Method of carbon dioxide recovery in aquifer

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to environmental protection against man-made contaminants, hothouse gases and power source synthesis. In compliance with proposed invention, this method comprises isolation of aquifer with, preferably, with cropout and feed area as, for example, a river, lake, sea with total active filtration conditions. At least one local trap is isolated in isolated bed. Selected aquifer and local trap are prepared for commercial use with definition of isolated aquifer water chemical composition and that of rocks by core sample. Carbon dioxide is injected to isolated aquifer via one injection well located on aquifer feed zone side to allow downstream of injected carbon dioxide in aquifer. Catalytic reaction of polycondensation synthesis of injected carbon dioxide and water to form hydrogen, oxygen and methane homologues.

EFFECT: higher efficiency of recovery for replenishment of hydrocarbons stores and development of new oil and gas deposits.

11 cl, 4 dwg

 

The technical field to which the invention relates.

The invention relates to the field of environmental protection from air pollution anthropogenic emissions of greenhouse gases, and in particular to methods of recycling and disposal in the depths of the carbon dioxide - carbon dioxide (CO2) by injecting into the aquifer. In addition, the invention provides the possibility of synthesis of hydrocarbons using carbon dioxide.

Prior art

Currently in the world there is an acute problem of disposal of carbon dioxide emitted in large quantities into the atmosphere by industrial enterprises, which leads to warming of the planet. Therefore, in Western Europe, USA, China, India and other countries actively carried out various studies on utilization and disposal of carbon dioxide in an industrial scale.

A known method of utilization of carbon dioxide by pumping it into underground oil-bearing formation in the form of carbonated water (dissolved in water) in the development of oil deposits [P. Zheltov the Development of oil fields. M.: Nedra, 1999, s-253]. The most common way received on deposits USA, because of the country's deposits of carbon dioxide, as well as the location of a significant number of neftepererab yuusha plants near the developed oil fields.

According to this method, the field's drilling a system of production and injection wells. In injection wells are injection of carbonated water. For this field in injected into the formation water is added to carbon dioxide, which dissolves well in water. This carbonated water performs the following functions:

- maintains reservoir pressure in the field in its development process to extract the oil; it displaces oil to the faces of producing wells;

- carbon dioxide dissolved in water, soluble in oil and residual water in the reservoir prior to the development of the field. This reduces the viscosity of the oil increases its gas content, decreases the density, the oil increases in volume. Residual water also increases in volume, increasing its gas content, decreases the viscosity of water. These factors lead to the fact that the aqueous phase is better displaces oil from the pore space. Additionally there is a lowering of the interfacial tension at the boundary of the oil with water.

Ultimately increase the value of the current and final oil recovery factor up to 10% and more [P. Zheltov the Development of oil fields. M.: Nedra, 1999, s-253; Y. Cinar, Riaz A., Tchelepi N.A. Experimental study of CO2 injection into saline formations // SPE Jornal. 2009. Vol.14, No. 4, p.588-594].

The disadvantages of this method are the following:

- it is known that most of the deposits develop on the basis of flooding, that is, when the injection of water from available sources (rivers, seas, underground water, water from the aquifer). This is largely due to the minimization of costs in the initial years of development. So nepovsemestnoy distribution of injection of carbon dioxide is explained by the appreciation of appropriate technology development;

- this method is similar requires a source of carbon dioxide was not far from mine. Otherwise, the additional oil recovery by injection of carbonated water is not enough to cover the corresponding costs;

according further to the presentation involved in the method of disposal of carbon dioxide do not take into account new ideas in the Genesis of hydrocarbons.

Known methods of disposal of carbon dioxide by injection into depleted gas fields or in underground salt aquifers [Galis N., Cawley, S., Bishop, S., Todman S., F. Gas CO2 injection into depleted gas reservoirs // J. Petrol. Techn. 2010. No. 7, p.76-79; Y. Cinar, Riaz A., H.A. Tchelepi Experimental study of CO2 injection into saline formations // SPE Journal. 2009. Vol.14, No. 4, p.588-594].

These methods of disposal of carbon dioxide is quite realistic, because:

they all are based n the known methods of Geology, Geophysics study and research of those objects, which intend to inject carbon dioxide. It is on the basis of these methods and identify the most suitable objects;

- known methods based on the techniques and technologies used in the oil and gas industry. These include equipment and technology appropriate drilling injection wells, pumps and compressors, industrial equipment (separators, heat exchangers and others)that allows you to prepare for the injection and to carry out the injection of carbon dioxide in the raw gas reservoir or aquifer;

- in the justification of the relevant project document use modern methods of three-dimensional (3D) computer modeling, and conduct laboratory experiments and research to improve computational algorithms;

- there are examples of practical implementation of the method of injection of carbon dioxide in the raw reservoir gas [Galis N., Cawley, S., Bishop, S., Todman S., F. Gas CO2 injection into depleted gas reservoirs // J. Petrol. Techn. 2010. No. 7, R-79]. A main, traditional underground gas storage facility created as in depleted gas deposits and aquifers, demonstrate the feasibility of disposal of carbon dioxide in such natural objects;

- designed and created methods of monitoring the process of injection and storage in the reservoir diox is Yes carbon.

