Plugging agent for petroleum drilling and preparation method thereof

The invention relates to a plugging agent for petroleum drilling and a preparation method thereof. The plugging agent for petroleum drilling disclosed by the invention comprises a blended sinter containing polytetrafluoroethylene and a metal screen. The method for preparing the plugging agent for petroleum drilling comprises the following steps: S1, preparing a polytetrafluoroethylene emulsion; and S2, forming a blend from the polytetrafluoroethylene emulsion and the metal screen, and sintering and crushing the blend to obtain the plugging agent. Through cooperative use of polytetrafluoroethylene and the metal screen, the plugging agent for petroleum drilling, which has enhanced high-temperature and high-pressure resistance and retains relatively strong anti-slip performance, is obtained. 本发明涉及石油钻井用堵漏剂及其制备方法。本发明的石油钻井用堵漏剂包括含有聚四氟乙烯和金属筛网的共混烧结物。本发明的制备石油钻井用堵漏剂的方法包括以下步骤：步骤S1：制备聚四氟乙烯乳液；步骤S2：将聚四氟乙烯乳液与金属筛网形成共混物，将共混物烧结、破碎，得到堵漏剂。本发明通过聚四氟乙烯和金属筛网的配合使用，获得了具有增强的抗高温高压性能同时保留了较强抗滑脱性能的石油钻井用堵漏剂。