细颗粒沉积物分布区地下水源热泵抽灌井施工工艺探讨

A discussion of the construction technology of pumping and injection wells in the fine particle sediment distribution area

郑州市广泛分布着第四系松散堆积物,其特点是颗粒细,厚度大,含水介质主要为细颗粒的砂层。由于地下水富水性好,目前郑州市浅层地温能开发利用主要以地下水地源热泵工程为主。传统正循环泥浆钻探工艺施工的地温空调井,普遍存在洗井困难、涌水量和回灌量偏小的问题,在很大程度上限制了地下水地源热泵工程的推广使用。针对这一问题,本次采用泵吸反循环工艺施工地温空调井。施工过程及试验数据对比分析表明,在细颗粒松散沉积物分布区,采用泵吸反循环钻探工艺施工地温空调井,对提高施工进度、增大出水量和回灌量等方面具有显著优势,可以为类似地区地温空调井的施工提供借鉴。

Quaternary unconsolidated sediments occur widely in Zhengzhou, which are characterized by fine particles, large thickness, aqueous medium sand layer of fine particles. Duo to rich groundwater, development and utilization of shallow geothermal energy is mainly in the form of groundwater source heat pump in the city of Zhengzhou. Traditional positively circulating mud drilling technique of construction of the ground temperature air-conditioning well is difficult to wash the well and is small in inflow and recharge, and has the limitation to promote the use of groundwater source heat pump. To solve these problems, the pumping suction reverse circulation construction technique is used for the construction of ground temperature air-conditioner wells. Comparative analyses of the construction process and test data show that in the fine particle areas of unconsolidated sediments, the pumping suction reverse circulation drilling technique for construction of the ground temperature air-conditioning wells has a significant advantage on the construction schedule, the increases in the amount of water and recharge volume, and can provide a reference for the construction of ground temperature air-conditioner well in similar areas.