Workover well control. Part 8 (Conclusion). How to use fluids to best advantage
Fluids used during workover and completion range from low-density gases to high-density muds and packer fluids. Typically, workover fluids (those used during reworking a well after its initial completion) are gases (N/sub 2/ or natural gas), brines, and muds; their functions include (1) well killing, (2) well cleaning by removing sand, rock, metal cuttings, and foreign objects, (3) drilling into a new productive interval, and (4) plugging back to complete a shallower interval. The primary requirement for completion fluids, which are used while establishing final communications between the formation and the wellbore, is that the fluid does not damage or block the producing formation. Such fluids include commercial workover fluids, N/sub 2/, and clean, low-solids brines. Completion fluids can be used for short periods (such as during perforation) or for extended periods (such as in gravel packing). Packer fluids, which are placed in the annulus between the production tubing and the casing, must maintain pressure control, be nontoxic and noncorrosive, remain pumpable, and minimize formation damage.
- OSTI ID:
- 5511425
- Journal Information:
- Oil Gas J.; (United States), Vol. 79
- Country of Publication:
- United States
- Language:
- English
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