- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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The depth at which a tubing or coiled tubing string that is stuck in the wellbore is free to move. When the tubing string must be cut to enable recovery, the free point should be known to ensure retrieval of the cut tubing. This enables remedial action to be taken to resolve the sticking mechanism on the portion of the string below the cut.
Industry:Oil & gas
The density of carbon in oil. This density affects the interpretation of the carbon-oxygen log. The term may also be used for the density of carbon in other materials.
Industry:Oil & gas
The degree to which a medium resists the flow of electric charge, defined as the ratio of the electric displacement to the electric field strength. It is more common to use the relative dielectric permittivity.
Industry:Oil & gas
The connection between the wireline logging cable and the bridle. The torpedo consists of an outer mechanical connection enclosing electrical connections between the conductors.
Industry:Oil & gas
The condition of an environment in which free oxygen is lacking or absent.
Industry:Oil & gas
The condition of an environment in which free oxygen is lacking or absent.
Industry:Oil & gas
The condition in which cement flows in a channel only on some sides of the casing or borehole annulus, and thus does not provide adequate hydraulic isolation in all radial azimuths. The channel frequently manifests itself as an intermediate amplitude signal on a cement bond log. Pulse-echo tools are able to detect a channel because they measure the cement bond at different azimuths.
Industry:Oil & gas
The concentration of organic material in source rocks as represented by the weight percent of organic carbon. A value of approximately 0. 5% total organic carbon by weight percent is considered the minimum for an effective source rock, although values of 2% are considered the minimum for shale gas reservoirs; values exceeding 10% exist, although some geoscientists assert that high total organic carbon values indicate the possibility of kerogen filling pore space rather than other forms of hydrocarbons. Total organic carbon is measured from 1-g samples of pulverized rock that are combusted and converted to CO or CO<sub>2</sub>. If a sample appears to contain sufficient total organic carbon to generate hydrocarbons, it may be subjected to pyrolysis.
Industry:Oil & gas
The components of a snubbing unit that provide the vertical stroke or movement required to run or retrieve the work string. Snubbing jacks are hydraulically operated and can apply extremely high forces to the tubing string and the wellhead to which they are attached.
Industry:Oil & gas
The comparatively short shut-in period following the initial flow period of a drillstem test. This period is followed immediately by much longer flow and shut-in periods to allow the pressure to closely approach initial reservoir pressure. The initial flow period is commonly 5 to 10 minutes, and the initial shut-in period is commonly 30 minutes to one hour. When plotted on a pressure buildup plot, extrapolation of the best straight line gives what is usually accepted as the best obtainable value of initial formation pressure.
Industry:Oil & gas
