Sulphur barrier for use in processes at deposit location for bed processing

FIELD: gas and oil production.

SUBSTANCE: method involves sulphur injection into one or more wellbores inside operation perimetre in a bed with minimum operation area permeability of 0.1 Darcy, and at least a part of sulphur should be able to move towards the bed parts with temperature below sulphur melting point, so that suplhur would solidify in the bed and form a barrier. Area adjoining wellbores is heated above sulphur melting point but below hydrocarbon hydrolysis temperature, further heating is stopped to cool the bed down in natural way so that sulphur solidifies in the bed. Method of barrier forming in bed involves heating of a bed part adjoining several wellbores to raise bed temperature near wellbores to a point above sulphur melting point but below hydrocarbon hydrolysis temperature, sulphur injection to the bed through at least some wellbores and ensuring sulphur movement from wellbores towards the bed parts with temperature below sulphur melting point so that suplhur solidifies in the bed and forms a barrier.

EFFECT: increased insulation efficiency.

20 cl, 2 dwg

 

The technical field to which the invention relates.

The present invention, in General, relates to methods and systems of forming a barrier around at least part of the underground processing. More specifically the present invention relates to a method of forming a barrier around the area processing using sulfur. The treatment area may be an area that was processed by heat treatment in situ, treated by heat treatment in situ or are to be processed by heat treatment at the place of occurrence.

The level of technology

For treatment of underground formations can be used in processes performed in-situ. During some of the processes that are performed in-situ in the reservoir can enter the fluid or the reservoir can be produced fluids. It may be necessary to contain the injected or produced fluids in the field of processing in order to minimize or eliminate the impact of the process in situ on the surrounding area. When carrying out certain processes in-situ, all around the process area or around the her part may be formed a barrier to the movement of fluids in the processing area or out of it.

For isolating selected areas of the underground reservoir to the difference the governmental purpose can be used in low temperature area. In some systems, in land reclamation land freeze to prevent movement of fluids from the processing area. System freeze land described in US patents No. 4860544, author Craig (Krieg) and others, No. 4974425, author Craig and others, No. 5507149, author of the dash (Dash) and the other, No. 6796139, author Shaved (Briley) and others, and No. 6854929, author Vinegar (Vinegar) and others.

To obtain low-temperature barrier in the reservoir, where it is necessary to form the barrier may be formed spaced apart from each other trunks wells. The borehole can be located pipe. To reduce the temperature next to the trunks of wells pipes can circulate low-temperature heat-transfer fluid. The low temperature area around the tree wells can extend outward. Ultimately zone low temperature formed by two adjacent trunks wells combined. The temperature of the zones of low temperature zones may be low enough to freeze formation fluid, so it's essentially impermeable barrier. The distance between the trunks of the well may be from 1 meter to 3 meters or more. Low-temperature barrier can be located at a considerable distance from the side of the reservoir, which will be heated by using a heat treatment process in-situ.

When in the execution of the processing in situ some of the layers can be obtained hydrogen sulfide or other compounds, containing sulfur. During some operations of the sulfur compounds can be obtained free sulfur. Sulfur can be obtained using the Claus process. By the Claus process may be receiving gaseous sulfur.

For forming a low temperature barrier may require significant hardware costs, energy and time. Additionally, after completion of the curing process, in-situ is desirable to maintain the isolation region processing in-situ from others treated or untreated areas of the reservoir. Therefore, it is desirable to have the ability to form a barrier layer of a material, which is available in the venue of the process in situ and which will remain in the reservoir after the completion of the processing operations in situ.

Disclosure of inventions

Described embodiments of the invention, in General, relate to systems and methods of forming the barrier of sulfur around at least part of the underground processing.

In some embodiments of the invention a method of forming barrier of sulfur around at least part of processing a subterranean formation includes the following: inject sulfur in one or more boreholes located inside the perimeter of the processing in the reservoir; and enable at least part sulfur to move in the direction of parts of the reservoir, the temperature of which is less than the melting point of sulfur, so sulfur hardened in the reservoir and formed the barrier.

In some embodiments of the invention, in combination with other variants of the invention, the permeability of the processing may be at least 0.1, at least 1 D of at least 10 L, at least 100 Days

In some embodiments of the invention, in combination with other variants of the invention, the permeability of the processing is increased due to the production process by dissolving and/or heat treatment process in-situ.

In some embodiments of the invention, in combination with other variants of the invention, the sulfur is injected into the formation in the form of liquid and/or steam. In some embodiments of the invention, in combination with other variants of the invention, the sulfur stream is directed to the perimeter of the processing area. In some embodiments of the invention, in combination with other variants of the invention, the trunks of the wells, which inject sulfur into the reservoir, are located near the perimeter of the processing area. In some embodiments of the invention, in combination with other options implemented the I invention, a low temperature barrier, at least partially surrounding the treatment area, improves the solidification of sulfur to form a barrier.

In some embodiments of the invention the method of forming the barrier layer includes: heated portion of the formation adjacent to the many trunks of wells, with the aim of increasing the temperature of the formation near the well holes to values exceeding the melting point of sulfur, but smaller temperature pyrolysis of hydrocarbons in the formation; pumping molten sulfur, at least in some trunks wells; and allow the sulfur to move from boreholes in the direction of parts of the reservoir, the temperature of which is less than the melting point of sulfur, so sulfur is solidified in the reservoir and forms a barrier.

In some embodiments of the invention, in combination with other variants of the invention, at least one heater is used to heat the portion of the formation adjacent to the well holes, is a heater with a temperature limit. In some embodiments of the invention, in combination with other variants of the invention from the processing area located inside the barrier, is extracted by dissolving and/or processing, located inside the barrier, use the process heat treatment is ODI in-situ. In some embodiments of the invention, in combination with other variants of the invention, the barrier is formed between the first barrier and the processing area, used for the extraction of fluid from the reservoir. In some embodiments of the invention, in combination with other variants of the invention, the temperature of the molten sulfur injected into the reservoir, close to the melting point of sulfur. In some embodiments of the invention, in combination with other variants of the invention, the processing is carbon dioxide.

