SPREAD - Sharing Practices Rigorously, Easily Accelerates Delivery

Would like to get any comments on the following scenario.

1. Will be testing high pressure gas on a deepwater well (373m water depth).

2. Test Zone is 6000 meters from rig floor. BHP 13,200 psi (928 kgf cm2) BHT 170 degrees C

3. Well Test Fluid- Gas (0.64 Sp Gr) with some liquid condensate loading

4. We are using a 3.00 in ID Test String with conventional Halliburton subsurface test tools (TST, RD Circulating Valve, OMNI Circulating Valve-double chamber, Select Tester Valve). The OMNI and Select Tester are primary shut-in and reverse circulating valves.

5. Distance between Formation and the Select Valve is 118m (approx 3.3 bbl below the Select valve to the top of the formation)

6. After Testing, we can kill the well by-

a. Close the Select Tester Valve. Open OMNI circulating valve. Reverse Circulate Kill Brine down Annulus and up test string. Close OMNI. Open Select Tester Valve.

OR

b. Bullhead kill well directly back to the formation.

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Again, would like to hear feedback from actual operational experience with a bullhead kill.

Respectfully
C. Bradley Pate
Drilling Superintendent, ENI do Brasil