Heater
- Induction Motor
- Inertia
- Influx Management Envelope (IME)
- Inhibitor
- Initial Circulating Pressure (ICP)
- Injection
- Injection Well
- Inside Blowout Preventer
- Instantaneous Measurement
- Instrument
- Intake Nozzle
- Interfacial Tension
- Interlocks
- Intermediate Casing String
- Internal Cutter
- Invert Oil-Emulsion
- Jar
- Jet
- Jet-Perforate
- Jetting the Well in
- Joint
- Junk
- Junk Basket
- Kelly
- Kelly Bushing
- Kelly Cock
- Kelly Valve Lower
- Kelvin
- Key Seat
- Kick
- Kick Intensity
- Kick Tolerance
- Kill
- Kill Line
- Kill Log
- Kill Rate
- Kill Rate Circulating Pressure
- Kill Weight Mud
- Kinematic Viscometer
- Kinematic Viscosity
- Kinetic Energy
- Lag Time
- Laminar Flow
- Landing Point (LP)
- Law of Conservation of Energy
- Lay Down Pipe
- Leak Detection
- Leak-Off Test (LOT)
- Lease
- Lignosulfonates
- Limestone
- Line Break Detector
- Line Fill
- Line Looping
- Line Pack
- Line Pack or linepack
- Line Section
- Linear Valve Flow Characteristic
- Liner
- Liquefied Natural Gas (LNG)
- Liquefied Petroleum Gas (LPG)
- Liquid
- Liquid Leak Detectors
- Live Well
- Load Factor
- Load Profile
- Load Shifting
- Log
- Look-ahead Model
- Loop
- Loop-Fill
- Loop Swing
- Looping
- Lost Circulation
- Low head
- Lower Explosive Limit (EL)
- Lower Explosive Limit (LEL)
- Lower Kelly Cock
- Lube and Bleed
- Lubricator Stack
- Macaroni String
- Magnet
- Make A Trip
- Man Machine Interface (MMI)
- Managed Pressure Drilling (MPD)
- Mandrel
- Manifold
- MAOP
- Marsh Funnel
- Mass
- Mast
- Master Bushing
- Master Choke Line Valve
- Master Gate
- MAWP
- Maximum Allowable Annular Surface Pressure (MAASP)
- Maximum Allowable Mud Weight (MAMW)
- Maximum Allowable Working Pressure (MAWP)
- Maximum Anticipated Static Bottomhole Temperature (MABHT)
- Maximum Anticipated Surface Pressure (MASP)
- Maximum Anticipated Wellhead Temperature (MAWHT)
- Maximum Expected Surface Pressure (MESP)
- Maximum Expected Wellbore Temperature (MEWT)
- Maximum Operating Pressure (MOP)
- Maximum Operational Surface Back Pressure (MOSBP)
- Maximum Planned Surface Injection Pressure (MPSIP)
- Maximum Safe Working Temperature (MSWT)
- Mean Effective Pressure
- Mean Pressure
- Mean Temperature
- Measurement While Drilling
- Mechanical Barrier
- Mechanical Efficiency
- Mechanical Energy
- Mechanical Jar
- Mechanical Losses
- Mechanical Vapor Plug
- Mechanical Work
- Membrane Nitrogen
- Meter
- Meter Banks
- Meter Factor
- Meter Multiplier
- Meter Prover
- Meter Run
- Meter Stack
- Metering
- Metering Manifold
- Methane
- Mica
- Mill
- Mist Drilling
- Momentum
- Montmorillonite
- Moody Diagram
- Motor
- Motor Actuators Electric/Electronic
- Mousehole
- Mpd Operations Matrix
- Mud
- Mud Acid
- Mud Balance
- Mud Cap
- Mud Density
- Mud Flow Indicator
- Mud Gas Separator
- Mud/Gas Separator (MGS)
- Mud Logging
- Mud Pit
- Mud Pump
- Mud Return Line
- Mud Weight
- Multi-Phase Flow
- Multi-stage Pump
- Multiphase / Low Head
- Multiple Completion
- Natural Gas
- Natural Gas Liquids (NGL)
- Near Balance
- Neat Cement
- Necking
- Needle Valve
- Negative Test
