WO2015053731A1 - Method for underground gasification of a hydrocarbon-containing formation - Google Patents

Method for underground gasification of a hydrocarbon-containing formation Download PDF

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WO2015053731A1
WO2015053731A1 PCT/UA2014/000036 UA2014000036W WO2015053731A1 WO 2015053731 A1 WO2015053731 A1 WO 2015053731A1 UA 2014000036 W UA2014000036 W UA 2014000036W WO 2015053731 A1 WO2015053731 A1 WO 2015053731A1
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electrodes
formation
heating
horizontal
wells
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PCT/UA2014/000036
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Russian (ru)
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}s}µ}Æ}w}n}¸}ª}ƌ€}Ý}©Jc}¢JØ}©€}°}¨}¢Jb}´}|Jð}§}¥}½Jg
Эдуард Анатольевич ТРОЦЕНКО
}y}k}°}µ}w}æ}°}¸Œ€}º}§}´}¨}½}©€}®}¬}´}¥}|}§}¥}½Jg€
Леонид Яковлевич ШВАРЦМАН
}j}°}o}n}¸}Æ}kŒ€}n}¥}·}§}¨}½}¾€}k}¢Ja}½}|Jð}§}¥}½Jg
Евгений Васильевич БАЖЕНОВ
}~}s}t}m}n}¸}®}ªŒ€}k}¢Ja}½}|}½}¾€}q}¥}¢}¨}´}¥}½Jg€
Василий Иванович СТУДЕНЯК
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}s}µ}Æ}w}n}¸}ª}ƌ€}Ý}©Jc}¢JØ}©€}°}¨}¢Jb}´}|Jð}§}¥}½Jg
}y}k}°}µ}w}æ}°}¸Œ€}º}§}´}¨}½}©€}®}¬}´}¥}|}§}¥}½Jg€
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Publication of WO2015053731A1 publication Critical patent/WO2015053731A1/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2401Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity

Abstract

The invention relates to methods for gasifying hydrocarbons. The present method involves drilling at least two production wells, having vertical-horizontal bores which pass through an underground formation, and at least one gas extraction well, positioning electrodes in the vertical-horizontal wellbores, heating the formation, producing a vapor/gas mixture and extracting same via the gas extraction well. The present invention is novel in that the formation is heated in consecutive thermo-zoned areas; the first area is heated by applying voltage to two electrodes which are positioned in horizontal wellbores; the formation of an electric arc is initiated between said electrodes and is maintained until a thermal breakdown in the inter-electrode zone of the well surface layer is produced and a resistance heating channel is formed between the electrodes in said layer. Subsequent areas of the formation are heated by adjusting the strength of the current fed to the electrodes while simultaneously oppositely displacing the electrodes within the horizontal wellbores at a rate of 1.0-2.5 meters per day. The technical result consists in increasing the specific yield of the produced vapor/gas mixture.

Description

A method of underground gasification of a hydrocarbon containing formation

TECHNICAL FIELD

The technical solution relates to methods of treating a subterranean formation to convert organic matter into hydrocarbons is recovered as a gaseous mixture, and is designed to produce hydrocarbons from the rocks having a significant content of organic solids in the form of kerogen - for example, oil shale.

BACKGROUND ART

Oil shale contains organic matter - kerogen, interspersed in the form of nodules with a diameter of 20 - 140 microns in mineral limestone or other mineral structure. fossil energy capacity value determined rocks depends on the concentration of kerogen, which is from 5% to 65% by weight. Efficiency of industrial development is determined by the possibility of obtaining gaseous and liquid energy carriers such as gas oil shale, shale oil having a high calorific value and high value as a chemical feedstock. Development of a depth of field of fossil deeper reservoir 50 m uneconomic due to high costs both in the shaft and open at the development and subsequent transportation to the place of processing large volumes of raw materials, including gangue. High disposal costs are considerable volumes of waste ground processing of fossil fuel. Methods of processing minerals in situ, underground, can reduce costs, increase profitability of production of valuable energy. Economically promising is the pyrolysis of oil shale - heat treatment method fossil without oxygen, in which for a given mode are heated to a predetermined temperature and carried thermostatic exposure to fully complete pyrolytic decomposition processes in hot shale volume.

