深井填砾工艺关键技术探讨

Discussion on Key Technology of Gravel-filling for Deep Well

在河北平原新近系地热井施工时采用填砾工艺具有防砂、稳定孔壁的优点,但具有一定的施工难度。通过实践应用提出了管孔径级配方案,总结了终孔替浆工艺,分析并论证了填砾数量计算方法、填砾速度的确定原则及静水填砾方法的可行性。

In the construction of geothermal well in neogene in Hebei plain,gravel-filling technology was adopted with the advantages of sand control and borehole wall stability.Based on the practice,the paper put forward the gradation scheme for pipe diameters,summed up the mud replacement technology and analyzed the calculation method for gravel-filling quantity,principle of gravel-filling speed and the feasibility of static water gravel-filling.