油基钻井液体系因其良好的稳定性和抑制性多应用于深层油气复杂的地层，但是高效防漏堵漏材料的匮乏限制了油基钻井液的使用。针对上述问题，首次提出以丙烯酸酯单体为主链，引入抗高温、增强与地层黏结性的功能单体，采用溶液聚合方法合成了均一稳定的聚合物防漏剂，同时引入不同浓度的交联剂乙二烯基苯，并研究其浓度对于聚合物防漏剂的影响。室内防漏实验结果评价表明，聚合物防漏剂对油基钻井液体系具有良好的防漏作用，钻井液累计漏失量降低率最高可达68.7%，明显优于常规防漏材料。通过对比实验，发现交联剂的引入会降低防漏剂的封堵能力，且随着交联剂浓度的增大，聚合物防漏效果呈变差趋势。所制备的聚合物防漏剂为预防油基钻井液漏失问题提供了新的思路，具有较高的现场应用潜力。

Oil-based drilling fluids, favored for their superior stability and inhibitive properties in complex deep oil and gas strata, is constrained by a scarcity of efficient materials for leak prevention and plugging, thereby limiting their utilization. In response to this challenge, a homogenous and stable polymer, SMHDVD, was synthesized via solution polymerization, using acrylate monomers as the primary chain and incorporating functional monomers that offer resistance to high temperatures and enhanced bonding with the formation. The impact of different concentrations (0.1%, 0.3%, and 0.5%) of the crosslinking agent divinylbenzene on the polymer SMHDVD was also investigated. In-house plugging experiments have shown that SMHDVD significantly contributes to the plugging efficacy of oil-based drilling fluid systems, with a maximum reduction in cumulative drilling fluid loss of up to 68.7%, surpassing the performance of conventional plugging materials. It was observed through comparative studies that the incorporation of a crosslinking agent diminishes the sealing capacity of SMHDVD, and an increase in the crosslinking agent's concentration leads to a decline in the polymer's plugging performance. The polymeric plugging agent developed in this research offers a novel perspective for the prevention of oil-based drilling fluid leakage, with promising prospects for practical field application.