05 Drillers Method
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The document describes the drillers method for killing a gas well influx. It involves making multiple circulations of the well while carefully monitoring and controlling drillpipe and casing pressures to maintain bottomhole pressure and circulate the gas out of the well. The first circulation involves increasing drillpipe pressure as casing pressure rises to expand the gas bubble. The second circulation then displaces the drillstring with kill-weight mud while holding casing pressure constant to displace the gas from the annulus. After confirming no remaining gas influx, the well is shut in.
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05 Drillers Method
- 1. CLOSE OPEN 300 500 Well is shut in and pressures allowed to stabilize. Shut-in Drillpipe pressure + Hydrostatic = Bottom Hole Pressure. Kill the well using the Drillers Method. Mud weight = 10ppg TVD = 10,000 ft. DP CP BHP 300 500 10,000 X 10 X .052 = 5,200 psi 5,200 + 300 = 5,500 psi Drillers Method – first circulation 500 CLOSE OPEN 1300 DP CP BHP 1300 500 5,500 KRP @40 spm = 1,000psi ICP = 1000 + 300 = 1,300 psi on DP Casing Pressure is held constant as pumps are brought up to speed by opening the choke. If the Casing Pressure is held constant when starting then BHP is held constant. Once pumps are up to speed the Drillpipe Pressure should be held constant to keep BHP constant. Drillers Method – first circulation CLOSE OPEN 1300 DP CP BHP 1300 520 5,500 Till the gas influx gets farther up the hole there is little expansion and the Casing pressure will rise slowly as mud (hydrostatic) is pushed out of the hole. 520 Drillers Method – first circulation
- 2. CLOSE OPEN 1300 DP CP BHP 1300 650 5,500 650 As the bubble begins to expand it pushes mud out of the hole causing a loss of hydrostatic. To keep BHP constant, Drillpipe pressure must be kept constant. Drillers Method – first circulation CLOSE OPEN 1300 DP CP BHP 1300 800 5,500 800 Drillers Method – first circulation CLOSE OPEN 1300 DP CP BHP 1300 1000 5,500 1000 Drillers Method – first circulation
- 3. DP CP BHP 1300 1100 5,500 CLOSE OPEN 1300 1100 Drillers Method – first circulation 1300 1250 DP CP BHP 1300 1250 5,500 CLOSE OPEN Drillers Method – first circulation 1300 1400 DP CP BHP 1300 1400 5,500 CLOSE OPEN Drillers Method – first circulation
- 4. 1300 1600 DP CP BHP 1300 1600 5,500 CLOSE OPEN Drillers Method – first circulation 1300 1750 DP CP BHP 1300 1750 5,500 CLOSE OPEN Drillers Method – first circulation 1300 1000 DP CP BHP 1300 1000 5,500 CLOSE OPEN Drillers Method – first circulation
- 5. 1300 400 DP CP BHP 1300 400 5,500 CLOSE OPEN Drillers Method – first circulation 300 300 DP CP BHP 300 300 5,500 CLOSE OPEN Once the influx is circulated out, the well should be shut-in. Compare the Drillpipe and Casing pressure gauges and confirm that they are equal. If Casing pressure is greater than Drillpipe pressure then you may not have all the influx out of the well. Once you are confident that the annulus is clean line up the pumps on Kill Weight Fluid. Drillers Method – half way home 300 DP CP BHP 1300 300 5,500 CLOSE OPEN 1300 Hold Casing pressure constant as you bring the pumps up to 40 spm. Continue to hold Casing pressure constant as you displace the drillstring. Drillpipe pressure should drop as hydrostatic in the drillpipe increases. KRP @40 spm = 1,000psi ICP = 1000 + 300 = 1,300 psi on DP Drillers Method – second circulation
- 6. 300 DP CP BHP 1250 300 5,500 CLOSE OPEN 1250 Drillers Method – second circulation 300 DP CP BHP 1200 300 5,500 CLOSE OPEN 1200 Drillers Method – second circulation 300 DP CP BHP 1150 300 5,500 CLOSE OPEN 1150 Drillers Method – second circulation
- 7. 300 DP CP BHP 1100 300 5,500 CLOSE OPEN 1100 Drillers Method – second circulation 300 DP CP BHP 1060 300 5,500 CLOSE OPEN 1060 Once the Drillpipe is full of Kill Weight Fluid the hydrostatic will remain constant. Continue circulating holding Drillpipe pressure constant at FCP. Casing pressure should drop as Kill Weight Fluid displaces the annulus. Drillers Method – second circulation 300 DP CP BHP 300 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation
- 8. 250 DP CP BHP 250 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation 200 DP CP BHP 200 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation 150 DP CP BHP 150 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation
- 9. 100 DP CP BHP 100 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation 50 DP CP BHP 50 5,500 CLOSE OPEN 1060 1060 Drillers Method – second circulation 0 DP CP BHP 0 0 5,500 CLOSE OPEN 0 After confirming that Kill Weight Fluid is back to surface, shut the well in. Drillpipe and Casing pressure should read 0 psi. Open the choke and check for flow. When opening the Annular beware of gas trapped under the element. Drillers Method – END