However, these methods analogs are not universal and are characterized by the following disadvantages:

- depleted gas deposits are usually located far from industrial sources of emissions of carbon dioxide in the atmosphere.

- the implementation of the methods of disposal of carbon dioxide calculated on unrecoupment capital and operating costs. As the usefulness of impact on the climate of the planet is difficult to calculate and take into account, therefore, for investors, these methods are not attractive. Remains the only, but a perverse incentive for the implementation of these methods is the penalties for carbon dioxide emissions into the atmosphere.

The proposed invention is the closest analogue is the method of disposal of carbon dioxide in the aquifer. It should be noted the following:

- aquifers in principle more affordable (compared to depleted gas deposits) for the purposes of disposing of carbon dioxide. However, there are no strict criteria for the selection of layers for the purposes of recycling. So, in the case of congestive aquifers difficult warehousing them in large amounts of carbon dioxide, because of its dissolution will be determined, in the main, poorly flowing diffusion processes. Injection of carbon dioxide in underground waterproof the red layers with active, but uncontrolled filtration regime and without taking into account structural features of occurrence of these layers can lead to rapid flow of carbon dioxide back into the atmosphere. Utilization of carbon dioxide in the aquifer more expensive than the use of depleted gas reservoirs, because it requires the drilling of new wells, creation of industrial infrastructure.

Description of the drawings

Figure 1. The experimental setup, where 1 is the reaction column with a heating element, 2 - mixer, 3 - separator-drive, 4 - gas chromatograph, 5 - cylinder with carbon dioxide, 6 - gear, 7 - adjustable valve, 8 - gauge, 9 - recirculation pump, 10 - meter, 11 - pH-meter.

Figure 2. Chromatogram of gases produced during the reaction at low (a) and high (b) the hydrogen yield, where a is hydrogen; b is methane; - isopentane. At high output peak hydrogen overlaps the peak of methane.

Figure 3. The scheme of utilization of carbon dioxide, where the 12 - day surface 13 Sandstone, 14 - reservoir 15 in the direction of the natural filtration of water flow, 16 - layer top, 17 - bottom layer, 18 - synthetic oil hydrocarbons, 19 - developed reservoir hydrocarbons, 20 - receipt of hydrocarbons, 21 - injection well, the 22 - producing well.

Figure 4. The layout of injection wells near the antura mine, where 23 - developed oil field, 24 - external water circuit.

Experimental substantiation of the invention

The basis of the invention is based on the results of laboratory experiments reproduced the process of recovering carbon dioxide to hydrocarbon oil series in thermobaric conditions of the upper horizons of the earth's crust. Used laboratory setup is schematically shown in figure 1. The installation consisted of the reaction column (1)filled with iron-containing substance. At the entrance of the reaction column from the mixer (2) was served water with a given concentration of dissolved carbon dioxide. At the exit of the reactor liquid was supplied to the separator-accumulator (3), where there was the separation from her gaseous reaction products, which are then analyzed by a gas analyzer (4). The mixer was tank capacity 20 l, vyderzhivavshie pressure of 15 ATM. To prepare the solution was used balloon with carbon dioxide (5). The concentration of carbon dioxide in the solution was regulated pressure and feeding of carbon dioxide poured into the mixer water. Used water from the artesian well. Pressure of carbon dioxide submitted to the mixer was varied in the range from 0.5 to 15 ATM. It is possible to adjust the rate of flow of solution through the reactor. Rea is Thor was a piece of plastic pipe with a length of 1 m and an inner diameter of 19 mm, zapolneniya iron-containing substance (iron shavings, powder monoxide and dioxide, iron and others). On the outside of the tube for heating in separate experiments housed electric spiral. The detector served as a gas chromatograph "Chromoplast-001", intended for the measurement of hydrogen, methane, ethane, propane, isobutane, butane, isopentane and pentane in air. The analyzer had two chromatographic columns of different length, which allowed to determine the hydrogen and these gases with a sensitivity of 0.001%.

Already in the process of debugging the laboratory setup was found that the dissolution of carbon dioxide in the water, as usual well, and distilled, the formation of hydrogen and hydrocarbon gases even in the mixing chamber with the metal case.