The closest the technical essence and achieved result of the claimed technical solution is the method of underground gasification of a hydrocarbon containing formation (see RF patent ^ '2,349,745, the application:. 2006101868/03 from 14.04.2004, US 60/511 priority 994 of 16.10.2003, published . 20.03.2009) comprising drilling at least two wells with horizontal holes vertically extending in the subterranean formation, and at least one flue hole placement in the vertically-horizontal shafts wells electrodes, heating in the formation, obtaining the gas-vapor mixture and removing it through the vent hole.

In the known method create at least one fracture which intersects the at least one or at least two production wells are placed a conductive material in the gap, contacting the two electrodes with an electrically conductive material, a voltage is applied to the two electrodes for passing an electric current through the gap so that an electric current flows, at least a portion of conductive material and this generates sufficient thermal energy for the pyrolysis, at least a portion of organic matter in the recoverable hydrocarbons.

The gap may be horizontal, vertical or inclined with respect to the wellbore from which it was created. The conductive material may comprise a proppant, such as a conductive cement. The conductive material is used as a resistive heater. Electric current passes through the resistive heater, consisting of an electrically conductive material, wherein the electric power is converted into thermal energy, and this energy is transferred to the heat transfer layer.

In the known method the electric heating is performed rock containing significant amounts of organic substances. Acting in place the electric heater is created by introducing a conductive material in the gap in the layer containing the organic substances is conducted where the so-called "hydraulic fracturing".

In the known method the allocation of sufficient heat energy for the pyrolysis is carried out due to the electrical resistivity of the electrically conductive material, which is associated with a lot of preparatory works, consisting in the creation of the fracture and placing a conductive material in the gap. This gives rise to great dielectric and resistive losses in the formation.

A disadvantage of the known method is the low specific yield of the resulting gas mixture and high energy process, and low workability of the production process. SUMMARY OF THE iNVENTION

The basis of the invention is to improve the method for a hydrocarbon containing formation underground gasification by introducing new operations, new modes of implementation, which leads to higher specific yield obtained gas mixture and reduce the unit cost, and enhances of processability manufacturing process by simplifying the process of gasification, reduction economic costs of gasification preparation while increasing the reservoir heating intensity.

The problem is solved in that in a method of underground gasification of a hydrocarbon containing formation, comprising drilling at least two wells with horizontal holes vertically extending in the subterranean formation, and at least one flue hole placement in the vertically-horizontal shafts wells electrode, heating of the formation, obtaining the gas-vapor mixture and removing it through the vent hole, on a n s m according to the technical solution is the fact that the reservoir heating ved ut successive termozonirovannymi portions, the first termozonirovanny portion heated application voltage to the placed in horizontal production wellbore two electrodes between which initiated creation of the electric arc to produce a transconductance zone thermal breakdown in the surface layer of the well and forming therein a channel resistance heating between electrodes, and heating formation in subsequent sections are termozonirovannyh current regulation on the electrodes while opposed m moving electrodes in horizontal trunks wells at 1, 0-2.5 m / d, the monitor physicochemical parameters output vapor-gas mixture, and the parameters of the current load on the electrodes.

What is new is the fact that the electrodes supplied current of more than 80 A.

What is new is the fact that heating of the formation are steps, wherein each step movement of the electrodes produced while reducing the volume of withdrawn vapor mixture is 10-20%.

What is new is the fact that all of the horizontal production wellbore extending into a subterranean formation, located in one plane symmetrically in pairs.

The causal relationship between the set of essential features of the method and achieved technical result is as follows.

