Hydraulic parameter design chart of aerated nitrogen underbalanced drilling and application in fractured reservoirs

doi:10.3969/j.issn.1672-7703.2017.06.014

Abstract

Abstract: Aerated nitrogen drilling is an important technical method for discovering and protecting oil and gas reservoirs, controlling mud loss in fractured reservoirs, and improving ROP. Using experimental data and calculation demonstration, the fluid patterns of gas-liquid two-phase flow in wellbore annulus and drill string while drilling were analyzed, the wellbore fluid flowing model and numerical solution during aerated drilling were established, and the gas-liquid flowing parameter design chart for conventional wellbore structures was developed and used the aerated nitrogen drilling test in Well Baiquan 1 in the Junggar Basin. In the field test, the safe density window of the drilling fluid was selected, and nitrogen injection parameters and underbalanced drilling equipment were designed according to the leakage and collapse pressures of the Permian fractured reservoirs. The successful application of this method in Well Baiquan-1 has fully proved that the aerated nitrogen drilling technology has wide formation adaptability, larger pressure control range, and effective reduction of lost circulation in fractured reservoirs, thus it is beneficial to reservoir exploration and discovery. Moreover, the new design chart can completely satisfy the requirements for engineering design and field operation in aerated nitrogen drilling in conventional wellbores.

Key words: fractured reservoir, aerated drilling fluid, flow parameter, design chart, application case

CLC Number:

TE22

Yang Hu. Hydraulic parameter design chart of aerated nitrogen underbalanced drilling and application in fractured reservoirs[J]. China Petroleum Exploration, 2017, 22(6): 118-124.

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