Selecting appropriate drilling fluid materials is crucial to ensuring the smooth execution of drilling operations. When choosing drilling fluid materials, the following factors must be taken into consideration:
Geological Conditions: Geological conditions vary across different regions; therefore, it is essential to select drilling fluid materials that are suited to local circumstances. For instance, for loose sandy formations, a drilling fluid with lower viscosity is required; conversely, for hard rock formations, a fluid with higher shear strength should be selected.
Drilling Objective: Different drilling objectives necessitate the selection of different drilling fluid materials. For example, if the objective is to delineate oil and gas reserves, a drilling fluid with higher density is required; whereas if the objective is to extract oil and gas, a fluid with superior lubricity should be chosen.
Engineering Requirements: Varying engineering requirements call for the selection of specific drilling fluid materials. For instance, for deep and ultra-deep wells, a drilling fluid with low fluid loss is required; whereas for horizontal and highly deviated wells, a fluid with superior lubricity should be selected.
Environmental Regulations: Environmental requirements must be taken into account when selecting drilling fluid materials. Priority should be given to selecting non-toxic, harmless, and biodegradable materials whenever possible to minimize environmental pollution.
Cost Considerations: Finally, cost requirements must also be considered. Provided that drilling efficiency and safety are fully ensured, one should endeavor to select lower-cost drilling fluid materials to help reduce overall drilling expenses.