In other embodiments of the invention the characteristics of the specific embodiments of the invention may be combined with features of other embodiments of the invention. For example, the characteristics of a variant embodiment of the invention can be combined with features of any other variant embodiment of the invention.

In other embodiments of the invention the processing of the underground formation is carried out using any of the methods described here or systems.

In other embodiments of the invention described here, the specific variants of the invention can be added additional features.

Brief description of drawings

The advantages of the present invention Boo the ut clear to experts in this field after reading the detailed description, contains references to the attached drawings, on which:

figure 1 is a view showing the steps of heating a formation containing hydrocarbons;

figure 2 - schematic view of a variant of implementation of the part of the system of heat treatment on the place of occurrence designed to handle reservoir containing hydrocarbons.

Although the invention does not exclude various modifications and alternative forms, then, for example, in the drawings shown and described specific embodiments of the invention. Drawings can be made not to scale. However, you must understand that the drawings and detailed description does not limit the invention described specific form, but on the contrary, the invention covers all modifications, equivalents and alternatives are not beyond the scope and essence of the present invention, which is defined in the attached claims.

Detailed description of the invention

The subsequent description, in General, relates to systems and methods for processing hydrocarbons in the reservoirs. Such layers can be processed using processing in situ implemented with the aim of hydrocarbon products, hydrogen and other products. All around the processing area affected by thermal treatment in situ, or around a part thereof may be SFOR the new barrier or barriers.

"Curie temperature" is a temperature above which a ferromagnetic material loses all its ferromagnetic properties. In addition to losing all their ferromagnetic properties at temperatures higher than the Curie temperature of the ferromagnetic material begins to lose its ferromagnetic properties when through him miss the increasing electric current.

"A layer" includes one or more layers containing hydrocarbons, one or more non-hydrocarbonaceous layer, overlying and/or underlying layer. "Hydrocarbon layers" refers to layers of the reservoir, which contain hydrocarbons. Hydrocarbon layers may contain non-hydrocarbonaceous material and a hydrocarbon material. "The covering layer and/or underlying layer contain one or more different types of impermeable materials. For example, overlying and/or underlying layers can be a rock, shale, levatorplasty rock or dense carbonate rocks, not leaky. In some embodiments, the implementation of heat treatment processes in-situ overlying and/or underlying layers may include containing the hydrocarbon layer or containing hydrocarbons layers that are relatively impermeable and are not exposed to temperatures during th the howling processing in-situ, which characteristics containing the hydrocarbon layer overlying and/or underlying layers vary considerably. For example, the underlying layer may contain shale or levatorplasty breed, but when carrying out heat treatment processes at the place of occurrence of the underlying layer is not heated to a temperature of pyrolysis. In some cases, the covering layer and/or underlying layers can be somewhat permeable.

"Formation fluids" are called fluids present in the formation, and they may contain fluid, the resulting pyrolysis, synthesis gas, moveable hydrocarbons and water (steam). Formation fluids may contain hydrocarbon fluids, as well as non-hydrocarbonaceous fluids. Under "moving fluid" means the fluid reservoir containing hydrocarbons, which are capable of flowing in the heat treatment of the formation. "Produced fluids" is called the fluid extracted from the formation.

"Heat source" is any system which supplies heat at least part of the reservoir, the heat is transferred mainly by radiation heat transfer and/or conductive heat transfer. For example, the heat source may contain an electric heating device, such as an insulated conductor, an elongated element and/or the conductor, on th is th in the pipe. The heat source may include systems that produce heat as a result of burning fuel out of the reservoir or in it. These systems can be external burners, downhole gas burners, flameless distributed combustors, and natural distributed combustors. In some embodiments of the invention the heat provided from one or more heat sources or produced therein, can be fed from other sources of energy. Other energy sources can directly heat the reservoir or the energy may be communicated to the transmitting medium, which directly or indirectly heats the reservoir. It is clear that one or more heat sources that bring warmth to the reservoir, can use different sources of energy. Thus, for example, for a given reservoir, some heat sources may draw heat from the resistive heaters, some heat sources may provide heat through the combustion chamber, and other sources of heat can draw heat from one or more energy sources (e.g., energy from chemical reactions, solar energy, wind energy, biomass or other renewable energy sources). The chemical reaction may include exothermic reaction (for example, the reaction of oxidized who I am). The heat source may include a heating device, which brings warmth to the area next to the heated space, such as heating the well or surrounding this place.

"Heater" is any system or heat source designed to produce heat in the wellbore or near wellbore. The heaters include, inter alia, electric heaters, burner, combustion chamber, which enters the reaction material layer or material produced in the reservoir, and combinations thereof.

By "hydrocarbon" usually refers to molecules formed mainly of carbon atoms and hydrogen. Hydrocarbons may also contain other elements, such as, for example, halogen, metal elements, nitrogen, oxygen and/or sulfur. Hydrocarbons are, for example, kerogen, bitumen, probatum, oil, natural mineral waxes and asphaltite. The hydrocarbons may be in the natural host rocks in the ground or near them. Host rocks include sedimentary rocks, Sands, silicalite, carbonate rocks and other porous media. "Hydrocarbon fluid" is a fluid containing hydrocarbons. Hydrocarbon fluids may include, to inspire or to be passionate about non-hydrocarbonaceous fluids, such as hydrogen, and the from, carbon monoxide, carbon dioxide, hydrogen sulfide, water and ammonia.

