In the process of using any product, it shall comply with its usage requirements. Of course, the composite bit is no exception. During use, water flow should be increased as much as possible. This effectively prevents rock breakage and makes the walls of the well smoother, which reduces resistance to drilling and increases the overall rate of production. Today, the composite bit is widely used in geological exploration and drilling construction.
What do you need to know before using a composite bit?
(1) Drilling parameters: The determination of bit weight and speed not only determines the rock crushing rate of the cone bit, but also affects the wear of the teeth and bearings of the cone bit. Shallow Wells and soft formations typically use high RPM and low drilling weight. Medium-hard formations are typically drilled with medium rates and medium-high weights. Deep Wells and hard formations typically use higher weight on bit and lower velocities.
(2) Well section structure: Different wellbore structures have special requirements on the size, type and use of cone bit. Collect data such as borehole structure, selection of cone bit and operation parameters, and confirm whether the selection and use of cone bit is reasonable according to the failure form of cone bit.
(3) Well location: Rocks at different locations in the earth's crust have different mechanical properties. Deep buried rock is in a state of multidirectional compressive stress, which reduces the porosity of the rock and increases its strength. In the upper part, the rock is usually soft, and the cone bit has a high rotation rate and lower drilling pressure. The lower section is typically hard and abrasive, with low RPM, high drilling pressure, and long service life. The hardness, plasticity, brittleness, abrasion and drillability of formation rocks are analyzed based on the collected well location and the lithologic drilling record per meter, and the selection and use of pressure bit is determined according to the failure form of roller.
(4) Formation lithology: different lithology, formation softness and hardness, different lithotripsy mechanism and different forms of failure of cone bit. Record and drill based on the lithology and lithology per meter of the strata collected at the site. Analyze the hardness, plasticity, brittleness, abrasiveness and drillability of the formation rock, and compare the failure form of the cone bit to confirm whether the selection and use of the cone bit is reasonable.
