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Simulation experimental device for natural hydrate geological stratification

A technology for simulating experimental equipment and geological stratification, which is used in wellbore/well components, earthwork drilling, etc.

Active Publication Date: 2011-02-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Calculation using energy balance conditions and other calculations shows that, assuming no energy loss, the energy obtained from hydrate gas is 15.5 times that of decomposing hydrate. However, due to the economic and technical feasibility problems faced by the exploitation of natural gas hydrate, the development technology of natural gas hydrate is mainly in the stage of experimental research.

Method used

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  • Simulation experimental device for natural hydrate geological stratification
  • Simulation experimental device for natural hydrate geological stratification
  • Simulation experimental device for natural hydrate geological stratification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Formation type 1 gas hydrate reservoir geological stratification model:

[0024] see Figure 1 to Figure 2 As shown, the characteristics of type 1 natural gas hydrate reservoirs are that from top to bottom, the strata are mainly divided into upper caprock 9, hydrate layer 10, free gas layer below hydrate layer 10, lower caprock 12, upper caprock 9 Both the hydrate layer 10 and the free gas or water layer 11 contain sediments. In the simulation chamber 2 in the three-dimensional model 1, the semi-permeable partition layer 13 is placed between the hydrate layer 10 and the free gas layer below the hydrate layer 11, and the semi-permeable partition layer 13 that only permeates gas and does not permeate water is used. , the upper and lower surfaces of the semi-permeable partition layer 13 are respectively horizontal surfaces or arc-shaped surfaces with a high middle and low sides. Before the synthesis of natural gas hydrate, firstly, inject an appropriate amount of solutio...

Embodiment 2

[0027] Formation type 2 gas hydrate reservoir geological stratification model:

[0028] Type 2 natural gas hydrate reservoirs are characterized by the strata from top to bottom are mainly divided into the upper cap rock 9, the hydrate layer 10, the lower aquifer of the hydrate layer 10, and the lower cap rock 12, the upper cap rock 9 and the lower cap rock 12 are composed of low-permeability rocks, and the hydrate layer 10 and the free gas or water layer 11 both contain sediments. In the simulation chamber 2 in the three-dimensional model 1, the semi-permeable barrier layer 13 is placed between the hydrate layer 10 and the aquifer layer below the hydrate layer 10, and the semi-permeable barrier layer 13 that only permeates water but not gas is used. Before the synthesis of natural gas hydrate, first, inject an appropriate amount of solution into the simulation chamber 2 of the three-dimensional model 1 through the gas-liquid port 7 at the upper end. Near the interface, the in...

Embodiment 3

[0031] A type 3 gas hydrate reservoir geological stratification model is formed.

[0032] Type 3 natural gas hydrate reservoirs are characterized by the fact that the formation is mainly divided into upper caprock 9, hydrate layer 10, and lower caprock 12 from top to bottom, and the upper caprock 9 and lower caprock 12 are both composed of low-permeability rocks , the hydrate layer contains sediment. In the simulation chamber 2 in the three-dimensional model 1, the semi-permeable partition layer 13 is not used. Before the synthesis of natural gas hydrate, firstly, inject an appropriate amount of solution into the simulation chamber 2 of the three-dimensional model 1 through the gas-liquid port 7 at the upper end. Near the interface of the hydrate layer 10, the injected solution flows into the hydrate layer 10 under the action of gravity. Secondly, a certain amount of natural gas is injected into the free gas layer to a certain pressure through the gas-liquid port 8 at the lo...

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Abstract

The invention discloses a simulation experimental device for natural hydrate geological stratification. The device comprises a three-dimensional model, wherein the three-dimensional model is a stainless steel reaction kettle which has the pressure resistance of between 5 and 40Mpa, and the cavity volume of between 50 and 500L; the three-dimensional model comprises a barrel, and an upper flange and a lower flange respectively arranged above and below the barrel; a seal cavity among the barrel, the upper flange and the lower flange forms a closed simulation cavity; and the upper flange and the barrel as well as the lower flange and the barrel are connected and fixed through a plurality of bolts respectively. A semipermeable clapboard layer adopted by the device has the characteristics of high pressure resistance, corrosion resistance, high-temperature resistance and the like; the simulation cavity in the high-pressure three-dimensional model can be assembled and disassembled freely; specific numbers, sizes and the like can be selected flexibly; and the semipermeable clapboard layer having corresponding characteristics can be adopted conveniently aiming at different types of natural hydrate geological stratification conditions.

Description

technical field [0001] The invention relates to natural gas hydrate exploitation technology, in particular to a natural gas hydrate geological stratification simulation experiment device. Background technique [0002] Natural gas hydrate is an ice-like clathrate crystal compound composed of water and natural gas under certain conditions (suitable pressure, temperature, gas saturation, water salinity and pH value, etc.), which can burn when exposed to fire, commonly known as "Combustible ice", most of the hydrates that exist in nature are methane hydrates. Generally speaking, the methane obtained from the decomposition of hydrates is more than 160 times the volume of hydrates, and the total amount of natural gas in solid form is twice that of fossil fuels such as coal and oil on the earth. The most important strategic resource. In addition, methane contains less carbon than coal or petroleum, and the carbon dioxide produced by methane is only half that of coal, making it a ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 李小森李刚陈朝阳张郁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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