Method for drying pipelines
Patent
·
OSTI ID:7060931
The interior surface of a pipeline is dried by sequentially passing through the pipeline 1) an aqueous cross-linked gelled pig, 2) a fluid mobility buffer comprising a noncross-linked gelled alkanol from one to 3 carbon atoms, and 3) a dessicating amount of a liquid alkanol from one to 3 carbon atoms. For example, a pipeline was dried by sequentially passing through it a borate cross-linked hydroxypropyl guar gum pig, a fluid mobility buffer comprising methanol thickened with hydroxypropyl cellulose, and methanol. The cross-linked pig also may comprise a guar gum or hydroxypropyl guar gum cross linked with borate, titanate, or zirconium ions. 10 claims.
- Assignee:
- Dow Chemical Co.
- Patent Number(s):
- US 4254559
- OSTI ID:
- 7060931
- Country of Publication:
- United States
- Language:
- English
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