The fact that in the process of hydrocarbon containing formation underground gasification:

- heating of the formation are consistent termozonirovannymi areas;

- the first portion is heated termozonirovanny application voltage to the placed in horizontal wells trunks two electrodes between which an electric arc is initiated establishment to obtain a transconductance of thermal breakdown zone in the surface layer of the well and, therefore, the formation of the channel therein resistance heating between electrodes;

- and subsequent heating of the formation at sites are termozonirovannyh current regulation on the electrodes while moving the electrode in the opposed horizontal production wellbore at a speed of 1.0-2.5 m / day;

- wherein the control is carried out physicochemical parameters of output vapor-gas mixture and parameters of the current load on the electrodes;

together with the known features provides increased specific yield obtained gas mixture and the reduction of unit costs, and also contributes to the processability of the manufacturing process by simplifying the process of gasification, to reduce the economic costs of gasification preparation while increasing the intensity of the heating layer.

The reason is as follows.

Termozonirovanny first portion is heated by applying a voltage to horizontal shafts placed into wells two electrodes. Between the electrodes creating an electric arc is initiated, the heating begins termozonirovannogo portion until the thermal breakdown within the formation in the surface layer of the well manifested rapid increase of current between the electrodes, and forming the surface layer of the well channel resistance heating between electrodes. When thermal breakdown in the surface layer of the well occurs by thermal shock of organic microparticles, which leads to a microburst and intensive crack formation, and this, in turn, increases permeability of the formation. Via resistance heating, formed in the surface layer of the well, the current flows parallel to create an electric arc arc interelectrode channel, and it further leads to extinguishing the arc therebetween and closure of the arc discharge from electrodes exclusively formed by the conductive surface of the wellbore and a further resistive heating of the formation. In this region due to the penetration of the heating channel having a higher temperature, into the formation increases the intensity of the heating reservoir and intensifies process of pyrolytic decomposition, respectively, reduced unit costs and increases the specific yield of the resulting gas mixture.

Heating of the formation in subsequent sections are termozonirovannyh regulation of current to the electrodes while moving the opposed electrodes used in horizontal production wellbore at a rate of 1.0-2.5 meters / day. When this control is performed physicochemical parameters output vapor-gas mixture, and the parameters of the current load on the electrodes.

Thus, heat is not subjected to the whole layer located between the production wells and termozonirovanny portion in which the electrode is formed in the surface layer of the well resistance heating channel. This removes excess heat losses in the massif from a prolonged heating the entire formation, as occurs in the method - the prior art, reduces the time of receipt of the desired product - the gas-vapor mixture intensifies the process of pyrolytic decomposition minimizes generating capacity power source, respectively, reduced unit costs and improved specific output the obtained vapor mixture.

What carried direct heating termozonirovannogo portion of the formation by passing directly from the current thereto, and as the heat generating channel uses a limited surface layer of the well, which produce thermal runaway and generating resistive heating channel eliminates the need for the conductive material to create a heat-generating channels, their introduction and installation of wells, as is done in the way - the prototype, as well as intensify the process of pyrolytic decomposition, and, respectively, -retarded, reduced unit costs and increases the specific yield of the resulting gas mixture.

That the heating of the formation is initiated by creation of the electric arc voltage is applied to two electrodes placed in the trunks of the two horizontal wells, it provides the realization of the principle of pulse-dosed thermal influence on termozonirovanny portion. In this case the heating mode is changed by the non specific electrical resistance of the current thermal power feeding from the power supply. Therefore, the heating layer are, moving the opposing electrodes in the two horizontal shafts wells at a rate 1.0- 2.5 m / day, and simultaneously monitor physicochemical parameters derived gas mixture parameters and current load on the electrodes.

This embodiment of the method leads to higher specific yield obtained gas mixture and the reduction of unit costs, and also contributes to the processability of the production process.

It was established experimentally that the simultaneous opposed displacement of the electrodes in horizontal production wellbore at a rate of 1.0-2.5 meters / day is optimal for increasing the specific output the resulting gas mixture, and reducing the unit cost, but also improves workability of the production process.

That is supplied to the electrodes a current of 80 A, is also experimentally established the optimal mode of the claimed method provides improved specific output the resulting gas mixture, and reducing the unit cost, which increases processability of the production process.

