Bit accident
1, what is a bit accident?
Answer: includes a bit accident, which occurred in the process of drilling bit: mabozi, cone off, broken teeth, tooth and claw - cone; broken blade, blade drill - joint; PDC bit off or polycrystalline diamond and natural diamond shedding, called bit accident.
2, drilling cone bit, which causes the Fall cone?
Answer: (1), bit quality problems, such as the cone assembly does not correspond with requirements, cone body welding is not strong.
(2), before the beginning of drilling activities caused by cone, card cone, drilling well worn out after partial.
(3), the pressure will fall cone shell after fracturing wells.
(4), over time using bearing wear after falling rock.
(5), occurred in the drilling drilling, drilling, slip the cone stuck partial wear after falling wells after fracturing.
(6), due to the performance of drilling fluid is not good, bit balling, causing cone stuck.
(7), in the process of drilling hard pressure resistance, caused by local damage cone.
3, how to prevent the cone off accident?
Answer: (1) selection, quality in line with the requirements of the roller bit.
(2), must start drilling activities cone, general light slow turn pressure roller running in 30~45 minutes.
(3), the operator should concentrate, uniform drilling drilling, drilling, slip to prevent bit balling.
(4), weight indicator and other types of drilling instruments should be flexible and easy to use, have to stop drilling renovation.
(5), in accordance with the bit instructions correctly using drill factory.
(6), no time to use, if there is a bit late, bad jump and torque increase phenomenon to make timely judgments, timely change the drilling bit.
4, in the process of drilling in its reasons for broken blade?
Answer: (1), blade bit quality problems, such as, blade bonding, welding and burning quality problems caused by.
(2), uneven drilling drilling hard formation of sandwich, the blades will be limp off.
(3), drilling pressure is too large to eat deep into the formation of the blade - off.
(4), due to operational errors caused by drilling, drilling and other slip.
5, how to prevent the broken blade accident?
Answer: (1), select qualified blade bit, and through inspection, inspection, the blade should be at the same level, height 2~3 mm.
(2) operator, careful operation, uniform drilling, drilling accidents happen to prevent slip.
(3) according to the design, construction, according to the BHA and formation depth of well, according to the requirements of pressure.
6, how to deal with rock falling accident?
Answer: (1), under the strong magnetic die salvage.
(2) and cone Fisher fishing.
(3), the reverse circulation salvage salvage blue.
(4), wear shoes will wear off roller.
