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Seafloor sediment coring device applicable to seafloor drilling machine

A seabed sediment and coring device technology, which is applied in the direction of extraction of undisturbed cores, earthwork drilling, etc., can solve the problems of low coring rate, influence on integrity, damage, etc., and achieves high coring rate, simple and reliable structure. high sex effect

Inactive Publication Date: 2016-01-13
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the seabed resources are mainly soft sediment substrates, the coring method / technology of the existing seabed drilling rig is directly used to perform coring operations on the seabed sediments, because the seawater in the closed cavity in the core drilling tool cannot be discharged in time, making It becomes very difficult for sediment to enter the core drilling tool, resulting in a very low coring rate. At the same time, affected by the water pressure of the closed cavity in the core drilling tool, the sediment samples obtained are often greatly disturbed or even destroyed. This will seriously affect the integrity of sediment samples for the record of seabed resources in different strata

Method used

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  • Seafloor sediment coring device applicable to seafloor drilling machine
  • Seafloor sediment coring device applicable to seafloor drilling machine
  • Seafloor sediment coring device applicable to seafloor drilling machine

Examples

Experimental program
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Effect test

Embodiment 2

[0017] Such as figure 2 As shown, the structure is similar to that of Embodiment 1, except that the water supply pipe 11 is not directly connected to the suction piston cylinder 1 , but is connected to the suction piston cylinder 1 through a switching valve 17 . The other port of the transfer switch valve 17 is connected with the flushing water pump 16 of the subsea drilling rig. The function of the transfer switch valve 17 is to switch the connection between the water supply pipe 11 and the suction piston cylinder 1 and the flushing water pump 16. When the water supply pipe 11 passes through the transfer switch valve When 17 is connected with the suction piston cylinder 1, realize that sediment is pressed into the suction coring; when the water supply pipe 11 is connected with the flushing water pump 16 through the changeover switch valve 17, realize the common positive circulation flushing, rotary drilling and coring.

Embodiment 3

[0019] Such as image 3 As shown, the structure is similar to that of Embodiment 2, the difference is that the suction piston cylinder 1 can be replaced by a water pump 18, when the drilling power head 13 pushes the core drilling tool 15 to press into the sediment for coring operation , Utilize the water pump 18 to draw water from the drill pipe 14 and the core drilling tool 15 through the water supply pipe 11 . In order to minimize the disturbance to the coring sample, the size of the water pump 18 should be reasonably selected, and at the same time, the start-stop time and the pumping volume of the water pump 18 should be reasonably controlled, so that the water volume drawn by the water pump 18 from the inner cavity of the drill pipe 14 and the core drilling tool 15 is the same as the The amount of sediment entering the core drilling tool 15 and draining into the inner cavity of the drill pipe 14 is substantially equal.

Embodiment 4

[0021] Such as Figure 4 As shown, the structure is similar to that of Embodiment 1, except that the core drilling tool 15 is an advanced double-tube drilling tool, and the core tube assembly 21 commonly used by existing seabed drilling rigs is suspended in the core drilling tool 15 and Extend the center hole of the core drilling tool 15 for a certain distance, and one or more seal grooves 19 are provided in the center hole of the drill bit of the core drill tool 15, and a seal ring 20 is placed in the seal groove, and the core tube assembly 21 is provided with a sealing ring 20. The sealing ring 20 is used to seal between the pipe and the core drilling tool 15 .

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Abstract

The invention discloses a seafloor sediment coring device applicable to a seafloor drilling machine. The seafloor sediment coring device applicable to the seafloor drilling machine is characterized in that on the basis of the existing seafloor drilling machine, a suction piston cylinder is additionally arranged, is fixedly mounted in an existing seafloor drilling machine and comprises a suction cylinder barrel, a suction piston and piston rod subassembly and a piston end cap; the suction piston and piston rod assembly is inserted in the suction cylinder barrel; the suction piston and the inner wall of the suction cylinder barrel are sealed through a sealing ring; one end of the suction piston rod is fixedly connected with the suction piston; the other end of the suction piston rod is connected with a drilling power head or a propelling mechanism of the existing seafloor drilling machine; the suction piston is driven by the drilling power head and the propelling mechanism of the existing seafloor drilling machine in a combination mode; and through reasonable selection of the inner diameter of the suction piston cylinder, the amount of water which is extracted by the suction piston cylinder from an inner cavity of a drill pipe via a water supply tube of the drilling power head is basically equal to the amount of water which is drained to the inner cavity of the drill pipe as sediments enter the coring drilling machine, piston type negative-pressure suction coring is realized, the sediment coring rate of the seafloor drilling machine is thus improved greatly, and disturbance on sediment samples is reduced.

Description

technical field [0001] The invention relates to a sediment coring device, in particular to a seabed sediment coring device suitable for a seabed drilling machine. Background technique [0002] With the development and utilization of deep seabed resources, it has become a newly developed technical field in the future resource strategies of countries all over the world. Before the large-scale development / exploitation of seabed resources, it is necessary and necessary to carry out exploration and sampling of the area to be developed / mined on the seabed to obtain information on the distribution, quality, burial depth, etc. of the seabed resources in this area. When the seabed resources are mainly soft sediment substrates, the coring method / technology of the existing seabed drilling rig is directly used to perform coring operations on the seabed sediments, because the seawater in the closed cavity in the core drilling tool cannot be discharged in time, making It becomes very dif...

Claims

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Application Information

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IPC IPC(8): E21B25/00E21B25/18
Inventor 万步炎金永平黄筱军
Owner HUNAN UNIV OF SCI & TECH
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