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WO2009157811A1 - Procédé de gazéification souterraine de charbon (et variantes) et procédé de purification des eaux souterraines - Google Patents

Procédé de gazéification souterraine de charbon (et variantes) et procédé de purification des eaux souterraines Download PDF

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Publication number
WO2009157811A1
WO2009157811A1 PCT/RU2009/000315 RU2009000315W WO2009157811A1 WO 2009157811 A1 WO2009157811 A1 WO 2009157811A1 RU 2009000315 W RU2009000315 W RU 2009000315W WO 2009157811 A1 WO2009157811 A1 WO 2009157811A1
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WIPO (PCT)
Prior art keywords
wells
underground
gasification
gas generator
blast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/RU2009/000315
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English (en)
Russian (ru)
Inventor
Александр Мирославович КАРАСЕВИЧ
Ефим Вульфович КРЕЙНИН
Елена Васильевна ДВОРНИКОВА
Станислав Геннадьевич СТРЕЛЬЦОВ
Белла Юрьевна СУШЕНЦОВА
Алексей Юрьевич ЗОРЯ
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Gazprom Promgaz OAO
Original Assignee
Gazprom Promgaz OAO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from RU2008125726/03A external-priority patent/RU2359116C1/ru
Priority claimed from RU2008125721/03A external-priority patent/RU2360106C1/ru
Priority claimed from RU2008125723/03A external-priority patent/RU2358915C1/ru
Application filed by Gazprom Promgaz OAO filed Critical Gazprom Promgaz OAO
Publication of WO2009157811A1 publication Critical patent/WO2009157811A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/06—Reclamation of contaminated soil thermally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • E21B33/16—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor
    • E21B33/165—Cementing plugs specially adapted for being released down-hole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells

Definitions

  • the concentration of chemical pollutants in the underground waters of the spent gas generator is orders of magnitude lower than in the condensate recovered with CCGT gas, but still exceeds the corresponding MPC.
  • the objective of the proposed group of inventions united by a single inventive concept, is to create a comprehensive and universal solution aimed at preventing the pollution of groundwater by chemical pollutants, both generated in the process of coal gasification and remaining in the waste space of the underground gas generator.
  • the technical result is to minimize the migration of gasification products from an underground gas generator, and, consequently, a significant reduction in the possibility of groundwater pollution due to the creation of a system of reaction channels, including at a great depth (up to 1000 m), which allows underground coal gasification (CCGT) by the traditional and efficient flow method at low pressure (up to 0.3 MPa), as well as thin groundwater treatment directly in the waste space of the underground gas generator, which completed the operational operation.
  • CCGT underground coal gasification
  • the problem is solved and the technical result is achieved in one embodiment by the fact that in the method of environmentally friendly underground coal gasification, which consists in drilling a series of wells in the gasification section, combining the blow and exhaust pipes into a single underground gas generator with the initial gasification reaction channel by igniting the coal seam at assistance of transverse directional horizontal and vertical wells connected to it, preparation of gas vents and operation of blast wells in the process of gasification when controlling the pressure in the underground gas generator and adjusting the hydraulic regimes of the blast and gas outlet wells, controlling the hydrostatic level of groundwater and the concentration of chemical pollutants in groundwater using hydro-observation and drainage wells and lowering the hydrostatic level of groundwater by incorporating vertical wells that equip to the beginning of the gasification process as drainage and drainage wells, the gasification process was carried out consistently in two stages - injection at elevated pressure in the underground gas generator and injection and suction at minimum pressure in the underground gas generator, and when the concentration of chemical pollutants in underground waters increases in the water observation and / or drainage wells in the first stage of
  • hydrostatic groundwater levels in the gasification section are recorded according to the data of hydraulic observation and drainage wells and a plot of the deposition funnel above and next to the underground gas generator is constructed from them, then these plots are used to adjust the hydraulic regimes of the blast and exhaust wells, as well as for determining the moments of inclusion or shutdown of drainage and sump wells.
  • groundwater is purified using the biological method of decomposition and neutralization of pollutants.