- Net Positive Suction Head Available (NPSHA)
- Net Positive Suction Head (NPSH)
- Net Positive Suction Head Required (NPSHR)
- Net Pumping Requirement
- Net Standard Volume
- Network
- Neutralization
- Newtonian Fluid
- Nipple
- Nipple Up
- Nitrogen
- Node
- Non-Aqueous Fluid (NAF)
- Non-Condensable Gasses (NCG)
- Non-Recoverable Energy
- Non-shearable
- Normal Circulation
- NPSHR Capacity Curve
- NRV
- Occupational Level Appropriate Well Control
- OD
- Off-line Model
- Offset Well
- Offshore Drilling
- Oil And Gas Separator
- Oil and Gas Separator
- Oil-Based Mud (OBM)
- Online Model
- Open Hole
- Operating Capacity
- Operating Limit
- Operating Point
- Operating Pressure
- Operator
- Optimization
- Optimizer
- Orifice
- Overburden
- Overshot
- Pack Off or Stripper
- Pack Off or Stripper Preventer
- Packer
- Packer Fluid
- Panhandle Formula
- Paraffin
- Parallel Operation
- Parasite (string, casing)
- Partial Pressure
- Parts Per Million (ppm)
- Pascal’s Laws
- Pay Zone
- Peak Shaving
- Penetration, Rate Of
- Perforate
- Perforating Gun
- Permeability
- Permissible Exposure Limit (PEL)
- Personal Protective Equipment (PPE)
- Ph
- PHA
- Piezometric Pressure
- Pig
- Pig (pigged)
- Pig Time
- Pill (or Pills)
- Pilot Hole
- Pilot Mill
- Pipe
- Pipe Leg
- Pipe Light/Pipe Heavy
- Pipe Prover
- Pipe Ram
- Pipe Work
- Piping and Instrumentation Diagram (P&ID)
- Piping & Instrumentation Diagram (P&ID)
- Pit Level
- Pit Volume Totalizer (PVT)
- Planned Limit
- Plastic Fluid
- Plastic Viscosity
- PLC
- Plug
- Plug Back
- Plug Valve
- Pocket (unloader)
- Polymer
- Pore Pressure
- Porosity
- Positive Choke
- Positive Test
- Potential Energy
- Potential or Head Energy
- Pounds Per Gallon (PPG)
- Pour Point
- Power Factor
- Power (p)
- Predictive Model
- Pressure
- Pressure Base (DATUM)
- Pressure Control
- Pressure Control Equipment (PCE)
- Pressure Control Equipment (PCE) Safety Margin
- Pressure Control Valve (PCV)
- Pressure Deployment
- Pressure Gradient
- Pressure Loss
- Pressure Relief Valve (PRV)
- Pressure Transient
- Pressure Transmitters
- Pressure Vessel -Phase Separation
- Pressurizable Mud Returns
- Pressurized Mud Cap Drilling (PMCD)
- Pressurized Mud Cap Drilling (PMCD)
- Pressurized Surge Tank
- Primary Barrier
- Primary Cementing
- Primary Location Instruments
- Primary Well Control
- Proactive MPD
- Process Disturbances
- Production
- Production Rig
- Productivity Index
- Propane
- Proportional Integral Derivative (PID)
- Proppant
- Pseudoplastic Fluid
- Pump
- Pump Capacity
- Pump Curve
- Pump Differential
- Pump Differential Head
- Pump Head
- Pump Head-capacity Curve
- Pump Horsepower Capacity Curve
- Pump Out Sub
- Pump Run Out
- Pump Station
- Pump Unit Lockout
- Pump Unit Shutdown
- Pumper
- Pup
- Purge
- PVR (Plant Volume Reduction)
- Quebracho
- Quenching Front
- Quick Opening Valve Flow Characteristic
- Rabbit
- Rack Pipe
- Radioactivity Well Logging
- Ram
- Ramping
- Rankine (degrees temperature)
- Rate of Penetration (ROP)
- Rate of Rise
- Rated Working Pressure (RWP)
- Rathole
- RCD System
- Reactive MPD
- Real-time Model
- Ream
- Reciprocating Compressor
