This is partly off-topic as BRK has no investment in XOM. However the technological advancement discussed could also be used by OXY and CVX in which BRK has big investments.

In rural west Texas where oil rigs and pump jacks dot the sparse flat ​landscape, an ExxonMobil contractor sits in a small office on a drilling rig, using controls on a screen to operate robotic ‌machinery and move tall steel pipes weighing roughly 2,000 pounds.

This work would usually require human overseers standing on the rig floor, the most common location for accidents on a rig.

Exxon, the largest oil producer by volume in the U.S., operates more than 30 drilling rigs in the Permian Basin, two of which are automated rigs with robotic equipment. By 2028, the company ​aims to transition half of its fleet to automated rigs to reduce the need for workers to perform potentially dangerous work and increase ​efficiency to drill wells faster, an executive told Reuters.

Exxon plans to grow its Permian production by almost 40% to 2.5 million barrels of oil equivalent per day by 2030. By contrast, rival oil major Chevron plans to hold production steady at about 1 million boepd, focusing instead on free cash flow.

The automated drilling rigs are part of a combination of technologies and strategies Exxon ​is using to boost production, said Bart Cahir, Exxon's senior vice president of unconventionals, in an interview on the rig.

reuters.com - Exxon turns automated drilling permian push higher oil output