  • the preparation of a gas outlet well of an underground gas generator usually consists of drilling a well, consisting of a cased part, passed through rocks containing a coal seam, and performed in the form of a double metal column with a water supply in the annular gap between the pipes to supply water to the end of the cased part of the well and cooling of the exhaust hot gas through its inner pipe, as well as the unfrozen part, passed through the coal seam, and thermally worked out by means of a controlled counterflow the combustion zone along the drilling channel to meet the air blast injected into the well, while the water supply in the annular gap of the cased part of the gas outlet well is completed in the rock of the roof or soil near the boundaries of their contact with the coal seam, and the inner pipe of the cased part of the well is completed in the initial zone of the coal seam, moreover, the device for monitoring the position of the combustion zone in the gas well is placed at the end of its inner casing string, the movement of the combustion zone to it is recorded, and after moving it to column flue wellbore pumping amount
  • the gas exhaust well is gradually transferred from the mode of injection of air blast to the regime of intensive gas removal from the underground gas generator.
  • a control system is installed to control the movement of the combustion chamber towards the injected minimum flow rate of air blast, the dependence of the rate of countercurrent movement of the combustion zone on the flow rate of the air blast is determined and distributed to the operating modes of the remaining blast wells of the underground gas generator.
  • the gas degassing is controlled around each of the blast holes of the underground gas generator and ensure uniform advance of the fire face across the entire width of the gas generator.
  • the problem is solved and the technical result is achieved by the fact that according to the invention in a method of environmentally friendly underground gasification of coal lei, consisting in drilling a series of wells in the gasification section, casing them all the way, including rock and coal parts, connecting the blast and gas outlet wells into a single underground gasifier with the initial gasification reaction channel by igniting a coal seam using a transverse horizontal well and connected with it, at least one vertical well, the preparation of gas outlets and the operation of blast holes in the process of gasification while monitoring the pressure in underground gas generator and adjusting the hydraulic regimes of blast and gas outlet wells, monitoring the hydrostatic level of groundwater and the concentration of chemical pollutants in groundwater using hydro-observation and drainage wells and lowering the hydrostatic level of groundwater by including drainage wells and at least one vertical well , which is equipped at the beginning of the gasification process as a sump, the connection of blast and gas wells in a single underground
  • the second gasifier with the initial gasification reaction channel is fired by firing up the casing and expanding the first
  • coal parts of the gas and lateral horizontal wells are cased to the entire length with a countersunk casing
  • At least two vertical wells of which are subsequently connected to a transverse inclined horizontal well, are located at the lateral boundaries of the underground gas generator;
  • lateral directional wells are drilled along the coal seam along the lateral boundaries of the underground gas generator, cased along their entire length, including rock and coal parts, connected to vertical wells located along the lateral boundaries of the underground gas generator, and fire development is carried out with flashing casing and the expansion of the coal parts of the directional wells by means of countercurrent movement of the combustion site by injection of blast in them, and to reduce the hydrostatic level of groundwater, they are selected from the directional wells through vertical wells located along the lateral boundaries of the underground gas generator, which are equipped to start gasification in quality of drainage;
  • the underground waters of the underground gas generator will be purified using the biological method of decomposition and neutralization of pollutants.
  • coal seam degasses along a transverse inclined horizontal well the appearance of combustion products and the increase in static pressure on the heads of the gas outlet wells, which can be inclined or horizontal, respectively, for inclined and horizontal coal seams, are controlled, and after signs of their hydrodynamic connection with the reaction channel along an inclined horizontal well begin to pump air into these gas outlet wells Tie for countercurrent movement of the combustion zone and the expansion of their coal part.
  • gas is initially removed through a vertical (fulfilling the function of an ignition) well, and then through directional or directional horizontal wells, which are gradually put into operation (after fire expansion). In this case, the casing is melted and the coal parts expand.
  • the preparation of a gas outlet well can be completed by creating an underground separator tank.
  • a comparative analysis of the proposed solution with the known ones shows that the claimed method in the proposed set of essential features is formulated for the first time and gives the problem of CCGT development, especially at great depths, while minimizing the migration of gasification products from the underground gas generator to a specific and universal nature, that is, it is new.
  • the inventive method also corresponds to the inventive step, since the distinguishing features and their combination allow (in contrast to the negative experience of the mid 8Ox years of the XX century in the city of Tulen) under the conditions of high mountain pressure at a depth of 1000 m to carry out underground gasification in free coal channels.