- Reciprocating Pump
- Recoverable Energy
- Recycle Line
- Reeled Tubing
- Reeve
- Reference Level
- Regulator
- Relative Roughness
- Relief Valve
- Relief Well
- Remote Choke Panel
- Remote Control
- Remote Station
- Remote Terminal Unit (RTU)
- Remotely Operated Vehicle (ROV)
- Report by Exception
- Reservoir
- Reservoir Pressure
- Resistivity
- Responsible Party
- Retainer
- Retarder
- Return System
- Reverse Circulation
- Reynolds Number
- Rheology
- Rig
- Riser
- Riser Gas
- Riser Pipe
- Rising Characteristic Curve
- Risk Management
- Rock Matrix
- Roller-Cone Bit
- Rotary Drilling
- Rotary Hose
- Rotary Motion Valve
- Rotary Table
- Rotating Blowout Preventer
- Rotating Control Device (RCD)
- Rotating Diverter
- Rotating Head
- Roughneck
- Roughness
- Round Trip
- Roustabout
- Royalty
- RTU
- Rupture disc
- Sack
- Safety Joint
- Safety Margin (Drilling)
- Safety Margin (Intervention, PCE)
- Safety Rams
- Safety Valve
- Safety Valves (Pop-Offs)
- Salt
- Sample Catcher
- Samples
- Sand
- Sand Content
- Sand Line
- Sandstone
- Scraper
- Scraper Pig
- Screen Liner
- SCSSV
- Seat, Casing
- Secondary Barrier
- Secondary Cementing
- Secondary Well Control
- Sediment and Water (S&W)
- Seismograph
- Self-Contained Breathing Apparatus (SCBA)
- Self-Fill (Auto-Fill) Float
- Semi-Submersible Rig
- Sensor
- Separator
- Series Configuration
- Set Casing
- Set Point
- Shale
- Shale Shaker
- Shaped Charge
- Shear Ram
- Shear Strength
- Sheave
- Shipping Pumps
- Shoe
- Shoot
- Short-Term Exposure Limit (STEL)
- Shut In
- Shut-In Casing Pressure (SICP)
- Shut-In Drillpipe Pressure (SIDPP)
- Shut-In Tubing Pressure (SITP)
- Shut-off Head
- Shutdown Valves, Emergency
- SICP
- Sidetrack
- Sidewall Coring
- Sight Windows
- Simultaneous Operations (SIMOPS)
- Single
- Single Stage Pump
- Sinker Bar
- Skid
- Skin
- Slack Pipeline
- Slickline
- Slips
- Sloughing
- Slow Circulation Rate (SCR)
- Slug
- Slug Flow
- Slurry
- SMYS
- Snub
- Snubbing
- Snubbing Unit
- Sodium Bicarbonate
- Sodium Carbonate
- Sodium Chloride
- Sodium Hydroxide
- Soft Shut In
- Soft Shutdown
- Soft Start
- Solids Concentration
- Solids Control Equipment
- Solubility
- Sonic Flow Meter
- Sonic Logging
- Sonic Wave Speed
- Sour
- Sour Fluids (handling)
- Sour Gas
- Sour Water (handling)
- Source
- Space Out
- Spacer Spool
- Spear
- Specific Gravity
- Specific Heat
- Specific Heat Ratio
- Specific Speed
- Specific Weight
- Spider
- Spinning Chain
- Spitzglas Formula
- Spontaneous Potential (SP)
- Spud
- Square Law
- Squeeze
- SSV
- Stab
- Stabilizer
- Stack
- Stand
- Standard Temperature
- Standpipe
- Starch
- Startup/Shutdown
- Static
- Static Fluid Level
- Static Gradient
- Static Head
- Static Head Pressure
- Static Hydraulics
- Static Pressure
- Static Resistance
- Station Bypass
- Station Differential
- Station Suction Valve
- Steady State
- Steady State Analysis
- Steady State Energy Equation
- Steady State Model
- Stearate
- Steep Characteristic Curve
- Stimulation
- Stop Work Authority
- Storm Choke
- Strand (API Spec 9A)
- Stress Corrosion Cracking
- String
- Stripper Head
- Stripper Rubbers
