FAQ

If you have any other questions about our Open Hole Net™ please send them to: wade@5doilfieldmagnetics.com

Q: What is the heaviest object caught by the Open Hole Net™?
A: The heaviest object caught to date is a 36”, 18 pound pipe wrench. This was tested in water and dropped from three feet, with pipe in the wellbore.

Q: What sizes does the Open Hole Net™ come in?
A: The Open Hole Net™ can be configured for 7 1/16”, 11”, 13 5/8’’, 16 ¾”, and 18 ¾” bore BOP arrangements.

Q: What fluids have been used in testing the Open Hole Net™?
A: The only fluid used is water, as this has no viscosity and is the least buoyant fluid. It is also the “worst case” scenario. Almost all well bore fluids will have a little viscosity, even if the fluid is dirty saltwater.

Q: When the pipe is pulled out of the hole on a trip and the fluid level drops, can you still catch objects?
A: In many cases with fluid out of the wellbore and pipe in the wellbore as when tripping out, the ability to catch objects is improved because the pipe in the wellbore has a temporary-induced magnetic field, which enhances the ability to catch items.

Q: Can the Open Hole Net™ be used with tools that could be damaged by a strong magnetic field?
A: The Open Hole Net™ has been developed to remove of the magnetic field strength from the internal diameter of the system so that tools can be passed through it without damaging the systems (LWD, MWD). Baker Hughes, Schlumberger and Halliburton’s MWD services have been made aware of these values.

Q: How do you remove objects (tools and /or swarf) caught in the Open Hole Net™?
A: The caught objects are removed by draining the fluid from the Open Hole Net™ (the BOP stack does not have to be drained). Then the doors are opened in a specific sequence. Depending on amount of metal caught, this can be done by one man.

Q: How long does it take to check the Open Hole Net™ for objects?
A: Based on lab testing experience, it will take about 10 minutes.

Q: What is the power source for the Open Hole Net™?
A: There is no power source required for the Open Hole Net. It uses magnetic force furnished by magnetic material that is in the system.

Q: Does the Open Hole Net™ have any temperature limitations?
A: The Open Hole Net will operate with no issues between the temperatures of 480 degrees F and -76 degrees F.

Q: Is a technician or rig up crew required for the Open Hole Net™?
A: The Open Hole Net™ does not need a special rig up crew. The rig crew (Roughnecks and Roustabouts) will rig up the Open Hole Net™ in the same way they rig up the old style bell nipple. No technician is needed for operating the Open Hole Net™.

Q: What are the maintenance requirements for the Open Hole Net™?
A: The Open Hole Net™ is made of stainless steel (completely) with all components contained as a single, integral unit. No pieces can drop off unless they are ripped off. The magnet system is in an environment that never sees any type of fluid, but the system requires periodic checking of the door hinges.

Q: Can the Open Hole Net™ be used with the Dutch lubricator system?
A: The Dutch lubricator system can be used in conjunction with the Open Hole Net™. The Dutch lubricator flange sits on the annular preventer and the Open Hole Net™ sits on this flange.

Q: What kind of fluid can be used in the Open Hole Net™?
A: The Open Hole Net™ can handle any fluid that a normal bell nipple would handle. The Open Hole Net’s™ seals are standard Viton. If there are any special fluids that Viton can’t handle or use, these are considered special order.