3M™ Glass Bubbles S35 are hollow glass spheres with a typical density of 0.35g/cc and an isostatic crush strength of 3,000 psi. These glass bubbles are used in many applications including thermoplastics and deep water wet pipe insulation in oil and gas drilling. The bubbles produce strong, stable voids and low thermal conductivity, helping coatings achieve the necessary compressive strength.
Deep Water Wet Pipe Insulation
Higher filler loading
Of the many functions 3M glass bubbles S35 can perform, they stand out for their frequent use in oil and gas applications. Some flowline construction methods, such as pipe-in-pipe, are proving to be impractical and too costly for use at today's deeper depth oil and gas drilling (10,000 ft. /3,000 m. and more). Although pipe-in-pipe offers the best U-value (insulating value) and longest cool-down times, the added weight and bulk of its construction can make it more difficult and costly to lay — and too heavy to support in deeper waters, which is of particular concern when using drilling risers.
Importantly, there are some peripheral subsea hydrocarbon reservoirs that are economically viable at reach-out distances of 31 miles (50 km), or more. Longer subsea pipe lengths coupled with hotter drilling conditions require flowline insulation with increased mechanical strength and reduced heat transfer. 3M glass bubbles provide the solution to this drilling need. Using glass bubbles in deep water wet pipe insulation creates a pipeline that can stand up to demanding depth, pressure and temperature conditions.
Consider the benefits of alternatives such as wet insulated pipe or flexible insulated flowlines. Both options consist of a single pipe coated with 3M glass bubble-filled syntactic foam insulation coatings, such as syntactic urethane. These pipes are less than half the weight of pipe-in-pipe, making them more practical for use at greater depths and in longer runs. Additionally, because this construction reduces overall pipeline diameter, more pipe can be wound per spool, requiring fewer and smaller ships — making installation faster, easier and more economical. Because of these, and many other factors, wet pipe insulation now accounts for the majority of all new deep water subsea flowlines.
Pushing the Limits: a Proud History of Innovation
Hollow glass bubble technology was developed by 3M in the 1960s. Riser buoyancy modules and wet pipe flowline insulation using the first glass bubble-filled syntactic foams were capable of surviving down to 5,000 feet below sea level. Today, advancements in the strength-density ratio of glass bubbles enables these materials to be used at any depth — all the way to the bottom of the ocean — more than 36,000 feet (10,972 meters).
Other Applications and Processes
- Sprayable syntactic foam
- Thermoset polyurethane