In figure 2,and presents a range of gases encountered in the mixer filled with distilled water at a gauge pressure in the chamber 1 ATM. On the y-axis presents the chromatograph readings in arbitrary units, and the abscissa shows the time of analysis in the chromatograph. On the spectrum are clearly visible peaks of hydrogen and methane. The hydrogen content was 0.016%, which obviously exceeds the limit of sensitivity of the chromatograph.

High molecular weight homologues of methane could be allocated in gases, obtained by passing the one solution of carbon dioxide through the reactor, filled with Sandstone or marble chips mixed with iron, which played the role of catalyst. In this case, was also observed ethane, isobutane and pentane. When the hydrogen yield more than 10% had difficulty in determining methane (figure 2,b).

Performed the experiments confirmed possibility of hydrogen, oxygen, and synthesis of hydrocarbons, primarily methane and its high molecular weight homologues, natural conditions of the sedimentary cover of the earth's crust. These experiments have extended the scope of practical application of polycondensation reactions of synthesis, it is now widely used for the production of synthetic hydrocarbons [Storch,, Golumbic N., Anderson R. the Synthesis of hydrocarbons from carbon monoxide and hydrogen. M: Foreign literature, 1954, 516 S.] and hydrogen [Jonah KG ABOUT the role of hydrogen in the technological evolution of the Earth (whether Land catalytic reactor?). Novosibirsk: Izd-vo sec "ZEOSIT". 2003. 68 C.] on an industrial scale.

When developing Romashkinskoye oil field [Muslimov, BC, Glumov NF, Plotnikov I. and other Oil and gas field self - developing and rolling objects. / / Geology of oil and gas. Spec. release. 2004. S.43-49] and Shebelinka gas condensate field [Zakirov, S.N., Indrusty IM Zakirov AS and other New principles and technologies to develop ODI oil and gas. Part two. M-Izhevsk, Institute of computer technologies. 2009. S-329.] there are phenomena that can only be explained by the presence of tributaries of deep hydrocarbons in the studied deposits. This leaves open the question about the source of such deep hydrocarbons. The experimental results allowed us to solve the problem of substantiation of this source, proving the possibility of the formation constant of the deep flow of hydrocarbons through the presented synthesis reaction.

Thus, the experimental results also confirm an alternative model of petroleum formation, expressed in [Barenbaum A.A. Mechanism of formation of accumulations of oil and gas, " DOKL. 2004. So 399. No. 6. S-805]. According to the conclusions of this work, the oil and gas are by-products of the global geochemical cycle of carbon on the planet.

Summary of the invention

The present invention allows to solve two topical and global challenges: ensuring reliable utilization in the depths of man-made excess carbon dioxide and at the same time the artificial generation of hydrocarbons as well as hydrogen and oxygen, which can make up for dwindling in the oil and gas reserves and develop new oil and gas fields.

The technical result from the retene is to increase the efficiency of the recycling process of carbon dioxide in underground aquifers due to the formation of this gas anthropogenic hydrocarbons, hydrogen and oxygen, which is more fully prevents back leakage of carbon dioxide from the reservoir into the atmosphere.

These problems are solved and a technical result is achieved in that the method of disposal of carbon dioxide includes: selecting at least one underground aquifer, having access to the earth's surface and the area of nutrition in the form of rivers, seas, lakes and common mode filter; identifying in the selected layer, at least one local lithological traps; the preparation of the aquifer and the local traps for industrial use; determination of the chemical composition of produced water and rock samples (core); the injection of carbon dioxide in the aquifer through at least one injection well, hosted by the nutrition of the reservoir and providing it as an opportunity to downstream of the injected carbon dioxide in the aquifer create or form the synthesis of hydrocarbons and the evolution of hydrogen and oxygen from carbon dioxide and water, the degree of manifestation of this process set the mode of injection of carbon dioxide into the reservoir and controlled by the fluid composition in the local trap.

While it is preferable if: carbon dioxide is injected in the form of fringes gas and/or gas dissolved in water; underground aquifer choose an area of natural deposits of hydrocarbons and injection wells are placed in the frontal part (from the natural filtration of water flow) field at a distance of 1-2 km from the outer oil-water or gas-contact (figure 3); as aquifer choose a highly porous sedimentary rocks, which are metals of the iron group (Fe, Ni, Co, Mo), oxides SiO2and Al2O3and clay and zeolites having a high catalytic activity in the polycondensation synthesis of hydrocarbons from carbon oxides and hydrogen [Barenbaum A.A. Mechanism of formation of accumulations of oil and gas, " DOKL. 2004. So 399. No. 6. S-805]; the synthesis of hydrocarbons and the production of hydrogen and oxygen in the aquifer is controlled by setting the pressure of injection of carbon dioxide, its flow rate and temperature; carbon dioxide is injected into the aquifer through injection wells, at least one mode, providing a more complete distribution of carbon dioxide in the thickness of the reservoir; with injection of carbon dioxide through injection wells at least one and removing water from the wells of at least one of the local stagnation zones filtering aquifer activate natural filtration the first flow of water and create a local artificial accumulation of hydrocarbons; this is the purpose of oil production in developed reservoirs (3, 4); as injection and production wells using the previously drilled exploration or piezometric wells; control over the process of synthesis of hydrocarbons, hydrogen evolution and oxygen in the aquifer are carried out through the observation well at least one that is hydraulically connected with the local trap, and also in producing wells of at least one of the local trap and/or the development of hydrocarbon fields; control over the process of synthesis of hydrocarbons is carried out in the monitoring mode from the moment of injection of carbon dioxide in the aquifer, including analyses on the content of the isotope14With; as hydrocarbons mainly carry out the synthesis of methane and its high molecular weight homologues.

