National Oilwell Varco (NOV) is the leading provider for the worldwide oil and gas industry and has been dedicated to providing the highest quality oilfield products and services for more than 140 years. National Oilwell Varco is the single source for all of your rig equipment, integrated systems, downhole tools, and supply chain solutions. From a spare part to a comprehensive drilling system — and from a generic valve to a fully integrated supply chain process, National Oilwell Varco delivers unlimited customer solutions. By constantly developing and acquiring new technologies and services to better serve future customer requirements, National Oilwell Varco will continue to be the premier source for diversified products and
services worldwide.

National Oilwell Varco has a broad range of equipment, systems and components for Land Rigs and Semi-submersible Rigs worldwide.

National Oilwell Varco's contact directory.


Testing Services:
National Oilwell Varco's Tubscope proven testing services have helped oil & gas companies from all over the world maximize their production
efforts with safe, efficient means of detecting leaks in oil country tubular goods. From our beginning, we've set the standard in developing the
best means to help ensure operators that costly leaks are discovered at the rig floor, before they are run downhole.

We introduced external testing to the industry in 1969 as the solution to problems operators were encountering with internal water testing,
mainly not detecting leaks in tubular connections. The failure of internal testing in consistently determining a connection's integrity led to
several new products in the 1970's. However, the only way to determine if a connection will perform under pressure is to test it with pressure,
applied in such a way as not to mask the very leak that you are trying to find in the first place.

The mission of Tuboscope is more than just leak detection. It includes understanding how connections work, knowing what causes them to fail
and recommending innovative solutions. Our line of test equipment is designed to meet the needs of our customers in a safe, efficient manner.
We can test tubular goods ranging in size from 1 1/2" to 20", with water, slick water, or gas.

Definition:
Oil Country Tubular Goods (OCTG) refers mainly to casing and tubing but also can refer to line pipe and other pipe used in producing or
transporting gas and oil. Casing is the pipe that is used while drilling the well. It is placed in the well, cemented in place, and is what keeps
the hole from sloughing in while drilling or producing. It “cases” the open hole. It comes in sizes ranging from 30” to 3 ½” in diameter.
Usually several “strings” of casing are using in each well. Tubing is the pipe that is inserted in the well during well completion operations.
This is the pipe by which the oil and gas flows to the surface. It is frequently removed from a well during workover or completion operations.
Tubing comes in sizes from 4 ½” to 1 ½” diameter. Casing and tubing each use special connectors in order to screw the joints together.
These connectors are called connections and come in all types of sizes and thread profiles depending on the intended use. A joint of tubing
or casing is made up of the “tube” and the “connection.” Connections are sometimes separate items called couplings or they can be integral
or a part of the tube. Again, the intended use dictates that type of connection. Line pipe is a separate type of tube from tubing and casing.
Line pipe is what makes up a pipeline. Pieces are connected together by welding. Line pipe is less expensive and less rigorously used than
tubing or casing.

Definition written by GLG Experts.