Oil and Gas Terms Beginning with “C” — Page 11

What Is Conductance? Conductance (also called electrical conductance or formation conductance) is the measure of how easily an electrical current passes through a material, defined as the reciprocal of electrical… Read more →

What Is Conductive Invasion? Conductive invasion (also called negative invasion or low-resistivity invasion) is a well log interpretation condition in which drilling mud filtrate that has displaced native formation… Read more →

What Is the Conductive Rock Matrix Model? Conductive rock matrix model (also called the CRM or clay conductance model) is a petrophysical framework for shaly sandstone formations that accounts for the electrical… Read more →

What Is Conductivity in Well Log Interpretation? Conductivity (also called electrical conductivity or formation conductivity) is a measure of a material's ability to pass an electric current, expressed in siemens per… Read more →

Conductometric titration is an analytical chemistry technique used in drilling fluid evaluation in which the electrical conductivity of a mud or filtrate sample is continuously measured as a titrant solution is added… Read more →

What Is a Conductor Pipe? Conductor pipe (also called surface conductor, drive pipe, or structural casing) is the largest-diameter, shallowest casing string installed in a well before drilling begins. It is driven,… Read more →

What Are Conformable Strata? Conformable strata (also called conformable beds or a conformable sequence) are rock layers deposited in an uninterrupted sequence without significant erosion, tilting, or time gap between… Read more →

What Is Conformity in Geology? Conformity (also called stratigraphic conformity or a conformable contact) is a stratigraphic relationship in which adjacent rock strata were deposited continuously and without significant… Read more →

A conical projection in cartography is a map projection method in which the surface of the Earth (or a portion of it) is projected onto a cone that is placed over or securely tangent to the globe, with the cone… Read more →

What Is Coning? Coning is the upward encroachment of water or downward migration of gas into the wellbore of an oil producer, caused by the pressure sink created by the producing well. In a layered reservoir where oil… Read more →

What Is Connate Water? Connate water (also called irreducible water, interstitial water, or formation water) is the ancient water trapped within the pore spaces of a reservoir rock since the time of original deposition… Read more →

What Is a Drilling Connection? Drilling connection (also called making a connection or adding a stand) is the routine process of adding a new joint or stand of drill pipe to the drill string when the kelly or top drive… Read more →

What Is Connection Gas? Connection gas (also called connection gas show or pump-off gas) is a detectable increase in gas concentration measured at the shale shaker or surface gas detector — typically expressed in gas… Read more →

What Is Consistency in Drilling Fluids and Cementing? Consistency (also called Bearden Consistency or slurry consistency ) is a dimensionless measure of a fluid's resistance to flow, used specifically in well cementing… Read more →

What Is a Consistometer? Consistometer (also called a pressurized consistometer or high-pressure high-temperature consistometer) is a laboratory instrument used in well cementing to simulate the temperature and pressure… Read more →

What Is a Consolidated Formation? Consolidated formation (also called competent rock or indurated rock) is a subsurface rock unit in which grains are cemented or interlocked by diagenetic processes — including silica… Read more →

What Is a Constant Composition Expansion? Constant composition expansion (also called constant mass expansion or flash liberation) is a pressure-volume-temperature (PVT) laboratory test performed on a reservoir fluid… Read more →

What Is a Constant-Rate Drawdown Test? Constant-rate drawdown test (also called a constant-rate flow test or drawdown pressure transient test) is a pressure transient well test in which a well is produced at a… Read more →

What Is a Contact Angle? Contact angle (also called wettability angle or interfacial angle) is the angle at which a liquid-liquid or liquid-gas interface meets a solid surface, measured through the denser fluid phase,… Read more →

What Is Contact Time? Contact time (also called displacement contact time or flush contact time ) is the duration, measured in seconds or minutes, during which a cement slurry or pre-flush fluid remains in contact with… Read more →

In drilling and well completion engineering, a contaminant is any chemical compound, formation fluid, or foreign material that unintentionally enters an engineered fluid system — drilling mud, cement slurry, stimulation… Read more →

What Is Contamination Gas? Contamination gas (also called cuttings gas or background cuttings gas) is gas released from the pore space of formation cuttings and cavings as they are mechanically disaggregated by the… Read more →

A contingency plan in oil and gas operations is a pre-established set of documented procedures, resources, and responsibilities for responding to abnormal or emergency situations that could interrupt normal operations,… Read more →

What Is the Continuity Equation? The continuity equation (also called the mass balance equation or conservation of mass equation ) is a fundamental partial differential equation expressing the principle that the rate of… Read more →

What Is Continuous Gas Lift? Continuous gas lift (also called continuous flow gas lift) is an artificial lift method in which high-pressure injection gas is continuously injected down the production tubing-casing… Read more →

What Is a Continuous Reservoir? A continuous reservoir (also called a continuous accumulation or unconventional accumulation ) is a hydrocarbon-bearing formation that lacks a definable downdip water contact,… Read more →

(noun) A line drawn on a map connecting points of equal value for a given property, such as depth, thickness, pressure, porosity, or hydrocarbon saturation. Contour maps are fundamental tools in subsurface mapping for… Read more →

What Is a Contour Interval? Contour interval (also called map contour spacing or contour step) is the constant vertical distance — measured in feet or meters of depth or elevation — between successive contour lines on a… Read more →

What Is a Contour Map? Contour map (also called a structural map or isoline map) is a two-dimensional representation in which lines of equal value connect points of identical elevation, depth, thickness, or reservoir… Read more →

What Is Contract Depth? Contract depth (also called objective depth or well depth specification) is the total vertical depth (TVD) or measured depth (MD) stipulated in a drilling contract at which the drilling… Read more →