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

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.