C&P

C/K (drilling)

C Annulus

C Factor

Cable

Cable Head

Cable Tool Rig

CaBr2 (CaBr₂)

CaCl2 (CaCl₂)

CaCO3 (CaCO₃)

Caisson (pipe)

Cake

Calcareous Coating

Calcite

Calcium Bromide

Calcium Carbonate

Calcium Chloride

Calcium Hydroxide

Calcium Oxide

Calcium Reducers

Calcium Sulfate

Calcium Treated

Calibration

Caliche

Caliper Log

Cambrian

CAOF

CAP

Cap A Well

Cap Rock

Capacitance Tool

CAPEX

Capillary

Capillary Action

Capillary pressure

Capillary Pressure Curve

Capillary String

Capital Asset

Capital cost or expenditure

Carbide Blast Joint

Carbon Dioxide

Carbon/Hydrogen Ratio

Carbon-Oxygen Log

Carbon Sequestration

Carbon Steel

Carbonate

Carbonic Acid

Carboniferous

CarboProp(tm)

Carboxymethyl Starch

Carboxyl Methyl, Hydroxy Methyl Cellulose

Carboxy Methyl Cellulose

Carburizing

Carried Interest

Carrier Fluid

Carrying Capacity

Cartridge Filter

Case Hardened

Cased and Perforated

Cased Hole Gravel Pack

Cased Hole Log

Casing

Casing-Annular Pressure

Casing Centralizer

Casing Cladding

Casing Collar Log

Casing Coupling

Casing Grade

Casing Gun

Casing Hanger

Casing Head

Casing Head Gas and Gasoline

Casing Inspection Log

Casing Jacks

Casing Joint

Casing Liner

Casing Patch

Casing Plunger

Casing Point

Casing Pressure

Casing Reciprocation

Casing Roller

Casing Rotation

Casing Scraper

Casing Seat

Casing Seat Test

Casing Shoe Test

Casing String

Casing Swage or Broach

Casing Valve

Casing Tongs

Casing Wear

Casing Weight

CaSO4 (CaSO₄)

Cast Iron Bridge Plug

Cat Head

Cat Line

Cat Walk

Catenary Riser

Catalyst

Cathode

Cathodic Corrosion

Cathodic Protection

Cation

Cation Exchange Capacity

Cationic Surfactant

CATs (subsea)

Caustic

Cavings

Cavitation

Cavity Completion

Cavings Rock

CBHFP (rock mechanics)

CBHT

CBJ

CBL

CBM

CBT

CCDST

CCL

CCP (completion)

CCP (compression)

CCT

CD (contract)

CDL

CDP

CDP (rock mechanics)

CDR (flow)

CDR (logging)

CE

CEC

CEL

Cell Spar

Cellar

Celloflake

Cement (completions)

Cement and Cementation (formation)

Cement Accelerator

Cement Bond

Cement Bond Log

Cement Channel

Cement Packer

Cement Plug

Cement Poison

Cement Pump Time

Cement Retainer

Cement Retarder

Cementing Head

Cementation

Cementation Exponent

Cementing Head

Cenozoic

Centipoise

Centralizer

Centrifugal Pump

Centrifuge

CERCLA Certs

Cessium Acetate

Cessium Formate

CET

CF

Cfd

CFD (fluids)

CFE

CFPP

CFH

CFR

CG

CGA

CGF

CGR

Chain Tongs

Chalcedony

Chalk

Chamber Lift

Channel (cement)

Channel (formation)

Chat

Cheater

Check Shot Survey (seismic)

Check Trip

Check Valve

Checking (corrosion)

Chelant

Chemical cutter

Chemical Dissolution

Chemical Flooding

Chemical Resistance

Chemical Sediment

Chemical Treating

CHEMRAZ(tm)

CHFR(tm)

Cherry Picker (fishing)

Chert

CHESS

Chevron packing (seal)

Chevron Pattern (corrosion)

CHFP

CHGP

Chicksan(tm)

Chisel Bit

CHK

CHKS (rig up)

CHKS

Chloride Stress Cracking

Chlorinated Hydrocarbons

Chlorine Dioxide

Chlorine Log

Chlorite

Choke

Choke Bean

Choke Line

Choke Manifold

Choke Trim

CHOPS

Christmas Tree

Chromatogram

Chrome Tubing

Churn Flow

CIBHP

CIBP

CID (subsea)

CIM

CIRC

Circulate

Circulate and Weight Method

Circulating Pressure

Circulation Charge

Circulation Control Valve

Circulation Losses

Circulation Squeeze

Circulation Sub

Circulation Valve

CIT (corrosion)

CIT (pressure test)

CIT (subsea)

CIT-OA

Citric Acid

CIV (completion)

CIV

CIWHP

CL

ClampOn(tm) Sand Detector

Clamshell Marks (failure/crack development)

Class A Cement

Class C Cement

Class E and F Cements

Class G and H Cements

Clastic

Clay

Clay-Bound Water

Clay Extender

Clay Flocculation

Clay Migration

Clay Swelling

Clean Circulation (drilling)

Clean Oil

Cleanout

Clear Brine

Cleat Fracture (in coal)

