句容赤山湖地热井成井工艺方法

Drilling Technology of Chishanhu Geothermal Well in Jurong

摘要:

江苏句容出露发育广泛白垩系红色细砂岩、泥质砂岩，浅埋于松散层之下，水文地质条件极差，地下水贫乏，钻井多数为干孔。通过钻探施工，句容赤山湖地热井先期排水量在2～3 m3/h，通过对其地质含水条件的分析，提出了应用深水泵与“脉动排砂法”，分选抽水层位等新的施工、洗井、抽水工艺理论，最终使该井日产高达500余m3。该井的成功对贫水地层找水以及碎屑岩区洗井排水具有巨大的借鉴意义与实用价值。

Abstract:

Widely developed Cretaceous red sandstone and argillaceous sandstone outcropped in Jurong of Jiangsu, which were shallowly buried in unconsolidated layers under very poor geological conditions. Because of the shortage of groundwater, most drilling encountered dry holes. Only by simple drilling, the initial output of the geothermal well in Jurong was about 2～3m3/h. After the analysis on geological conditions of water-bearing, some new process theories of construction, well washing and pumping were put into application: deep water pump and “sand discharge by pulsation”, and sorting pumping horizon; water output was up to more than 500m3/day. The success in this well has practice value with reference significance to the water research in water-lacking layer and well-flushing in clastic rocks.