EP2633153A1

EP2633153A1 - Process for the in situ extraction of bitumen or ultraheavy oil from oil sand deposits as reservoir

Info

Publication number: EP2633153A1
Application number: EP11770719.0A
Authority: EP
Inventors: Dirk Diehl
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2010-09-28
Filing date: 2011-09-28
Publication date: 2013-09-04
Anticipated expiration: 2031-09-28
Also published as: CA2812711C; EP2633153B1; DE102010043302A1; WO2012041877A1; CA2812711A1

Abstract

The present invention relates to a process for the in situ extraction of bitumen or ultraheavy oil from oil sand deposits (100) as reservoir (1). The reservoir (1) is inductively heated by means of at least one electrical current-passing conductor (3) in order to achieve a reduction in the viscosity of the bitumen or ultraheavy oil. At least one perforated fluid guide (30), which surrounds or encloses the at least one conductor (3) at least in certain portions, is used to introduce a fluid (45) into the reservoir (1) via the perforation in the fluid guide (30). The fluid (45) reduces an electrical conductivity in the reservoir (1), at least in the surroundings of the fluid guide (30).

Description

description

Process for "in situ" production of bitumen or heavy oil from oil sands deposits as a reservoir

The present invention relates to a method of "in situ" production of bitumen or heavy oil from oil sands deposits as a reservoir. The reservoir is inductively heated via at least one electrical current-carrying conductor to achieve a reduction in the viscosity of the bitumen or heavy oil. A fluid is introduced into the reservoir via the perforation in the fluid guide via at least one perforated fluid guide which surrounds or comprises the at least one conductor at least in sections.

For the extraction of hydrocarbons such as heavy oils or bitumen from storage sites with oil sands or oil shale deposits, hereinafter referred to as reservoir, open pit methods or "in-situ" methods can be used. An "in-situ" Me ^¬ Thode is the SAGD (Steam Assisted Gravity Drainage) method. In this case, water vapor is introduced through a tube under high pressure into the soil through a pipe running horizontally within the reservoir. The steam heats the heavy oil or bitumen in the reservoir, making it flowable. The heated, flowable heavy oil or bitumen seeps over gravity to a second, for example, about 5 m deeper pipe through which it is pumped or promoted.

Alternatively or supportively, the reservoir can be heated inductively, for example by an insulated, current-carrying conductor loop, which induces currents in the environment of the reservoir in its environment. The induced currents are mainly carried by the ionic conductivity in liquids. The amount of magnetic flux density around the conductor of the conductor loop decreases approximately inversely proportional to the distance to the conductor. With homogeneous electrical conductivity of the surrounding soil this leads approximately a decrease in the heating power density around the conductor. The heating power density around the conductor is inversely proportional to the square of the distance from the conductor. Thus, the highest heating power occurs in the immediate ^¬ Barer environment for insulated conductors tung dense on. This initially results in a strong Erwär ^¬ tion of the soil in the immediate vicinity of conductors, leading by conduction and to a correspondingly high temperature T _L of the conductor itself. This happens even if the ohmic losses in the conductor itself are very small.

The conductor for inductive heating of the reservoir, which is also called inductor and is known for example from DE 102007040605 B3, consists of a number of materials. Ins ^¬ special use pensation in the conductor dielectrics for capacitive com- to keep electrical losses in the conductor itself as low as possible. For insulating the electrically conductive material, in particular with respect to the surrounding soil, insulating material is used, which consists for example of PFA, PTFE and / or PEEK or includes this or contains. The dielectric and the insulating material are usually thermally stable up to a maximum of 150 ° C, even over long periods such as hours, days, months and years away.

To heavy oil to promote bitumen and / or the temperature of the conductor to be kept below a critical temperature of eg 150 ° C for extended periods reliably supported by inductive heating of the reservoir via at least one Lei ^¬ terschleife insulated electric conductors must. The only way to ensure the advertising that the insulation and dielectric are thermally stable over time and the circuit will not be damaged by high tempera ^¬ ren. This is difficult, especially with regard to the ^high electrical voltages of greater than 10 kV and heat outputs in the range of MW.

