滨浅海砂层钻探施工工艺实践与应用

Practice and application of drilling construction technology for littoral-shallow-sea sand layers

摘要:

滨浅海砂层钻探面临复杂的施工环境和特殊的地层条件，施工难度显著提高。为应对滨浅海砂层钻探的施工难点，本文分析了砂层钻探的施工特点及环境因素，选择使用转盘工程钻机，并采用孔底冲击钻具，创新性地提出了“转盘驱动套管+孔内绳索冲击+花瓣式取心机构”的跟管取心工艺。同时，结合高频振动锤，成功解决了砂层成孔困难和取心率低等问题。在滨浅海海域砂矿的实际应用中，该施工工艺表现出良好的效果，为今后滨浅海砂层钻探取心的研究与应用提供了参考与借鉴。

Abstract:

Drilling in littoral-shallow-sea sand layers faces complex construction environments and special stratigraphic conditions， significantly increasing construction difficulty. To address the construction challenges of drilling in littoral-shallow-sea sand layers， this paper analyzes the construction characteristics and environmental factors of drilling in sand layers， selects a rotary-table engineering drilling rig， and adopts bottom-hole impact drilling tools. It innovatively proposes a casing-while-coring technique featuring a "rotary-table-driven casing+in-hole wireline percussion+petal-type coring mechanism". At the same time， combined with a high-frequency vibrating hammer， the technique successfully solves problems such as difficulty in borehole formation and low core recovery rate in sand layers. Satisfactory application performance has been achieved in the sand-ore of littoral-shallow-sea areas，which provides a reference and guiding significance for future research and application of drilling and coring in littoral-shallow-sea sand layers.