Gas flow control method of recycling gas drilling technology
by Jun Li; Shunji Yang; Gonghui Liu
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 6, No. 6, 2013

Abstract: Recycling gas drilling is a new drilling technology. The paper based on the theory of gas transient flow, a set of theoretic models of gas flow control at the export of annulus are set up in combinations of the principles of the seepage flow mechanics and the characteristics of recycling gas drilling technique. According to the basic laws which the flowing gas should comply with, the properties of various gas flows and the dynamic pressure are portrayed when the gas zone is penetrated. Two control schemes are proposed, namely constant pressure method and constant flow rate method. The MacCormack method and the characteristic line method are used to solve the theoretic models. The process of drilling gas zone was analysed using numerical simulation. The results of study can play a positive role in guiding the field operation. [Received: January 13, 2012; Accepted: March 17, 2013]

Online publication date: Wed, 29-Jan-2014

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