Under the "process " in situ" refers to the process of heating of a formation containing hydrocarbons, heat sources, aimed at increasing temperature, at least part of the reservoir, above the temperature of pyrolysis in order to obtain in the reservoir fluid as a result of pyrolysis.

Under the "process of heat treatment in-situ" refers to the process of heating of a formation containing hydrocarbons, using heat sources, aimed at increasing temperature, at least part of the layer above the temperature, which produces the movable fluid is easy cracking and/or pyrolysis of the material containing hydrocarbons, so that the layer produced by the moving fluid, the fluids resulting light cracking and/or the fluid resulting from the pyrolysis.

"Pyrolysis" is a break chemical bonds resulting from the application of heat. For example, the pyrolysis may include the conversion of a compound into one or more other substances by using a single heat. Warmth can be submitted to some part of the reservoir for the implementation of pyrolysis. In some layers of the reservoir and/or other materials contained in the reservoir, can contribute to the pyrolysis reaction due to the catalytic activity is I.

Under "heater with temperature limit", in General, refers to the heater, which is regulated by heat (for example, decreases the amount of heat transfer) above a certain temperature that occurs without the use of external controls, such as temperature controls, power controls, detectors, or other devices. Heaters with temperature limit can be a resistive heater AC or modulated (for example, "cut") DC.

"Thermal conductivity is a material property that describes the rate of heat transfer at steady state, between two surfaces of a material at a given temperature difference between two surfaces.

The term "borehole" means a hole in the seam made by drilling or input pipe into the reservoir. The cross-section of the wellbore may be essentially circular or any other. Here the terms "well" and "hole"when talking about the hole in the reservoir can be replaced with the term "wellbore".

Some formations containing hydrocarbons, such as layers of oil shale may contain nahcolite, throne, and/or other minerals. In some embodiments of the invention some minerals m which may be extracted from the reservoir to the use of thermal treatment on the place of occurrence with the purpose of extraction from the reservoir of hydrocarbons and other compounds.

To determine the processing area around the part of the reservoir, from which are being produced by the dissolution may be formed barrier located on the perimeter. Barrier located on the perimeter, can impede the movement of water in the treatment area. In solution mining and/or processing in-situ barrier, located on the perimeter, can impede the movement of dissolved minerals and formation fluid from the processing area. The treatment area can be heated using heat sources. During the initial heating temperature of the reservoir, which will handle may be raised to a temperature lower temperature dissociation of minerals. The temperature can be set to any value, which increases the rate of solvation of minerals in water, but which is also less than the temperature at which dissociation occurs (for nahcolite above 95°C at atmospheric pressure).

In the heated part can upload the first fluid. The first fluid may contain water, salt water, steam or other fluids, which form a solution with minerals nahcolite. The temperature of the first fluid may be higher and may be, for example, 90°, 95°, or 100°C. This elevated temperature may be similar to tempera is ur part of the layer.

In some embodiments, the first fluid is injected at an elevated temperature in the part of the reservoir that has not been heated by the heat sources. Increased temperature may be less than the boiling temperature of the first fluid, for example water to 90°C. the Flow of the first fluid at an elevated temperature increases the temperature of the reservoir. In certain embodiments of the invention from one or more sources of heat can bring additional warmth to the formation during and/or after injection of the first fluid.

In some embodiments of the invention, the first fluid is steam or contains it. Pairs can be obtained in the preceding heated part of the formation (for example, when the water passes through a u-shaped trunks wells that were used for heating the reservoir) through heat exchange with the fluids produced in the reservoir, and/or steam can be obtained in standard units produce steam. In some embodiments of the invention, the first fluid may represent a failure of the fluid pumped directly into the hot part of the specified portion of the reservoir or received in the hottest part of the reservoir. Next, the first fluid can be used as a first fluid for the extraction of dissolution.

In some embodiments of the invention the heat from the hot, the wound is heated part of the formation, use for heating water, saline water and/or steam used for extraction by dissolution in the new part of the reservoir. Heat exchange fluid may be pumped into a hot, previously processed portion of the reservoir. Heat exchange fluid may be a water, steam, carbon dioxide and/or may be a different fluid. Heat may be transferred from the hot reservoir heat exchange fluid. Heat exchange fluid extracted from the formation through production wells. The heat exchange fluid passes through the heat exchange device. Heat exchanger can heat water, salt water and/or steam is used as the first fluid for extraction by dissolution in the new part of the reservoir. Heat exchange fluid may be re-injected into the heated part of the reservoir for more hot heat exchange fluid. In some embodiments of the invention, the heat-exchange fluid produced from a formation process for the extraction of hydrocarbons or other materials before re directed into the reservoir that is done as part of the recovery process, the heated part of the formation.

The temperature of steam injected for extraction by dissolution, may be less than the temperature pyrolysis of hydrocarbons from the reservoir. The temperature of the injected steam may be less than 250°C, 300°C or less than 400°C. the Temperature is antaimoro pair may be at least 150°C., at least 135°C., or at least 125°C. the Pressurized steam having a temperature of pyrolysis, can cause problems, because the hydrocarbons are involved in the reaction of pyrolysis and particles of hydrocarbons mixed with steam. The mixture of particles and vapor can reduce the permeability and/or to cause plugging of wells and reservoir. Thus, the temperature of the injected steam is chosen in such a way as to prevent clogging of the reservoir and/or wells in the reservoir.

The temperature of the first fluid can be changed during the process of extraction by dissolution. During extraction by dissolution and further minerals produced by dissolving, from the point of discharge, the temperature of the first fluid can be increased so that the temperature of the steam and/or water, which comes to mineral extracted by dissolution, increased, but its value does not exceed the temperature of dissociation of nahcolite. The temperature of the steam and/or water, which comes to mineral, also less temperature, which contributes to the clogging of the formation and/or borehole in a formation (e.g., temperature pyrolysis of hydrocarbon reservoir).

