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Underbalanced drilling technology has been extended deeply into every corner of the industrial productions and processes. In particular, the technology has a wide range of applications in oil and gas industries for the product design, manufacturing and construction process. In this work, a new air injection connector system has been developed for underbalanced drilling. The system development includes five key issues: original design, manufacturing control, experimental method, on-spot drilling design, and field work point control. The air injection connector system plays an important role and can significantly reduce potential losses during the drilling process.

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Currently, the maturity technical of rotary steerable drilling is monopolized by some foreign companies, including Schlumberger, Baker-Hughes, Halliburton and so on. They still blocked the domestic implementation of technology, and provided exclusively costly services, so that the corresponding drilling costs increase greatly. Domestic rotary steerable drilling technology research started late, and in the development stage, therefore, to break the foreign monopoly, developed with our own intellectual property rotary steerable drilling technology can significantly improve our oilfield services company's market competitiveness, and generate enormous economic benefits.When using the rotary steerable drilling technology for drilling operation, it does not require frequent tripping you can achieve a tree-dimensional trajectory control, and this technology not only has greater advantage of smoother wellbore trajectory and extending a distance, but also has important significance for ensuring the well trajectory quality, increase drilling speed and efficiency, demand to meet the complex structure of wells drilled [1][2][3][4][5].Therefore, this article focuses on the static thrust against rotary steerable; the tool can achieve three-dimensional trajectory control, and has greater advantage of smoother wellbore trajectory and extending a distance. It also has the important significance for ensuring the well trajectory qualities, increasing drilling speed and efficiency and demanding to meet the complex structure of wells drilled. II. PUSHES AGAINST THE STATIONARY ROTARY STEERABLE SYSTEMS COMPONENTSRotary steerable drilling systems is composed by the ground control system, ground-underground two-way communication systems, LWD systems, MWD systems power supply systems inclination measurement and control systems-oriented guide the implementing agencies and so on (Fig .1). Depending on the different of system structure, the system is divided into geometric rotary steerable drilling system and geo-steering rotary drilling system, in which geometric steerable drilling system does not contain LWD systems. Rotary steerable drilling tool includes the underground part of ground -underground two-way communication system, power supply system, attitude measurement and orientation control system, guide actuating mechanism.The monitoring system of ground is an indispensable part in rotary steerable drilling system, and it is the command center of the entire system.