Drilling pressure relief type drilling tool jamming accident fishing tool and method

Abstract

The invention discloses a drilling pressure relief type drilling tool jamming accident fishing tool and method. The fishing tool comprises a cylindrical shell and a sliding sleeve. A transmission shaft penetrating through the shell is arranged in the shell, and a first boss is arranged at the outer edge of the middle of the shell. A second boss is arranged at the outer edge of the middle of the sliding sleeve, and the first boss is connected with the second boss. The top end of the transmission shaft is connected with a fishing drilling tool, and the other end of the transmission shaft is connected with a guide body. The maximum external diameter of the guide body is similar to that of the shell, one end of the guide body is connected with the transmission shaft, the other end of the guide body is connected with a fishing drill bit, and a chamfer is machined on the side, close to the fishing drill bit, of the guide body for guiding. The fishing tool is suitable for conventional drilling tool fishing, directional drilling tool fishing, coal bed drilling fishing and rock drilling fishing, and is wide in application range; the high-strength drilling tool is adopted in fishing drilling operation, and fishing capacity is high.

Description

technical field [0001] The invention relates to a fishing tool for a stuck drill accident in a near-horizontal borehole and a fishing method for an accident drill tool, which is characterized in that the drilling pressure relief type drill stuck accident fishing tool and method are used to release the pressure of the drill hole through adjacent positions. Background technique [0002] At present, near-horizontal drilling in coal mines is widely used in coal mine gas control, water damage prevention, geological exploration and other technical fields. The frequent occurrence of accidents has brought great hidden dangers to safe production and personal safety. Drill sticking accidents in underground coal mines mainly include hole wall collapse, mudstone necking, and cuttings deposition. Collapse stuck pipe is the most common. According to the different types of stuck pipe accidents, the handling methods of accidents are also different. At present, the commonly used methods for...

AI Technical Summary

Problems solved by technology

[0003] Among them, the strong fishing method is: after a stuck drill accident occurs, use the drilling rig to drive the stuck drilling tool to perform a strong forward rotation and trip out, so that the cuttings at the stuck position (stuck point) of the drill tool will be loosened to realize the solution. Although this method is simple to operate and has strong applicability, it can meet the needs of various types of stuck drill accidents; however, because this method uses strong fishing, the damage to the drilling tool is relatively large, and it is easy to cause damage to the drilling tool, leading to further accidents. Deterioration; especially when dealing with directional drilling accidents, it may cause the power device at the bottom of the hole and the measurement-while-drilling system to fall into the hole, causing huge economic losses

[0004] The casing milling salvage method is: after a stuck drill accident occurs, the casing milling salvage drill and salvage bit are used, and the rotary drilling process is used to cover the accident drill in the hole, and the blockage of the stuck drill part is opened, so as to realize the jam release; this method can It meets the needs of drill tool salvage for hole wall collapse and drill cuttings stuck accidents with good formation conditions, but it is powerless to deal with drill stuck accidents in relatively broken formations and mudstone diameter shrinkage accidents. The reason is that such complex formations are easy to This led to the occurrence of a sticking accident of the salvage drilling tool, which caused the accident to worsen; the casing milling salvage needs to be equipped with a special large through-hole salvage drilling tool, and the cost is high; and the drill pipe has the characteristics of thin wall and large through hole. Compared with the conventional drill pipe, the strength It is relatively low, not suitable for drilling tools for long drilling accidents; during the casing milling and fishing process, the drilling rig slips and even the drilling rig power head need to be replaced frequently, the auxiliary workload is large, the drilling speed of the casing milling salvage drilling machine is low, and the overall fishing efficiency is low Low

[0005] The mining and salvage method is: after a stuck drill accident occurs, the accidental drilling tool is located within the scope of the mining working face, and the accidental drilling tool is dug out in the later mining activities; this method requires that the accidental drilling tool must be located in the mining working face spatially. This leads to a narrow range of applications; for accidental drilling tools in non-excavation areas, this method has the disadvantages of high cost and low efficiency.

[0006] The reverse thread tap fishing method is: after a stuck drill accident occurs, the drilling rig is reversed first to loosen the accident drill tool from a certain place in the hole, and then the drill tool is lifted from the loose thread to the hole section, and then the reverse thread salvage tap is lowered. and anti-threaded drill pipe to salvage the drill tool falling in the hole; this method uses anti-threaded taps to cause damage to the drilling tool, and generally requires multiple salvages to complete the accident treatment, with low processing efficiency and heavy workload It also often happens that the accident drilling tool in the hole cannot be fully salvaged, which brings potential safety hazards to the mining operation

[0007] The accident handling method of forcefully unscrewing the safety handle in directional drilling is as follows: After the drill stuck accident occurs in the directional drilling, the drill rig is rotated strongly to unscrew the safety handle connected between the screw motor and the measurement system while drilling, and the hole The bottom motor and directional drill bit remain in the hole, and other drilling tools are successfully lifted out; this method is only suitable for directional drilling in coal mines. While causing economic losses, the screw motor and directional drill bit remaining in the hole will affect the subsequent mining. Occupation poses safety hazards

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