After discharge of the first fluid into the reservoir from it, you can get a second fluid. The second fluid may contain material that is dissolved in the first fluid. For example, vtoro the fluid may contain carbon dioxide or other hydrated carbon compounds obtained by dissolving the mineral in the first fluid. The second fluid may contain minerals and/or metals. Minerals and/or metals may contain sodium, aluminum, phosphorus and other elements.

Carrying out the extraction by dissolving before the heat treatment process in-situ allows you to perform the initial heating of the reservoir through heat transfer from the first fluid used in solution mining. The solution mining of nahcolite or other minerals that decompose or dissolve during endothermic reactions to the process of heat treatment on the place of occurrence, lets not bring energy to warm the reservoir to maintain these endothermic reactions. The solution mining allows you to extract minerals it is advisable from an economic point of view. Removing nahcolite or other minerals before heat treatment process in-situ removes mass from the reservoir. Thus, in the reservoir remains less than the mass that must be heated to higher temperatures, and heating the layer to high temperatures can be achieved faster and/or more efficiently. Also removing mass from the reservoir can increase the permeability of the formation. The increase in permeable whom t may reduce the number of producing wells, necessary for carrying out the process of heat treatment on the place of occurrence. In certain embodiments of the invention carrying out the extraction by dissolution to the curing process, in-situ reduces the time delay between the start of heating of the reservoir and production of hydrocarbons in two years or more.

Order produced many different products of the hydrocarbons in the reservoir can be treated in different ways. In some embodiments of the invention the hydrocarbon reservoirs are processed in stages. Figure 1 shows the stages of the heat of formation containing hydrocarbons. Figure 1 also shows the dependence of the number ("Y") oil equivalent barrels per tonne (y axis) of formation fluids produced from the reservoir, the temperature (T) of the heated layer in Celsius degrees (x axis).

When carrying out step 1 of heating occurs desorption of methane and water evaporation. The heating layer in step 1 can be performed as quickly as possible. For example, when a formation containing hydrocarbons, initially heated, the hydrocarbons in the reservoir was stripped of adsorbed methane. From the reservoir can be extracted desorbed methane. If you continue to heat the reservoir containing hydrocarbons, water from a reservoir containing hydrocarbons to evaporate. In some containing hydrocarbon reservoir is x water can take from 10% to 50% of the pore volume of the reservoir. In other reservoirs, the water is more or less of the pore volume. Typically, the water in the reservoir evaporates at a temperature of from 160°C to 285°C at an absolute pressure of 600 kPa to 7000 kPa. In some embodiments of the invention the evaporated water changes the wettability of the reservoir and/or increases the pressure in the reservoir. Wettability alteration and/or increased pressure can affect the reactions of pyrolysis or other reactions in the reservoir. In some embodiments of the invention the evaporated water is extracted from the reservoir. In other embodiments the invention, the evaporated water is used for extraction of steam and/or distillation in a seam or out-seam. The removal of water from the reservoir and increase the pore volume of the reservoir increases the space for storage of hydrocarbons in the pore volume.

In some embodiments of the invention after a stage 1 heating is further heated reservoir, so that the temperature in the reservoir reaches (at least) the temperature of the beginning of pyrolysis (such as the temperature at the lower end of the range of temperatures of phase 2). During phase 2 of the hydrocarbons in the reservoir can be subjected to pyrolysis. The temperature range of the pyrolysis varies depending on the type of hydrocarbon in the reservoir. The temperature range of the pyrolysis can be from 250°C. to 900°C. the Range of temperature is ur pyrolysis to obtain a desired product may be only part of the overall temperature range of the pyrolysis. In some embodiments of the invention the temperature range of the pyrolysis to obtain a desired product can be from 250°C to 400°C or 270°to 350°C. If the temperature of the hydrocarbons in the reservoir grows slowly in the range from 250°C to 400°C, then the pyrolysis products can essentially be completed at the approach of the temperature to 400°C. the Average temperature of the hydrocarbons can grow with a speed of less than 5°C per day, less than 2°C per day, less than 1°C per day, or less than 0.5°C on the day, while in the temperature range of the pyrolysis needed to obtain the desired products. Heat containing hydrocarbons of the reservoir several sources of heat can set the temperature around sources of heat, whereby the temperature of the hydrocarbons in the reservoir rises slowly in the temperature range of the pyrolysis.

The rate of increase of temperature in the temperature range of the pyrolysis aimed at the formation of the desired products can affect the quality and quantity of fluids extracted from the containing hydrocarbons of the reservoir. Slow increase of the temperature in the temperature range of the pyrolysis aimed at the formation of the desired products may inhibit the mobility of molecules with large chains in the reservoir. Slow increase of the temperature in the temperature range of the pyrolysis, the direction is Noah on the formation of the desired products, may limit the reaction between the movable hydrocarbons, which are obtained unwanted products. Slow increase of the temperature of the layer in the temperature range of the pyrolysis aimed at the formation of the desired products, it may be possible to extract from a layer of high-quality hydrocarbons, with high density, measured in degrees American petroleum Institute. Slow increase of the temperature of the layer in the temperature range of the pyrolysis aimed at the formation of the desired products, it may be possible to extract a large amount of hydrocarbons present in the reservoir, as the hydrocarbon product.

