Would have liked an "estimate" of downtime on frac tree...

Would have liked an "estimate" of downtime on frac tree components to be replaced before
fraccing operations can re-commence. This is where uncertainty re the SP will prevail. I also notice they
had to set 2 isolation plugs between stage 1 and stage 2, the first having failed to set. That is not
uncommon in some of the fracs I have followed in the US.

What components however are being replaced? Is it the tubing or frac lines, is it a faulty pressure
release valve?
Not sure I am on the right track here and maybe
getting a bit technical. This is an excerpt from a fraccing procedures manual by Schlumberger
detailing contingency procedures ;

MAIN FRACCING TREATMENT Carefully raise the pressure to 520 bar (7500 psi) to re-test the PRVs. Hold pressure against the PRV for 15 minutes as a leak-test. During this period the surface lines should be visually inspected for leaks. If the PRV fails to hold pressure, re-set and re-test If a satisfactory test cannot be obtained, it may become necessary to limit the treating rates and pressures during the Main frac treatment. Once the test has been completed, bleed off the pressure. PRV = pressure release valve.

I take it from this that IF remedial action were not taken {ie a satisfactory test cannot be obtained PRV
fails to hold pressure because of a leak} then further fracture stimulation can proceed but at a less than
desired rate.

In the case of OEX ; During the system wide pressure test to 9,300psi prior to the Stage 2 frac, a leak developed in the “frac tree”. The decision was taken to replace the faulty component(s) with spare components pre-positioned at the well site, before proceeding further with fracture stimulations. Nice to see spares on site.

So in my mind, do nothing & proceed with fracture 2,3 & 4 with the risk of reduced flow rates OR address
the problem now and maximise future fraccs and flow rates. Not sure if removing the tree will damage
reservoir and flow rates as you suggest but on the above contingency measure, doing nothing would
certainly affect outcomes.

Timeline on re-commencement of fraccing would have been desirable, however successful mini frac
and stage 1 frac, together with good pressure at 5000psi bodes well. Glad it IS only 4 stages rather
than a 12-15 stage frac at this stage. Complex, especially in a new basin, milling of plugs also to
complete successfully, however " Cambay-77H has a modified completion with cemented 4 ½” production casing to minimise risk associated with post-frac milling operations. A shorter lateral section (350m) in Cambay- 77H coupled with a conventional “plug and perf” method is expected to facilitate the primary goal of the well – recording hydrocarbon flow information at surface during a production test.

Very happy once again to have Schlumberger running the show.

GLTAH