  • the proposed method is illustrated by the schematic diagram of the underground gas generator module and the technological regulations for its preparation for operation in the presence of rock pressure.
  • the task is also solved and the technical result is achieved by the fact that in the method of groundwater purification in the waste space of an underground gas generator, characterized by the use of the biological method of decomposition and neutralization of chemical pollutants generated during coal gasification in a single underground gas generator with an initial gasification reaction channel and a series of wells including transverse oblique horizontal, blasting, venting and at least one vertical well s, after completing the process of coal gasification and filling the waste space of the underground gas generator with underground water, the bacterial medium is periodically introduced through the wells into the underground water of the underground gas generator waste space, and the type of bacteria of the bacterial medium is selected taking into account the composition and concentration of chemical pollutants in the underground water, for which from time to time, samples are taken through the wells and subjected to chemical analysis.
  • the volume of groundwater in the waste space of the underground gas generator is periodically mixed by forcing air into one well and discharging it through other wells;
  • ignition wells of the initial gasification reaction channel transverse oblique horizontal and / or at least one vertical well as wells for air injection, and blow and / or gas outlet wells as air exhaust wells;
  • the method also corresponds to the inventive step, since no solutions have been identified in the prior art, of which signs are known that allow the biological treatment of groundwater directly in the waste space of the underground gas generator using an environmentally friendly method.
  • FIG. Figure 1 shows the dynamics of the migration of phenols and ammonia from the existing gas generator at the South Abinsk Podzemgaz station.
  • FIG. 3 shows the module of the underground gas generator according to the proposed method in the initial stage of the gasification process - preparatory.
  • FIG. Figure 5 shows the dynamics of the migration of phenols and ammonium from the spent gas generator of the Podzemgaz South-Abinsk station.
  • FIG. 6 shows a schematic diagram of an underground gas generator that has completed its operation (in the plane of a coal seam).
  • FIG. 7 shows the actual data on the concentration of phenols in groundwater extracted from the worked out space of the underground gas generator using a submersible pump and airlift.
  • the underground gas generator is a source of chemical pollution of groundwater.
  • the concentration of phenols reaches 0.1 mg / L and ammonium - 15 mg / L, which exceeds the MPC by 100 and 10 times, respectively.
  • the concentration of these pollutants approaches the maximum permissible.
  • the task is to find a way to minimize the migration of chemical pollutants outside the underground gas generator, which will save groundwater for drinking water supply.
  • the method is as follows. At the gasification section, a series of wells is drilled, represented by gas outlet and blast wells 1,2, transverse oblique-horizontal 3, vertical (drainage) 4, hydro-observation and drainage wells 5, 6, respectively.
  • Gas exhaust and blast wells 1.2 are parallel located and directed along the coal seam.
  • Wells 1.2 are connected into a single underground gas generator with the initial reaction channel for gasification by firing up a coal seam using a transverse oblique-horizontal 3 and vertical wells 4 connected to it.
  • the directional wells 7 are drilled along the coal seam along the lateral boundaries of the underground gas generator, connected to vertical wells 8, which are connected to the transverse inclined horizontal well 3, and, in order to obtain effective drains 9, they fire the development of the coal part of the barrier directional wells 7 by means of countercurrent movement of the combustion site by blowing them. Drilling of barrier directional wells 7 and subsequent connection with vertical wells 8 is carried out using modern navigation systems. If necessary, these wells 7 and 8 can be connected to each other by one of the known methods, for example, by hydraulic fracturing of a coal seam.
  • the drainage and drainage wells are equipped with 4.8.6 necessary water-lifting equipment, and 4.8 wells have hydraulic connection on the ignition horizon 10.
  • Gas outlet wells 1 consist of cased and uncased parts.
  • the cased part is passed through the rocks outside the zone of their displacement and is made in the form of a double metal column with a water supply placed in the annular gap between the pipes to supply water to the end of the cased part of the well and cool the exhaust hot gas through its inner pipe.
  • the uncased part is passed through a coal seam.