The method is as follows (see figure 3).

Near natural deposits of hydrocarbons from the surface (12) or, regardless of the presence of the field and, for example, in the vicinity of the source to be disposed of anthropogenic carbon dioxide, produce sustained regional groundwater aquifer (13) - water pool at least one having access to the surface of known area power supply (14) in the form of rivers, seas, lakes, i.e. the clarification is Noah orientation of the natural filtration of water flow (15). To this end, for example, pre-teach the necessary seismic, geophysical and hydrogeological studies. When this form or choose mentioned aquifer or its plot with a pronounced structural dip (immersion) and total active filtering mode. In the considered aquifer (13) with a roof (16) and sole (17) allocate local stagnant zone filtering at least one characterized by structural features such as a domed structure acting as a barrier to the migration of hydrocarbons in geological traps (18).

Carry out training of the selected aquifer and local traps for commercial use. This stage, in particular, may include: gathering the necessary information about the status of research; the creation of 3D geological and hydrodynamic models: adaptation of the 3D hydrodynamic model to the actual data; conducting optimizing predictive calculations (taking into account the flow in the reservoir chemical reactions) with the best possible injection of carbon dioxide together with the in-situ generation of hydrogen, oxygen, and homologues of methane and determination of the best parameters of injection and production wells, as well as their arrangement. The best indicators and parameters on which are determined on the basis of the optimization process and its value.

Determine the complete chemical composition of the water in the reservoir (13) and rock samples - core potential use of ingredients for the implementation of the proposed method. In particular, determine the composition of the water and the iron core and other chemical elements that can serve as catalysts initiated in the formation reaction for the synthesis of hydrocarbons and of hydrogen and oxygen. If necessary to aquifer can upload additional amount of catalyst or additional catalyst.

Carry out the injection of carbon dioxide in the selected aquifer (13) through injection wells (21) at least one hosted by nutrition (14) aquifer and allowing downward flow (15) of the injected carbon dioxide in the reservoir. As injection wells at least one used previously drilled exploration or piezometric wells, and/or create new wells.

When implementing the proposed method, unlike traditional gas methods of stimulation, restrictive conditions are as follows.

Bottom-hole pressure in the injection wells must be such that the injected solution of carbon dioxide or the slug of carbon dioxide is not received on the earth's surface or in the shallow minimum output. The model can be determined on the basis of computer calculations of the conditions newsplease injected agent to the surface of the earth. Approaching the location of the planned injection wells to nutrition affects the probability of emergence of the injected carbon dioxide on the surface. And removal from the field of power necessitates the drilling of deeper wells.

For the process of injection of carbon dioxide in the form of fringes or solution can be used well and standard equipment applicable in the oil fields when implementing gas methods of influence and using carbon dioxide as a working agent.

The number and location in terms of lithologic traps and producing fields determine the number of injection wells and the distance between them. Injection wells must create a filtration flux of the injected working agent such width, to ensure the greatest coverage traps and deposits the synthesis of hydrocarbons, hydrogen and oxygen. Specific indicators of process recycling of carbon dioxide establish on the basis of 3D computer calculations for specific parameters, the number and location of traps and required volumes of utilization of d is carbon monoxide. To do this, perform 3D modeling of the reservoir and the process model.

Thus the injection of carbon dioxide in the aquifer creates conditions for the synthesis of hydrocarbons and of hydrogen and oxygen. As shown by the results of laboratory experiments at pressures up to 15 ATM is a reaction for the synthesis of hydrocarbons from hydrogen evolution and oxygen. It is well known that the velocity of such reactions increases with the pressure. Therefore, one should expect that the implementation of the proposed method in practice will be accompanied by favorable conditions for the synthesis of hydrocarbons, hydrogen and oxygen by filtering the solution of carbon dioxide to greater depths with the inherent pressures.

Carbon dioxide is injected into the mode that provides the best distribution of the thickness of the aquifer in accordance with the preferred results of the 3D simulation.

