The viscosity of drilling fluid is determined using the Marsh funnel. The Marsh funnel is made of impact-resistant plastic and has an orifice with a length of 50.8 mm (2.0 in) and an inside diameter of 4.7 mm (3/16 in). A screen attached to the Marsh funnel prevents the orifice from becoming clogged with larger particles.
A graduated cup with a capacity of over 946 ml (1 quart) was specially designed to match the Marsh funnel viscometer. The Marsh funnel cup has a double spout for ease of use. The scale in milliliters is firmly cast into the cup. There is also a scale in ounces based on the US system of measurement.
During operation the funnel orifice is covered with a finger and freshly sampled drilling fluid is poured through the screen into the upright funnel. The finger is removed and the stopwatch started. The time for the drilling fluid to fill to 946 ml (1 quart) mark of the cup is measured.
To perform the Marsh funnel test, the Marsh funnel, a support, the Marsh funnel cup, a stopwatch and a thermometer are required.
The MUDTES Marsh funnel is conform to API 13B-1, the corresponding ISO 10414-1: Oil and gas industry - Field testing of drilling fluids" and EN 14117: Products and systems for the protection and repair of concrete structures. A link to these standards can be found at Download area. While the API standard describes test methods for drilling fluids, EN 14117 only contains a dimensional sketch of the funnel described here.
The cone for fluidity test according to EN 445: Grout for prestressing tendons — Test methods, can be found here.
|Marsh funnel (4,76 mm)||8020.00.20000|
|Graduated cup with double spout||8020.00.50000|
|Support for Marsh funnel||8020.00.70000|