- Stripper Well
- Stripping
- Stripping In
- Stripping Out
- Stuck Pipe
- Studded Block
- Stuffing Box
- Sub
- Subsurface Safety Valve
- Sucker Rod
- Sucker Rod Pump
- Suction Control
- Suction Pit
- Suction Pressure
- Suction Set Point
- Suction Valve
- Supervisory Control and Data Acquisition (SCADA)
- Supply
- Surface Backpressure (SBP)
- Surface Casing
- Surface Pressure
- Surface Tension
- Surfactant
- Surge Pressure
- Sustainable Capacity
- Swab
- Swab Pressure
- Swage
- Sweep
- Swivel
- System Curve
- Tally
- Tank Battery
- Tannic Acid
- Taper Tap
- Telescoping Derrick
- Temperature Corrected Rated Working Pressure (TCRWP)
- Temperature Survey
- Tension Tool
- Thermal Cracking
- Thermal Event/Thermal Kick
- Thermal Expansion
- Thermal Spalling
- Thinner
- Thixotropy
- Thread Protector
- Thribble
- Throughput
- Tie Downs
- Tight Formation
- Tight System
- Time Step
- Time-Weighted Average (TWA)
- Tongs
- Tool Joint
- Tool Pusher
- Torque
- Total Depth (TD)
- Total Energy Diagram
- Total Energy Head
- Total Energy Head Line
- Total Head
- Total Line Pressure
- Total Static Head Gradient
- Tour
- Toxic Gasses
- Traceability
- Transducer
- Transient
- Transient Analysis
- Transient Flow
- Transient Model
- Transit Time
- Transition Flow
- Transition Phase
- Transition Region
- Trapped Pressure and Trapped Gas
- Traveling Block
- Traveling Valve
- Tri-axial
- Trip
- Trip Gas
- Trip Margin
- Trip Sheet
- Tubing
- Tubing Displacement
- Tubing Head
- Tubular Buckling
- Tubular Goods
- Tungsten Carbide
- Tuning
- Turbine Meter
- Turbodrill
- Turbulent Flow
- Twist Off
- Two-Phase Flow
- U-Tube
- UBD Zone
- Ultimate Potential
- Ultraviolet Light
- Unconfined Compressive Strength (UCS)
- Underbalance
- Underbalanced
- Underbalanced Drilling
- Underbalanced Drilling (UBD)
- Underbalanced Operation (UBO)
- Underream
- Unloader
- Unsupported Length
- Upsurge
- Valence
- Valve
- Valve Actuators – General
- Valve Actuators Hydraulic/Electro-hydraulic
- Valve Actuators Manual
- Valve Actuators Pneumatic
- Valve Flow Coefficient
- Valve Position Indicators
- Valve Positioners
- Vapor Pressure
- Vaporization
- Variable Frequency Drive (VFD)
- Variable Speed Drive
- Velocity
- Velocity Transients
- Vena Contracta
- Venting (gases)
- Vertical Centrifugal Pump
- Vertical Inline Pumps
- Vibration
- Viscometer
- Viscosity
- Volatile Matter
- Volatility
- Volume
- Volumetric Method
- Vug
- Wafer Check Valve
- Wait and Weight Method
- Waiting On Cement (WOC)
- Wall Cake
- Wall Hook
- Washover Pipe
- Water-Based Mud
- Water Hammer
- Waterflood
- Weight
- Weight Cut
- Weight Indicator
- Weight Material
- Well Completion
- Well Geometry
- Well Integrity
- Well Intervention
- Well Logging
- Well Servicing
- Well Temperature Control Plan
- Wellbore
- Wellhead
- Wellsite Test Pressure
- Wet Gas
- Weymouth Formula
- Whipstock
- Wildcat
- Winch
- Wire Rope
- Wireline
- Wireline Operations
- Wireline Ram Assembly (WRA)
- Wireline Shear Seal Valve
- Wireline Valve (WCV)
- Work String
- Workover
- Yield
- Yield Point
- Yielding
- Z factor
- Zinc Chloride (ZnCl2)
- Zone
- Zoning