Object of the present invention is therefore to provide a method in which the temperature of a conductor for inductive heating of the soil of a reservoir does not exceed a critical value.

The stated object is achieved with respect to the method for the "in situ" production of bitumen or heavy oil from oil sands deposits as a reservoir having the features of claim 1.

Advantageous embodiments of the inventive method for "in situ" promotion of bitumen or heavy oil from oil sand deposits as a reservoir are apparent from the associated dependent claims. The features of the main claim with the features of the dependent claims and notices can ^¬ male of the dependent claims with each other are combined.

The inventive method for "in situ" promotion of bitumen or heavy oil from oil sands reservoirs as a reservoir, that the reservoir is inductively heated via at least one electric current-carrying conductor to reduce the viscosity of the bitumen or heavy oil, and that at least one perforated fluid guide which at least partially surrounds or comprises the at least one conductor, a fluid is introduced into the reservoir via the Perforie ^¬ tion in the fluid guide. The fluid reduces electrical conductivity in the reservoir, at least in the vicinity of the fluid guide and / or the conductor. That the conductor and the fluid guide themselves are arranged adjacent and eg are surrounded is include to the conductor at least in sections, among other ^¬ rem to understand which has the same and / or the same perforation as the fluid guide by a common insulation against the ground, or is at least partially permeable to fluids.

By reducing the electrical conductivity in the vicinity of the fluid guide, the current induced by the current-carrying conductor in the vicinity of the fluid guide or of the conductor is reduced. As a result, the inductively generated heating power in the vicinity of the conductor or the fluid guide Reduced and the temperature of the conductor or the Fluid idführung, in particular by heat conduction of inductively generated heat in the immediate vicinity, is limited.

As the fluid, water of low conductivity, as the conductivity of water in the reservoir, can be introduced into the reservoir. The amount of water introduced and / or its conductivity should be determined depending on the value at which the temperature T _{L is to be} limited, and in particular depending on the current / voltage used for induction through the conductor.

Alternatively or additionally, gas can be introduced into the reservoir as fluid. Here, air is particularly kos ^{¬-effectively} and easy to use as a gas. However, carbon dioxide and / or nitrogen may also be used as the gas, or the gas may comprise carbon dioxide and / or nitrogen.

As a fluid, a solution of chemical substances in the reservoir can be introduced, the chemical substances react to a sparingly soluble salt in the reservoir and thereby lead to precipitation of ions in the reservoir. It is advantageous if a chemical analysis is carried out before introducing the solution into the reservoir. At least one fluid, in particular water, may be used from the reservoir to determine ions in the fluid withdrawn from the reservoir and to select the chemicals in the solution depending on the particular ions. Concentration determinations can also help to create the correct composition of the solution, with which the temperature of the direct environment of the conductor and thus of the conductor can be kept at a predetermined value or below a limit even with a certain energization of the conductors. The concentration and type of ions in the solution should cause the solution to precipitate ions in the reservoir, for example in the form of a sparingly soluble salt, and thus the total ion concentration of the freely mobile, charged and thus inductively via the current is passed through conductor movable ions is reduced to a value which leads to a predetermined temperature and temperature T _L in its direct environment with a predetermined structure and energization of the conductor. By reducing the electrical conductivity in the reservoir, the inductive heating is reduced via the current-carrying conductor.

The temperature T in the direct or indirect environment of the conductor and / or the fluid guide can be limited to a maximum value, in particular to a value less than 150 ° C. In this case, a previously described fluid introduction into the reservoir or a combination of the types of fluid introduction described above can be used. The temperature can be limited to a maximum value at which components of a device for "in situ" extraction of bitumen or heavy oil from oil sands deposits as a reservoir, in particular insulating materials of the conductor, dielectrics Zvi ^¬ rule conductor components and / or materials of the fluid guide, are temperature stable. At a temperature of less than 150 ° C materials such as dielectrics and insulating materials, such as PFA, PTFE and / or PEEK are usually thermally stable and will not be thermally damaged over time. This avoids damage to the conductor caused by high temperatures in its direct environment by keeping the temperatures below a limit.

