What are the construction precautions for drilling stone wells in down-the-hole drill pipes?

Classification:

Company News

Release time:

2019-08-12

【Summary Description】 What are the construction precautions for drilling stone wells in down-the-hole drill pipes?

潜孔钻杆

1.InBefore the well pipe is put in, the hole wall, hole diameter and hole depth of the borehole shall be carried out.Check, find out whether the hole wall is smooth and smooth, and timely repair is necessary when irregular hole walls such as diameter reduction are found to ensure the smooth implementation of subsequent processes, and measure the hole depth.

2.Change the pulp.DTH Drill PipeTo drill stone wellPress thin slurry or clean water into the bottom of the hole, and replace the thick slurry from the bottom up. When the concentration of mud returned to the well and the pressed slurry water is basically the same, the slurry exchange is completed.

3.Down the tube. It is necessary to conduct the downpipe according to the skill demand. To set the well pipe finder, welder operation, and welding2-4A piece of pull plate, if necessary, a floating plate shall be added in the pipe, and the bottom of the pipe shall be welded and sealed with steel plate.

4.Gravel fill. Put the selected gravel material into the annular space between the well pipe filter and the hole wall. According to the demand of geological skills and stratigraphic conditions, the method of stopping gravel throwing, the method of returning water to the outside of the pipe, the method of pumping and filling gravel and other skills are selected.

5.Stop water.DTH Drill PipeMediumCommonly used method for clay ball water stop method. It is necessary to ensure the quality of the clay ball, and ensure that it is filled in layers, filled layer by layer, and filled.

6.Well flushing. The intention of well flushing in Diamond Head is to completely remove the plugging of the aquifer by rock cuttings in the hole during the drilling process, and draw out the mud, powder, fine sand and other deposits in the aquifer around the water filtration pipe together to ensure the water outflow from the aquifer.PassChang.

7.Before the borehole is inspected, it is necessary to conduct a simple pumping experiment to determine the amount of water that can be excavated in practice.30minTake water samples to measure sediment concentration and conduct water quality analysis sampling. Then write a well sinking engineering statement.

8.Borehole inspection, materials and skill standards necessary for diamond head borehole inspection,Bore acceptance form (including well layout, construction skills, water volume, sand content and other materials)DTH Drill PipeMediumBore dimensions and inspection sheets are common and consistent with the delineation requirements..Water output of the wellThe sediment concentration in 100 T/H well water is less1/20million (volume ratio).

Key words:

weilida drill