| 摘要 |
The present invention relates to a drilling fluid additive for improving lubricity or rate of penetration (ROP) in a drilling operation, such as an o il and gas drilling operation. The additive comprises particles of wax or wa xy substance, or a mixture of two or more types of said particles having dis tinct properties, such as particle size, type of wax or waxy substance, melt point, solubility, dissolution rate, hardness, shape, blocking ability, or a combination thereof. In certain embodiments, the additive is environmental ly friendly and biodegradable. The invention also relates to a drilling flui d comprising the drilling fluid additive of the invention. A method of impro ving lubricity or increasing ROP in a drilling operation is also provided, a s well as a use of particles of wax or waxy substance or mixture thereof as a drilling fluid additive for improving lubricity or increasing ROP in a dri lling operation.
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