By Liz Hampton (Reuters) – Schlumberger, the world’s largest oilfield services provider, is rebranding itself with a new name, color scheme and logo that underscores its ambitions for a lower-carbon future, the company said on Monday. The nearly 100-year-old firm, originally named after its founding family, has become a giant in oilfield services and equipment such as drilling and subsurface analysis. But it has shed old line products and recast itself as a digital services provider and supporter of cleaner energies. The rebranding is not a shift away from fossil fuels, Chief Executive Officer…