Oil & Gas Glossary 1.0
OIL & GAS TECHNICAL TERMS GLOSSARY
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Search Result for Initial Gel Strength
flat gel
A condition wherein the 10-minute gel strength is substantially equal to the initial gel strength.
initial gel
See initial gel strength.
shearometer
An instrument used to measure the shear strength, or gel strength, of a drilling fluid. See gel strength
initial gel strength
The maximum reading (defletion) taken from a direct-reading viscometer after fluid has been quiescent for 10 seconds. It is reported in pounds per 100 square feet. See API-RP13B for details of test procedure.
tensile strength
The greatest longitudinal stress that a metal can bear without tearing apart. A metal's tensile strength is greater than its yield strength.
gel strength
A measure of the ability of a colloidal dispersion to develop and retain a gel form, based on its resistance to shear. The gel, or shear, strength of a drilling mud determines its ability to hold solids in suspension. Sometimes bentonite and other colloidal clays are added to drilling fluid to increase its gel strength.
ten-minute gel strength
The measured 10-min gel strength of a fluid is the maximum reading (deflection) taken from a direct-reading viscometer after the fluid has been quiescent for 10 minutes. The reading is reported in lb/100 sq. ft. See API RP 13B for details of test procedure.
shear strength
See gel strength
peptized clay
A clay to which an agent has been added to increase its initial yield
production test
A test of the well's producing potential usually done during the initial completion phase
initial circulating pressure (ICP)
The pressure at which a well that has been closed in on a kick is circulated when well-killing procedures are begun
recompletion
After the initial completion of a well, the action and techniques of reentering the well and redoing or repairing the original completion to restore the well's productivity.
surge loss
The flux of fluids and solids that occurs in the initial stages of any filtration before pore openings are bridged and a filter cake is formed. Also called spurt loss.
chemicals
In drilling-fluid terminology, a chemical is any material that produces changes in the viscosity, yield point, gel strength, fluid loss, and surface tension.
spurt loss
The initial loss of mud solids by filtration, making formations easier to drill. See filtration loss.
stormer viscometer
A rotational shear viscometer used for measuring the viscosity and gel strength of drilling fluids. This instrument has been largely superseded by the direct-indicating viscometer.
dispersion
2. of aggregates, subdivision of aggregates. Dispersion increases the specific surface of the particle; hence, it results in an increase in viscosity and gel strength.
safety factor of wire rope
B=nominal catalog breaking strength of the wire rope, and
pole mast
A portable mast constructed of tubular members. A pole mast may be a single pole, usually one or two different sizes of pipe telescoped together to be moved or extended and locked to obtain maximum height above a well. Double-pole masts give added strength and stability. See mast.
yield value
The yield value (commonly called "yield point") is the resistance to initial flow, or represents the stress required to start fluid movement. This resistance is due to electrical charges located on or near the surfaces of the particles. The values of the yield point and thixotropy, respectively, are measurements of the same fluid properties under dynamic and static states. The Bingham yield value, reported in lb/100 square feet, is determined by the direct-indicating viscometer by subtracting the plastic viscosity from the 300-rpm reading.
cementing materials
A slurry of portland cement and water and sometimes one or more additives that affect either the density of the mixture or its setting time. The portland cement used may be high early strength common (standard), or slow setting. Additives include accelerators (such as calcium chloride), retarders (such as gypsum), weighting materials (such as barium sulfate), lightweight additives (such as bentonite), or a variety of lost circulation materials (such as mica flakes).
wire rope
A cable composed of steel wires twisted around a central core of fiber or steel wire to create a rope of great strength and considerable flexibility. Wire rope is used as drilling line (in rotary and cable-tool rigs), coring line, servicing line, winch line, and so on. It is often called cable or wireline; however, wireline is a single, slender metal rod, usually very flexible. Compare wireline.