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Completion, Workover, and Intervention Fluids 215

(Kazakhstan), the produced gas has over 13% H 2 S. A loss of containment
is potentially fatal. The wells have barefoot lower completions in a thick,
naturally fractured formation. The upper completion is run with mud still
in the well. Post-completion the formation is acid washed using coil tub-
ing. Well kill and workovers are similarly carried out with mud in the
well. Mud is the correct fluid, given the circumstances, the hazardous
nature of the produced gas, and the ability to easily remove mud damage
with acid.

REFERENCES
1. Table 1 and 2 values from SPE paper 12490. G W Krook and T D Boyce. 1984.
2. API RP 13J/ISO 1353-3. Testing of heavy brines. 4th ed. American Petroleum
Institute; 2006.
3. TETRA Technologies, Inc. The engineered solutions guide for clear brine fluids and
filtration. 2nd ed. Chapter 2; 2007.
4. Bridges KL. Completion and workover fluids. SPE monograph series. Richardson, TX:
SPE; 2000.
5. Bellarby J. Well completion design. New York: Elsevier; 2008.
6. API RP 13J/ISO 1353-3. Testing of heavy brines. 4th ed. American Petroleum
Institute; 2006.
7. Murphey JR, Swartwout R, Caraway G, Weirich J. The effect of pressure and tem-
perature on high density brines. IDAC/SPE paper 39318.
8. Buc Slay J, Ray, T.W. Halliburton energy services. Fluid compatibility of elastomers
in oildfield completion brine. Corrosion 2003. Paper 03140.
9. Vaidya RN, Fogler HS. Formation damage due to colloidally induced fines migration.
Department of Chemical Engineering. The University of Michigan, Ann Arbour, MI
48109-2136; March 1990.
10. Crowe CW, Cryar HB. Development of oil soluble resin mixture for control of fluid
loss in water base workover and completion fluids. SPE paper 5662-MS.