Sanjel Energy seeking patent for new cementing technology for more complex wells

Image: Sanjel Energy Services/Twitter

Sanjel Energy Services has developed new technology for improved cementing for the longer, more complex wells that have become standard in the Western Canada Sedimentary Basin.

The company, which reports completing more than 18,500 service jobs since the launch of the company in 2016, has a patent application underway for a technology it calls VISWEEP DM IS.

Sanjel Energy President Murray Bickley said the system improves on more simple past cementing technologies, while improving efficiency.

A simple mixture of water and fluid worked well for conventional vertical wells with depth around 3,500 to 4,000 meters, but adding long horizontal sections requires additional design, he said.

Wells today are often 2,500 meters in vertical depth, with horizontal sections that can extend 6,000 meters.

“You have to have a far more engineered cement now to be able to handle those key changes. In order to achieve an effective cement bond, you have to have much better mud displacement efficiency and hole cleaning, and so this is why we’ve designed VISWEEP DM IS.”

The system is a spacer that is designed to enhance displacement efficiency to deliver improved bond quality, Sanjel Energy says.

It’s described as a fully dry combination of oil-cleaning surfactants, rapid hydrating polymers and optimal weighting materials that converts casings and formations from oil-wet to water-wet for improved cement bonding.

“As drilling operators trial hole and casing size configurations to optimize drill speed and completion performance, the volume of spacers required to meet industry best practices are becoming larger than the tanks of cement pumping units,” the company says.

“VISWEEP DM IS is mixed on-the-fly utilizing the same equipment and procedures as mixing a cement slurry.”

The spacer is mixed in minutes and pumped directly downhole, Sanjel Energy says.

The technology is expected to improve cementing performance with reduced total well cost, project complexity and hazard exposure.

Bickley said the company expects to receive the patent in 2020.

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