II The construction method research of search engine base on Federal model in oil-field information ABSTRACT In the period of the construction of the digital oilfield, there is many forms about the data of exploration and development of oil and gas fields storage media, including web pages, documents, database, etc., it is difficult to let user access to data and operate data. According to this situation, some professional branch has established a variety of search engines in the oil field, which were used to search information in the branch. Because there are differences in the search engine which used by all the branch, including time and space, so the unified system in oilfield internal was not formed, when people want to find information, they often do not know which search engine system can be used to access, as the result, the problem is appeared about search engine integration. The face of the ch