- المجال: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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A cheap, expendable, perhaps even disposable threaded shape to mate with threads on drillstring and casing components. Thread protectors prevent harmful impacts and other contact to the metal thread surfaces. Some protectors are strong enough and are fitted with lifting eyes so that they may be screwed into a joint of drillpipe, a drill collar or another component and a chain tied to the eye for lifting the joint. Except for this type, most of the other available styles of thread protectors are relatively inexpensive, being made from thermoplastics and various epoxy resins.
Industry:Oil & gas
A chemical analysis to measure the hardness ions in water-mud filtrates or in make-up water. Hardness is quantitatively determined by titration using standardized EDTA (versenate) reagent and ammonium hydroxide (weak) buffer, typically according to procedures of API. Results are reported as calcium ion in mg/L. The hardness ion Ca<sup>+2</sup> can be analyzed alone by another EDTA titration method described by the API.
Industry:Oil & gas
A chemical additive used to control the loss of fluid to the formation through filtration. In cementing operations, loss of the aqueous phase can severely affect the performance of the slurry and set cement. In almost any operation, loss of fluid to the reservoir formation carries a high risk of permeability damage.
Industry:Oil & gas
A check valve that has a spring-loaded plate (or flapper) that may be pumped through, generally in the downhole direction, but closes if the fluid attempts to flow back through the drillstring to the surface. This reverse flow might be encountered either due to a U-tube effect when the bulk density of the mud in the annulus is higher than that inside the drillpipe, or a well control event.
Industry:Oil & gas
A cement system exhibiting a bulk volumetric increase after setting. Expanding cement is commonly used to eliminate or minimize the effects of microannuli.
Industry:Oil & gas
A cellulose polymer that contains anionic carboxymethyl and nonionic hydroxyethyl groups added by ether linkages to the OHs on the cellulose backbone. This polymer has seen limited use in drilling mud, but more use in brines and completion fluids.
Industry:Oil & gas
A cement slurry made with less mix water than is customarily used without modifying additives.
Industry:Oil & gas
A cement in which the amount of tricalcium aluminate is controlled as specified by API Specification 10A.
Industry:Oil & gas
A cellulose derivative similar in structure, properties and usage in drilling fluids to carboxymethylcellulose. PAC is considered to be a premium product because it typically has a higher degree of carboxymethyl substitution and contains less residual NaCl than technical grade carboxymethylcellulose, although some PACs contain considerable NaCl.
Industry:Oil & gas
A cationic amine salt in which the nitrogen atom has four groups bonded to it and carries a positive charge. Quaternary amines are used as oil-wetting agents, corrosion and shale inhibitors and bactericides.
Industry:Oil & gas