In order to intensify the natural filtration of water flow on the structural trap (18) Buryats and put into operation of a producing well at least one. Of these wells initially selected only the produced water, and then synthesized in the reservoir hydrocarbons, and emissions of hydrogen with oxygen.

The most appropriate mode and method of operation of producing wells definition is given on the basis of traditional research wells under steady-state modes of the filter.

For the process of water extraction and synthesized hydrocarbons, hydrogen and oxygen can be used producing wells and standard commercial equipment used in implementing the methods of gas exposure in the oil fields.

The intensification of the natural filtration of water flow operation is watering wells (22) for producing field, of which produced oil and produced water. When this produced water at the field back into the formation through injection wells (21), at least one. Induced by the injection of carbon dioxide synthesized hydrocarbons, hydrogen and oxygen due to gravitational factors are accumulated in the local stagnant zones filtering geological traps (18). In this part of the oxygen is consumed in the oxidation processes in the reservoir.

Created by the accumulation of hydrocarbons (18) can be combined, for example, with natural develop the hydrocarbon (19). Receipt of the synthesized hydrocarbons in the so-called artificial and natural deposits shown in the figure 3 position (20).

The synthesis of hydrocarbons in the reservoir is controlled by specifying the composition and properties of the injected water amount of carbon dioxide and mode of its injection, and type and number to the supplied water with a catalyst. The number of synthesized hydrocarbons, hydrogen, and oxygen is determined on the basis of methods of chromatography. To this end, the separator periodically carry out gas samples. Control the degree of utilization injected into the aquifer of carbon dioxide by measuring the amounts of synthesized hydrocarbons, hydrogen, and oxygen accumulated in stagnant local area of the reservoir (18), where drill hole, including analysis of the hydrocarbon content of the isotope14With, for example, liquid scintillation spectrometry, which allows the identification of natural and anthropogenic hydrocarbons. In case of reduction of the output of the synthesized hydrocarbons, hydrogen, and oxygen in producing wells are pumping rims of the solution of polymer, such as polyacrylamide, in injection wells. The result is aligned injectivity profile that allows you to attach additional volumes of the aquifer to the synthesis of the desired products. This approach is widely used in the practice of oil by water flooding of the reservoir.

Rationale feasibility of inventions

The validity and reliability of the proposed method, first of all, determine the results of the laboratory experiments. Analyzing the results, it should be noted that C is a small length of the reaction column (1 meter) of the injected aqueous solution of carbon dioxide in it were unable to fully react. Therefore, the output of the installation has been not involved in the synthesis of carbon dioxide gas, significantly decrease the percentage of synthesized hydrocarbons and hydrogen according to the testimony of the chromatograph.

In the proposed method, injected into an aquifer, a carbon dioxide filtration for several kilometers, which dramatically increases the degree of its conversion to hydrocarbons, hydrogen and oxygen. It is such a large factor, as is well known, lies at the basis of known technologies for industrial production of hydrocarbons methods of polycondensation synthesis [Storch,, Golumbic N., Anderson R. the Synthesis of hydrocarbons from carbon monoxide and hydrogen. M: Foreign literature, 1954, 516 S.]. This explains the estimated value of the distance (1-2 km) injection wells from path field in figure 4. But the specified value should be specified (or decrease) using multivariate 3D geological and hydrodynamic modeling for the particular case of the industrial disposal of carbon dioxide.

As an example, of direct relevance to the implementation of the invention in practice, we shall refer to the results of field experimental studies [Smigafi P., Greksak M, Kozankova J. et all. Methanogenic bacteria as a key factor involved in changes of town gas stored in an undergroud reservoir // FEMS Microbiology Ecology. 1990. V.73. P.221-224]. The authors of this work has led data about the chemical composition of the so-called town gas, uploaded and selected from underground gas storage facilities Lobodice created in the Czech Republic, in the aquifer. If injected into the storage gas was 20% of CH4, 20% CO2+CO and 55% H2then six months later when selecting the composition of the gas was different: CH440%, CO2+WITH 12% and H237%.

Compared with pumped into the selected gas methane content for the six months increased by two times, and the total content of carbon and carbon monoxide in almost the same time decreased. Decreased hydrogen content that primarily speaks about possible leaks of this lively and very light gas that traps in aquifer gas storage Lobodice. Changes in the composition of injected gas, the authors cited studies try to explain the activity of underground methane-producing bacteria. The results of laboratory experiments provide an alternative and more convincing explanation of the observed facts.

