UNDERSTAND MORE WELL CONTRL IN DRILLING................ Q1) IF we found that leak off test is not ok, then whats next step Ans 1) If Leak Off Test is not ok, this means cementing is not proper at casing shoe. You will have to go for cement repair. This can be done by cement squeez/plug job. Q2) IF we are running two mud pump at same spm, but spm of one mud pump is not remaining stable at same spm, what can be the reason? Ans 2) A very good question. Fluctuation or instability in pump SPM can tell you a lot about pump condition. Timely detection and fitting corrective action can save you rig time and money. Now coming to your question (actually I should dedicate a complete post for this, anyways in short)’unstable pump SPM’, fluctuations of pump SPM can be of two types. First, rapid fluctuations and second, slow and gradual fluctuations. Rapid Fluctuations: These are mainly due to mechanical problems which can be, worn out valve ring, valve, valve seat, piston ring and in worst case worn out wear plate and liner. You should stop the pump immediately and make a check for the things as mentioned in order. And if there are any indications of pump taking air then you should check the mud strainer in suction line. Gradual Fluctuations: These are mainly due to electrical and downhole problems. There may be problem in SCR, Motor Field or you are running near the load limit. Downhole problem like improper hole cleaning can also cause the SPM or pressure fluctuations. For electrical problems check the concerned electrical devices and for hole cleaning problem pump a lo-hi pill (low viscous mud followed by high viscous mud) and resume drilling after surface to bit time.
Posted on: Fri, 18 Oct 2013 18:43:18 +0000
Trending Topics
Recently Viewed Topics
© 2015