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Composite drill bit for submarine natural gas hydrate layer

A hydrate and layer composite technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of sticking, formation of mud bags, and difficulty in inhaling hydrate recovery channels, so as to prevent sticking and improve rock breaking efficiency. Effect

Active Publication Date: 2018-10-19
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

In addition, using the existing drill bit to break the hydrate rock formation will produce large-diameter hydrate sediment cemented particles, which are not easy to be sucked into the hydrate recovery channel, reduce the discharge speed of the hydrate mud slurry, and even form mud bags, resulting in serious problems such as drill sticking. as a result of

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  • Composite drill bit for submarine natural gas hydrate layer
  • Composite drill bit for submarine natural gas hydrate layer
  • Composite drill bit for submarine natural gas hydrate layer

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Embodiment Construction

[0031] Such as Figure 1~3As shown, the present invention relates to a composite drill bit for a subsea natural gas hydrate layer. Its main structure is divided into three layers. The first layer is a collar hole drill body. Connecting, the drill body 10 of the collar hole drill body is cylindrical, and its cutting part includes a pyramid-shaped scraping edge 22 integrated with the drill body and a cylindrical drill tooth 11 inlaid at the bottom of the structure. There are tapered flow channel 13, diffuser cavity 14, drilling fluid injection hole one 12, and drilling fluid injection hole two 9 inside the drill bit. The tapered flow channel 13 extends from the top to the top of the diffuser cavity 14. The pressure chamber 14 is cylindrical and is located inside the drill body 10 of the collar bit body. The first drilling fluid injection hole 12 and the second injection hole 9 are respectively located at the bottom and side of the diffuser chamber 14 . The second layer is the r...

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Abstract

The invention discloses a composite drill bit for a submarine natural gas hydrate layer. The composite drill bit is mainly divided into three layers, wherein the first layer is a lead hole drill bit body for drilling a lead hole and is provided with a drilling fluid jet hole for cleaning the bottom of a well and assisting debris removal; the second layer is a hole expanding drill bit body for further expanding a wellbore and is provided with a spiral groove for facilitating discharge of rock debris; the third layer is a secondary crushing mechanism for refining large-diameter particles of hydrate sediments; meanwhile, a tapered flow passage for increasing a flow rate of the drilling fluid and a diffuser cavity for exciting the jet pressure are arranged in the drill bit body. The compositedrill bit provided by the invention is suitable for a fluidized mining process of submarine shallow natural gas hydrates, and is more in line with physical characteristics of a hydrate layer, therebyeffectively improving the crushing efficiency of a hydrate rock formation, realizing refinement of the large-diameter particles of the hydrate sediments, and solving problems of rock debris deposition, balling formation and drill tool sticking during long-distance horizontal drilling.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a composite drill bit for a subsea natural gas hydrate layer. Background technique [0002] Natural gas hydrate, also known as "combustible ice", is a "cage compound" formed by methane-based hydrocarbon gas and water under certain temperature and pressure conditions. It is a white solid substance with a density close to and slightly lower than that of Due to the density of ice, the discovered natural gas hydrates mainly exist in the permafrost areas in the Arctic region and in the seabed, continental slope, land base and trenches around the world. The types of storage layers mainly include sandstone, sandstone fracture, Fine-grained fracture type and dispersed type, and it usually exists in the seabed at a water depth of 300~3000m. Natural gas hydrates exist widely in the world. According to the evaluation results of relevant scientists, the distribution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/00E21B10/42E21B10/26E21B10/43E21B10/60
CPCE21B10/00E21B10/26E21B10/42E21B10/43E21B10/60
Inventor 唐洋姚佳鑫王国荣周守为刘清友钟林李清平付强何玉发王川
Owner SOUTHWEST PETROLEUM UNIV
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