Annular Aerated Gas-lift Reverse Circulation Drilling Technology and Key Parameters Design

doi:10.11885/j.issn.16745086.2021.04.29.01

Abstract

Abstract: Using gas lift reverse circulation drilling technology to solve the leakage problem of Changning shale gas surface drilling, it is necessary to solve the problems of conventional gas lift reverse circulation drilling technology, such as open wellhead and inaccurate bottom hole pressure control. Therefore, on the basis of conventional gas-lift reverse circulation drilling technology, a new annular aerated gas-lift reverse circulation drilling technology is designed. The new technology is equipped with rotary blowout preventer, drill pipe cock and other tools, which has well control ability. By adjusting key construction parameters such as gas injection rate and drilling fluid displacement, bottom hole pressure is controlled to reduce drilling leakage. Based on the multiphase flow theory, the calculation model of bottom hole pressure for annular aerated gas-lift reverse circulation drilling technology is established. The influence of key construction parameters on bottom hole pressure is analyzed, and the design method of key parameters is established. The key construction parameters are optimized within the scope of safety window to ensure safe drilling. The results show that the bottom hole pressure first decreases and then rises with the increase of gas injection rate, and there is a critical gas injection rate; the bottom hole pressure rises with the increase of well depth; the bottom hole pressure rises with the increase of drilling fluid displacement. The field test was carried out in the surface drilling of a well in Changning. Compared with the lost circulation formation in the same section, the lost circulation was reduced by 83.6% using the conventional drilling technology. The research results provide a new technical measure to solve the problem of lost circulation in the surface drilling of Changning shale gas in Sichuan.

Key words: gas-lift, reverse circulation, lost circulation, multiphase flow, well control

CLC Number:

TE242

LI Qian, ZHANG Xiaolin, LI Zhengtao, LI Juan, DAI Feng. Annular Aerated Gas-lift Reverse Circulation Drilling Technology and Key Parameters Design[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 35-43.

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