The fluid can reduce the electrical conductivity in the vicinity of the fluid guide, in particular in the region of 3 m around the fluid guide. This may be sufficient to reduce the heat transported through the environment by thermal conductivity to the conductor so as to prevent that the temperature T _{L of} the conductor does not exceed a critical limit for inductive heating of the conductor environment.

The electrical conductor may be of an alternating current with a current in the range of more than 100 A, in particular 270 A, and / or with a frequency in the range of 10 kHz to 100 kHz, in particular 75 kHz, are flowed through, whereby in particular the soil of the reservoir in the vicinity of the electrical conductor is heated by induced currents in the ground. In this case, a heating power in the range of several MW can be generated at voltages across the electrical conductor in the range of greater than 10 KV. Other values are possible, in particular depending on the design of the conductor, the nature of the soil, the heavy oil or bitumen to be transported and other parameters involved in oil production via inductive heating.

Preferred embodiments of the invention with advantageous developments according to the features of the dependent claims are explained in more detail below with reference to the figures, but without being limited thereto.

It is shown in the figures:

FIG. 1 shows a section through an oil sand reservoir 100 with injection 101 and delivery pipe 102,

FIG. 2 shows a perspective detail of an oil sand reservoir 1 with an electrical conductor loop 2 running horizontally in the reservoir,

3 shows a perforated, tubular conductor 3 with integrated capacitors and a device for the introduction of electrolytes.

In Figures 1 and 2, an oil sand deposit designated as a reservoir 100 is shown, wherein for the further Be ^¬ tions always a cuboid unit 1 with the length 1, the width w and the height h is taken out. The length 1 may for example be up to some 500 m, the width w 60 to 100 m and the height h about 20 to 100 m. It has to be taken into account that starting from the earth's surface E there can be an overburden of thickness s up to 500 m. In realization of the SAGD method 100, the reservoir is an in ektionsrohr 101 available for steam or water / steam mixture, and a delivery pipe 102 for the liquefied bitumen or oil according to figure 1 in ^¬ be known manner in the oil sand reservoir.

FIG. 2 shows a known arrangement for inductive heating. This can be gebil ^¬ det by a long, ie some 100 m to 1.5 km, laid in the ground conductor loop 10 to 20, wherein the forward conductor 10 and return conductor 20 side by side, ie at the same depth, are guided and at the end via an element 15 within or partially outside the reservoir 100 are interconnected. Initially, the conductors 10 and 20 are led down vertically or at a shallow angle and are powered by an RF generator 60 which may be housed in an external housing. In particular, the conductors 10 and 20 extend at the same depth next to each other, but possibly also one above the other.

Typical distances between the return and return conductors 10, 20 are 5 to 60 m with an outer diameter of the conductors of 10 to 50 cm.

An electrical double line 10, 20 in Figure 2 with the aforementioned typical dimensions has a Längsinduktivitätsbelag of 1.0 to 2.7 μΗ / m. The Querkapazi- tätsbelag lies with the mentioned dimensions of only 10 to 100 pF / m, so that the capacitive parallel-path currents can be neglected first ver ^¬. In this wave effects are avoided to ver ^¬. The shaft speed is determined by the capacity and inductance coating of the conductor arrangement given. The cha ^¬ istic frequency of the arrangement is due to the loop length and the wave propagation velocity ent ^¬ long the arrangement of the double line 10, 20. The loop length should therefore be selected so short that there are no troublefree ^¬ Governing ripple effects here.

It can be shown that the simulated power loss ^¬ density distribution to the conductors in a plane perpendicular - as it forms at anti-phase energization of the upper and lower conductor - decreasing radially.

