Steady under pressure
When the proper system is in place, costs and cycle times can be reduced, and give a drilling operation a competitive edge. For fluid pumps in frac plug drillouts, the perfect amount of horsepower must be achieved for continuous-duty operation. A constant rate and pressure ensures smooth drilling operations while maintaining a turbulent flow to remove sand and debris from the wellbore. If a pump fails, circulation is lost and equipment may get stuck downhole. This issue costs customers time and significant revenue waiting on repairs or a pump replacement.
The pump must also be able to operate over a broad range of requirements, with pump pressures up to 10,000 psi (690 bar). Based on Axis and Freemyer’s vast experience, the 1500 hp mtu Series 2000 Tier 4i engine was chosen for its optimal combination of power, fuel consumption and reliability. “A 2250 or 2500 horsepower engine would be overkill. The 1500 horsepower Series 2000 really hit the sweet spot for performance and efficiency,” says Freemyer.
It’s critical for a pump to be productive without being overtaxed. An underrated piece of equipment may cause a failure that injures employees. It also increases fuel costs, which add up quickly at a job site, where multiple units are burning up to 1500 gallons per day. “On average, we burn from one-half to three-quarters of a gallon every minute on these units. When you send a lower horsepower unit out to do the same amount of work, you can burn more fuel because it gets overloaded. And if you go with a 2250 horsepower engine, that burns a lot of fuel, too. It’s a double-edged sword. Both a pump that’s too small or too big ends up burning more fuel. Yet that’s what most of our competitors are doing,” says Moses.