Oil and Gas Terms Beginning with “S” — Page 3

A sand trap is a vessel in a production surface facility designed to remove sand, proppant, and other coarse solid particles from produced fluids before those fluids enter downstream separation equipment, with the… Read more →

The physical interface between the formation and the wellbore. The diameter of the wellbore at the sandface is one of the dimensions used in production models to assess potential productivity. Read more →

A sandout is the premature termination of a hydraulic fracturing or gravel pack treatment caused by the bridging and packing of proppant (sand, ceramic, or bauxite particles) within the fracture or wellbore before the… Read more →

Sandstone is a clastic sedimentary rock composed primarily of sand-sized mineral grains (typically quartz, feldspar, and rock fragments in the 0.0625 to 2 millimeter diameter range) cemented together by mineral cements… Read more →

What Is Sandstone Petrography? Sandstone petrography is the microscopic study of the mineral composition, texture, grain size, fabric, and diagenetic history of sandstone reservoir rocks using thin sections cut from… Read more →

A sandstone porosity unit (abbreviated pu-ss or sometimes written as sandstone units) is a calibration convention for neutron porosity logs in which the tool's response is scaled to read apparent porosity directly in a… Read more →

Sandstone-compatible scale inhibitor (or sandstone-compatible scale treatment) refers to scale inhibition chemicals and application procedures specifically formulated to prevent mineral scale deposition in sandstone… Read more →

A platform on which surface multiphase pumps can be mounted and connected to subsea multiphase pumps. Read more →

A saturated solution is one in which the concentration of dissolved solute has reached the maximum that the solvent can hold at a given temperature and pressure, such that any further addition of solute will not… Read more →

The relative amount of water, oil and gas in the pores of a rock, usually as a percentage of volume. Read more →

The saturation equation is a mathematical expression used to calculate water saturation (Sw) in a porous rock formation from resistivity log measurements, with Archie's foundational formula expressing Sw as a function… Read more →

What Is the Saturation Exponent? The saturation exponent (n) is a dimensionless parameter in Archie's water saturation equation (Sw^n = F × Rw / Rt = a × Rw / (φ^m × Rt)) that describes how resistivity increases as… Read more →

A unit equal to the percentage of a given fluid in the total volume of a pore space. The term is abbreviated to s.u. and lies between 0 and 100. Read more →

What Is a Saver Sub? A saver sub is a short, sacrificial threaded sub installed between the kelly or top drive and the uppermost drill string joint, designed to absorb wear from repeated make-up and break-out operations… Read more →

What Is Scale in Oil and Gas Production? Scale in oil and gas production is the deposition of insoluble mineral salts from produced water or injected water onto wellbore tubulars, production equipment, perforations, and… Read more →

What Is a Scale Inhibitor? A scale inhibitor is a production chemistry additive, typically an organic phosphonate, polyacrylate, or phosphino-carboxylic acid compound, injected at very low concentrations into the… Read more →

A scale inhibitor squeeze is a production chemistry technique in which a concentrated solution of scale inhibitor is injected under pressure into the near-wellbore formation rock, where the inhibitor molecule adsorbs… Read more →

What Is Scale Removal in Oil and Gas? Scale removal is a well intervention or facility maintenance operation that physically or chemically dissolves, disperses, or mechanically dislodges mineral scale deposits from… Read more →

A scale inhibitor squeeze is a production chemistry technique in which a concentrated solution of scale inhibitor is injected under pressure into the near-wellbore formation rock, where the inhibitor molecule adsorbs… Read more →

A scallop gun is a perforating gun design in which recessed cavities (scallops) are machined into the outer surface of the gun body at each shaped charge position, providing a void space between the gun and the casing… Read more →

A scattergram, also called a scatter plot or crossplot in petroleum geoscience, is a two-dimensional graphical representation in which individual data points are plotted on Cartesian axes without connecting lines,… Read more →

A scavenger in oil and gas operations is a chemical compound or system designed to selectively react with and remove a specific unwanted component from a gas or liquid stream, converting it to a less harmful or inert… Read more →

A scintillation detector is a radiation detection device used in well logging tools that converts ionizing radiation (gamma rays, neutrons, or charged particles) into flashes of visible light within a scintillating… Read more →

To inspect an area or to monitor activity. Read more →

A brief report about a well from the time it is permitted through drilling and completion. A scout ticket typically includes the location, total depth, logs run, production status and formation tops. Read more →

(noun) A mechanical device run inside casing or tubing on drillpipe, wireline, or coiled tubing to remove scale, cement, rust, paraffin, or other deposits from the inner wall of the tubular, restoring full bore diameter… Read more →

Equipment placed in a pipeline for inserting or retrieving a pipeline scraper (pig). Read more →

A scratcher is a downhole cementing tool — a mechanical device mounted on the outside of the casing string — consisting of wire loops, spring-loaded blades, or rotating brush elements that scrape, agitate, and clean the… Read more →

(noun) A downhole filtering device installed across a producing interval to prevent the entry of formation sand into the wellbore while permitting the flow of reservoir fluids. Screens are manufactured in various… Read more →

In petroleum engineering, screening refers most commonly to the evaluation, selection, and deployment of sand control screens in oil and gas wells that produce unconsolidated or weakly consolidated formations — where… Read more →