دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: any chemical compound. one element of which is hydrogen, that dissociates in solution to produce free hydrogen ions. For example, hydrochloric acid. HCI, dissociates in water to produce hydrogen ions, H+, and chloride ions, CI-. This reaction is expressed chemically as HCI + H+ + CI- . See ion.

a reactive material with a low pH. Common oilfield mineral acids are HCl and HCl/HF.

use of a mineral acid (typically HCl or HCl/HF) or an organic acid (typically acetic or formic) to remove damage or stimulate the permeability of a formation.

n: a substance capable of reacting with an acid to form a salt. A typical base is sodium hydroxide (caustic),with the chemical formula NaOH. For example, sodium hydroxide combines with hydrochloric acid to form sodium chloride (a salt) and water. This reaction is written chemically as NaOH + HCl -+ NaCI + H2O.

see hydrochloric acid.

chlorine dioxide, a bacteria killer.

n: a mixture of hydrochloric and hydrofluoric acids and surfactants used to remove wall cake from the wellbore.

n: also called earth acid, it is mixture of hydrogen chloride, hydrogen fluoride and surface acting agent.




an inexact term, usually meaning a mixture of hydrochloric (HCl) and hydrofluoric acid (HF),HCL/HF. HF will dissolve some silicates and some of the components of drilling mud.

n: the topmost portion of a string of sucker rods. It is used for lifting fluid by the rod-pumping method. It has a uniform diameter and is smoothly polished to seal pressure effectively in the stuffing box attached to the top of the well.

a surface rod pup joint that slides through the stuffing box on a beam pumped well. The part is highly polished and generally chrome plated. It must not be exposed to HCl acid.