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Have you ever used these drill pipe and drill bit fishing methods?
Release time:
2022-04-07
Author:
Source:
In the process of large-diameter pile foundation construction of rotary excavators, accidents of hole collapse and burying and holding occur from time to time, but the causes, accident conditions and site conditions of rotary excavators are not the same, so the measures taken are not the same, and sometimes several treatment methods may need to be used. The editor focuses on the treatment method of buried drilling, and describes the processing tools in detail, hoping to communicate with peers. After the burying or holding accident, the mud performance shall be adjusted in time to control the further expansion of the accident, and the causes shall be analyzed in time to take corresponding measures, so as not to miss the best treatment time. The treatment of buried drilling can be summarized as "cleaning, penetrating, topping, frying, expanding,
In the process of large-diameter pile foundation construction of rotary excavators, accidents of hole collapse and burying and holding occur from time to time, but the causes, accident conditions and site conditions of rotary excavators are not the same, so the measures taken are not the same, and sometimes several treatment methods may need to be used. The editor focuses on the treatment method of buried drilling, and describes the processing tools in detail, hoping to communicate with peers.
After the burying or holding accident, the mud performance shall be adjusted in time to control the further expansion of the accident, and the causes shall be analyzed in time to take corresponding measures, so as not to miss the best treatment time. The treatment of buried drill can be summarized into methods and steps such as "cleaning, penetrating, topping, blasting, expanding, fishing, smashing and digging.
Treatment of 1. sediment
"Qing" means cleaning slag and washing holes. Slag cleaning can be carried out by positive and negative circulation, high injection or well flushing pipe air compressor. Slag cleaning should be carried out according to the formation to determine the mud quality and hole cleaning equipment used to avoid the occurrence of secondary hole collapse accidents during fishing and drilling. Use air compressor to wash holes.
Salvage of 2. Drill Pipe Bits
(1) In some cases, the key to deal with the buried drilling accident is to dredge the channel between the bottom of the hole and the upper part of the drill bit, so that the bottom of the drill bit and the upper part form a connector to avoid the piston effect, which is "through". In order to form a communicating device, several holes deeper than the accident hole are usually punched at the hole edge, and high-pressure rotary spray is used for swing spraying. For passage formation, rotating the power head while increasing the main rope lifting force, it is possible to lift the drill pipe and drill bit together. Some treatment schemes use the combination of reverse circulation drilling rig and reaming bit.
(2) "top" is to use jack to top the drill pipe, which is a common force method to deal with buried drilling. The use of jacks requires a solid platform, and the drill pipe is welded with a jack force plate. The 3cm rib plate is welded to the drill pipe, the top plate is welded to the rib plate and the drill pipe, and the 2 top plates are connected. The I-beam adopts 60x 100cm specification and is connected with a connecting plate. The jack control system shall be linked and pressurized. Generally, the clamping ring or direct selling connected to the upper part of the drill pipe can bear a limit load of about 180kN. After the jack is linked and pressurized to 150kN, the pressure should be gradually increased, and the pressure should be stagnated for about 1h after each increase of 3 to 5kN, waiting for the soil layer creep effect to play. Rotate the power head while pressurizing. There may be several results of using jacks: first, the drill pipe of the drill bit is completely pushed out; Second, the top cover or bucket door of the drill bit is damaged, and the drill pipe together with the damaged drill bit is pushed out. Third, the inner rod snap ring or direct pin of the drill rod is broken, and the inner rod and drill bit remain in the hole. Fourth, the drill pipe broke from the old crack, and some drill pipes and drill bits remained in the hole.
(3) "Blasting" means blasting at the bottom of the hole. If the hole cannot be lifted after washing, the drill bit can be damaged by explosive positioning blasting and the drill pipe can be raised. Generally, the pile holes used to deal with accidents by this method are close to the design depth, which can meet the requirements of bearing capacity after design verification, and can be directly poured after blasting.
(4) "expansion" means using a reaming bit about 10cm larger than the bit to ream the hole below the bit bucket door, and then fishing for the drill pipe bit. The reaming bit can be modified by using a casing with a diameter 10cm smaller than the original casing.
(5) The force method of "sleeve, clamp and hook" can be used for fishing the drill bit or drill pipe of the rotary excavator. If the inner part of the drill pipe is broken, the drill pipe and the drill bucket are left in the hole. After reaming and washing the hole to remove the slag, the diver can lower the drill pipe and the drill tool. When the buried depth is shallow, the steel bar support can also be used to take out the drill pipe. For example, when the buried depth is deep, the hole reaming and sediment cleaning can be used for fishing. When the sediment is thick, the trap can also be made. The lifter is fixed on the three-section drill pipe with self-made steel pins, and the pot bottom-shaped fishing device is also fixed on the same section of drill pipe. The height of the straight wall of the salvage device shall be greater than the height of the head of the drill bit force to ensure that the wire rope welded therein can remove slag in place. The wire rope sling can be fixed on the power head during slag removal to ensure that the rope sling is synchronized with the drill pipe.
When the ordinary drill bit is shallow, the force of the lower hook can also be tested. Using welded rigid rods, the drill bit can be directly drilled to hook the beam of the buried drill bucket and put forward the drill bit.
(6) Some after-frying depth cannot meet the requirements or the drill bit is broken in the hole. The damaged drill bit can be smashed by the impact drill to drill into the final hole.
(7) In some areas, the water level is deep and the buried depth of the drill pipe is shallow, so the buried drill can be handled by the method of excavation under man. The size of the manual hole should be greater than the hole diameter of about 20cm, and finally Luoyang shovel can be used to hollow out the circumference of the drill bit, so that the drill bit can be dug out smoothly.
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Key words:
Method, drill pipe, drill bit, handling, accident, available, reaming, salvage, conduct