  • the water supply in the annular gap of the cased part of the exhaust well 1 is completed in the roof or soil rock near the nearest boundaries of their contact with the coal seam, and the inner pipe of the cased part of the well is completed in the initial zone of the coal seam.
  • a device is installed to control the position of the combustion zone in the exhaust gas well.
  • YY % f k -K.L. ⁇ y -B g . ⁇ g , where: ⁇ V g - amount of forced air blast, m; f k - the average cross-sectional area of the worked open part of the gas outlet of the underground separator, m 2 ; k is the coefficient of increase in the area of the passage section of the gas outlet of the underground separator;
  • L is the length of the gas part of the coal seam under the lower end of the inner pipe of the gas outlet well along its uncased part, m;
  • ⁇ y is the specific gravity of the gas to be gased out, t / m 3 ;
  • the value of the coefficient “l:” varies over a wide range from 50 to 150, while its minimum values are used for heat-resistant coal lying in dense rocks (for example, siltstones), and the maximum for heat-resistant coal (lean) lying in weak rocks ( e.g. sandstones, limestones).
  • the gas outlet 1 is gradually transferred from the injection mode of the air blast to the regime of intensive gas removal from the underground gas generator.
  • the gasification process is carried out sequentially in two stages - injection at elevated pressure in the underground gas generator and injection-suction at minimum pressure in the underground gas generator.
  • the first stage of the gasification process is carried out at elevated pressure in the underground gas generator, approximately equal to the pressure of the existing hydrostatic column of groundwater in the gasification section. For this, a hydrostatic uro the level of groundwater above the initial gasification reaction channel, during the formation of coal, a decrease in this level is monitored with the aid of observation and drainage wells 5.6 and, accordingly, pressure on the blast holes 2 is reduced to 0.2 ⁇ 0.3 MPa. Then go to the second stage of the gasification process, which is carried out at a minimum pressure in the underground gas generator, for which they fix the static pressure in the underground gas generator.
  • 4,8,6 groundwater taken by drainage and drainage wells is treated in a surface complex for chemical pollutants.
  • they control the pressure in the underground gas generator and adjust the hydraulic regimes of the blast and exhaust wells 2.1, control the hydrostatic level of groundwater and the concentration of chemical pollutants in groundwater with the help of observation and drainage wells 5.6 and reduce the hydrostatic level of groundwater by inclusion of 4.8 (drainage) wells and drainage wells 6.
  • the operation of the blast holes 2 consists in the controlled supply of air blast (oxidizer) to the reaction coal surface along the length of the cased blast wells 2, including and along the coal seam, as well as with the fixation of the burning center along its length.
  • the combustion zone is fixed by hydrodynamic regulation of air blasting from the minimum at which the combustion zone is moved along the borehole towards the blast being blown up to the maximum flow rate at which the combustion zone is fixed in the nearest zone of the hot surface of the coal seam and coal is emitted in it with high heat and power indicators.
  • the technological regulation of the operation of the blast hole is carried out in the following sequence:
  • the first injected blast hole 2 of the underground gas generator is equipped with a control system for the movement of the combustion focus towards the air blast.
  • the dependence of the rate of movement of the combustion zone on the flow rate of air blast is determined and distributed to the operating modes of the remaining blast wells 2 of the underground gas generator.
  • the firing face is uniformly distributed across the entire width of the underground gas generator.
  • the ignited zone of the coal seam moves along the path of the blast hole, providing controlled contact of the oxidizer with the reaction coal surface.
  • groundwater is purified using the biological method of decomposition and neutralization of pollutants.
  • the initial gasification reaction channel is formed, wells 1, 2 are connected into a single underground gasifier with the initial gasification reaction channel. To do this, ignite the coal seam using a transverse oblique-horizontal 3 and vertical wells 4 connected to it.
  • the coal seam is ignited in the bottom of a vertical well, for example, 4 or 8, located closer to the end part of the transverse inclined horizontal well 3 and, when the air blast 3 is fed into the well 3, the burning center moves towards air blast, forming the initial reaction channel for the gasification of a single underground gas generator on the horizon of the initial ignition.
