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Steel Tooth Tricone Bit
1.We will track to each customer to get the feedback of product quality and service.And we will make a chance according to the feedback.If the product size is mistaken,we will send the right ones freely.
2.We ensure the high quality.Please feel free to contact me if you found any damages.We will solve the problems as soon as possible.
3.We can provide product repair services.
Drill Bit Application Instructions
1 bit selection
- 1. Please reading lithology description and bit records of adjacent wells carefully,and analyzing formation characteristics.
- 2. Selecting appropriate type in accordance with lithology.
2 Preparation before drilling
1.Inspect previous bit for body damage, lost cutters or inserts etc. Make sure there are no any junk on bottom hole, and clean the bottom hole if necessary.
2.Bit must be handled with care in order not no damage cutters and hard substances.
3.Check if there is any damage on bit cutters and if there any foreign matter inside the bit.
4.Check if installing nozzle is meet requirements, and replace nozzles if necessary.
3 Marking up the bit
1.Clean bit threads and apply grease on threads.
2.Fit the breaker to the bit, lower the drill string onto the pin and engage the threads.
3.Locate the bit and breaker in the rotary bushing, and make-up the bit to be recommended torque.
4 Tripping in
1.Remove the breaker and carefully lower the bit through the wellhead device in order not to damage it.
2.Shrinkage,shoulder,dogleg and key seat of borehole should be cautious when bit through blank hole.
3.Start pump and cycle drilling fluid to wash buttom hole when drill to a point about 30 meters to bottom of the hole, and rotate drill string at the low speed not more than 60rpm.
4.Approach the bottom approximately half meter. Circulate for 5 to 10 minutes with full flow.
1.Reaming long sections of under gauge hole is not recommended.
2.If reaming operation is necessary, it is strongly recommended that the reaming operation should be done with maximum flow rate circulation,specific weight on bit not exceed 90N/mm (diameter),rotary speed not exceed 60 rpm where stuck was encountered when tripping in.
6 Bit break-in
1.Overusing display instruments when bit approach bottom hole. If the WOB and torque increase,that shows bit have arrived at bottom hole.Use not more than 90N/mm,weight –on =bit and 40to 60rpm to establish the bottom hole pattern at least half meter.
2.Bit break-in is finished and should be adjusted RPM to obtain optimal drilling parameter combination.
3.Drilling parameters adjustment should be selected within the limits of the recommended parameters refer to recommended drilling parameters optimization method.
7 Normal drilling
1.Drilling situations should be monitored and analyzed during, so that we can judge complex condition and take corresponding measures.
2.See the table of complex circumstance in this manual for any conditions and treatment action.