- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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A point within the wellbore from which accurate depth measurements can be made, such as the end of the tubing string, or a nipple or similar completion component.
Industry:Oil & gas
A poisonous liquid acid composed of hydrogen and fluorine. Hydrofluoric acid (HF) is used primarily because it is the only common, inexpensive mineral acid that can dissolve siliceous minerals. HF is typically mixed with hydrochloric acid (HCl) or organic acid to keep the pH low when it spends, thereby preventing detrimental precipitates. These mixtures, also called mud acids, are considered the main fluid in a sandstone acid treatment because they remove formation damage. <br><br>Hydrofluoric acid should not be used in sandstone formations with high carbonate content because of the high risk of calcium fluoride precipitation (CaF<sub>2</sub>).
Industry:Oil & gas
A plug, or sample, taken from a conventional core for analysis. Core plugs are typically 1 in. To 1 1/2 in. (2. 5 to 3. 8 cm) in diameter and 1 in. To 2 in. (5 cm) long. Core plugs are ordinarily cut perpendicular to the axis of the core or parallel to the axis, called horizontal and vertical plugs, respectively, when cut from a vertical wellbore. The terms horizontal and vertical are often applied for cores cut from a deviated or horizontal wellbore, even though they are not strictly correct unless core orientation is measured and plugs are cut to the true in-situ orientation.
Industry:Oil & gas
A pocket-size thread gauge used in field operations to correctly identify or confirm the thread type and size of tubular goods.
Industry:Oil & gas
A plug made from barite weighting materials that is placed at the bottom of a wellbore. Unlike a cement plug, the settled solids do not set solid, yet a barite plug can provide effective and low-cost pressure isolation. A barite plug is relatively easy to remove and is often used as a temporary facility for pressure isolation or as a platform enabling the accurate placement of treatments above the plug.
Industry:Oil & gas
A plug of cement or similar material placed as a slurry in a specific location within the wellbore and which has set to provide a means of pressure isolation or mechanical platform. For correct placement, the volume of slurry and the displacement fluid must be carefully calculated and measured. The correct volume ensures that the column of fluid in the tubing string is balanced by the column of fluid in the annulus.
Industry:Oil & gas
A plot representing the effect of invasion on resistivity measurements that have different depths of investigation. The plot assumes a step-profile model of invasion and determines true resistivity, flushed zone resistivity and diameter of invasion from ratios of deep-, medium- and shallow-resistivity measurements. Strictly speaking, when both resistive invasion and conductive invasion are plotted, the chart is called a butterfly chart. When only one is plotted, it is known as a tornado chart.
Industry:Oil & gas
A plot of the longitudinal component of the dip vector computed from a dipmeter. Longitudinal plots are used in the SCAT (Statistical Curvature Analysis Technique) method of interpreting dipmeter data for geological structure. They are especially useful in doubly plunging dip situations.
Industry:Oil & gas
A plot representing the effect of invasion on resistivity measurements that have different depths of investigation. The plot assumes a step profile model of invasion and determines true resistivity, flushed zone resistivity and diameter of invasion from ratios of deep-, medium- and shallow-resistivity measurements. Strictly speaking, when both resistive and conductive invasion are plotted, the chart is called a butterfly chart. When only one is plotted it is known as a tornado chart.
Industry:Oil & gas
A plot of real gas pseudopressure (pseudopotential) m(p) versus time function used to analyze gas-well drawdown and buildup tests. The use of the real gas pseudopressure linearizes the diffusion equation for gas flow. This form enables rigorous analysis over all pressure ranges. The pressure-squared plot can be used for low pressure (p < ~2000 psi), and pressure can be used to analyze gas-well tests at high pressure (p > ~3000 psi).
Industry:Oil & gas