That the heating of the formation are steps, wherein each step movement of the electrodes produced while reducing the current values ​​of the volume withdrawn vapor mixture is 10-20%, eliminates unproductive heating termozonirovannogo portion shale formation, where the pyrolysis reaction have passed in full. This intensifies process of pyrolysis and correspondingly reduce the cost and specific heat leads to higher specific yield the resulting gas mixture and also improves workability of production by simplifying the process of gasification, to reduce the economic costs of preparing the gasification while increasing the intensity of the heating layer.

The fact that all trunks horizontal wells extending into a subterranean formation, are coplanar in pairs symmetrically preparation technology simplifies the horizontal portion of the wellbore and to optimize the formation of the surface layer of the well channel resistance heating, resistive heating further accelerates shock formation. Horizontal production wellbore extending into a subterranean formation, remain free during the whole period of the process, being the drain system elements. Thus on termozonirovannom portion increases the speed of the process due to pyrolysis of creating the best conditions of evacuation of the reaction products, which leads to higher specific yield obtained of the gas mixture and reduce the unit cost, and enhances adaptability of the production process

All the technical solutions claimed signs together lead to higher specific yield obtained gas mixture and reduce the unit cost, but also contribute to technological manufacturing process by simplifying the process of gasification, to reduce the economic costs of the gasification process while simultaneously increasing the intensity of the heating layer. BRIEF DESCRIPTION OF DRAWINGS

Essence of the technical solution is illustrated by drawings, where

- Figure 1 shows a functional diagram of a method of underground gasification of a hydrocarbon containing formation;

- Figure 2 shows a diagram of initial creation termozonirovannogo portion;

- at fig.Z diagram termozonirovannogo portion formed in a mode of resistance heating oil shale formation;

- Figure 4 shows a diagram of the thermal field and parameters termozonirovannogo portion formed in the mode of resistance heating oil shale formation;

- Figure 5 shows a diagram of the low power processing oil shale formation, where A - insertion direction of the electrode; The - direction of movement of the electrode process;

- Figure 6 shows a diagram of an industrial implementation of the method of underground gasification of a hydrocarbon containing formation.

underground gasification process includes drilling wells ground surface 1 with a vertically-horizontal shafts 2, 3, respectively, extending in the treated interval in a subterranean formation 4, a solid fossil fuel and placing them inside the electrodes 5 are connected by cables to a power source ground. To reduce the dispersion of energy into the surrounding space loss electrode 5 disposed under the scheme of the spatial arrangement for maximum density of the thermal field in the central region of the conductive layer for forming a channel therein resistance heating. When the electrodes 5 are arranged in horizontal shafts 3. The resulting vapor-gas mixture was fed through the borehole 6. The exhaust gas control of physicochemical parameters derived th gas mixture is carried out by sensors 7 mounted at the output 6 of the flue hole (at the surface) and at the inlet a vent hole 6 (within the formation). current load parameters measured at the sensor electrodes 5 8. The heating reservoir are termozonirovannymi successive portions 9.

Best Embodiment

In practice a method of underground gasification is carried out as follows.

Analyze geological data on the location, depth of fossil formation, analysis of its physical and chemical characteristics and the technical and economic assessment and take a decision on the placement of wells bush - as a structural element of the system under development wells in the field. wells bush consists of one or more central flue hole 6 and two or more wells 1. FIG. 1 is a block diagram of a method of underground gasification of a hydrocarbon containing formation.

Vertical shafts drilled production wells 1 2, extending in the intended termozonirovanny to the initial heating portion 9 in the subterranean formation, and flue gas exhaust hole 6. The hole 6 is intended to evacuate the surface produced during the pyrolysis of gasified hydrocarbons - gas mixture. The drilling depth is determined by the depth of the oil shale formation. The diameter of the flue hole 6 is 350-450 mm.

