Research And Application On Key Technology Of Drilling Assembly Intelligent Design

Drilling assembly design is one of the most difficult and very important steps in drilling engineering design,especially the development of directional and horizontal wells.It also makes drilling assembly design one of the key issues in drilling engineering.Faced with the current trend of intelligent manufacturing,in order to improve the efficiency and quality of the design of the drilling assembly,an intelligent design method is needed to inherit,share and reuse the knowledge of the design of the drilling assembly.At present,due to the heterogeneity and distribution of drilling engineering design information,it is difficult to share and reuse knowledge,and knowledge management is difficult.The traditional knowledge modeling method is lack of expression ability,reasoning ability and flexibility in complex drilling assembly design concept and its relationship,and it is difficult to solve the problem of sharing and reuse of heterogeneous knowledge.Ontology is a new method to apply philosophical concepts to semantic technology.It has good conceptual hierarchy,logical reasoning ability and strong knowledge expression ability.It has obvious advantages in solving knowledge representation,reasoning,integration and sharing.Therefore,in this paper,using the advantages of information technology and ontology in the field of knowledge,it is of great significance to study the intelligent assistant design of the drill assembly.In this paper,aiming at the large amount of fuzziness,randomness and uncertainty in the design of the drilling assembly,a knowledge-based model of the design of the drilling assembly based on ontology is proposed.Firstly,based on the analysis of the relationship between drilling tool design knowledge and design knowledge,the concept and terminology of drilling design are standardized,the relations between concepts are defined,and the semantics of drilling assembly design knowledge is described.Based on the CommonKADS knowledge ontology model,a knowledge ontology library is constructed.This model describes the ontology mapping of the drilling assembly design ontology base by using ontology reasoning while using the ontology to describe the assembly design knowledge.By using the ontology mapping rules and the self-defined rules,the model completes the ontology-based knowledge and reasoning process.Secondly,by combining the method of ontology and case-based reasoning,this paper achieves the design of drilling tool assembly by combining the combination of ontology knowledge base and tooling design case knowledge base,using semantic matching similarity and attribute similarity.Finally,the combination of ontology knowledge base and drill bit design stratigraphic comprehensive coefficient method is used to realize the intelligent selection of drill bits,and the prototype of drill bit assembly intelligent design is realized.The experiment and operation show that the ontology-based drilling assembly intelligent auxiliary solution is feasible and can greatly improve the actual work efficiency.