A inductively heating capacity of 1 kW per meter double line at 50 kHz, a current amplitude of approximately 350 A for low reservoir with specific resistance is ^¬ supernatants of 30 Ω-m and about 950 A for high impedance reservoirs having specific resistances of 500 Ω- m needed. The required current amplitude for 1 kW / m falls quadratically with the excitation frequency, ie at 100 kHz the current amplitudes fall to 1/4 of the above values.

With an average current amplitude of 500 A at 50 kHz and a typical inductivity of 2 μΗ / m, the inductive voltage drop is about 300 V / m.

In order to limit the total inductive voltage drop across a conductor loop 2 to values of less than 100 kV in total, and in order to avoid insulation problems, the line inductance L is compensated in sections by discrete or continuous series capacitances C. Is individuality in the integrated in the line compensation, the frequency of the RF line generator must be tuned to the Re ^¬ sonanzfrequenz the current loop. This means that the double line 10, 20 can be operated expediently for heating purposes, ie with high current amplitudes, only at this frequency. As a result, an addition of the inductive voltages along the line is prevented. If in the above example - ie 500 A, 2 μΗ / m, 50 kHz and 300 V / m - for example, every 10 m each a capacitor d in the return conductor of 1 iF capacity introduced, the operation of this arrangement at 50 kHz resonantly done. Thus, the occurring inductive and correspondingly capacitive sum voltages are limited to 3 kV. Is the distance between adjacent capacitors d decreases, the capacitance values must increase inversely proportional to the distance - in proportion to the distance verrin ^¬ Gerter request to the withstand voltage of condensers ^¬ ren - to obtain the same resonant frequency.

An advantageous, as shown in Fig. 3 and known from the prior art disclosed embodiment, with the duct 2 integrated capacitors provides that the capacity of cylindrical capacitors Ci between a tubular outer electrode 32 of a portion I and a tubular inner ^¬ electrode 34 of section II is formed, between which a dielectric 33 is located. Likewise, the adjacent capacitor is formed between sections II and III.

For the dielectric of the capacitor C high temperature resistance, in addition to a ho ^¬ hen dielectric strength continues to demand, as the leader, is in the inductively heated reservoir 100, which can reach a temperature of eg 250 ° C and the resistive losses in the conductors 10 , 20 can lead to further heating of the electrodes. The requirements for the dielectric 33 are met by a large number of capacitor ceramics. For example, the group of aluminum silicates, ie porcelains, have temperature resistances of several 100 ° C. and electrical breakdown strengths of> 20 kV / mm at perivivities of 6. Thus, the above cylinder capacitors can be realized with the required capacity and have a length of, for example, 1 to 2 m.

If the overall length should be shorter, a nesting of several coaxial electrodes should be provided. This is not shown in the figures for the sake of simplicity.

Other conventional capacitor designs can also be integrated into the line as long as they have the required voltage and temperature resistance.

In FIG. 3, the entire electrode is already surrounded by insulation. The insulation against the surrounding soil is necessary to prevent resistive currents through the soil between the adjacent sections, in particular in the region of the capacitors. The insulation also prevents the resistive current flow between the return conductor and the return conductor. However, the requirements with respect to the dielectric strength to the insulation are compared to the uncompensated line of> 100 kV dropped in the above example, slightly above 3 kV and thus meet by a variety of insulating materials. Like the dielectric of the capacitors, the insulation must withstand higher temperatures permanently, which in turn offers ceramic insulating materials. The insulation layer ^thickness must not be too low ^¬ chosen, otherwise capacitive leakage currents could flow into the surrounding soil. Insulation thickness greater z. B. 2 mm are sufficient in the above embodiment.