Drilling horizontal wells produce three wells 1 for introduction into the formation of the electrodes 5 extending in termozonirovanny portion 9 in the subterranean formation. The start point of drilling the production well spaced from one flue hole 6 along the direction of the calculated formation treatment. Distance between wells (from 10 m to 100 m or more) specified data calculation process. The diameter of the production well 1 - from 50 mm to 550 mm. Horizontal wells stems 3 1 extending in a subterranean formation are coplanar in pairs symmetrically.

Docking an operate flue 6 wells and production wells 1, thereby forming the well bore defining the direction of formation processing. Wells sboyka point defined as the point of initial heating and start forming the first portion 9 termozonirovannogo.

After production wells 1 administered electrodes 5 and move them on the horizontal shaft 3 formed to the point of initial heating and start forming the first portion 9 termozonirovannogo.

Charge-displacement electrodes 5 by vertical trunks 2 and on the horizontal shaft 3 wells 1 to the point of initial heating and start forming the first termozonirovannogo portion 9 is carried out by any of known methods, for example by pushing excess air pressure electrodes 5, equipped with the so-called "skirt" construction of a flexible strong material (rubber, canvas, etc.), closing gaps between the electrode body 5 and the walls of the well 1. The electrodes 5 shall be sent by the horizontal trunks 3 wells 1 to junction point with flue bore 6. "skirt" design burns on initial heating termozonirovannogo portion 9 and does not prevent subsequent movement of the electrode 5 on the horizontal shaft 3 wells 1.

After placing the electrode 5 at the initial heating portion 9 operate termozonirovannogo sealing wells at 1 packers set fossil formation.

After completion of the preparatory operations produce elektrosboyku wells 1 by ignition of the arc between the electrodes by any of the known methods (high-voltage pulse by high-frequency electric discharge from the oscillator, etc.) and perform an initial heating termozonirovannogo portion 9 in the formation shale. The occurrence of the arc is fixed considerable rapid increase of electric power to the electrodes 5. Combustion lighted electric arc is stabilized by stabilizing current at a predetermined level (80 A). Shaped arc rapidly heats the inter-electrode space.

Received arc state is maintained for several hours in order to heat the surface of horizontal shafts 3 wells termozonirovannom 1 on the first portion 9 to a temperature of 700 - 900 ° C in the surface layer of horizontal shafts 3 wells 1. As a result, the occurrence of thermal breakdown on reaching these temperatures for surface horizontal wells 3 wells 1 formed conductor layer shale - shale resistivity of the surface layer falls d m values ​​of 100 ohms (at 700 ° C) and 0.025 ohm m (at 900 ° C).

Power redistribution occurs between the electric arc in the interelectrode space and the channel resistance heating horizontal shafts 5 between electrodes 3 operating boreholes 1 which is formed by the thermal breakdown. This creates conditions "Swapping" of the electric arc from the electrodes 5 on the wall of operating horizontal shafts 3 boreholes 1 and the formation of conductive channels in the formation "electrode duga- horizontal wellbore wall-arc-electrode" and "contact-electrode-transition horizontal wellbore wall -contacts perehoda- electrode ", which form the resistive heating channel between the electrodes 5. The appearance of the conductive layer is fixed on the electrodes drop power realizable in the current stabilization mode.

"Arc" component in the formed channel resistance heating remains constant due to the constant distance between the electrode 5 and the horizontal wellbore wall 3 production wellbore 1.

Completion preheating termozonirovannogo first portion 9 occurs with the formation of the channel therein resistance heating between electrodes in the surface layer of horizontal wellbores 3 operating boreholes 1.

The duration of the primary heating portion 9 termozonirovannogo volume from 0.1 to 1 m 3 of a few hours, depending on the selected dimensions termozonirovannogo portion 9 and the electric mode selections.

Next, a further dilution is performed electrodes 5 in stabilizing the power mode.

