Bit selction

Hello Every body;
I'm working on a bit selection program for a 16" hole. The problem we are facing is the lithology as it consists of an alternation of soft and hard formation. Besides, there is a high tool vibration; therefore, we couldn't reach the TD of 16" section. Many cutters are damaged.
I don't know if any of this forum members has faced that problem before. I'm looking forward hearing from you any suggestions, solutions or documentation.

Many thanks
Boumezrag

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Broken Cutters.4.JPG, 302 KB

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Permalink Reply by Kim Bufton on May 18, 2010 at 8:04pm

You don't give enough info here to formulate and effective bit strategy, however it would appear that you should be using a tri-cone (could be inset or mill tooth, need more info to decide) on a motor. The motor will lessen vibration by discoupling the bit from the assembly, if the vibration is bit driven. However, vibration can also be formation / stabilisation driven and may need a review of the BHA configuration. As I said, not enough info to form an opinion. Who do you work for, if your an engineer with a oil company then they should have enough contacts in the business to sort this out. If you don’t then you should start talking to someone like Baker (bits, and drilling / evaluation departments) as they have extensive experience with this sort of this, as does Schlum and and Halliburton (though they will charge you an arm and a leg as well as requiring your first born as a down payment).

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Permalink Reply by Joe lilley on May 18, 2010 at 8:34pm

Insert bit(button bit)

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Permalink Reply by Mohamed Boumezrag on May 19, 2010 at 8:01am

Not suitable due to formation

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Permalink Reply by DeeperCheaper on May 18, 2010 at 10:34pm

Ever heard of a shock sub? And a slow rotary......????

Deeper

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Permalink Reply by Justun Huston on May 18, 2010 at 11:53pm

There is a new "hybrid" bit out there that is still in the testing phase. It is kind of a cross between a PDC and a TriCone. I think it has five or so blades like a PDC and then three cones that are not touching. It's a pretty amazing bit. Seems to be what you might be looking for. I don't have much info on it now but I'll probably have more in a few days. I've seen it come out of the hole after 120 hours looking brand new. That's after hard formations and sometimes some rediculous torque.

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Permalink Reply by Mohamed Boumezrag on May 19, 2010 at 8:05am

That's really new for me. I'll look it up. I really appreciate that from you.

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Permalink Reply by Mohamed Boumezrag on May 19, 2010 at 7:48am

Thank you very much for your answer that is very nice of you. I'm in touch with Reedhycalog and Smish Bit departements trying to solve the problem.

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Bit selction

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