The PPT apparatus may be used in the lab to evaluate lab formulated muds or mud systems submitted by the field. The apparatus is also portable and can be used at the rig to evaluate the mud system and to test the bridging effectiveness at downhole temperature and pressure of various additives. Information from the PPT is especially useful on critical wells - drilling depleted sands or high angle holes. (A diagram of the PPT apparatus is shown in Figure 37.) The test procedure is as follows:
[Note: Several manufacturers supply the hardware for the device. These steps are not meant to be specific but rather apply to all cells. Manufacturer instructions should be consulted before any tests are performed.]
Figure 37 Permeability Plugging Test Apparatus
High Pressure Ualue
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