As Andres has rightly said, Tenaris has the ability to cover your needs; with an extensive product portfolio certified to API 5CT, and partnerships for API 5CRA. Tenaris has mills cut across the various continents, with an OCTG mill also present in Italy, Europe i.e.: Dalmine mill.
In addition, Tenaris has local presence in Nigeria, registered as a Nigerian entity (Tenaris Global Services Nigeria), and with an in-country threading plant in Onne, Rivers state of Nigeria. The Rig Direct model might also be a good fit for your project, relieving you of the stress and inherent costs of storage and logistics, and supplying the pipes right when you need it.
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to make contact and discuss in more details.