دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: material of high specific gravity formed during the chemical refining treatment of oils by sulphuric acid and usually separable by settling or centrifuging. Also called acid tar.

n: see acid sludge.

v: to treat oil-bearing limestone or other formations with acid for the purpose of increasing production. Hydrochloric or other acid is injected into the formation under pressure. The acid etches the rock, enlarging the pore spaces and passages through which the reservoir fluids flow. Acid also removes formation damage by dissolving material plugging the rock surrounding the wellbore. The acid is held under pressure for a period of time and then pumped out, after which the well is swabbed and put back into production. Chemical inhibitors combined with the acid prevent corrosion of the pipe. acid recovery plant n: plant for therecovery of sulfuric acid from acid sludge.

n: a European term for a plumb bob that is attached to a metal dip tape and that is of sufficient weight to keep the tape taut and of such shape as to facilitate the penetration of any sludge that might be present on the datum plate of a tank. Also called outage bob.

valence state +3 iron in solution. A very common catalyst in oil field emulsion and sludge formation. Precipitates at iron hydroxide when the pH exceeds 1.8 to 2.2 (depending on sour conditions).

n: any quantity that produces a sheen, sludge, film, or discoloration of the surface water in navigable US waters.

a chemical that helps reduce the valiance state of iron from iron+3 (ferric) to iron +2 (ferrous) in non sour applications. Helps prevent sludges that are triggered by iron and asphaltic crude in combination with salt water or acid. May also help prevent

n: (remaining on board) the measurable material remaining on board a vessel after a discharge. Includes measurable sludge, sediment, oil, and water or oil residue lying on the bottom of the vessels cargo compartments and in associated lines and pumps.

n: (OBQ) the measurable or estimatable materialsincluding water, oil, slops, oily residue, oil/ water emulsion, sludge, and sedimentremaining on board in vessel cargo tanks and pipe lines prior to loading.