fann 21150, Инструкция по эксплуатации, Страница: 5 / 31

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SECTION 1
GENERAL INFORMATION
The Differential Sticking Tester Apparatus was designed to determine how likely a given
drilling fluid will be to produce a "stuck pipe" situation and how effective a given drilling
fluid treatment or application of spotting fluid in any given drilling fluid would be in reducing
this tendency. This measurement is called the "Stuck Tendency Coefficient". It takes into
account both the stickiness and the cake building capability of the drilling fluid. The "Stuck
Tendency Coefficient" is determined by the Timed Filtrate Test.
The unit can be pressurized by the CO
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regulator assembly or from any nitrogen source.
If Nitrogen is to be used, the Differential Sticking Tester must be fitted with a suitable
Nitrogen regulator, gauges, relief valve, hose and fittings. The tests use 477.5 psi (3292
kph) differential pressure applied to a stainless steel vessel of approximately 200 ml
capacity. The measurement can be made using either the flat-faced torque plate or the
12-1/2" (31.75 cm) spherical radius
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plate which approximates pipe in casing or collars in
borehole contact geometry. (Both are provided.) In the event of a "sticky" sample that
tends to adhere more to the torque plate than to the filter paper, stainless steel micro-
corrugation disks are provided, along with extra-strength paper (within 2% of standard
paper filtration speed) to ensure success of the test.