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Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit

A technology of horizontal directional drilling and reverse circulation, applied in directional drilling, drilling equipment and methods, drill bits, etc., can solve problems such as the crossing construction of large-diameter horizontal directional drilling pipelines, so as to reduce the cost of equipment entry and exit, and reduce the amount of use. , the effect of reducing pollution

Inactive Publication Date: 2011-04-06
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By adopting the process method and the drill bit of the present invention, many problems that currently plague the crossing construction of large-diameter horizontal directional drilling pipelines will be easily solved

Method used

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  • Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit
  • Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit
  • Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment the utility model is further described.

[0030] Such as figure 1 , figure 2 As shown, the horizontal directional drilling pipe crossing reverse circulation drilling method provided by the present invention is based on the traditional drilling mud circulation, by changing the supporting equipment and adopting a new structure of the drill bit, the mud in the drilling process is realized according to the mud pool→drilling ring In this process, the drill pipe 3 of the drilling rig 2 enters the drilling annular space 9 through the entry pit 4, and the drilling annular space 9 The other end is an unearthed pit 8, and the drill pipe 3 of the drilling rig 2 is provided with a centralizer 6, and the drill pipe 3 is connected with the reaming bit 7 through the drill pipe joint, and both the inside of the drill pipe and the reaming bit are hollow cavities. The drill bit 7 is provided with a slag suction port 13 comm...

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Abstract

The invention provides a traversing reverse circulating drilling method of a horizontal directional drilling pipeline and a special drilling bit, which are suitable for laying oil-gas pipelines and municipal pipelines. The drilling method comprises the following steps of: mounting a gravel pump at the outer end of a drilling machine or a pit, wherein hollow cavities are formed in the drilling bit and the drilling stem in use; arranging a slag suction port communicated with a borehole circular space on a reaming drilling bit; sleeving a roller cone seat with a roller cone outside the body of the reaming drilling bit, wherein the position of the roller cone corresponds to that of the slag suction port; arranging a plug for blockage at one end of the reaming drilling bit; and circularly flowing slurry according to a flowing direction from a slurry pond to the borehole circular space, the reaming drilling bit, the drilling stem, the gravel pump and the slurry pond during drilling so as to reach the aim of deslagging. The method and the drilling bit of the invention can be adopted to effectively remove drilling slag and gravel in the horizontal borehole and solve various problems in the traversing construction of the large-diameter horizontal directional drilling pipeline.

Description

Technical field [0001] The invention relates to a horizontal directional drilling pipeline crossing reverse circulation drilling method and a special drill bit. The horizontal directional drilling pipeline crossing reverse circulation drilling method is particularly suitable for laying oil and gas or municipal pipelines and belongs to the field of non-excavation engineering. Background technique [0002] At present, in the construction of pipelines laid by horizontal directional drilling, the length and diameter of construction pipelines are getting larger and larger. As the length of the pipeline and the diameter of the borehole increase, the cuttings generated during the reaming process also doubles, and the particle size of the cuttings generated during the drilling of the rock formation is larger, so it is more difficult to remove the slag when drilling into the rock formation . Especially for large-diameter, long-distance crossing projects like the Second West-East Gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/04E21B10/26E21B21/00F16L1/028
Inventor 马保松韦立勇兰海涛曾聪舒彪
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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