  • directional wells 7 are drilled along the lateral boundaries of the underground gas generator, cased before entering the coal seam, connected to vertical wells 8, and firing of the coal part of the directed directional wells 7 is carried out by counter-moving the burning focus injection of blast in them (1000 ⁇ 1500 nm 3 / h).
  • the burning center moves towards the air blast, forming a thermally prepared drain 9 with a diameter of 800-1000 mm with well-permeable side walls.
  • the created artificial collector is a reliable drain for groundwater extracted using a pump, subsequently lowered into a vertical well 8, which is equipped as a drainage system at the beginning of the gasification process.
  • lateral drainage drains are included in the work 9.
  • water-observation wells are drilled in the gasification section 5.
  • drainage wells 6 perforated throughout the underground gas generator and employees to drain the gasification area, including for preliminary drainage.
  • the technological regulations and the sequence of the proposed method are as follows.
  • the pressure of the blast injection into the well 2 is set to a value close to the pressure of the hydrostatic column of groundwater existing in the gasification section.
  • this level is designated as I and corresponds to 200 m above the initial ignition horizon (the coal part of the transverse deviated horizontal well 3).
  • the pressure in the underground gas generator is set to approximately 1.5 MPa. And so, consistently lowering the hydrostatic level groundwater in an underground gas generator to 100 m (W), 50 m (GV) and, finally, 25 m (V), reduce the pressure on the blast holes 2 and in the underground gas generator, to about 1.0 MPa, 0.5 MPa and 0.2 ⁇ 0.3 MPa, respectively. Pressure 0.2 ⁇ 0.3 MPa corresponds to the pressure of air for gasification by low pressure blowers.
  • water observation and drainage wells 5.8 are used not only for monitoring the position of the groundwater level (I-GV), but also for the concentration of chemical pollutants (gasification products) in them.
  • the hydrostatic level of groundwater is increased by turning off the pumps in drainage and drainage wells 4,8,6.
  • the productivity of the pumps in the drainage wells 4.8 is increased and, at the same time, the capacity of the smoke exhausters in the exhaust wells 1 is increased.
  • FIG. Figure 2 shows in a simplified form the change in such plots of groundwater level (I-V) during the CCGT process (dashed lines).
  • the staff of the underground gas generator adjusts the hydraulic mode at the blast and exhaust wells 2.1, and also makes a decision on whether to turn pumps on or off in drainage and drainage wells 4,8,6.
  • the considered example of the application of the proposed method of environmentally friendly CCGT is a reliable means of preserving the hydrosphere in the area of gasification of a coal seam from pollution of groundwater.
  • the traditional design of the underground gas generator consists of a series of parallel-located oblique-horizontal gas outlet and blast wells 1, 2. Their paths intersect with a transverse oblique-horizontal well 3. Drilled vertical wells 4, which are connected to an oblique-horizontal well 3, as well as observation, drainage and overseas
  • the blast and gas outlet wells 2.1 intersect with a transverse inclined horizontal well 3 at the ignition horizon 10, while the gas outlet wells 1 may have tanks 11 of an underground separator (FIG. 3).
  • the final stage of the final (final) gasification is represented by the end line 13 of the outgassing of the coal seam, limiting the waste space (gaseous volume) 14.
  • the method is as follows. A series of wells are being drilled.
  • Wells 1,2,3,7 of the underground gas generator: gas discharge, blow, horizontal inclined, including obstruction directed along the coal seam (if any) are cased to the entire length, including the rock and coal parts, and the coal part ( ⁇ 300 in length) m) gas outlet 1, inclined-horizontal ( ⁇ 320 ⁇ 400 m long) 3 and blocking wells directed along the coal seam (-300 m long) 7 are blocked by a free pipe, for example, a secret pipe string (shown in dashed lines), with a diameter slightly smaller drill pipe diameter ala.
  • Vertical wells 4, 8 are cased and completed in a coal seam.
  • Observation and drainage wells 5.6 are constructed in the usual way. Drainage wells 6 are usually perforated over the entire length and are used to drain the gasification area, including for preliminary drainage. Between the wells 1, the distance can be ⁇ 80 ⁇ 100 m.
  • Drilling of barrier directional wells 7 and subsequent connection with vertical wells 8, as well as other wells 1,2,3,4, is carried out using modern navigation systems and a technological tool known to specialists.