It may be parallel ge ^¬ switched several rohförmige electrodes. Advantageously, the parallel connection of the capacitors can be used to increase the capacitance or to increase its dielectric strength. In an arrangement according to FIG. 3, according to the state of the art, partial introduction of electrolytes into the ground can be carried out for a targeted increase in the heating effect. For this purpose, the line 2 next to the compensated electrode on an insulated inner tube 40 with insulated outlet openings 41, 42 and 43, which is also referred to as perforated hereinafter. As a result, for example, water or an electrically conductive aqueous salt solution or other electrolytes can be introduced into the reservoir in order to increase the conductivity of the reservoir.

Furthermore, the introduced water can be used to cool the conductor. If the outlet openings are replaced by valves, the change in conductivity can take place temporally and spatially in sections.

Increasing the conductivity serves to increase the inductive heating effect without having to increase the current amplitude in the conductors.

In FIG. 3, the longitudinal inductance is compensated by means of predominantly concentrated transverse capacitances. Instead of introducing more or less short capacitors as concentrated elements in the line, and the capacitance coating can be a two-wire line such. As a coaxial line or multi-wire cables anyway over their entire length provide for the compensation of the longitudinal inductances are used. For this purpose, the inner and outer conductors are alternately interrupted at equal intervals, thus forcing the flow of current through the distributed transverse capacitances. The advantage of the distributed capacitances lies in a reduced requirement for the dielectric strength of the dielectric.

Of course, a compensated electrode with distributed capacitances in combination with a device for electrolyte introduction can be used. In the deck structure, are vertically guided by the forward and return conductors to the reservoir 100, a heating effect is undesirable: In the vertical region of the double conductor 10, 20, which is not yet in the reservoir 100, but leads down to this can Hinleiter 10 and return conductor 20 in placed at a small distance of, for example, 1 to 3 m, whereby their magnetic fields already compensate at a smaller distance from the double line and the inductive heating effect is reduced accordingly.

Alternatively, conductors 10 and return conductors 20 may be surrounded by a shield of high conductivity material surrounding both conductors to prevent inductive heating of the surrounding soil of the cover structure.

In a further alternative, a coaxial conductor arrangement in vertical section and return conductors is conceivable that results in a perfect cancellation of the magnetic fields in the outer region and thus no inductive heating of the surroundi ^¬ constricting soil. The increased cross-capacitance coating can be used to implement a gyrator, which converts a voltage of a voltage impressing converter into an alternating current according to the prior art, with help.

For all three mentioned methods, a compensation of the respective inductance coating of the conductor arrangement including the possibly existing shielding is necessary.

The power generator 60 in FIG. 2 is designed as a high-frequency generator. It can generate power up to 2500 kW. Typically, frequencies between 5 and 20 kHz are used. However, higher frequencies can also be used. The power generator 60 is three-phase and advantageously includes a transformer coupling and power semiconductors as components. Insbesonde ^¬ re, the circuit includes a voltage-inverter. A current injection with load-independent basic Oscillation, which is adjustable by means of filter components, results in this case with a suitable choice of Anpassvierpols. Depending on the topology of the quadripole, a different current load of the feeding inverter results.

As already mentioned, in such a generator for the intended use an operation under resonance conditions is required in order to achieve a reactive power compensation. If necessary, the drive frequency is suitably adjusted during operation.

In the case of a conductor loop 10, 15, 20 according to FIG. 2, which represents a two-pole inductor, a single-phase generator can also be used. Such generators with, for example, 440 KW at 50 KHz are commercially available.

As described above and known from the prior art, a targeted increase in the heating effect can be achieved by introducing electrolyte into the ground. It can be ^¬ be introduced, for example water or an electrically conductive aqueous saline or other electrolytes in the reservoir to raised stabili ^¬ hen the conductivity of the reservoir.

