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The omen and preventive measures of Blowout

2013-01-11

Blowout omen

1 The quantity of mud which return to wellhead is increscent, circulation tank liquid level is rise.

2 Mud pump pressure rise, and then decline.

3 Drill tool hanging load down, then up again.

4 The proportion of drilling fluid drop, temperature rise, has bubble phenomenon.

5 If oil bubble contains hydrogen sulfide and overflow, drilling fluid color will darken, still can smell the smelly egg taste.

6 Stop circulate, wellhead still have mud overflow.

 

Preventive measures of blowout

1 Have reasonable well structure.

2 Have reliable well control device.

3 Use drilling fluid with suitable proportion.

4 When drilling to oil and gas layer above 50~100m, we had better do a open hole pressure test.

5 After opening the oil and gas layer, the speed of pull out drill pipe can’t be too fast.

6 After opening the oil and gas layer, can't reduce the fluid column pressure at any time.

7 The time of stop circulate should be short, must be run in hole immediately after pull out drill pipe.

8 Reserve the weighting materials.

9 After opening the oil and gas layer, use fire is not allowed in well site.