In selecting the most suitable type of drilling fluid, many different factors must be considered. Overall what is required is a mud system that gives the lowest overall cost of drilling each hole section, except for through the reservoir. The direct cost of the fluid itself (the cost per barrel of mud) is but one component of this overall cost. If serious hole problems occur because the mud was not optimized for the formations in an effort to “save money,” obviously much more money will be spent than would have been saved on the mud bill.Continue reading “Designing the Drilling Fluid”
Drilling operations in waters deeper than 3,000 ft are increasing throughout the world, and the industry is considering the challenges imposed by ultradeep waters. Leases have been obtained in water depths up to 10,000 ft, with the requirement that they be drilled within the next decade. Use of current technology to drill these leases will require extremely large floating drilling units and large-diameter marine-riser systems.Continue reading “DUAL-DENSITY MUD SYSTEM FOR DEEPWATER DRILLING OPERATIONS”
The presence of large amounts of drilled solids in a drilling mud usually
spells trouble for the drilling operation. These solids adversely affect the performance characteristics of the mud and can lead to a multitude of costly hole problems.
Water as a drilling fluid does not qualify as a mud. If there are no hole (formation) problems that prevent its being the most economical drilling fluid; if neither the geologist, palentologist, nor production supervisor have valid objections; and if it is available, water is seldom if ever surpassed. When the formation requires, or a supervisor demands , filtrate control and / or viscosity and /or gels in the drilling fluid, a “mud” is built. Or if the fluid density required is too high for salt water alone , mud properties are required to suspend barites.