Im

Mud circulated through a 2 in (5 08 cm) diameter hole in consolidated sand. Turbulent flow. Filtration pressure 350 psi (24-6 kg/cm-) *From Prokop.21 Copyright 1952 by SPE-AIME.

(Text continued on page 307.)

Mud circulated through a 2 in (5 08 cm) diameter hole in consolidated sand. Turbulent flow. Filtration pressure 350 psi (24-6 kg/cm-) *From Prokop.21 Copyright 1952 by SPE-AIME.

(Text continued on page 307.)

API 30 min. filter loss Marsh viscosity Stormer viscosity Density

Filtration pressure, runs 33-37 Filtration pressure, run 39 Drill string rotation

Mud velocity between 41/4 OD drill collar and 5s'e hole:

Mud velocity between 41/4 OD drill collar and 5s'e hole:

IS 20

Time, Hours

IS 20

Time, Hours

Figure 6-13. Dynamic filtration from oil base mud. {From Ferguson and K/ofz.24 Copyright 1954 by SPE-AIME.)

Figure 6-13. Dynamic filtration from oil base mud. {From Ferguson and K/ofz.24 Copyright 1954 by SPE-AIME.)

Time, Hours

Average properties: Filtration pressure 400 psi; drill string rotation 90 rpm; Mud velocity between 41 4 OD drill collar and 51s hole:

Average properties: Filtration pressure 400 psi; drill string rotation 90 rpm; Mud velocity between 41 4 OD drill collar and 51s hole:

API 30 min. water loss

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