Can't research Oil processing with Bob's mods (no Angel's). It's unavailable with only Electronics as prerequisite. Disabling Omnimatter opens "Pumpjack research" as second prerequisite.

What mods are you using exactly?

Some mods are updated since my post. I've also unlocked pumpjacks via console, so I can't reproduce this bug now.

Big_Brother_Bobs_plugin_0.1.2\
rso-mod_3.3.9\
advanced-logistics-system_0.5.1.zip
AfraidOfTheDark_1.0.16.zip
Aircraft_1.3.7.zip
alien-biomes_0.2.7.zip
angelsinfiniteores_0.6.11.zip
auto-research_3.3.1.zip
AutoDeconstruct_0.1.8.zip
autofill_1.4.8.zip
beltplanner_0.11.0.zip
Big_Brother_0.4.3.zip
bobassembly_0.15.6.zip
bobelectronics_0.15.2.zip
bobenemies_0.15.2.zip
bobgreenhouse_0.15.2.zip
bobinserters_0.15.1.zip
boblibrary_0.15.8.zip
boblocale_0.15.4.zip
boblogistics_0.15.6.zip
bobmining_0.15.2.zip
bobmods_gfxtweak_0.15.3.zip
bobmodules_0.15.3.zip
bobores_0.15.6.zip
bobplates_0.15.11.zip
bobpower_0.15.3.zip
bobrevamp_0.15.4.zip
bobtech_0.15.3.zip
bobvehicleequipment_0.15.2.zip
bobwarfare_0.15.3.zip
Bottleneck_0.8.5.zip
BottleneckLogistics_1.2.1.zip
bullet-trails_0.2.4.zip
Crafting_Speed_Research_0.1.5.zip
Enhanced_Map_Colors_1.4.1.zip
even-distribution_0.2.4.zip
EvoGUI_0.4.203.zip
FARL_1.1.1.zip
folk-stopthat_0.1.2.zip
hacked-splitters_1.1.0.zip
HandyHands_1.5.1.zip
LoaderRedux_1.0.1.zip
ModuleInserter_2.0.3.zip
Nanobots_1.8.2.zip
omnimatter_1.1.7.zip
PavementDriveAssist_2.1.1.zip
PickerExtended_2.7.3.zip
Rampant_0.15.15.zip
ratiotree_0.0.8.zip
Squeak Through_1.1.7.zip
upgrade-planner_1.2.18.zip
vehicles-equipement-grid_0.15.0.zip
WaiTex_Full_1.2.3.zip
Warehousing v15_0.0.13.zip
what-is-it-really-used-for_1.2.5.zip

I had the same issue with not being able to research oil processing, although in my case I was running the full Bobs + Angels suite with the exception of Angels Petrochem and smelting

Requirements for oil processing are still set to pumpjack (no bob, or disabled bob PJs) or pumpjakc1 if bob selected. You should change prerequiste from any pumjack to omniston-1 as without it you cant create oil anyway and technology is pointless to have

I ran into the same issue as Razunter.
Playing with Bob's and could'nt research Oil Processing. As a workaround I used this console command to unlock the tech anyway.
/c game.player.force.technologies["oil-processing"].researched=true