Study On The Formation Technology Of The Window Window In The Deep Well

Deep oil and gas resources exploration and development in China in recent20years obtained the breakthrough, Mainly distributed in4000-8000meters deep well, the drilling and completion technology is also from shallow to deep and ultra-deep horizontal well development. Therefore, the deep well of super deep well casing section milling window sidetrack drilling will be one of the select measures of middle and later periods of the oil field exploration deep residual hydrocarbon reservoirs. According to the literature, deeper than5000meters deep side of casing drilling Numbers are increasing inland, but for section milling window sidetrack One-time success rate is lower than fifty, The main reason is that open a window for deep well casing section milling sidetracking particularity caused by inadequacy understanding. This particularity is mainly the wall thickness of steel is a high strength, lack of deep well pump pressure distribution in section milling window, Blade severely damaged and Iron filings return difficult. Existing section milling machine can’t meet the needs of actual working condition, lead to section milling window low efficiency, poor reliability. Therefore, carries on the deep well of super deep well casing window section milling technology research has important practical significance and development prospect.In this paper, considering the particularity of deep and ultra deep well casing milling sidetracking, the innovative design of the deep and ultra deep well casing section milling sidetracking efficient tool and improve the supporting technology.In deep and ultra deep well casing section milling sidetracking tool design is:first of all, reading a lot of literatures and field investigation, established the design scheme, Through the study of cutting section milling condition of wear mechanism, Innovative design of full hydraulic pressure drive duplex linkage pressure forced telescoping rigid support section milling machine, It has high strength Reliability, stability good characteristics and will effectively improve the deep well of super deep well casing section milling efficiency of window operations, Based on the finite element analysis shows that:the intensity of blade under the working conditions meet the stiffness requirement, no phenomenon of blade fracture. Based on the dynamic theory, a mechanical model is established and the vibration rotation bending vibration, Used for exploratory analysis section milling conditions section bending vibration characteristics of the milling machine and under certain conditions section milling the shape of the heart around the rotation of the limit cycle characteristics.