Page 500 - Practical Well Planning and Drilling Manual

Appendix NEW! revised 11/00/bc 1/30/01 3:30 PM Page 476

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Glossary

Filling the Hole. Pumping drilling fluid continuously or intermit-
tently into the wellbore to maintain the fluid level in the hole near
the surface. The purpose is to avoid danger of blowout, water intru-
sion and/or caving of the wellbore.

Fill-Up or Fillup Line. The line through which fluid is added to the
hole, usually into the flow nipple.

Filter Cake. The suspended solids that are deposited on a porous
medium during the process of filtration. See also Cake Thickness.

Filtercake Thickness. A measurement of the solids deposited on fil-
ter paper in 32nd of an inch during the standard 30-min API filter
test. See also Cake Thickness. In certain areas the filtercake thickness
is a measurement of the solids deposited on filter paper for a 7h min.
duration.

Filter Paper. Porous unsized paper for filtering liquids. API filtration
test specifies one thickness on 9-cm filter paper, Whatman No. 50, S
& S No. 576, or equivalent.

Filter Press. A device for determining fluid loss of a drilling fluid
having specifications in accordance with API RP 13B.

Filtrate. The liquid that is forced through a porous medium during
the filtration process. See also Fluid Loss.

Filtration. The process of separating suspended solids from their liq-
uid by forcing the latter through a porous medium. Two types of fluid
filtration occur in a well; dynamic filtration while circulating and sta-
tic filtration when at rest.

Finger Board. A rack located in the derrick to contain the top of the
stands of pipe while they are stacked in the derrick.

Fishing. Operations on the rig for the purpose of retrieving from the
well bore sections of pipe, collars, bit cones, junk, or other obstruc-
tive items which are in the hole.

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