Few pipelines operate at maximum (nameplate) capacity and an increase in capacity operation might handle the extra volume.
This effort could be greatly limited or mitigated in effect.
No, the Russian pipelines for oil to China are near capacity. The ASPO pipeline does 500-600K bpd and another 200K bpd is intermixed in the Khazak pipeline, with Khazak oil.
The big Power of Siberia pipelines are for nat gas, with one underway and the other in construction.
These sanctions are going to be hyped, but I do not see anything significant in all this, especially with Russia having its own central bank and a much larger population.
Overall, it looks much like the ongoing effort to fight the war in the media. When this fails, the next steps start to get dangerous, though by then the geography on the ground may have become compelling.