There are many companies that are invested heavily in the oil drilling industry. It is not just the companies that are searching for thee oil and the ones that are producing the oil that are working hard to get the product that people are demanding. There are many other industries that rely on the drilling companies to support their business. When a company drills a well they need to be able to get the equipment they need to do the job. That means they need to have oil drilling equipment companies that can provide them with the things they need to find the oil. Drilling a well and producing oil from that well require different types of equipment. Most drilling companies have contracts with the equipment companies to supply them with the things they need to drill the well and then they return it once the well is drilled and they switch to producing oil from it. The equipment that is used to drill a well is used over and over again for the companies that supply it.