Please consider making the oil rig produce multi phase oil instead of crude oil (like other pumpjacks do) when angel's petrochem is enabled.

I have the same request, and after some research it seems we can modify oil_rig.lua line 19
local deep_oil=table.deepcopy(data.raw["resource"]["liquid-multi-phase-oil"])

however it doesn't work.

just now, it worked, just need to add one more line after line# 240, after data extend:

data.raw["resource"]["deep_oil"]["minable"].results={{type = "fluid", name = "liquid-multi-phase-oil", amount_min = 10, amount_max = 10, probability = 1}}

hope it can help other people who is looking for this.

thanks for the input, angles petrochem is now an optional dependency of the mod, and if installed, deep sea oil will produce multi phase oil