Beijing Huayou Lianheng Petroleum Technology Co. , Ltd. was established in May 2009, is engaged in oil and Gas Field Downhole tools R & D, design, production, sales and service integration of professional technology companies. Established its Huanghua branch in August 2018. Based on the guidance of the domestic expert group and drawing on the advanced technology from abroad, mainly committed to: downhole new bridge plugs,  completion tools, wireline tools and other downhole  tools with special feature for oil production.  One patent retrievable bridge plug has successfully completed many times of plugging and retrieval in horizontal wells in the Daqing Oil Field. Hundreds of high pressure and high temperature oil wells has been applied to this type of bridge plug for oil testing or fracturing operations in Dagang Oil Field and Jidong Oil Field. 

          北京华油联恒石油技术有限公司成立于2009年，是从事油气田井下工具研发、设计、生产，销售与服务一体化的专业技术公司。2018年设立黄骅分公司，公司在国内专家组的指导并借鉴国外先进技术的基础上，主要致力于：井下封堵新产品、井下完井工具及钢丝操作工具、井下开采工具的开发与生产，其中研制与生产的可取桥塞在大庆油田和大港油田实现了水平井多层段大跨度的分层压裂，在冀东油田和大港油田进行了数百次的试油封堵或压裂施工。