High temperature (700 ° C to 900 ° C) over the surface of the conductive channel horizontal wellbores walls 3 wells 1 - channel resistance heating between electrodes, the reservoir provides heating oil shale to a temperature (460-490 ° C at the boundary layer of shale) sufficient to of the process of pyrolytic decomposition of oil shale in the entire volume termozonirovannogo portion 9. The process of pyrolytic decomposition of oil shale results in the creation of gasified hydrocarbons in admixture with hydrogen, carbon monoxide, steam - so yvaemoy vapor mixture, which is the target product of the process. An indication of completion of the formation termozonirovannogo portion 9 serves as a sharp drop in the evacuated volume and pressure the gas-vapor mixture in the flue hole 6 in particular, the volume output of the gas mixture is reduced by 10-20%. This means that the temperature limits termozonirovannogo portion 9 of the pyrolysis process is completed, the organic matter in this local area is completely decomposed.

No clear boundaries distribution thermal field termozonirovannogo portion 9 when processing reservoir in open unlimited massif leads to the fact that a plurality of processes run parallel, from sequential heating of oil shale at a temperature of its natural occurrence in the array to a predetermined temperature value in termozonirovannom portion 9, ending the processes of evaporation of volatile pyrolytic reactions and decomposition of kerogen.

Figure 2. is a diagram of the initial formation termozonirovannogo portion, and fig.Z diagram termozonirovannogo portion formed in the resistive heating mode shale formation.

Scheme thermal field and parameters termozonirovannogo portion formed in the mode of resistance heating oil shale formation is shown in Figure 4.

To streamline lead termozonirovannymi successive portions 9 along the horizontal wells 3 wells in time occurring processes heating of the reservoir 1. This is diluted in opposite directions electrodes 5 on the horizontal shaft 3 of two wells from one point at the initial heating flue hole 6 towards the exit of the horizontal shafts 3. Such movement of the electrode 5 at the optimum speed provides controlled and consistent development processes shift - n agrev fossil, evaporation, separation of volatile decomposition of organic fraction (kerogen), formation termobituma, sublimation shale tar and char formation.

The optimum speed of the electrodes 5 in the horizontal shaft 3 is set empirically and is 1, 0 to 2.5 m / day.

The table shows the data obtained in the tests of different moving velocities of the electrodes 5.

Efficiency flue gas wells is determined in percentage as a ratio of the actual flow rate to the production rate of the well flue optimal. Control physicochemical parameters derived gas mixture 7 is carried out by sensors mounted on the outlet and inlet flue hole 6. The current load parameters measured at the electrodes 5 8. The temperature sensors gas mixture at the outlet of flue hole 6 should be at least 200 - 210 ° C , entering the vent hole 6 should be at least 220 - 260 ° C.

At a temperature of the gas-vapor mixture at the outlet flue hole 6 is determined temperature termozonirovannom portion of the border area, operate the adjustment speed of movement of the electrodes 5 in order to increase the production rate of the well 6 to flue gas mixture. Table.

Figure imgf000019_0001
capacities

formation GS 2m

9 2.75 0,5-1, 0 45-50 65-85 For variable

seam thickness GS 1m

10 2.75 0.7-1.4 180-200 35-85 For

variable power

formation GS 2m

As can be seen from the data shown in Table 5 dilution of the electrodes at a rate less than the optimum (Examples 1 and 2) leads to poor performance of the process gas mixture due to the fact that the layer is heated, wherein the fuel component no longer remains.

Stud electrodes 5 at a rate more than optimal (examples 9, 10) leads to the formation of residues in the rock kerogen and unreacted fuel outlet fall due to the fact that there are still combustible components in the formation and termozonirovanny portion already traveled.

The optimum speed of the electrodes 5 in the horizontal shafts 3 is 1, 0-2,5 m / day.

The resulting pyrolysis gas-vapor mixture is evacuated through the vent hole 6 in the ground energo complex for subsequent processing.

Each subsequent step of moving the electrodes produced while reducing the volume of withdrawn gas mixture at 10- 20%.

