An experimental device for simulating the influence of pressure on formation fractures of natural gas hydrate
A technology for simulating pressure and experimental equipment, applied in the field of natural gas hydrate geology, can solve problems such as formation instability, natural gas hydrate decomposition, well kick, etc., and achieve the effect of simple operation
Inactive Publication Date: 2019-08-02
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
If there are large fractures or loose formations in the formation near the seabed gas hydrate layer, this will directly lead to the instability of the formation around the wellbore wall during drilling, which will easily cause the decomposition of gas hydrate, resulting in sampling difficulties, wellbore instability and Well kick or even blowout and other engineering problems
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[0009] The present invention will be further described below in conjunction with the accompanying drawings.
[0010] Such as figure 1 As shown, the present invention is an experimental device for simulating the influence of pressure on natural gas hydrate formation fractures, which mainly consists of booster pump 1, gas outlet 2, computer monitoring system 3, gas layer 4, water layer 5, pressure sensor 6, mudstone particles 7. It consists of nylon particles 8, rock layer A9, box body 10, rock layer B11, piston 12, piston ring 13, gas storage chamber 14, telescopic gas channel 15 and high-speed camera 16. The box body 10 is provided with a piston ring 13, a piston 12, an air layer 4, a water layer 5, a pressure sensor 6, a rock layer B11, mudstone particles 7, nylon particles 8 and a rock layer A9 from top to bottom; There are 4 gas outlets 2 with a symmetrical design for the gas to flow out and make the piston 12 move down.
[0011] Such as figure 1 As shown, the specific s...
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The invention relates to an experiment device used for simulating the influences of the pressure on a natural gas hydrate stratum fracture in the technical field of natural gas hydrate geology. The experiment device mainly comprises a pressurizing pump, gas outlets, a computer monitoring system, a gas layer, a water layer, a pressure sensor, mudstone particles, nylon particles, a rock stratum A, a case body, a rock stratum B, a piston, a piston ring, a gas reservoir, a telescopic gas channel and a high-speed camera. The piston ring, the piston, the gas layer, the water layer, the pressure sensor, the rock stratum B, the mudstone particles, the nylon particles and the rock stratum A are sequentially arranged in the case body from top to bottom; and the four gas outlets in the upper part of the piston ring are symmetrically designed, and are used for enabling the gas to flow out and driving the piston to move downwards. The experiment device is simple in operation, and can well simulate the process of the influences of the pressure on the stratum fracture near a natural gas hydrate layer.
Description
technical field [0001] The invention relates to an experimental device for simulating the influence of pressure on natural gas hydrate formation fractures in the technical field of natural gas hydrate geology. Background technique [0002] Natural gas hydrate is a loose crystalline compound formed by the interaction of water and methane through van der Waals force under low temperature and high pressure conditions, which looks like ice but has a different crystal structure from ice. Gas hydrates exist in two forms on the seabed, one exists on the seafloor surface, and the other exists hundreds of meters below the seafloor. Gas hydrates hundreds of meters below the seabed have different abundances depending on the depth of occurrence; the existence of gas hydrates in the vicinity of the gas hydrate layer under different ocean pressure conditions, and geological changes such as stress cracks have a significant impact on gas hydrates. Engineering work is of great significance....
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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 曹琰韩辉陈世加路俊刚
Owner SOUTHWEST PETROLEUM UNIV