| 摘要 |
A sulfonated gilsonite used in a drilling mud for drilling a well wherein the sulfonated gilsonite is prepared by reacting at a temperature between 210 DEG -280 DEG F. with a mixture of water, gilsonite having a softening point of at least 300 DEG F., lignite, sulfonating compound and water soluble based compound for a period of time to sulfonate the gilsonite.
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