裂缝性储层充氮气欠平衡钻井流体参数设计图版与实例

doi:10.3969/j.issn.1672-7703.2017.06.014

摘要/Abstract

摘要： 充气钻井是发现和保护油气藏、防止裂缝性储层井漏、提高机械钻速的重要技术手段。通过实验资料和计算论证，阐述了井筒环空与钻柱内两相流体呈现出的流型特征。同时，建立了充气钻井井筒流动模型和数值解法，计算并绘制出常用井身结构的气液流体参数设计图版。准噶尔盆地百泉1井充氮气钻井试验采用了新建的井筒气液两相流体注入参数设计图版。根据二叠系裂缝性储层漏失压力和坍塌压力，确定钻井流体安全密度窗口，设计该井氮气注入参数和欠平衡专用设备需求量。该井的成功实践充分证实充氮气钻井具有地层适应性强、压力控制范围大、可有效避免裂缝性储层井漏，利于勘探发现。同时，新建的设计图版完全满足常规井眼条件下充氮气钻井的工程设计和现场作业。

关键词: 裂缝性储层, 充气液, 流体参数, 设计图版, 应用实例

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

中图分类号:

TE22

杨虎. 裂缝性储层充氮气欠平衡钻井流体参数设计图版与实例[J]. 中国石油勘探, 2017, 22(6): 118-124.

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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