- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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The angle of intersection of the interface between two fluids at a solid surface. It is measured from the solid surface through the water phase, or in an oil and gas test through the oil phase. <br><br>A contact-angle test uses carefully captured and preserved samples of reservoir oil to determine the wetting preference. A droplet of the crude oil is suspended between two parallel plates of quartz or calcite inside a simulated formation water bath at reservoir temperature and sometimes at reservoir pressure. By periodically displacing one of the plates sideways, a contact angle is determined at the side of the droplet where water is forcing the oil from the solid. A small angle indicates water-wetting preference while a large angle indicates oil-wetting. Angles near 90 are intermediate-wetting. Different minerals display different wetting preferences, although most are more likely to be water-wet.
Industry:Oil & gas
The analysis of pressure-transient behavior observed while the well is flowing. Results are generally much less accurate than those from pressure buildup tests because the bottomhole pressure fluctuates rapidly with even slight changes in the surface flow rate. Therefore, pressure buildup tests are much preferred, and analysis of drawdown test data is usually relegated to backup status unless the buildup data are flawed.
Industry:Oil & gas
The analysis of pressure changes over time, especially those associated with small variations in the volume of fluid. In most well tests, a limited amount of fluid is allowed to flow from the formation being tested and the pressure at the formation monitored over time. Then, the well is closed and the pressure monitored while the fluid within the formation equilibrates. The analysis of these pressure changes can provide information on the size and shape of the formation as well as its ability to produce fluids.
Industry:Oil & gas
The amount of time a liquid stays in a vessel. The retention time assures that equilibrium between the liquid and gas has been reached at separator pressure. The retention time in a separator is determined by dividing the liquid volume inside the vessel by the liquid flow rate. The retention time usually varies between 30 seconds and 3 minutes. If a foaming crude is present, the retention time could be increased by four times its normal values.
Industry:Oil & gas
The amount of production, after deducting cost oil production allocated to costs and expenses, that will be divided between the participating parties and the host government under the production sharing contract.
Industry:Oil & gas
Result of the evaluation aimed at characterizing the range within which the true value of a quantity is estimated to lie, generally with a given likelihood. (ISO)<br><br>The uncertainty is the amount of possible inaccuracy. It is often a statistical estimate of this range, such as the half-width of a gaussian distribution. The quantity may have been measured or derived from an equation.
Industry:Oil & gas
The amount of local personnel, material and services that working interest owners are required to employ when drilling and operating a well, as specified under the terms of a concession agreement.
Industry:Oil & gas
The amount of oil and gas expected to be economically recovered from a reservoir or field by the end of its producing life. Estimated ultimate recovery can be referenced to a well, a field, or a basin. <br>
Industry:Oil & gas
The amount of foreign personnel, material and services that working interest owners are permitted to employ, as defined under the terms of a concession when drilling and operating a well.
Industry:Oil & gas
The amount of acreage, determined by governmental authority that can be efficiently and economically drained by a well at a particular depth or horizon.
Industry:Oil & gas