In some embodiments, the implementation of heat treatment on the place of occurrence instead of slowly heated in the desired range of temperature to the desired temperature of the heated portion of the formation. In some embodiments of the invention the desired temperature is 300°C., 325°or 350°C. as the desired temperature can be selected different values of temperature. The imposition of heat from the heat sources can be relatively quickly and efficiently installed in the reservoir to the desired temperature. You can adjust the summed energy into the formation from the heat sources to maintain essentially the desired temperature in the reservoir. Essentially, the desired value of the rate is atory heated part of the formation is maintained until while the pyrolysis reaction will not weaken so that the production of desired fluids from the reservoir will not be economically disadvantageous. Part of the layer subjected to the pyrolysis reaction may include areas whose temperature is in the temperature range of the pyrolysis due to heat transfer from only one source of warmth.

In some embodiments of the invention extracted from the reservoir formation fluids, including fluids resulting from pyrolysis. With increasing reservoir temperature may decrease the amount of condensable hydrocarbons in the produced formation fluids. At high temperatures from the reservoir can be extracted mainly methane and/or hydrogen. When heated, containing hydrocarbons of the reservoir throughout the temperature range of the pyrolysis of the formation may produce only small amounts of hydrogen when approaching the upper limit of the temperature range of the pyrolysis. After exhausting all of the available hydrogen is usually from the reservoir can be extracted from the minimum amount of fluids.

After pyrolysis of the hydrocarbons in the reservoir may still be present a large amount of carbon and some hydrogen. A significant portion of the carbon remaining in the reservoir can be extracted from the reservoir in the form of synthesis gas. The formation of synthesis gas may occur during stage 3 heat the Oia, depicted in figure 1. Stage 3 may include a heat containing hydrocarbons of the formation to a temperature sufficient to produce synthesis gas. For example, synthesis gas may be produced in the temperature range from about 400°to about 1200°C.; from about 500°to about 1100°C., or from about 550°to about 1000°C. When the fluid to produce synthesis gas into the formation, the temperature of the heated portion of the formation determines the composition of synthesis gas produced in the reservoir. The resulting synthesis gas can be extracted from the reservoir by the producer or producing wells.

The full energy content of fluids produced from containing a hydrocarbon reservoir may remain relatively constant throughout the pyrolysis process and the formation of synthesis gas. During the flow of pyrolysis at relatively low temperatures, a significant part of the produced fluid can be a condensable hydrocarbons, which are characterized by high energy intensity. However, at temperatures exceeding the temperature of pyrolysis, the lower part of the formation fluid may be a condensable hydrocarbons. From the reservoir can be extracted more non-condensable fluids. The energy per unit volume of produced fluid may slightly decrease when obtaining mainly neko is generousity reservoir fluids. When receiving the synthesis gas, the energy per unit volume of the produced synthesis gas is significantly reduced compared to the intensity of the fluid resulting from pyrolysis. However, the volume of produced synthesis gas in many examples is greatly increased, thereby compensating reduced energy consumption.

Figure 2 shows a schematic view of a variant of implementation of the part of the system of heat treatment on the place of occurrence designed to handle containing a hydrocarbon reservoir. The system of heat treatment on the place of occurrence may contain barrier wells 200. Barrier wells used for the formation of a barrier around the processing area. The barrier prevents the flow of fluid into the treatment area and/or out of it. Barrier wells include, among other things, dewatering wells, well create a vacuum wells to collect, injection wells, wells for the fill solution, freezing of wells or a combination of both. In some embodiments of the invention the barrier wells 200 represent the dewatering wells. Dewatering wells may remove liquid water and/or to prevent the penetration of liquid water in the heated part of the reservoir or in a heated reservoir.

Freeze wells may be used to establish a zone of low temperature is atory around the entire processing or her part. For the formation of low temperature areas around each freeze well in them circulates the refrigerant. Freezing so well located in the reservoir, that the area of low temperature to overlap and form a low temperature area around the processing area. Temperature zone to the low temperature set freeze wells is maintained below the freezing temperature of water fluid reservoir. Water fluid flowing in the low temperature area, freezes and forms a frozen barrier. In the embodiment of the invention figure 2 shows the barrier wells 200, located only along one side of the source 202 of the heat, but usually the barrier wells are surrounded by all sources 202 of heat used or planned to be used for heating the processing layer.

Sources 202 warmth are at least in part of the reservoir. Sources 202 warmth can be a heating device such as insulated conductors, a heating device with a conductor within the tube flameless burners, flameless distributed combustor and/or natural distributed combustor. Sources 202 warmth can also be a heating device of other types. Sources 202 of the heat supply heats the, at least part of the reservoir for heating the hydrocarbon reservoir. Energy may be supplied to the source 202 of warmth along the lines 204 power. Line 204 power can constructively vary depending on the type of source of heat or sources of heat used for heating the reservoir. Line 204 supply to the heat sources can transmit electricity to the electric heating device can transport the fuel to the combustion chambers or can move the heat-transfer fluid circulating in the reservoir. In some embodiments of the invention electricity for process heat treatment at the place of occurrence may be supplied by a nuclear power station or nuclear power plants. The use of nuclear energy may allow you to reduce or completely eliminate the carbon dioxide emissions during the curing process in-situ.

Production wells 206 are used to remove formation fluid from the reservoir. In some embodiments of the invention production well 206 may contain a source of heat. The source of heat located at the production wells, can heat one or more parts of the reservoir to the production well or close to it. In some embodiments, the process of heat treatment on the place of occurrence of the number of heat applied to the formation from the production well, per meter length of the production well is less than the amount of heat supplied to the reservoir from a source of heat which heats the reservoir, a meter source of warmth. The heat applied to the formation from the production well, can increase the permeability of the formation near the mining well due to the vaporization and removal of the liquid phase of the fluid near the mining well and/or by increasing the permeability of the formation near the mining well, which is a consequence of the formation of macro - and microcracks.

