Drilling fluid system details
发布时间:2016-10-11 10:12:22

Drilling fluid system in this text means the whole drilling mud system including the fluids, the equipment, auxiliary part.

Drilling fluids types

Drilling fluids are classified according to the type of base fluid and other primary ingredients:

. Gaseous: Air, nitrogen

. Aqueous: Gasified—foam, energized (including aphrons) Clay, polymer, emulsion

. Nonaqueous: Oil or synthetic—all oil, invert emulsion 

Drilling fluids function for well drilling

A drilling fluid, or mud, is any fluid that is used in a drilling operation in which that fluid is circulated or pumped from the surface, down the drill string, through the bit, and back to the surface via the annulus. Drilling fluids satisfy many needs in their capacity to do the following:

.  Suspend cuttings (drilled solids), remove them from the bottom of the hole and the well bore, and  release them at the surface

.  Control formation pressure and maintain well-bore stability

.  Seal permeable formations

.  Cool, lubricate, and support the drilling assembly

.  Transmit hydraulic energy to tools and bit

.  Minimize reservoir damage

.  Permit adequate formation evaluation

.  Control corrosion

. Facilitate cementing and completion . Minimize impact on the environment . Inhibit gas hydrate formation

Drilling fluid system

The most critical function that a drilling fluid performs is to minimize the concentration of cuttings around the drill bit and throughout the well bore. Of course, in so doing, the fluid itself assumes this cuttings burden, and if the cuttings are not removed from the fluid, it very quickly loses its ability to clean the hole and creates thick filter cakes. To enable on-site recycling and reuse of the drilling fluid, cuttings must be continually and efficiently removed. 

Separate solids out of drilling fluid

The types and quantities of solids (insoluble components) present in drilling mud systems play major roles in the fluid’s density, viscosity, filter-cake quality/filtration control, and other chemical and mechanical properties. The type of solid and its concentration influences mud and well costs, including factors such as drilling rate, hydraulics, dilution rate, torque and drag, surge and swab pressures, differential sticking, lost circulation, hole stability, and balling of the bit and the bottom-hole assembly. These, in turn, influence the service life of bits, pumps, and other mechanical equipment. 

​We get the solids moved out of drilling fluid for better drilling performance and lower cost on whole project. The equipment to process drilling fluid we can call them solids control equipment or drilling fluid equipment.

Mainly include drilling fluid shale shaker, mud cleaner, decanter centrifuge, centrifugal pumps, mixer, mud tanks, degassers and so on. They will be operated according to different working condition and drilling process.