A drilling fluid, see hematite

A downhole tool centralizer that is engaged by raising hydraulic pressure.

An acid compound, hci, commonly used to acidize carbonate rocks.

It is prepared by mixing hydrogen chloride gas in water.

Also known as muriatic acid.

Absorbing or attracting moisture from the air

See mechanical jar

A sub with a ball seat run on top of a hydraulically set packer to set the packer.

A wireline pressure setting tool for setting permanent downhole tools.

The break down of a mineral by chemical reaction with water.

A designation that is given for basic compounds containing the oh radical.

When these substances are dissolved in water, they increase the ph of the solution.

See base.

A flammable, colorless gaseous compound of hydrogen and sulfur (h2s) , which in small amounts has the odor of rotten eggs.

Sometimes found in petroleum, it causes the foul smell of petroleum fractions.

In dangerous concentrations, it is extremely corrosive and poisonous, causing damage to skin, eyes, breathing passages, and lungs and attacking and paralyzing the nervous system, particularly that part controlling the lungs and heart.

In large amounts, it deadens the sense of smell.

Also called hepatic gas of sulfureted hydrogen.

A measure of the acidity or alkalinity of a solution expressed as ph.

See ph.

An expressions of the relative attraction of an emulsifier for water and oil, determined largely by the chemical composition and ionization characteristics of a given emulsifier.

The hlb of an emulsifier is not directly related to solubilit5y, but it determines the type of emulsion that tends to be formed.

It is an indication of the behavioral characteristics and not an indication of emulsifier efficiency.

Tending to repel water

Tending to absorb water.

Mixture of acids used for removal of mud from the wellbore.

See mud acid.