Gents, API Spec. Q2 was an industry mitigation effort post Macondo / Deepwater Horizon tragedy in 2010.
API Spec. Q1, Specification for Quality Programs for the Petroleum and Natural Gas Industry, Eighth Edition (addenda 1) is aligned with ISO 9001 has many more requirements. It is also known as ISO TS 29001 which is Q1 without Annex A (requirements for applying the API Monogram).
The API Spec. Q2 initiative begain circa September 2010 and was published in December 2011; it is entitled: Specification for Quality Management System Requirements for Service Supply Organization for the Petroleum and Natural Gas Industries.
Think Q1 for manufacturing / think Q2 for services. Although a quality management system can be certified to Q1, it is mostly tied to the American Petroleum Institute's (API's) Monogram Program and licensing to use their product specifications.
Q2 was initially meant for the Gulf of Mexico, but interest has soared internationally. If you think about it, it continues where product quality (Q1) leaves off.
Q2's Application states in part "...It is intended to apply to the execution of upstream services during exploration, development and production in the oil and gas industry. This includes activities involved in oil and gas well construction, intervention, production, and abandonment. This document applies to activities associated with well servicing, equipment repair/maintenance, and inspection activities...."
Realistically, Q2 could apply to drillling, cemmenting, fracing, running casing, well logging, etc. While the certification requirements have not yet been set in stone, industry studies are in process and an announcement will be forthcoming as to "when" an organization will be able to apply for certification.