In the course of the process is the development of channels of flue system. The first factor in the development system is the release of flue segments wells between the end electrode 5 being in termozonirovannom portion 9 and flue bore 6 is termozonirovannogo portion 9. The second factor propagation inside the boundary of the pyrolysis process termozonirovannogo portion 9 is the formation of microchannels of 20 - 140 microns by the decomposition of the kerogen in the pores of the structure formed by minerals. Both factors contribute to the activation of the pyrolysis process due to the decrease of the partial pressure of reaction products in termozonirovannom portion 9. From the data obtained the temperature build graphics measured at the inlet vent hole 6, depending on the distance termozonirovannogo portion 9 from the flue hole 6. The cooling gas mixture is a sign of the end of the process.

When moving termozonirovannogo portion 9 at a considerable distance from the initial position of the flue hole 6, lowering the steam-gas mixture temperature is significant, and at a certain distance therebetween temperature vapor mixture entering the vent hole 6 is below the condensation temperature of high-boiling heavy fractions of shale oil (160 - 1900 FROM). The pyrolysis process should be completed when the temperature vapor mixture entering the vent hole 6 to 200 - 220 ° C, to prevent condensation of gasified viscous hydrocarbons.

The low-temperature pyrolysis of the dynamics of the thermal regime, heat-treated mineral composition close to the firing pottery ceramic technology (550-900 ° C), which leads to important environmental Corollary - conservation volumetric subterranean rock mass structure.

Number of gas mixture emitted depends on the speed of the electrodes 5, given by the temperature, the actual characteristics of shale and the conditions of the process (thermal power boiler and the depth of the layer).

To increase the well production by the steam-gas mixture on one vent hole 6 may be loaded with several wells 1 arranged around the flue hole 6 according to a scheme determined by the geometry of fossil formation. two production wells in line 1 from different sides flue hole 6, the four production wells 1 in cross-crossing in flue hole 6, the production wells may be located 1 may be arranged in radiation pattern centered on the flue hole 6, etc.

One possible industrial embodiment of the method shown in FIG. 5, where the processing circuit is a low-power shale formation, wherein A - insertion direction of the electrode; The - direction of movement of the electrode process. FIG. 6 is a diagram of industrial implementation of the method of underground gasification of a hydrocarbon containing formation.

industrial applicability

Industrial Applicability The claimed method is evidenced the possibility of its use on an industrial standard equipment.

Claims

Claim
1. A method for underground gasification of a hydrocarbon containing formation, comprising drilling at least two wells with horizontal holes vertically extending in the subterranean formation, and at least one flue hole, placing in the horizontal shafts vertically wells electrodes, heating formation, obtaining the gas-vapor mixture and removing it through the vent hole, characterized in that the heating layer are termozonirovannymi successive portions, a first termozonirovan ny portion is heated by applying a voltage to the placed in horizontal production wellbore two electrodes between which initiated creation of the electric arc to produce a transconductance zone thermal breakdown in the surface layer of the well and forming therein a channel resistance heating between electrodes, and heating of the formation in subsequent termozonirovannyh sites are adjusting the current to the electrodes while moving the electrode opposed to operating horizontal shafts HP well yn at 1, 0-2.5 m / d, the monitor physicochemical parameters output vapor-gas mixture, and the parameters of the current load on the electrodes.
2. The method of claim. 1, characterized in that the current supplied to the electrodes 80 a force A.
3. The method of claim. 1 and 2, characterized in that the heating layer are steps, wherein each step movement of the electrodes produced while reducing the volume of withdrawn vapor mixture is 10-20%.
4. The method of claim. 1, 2, 3, characterized schiysya that all trunks horizontal wells extending into a subterranean formation, are coplanar in pairs symmetrically.
PCT/UA2014/000036 2013-10-07 2014-03-24 Method for underground gasification of a hydrocarbon-containing formation WO2015053731A1 (en)

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RU2671880C1 (en) * 2017-05-18 2018-11-07 Владимир Георгиевич Кирячек Method of extraction of oil-kerogen containing reservoirs and technological complex for its implementation
WO2018212674A1 (en) * 2017-05-18 2018-11-22 Владимир Георгиевич КИРЯЧЕК Method of deriving hydrocarbons from oil-prone kerogen-rich formations and technological complex.

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