Horizontal directional drilling crossing construction method and horizontal directional drilling crossing drilling device

A technology of horizontal directional drilling and horizontal directional drilling rig, which is applied in directional drilling, earthwork drilling, wellbore/well parts, etc. It can solve the problem of increasing the amount of bentonite and additives, prolonging the self-stabilization time of drilling, and being unsuitable for horizontal directional drilling, etc. problems, to achieve the effect of protecting the environment, reducing construction risks, and reducing construction costs

Active Publication Date: 2014-12-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The weak point of above-mentioned method is: 1, in reaming and dragging back stage, borehole wall is only supported by the mud of liquid state, it is difficult to keep borehole wall stable for a long time for loose formation, and graded reaming will increase Disturbance to the formation prolongs the self-stabilization time of drilling and increases the risk of crossing failure caused by hole collapse
For pebble and gravel formations, drill cuttings with large particle sizes cannot be suspended and discharged out of the borehole, so drill sticking accidents are prone to occur, and horizontal directional drilling is not suitable for direct crossing
3. When crossing strata with high rock strength (greater than 50MPa), the cutting torque of the drilling tool is large. When the diameter of the crossing pipeline is large, it will be limited by the torque of the drilling tool, which is not suitable for horizontal directional drilling.
In order to solve this contradiction, we can only improve the performance of the mud and increase the amount of bentonite and additives, thereby increasing the construction cost

Method used

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  • Horizontal directional drilling crossing construction method and horizontal directional drilling crossing drilling device

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Effect test

Embodiment 1

[0024] The strata traversed are silt and silty clay. First complete the preparatory work at the unearthed end. Lay water supply pipes, drainage pipes, grouting pipes and power supply lines in the crossing pipelines at the unearthed end; It is connected with the grouting pipe 13, and the crossing pipeline is welded with the pipe nipple 4 at the end of the drilling equipment. After the horizontal directional drilling machine completes the pilot hole operation, connect the drilling equipment at the excavation end. Use the horizontal directional drilling rig to pull the drill pipe, and use the drill pipe to pull the drilling equipment into the operation pit to start excavation. The drilling equipment cuts the formation to expand the drilling. The driving mechanism 9 (mud motor) drives the cutter head 6 to cut the formation, and the high-pressure mud required by the mud motor is provided by the horizontal directional drilling machine through the drill pipe. The mud is ejected f...

Embodiment 2

[0026] The strata traversed are silt sand, fine sand, medium sand and coarse sand. First complete the preparatory work at the unearthed end. Lay water supply pipes, drainage pipes, grouting pipes and power supply lines in the crossing pipelines at the unearthed end; It is connected with the grouting pipe 13, and the crossing pipeline is connected with the pipe nipple 4 at the end of the drilling equipment. After the horizontal directional drilling machine completes the pilot hole operation, connect the drilling equipment at the excavation end. Use the horizontal directional drilling rig to pull the drill pipe, and use the drill pipe to pull the drilling equipment into the operation pit to start excavation. The drilling equipment cuts the formation to expand the drilling. The driving mechanism 9 (mud motor) drives the cutter head 6 to cut the formation, and the high-pressure mud required by the mud motor is provided by the horizontal directional drilling machine through the ...

Embodiment 3

[0028] The strata traversed are silt sand, fine sand, medium sand and coarse sand. First complete the preparatory work at the unearthed end. Lay water supply pipes, drainage pipes, grouting pipes and power supply lines in the crossing pipelines at the unearthed end; It is connected with the grouting pipe 13, and the crossing pipeline is connected with the pipe nipple 4 at the end of the drilling equipment. After the horizontal directional drilling machine completes the pilot hole operation, connect the drilling equipment at the excavation end. Use the horizontal directional drilling rig to pull the drill pipe, and use the drill pipe to pull the drilling equipment into the operation pit to start excavation. The drilling equipment cuts the formation to expand the drilling. The drive mechanism 9 (motor) drives the cutter head 6 to cut the formation, and the motor is powered by the ground power supply device through the power supply line. The muddy water is injected by the wat...

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Abstract

The invention discloses a horizontal directional drilling crossing construction method and a horizontal directional drilling crossing drilling device, wherein the method and the device are designed for improving stability of the hole wall of the drilled hole and reducing the crossing construction risk. The front portion of the cabin wall in a drilling device body is connected with a main shaft, a conical breaking mechanism, a cutterhead and a horizontal directional drilling machine traction drill stem, and the rear portion of the cabin wall is connected with a cutterhead driving mechanism, a water supply pipe and a water discharge pipe. The rear end of the body is connected with and provided with an injected hole and internally provided with a dragging pipe short section of an injection pipe. The rear end of the dragging pipe short section is connected with a crossing pipeline. The method and the device are used for horizontal directional drilling crossing of pipelines with the diameter of 400 mm or larger, and can expand the drilled hole to the size of a finished hole at a time, and directly drag the pipeline back into the drilled hole so that pavement can be completed; meanwhile, a gap between the inner wall of the drilled hole and the crossing pipeline is filled, and drilling chips are discharged to the soil outlet end. By means of the method and the device, stability of the hole wall of the drilled hole can be improved, the construction risk caused by hole collapsing is reduced, construction cost is reduced, the environment is protected, the large-diameter and long-distance pipeline crossing under the loose stratum conditions and the hard rock stratum conditions can be achieved, and the application range of the horizontal directional drilling method is enlarged.

Description

technical field [0001] The invention relates to a horizontal directional drilling crossing construction method and drilling equipment thereof, belonging to the technical field of trenchless crossing construction. Background technique [0002] At present, the construction technology of horizontal directional drilling for crossing pipelines with a diameter of more than 400mm is divided into three stages: drilling pilot hole, reaming and dragging back. The rod is connected with the reamer, the drilling rig pulls the drill pipe, and the drill pipe drives the reamer to expand the drill hole step by step along the crossing track, with each stage reaming about 150mm until the borehole diameter reaches 1.5 times the outer diameter of the pipeline to be crossed or is larger than the pipeline The outer diameter is 300mm; finally, the drill pipe is used to connect the crossing pipeline at the unearthed end, and the crossing pipeline is dragged into the borehole to complete the pipeline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B21/12
Inventor 陆江
Owner BC P INC CHINA NAT PETROLEUM CORP
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