Marked leakage of hydrogen is quite often observed in nature when the so-called degassing of the Earth [the Degassing of the Earth: geotectonics, geodynamics, geofluids, oil and gas, hydrocarbons, and life. Materials of all-Russian conference with international participation devoted to the 100 anniversary from the birthday of academician P.N. Kropotkin. November 18-22, 2010, Moscow]. According to the actual data in the products of degassing the largest share falls on hydrogen. However, this is not reflected in the ecology of the planet, as the hydrogen rises into the stratosphere and then dissipated into Space in the form of hydrogen plume of the Earth. As for hydrocarbons, they mostly remain in the natural flow of water and form or fuel oil and gas [Barenbaum A.A. Mechanism of formation of accumulations of oil and gas, " DOKL. 2004. So 399. No. 6. S-805].

Therefore, it is permissible to say that in aquifer gas storage Lobodice, the synthesis of methane from dissolved carbon dioxide. However, it is possible that the activity of the microorganisms will be an additional factor contributing to a more complete utilization of carbon dioxide in underground aquifers.

According to the authors of the present invention, it is even more important to increase the effectiveness of the proposed method involves the use of catalysts as a natural present in the rocks of the aquifer and injected into the reservoir together with a water solution of carbon dioxide. Such catalysts dramatically intensify the reactions of synthesis of hydrocarbons and hydrogen, as is known, are some of the metals and their oxides, in particular metalgroup.be iron, as well as many minerals.

When implementing the proposed method on a specific geological object should begin with laboratory experiments. After a series of laboratory studies on each real object appropriate pilot work, which allow you with the required accuracy to justify the necessary technical and technological solutions for the implementation of the idea of the method on the object under consideration as a whole.

Thus, the proposed method of disposal of carbon dioxide in the aquifer complements the known method of its disposal that allows purely costly process to make a profit at the expense of opportunities are identified to produce hydrogen, oxygen and synthesized in the formation of hydrocarbons.

1. The method of utilization of carbon dioxide by injecting into the aquifer, according to which:
- allocate an underground aquifer, preferably having access to the earth's surface and the area of nutrition in the form of rivers, seas, lakes, and General active filtering mode;
- define in the selected layer of the at least one local trap;
- carry out training of the selected aquifer and local traps for commercial use with the definition in the selected formation of chemical composition of water, and rocks along the way who am rock - Kern;
- is injected into the selected reservoir of carbon dioxide by at least one injection well, hosted by the nutrition of the reservoir and allowing downward flow of the injected carbon dioxide in the reservoir;
- provide catalytic reaction of polycondensation synthesis of the injected carbon dioxide and water with the formation of hydrogen, oxygen, and homologues of methane.

2. The method according to claim 1, in which the activity is taking place in situ chemical reactions control the regulation of the mode-injection of carbon dioxide and water properties, and the control process for the synthesis of hydrocarbons from the formation of hydrogen is carried out in a local trap and wells mine.

3. The method according to claim 1, characterized in that the carbon dioxide is injected in the form of fringes gas or gas dissolved in the water.

4. The method according to claim 1, characterized in that the layer chosen in the area of natural deposits of hydrocarbons, and at least one injection well, placed in the frontal part of the Deposit of hydrocarbons, preferably by direction of the natural filtration of water flow, at a given distance, preferably 1-2 km, in accordance with the results of three-dimensional hydrodynamic modeling of the external oil-water or gas-contact.

5. The method according to claim 1, characterized in that injection wells using the previously drilled exploration and/or piezometric wells.

6. The method according to claim 1, characterized in that aquifer choose a highly porous sedimentary rocks, which are, in particular, the metals of the iron group (Fe, Ni, Co, Mo, oxides SiO2and Al2O3and clay and zeolites having a high catalytic activity in the reactions of polycondensation synthesis of hydrocarbons from carbon oxides.

7. The method according to claim 2, characterized in that the polycondensation process for the synthesis of hydrocarbons from carbon oxides in the layer control injection pressure of carbon dioxide, its flow rate and temperature.

8. The method according to claim 1, characterized in that the carbon dioxide is injected into an aquifer, a mode that provides optimal distribution of carbon dioxide on the thickness of the layer.

9. The method according to claim 2, characterized in that the control processes for the synthesis of hydrocarbons, hydrogen and oxygen in the aquifer conduct at least one observation well, which is hydraulically connected with the local trap, placed in a producing field or its surroundings.

10. The method according to claim 2, characterized in that the control process is the synthesis of the hydrocarbons, the release of hydrogen and oxygen in the aquifer is carried out in the monitoring mode from the moment of injection of carbon dioxide, including the analysis of content in the production wells isotope14C.

11. The method according to claim 1, characterized in that in addition to the utilization of carbon dioxide in the local stagnation zones filtering aquifer create an artificial reservoir of hydrocarbons, hydrogen and oxygen.



 

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EFFECT: simplified operations, lower laboriousness.

6 cl, 5 dwg

FIELD: gas, oil, oil refining and other industries.

