CN201284651Y - Solid-state exploitation experiment simulating device for natural gas hydrate - Google Patents

Abstract

The utility model relates to a device used for simulating a natural gas hydrate solid exploitation test, which is characterized in that the device comprises a vertical lifting pipe; the inlet at the lower end of the lifting end is connected with a material inlet bin and extends into the bin; the outlet of the upper end of the lifting pipe is connected with the upper part of a cylindrical separator; the bottom of the separator is provided with a turbine flowmeter and a solid grain weight-measuring device; the turbine flowmeter is connected with a liquid-level keeping water box; the solid grain weight-measuring device is connected with the inlet of the upper end of a grain recovery pipeline; the outlet of the lower end of the grain recovery pipeline is connected with a material inlet bin; the bottom of the liquid-level keeping water box is connected with the bottom of the material inlet bin by a pipeline; the vertical segment of the lifting pipe is provided with a plurality of gas injection pipelines which are provided with a plurality of gas injection holes communicated with the lifting pipe; the gas injection holes are connected in parallel with a gas output pipeline by the gas injection pipelines; and the gas output pipeline is connected with an air compressor by a rotor flowmeter and an air pressure adjuster. The utility model has the advantages of simple structure, convenient operation, exact simulation and the like, and can be applied to the laboratory simulation of ocean seepage-typed natural gas hydrate solid exploitation technology.

Description

A kind of simulating device for solid-state mining experiment of gas hydrate

Technical field

The utility model relates to a kind of natural gas extraction device, particularly relevant for a kind of simulating device for solid-state mining experiment of gas hydrate.

Background technology

Gas hydrates are found to be present in permafrost area and seabed widely, and its content is estimated at 2,000 trillion m ³About, be equivalent to the whole world twice of essential mineral (oil, coal, natural gas) phosphorus content.Gas hydrates have have a very wide distribution, characteristics such as the storage scale is big, energy density height, be considered to one of potential new forms of energy of 21 century.Development and utilization gas hydrates resource has become the task of top priority of national governments at energy field, particularly at the research that has the quality height, buries shallow and leakage type gas hydrate mining methods that distribute the to concentrate main direction of current research especially.Gas hydrates are mainly contained in the ocean, are the white solid state crystalline materials that natural gas forms with the water mutual effect under certain condition.Because the self-characteristic of gas hydrates, its exploitation method is different with the exploitation of conventional energy resource (as coal, oil, natural gas etc.).Coal is solid under mine, is still solid after the exploitation.Oil underground be fluid, be still fluid after the exploitation.And hydrate to bury on the ocean bottom be solid, molecular configuration changes in recovery process, becomes gas from solid.That is to say that hydrate undergoes phase transition in recovery process.The gas hydrates development technique that comprehensive various countries scientist proposes can be divided into two classes: underground decomposition exploitation and solid-state mining substantially.

Underground decomposition exploitation is the activities with reference to oil exploitation, at first in the stratum, form pit shaft, consider how to break artificially the temperature and pressure condition of gas hydrates stable existence then, the hydrate that will contain in deposit decomposes, and natural gas is adopted to ground at last again.Underground decomposition exploitation mainly comprises heating, voltage drop method and three kinds of methods of chemical agent method: 1) heating is that steam, hot water, hot salt brine or other hot fluid are pumped into the gas hydrates reservoir from ground, impels temperature to rise and reaches the decomposition temperature of hydrate.2) voltage drop method is by reducing moving of phase equilibrium line that pressure causes that gas hydrates are stable, thereby reaches the purpose of impelling gas hydrates to decompose.3) the chemical agent method is after chemical agents such as salt solution, methyl alcohol, ethanol are pumped into the stratum from wellhole, can change the phase balance condition that hydrate forms, and reduces the hydrate equilibrium temperature, causes the decomposition of gas hydrates.For underground decomposition exploitation, be easy to form reasons such as hydrate obstruction in the very long and pipeline owing to the pipeline of the instability of continental slope, laying, can produce certain technology and economic problems.Simultaneously, more than various production techniques itself limitation is all arranged, big as the heating heat waste, efficient is low, the voltage drop method exploitation rate is slow, chemical agent method expense costliness, environmental pollution is serious etc.More than these factors, all might make people be difficult to utilize these methods to come the exploitation of gas hydrate resource.

