Development of a Dual-Measured-Points Early Gas Kick Detection Method based on the pressure responses of two PWD tools
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ICCESEN 2017
Development of a Dual-Measured-Points Early Gas Kick Detection Method based on the pressure responses of two PWD tools Hongwei Yang 1 & Jun Li 1 & Gonghui Liu 1,2 Received: 14 September 2018 / Accepted: 30 July 2020 / Published online: 8 August 2020 # Saudi Society for Geosciences 2020
Abstract Early gas kick detection is an important measure to ensure well control safety. In this paper, firstly, a new two-phase flow model was developed to accurately describe the transient annular pressure responses at the PWD tool during the gas influx. Secondly, a Dual-Measured-Points Early Gas Kick Detection Method was proposed based on the consistency and discrepancy between the pressure responses of two PWD tools. The results of case research indicated that the annular pressure increased and changed periodically with time in the initial stage of gas kick and then declined approximately linearly after the gas-liquid interface reached the PWD tool. Additionally, the proposed gas kick detection method could significantly reduce the chances of the gas kick misdiagnosis and improve the reliability of the gas kick detection. Moreover, the gas kick confirmation time (GKCT) obtained by the proposed method was 2–7 min, and the corresponding gas kick confirmation volume (GKCV) was 0.3–0.5 m3. The GKCT diminished with the increase in the formation permeability and the bottomhole pressure difference and with the decrease in the borehole size and the well depth. Keywords Gas kick detection . Transient pressure model . Pressure response . Dual-Measured-Points . PWD tool
Introduction Early gas kick detection is a significant measure to guarantee well control safety (Alhuthali et al. 2010; Cornish 1976; Jardine et al. 1991; Kinik et al. 2015). Gas kick is defined as the unscheduled entry of formation gas to the wellbore because the mud barrier fails to resist the high pore pressure. It poses a significant threat to wellbore safety (Hu et al. 2018). The delay in its detection adds the difficulty of well control treatment and may even allow formation gas to flow out of the wellhead, causing a blowout accident (Carlsen et al. 2013). Therefore, early gas kick detection is extremely crucial for well control safety.
This article is part of the Topical Collection on Geo-Resources-EarthEnvironmental Sciences * Hongwei Yang [email protected] 1
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, China
2
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China
At present, gas kick detection was mainly conducted through measuring the pit gain or the flow difference between the inlet and the outlet at the surface (Helio et al. 2003; Henry et al. 2006; Brakel et al. 2015; Cayeux and Daireaux 2016; Su et al. 2018). In offshore and deepwater drilling, gas kick could also be detected by monitoring the acoustic wave velocity which was significantly influenced by the free gas (Bang et al. 1994; Dashti and Riazi 2014; Huang et al. 2018; Stokka et
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