Steps and methods for handling accidents in the hole

Once an accident occurs in the hole during construction, it is difficult to deal with it according to the type and material condition of the accident. Generally, the following methods and steps can be used:

The first step: lifting, hitting, shaking, fishing, punching, catching, sucking, sticking, smashing, topping;

(1) mention:

Under the conditions of the equipment capacity, the lift can be used with the pulley block to pull the drilled hole in the hole. This method is generally used when the drilling tool is buried, but it is necessary to pay attention to the situation of wire rope, crane, rig, drilling rig and foundation. It is best to equip with “tension gauge” to prevent personal accidents.

(2) Hit:

The impact drill is struck up or down with the shock of the hammer. This method is suitable for shallow hole or block and steel chip extrusion accidents. This method is simple and is often used. When hitting a hole in a hole with a hammer, a lifting hammer and other safety hammers can be used.

In the use of hampers to deal with accidents in the hole should pay attention: it is best not to use the lift directly tied to the hamper; when the hole wall is unstable and prone to collapse, this method should not be used, otherwise, the accident will be worsened.

(3) Earthquake:

The mechanical vibrator is attached to the upper end of the accident drilling tool and tensioned by the elevator to eliminate the accidental drilling tool from strong vibration. However, care must be taken to prevent the drill in the hole from being shocked and tripped.

(4) Fishing:

Use a male and female hammer, a card holder, etc. to pick up accidental drills that fall off or break. This is a common method of dealing with accidents.

(5) Chong:

Use a small diameter drill (or drill pipe) or casing to enter the hole, and rush out the buried and stuck objects around the accident drilling tool through the high pressure liquid flow of the mud pump . However, this method must be used in the case where the wall of the hole is stable.

(6) Grab:

Use a lower toothed grasper to handle small objects or inclinometers that fall into the hole.

(7) Suction:

Magnetic iron salvage draw small objects fall into the hole, or against positive suction hole wall drill pipe breakage accidents, with wire hammer salvage.

(8) Sticky:

Get sticky fall hole with slime, yellow wax, asphalt and other small objects or diamond or diamond bit matrix.


Lifting with a lift, hitting the hammer up and down, or driving up and down to handle the blocked accident drill with a certain amount of room for movement.

(10) Top:

It is also a common method to use a jack (screw type and hydraulic type) or a hydraulic rig to increase or decrease the oil pressure and top the accident drill. However, it should be noted that when jacking the jack, the ability of the drill pipe to withstand should be considered to prevent the top break; special attention should also be paid to the slipping out of the slip.

The second step: reverse, set, cut, hook;


Use the anti-wire drill pipe and the wire hammer to find the neutral point, and return as many accident drill pipes as possible, and then cooperate with other methods. Because "reverse" is not a separate method of dealing with accidents in the hole.

The anti-drill pipe should adopt a safety method such as a wire rope back-drilling tool and a ratchet pipe-returning device. In addition, personal accidents caused by the reversal of the elastic force during the back-drilling are prevented.


It is only used for reaming and drilling of drills that are larger than one drill. Therefore, it is only suitable for soft rock formations and shallow rock formations. When there is an accident drill pipe in the hole, it must be “reverse” and then “sleeve”. When reaming, in order to prevent the drill hole from bending, it should be guided.


Use a pipe cutter to cut and remove the accident drill. This method is used to process the drill card, and it is too tight and long. The use of "cut" is often used to deal with core tube or casing accidents.


Use special hooks, spears, etc., to guide the accidental drill head to the side, or hook the enlarged joint to raise the accident drill, or to remove the wire rope and cable into the hole.

The third step: peeling, wearing, sweeping, soaking;


Use a less than 1-2 (preferably 2) drills for the accident drills that are used in the original drilling. First pass through the center of the accident drill, and use the vibration, rotation, and collision to reduce or eliminate the outside of the accident drill. The resistance to being squeezed is then treated by "fishing". When the core pipe joint, the core pipe and the powder take-up pipe are left at the bottom of the hole, they are treated by "peeling" or the like before the "wearing" method is adopted.


Use a grinding iron drill bit with the diameter of the original accident drill to peel off the core tube or the powder tube joint and the outer side of the powder take-up tube until the thread is removed, and then take out the joint.


Use a special plane drill to pry or sweep the large diameter drill or drill bit in the residual hole and remove it. When sweeping or smashing, pay attention to the clip drill and the multi-head split.


The diesel oil, alkaline water or hydrochloric acid is injected into the hole, and the immersion is buried or the mud is adsorbed and stuck, so that the accident drilling tool and the hole wall are slack, which is convenient for treatment.

The fourth step: winding, frying.

Wrap around:

Drill with an eccentric wedge to bypass the accident drill. When using this method, it must be designed by address.


The explosive is placed in a special blasting Cylinder, and is thrown into the predetermined hole depth from the drilling tool to explode, and the drill pipe is taken out after being blown off, or used to process the casing to be jammed to shock or punch the casing.

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