Water well drilling rigs should adopt different geological structures during the drilling process. Different methods should be used to achieve good results. The different geological formations encountered are also necessary. Quicksand and gypsum layers are often encountered.
In this case, once the gypsum hinders the drilling process of the water well drilling rig, calcium ions can be removed by adding soda ash, decalcifying agent and viscosity reducing agent. At the same time, the viscosity reducing agent also has strong resistance. The ability to resist calcium can be used to control viscosity and compensate for fluid loss agents. Anti-collapse agents and other materials maintain the stable function of drilling fluid for water well drilling rigs.
1. Gypsum layer: Before the water well drilling rig enters the gypsum layer, the drilling fluid of the drilling rig is pretreated to reduce the solid phase, lower the viscosity and reduce the shear, and participate in the anti-gypsum treatment agent (such as soda ash, decalcification and viscosity reducer), and prepare the gypsum layer treatment agent in advance according to the construction materials of the neighboring hoistway. Improve the pH value of the drilling fluid of the water well drilling rig, and improve the anti-gypsum pollution performance of the drilling fluid of the water well drilling rig.
2. Quicksand layer: It is necessary to increase the viscosity of the drilling fluid and the content of bentonite in the drilling fluid of the water well drilling rig during drilling. Generally, the requirement is greater than 10%. Use a single seal to enhance the wall construction performance of the drilling fluid of the water well drilling rig machine. After appropriately reducing the upward displacement and reducing the erosion of the quicksand layer, it is necessary to seal the well section with thick mud with a viscosity greater than 80s before the trip to ensure the smooth drilling of the small drill, electrical testing and casing operation of the water well drilling rig.
3. Quartz sandstone: Quartz sandstone is formed as a result of sedimentation, and is a very hard rock. In the drilling process of water well drilling rigs, the holes drilled and drilled are relatively shallow (30-200 meters), so diamond drill bits are usually used. When using clean water automatic pulping to produce drilling holes, it usually shows that the footage is very slow, one meter may show two meters of sand, the drilling tools are very hard, there are a lot of slag and gravel, and the drilling incident is buried up. Therefore, a specific understanding of this terrain is required.