Pressure housings: Simple in concept and nuanced with details.
National K Works expertly manufactures and tests pressure housings to your exact specifications and needs. We are precision specialists who engineer, manufacture, and test high pressure high temperature solutions. Our products are known for their exceptional reliability, and our well-known service is highly customer-focused in every detail. We have a strong record of demonstrated competency and expertise. Contact us today to ask any questions you may have or discuss the details of your pressure housing manufacturing and testing needs.
We have the manufacturing and engineering expertise to execute your downhole pressure housing design and manufacturing to your exact specifications. All of our pressure housing work is custom to our clients' designs and needs.
We are driven by our core values to deliver the highest quality of work and service. Our clients usually work with us on a long-term, repeat basis, and our clientele includes some of the world's largest corporations that rely on our exceptional performance and proprietary manufacturing solutions. Our clients work with us again and again for their precision pressure housing projects for a number of reasons, including our:
Pressure barrel, Instrument Barrel, Pressure vessel, Sonde housing
A down hole pressure housing is a precision tube of high strength material with sealed ends that houses and protects downhole instruments from wellbore fluid and external hydrostatic forces.
Concentricity between ID/OD (uniformity of wall thickness), Precision of ID and OD size and shape, Straightness, Precision of machined end closures, Welding, Material properties, Pressure testing
Common materials are 17-4 stainless, Nitronic 50, Inconel 718, Copper Beryllium, Copper Nickel and Titanium Alloys.
Most pressure housings are made from bar material that is deephole drilled to produce a precision tube. Mill produced tubing requires large volume minimum orders and consequently has high initial costs. National K Works specializes in economically producing precision tube from bar material via Cobore. Typical OD sizes range from 0.75" (19mm) for slim hole production logging tools to 5.0" (127mm) for ultra-high pressure deep water open hole logging tools. Lengths have ranged from 6" (152mm) to 216" (5.5m). Longer lengths are easily manufactured.
Concentricity (uniformity of wall thickness) is one of the most critical yet under toleranced features of a pressure housing. National K Works specializes in producing tight concentricity tolerances between the ID and OD. Our standard tolerance is 0.010" (0.25mm) maximum positional tolerance between the ID and OD (+/-0.005" (0.13mm) maximum wall thickness tolerance) along the entire length of the pressure housing.
National K Works specializes in machining precision threads, blunt starts on threads, critical seal bores, fluid porting (radial and axial) features, internal cavity features for latching and orienting chassis and connectors, internal and external tool joint orientation features, external identification bands for depth correlation of sensors, deep bore internal chambers for seal ramps and connector guidance.
Welding is performed on National K Works' proprietary welding machines that have program controlled variables pulled from a library of welding procedures. Joints are not welded by hand. Weld joint integrity is verified during pressure testing. Thin cross section welds like those found on internal gas chambers are verified with Helium leak testing.
Housings are straightened prior to machining end features to ensure perpendicularity to centerline. Critical fits between chassis and bore are verified with a functional "drift" specimen that replicates the chassis and its fit to the pressure housing.
When critical multi-bore sealing configurations are inaccessible with conventional measuring tools (such as those on formation testers), National K Works verifies the position of the bores using National K Works designed gage fixtures that replicate the actual functions of the mating parts.
Pressure testing verifies the mechanical integrity of the pressure housing and the seal integrity of all the connections on a pressure housing. It is a crucial risk management test to avoid failures in an actual well. National K Works pressure tests to 35,000 psi (241MPa) maximum at ambient temperature. We have made, and have in inventory, seal testing fixtures for over 400 different tool joints used across the industry.
If you are looking for an expert and precision company to manufacture and test pressure housings, don't hesitate to contact us today to ask any questions you may have or discuss the details of your pressure housing manufacturing and testing needs.