厚壁套管与植物胶用于深厚砂卵砾石层钻进的应用研究

Application Research on Thick-walled Casing and Vegetable Gum for Drilling in Deep Gravel and Pebble Stratums

摘要:

针对大渡河巴底水电站深厚覆盖层钻进过程中遇到的护壁、取心、孔内事故等主要技术问题，采用φ139 mm厚壁套管护壁和SH植物胶取心钻进工艺，有效地提高了取心质量和钻进效率。φ139 mm厚壁套管可以有效克服深厚覆盖层钻进过程中薄壁套管护壁导致孔内事故频发以及跟进深度较浅等致命缺点，也克服了φ127 mm常规厚壁地质管材不能下如薄壁φ108 mm套管的缺点。该工艺不仅提高了取心质量，也极大地提高了钻进效率和保证了成孔概率，节约钻进成本，提高了经济效益。

关键词:植物胶;深厚砂卵砾石层;钻进;φ139 mm厚壁套管;孔内事故

Abstract:

To make the drilling process more efficient and successful against drilling complex formations while penetrating through deep thick overburden layer at Badi hydropower station over the Dadu river, 139 thick-walled casing and vegetable gum were used to improve coring quality and drilling efficiency respectively. 139 thick-walled casing can avoid frequent drilling accidents and shallow depth in casing process and is compatible with 108 casing much better than 127. It is proved that this technology can give good coring qualityand satisfy drilling efficiency with lower drilling cost and higher economic benefits.

Key words:vegetable gum; thick deep gravel and pebble stratums; drilling; φ139 thick-walled casing; downhole accident