Different with underground decomposition exploitation, solid-state mining is that hydrate is transported to sea bottom surface with solid forms, carrying out preliminary silt in the seabed separates, adopt solid-liquid-gas three-phase conveying technology then, the gas that decomposites in solid water compound and the course of conveying is transported to the sea, utilize the high temperature seawater on sea that hydrate is decomposed then and obtain gas, the advantage of this method is that production efficiency is very high.Calculate with one day 2000T yield, its gas that comprises is approximately 32 ten thousand steres, is equivalent to a large-scale land gas well, simultaneously, in mixing defeated process, hydrate progressively decomposes from bottom to top, form the spontaneous motive force that makes progress thus, significantly reduce to carry and use the pump merit.In addition, in recovery process, need not inject energy, also just avoid the energy loss in conveying and the recovery process to the seabed.The more important thing is that similar techniques is successful Application in the exploitation of other marine resources (as manganese metal tuberculosis), provide reference for of the application of this technology thus in hydrate exploitation field.So far, also do not have a kind of experimental system that can be used for simulating solid-state mining both at home and abroad, bring difficulty for the actual exploitation of this method thus.

Summary of the invention

At the problems referred to above, the purpose of this utility model provides a kind of ocean leakage type simulating device for solid-state mining experiment of gas hydrate.

For achieving the above object, the utility model is taked following technical scheme: a kind of simulating device for solid-state mining experiment of gas hydrate, it is characterized in that: it comprises a riser of erectting, end entrance connects a feeding warehouse and stretches in the storehouse the tangential top that connects a cylindrical separator of described riser upper end outlet under the described riser; The described eliminator corresponding with exit position, described riser upper end is provided with an air outlet, described eliminator bottom is provided with a turbine flowmeter and a solid granulates weight-measuring device, described turbine flowmeter connects a liquid level and keeps water tank, described solid granulates weight-measuring device lower end connects the last end entrance of a particle recovery channel, and the lower end outlet of described particle recovery channel connects described feeding warehouse; Described liquid level keeps the bottom of water tank to be provided with a water inlet, and the bottom that described liquid level keeps water tank connects the bottom of described feeding warehouse by a pipeline, described feeding warehouse be provided with a pressure meter; Described riser vertically section is provided with several gas injection pipelines, described gas injection pipeline is provided with several gas injection ports that communicates with described riser, described gas injection port is by the described gas injection pipeline air delivering pipeline that is connected in parallel, described air delivering pipeline connects a spinner flowmeter, and described spinner flowmeter connects an air compressor machine by a barostat.

Described gas injection pipeline is arranged on the differing heights of described riser, and the quantity of setting is two or more.

The gas injection port that each described gas injection pipeline is injected into described riser is more than three or three.

The utility model is owing to take above technical scheme, it has the following advantages: 1, the utility model is provided with liquid level maintenance water tank, not only can make system's hydrostatic pressure steady, and can keep the permeability factor of liquid level adjusting change riser in the water tank to the airlift Effect on Performance by liquid level.2, riser gas injection of the present utility model is partly adopted the method that some gas injection pipeline segmentations are injected is set on differing heights, not only manage the process that interior gas increases gradually in the simulating hydrate decomposition process accurately, and can be used to simulate the gas injection degree of depth to the airlift Effect on Performance by changing different gas injection positions.3, the gas injection point of the utility model riser adopts porous (more than three or three) gas injection, to keep flow distribution evenness.The utlity model has simple in structure, easy to operate and simulate advantages such as accurate, can be applied to the laboratory simulation of marine natural hydrate solid-state mining technology.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present utility model

Fig. 2 is an A-A partial cutaway schematic among Fig. 1

The specific embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in detail.

As shown in Figure 1; the utility model comprises a riser 1 of erectting; 1 time end entrance of riser connects a feeding warehouse 2 and stretches in the storehouse; the tangential top that connects a cylindrical separator 3 of riser 1 upper end outlet; on the eliminator 3 corresponding, also be provided with an air outlet 4 with exit position, riser 1 upper end; eliminator 3 bottoms are provided with a turbine flowmeter 5 and a solid granulates weight-measuring device 6; turbine flowmeter 5 connects a liquid level and keeps water tank 7; solid granulates weight-measuring device 6 lower ends connect the last end entrance of a particle recovery channel 8, and the lower end outlet of particle recovery channel 8 connects feeding warehouse 2.Liquid level keeps the bottom of water tank 7 to be provided with a water inlet 9, and its bottom also is provided with a pressure meter 11 by the bottom of pipeline 10 connection feeding warehouses 2 on the feeding warehouse 2, is used for measuring the air pressure in the feeding warehouse 2.As shown in Figure 1 and Figure 2, vertical section of riser 1 differing heights is provided with four gas injection pipelines 12, gas injection pipeline 12 is provided with four gas injection ports 13 that communicate with riser 1, each gas injection port 13 is by gas injection pipeline 12 air delivering pipeline 14 that is connected in parallel, air delivering pipeline 14 connects a spinner flowmeter 15, and spinner flowmeter 15 connects an air compressor machine 17 by a barostat 16.

