Expandable graphite material as well as preparation method and application thereof

The invention provides an expandable graphite material as well as a preparation method and application thereof. The expandable graphite material provided by the invention comprises expanded graphite treated by an alkaline buffer solution or an acidic buffer solution. The expandable graphite material provided by the invention can control the expansion temperature at 130-200 DEG C, is controllable and convenient, and can generate an expansion effect in a high-temperature aging process after being added into the drilling fluid, so that the filtration loss and the plugging property of the drilling fluid are better reduced. 本发明提供了一种可膨胀石墨材料及其制备方法和应用。本发明提供的一种可膨胀石墨材料，其包括经碱性缓冲液或酸性缓冲液处理的膨胀石墨。将本发明提供的可膨胀石墨材料可以将膨胀温度控制在130℃-200℃，可控，方便，将其加入钻井液中，在高温老化过程中可以发生膨胀效果，从而更好降低钻井液的滤失性、封堵性。