CN101382063A - Novel underground coal gasification furnace - Google Patents

Abstract

The invention proposes a novel underground coal gasification furnace which is particularly suitable for the gasification of a coalbed containing water. An underground gasification furnace and a coalbed drainage passage integrated with each other are simultaneously constructed through a coalbed directional drilling process. The coalbed drainage passage can be effectively used for the coalbed drainage before gasification and the furnace body drainage during gasification, thereby ensuring the discharge of the water in the coalbed and consequently realizing the stable gasification of the coalbed containing water. The furnace has the advantages that the composite underground gasification furnace and the drainage passage are simultaneously constructed through the advanced coalbed directional drilling process, thereby bringing about easy execution and short construction period; as the drainage passage is positioned below the gasification passage, the drainage is smooth, and the problem of blockage does not easily happen; and the water in the drainage passage can be pumped out from a plurality of orientations, thereby bringing about rapid drainage. According to the requirements of furnace body drainage, the drainage holes of the gasification passage can be increased flexibly, thereby substantially solving the drainage problem of the coalbed containing water, and avoiding the impact of coalbed water inrush on coalbed gasification.

Description

A kind of novel underground coal gasification furnace

Technical field

The present invention relates to underground coal gasification(UCG) production technique field, mine, particularly coal underground gasifying furnace.

Background technology

The underground coal gasification(UCG) of no well formula is the gasification of being undertaken by boring in original coal seam.Original coal seam imports a large amount of underground water simultaneously owing to there is not coal seam water drainage measure in the drilling construction process.Therefore, for the coal seam under certain hydrogeological conditions, particularly a large amount of coal seam water can be contained in the brown coal coal seam.The existence of coal seam water is caused for igniting of coal underground gasification and extensive gasification and has a strong impact on.A large amount of coal seam water bursts usually can destroy the combustion gasification in coal seam even put gasification furnace out by water, can cause phreatic pollution simultaneously.Therefore make up at the gasification type of furnace and the drainage technology in moisture coal seam very necessary.Normally control pour in (the seeing U.S. Pat 2973811) of coal seam water abroad for the solution of coal seam water burst, or determine the suitable intensity of gasification (seeing U.S. Pat 4083402) according to water yield by vapor pressure.

This patent proposes a kind of novel underground coal gasification furnace that is specially adapted to moisture coal seam.Adopt coal seam directional drilling the technology underground gasification furnace and the coal seam drainage channel of integration construct simultaneously.The body of heater draining of the hydrophobic and gasification in the coal seam before the coal seam drainage channel can be used for gasifying effectively ensures the drainage of coal seam water, thereby realizes the stable gasification in moisture coal seam.

Summary of the invention

The objective of the invention is to design a kind of novel underground coal gasification furnace that is applicable to moisture coal seam, solve the pump drainage of the coal seam water of getting dirty in the hydrophobic and gasification in coal seam before the gasification, guarantee the stable gasification in moisture coal seam.

The present invention proposes to adopt incorporate underground gasification furnace of coal seam directional drilling technique construction and coal seam drainage channel, and it makes the problems referred to above be solved, and is a kind of practical invention.The type of furnace is taken into account coal seam gasification and body of heater draining, carries out the coal seam draining by the special-purpose drainage channel in the rock stratum that connects with the coal seam gasification passage, fundamentally solves the drainage problem of gasification furnace.

Technical scheme of the present invention: a kind of novel underground coal gasification furnace, this type of furnace are taken into account underground gasification furnace and draining stove (or passage) simultaneously, are implemented in the effective gasification in the high moisture coal seam.Gasification furnace and draining stove can be augmented steam vent or drain hole flexibly, satisfy coal seam gasification technology and drainage requirement thereof, guarantee the continous-stable operation of gasification.The type of furnace makes up and adopts ground vertically to creep into and coal seam directional drilling technology.Make up underground gasification furnace by directional drilling with a plurality of vertical drillings docking in the coal seam.Make up coal seam hydrophobic channel with vertical drilling docking of seat earth rock stratum by directional drilling.

Gasification furnace is made of a coal seam directional drilling and two or more vertical drillings.The coal seam directional drilling is 0.5 to 1 meter apart from the suitable distance of seat earth, about 100 meters of directional hole horizontal lengths.The boring size of vertical drilling is determined according to the needs of gas production.Vertical drilling can be respectively applied for gasification furnace igniting, gasification furnace exhaust and forward and reverse air blast gasification.Directional drilling can be used for the coal gas circulation.

The coal seam hydrophobic channel is made of a seat earth rock stratum directional drilling and two or more vertical drillings.Directional drilling as the coal seam hydrophobic channel need be deep into following 1 meter to 2 meters of seat earth, and transfers the drainage floral tube according to the seat earth lithology.

Running through the vertical drilling that the coal seam extends to drainage channel is the central core of circulation that underground gasification furnace is connected with drainage channel, and the coal seam water burst directly is pooled in the drainage channel by these passages.Can augment the quantity in hole according to gasification scale and drainage requirement.

Be pooled in the drainage channel coal seam water mainly by with the direct-connected upright opening of drainage channel, adopt the deep-well drainage pump in time to discharge, the deep well pump displacement will be near the coal seam water yield.

Advantage of the present invention is: utilize advanced coal seam directional drilling technology to make up compound underground gasification furnace and drainage channel simultaneously, implement short construction period easily; Because drainage channel is positioned at below the gasification tunnel, draining is unimpeded, is difficult for taking place blockage problem; Drainage channel can carry out multi-faceted drawing water, and draining is rapid.According to body of heater draining needs, can augment the drain hole of gasification tunnel more neatly; Fundamentally solved the drainage problem in moisture coal seam, avoided of the influence of coal seam water burst coal seam gasification.