In some embodiments of the invention the source of heat in the production wells 206 allows you to extract steam from the reservoir phase fluids. The supply of heat to the producer or the producer may: (1) to prevent condensation and/or reverse flow of the produced fluid, when such extracted fluid is moved into the production wells close to the covering layer (2) to increase the supply of heat into the reservoir, (3) increase the rate of production of the production well compared to extractive well without a source of heat, (4) to prevent condensation of compounds with a large number of carbon atoms (C6and more) at the production wells and/or (5) increase the permeability of the formation from the production well or close to it.

Underground pressure vplate can match the pressure of the fluid in the reservoir. When the temperature in the heated part of the formation increases, the pressure in the heated part may increase as a result of increased production of fluids and water evaporation. Control of the rate of extraction of fluids from the formation may allow to control the pressure in the reservoir. The pressure in the reservoir can be defined in several different places, for example near producing wells or near sources of heat or they, or the control wells.

In some containing hydrocarbon reservoirs hydrocarbon production from the formation is restrained up until at least some hydrocarbons of the reservoir is not subjected to pyrolysis. Wireline fluid can be extracted from the reservoir when the reservoir quality of the fluid corresponds to the selected level. In some embodiments of the invention the selected quality level is the density in degrees American petroleum Institute (API), which is at least about 20°, 30° or 40°. Ban on production up until at least some hydrocarbons were not subjected to pyrolysis, can increase the conversion of heavy hydrocarbons into light hydrocarbons. Ban on production in early may minimize the production of heavy hydrocarbons from the reservoir. Production of significant amounts of heavy hydrocarbons can potrebbe the TB expensive equipment and/or reduce the life of the production equipment.

After reaching the temperature of pyrolysis and resolution of production from the reservoir pressure in the reservoir can be changed to modify and/or control the composition of the extracted formation fluid to regulate the percentage of condensable fluid is relatively non-condensable fluid in reservoir fluid and/or for the regulation of density in degrees ANI produced formation fluid. For example, the reduction of pressure can lead to the extraction of a bigger share of the condensable component of the fluid. Condensable component fluid may contain a higher percentage of olefins.

In some embodiments, the process of heat treatment on the place of occurrence of the pressure in the reservoir can be maintained sufficiently high to facilitate the extraction of formation fluid with a density of more than 20° in degrees ANI. Maintaining high pressure in the reservoir can inhibit subsidence of the formation during heat treatment in situ. Maintaining the increased pressure may lead to the production of vapor phase fluid from the reservoir. Extraction steam phase from the reservoir may allow to reduce the size of the collecting pipes used for conveying fluids produced from the reservoir. Maintaining the increased pressure can reduce or eliminate the need for compression of reservoir fluids to the surface for the purpose of transporting the of widow pipes to treatment plants.

It is surprising, but maintaining a high pressure in the heated portion of the formation may allow to produce large amounts of hydrocarbons of improved quality and relatively low molecular weight. The pressure can be maintained in such a way that the extracted wireline fluid contains the minimum number of compounds in which the carbon number exceeds a selected carbon number. Selected carbon number can be at most 25, most 20, at most 12, or at most 8. Some compounds with a large carbon number can be captured in the reservoir by steam and can be extracted from the reservoir with steam. Maintaining high pressure in the reservoir may prevent the capture of ferry connections with a large carbon number and/or polycyclic hydrocarbon compounds. Connection with a large carbon number and/or polycyclic hydrocarbon compounds may remain in the reservoir in the liquid phase over a significant period of time. These significant periods of time can provide a sufficient amount of time for the pyrolysis of compounds with the aim of obtaining compounds with a lower carbon number.

Wireline fluid extracted from production wells 206 may be pumped by collecting pipe 208 to the processing units 210. Also formation fluids m which may be obtained from sources 202 warmth. For example, the fluid may be extracted from a source 202 of heat to regulate the pressure in the reservoir near sources of heat. The fluid extracted from sources 202 of heat can be pumped through a pipe or pipeline to the collecting pipe 208 or the extracted fluid can be pumped through a pipe or pipeline directly to the processing units 210. Accessories installation 210 may contain units separation of units carrying out reactions, concentration units, fuel cells, turbines, storage containers and/or other systems and units, designed to handle fluids. In manufacturing plants, at least part of the hydrocarbons produced from the formation may be produced transportation fuels. In some embodiments the invention, the fuel may be a reactive fuels, such as JP-8.

Hydrocarbons and other products of the reservoir can be produced using various processes carried out in-situ. Some of the processes that are carried out in-situ and which can be used for the production of hydrocarbons or the right products represent the conversion processes carried out at the place of occurrence: the injection of steam into the reservoir, creating a reservoir of a moving hearth burning, grav is the second drainage at the injection of steam and production of dissolution. When making processes at the place of occurrence may be necessary or may be required barriers. Barriers may prevent fluid, such as a wireline fluid to enter the processing area. The barriers can prevent unwanted release of the fluid from the processing area. Preventing unwanted release of fluid from the area of treatment can minimize or eliminate the impact of the process carried out at the place of occurrence, the area adjacent to the processing area.

In some embodiments of the invention barriers form at a considerable distance from wells used for heating or other processing processing. The barrier can be formed at a distance of

10 m, 30 m, 50 m, 100 m, and then from wells used for heating or other processing processing.

The heat treatment processes at the place of occurrence and extraction by dissolution can heat the treatment area, to remove a lot of processing and significantly increase the permeability of the processing area. In some embodiments of the invention the permeability of processing after processing may be at least 0,1 D. In some embodiments of the invention the permeability of processing after processing may be at least 1 is, at least 10 L, at least 100 Days Increased permeability allows fluid in the reservoir to penetrate into cracks, microcracks and/or the pore space of the reservoir. Outside the field of processing permeability may remain at the initial level. Increased permeability allows uploaded the lighter fluid flow in the reservoir.