SUBSTANCE: invention relates to building and operation of underground reservoir in stable rocks, for instance, soluble salt deposits. Method includes delivery of water and putting out brine along water feed and brine lifting pipes placed one inside the other, charging and storing of gas in underground reservoir. After brine lifting, reservoir is dried and then is filled up with alternating layers of absorbent and inert porous material, volume ratio 2:1, delivered along clearance between water feed and brine lifting pipes. Brine lifting pipe is perforated in lower part in height of reservoir and it is installed in lower part of reservoir. Difference between angles of repose of absorbent and inert material does not exceed 10 degrees. This done, reservoir is filled with gas delivered along perforated brine lifting pipe.

EFFECT: increased productive volume of reservoir owing to sorption of gas on surface of absorbent, reduced cost of gas storing.

1 dwg

The invention relates to mining and can be used in the design, construction and operation of enterprises the deep disposal of industrial liquid waste

FIELD: transport.

SUBSTANCE: proposed storage comprises reinforced concrete tank mounted on the bed of compacted soil and heat-isolation layer and having vertical sidewalls, said being surrounded by pliable layer at outer side surface and heat- and water-insulated from liquefied natural gas. Storage shaft is equipped with pipelines to fill said storage with said gas and its vapors and to discharge the latter therefrom. Said shaft extending from reinforced concrete tank to surface is equipped with tight hatches and staircase. Tank top is buried in the heat-insulation material layer. Note here that tank top features cross-section decreasing towards earth surface and is shaped to truncated cone and connected with said shaft by sealed flange joint. Aid tank top with flange joint are arranged at decreased spacing from frozen soil bottom surface.

EFFECT: simplified design.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: operating method of underground gas storages involves intermittent injection of gas by compressors, which is supplied from a main gas line through production and injection wells of an underground gas storage to a reservoir bed under pressure exceeding formation pressure; further extraction of gas from the underground storage for further gas supply to the main gas line. The above extraction from the underground storage and its supply to the main gas line is performed in a compressor mode that is performed till pressure in the reservoir bed reaches the value excluding allowable well water flooding. With that, a suction gas line of compressor is connected to a gas extraction pipeline from the underground gas storage, and a discharge gas line of compressors is connected to the main gas line.

EFFECT: improving operating efficiency of an underground gas storage.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to a method for making a low-permeability screen in porous medium at underground gas storage in porous reservoir beds and can be used in oil and gas producing industry. According to the invention, first, required volumes of solutions are determined in interwell spaces; the amount of 0.5-0.55 of design volume of spike solution and spike solution itself are pumped subsequently to injection wells till gases appear in a relief well; after that, design volumes of the solution and gas, which provide minimum required width of a screen, are pumped to the unloading well; waste gas of compressor stations is used as gas for creation of a screen. Nonflammable and/or inert gases are used as gases for creation of the screen.

EFFECT: increasing the screen continuity, reducing the flow rate of foaming agent solution and consumed energy for pumping-in and pumping-out, economy of natural gas and improvement of environmental situation in the underground gas storage location area.

3 cl, 6 tbl, 4 dwg

FIELD: packing industry.

SUBSTANCE: invention relates to the method of carbon dioxide (CO2) storage in a porous and permeable underground reservoir bed) and in particular, to the method for injection of CO2 into a hydrocarbon reservoir for its storage. The concept of the invention is as follows: the method includes the following stages: (a) extraction of a produced fluid flow from a development well, which contains produced hydrocarbons, water and CO2; (b) direction of the produced fluid flow to a process facility, where a steam phase flow is separated from this flow, containing carbon dioxide and volatile hydrocarbons; (c) compression of the produced steam phase flow to the pressure above the maximum pressure, when two phases of gas and liquid may coexist, for the composition of the produced steam phase flow; (d) cooling of the compressed flow with formation of the cooled flow in a dense phase condition; (e) direction of the CO2 flow towards the injection equipment, which arrives from the side and may be in a liquid phase or in a supercritical condition; (f) mixing of the cooled flow from the stage (d) with the flow of CO2 arriving from the side to form a combined flow, which represents a flow of a dense phase substance; and (g) injection of the specified combined flow into the hydrocarbon reservoir via an injection well.

EFFECT: increased efficiency of the method.

22 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to making underground reservoirs in rock salt formations. Reservoir is profiled using concentrically arranged tubes to lift brine, feed water and production pipes. Thereafter, water feed pipe is withdrawn to feed water feed column composed of flexible water feed pipe. Then, reservoir shape is corrected by feeding solvent at reservoir correction point via gap between brine lift tube and flexible water feed pipe of said column. Additionally, device comprises water feed column with flexible water feed pipe ropes arranged in symmetry about is cross-section and passed through rings rigidly secured to flexible pipe at regular spacing to connect flexible pipe bottom end with auxiliary winches.

