Oil and Gas Terms Beginning with "C"
85 terms
C pump
Definition coming soon.
CMC
Definition coming soon.
CMC-HVT
Carboxymethylcellulose of high viscosity type (HVT), a cellulose-derived polymer additive used to increase viscosity and reduce fluid loss in water-based drilling muds.
CMC-Hi Vis
High-viscosity carboxymethylcellulose, a water-soluble polymer used in drilling fluids to increase viscosity and provide filtration control in water-based muds.
CMC-LVT
Carboxymethylcellulose of low viscosity type (LVT), a cellulose-derived polymer used primarily as a filtration-control additive in water-based drilling muds where viscosity increase is not desired.
CMC-Lo Vis
Low-viscosity carboxymethylcellulose, a water-soluble polymer used primarily as a filtration-control agent in water-based drilling fluids with minimal effect on viscosity.
CMHEC
Definition coming soon.
CMP
Definition coming soon.
CMS
Definition coming soon.
CO2 injection
Definition coming soon.
COD
Definition coming soon.
COFCAW
Definition coming soon.
cable
Definition coming soon.
cable head
Definition coming soon.
cable-tool drilling
Definition coming soon.
cake
The solid layer of filter cake deposited on the wellbore wall when drilling fluid filtrate invades a permeable formation; filter cake quality and thickness are critical parameters that affect wellbore stability and completion success.
cake consistency
The physical texture and structural integrity of the filter cake deposited on the wellbore wall by a drilling fluid; a tough, rubbery cake is generally preferred over a soft, thick cake for minimizing differential sticking and maintaining wellbore stability.
cake thickness
A measurement of the filter cake deposited on the wall of the wellbore or test filter paper during a fluid loss test; thin, low-permeability filter cakes are desirable to minimize formation damage and differential pipe sticking.
calcite
Definition coming soon.
calcium bromide
Definition coming soon.
calcium carbonate
Definition coming soon.
calcium carbonate plug
Definition coming soon.
calcium chloride
Definition coming soon.
calcium contamination
Definition coming soon.
calcium hydroxide
Definition coming soon.
calcium mud
Definition coming soon.
calcium naphthenate
Definition coming soon.
calcium oxide
Definition coming soon.
calcium sulfate
Definition coming soon.
calcium test
Definition coming soon.
calibration
Definition coming soon.
caliche
Definition coming soon.
caliper log
Definition coming soon.
camera
Definition coming soon.
cap
Definition coming soon.
cap rock
Definition coming soon.
cap the well
Definition coming soon.
capacitance log
Definition coming soon.
capacitance meter
Definition coming soon.
cataclastic
Definition coming soon.
catagenesis
Definition coming soon.
cathead
Definition coming soon.
cathode
The negative terminal of an electrochemical cell; in cathodic protection systems used for pipelines and offshore structures, the cathode is the protected metal surface where reduction reactions occur, preventing corrosion.
clear-water drilling
Definition coming soon.
close in
To shut in a well by closing the blowout preventers or surface valves, stopping fluid flow; wells are closed in for pressure testing, well control situations, build-up tests, or to protect the wellbore during operations.
close-in
Definition coming soon.
closed chamber testing
A well testing method in which the wellbore is closed in at the surface or downhole immediately after a flow period, allowing pressure to build up in a sealed chamber to obtain accurate reservoir pressure data with minimal fluid production to surface.
closed in well
A well in which surface valves or BOPs have been shut, preventing flow of reservoir fluids to surface; closed-in conditions are used during pressure testing, well control events, and between production periods.
closed mud system
Definition coming soon.
closed-chamber testing
Definition coming soon.
closed-in well
Definition coming soon.
closing unit
Definition coming soon.
closure
Definition coming soon.
closure pressure
Definition coming soon.
cloud point
Definition coming soon.
cloud point glycol
A gas hydrate inhibitor used in subsea and deepwater pipelines; cloud point glycol refers to a glycol solution at its cloud point temperature, used to prevent hydrate and ice formation in production flowlines.
cluster
Definition coming soon.
cluster analysis
Definition coming soon.
coal
Definition coming soon.
coalesce
The process by which small dispersed droplets or gas bubbles in an emulsion or foam come together to form larger droplets or bubbles; in production operations, coalescence is promoted in separators and treaters to separate oil, water, and gas phases.
coalescence
Definition coming soon.
coarse
Definition coming soon.
coating
Definition coming soon.
coating flaw
Definition coming soon.
coding
Definition coming soon.
cogeneration
Definition coming soon.
coherence
Definition coming soon.
coherence filtering
Definition coming soon.
coherence map
Definition coming soon.
coherence vector map
Definition coming soon.
coherent
Definition coming soon.
coherent detection
A signal processing technique used in acoustic logging and seismic data interpretation in which signals from multiple receivers are compared and combined to detect coherent energy arrivals and distinguish formation signals from noise.
coherent noise
Definition coming soon.
contact angle
Definition coming soon.
contact time
Definition coming soon.
contaminant
Definition coming soon.
contamination gas
Definition coming soon.
continental shelf
The submerged extension of a continent beyond the shoreline, typically characterized by relatively shallow water depths (less than 200 meters) and gently sloping seafloor; continental shelves are prolific areas for offshore oil and gas exploration and production.
contingency plan
Definition coming soon.
continuity equation
Definition coming soon.
continuous gas lift
Definition coming soon.
continuous phase
In a multiphase fluid system such as an emulsion or foam, the continuous phase is the fluid that forms the surrounding medium in which droplets or bubbles of the dispersed phase are suspended; in oil-in-water emulsions, water is the continuous phase.
continuous reservoir
Definition coming soon.
contour
Definition coming soon.
contour interval
Definition coming soon.