In certain embodiments of the invention barriers in the reservoir can be formed after the process of extraction by dissolution and/or heat treatment process in-situ, with the formation of a barrier is performed by injection of fluid into the reservoir. The barrier may prevent Plast fluid to flow into the treatment area after the end of production by the dissolution and/or heat treatment process in-situ. The barrier formed by the injection of fluid into the reservoir, can provide an opportunity to isolate the treatment area.

The fluid pumped into the formation to form a barrier, can contain a mixture of solid hydrocarbons, bitumen, crude oil, sulfur, polymer, gel, saturated salt solution and/or more reagents involved in the reaction for the formation of precipitated precipitated solid or high-viscosity fluid in the reservoir. In some embodiments of the invention the bitumen, crude oil, reagents and/or the EPA, used to build the barrier, delivered from processing facilities associated with the process of heat treatment on the place of occurrence. For example, sulfur can be obtained from the Claus process is used to process the extracted gases to remove hydrogen sulfide and other sulfur compounds.

The fluid may be injected into the reservoir in the form of liquid, vapor or fluid mixed phases. The fluid may be pumped into the part of the reservoir, the temperature of which is raised. In some embodiments of the invention the fluid into the formation in wells located near the perimeter of the processing area. The fluid can be directed from the processing area. High temperature reservoir maintains a low viscosity fluid or allows the fluid to maintain low viscosity to the fluid moved from the well. Part of the fluid may be distributed in the layer outwards, towards the colder part of the reservoir. The relatively high permeability allows fluid pumped from one well bore, distributed and mixed with the fluid pumped from other boreholes. In colder parts of the reservoir, the viscosity of the fluid greater part of the fluid precipitates and/or fluid hardens or is condensed, so that the fluid forms a barrier to the flow of formation fluid into the treatment area or of n is E.

In some embodiments of the invention, a low temperature barrier formed by freeze wells surrounds the treatment area or part of the processing area. When the fluid injected into the reservoir, is approaching a low-temperature threshold, the temperature of the reservoir is reduced. Lower temperature increases the viscosity of the fluid increases the precipitation and/or solidification of the fluid, forming a barrier to the flow of formation fluids moving in the reservoir or from it. After dispersion of the low-temperature barrier fluid may remain in the reservoir as fluid is a high viscosity or solid.

In certain embodiments the invention, the saturated salt solution into the formation. Components of a saturated salt solution may precipitate from the solution by lowering its temperature. The hardened particles can form a barrier to the flow of formation fluids into the reservoir or from it. Hardened components, essentially, may be insoluble in the reservoir fluid.

In certain embodiments of the invention in the reservoir as a reagent pump salt water. The second reagent, such as carbon dioxide may be injected into the reservoir for entering into the reaction with mineralized water. The result of this reaction can be obtained mineral is the complex compound which increases in the reservoir. Mineral compound may be essentially insoluble in the reservoir fluid. In one embodiment of the invention a concentrated salt solution comprises a solution of sodium and aluminum. The second reagent is injected into the reservoir, is carbon dioxide.

Carbon dioxide reacts with a concentrated salt solution with the aim of obtaining dawsonite. Minerals can harden and form a barrier to flow of formation fluid into the reservoir or from it.

In some embodiments of the invention the barrier around the area of treatment can be formed using sulfur. It is advisable to free sulfur was not soluble in water. Liquid and/or solid sulfur in the reservoir may form a barrier for formation fluid flowing in the processing area or out of it.

The barrier of sulfur can be installed in the reservoir during the beginning of the heating or prior to the heating processing, the specified heating is carried out in the course of thermal processing on the place of occurrence. In some embodiments the invention, the sulfur can be injected into the trunks of wells in the reservoir, which is located between the processing area and the first barrier (for example, a low temperature barrier established by using freezing the well is). The formation adjacent to the well holes, which are injected sulfur, can be drained. In some embodiments of the invention the formation adjacent to the well holes, which are injected sulfur, can be heated to facilitate the extraction of water and preparation of all wells and adjacent the reservoir to the injection of sulfur. The formation adjacent to the well holes, can be heated to the temperature lower temperature pyrolysis of hydrocarbons from the reservoir. The reservoir can be heated so that both adjacent heating device affect the temperature of the reservoir between the two heating devices. In some embodiments of the invention, the heat can increase the permeability of the formation, the first borehole will be communicated with the adjacent wellbore.

After heating the formation adjacent to the well holes, molten sulfur at a temperature lower temperature pyrolysis of hydrocarbons from the formation into the formation. In a certain temperature range, the viscosity of molten sulfur increases with temperature. The temperature of the molten sulfur injected into the reservoir, may be close to the melting point of sulfur (115°C), so that the viscosity of sulfur is relatively small (4·10-3- 1·10-2PA·s). A heating device the borehole mo the ut to be heating devices limit working temperature Curie temperature, close to the melting point of sulfur, so that the temperature of the molten sulfur remains relatively constant and does not exceed the temperature of the formation with a viscous molten sulfur. In some embodiments of the invention, the area adjacent to the trunks of the wells can be heated to a temperature which exceeds the melting point of sulfur, but less than the temperature of the pyrolysis of hydrocarbons from the reservoir. The heating device can be turned off and you can monitor the temperature of the borehole (e.g., using fiber-optic temperature monitoring systems). When the temperature in the wellbore decreases to the temperature close to the melting point of sulfur, molten sulfur can be injected into the formation.

Sulfur injected into the reservoir to allow flow from boreholes and distributed throughout the layer. When sulfur will fall in parts of the reservoir, the temperature of which is below the melting temperature, sulfur hardens and forms a barrier to fluid flow in the reservoir. Sulfur can upload up until the reservoir is able to accept additional amount. Heating may be stopped and the reservoir may be given the opportunity to cool off in a natural way, so that the sulfur in the reservoir will harden. After injection of sulfur can be verified the integrity of the formed barrier using p is overat by applying pulses and/or tests with labeled atoms.