  • a coal seam is ignited and high pressure air is injected to develop a high-temperature ignited zone. Simultaneously with the ignition of the coal seam, pressure is monitored on the heads of the closed wells 1 and 3 and periodically take gas samples from them for chemical analysis. After the appearance of coal combustion products in the samples taken, as well as the growth of static
  • SUBSTITUTE SHEET (RULE 26) pressure at the heads of these wells, they begin to pump air blast in the amount of 800 ⁇ 1000 m 3 / h. Gas is removed through a vertical well 4 and / or 8.
  • the control of the location of the combustion zone, moving along the coal part of the wells 3 and 1, is carried out in a known manner using heat-closing electrical circuits connected to the surface with an electric measuring device [RU 2236599, 2004].
  • This well-known tool is an electric wire for the entire length of the well, along the length of the wire soldered (after 20 ⁇ 40 m) devices filled with fusible metal (for example, Wood alloy).
  • fusible metal for example, Wood alloy
  • gas outlet wells 1 are prepared, 4.8 vertical wells are equipped as drainage wells, and the most productive phase of the coal seam gasification process is set up.
  • the 4.8.6 underground water taken by drainage and drainage wells is cleaned from the surface complex from chemical pollutants.
  • the underground water is purified using the biological method of decomposition and neutralization of pollutants.
  • the claimed invention allows to realize the main advantage of CCGT unit - the deserted development of coal seams by converting them into combustible gas at depths of 500 ⁇ 10,000 and more than meters while minimizing the migration of gasification products from an underground gas generator.
  • the third object of the proposed group of inventions relates to a method for purifying groundwater in the waste space of an underground gas generator.
  • the concentration of ammonium and phenols in the center of the stopped gas generator is 7 and 0.0042 mg / l, respectively, and only at a distance of 200 m their values decrease to the maximum allowable concentrations of 2 and 0.001 mg / l, respectively.
  • the task is to find a way to minimize the concentration of the mentioned pollutants to MPC directly in the spent space of the underground gas generator.
  • FIG. B The fragment of an underground gas generator (FIG. B) shows a series of wells of a single underground gas generator with an initial gasification reaction channel represented by gas outlet and blast wells 1,2, which can be directional or directional-horizontal, respectively, for inclined and horizontal coal seams.
  • Blast and gas discharge wells 2.1 are initially intersected by a transverse deviated horizontal well 3, to which vertical wells 4 are connected.
  • the final stage of the final (final) gasification is represented by the end line 13 of the outgassing of the coal seam, limiting the waste space (gaseous volume) 14.
  • Gassed (waste) space (gassed volume) 14 is filled with ash, collapsed roof and groundwater.
  • the method is as follows.
  • the bacterial medium (special bacteria) is introduced into the production wells of the spent gas generator. Bacteria are spontaneously distributed in the amount of groundwater that fills the spent space 6 of the underground gas generator. Enzymes produced by bacterial microorganisms catalyze the biochemical oxidation (breakdown) of phenols. Depending on composition and concentration
  • the volume of groundwater must be mixed.
  • air is supplied periodically to some wells, for example, ignition channels of the initial gasification reaction channel (transverse directional horizontal 3, vertical 4 wells), and it is vented through other wells, for example, blast and gas outlet wells 2.1.
  • the indicated air supply and exhaust scheme is more preferable (better conditions for sparging are created), since air is introduced at the ignition horizon, and the output is at the end line 13 of the outgassing of the coal seam, at which lower ends are located at this point (final gasification stage) wells 1.2.

