| 摘要 |
An aqueous wellbore service fluid comprises a crystalline, particulate additive which is soluble in hydrocarbons and insoluble in an aqueous solution. The additive prevents fluid loss from a wellbore by accumulating at the face of a permeable formation after which it can be removed by letting hydrocarbons enter the wellbore from the formation thereby dissolving at least a part of the accumulated additive. Preferably the additive has a molecular weight of less than 1000 and a melting point over 80{C. Examples of the additive are 1S-endo-Borneol, camphor, iodine, beta carotene, lycopene, cholesterol, lanosterol and agnosterol.
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