1, what is the drill?
Answer: the drill well buckle is inverted, thread tripping and slipping, bad drill off buckle, stab and body broken, are called drill.
What are the 65 reasons, drilling was open?
Answer: (1) the drill, threads are not tightened.
(2), illegal operation, using reverse reverse buckle.
(3), the complex situation suddenly appeared underground, no reverse stop control turntable, will drill down on.
(4) the drill, screw serious wear, downhole drilling torque, rotary drill was open when stopped.
2, screw drill not tightened, why will be poured in drilling process?
Answer: in the process of drilling, borehole along the spiral axis. In the drilling process, drilling shaft lining and spiral along the side close to the borehole in clockwise, then there is a counter clockwise friction on the tool, the formation of anti torque. In the case of loose buckle, drill is easy to open.
3, why the provisions are not allowed to buckle under or by reverse connection?
Answer: because we used to drill the wellsite are used on the reverse buckle, buckle when drill well in the reverse, so it's easy to buckle down on the loose.
4, why are not allowed to wear thread into the wells drilling more than the standard?
Answer: because the thread wear exceeds the standard, reduce the connection strength between threads. In the hole to mention the decentralization process, because of low strength and easy trip; at the same time as the thread wear exceeds the standard, reducing the sealing performance between threads, drilling fluid to stab off thread.
5, wellhead connection is not closely linked to what harm?
Answer: (1), is not closely linked, in the decentralization process is easy to buckle down to open or cause drill.
(2), wellhead connection when the drill is not closely linked, because of uneven stress, drilling wear, male buckle easily broken; high pump pressure will stab the bad after tripping caused by drill, drill falling accident.
(3), when drilling through the drill bit, the torque to the torque, and then in the transfer process, will catch the drill rod thread buckle, easy to drill a female joint swell, causing drill down the well.
6, why some drill will be drilling fluid after piercing is broken?
Answer: some pipe is arranged in the body. The inner wall of drilling fluid by trachoma, due to abrasion and erosion, wear the external pipe wall thinning; there will be trachoma thorn wear. Because after the stab strength is low, produce stress concentration points, so it is broken.
7, why old drill pipe often occurs body broken?
Answer: (1), the long-term use of drill pipe fatigue failure can reduce the intensity of.
(2), the old drill pipe body wear, reduce the strength of thin wall. In the underground by shear stress, easily breaking accident.
8.Why should the drill, regular inspection?
Answer: drill in the use of the process will occur fatigue damage, crack. The naked eye is not easy to find, with the method of NDT can be found, not to drill the fatigue damage into the well, so as to avoid the accidents of drilling tools.
9, why do you wear on drilling rig supporting wire?
Answer: on the floor under the drill wear serious wear of screw drilling tools, even damaged. If not timely, drill into the well after the easy thorn buckle, buttons and release, which will drill down the well. At the same time. After the damage will increase the cost of repairs, but also shorten the drilling cycle. So good to wear protective drilling wire under the floor.
10.Why should the hole with thread of oil?
Answer: oil lubrication and sealing screw thread of the auxiliary function, can prevent the occurrence of drilling tool sticking buckle.
11, how to determine the drill broken?
Answer: (1) the drill, finger weight table hanging weight decreased, torque decreases, serious drill bit bouncing.
(2), the pump pressure drop, slow drilling speed, no drilling.
(3), filed after the decentralization, party not in the original position; if the original position, the pump pressure to rise slightly lifted up.
12, in the drilling process, drilling tool thread was open, how to deal with?
Answer: (1) check, drilling drill, determine the nature of the fish, check.
(2), under the buckle and tighten, lifting drill string and pump, to observe the change of pump pressure.
(3) counterparts, after the success of judgment according to the change of tool weight is completely pulled. If the restoration of the original hanging heavy card drill, if the card is required for processing the oil bubble or releasing agent.
13. the drill has been broken, because the weight indicator and pump pressure table problems, how to deal with?
Answer: correction refers to the sensitivity and reliability of heavy gauge and pump pressure table recovery first, accurate judgment. After the judgment the situation on the ground, judge the underground drill blind drilling, to avoid deterioration of the accident, identify the situation immediately after drilling inspection.
14, in the process of drilling, drill tripping what phenomenon?
Answer: the pick-up weight decreased, the pump pressure drop, no further drilling footage, and bit bouncing. At the same time, rotary torque decreases, or suddenly become faster (footage vent, drill has staggered inserted down), rotary load lighter "
15, after tripping due to bad drill buckle, weight indicator and pump pressure gauge and torque instrument is not good use to continue drilling what phenomenon?
Answer: no to drilling footage, and bit bouncing phenomenon. Drilling drilling fluid circulating short upper layers increased.
16, how to salvage broken drill body?
Answer: (1), if the fracture rules, can the corresponding size of the female cone with safety joint to salvage.
(2), the best use of the corresponding size of the overshot and safety joint plus jarsin salvage.
17, the body does not rule after fracture drill, how to deal with?
Answer: (1), if the fracture is too long, with the first introduction of concave bottom mill shoe repair on the top of the fish, and then down into the overshot and safety joint salvage.
(2), if the fracture is long, but the fracture deformation is not available, overshot the washing head in the shoe repair, salvage.
(3), with a bad head overshot staggered tube salvage extension.
18, how to prevent the drill?
Answer: (1) according to the design requirements, selection of drill steel grade and thickness.
(2) the drill, regular inspection, do not accord with requirements, are not allowed to drill into the well.
(3), must use double clamp buckle, tongs bite shackle body is strictly prohibited.
(4), prohibit the use of reverse buckle.
(5) the drill, on the floor and must wear protective wire, prevent thread grinding damage.
(6) to complete the drill, and the team, regularly switching.
(7), the use of qualified oil coated screw threaded drill, screw the oil should be.
(8), team drill should be discontinued with antirust oil.
(9) and reasonable use of the slip, the slip to the right position and height.
(10), tripping to adhere to the wrong button and switch to change the stress state of drill, drill, drill to prevent fatigue failure.
(11), careful operation, prevent braking and fierce, the phenomenon of torsional meal.
(12) the drill, when stored to leave the ground, shall not be piled up on the ground and stored to prevent deformation of cross drill.
19, what is a common tool to drill off?
Answer: (1), overshot.
(2), slip spear.
(3), male, female cone cone.