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Abstract

La présente invention concerne un procédé de gazéification souterraine de charbon. Elle a pour objet de prévenir la contamination des eaux souterraines. Une série de puits est forée sur un site de gazéification. Les puits de soufflage et d’évacuation des gaz sont regroupés en un seul générateur de gaz souterrain au moyen d'un puits transversal incliné et de puits horizontaux et verticaux connectés à celui-ci. La pression dans le générateur de gaz souterrain, le niveau hydrostatique des eaux souterraines et la concentration des contaminants chimiques sont surveillés au cours de la gazéification. On règle les modes hydrauliques des puits de soufflage et d’évacuation des gaz. Le procédé de gazéification souterraine de charbon est mis en œuvre de manière successive en deux stades : un stade d’injection mis en œuvre à une pression élevée dans le générateur de gaz souterrain; et un stade d’injection et d’aspiration mis en œuvre à une pression minimale dans le générateur de gaz souterrain. Au premier stade de gazéification souterraine de charbon, le niveau hydrostatique des eaux souterraines est relevé par la déconnexion de puits d’évacuation et de drainage d’eau; au second stade de gazéification souterraine de charbon, on augmente la performance d’évacuation d’eau et d’extraction de fumée dans les puits d’évacuation de gaz. Les eaux souterraines extraites sont purifiées dans un système de surface par l’élimination de contaminants chimiques. La deuxième variante du procédé de gazéification de charbon se distingue en ce que les puits sont munis d’un tubage sur toute leur longueur y compris la partie dans la roche et celle dans le charbon. Le raccordement des puits de soufflage et d’évacuation des gaz se fait par le traitement avec des flammes, les colonnes de tubages étant vitrifiées, et les parties charbon étant élargies grâce au puits transversal incliné et aux puits horizontaux et verticaux connectés à celui-ci et aux puits d’évacuation de gaz, en commençant par le lieu adjacent à l’allumage de la strate de charbon. La purification des eaux souterraines est mise en œuvre dans l’espace utilisé du générateur de gaz souterrain par la dégradation biologique et par la neutralisation des contaminants chimiques produits durant le processus de gazéification souterraine de charbon.
PCT/RU2009/000315 2008-06-26 2009-06-24 Procédé de gazéification souterraine de charbon (et variantes) et procédé de purification des eaux souterraines Ceased WO2009157811A1 (fr)

Applications Claiming Priority (6)

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RU2008125726 2008-06-26
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CN101864941A (zh) * 2010-03-23 2010-10-20 邓惠荣 超深层煤炭地下气化技术
RU2522785C1 (ru) * 2012-10-26 2014-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тульский государственный университет" (ТулГУ) Способ подземной газификации тонких и средней мощности пластов бурого угля
CN104088617A (zh) * 2014-06-24 2014-10-08 新奥气化采煤有限公司 一种煤炭地下气化进、出气孔结构
CN104088588A (zh) * 2014-06-24 2014-10-08 新奥气化采煤有限公司 一种煤炭地下气化用套管及煤炭地下气化进、出气孔结构
US9428978B2 (en) 2012-06-28 2016-08-30 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
US9435184B2 (en) 2012-06-28 2016-09-06 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
RU2678246C1 (ru) * 2017-07-25 2019-01-24 Федеральное государственное бюджетное учреждение науки Институт горного дела Севера им. Н.В. Черского Сибирского отделения Российской академии наук Способ подземной газификации угля в условиях криолитозоны

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RU1838598C (ru) * 1992-02-19 1993-08-30 ГАШугина Способ очистки загр зненных подземных вод
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101864941A (zh) * 2010-03-23 2010-10-20 邓惠荣 超深层煤炭地下气化技术
US9428978B2 (en) 2012-06-28 2016-08-30 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
US9435184B2 (en) 2012-06-28 2016-09-06 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
US9963949B2 (en) 2012-06-28 2018-05-08 Carbon Energy Limited Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification
US9976403B2 (en) 2012-06-28 2018-05-22 Carbon Energy Limited Method for shortening an injection pipe for underground coal gasification
RU2522785C1 (ru) * 2012-10-26 2014-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тульский государственный университет" (ТулГУ) Способ подземной газификации тонких и средней мощности пластов бурого угля
CN104088617A (zh) * 2014-06-24 2014-10-08 新奥气化采煤有限公司 一种煤炭地下气化进、出气孔结构
CN104088588A (zh) * 2014-06-24 2014-10-08 新奥气化采煤有限公司 一种煤炭地下气化用套管及煤炭地下气化进、出气孔结构
RU2678246C1 (ru) * 2017-07-25 2019-01-24 Федеральное государственное бюджетное учреждение науки Институт горного дела Севера им. Н.В. Черского Сибирского отделения Российской академии наук Способ подземной газификации угля в условиях криолитозоны

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