Coiled Tubing Glossary...

Hardness (Testing): Testing of the hardness of a material.

Hardness: A measure of the hardness of a metal as determined by pressing a hard steel bar or diamond penetrator into a smooth surface under standard conditions.

Helical Spiral: This term describes the manner in which the coiled tubing is lying in the well i.e. similar to a spring. The situation occurs as a result of forces opposing the direction of RIH such that the rigidity of the coiled tubing is not sufficient to overcome them and the coiled tubing conforms to the shape of the completion with 3600 wall contact.

Hematite: an iron oxide used as a weighting material in percentages by weight of cement.

Hesitation Squeeze: a sub-classification of squeeze cementing that can be used in either high or low-pressure applications.

High-pressure Squeeze Cementing: the forcing of cement slurry into a well at the points to be sealed with a final pressure equal to or greater than the formation break-down pressure.

Hipp Tripper: See percussion hammer.

Horsepower: (hp) A measure of the amount of work done by a machine, equal to 550 ft-lb per second.

Hydrate: to cause to combine with water.

Hydraulic Cement: a cement that hardens or sets under water.

Hydraulic Fracturing: The forcing into a formation of fluids under high pressure to open passages for oil and gas to flow through and into the wellbore.

Hydraulic Horsepower: (hhp) A measure of energy required to move a fluid at a given rate and pressure.

Hydril: Registered trademark of a prominent manufacturer of oilfield, equipment especially annular blowout preventers.

Hydrochloric Acid: A compound commonly used to acidize carbonate rocks. Also known as Muratic acid. Chemical symbol is HCl.

Hydrostatic Head: The pressure exerted by a column of fluid.

Hydrostatic Pressure: The pressure exerted by a column of fluid.

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