The utility model is before carrying out the solid-state mining simulated experiment, and feeding warehouse 2 is equipped with a large amount of solid granulates 18 in advance, is used to simulate the solid water compound in seabed.Solid granulates 18 is even spherical particle, and its density and particle diameter can be selected for use according to test requirements document.When promoting experiment, at first liquid level is kept water tank 7 fills with water, liquid level keeps water tank 7 can guarantee that not only hydrostatic pressure of the present utility model is steady, can keep the permeability factor of liquid level adjusting change riser 1 in the water tank 7 to the airlift Effect on Performance by liquid level simultaneously.Start air compressor machine 17 then, the gases at high pressure that air compressor machine 17 produces are regulated the air-flow power by air damper 16, and by spinner flowmeter 15 measurements and control air pressure flow, be injected in the riser 1 by the gas injection port 13 that communicates with riser 1 on air delivering pipeline 14 and the gas injection pipeline 12 successively again, make in the riser 1 to be full of pressure-air.Along with gas content in the riser 1 increases, make mixed liquor density in the riser 1 less than the density of water.At this moment under the effect of riser 1 and feeding warehouse 2 inside and outside differential pressures, the solid granulates 18 of solid water compound that is positioned at the simulation seabed of feeding warehouse 2 rises under the effect of pressure reduction, and with gases at high pressure and water formation mixed liquor after enter eliminator 3.Because the outlet of riser 1 upper end is tangentially to connect eliminator 3; therefore mixed liquor forms after entering eliminator 3 and rotatablely moves; thereby utilize centrifugal force and gravity that the gas in the mixed liquor is separated; isolated gas is discharged from the air outlet 4 of eliminator 3; isolated liquid is discharged into liquid level and keeps water tank 7 after turbine flowmeter 5 is measured lifting liquid phase flow; isolated solid granulates 18 carries out the solid volume measurement of concetration to solid granulates weight-measuring device 6, treats to turn back to feeding warehouse 2 by particle recovery channel 8 after test is finished.

In the foregoing description, the method that riser 1 gas injection partly adopts segmentation to inject, the quantity that gas injection pipeline 12 is provided with on differing heights can be two or more, the process that gas increases gradually in the pipe in the simulating hydrate decomposition process can be used to simulate the gas injection degree of depth to the airlift Effect on Performance by changing different gas injection positions simultaneously accurately.

In the foregoing description, each gas injection pipeline 12 is injected into the gas injection port 13 of riser 1 can be for more than three or three, to keep flow distribution evenness.

By adopting the utility model to experimentize, not only can measure each phase flow rate of gas phase, liquid phase and solid phase, grain diameter, the gas injection degree of depth and permeability factor, can also keep in the water tank 7 liquid levels to regulate changing in the lifting process solid-state decomposition of hydrate to the airlift Effect on Performance by liquid level, therefore can effectively simulate hydrodynamic characteristics in the solid water compound recovery process, the hydrate resolution characteristic and the feasibility study of solid-state mining technology etc. in flowing.

The utility model only describes with the foregoing description; the structure of each parts, the position is set and connects and all can change to some extent; on the basis of technical solutions of the utility model; all improvement and equivalents of individual component being carried out according to the utility model principle all should not got rid of outside protection domain of the present utility model.

Claims (3)

1, a kind of simulating device for solid-state mining experiment of gas hydrate, it is characterized in that: it comprises a riser of erectting, end entrance connects a feeding warehouse and stretches in the storehouse the tangential top that connects a cylindrical separator of described riser upper end outlet under the described riser; The described eliminator corresponding with exit position, described riser upper end is provided with an air outlet, described eliminator bottom is provided with a turbine flowmeter and a solid granulates weight-measuring device, described turbine flowmeter connects a liquid level and keeps water tank, described solid granulates weight-measuring device lower end connects the last end entrance of a particle recovery channel, and the lower end outlet of described particle recovery channel connects described feeding warehouse; Described liquid level keeps the bottom of water tank to be provided with a water inlet, and the bottom that described liquid level keeps water tank connects the bottom of described feeding warehouse by a pipeline, described feeding warehouse be provided with a pressure meter; Described riser vertically section is provided with several gas injection pipelines, described gas injection pipeline is provided with several gas injection ports that communicates with described riser, described gas injection port is by the described gas injection pipeline air delivering pipeline that is connected in parallel, described air delivering pipeline connects a spinner flowmeter, and described spinner flowmeter connects an air compressor machine by a barostat.

2, a kind of simulating device for solid-state mining experiment of gas hydrate as claimed in claim 1 is characterized in that: described gas injection pipeline is arranged on the differing heights of described riser, and the quantity of setting is two or more.

3, a kind of simulating device for solid-state mining experiment of gas hydrate as claimed in claim 1 or 2 is characterized in that: the gas injection port that each described gas injection pipeline is injected into described riser is more than three or three.

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