Description of drawings

Fig. 1 is the longitudinal sectional view of novel underground coal gasification furnace of the present invention.

Among the figure, the 1-coal seam; The 2-seat earth; 3,4,7-draining vertical drilling; 5,6, the 9-vertical drilling that gasifies; The 8-drainage channel; The 10-gasification tunnel.

The specific embodiment

With reference to diagram and according to the type of furnace arrange, the function of respectively holing, the structure implementation process of this novel underground coal gasification furnace is as follows:

1. make upvertical drillings 3 and 4 (aperture is determined according to actual needs, and is as follows) from thebase plate 2 of ground separation certain distance, andbase plate 2 about 1 to 2 meter is goed deep in boring tocoal seam 1;

2. between boring 3 and 4, select a bit (depending on that with the distance of boring 3,4 directed drilling tool looks for the ability and the boring bearing capacity of target spot) to make up boring to the coal seam, and be deep into apart from 0.5 to 1 meter of seat earth as the position ofvertical drilling 5;

3. select a bit to make upvertical drilling 6 to the coal seam on the straight line at surface drilling 3 and 4 places, the degree of depth that enters the coal seam is close with boring 5;

4. on the straight line atsurface drilling 3 and 4 places, select a bit (satisfying constructed horizontal orientation hole length of later stage about 120 meters) to make up vertical drilling 7 to the coal seam, when entering appropriate depth, begin deflecting, to guarantee that constructed horizontal orientation hole of later stage is in seat earth and apart from 1 to 2 meter in coal seam, be communicated with boring 3 and 4 in the horizontal drilling process, be built into the drainage channel 8 of low dip, with 3 bottoms of holing is minimum point, is convenient in the passage charge for remittance and flows;

5. on the straight line at surface drilling 3 and 4 places, select a bit to make upvertical drilling 9 to the coal seam, when entering appropriate depth, begin deflecting, guarantee that transferring level about 0.5 to 1 meter the time atdistance seat earth 2 creeps into and make upgasification tunnel 10, keep parallel with drainage channel 8 in, be communicated with andhole 6,4 and 5;

6. whether decision transfers the drainage floral tube in drainage channel 8 according to the rock behavio(u)r ofseat earth 2, whether transfers gasification tunnel according to the coal characteristic decision incoal seam 1 and props up pillar, transfer in all vertical drillings sleeve pipe to thecoal seam 1 upper surface;

7. after gasification furnace builds up, from the 3 employing deep water pump pump drainage water of holing, coal seam in boring 5 and 6 is exposed, can implement igniting from holing 5 or 6, according to technology different arrangement gasifying agent injection hole, aerogenesis hole, in the process of gasification, keep the pump drainage water of boring 3, avoid underground water that gasification furnace is affected greatly;

8. expand planning, draining needs etc. according to the moving of gasification face, stove district, can around this gasification furnace or its, increase vertical drilling and directional drilling flexibly, in the hope of realize gasification furnace long-term, stable, efficiently move.

Claims (10)

1. novel underground coal gasification furnace, it is characterized in that: this type of furnace is taken into account underground gasification furnace and draining stove or drainage channel simultaneously.

2. novel underground coal gasification furnace according to claim 1 is characterized in that: make up underground gasification furnace by directional drilling with two or more vertical drillings docking in the coal seam; Make up coal seam drainage channel with two or more vertical drillings docking of seat earth by directional drilling.

3. novel underground coal gasification furnace according to claim 2 is characterized in that: gasification furnace coal seam directional drilling is 0.5 to 1 meter apart from the distance of seat earth, about 100 meters of directional hole horizontal lengths.

4. novel underground coal gasification furnace according to claim 2 is characterized in that: the gasification furnace vertical drilling is respectively applied for gasification furnace igniting, gasification furnace exhaust and forward and reverse air blast gasification; The gasification furnace directional drilling is used to produce coal gas and coal gas circulation.

5. novel underground coal gasification furnace according to claim 2 is characterized in that: the directional drilling as the coal seam hydrophobic channel need be deep into following 1 meter to 2 meters of seat earth.

6. novel underground coal gasification furnace according to claim 2 is characterized in that: whether the rock behavio(u)r decision according to seat earth 2 transfers the drainage floral tube in drainage channel 8; Whether transfer gasification tunnel according to the coal characteristic decision in coal seam 1 and prop up pillar; Transfer in all vertical drillings sleeve pipe to the coal seam 1 upper surface.

7. novel underground coal gasification furnace according to claim 1, it is characterized in that: running through the vertical drilling that the coal seam extends to drainage channel is the central core of circulation that underground gasification furnace connects with drainage channel, and the coal seam water burst directly is pooled in the drainage channel by these passages.

8. novel underground coal gasification furnace according to claim 7 is characterized in that: the quantity that can augment the hole, central core of circulation according to gasification scale and drainage requirement.

9. novel underground coal gasification furnace according to claim 1, it is characterized in that: be pooled in the drainage channel coal seam water by with the direct coupled upright opening of drainage channel, adopt the deep-well drainage pump in time to discharge, the deep well pump displacement will be near the coal seam water yield.

10. according to described any one novel underground coal gasification furnace of claim 1～9, it is characterized in that: gasification furnace and draining stove can be augmented steam vent or drain hole, satisfy coal seam gasification technology and drainage requirement thereof.

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