EFFECT: expanded operating performances.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to underground storage and reservation system of LNG for its accumulation and distribution to the consumer. LNG US is located below the ground level 1 at the elevation preventing the freezing of ground surface at the most long-term estimated storage of LNG. It is blocked off and protected along the perimeter from ground mass with a concrete wall of "wall in ground" type 2. It includes reinforced-concrete tank 5 located at the bottom from compacted ground 3 and heat-insulating intermediate layer 4, which is enveloped on external side surface with soft intermediate layer 6, and on the inner side it is covered with layers of heat insulation 7 and waterproof insulation 8 from LNG. LNG US is equipped with process shaft 9 with pipelines 10, which comes out of reinforced-concrete reservoir to ground surface 1, tight hatches 11 and stairs 12. Top of concrete reservoir is filled with a layer of light heat-insulating material 13. Vertical wall of reinforced-concrete reservoir 5 is made of single-type elements of constant curvature in the form of solid reinforced-concrete units 14 of constant section with surfaces 15 adjacent to each other. Along the perimetre of end surfaces 15 of reinforced-concrete blocks 14 and their centre there made are grooves of rectangular section with tightening horizontal and vertical 18 reinforcement installed in them (vertical 17 and horizontal 18 tightening reinforcement rods).

EFFECT: use of the invention ensures reliability of horizontal tightening of reinforced-concrete blocks; simplifying the construction procedure of side walls of reservoir; improving construction quality and operating reliability of LNG US.

5 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed device comprises water feed tube with bottom head Note here that the latter features length exceeding radius of reservoir and is made of flexible water feed tube furnished with mechanical muscles secured thereto and pneumatically or hydraulically communicated with pressure source to control every muscle for positioning tube end in space.

EFFECT: higher efficiency.

3 dwg

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas industry and serves for creation of underground gas storages (UGS) on the base of non-hydrocarbon gases minefields. In geological structures filled with non-hydrocarbon gas there constructed are production wells with opening of geological structure collectors. Lithological and physical characteristics of rocks of geological structure cap are used to define maximum allowable pressure in geological structure and gas is filled in geological structure collector till this specified value with creation of buffer and active gas volume. Note that buffer gas volume is primary created from formation non-hydrocarbon gas, the gas pumping and further extraction is primary done in structure upper part. Gas extraction is done after holding layering time of mixture of pumped gas and formation non-hydrocarbon gas till the latter appears in production wells.

EFFECT: invention provides decrease of natural gas consumption for generation of gas buffer volume and creation of high process pressure in UGS.

FIELD: mining.

SUBSTANCE: underground reservoir filled with a brine is equipped with a casing pipe and a hanger pipe, test intervals are identified, interval injection of a test fluid is carried out into a tube space of casing and hanger pipes until the test fluid-brine interface reaches the lower elevation of the test interval with simultaneous displacement of brine to day surface. Application of test pressure is carried out with a time delay for each identified test interval and detection of pressure drop rate. Then the test pressure is repeatedly applied with additional pumping of the test fluid, afterwards value is determined, as well as leakage intensity by pressure drop rate and volume of added test fluid. At the same time, according to the invention, prior to application of test pressure, a hanger pipe block is installed under the casing pipe block, the lower elevation of the investigated interval is identified by volume of brine displaced from the underground reservoir and by values of test fluid and brine pressures measured at the wellhead in the period of underground reservoir pressurising. At the same time application of test pressure is carried out in stages by means of increasing it in the following sequence: 0.5 Ptest, 0.75 Ptest, Ptest, where Ptest - test pressure, with staged soaking of the underground reservoir in time under the specified pressures until the temperature background is balanced for the injected test fluid, brine and rock that holds the underground reservoir. Pressure drop rate is identified at each stage of the underground reservoir soaking in time under applied pressure, and value and intensity of leakage within the range of the identified test interval are set by averaged value of added test fluid volume during the period of staged application of pressure to the value of the test one.

EFFECT: increased reliability of testing for tightness of underground reservoirs.

1 dwg

FIELD: transport.

SUBSTANCE: proposed method comprises pumping waste drill fluids from drilling rig to subsurface reservoir 1, forcing them through well 2 into said reservoir and changing them into frozen state. For this, free space 7 is provided in reservoir top section making at least 9% of the volume of fluid contained in drill wastes. In-season refrigerating device 3 is lowered through the well onto the reservoir bottom into drill wastes sediments. Drill wastes are frozen at the temperature lower than that of permafrost rocks in direction from reservoir vertical axis to its side surface.

EFFECT: higher efficiency of disposal.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.

EFFECT: higher reliability and trustworthiness.

1 ex

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