CLFP

Clinker

Clintoptolite

ClO2 (ClO₂)

Close In

Closed Chamber Testing

Closing Ratio

Closure (fracture)

Cloud Point (Paraffin)

CLW (SSSV)

CMC

CMHPG

CMIT – TxIA

CMIT – IAxOA

CMIT – TxIAxOA

CMP (depth)

CMS

Cmt

CMTD

CNG

CNL

CO

CO2 (CO₂)

CO2 Injection (CO₂ Injection)

Coagulation

Coal

Coal Bed Methane

Coal Gas

Coal gasification

Coal liquefaction

Coalescence

Coarse

Coating

Coating Holiday

Coccolith

COD

COE

COFCAW

Cogeneration

Cohesion

Coiled Tubing

Coiled Tubing Completion

Coiled Tubing Connector

Coiled Tubing Drilling

Coiled Tubing Injector Head

Coiled Tubing Unit

Coke

Cold Finger Test

Cold Flow

Cold Treating

Coleman Equation

Collapse Pressure

Collapse Rating

Collar

Collar Lock

Collar Log

Collar Stop

Collett

Collett Connector (coiled tubing)

Collett Lock

Collider

Collision

Colloid

Colloidal Suspension

Combination Log

Combination Trap

Combustible Limits (fuel gas)

Commercial Production Level

Commingle

Common Carrier (petroleum)

Common Process

Communication

Compaction

Compaction Drive

Company Man (drilling)

Compartmentalization

Compartments

Completion Bore Protector (subsea)

Compatible Brine

Completed Well

Completion Fluid

Completion Interval

Completion Technical Limits

Complex Well

Compliant Expansion

Composite Bridge Plug

Composite Log

Compressibility

Compressional Wave

Compression Ratio

Compression-Set Packer

Compressor

Compton Scattering

CONCAWE

Concentric Completion

Concentric Operations

Concentric Tubing

Concentric Tubing Workover

Concession (lease)

Conchoidal Marks (failure/crack development)

Concurrent Method

Condensate

Condensate Banking

Condensed Water

Condition the Mud

Conductance

Conduction Heat Transfer

Conductive Concrete

Conductivity (fracture flow)

Conductor Pipe

Confining Bed

Confining Pressure Confirmation Well

Conformation Well

Conformity

Confusion Block

Conglomerate

Coning

Connate water

Connection Gas

Consequence (Risk)

Consistency

Consistometer

Consolidated

Consortium

Constant Choke-Pressure Kill Method

Contact

Contact Angle

Contaminant (cementing)

Contingency String (casing design)

Content (fuel)

Continental Margin

Continental Shelf

Contingent Resources

Continuous Flow Gas Lift

Continuity

Continuous Phase

Contour

Contracted Reserves

Control Head

Control Gas

Control Line

Convection Heat Transfer

Convective Mixing

Conventional Crude Oil

Conventional Energy Sources

Conventional Gas

Conveyance (well work)

COPAS (accounting)

Copolymer

Core

Core Analysis

Core Barrel

Core Diameter (coiled tubing reel)

Corkscrew

Correlate

Corrosion

Corrosion Coupon

Corrosion-Erosion

Corrosion Fatigue

Corrosion Film

Corrosion Inhibitor

Corrosion Potential (Ecorr) (Corrosion Potential (E_corr))

Corrosion Resistant Alloy

Corrosion Resistant Ring Groove

COST Well

Counter Weights

Coupling

Coupon

CP (casing)

CPS

CPT (corrosion)

CQG

Cr

CRA

Crack a Valve

Cracking (refining)

Crater (blow out)

Cratering or Sloughing

Crazing

Creaming of Emulsions

Creep

Crest (geology)

Crest (flow)

Cretaceous

Crevice Corrosion

Crew

CRI (solids handling)

CRI (structure)

Critical (flow)

Critical Buckling Load

Critical Components

Critical Drawdown

Critical Failure

Critical Flow Rate (biofilm)

Critical Flow Rate (corrosion/erosion)

Critical Flow Rate (liquids unloading)

Critical Flow Rate (sand production)

Critical Saturation

Critical Temperature

Critical Velocity (erosion)

Critical Velocity (unloading)

Crooked Hole

Cross Dipole

Cross Flow

Cross Plot

Crosslinked

Crossover (gravel packing)

Crossover Sub

Crosswell Tomography

Crown

Crown Block

Crown Lands

Crown Plugs (subsea)

CRP (rock mechanics)

Crude and Crude Oil

Crude Oil Equivalent

Crush Zone

Crystallation Temperature

CsCOOH

CSD(tm)

Csg

CSS

CST

CT

CTD

CTDESP

CTE

CTL

CTR

CTU

Cumulative Production

Cup Packer

Curie Point

Curing Agent

Cushion (underbalance)

Cushion Gas

Cut

Cut and Strip

Cut Fluid

Cut Lip Guide

Cut-Off tool

Cutrite

Cuttings

CV

CVAR (subsea)

CVP

CVT

CWA

CWI (contract)

CWOP

CWOR

CWTF

Cycle Gas

Cycle Time (drilling)

Cycle Time (plunger)

Cyclone

Cyclonite