Structure Design And Optimization Of Circuit Warehouse Of Rotary Steering Drilling Tool

Rotary steerable drilling technology which has realized the path directional control in the drilling process, has become the key and advanced technology of directional drilling in the oil and gas drilling activities, and will be the mainstream of directional drilling technology in the future. Due to the limited under-well space which is full of high-temperature and pressure mud, the circuit silo of under-well offset mechanism in current rotary steerable drilling systems mainly adopts separable structures in order to optimize the space. With elaborate processing and assembling workmanship, this structure is in cable layout and complex connection, and lowers the reliability of system sealing.This paper presents an integral type of circuit silo structure which is used in Down-hole Bias Tee. Firstly, this structure adopts the traditional design, and transitions to the integral circuit silo structure design based on the design input and the design of rotating spindle of the circuit silo related components. Secondly, an optimization design is carried out on this structure with the method of Computer Aided Engineering. At the concept phase, this paper calculates the initial models of the integral circuit silo with the topological optimization method and on this basis, a detailed design is carried out. To approach the single installment cavity of the integral circuit silo to its local centers by means of shape optimization, a maximum installment cavity is obtained which can work under the stress conditions within the design space. Thirdly, an optimization is given after the careful comparison about sizes of the integral circuit silo. Meanwhile, the main structure of the integral circuit silo with an optimal structural strength, which also meets the requirements of this installment, has been designed on the actual contact model. Finally, this paper makes a contrast test on the optimized main structure of the integral circuit silo with that of the original design, analyzes the contact strength between compressive cylinders and bases from the real work circumstance, and verifies the structural strength of the integral circuit silo.This paper designs the integral circuit silo with a reliable strength by using modern design methods, and solves the key problems occurred in the development of rotary steerable drilling systems, which also provides a reference for the design optimization of similar oil drilling equipment structures.