PCT No. PCT/NO94/00163 Sec. 371 Date Apr. 10, 1996 Sec. 102(e) Date Apr. 10, 1996 PCT Filed Oct. 11, 1994 PCT Pub. No. WO95/10764 PCT Pub. Date Apr. 20, 1995An apparatus for testing a shear thickening plugging fluid that is an emulsion of two components which react with each other to provide a thickening of the fluid when subjected to high stress, such apparatus comprising a cylinder (1) having an inlet (2) with an inlet valve (3) for the plugging fluid and an outlet (4) with an outlet valve (5) for the plugging fluid, a moveable piston (6) sealing against the chamber walls, so that the piston by being moved rearward in the cylinder can suck plugging fluid into the cylinder through the inlet (2), and in a retrograde movement can press the plugging fluid out through the outlet (4), a shear valve (7) connected with the outlet (4), which shear valve (7) is adjustable for adjusting a desired shear stress to be subjected upon the plugging fluid, a means (8, 9) for measuring the pressure drop over the shear valve (7), a receiver means (10) for collecting plugging fluid that has been pressed through the shear valve, and one or more means for measuring properties of the shear thickening plugging fluid.
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