The problem here, as well as without the introduction of electrolyte, the heating of the conductor 3 and the conductor loop 10, 20, 15 by heat conduction from the soil to the conductor 3. As mentioned above, the materials such as insulator and Dielek- are only up to certain temperatures stable, depending on the choice of material. Advertising at high heating capacity, therefore, may alternatively or additionally (following time), via introduction of a fluid into the soil according to the invention the Leitfä ^¬ ability around the conductor 3 selectively reduced to. Water, and / or gases such as air, nitrogen, carbon dioxide, and / or solutions of chemical substances which are too poorly soluble in the reservoir, serve as fluids. salts and thereby lead to precipitation of ions in the reservoir.

As a result, in the case of inductive heating of the ground via the conductor 3, the heating power in the immediate vicinity of the conductor 3 can be reduced. Through the fluid, the conductivity ^¬ speed in the area, for example, up to 3 m around the conductor 3 around lowered. The decrease in conductivity is particular ^¬ DERS strong in the immediate vicinity of the conductor 3, where most of the heating occurs by induction. The induced ion currents in the soil around the conductor 3 are reduced by the fluid or the reduction of the conductivity in the ground. In more distant regions of the conductor 3, where the heating power by induction is lower, there is less, if any, reduction in conductivity by the fluid. Although this is also introduced in more remote areas of the soil by, for example, diffusion, depending ^¬ but to a much lesser extent than in the immediate vicinity of the conductor 3 around. As a result, the lower heating power, which in more remote from the conductor 3 areas of

Soil occurs, not reduced or only geringfü ^¬ gig reduced. In the immediate vicinity, decreasing with the distance from the conductor 3, the conductivity, so that the induced heating power and thus the heating is reduced. The lower amount of heat in the vicinity of the conductor 3 leads to a lower heat conduction to the conductor 3 and thus to a lower heating of the conductor 3 itself. The temperature T _{L of} the conductor 3 can thus be limited to a maximum value at which the individual materials of the conductor 3 are not thermally damaged and are long-term stable.

By the method according to the invention described above, the heating power in the vicinity of the electrical conductor 3 is made uniform. In the immediate vicinity, the conductivity is at high field strengths indu ^¬ ed reduced by the conductor 3 around by reducing the conductivity of the heating power, while further away do not or only slightly altered is changed and thus the heating power remains substantially the same. With the same electrical power for the induction via the conductor 3, the conductor 3 is heated less strongly, with the advantages described above. As a result, the power can be further increased as long as the critical temperature value at the conductor 3 is not reached, in which materials such as insulation or dielectric are damaged. It is thus achieved that a better heating of the soil takes place away from the conductor 3 by way of more induction, and thus better liquefaction or fluidization of the heavy oil or bitumen. By reducing the conductivity in the vicinity of the conductor 3 less Erwär ^¬ tion is achieved in the immediate vicinity of the conductor 3 and thus a lower heat transfer to the conductor 3, which results in less heating of the conductor 3 itself. Thus, with the inventive method without damaging the conductor 3 in a larger environment of the conductor 3 heavy oil or bitumen can be liquefied and a flow rate can be increased.

The invention is not limited to the above-described exporting ^¬ approximately example of the method. Combinations of prior art methods with the method according to the invention are also possible. Thus, for example, a temporally successive introduction of electrolyte to increase the conductivity, followed by an introduction of fluid to reduce the conductivity in the vicinity of the conductor 3 is possible. As a result, for example, a first promotion of heavy oil and bitumen in the immediate vicinity of the conductor 3 with less induction and heating power done. Subsequently, after introduction of the fluid to reduce the conductivity, 3 heavy oil or bitumen can be liquefied more remote from the line 3 and thus promoted at higher power without damaging the line.

A repeated, alternating introduction of electrolyte to increase the conductivity and of fluid to reduce the conductivity is possible. This can temporarily a Cooling of the line 3 can be achieved. A pulsewise, repeated introduction of only fluid to reduce the conductivity is possible.

