Geothermal well mud refers to the mud used for drilling geothermal Wells. How to deal with geothermal well mud? The most prominent feature of geothermal well mud is resistance to high temperature, high temperature will lead to mud clay dispersion due to high temperature, thickening, and even solidification phenomenon, damage the mud performance, resulting in wall collapse, borehole overwarp, diameter reduction, drill mud pack, plugging closed production layer and so on. Therefore, mud treatment of geothermal well is a key problem in geothermal drilling. Geothermal well mud treatment process must be equipped with the corresponding professional solid phase control equipment, the use of geothermal well mud selection is mainly based on the specific temperature of the geothermal well.

Geothermal well mud has the following characteristics:

1) Control blowout: high-density mud is not suitable

2) Mud treatment agent: Due to the high temperature of the geothermal well, the mud treatment agent is guaranteed to be above 150℃ to maintain stable mud performance.

3) Heavy metal preparations: strictly prohibited to prevent environmental pollution.

4) Fine solid particles: ensure that the solid particle content is the lowest value.

5) Mud treatment equipment: solid phase control equipment must be configured

Geothermal well mud system requirements:

1) Conventional mud is used to drill the surface covering layer.

2) Low solid mud is used from the bottom of the surface layer to above the hot reservoir.

3) High quality mud is used to drill through hot water hot reservoir, and low term bentonite mud is used when well temperature is lower than 200℃; The well temperature above 200℃ adopts sepiolite mud.

According to the above characteristics and application requirements of geothermal well mud, the most important principle of geothermal well mud treatment is to meet the requirements of mud temperature resistance.