With Saudi Arabia doing an IPO on their largest oil company in latter 2018 tells me that they think oil will be higher then and also that sentiment will have improved for the oil market by then as well (causing investors to be even more excited about their IPO). https://www.cnbc.com/2017/10/23/saudi-aramco-public-offering-is-on-track-for-2018-ceo-amin-nasser.html

In 1973, following US support for Israel during the Yom Kippur War, the Saudi Arabian government acquired a 25% stake in Aramco. It increased its shareholding to 60% by 1974, and finally took full control of Aramco by 1980, by acquiring a 100% stake in the company. It looks to me like the Saudis are attempting to monetize the company without giving up full control. That way they can recoup some of their dwindling revenue due to lower oil prices, while at the same time retaining a controlling position should oil prices somehow rebound.

They'll be going public with a small percentage of the company, yet it will likely reap a ton of dollars for them that they can use to diversify into other things.