Chapter Summary:

Where & how: Mumbai High sits ~160 km off Mumbai; jack‑up rigs anchor on the seabed, lift clear of waves, and drill through ~75 m of water and 1–2 km of rock.
Bits & mud: Tricone and diamond bits cut rock while drilling mud cools, carries cuttings, and balances pressure to prevent blowouts.
Control: The Blowout Preventer (BOP) is the last neck‑choke on runaway pressure. Directional drilling later fans wells like a clock face to tap more reservoir with fewer platforms.
Fail‑safe design: Sub‑Surface Safety Valve (SSSV) and Surface Safety Valve (SSV) stay closed by default; only hydraulic/pneumatic pressure opens them. Loss of pressure → automatic shut‑in.
Takeaway: Successful drilling is part geoscience, part mechanical art, and mostly disciplined pressure management.


Additional Notes:

What was once called Bombay High is now referred to as Mumbai High. The red dot in the map shows it location.

Since the depth of the sea in this area is not very deep, the three-legged jack-up rigs discussed in the chapter worked well to dig newer wells. If the depth is much more, as is the case in many other offshore fields around the world, jack up rigs may not work well. In those cases other model rigs that float are employed.

A short video about offshore oil exploration & drilling: https://youtu.be/3QpcSzfJBx0

There are a lot of movies and TV shows that show well blow out. It is a scary proposition since the blowout provides an unending supply of easily combustible fuel!

This video talks about a confusing mish/mash of units of measurements used in this field:
https://www.youtube.com/watch?v=sdWEGzWFcCc