Gravity piston type long cylindrical sediment sampler penetrating through hydrate BSR interface

Abstract

The invention relates to a submarine sampling device and aims at providing a gravity piston type long cylindrical sediment sampler penetrating through a hydrate BSR interface. The sampler comprises components of a fidelity sampling barrel, a stream guidance cabin, an accumulator, a hermetic cabin, a movement weight mechanism, a hanging bracket, and the like. The fidelity barrel body of the sampling barrel consists of a plurality of stainless steel pipes with trapezoidal thread interfaces, and the stainless steel pipes are screwed and connected together through annular union joints; the bottom of the hermetic cabin is provided with a cofferdam, and both sides of the cofferdam are respectively provided with a hole for connecting with rubber hoses and being fixed on a stream guidance device; a flap valve is arranged between the hermetic cabin and the cofferdam, and the bottom of the cofferdam is provided with two semicircular ports. Based on the structural optimization and sampling caliber optimization, the sampler length and the sampling depth are increased. Based on a water flushing technology on the wall of a cofferdam and two semicircular ports positioned at the bottom of the cofferdam, the invention can reduce the impact of sludge intake on the flap valve and enhance the sealing property of the lower seal of the lower hermetic cabin.

Description

technical field [0001] The invention relates to a seabed sampling device, in particular to a gravity piston type long columnar sediment sampler which passes through the hydrate BSR interface. Background technique [0002] The investigation and evaluation of seabed gas hydrate resources usually adopt the method of bottom-like reflection surface (BSR) on the seismic section, but a large number of data show that BSR is not a direct indication of the existence of hydrates, resulting in distortion or distortion of the extracted information. At the same time, since hydrates can only exist stably at low temperature and high pressure, it is difficult to obtain samples by conventional sampling methods, and the cost of drilling is too high. [0003] Chinese invention patent CN1616944A discloses a "fidelity sampling integrated deep-sea sediment sampler", which can take samples of sediment, water, gas and natural gas hydrate on the seabed, and carry out heat preservation and pressure ma...

AI Technical Summary

Problems solved by technology

[0004] 1. The fidelity sampling cylinder is composed of three parts: the upper end of the fidelity cylinder with a sealed cone, the fidelity cylinder, and the cutter head with a petal mechanism. The length of the entire fidelity sampling cylinder is limited by the fidelity cylinder and cannot be made Very long, too long will not be able to process, install and transport well, so it will limit the amount of sampling;

[0005] 2. During the upward movement of the fidelity cylinder, the seabed soil rushes into the sealed cabin due to the pressure difference before the flap valve is closed, which affects the sealing effect of the sealed cabin;

[0006] 3. During the lifting process of the fidelity cylinder, the attached mud scraped off at the sample inlet end is highly viscous, and it is difficult to rely on the inverted cone to remove it, which affects the sealing of the sealing chamber; and the fidelity cylinder is lifted and sealed under the sealing chamber Vacuum will be generated during the time, and the silt will be sucked into the airtight chamber, which will affect the sealing effect

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