Em introduction of electrolyte to increase the conductivity followed by an introduction of fluid to reduce the conductivity in the vicinity of the conductor 3 may also be advantageous if in distant areas of the conductor 3 good promotion of heavy oil or bitumen achieved who should. Thus, the electrolyte can be introduced to increase the conductivity in more remote areas, for example by high pressure and / or diffusion, and in the immediate vicinity of the conductor 3, the subsequently introduced fluid to reduce the conductivity displace the electrolyte to increase the conductivity. As a result, the induced heating power is increased in more remote areas, while in the immediate vicinity of the conductor 3 and the conductor 3 itself, the heating is reduced. It may just be an advantage that a liquid electrolyte conducts heat better than, for example, a gas. Thus, the lower In ^¬ production can be compensated away from the conductor by a better conductivity and immediately in the vicinity of the conductor 3, a gas z lead to a reduced heat transfer to the conductor 3 out.

The above-described inventive methods, even or in combination, lead to improved heavy oil or bitumen production, by high usable electrical power and associated induction with reduced risk of thermal damage to the conductor 3 or the materials of its components, e.g. Dielectric and / or insulation.

Claims

claims

1. Method of "in situ" production of bitumen or

Heavy oil from oil sands deposits (100) as a reservoir (1), wherein the reservoir (1) is inductively heated by at least one electrical current-carrying conductor (3) to reduce the viscosity of the bitumen or heavy oil, and wherein at least one perforated fluid guide (30 ), which at least partially surrounds or comprises the at least one conductor (3), a fluid (45) is introduced into the reservoir (1) via the perforation (41, 42, 43) in the fluid guide (30), characterized in that the fluid (45) at least ^¬ reduced electrical conductivity in the reservoir (1) in the vicinity of the fluid guide (30).

2. The method according to claim 1, characterized in that as a fluid (45) water with a lower conductivity than the conductivity of water in the reservoir (1) located in the reservoir (1) is introduced.

3. The method according to any one of the preceding claims, characterized in that as a fluid (45) gas is introduced into the reservoir (1).

4. The method according to claim 3, characterized in that air is used as the gas or the gas comprises air.

5. The method according to claim 3, characterized in that carbon dioxide and / or nitrogen is used as the gas or the gas comprises carbon dioxide and / or nitrogen.

6. The method according to any one of the preceding claims, characterized in that as a fluid (45) a solution of chemi ^¬ cal substances in the reservoir (1) is introduced, the chemical substances to a sparingly soluble salt in the reservoir (1) and thereby react a precipitation of ions in the reservoir (1) lead.

7. The method according to claim 6, characterized in that a chemical analysis of at least one fluid, in particular water, from the reservoir (1) is used to determine ions and depending on the particular ions, the chemical substances in the solution (45) selected to then precipitate ions in the reservoir (1) with the solution (45).

8. The method according to any one of the preceding claims, characterized in that by reducing the electrical conductivity in the reservoir (1), the inductive heating via the current-carrying conductor (3) is reduced.

9. The method according to claim 8, characterized in that the temperature T in the direct or indirect environment of the conductor (3) and / or the fluid guide (30) is limited to a maximum value, in particular to a value less than 250 ° C.

10. The method according to claim 9, characterized in that the temperature T is limited to a maximum value at which components of a device for "in situ" promotion of bitumen or heavy oil from oil sands deposits (100) as a reservoir (1 ), in particular insulating materials of the conductor (3), dielectrics (33) between conductor components and / or materials of the fluid guide (30), are temperature-stable.

11. The method according to any one of the preceding claims, characterized in that the fluid (45) reduces the electrical conductivity in the vicinity of the fluid guide (30), in particular in the range of 3 m around the fluid guide (30) around.

12. The method according to any one of the preceding claims, characterized in that the electrical conductor (3) of an alternating current having a current in the range of more than 100 A, in particular 270 A, and / or having a frequency in the range of 10 kHz to 100 kHz, in particular 75 kHz, through- In particular, the soil of the reservoir (1) in the vicinity of the electrical conductor (3) is heated by induced currents in the ground, in particular with a heating power in the range of several MW at voltages across the electrical conductor (3) in the range of greater than 10 kV