After the curing process, in-situ around the area of treatment can be formed barrier. Sulfur can form an essentially continuous barrier layer. In some embodiments of the invention, a low temperature barrier can be created by the freezing of wells surrounding the treatment area. Sulfur can be pumped from one side of the low-temperature barrier or both sides of the barrier to form a barrier in the reservoir. Sulfur can be injected into the reservoir in the form of steam or liquid. When approaching sulfur to low-temperature barrier sulfur in the reservoir can condense and/or solidify, and form a barrier.

In some embodiments of the invention, the sulfur can be pumped into the heated part of the formation. Sulfur can be injected into the reservoir through the wells located near the perimeter of the processing area. The temperature of the reservoir may be higher than the evaporation temperature of sulfur (445°C). Sulfur can be injected in the form of liquid, vapor or fluid of the mixed phases. If a portion of the injected sulfur is in a liquid state, because the temperature of the reservoir sulfur can evaporate. Sulfur can flow outward from the wells to pump towards the colder parts of the reservoir. Sulfur can condense and/or solidify in the reservoir and to form BA the er.

In some embodiments of the invention for sulfur after the process of heat treatment on the place of occurrence may be used in the Claus reaction. The Claus reaction is the reaction equilibrium to the gaseous phase. The Claus reaction is as follows:

4H2S+2SO2↔3S2+4H2O.

The hydrogen sulfide can be obtained through its separation from the produced fluid at a continuous heat treatment process in-situ. Part of the hydrogen sulfide can be burned to produce the desired amount of sulfur dioxide. Hydrogen can be injected into the reservoir for several wells in the reservoir. Sulfur dioxide can be injected into the reservoir for other wells. In the implementation process of heat treatment processing in-situ wells used for injection of sulfur dioxide or hydrogen sulfide may be the producing wells, heater wells, test wells or wells of other types. Wells used for injection of sulfur dioxide or hydrogen sulfide, can be located near the perimeter of the processing area. Several wells may be sufficient for the formation near the injection wells are not cooled to the temperature when sulfur dioxide and hydrogen sulfide can form sulfur and condensate, and not about the stay in the vaporous state. In some embodiments of the invention, the hydrogen sulfide and sulfur dioxide can be injected into the formation through the same well (for example, pipes that are located in the same well). The hydrogen sulfide and sulfur dioxide can enter the reservoir in response to sulfur and water. Sulfur can flow in the reservoir out and condense and/or solidify to form a barrier in the formation.

The barrier of sulfur can be located in the reservoir outside of the region where the layer of condensed hydrocarbons, formation fluids, obtained by carrying out the heat treatment process. The temperature of the areas located near the perimeter of the treated area may be less than the temperature of the treated area. Sulfur, in the form of vapour can condense and/or solidify in these areas of low temperature. In these areas of low temperature can get an additional amount of hydrogen sulfide and/or sulfur dioxide. An additional amount of sulfur can be formed due to the Claus reaction and to maintain the equilibrium concentration of sulfur in the vapor phase. Ultimately, the barrier of sulfur can be formed around the treated area. Vapor phase in the treated area remains in an equilibrium mixture of sulfur, hydrogen sulfide, sulfur dioxide, water vapor. Also in the vapor phase can in order to contain other gaseous products, present in the reservoir or discharged from the reservoir.

The conversion of sulfur is preferably carried out at low temperatures, so that the conversion of hydrogen sulfide and sulfur dioxide in the sulfur can be carried out at a distance from wells where the reservoir is injected reagents. The Claus reaction can be carried out in the reservoir sulfur, where the temperature of the reservoir is smaller (for example, where the temperature of the reservoir is approximately 180°to approximately 240°C).

In the light of the present description specialists in this field can be clear additional modifications and alternative embodiments of various aspects of the present invention. Accordingly, this description should be considered only as an illustration and it is given for the purpose of training specialists in the field of General implementation method of this invention. It is clear that shown and described herein forms of the invention should be considered as preferred in the present embodiments of the invention. Shown and described herein items and materials can be replaced, parts and methods can be changed and some features of the invention can be used independently, that is clear to the expert in this field after understanding the description of the present invention. In the described elements of m which may be amended, not beyond the scope and novelty of the invention, which are described in the accompanying claims. In addition, it is clear that is described here is independent distinctive features can be combined in some embodiments of the invention.

1. Method of forming a barrier around at least part of the processing of an underground reservoir, comprising the steps are:
inject sulfur in one or more boreholes located inside the perimeter of the processing in the reservoir, the permeability of the processing is at least 0.1 D; and
provide the ability to move at least part of the sulfur in the direction of parts of the reservoir, the temperature of which is less than the melting point of sulfur, so sulfur hardened in the reservoir and formed a barrier,
this area, adjacent to the trunks of the well is heated to a temperature higher than the melting point of sulfur, but less than the temperature of the pyrolysis of hydrocarbons, after which the heating is stopped for a cooling layer in a natural way, so that the sulfur in the hardened layer.

2. The method according to claim 1, in which the permeability of the processing is at least 1 day

3. The method according to claim 1, in which the permeability of the processing is at least 10 Days

4. The method according to claim 1, in which the permeability of the area of the processing is at least 100 Days

5. The method according to any one of claims 1 to 4, in which the permeability of the processing is increased through a process of extraction of dissolution.

6. The method according to claim 1, in which the permeability of the processing is increased through a process of heat treatment on the place of occurrence.

7. The method according to claim 1, in which the injection of at least part of the sulfur in one or more boreholes includes the introduction of hydrogen sulfide and sulfur dioxide in the trunks of wells, while the hydrogen sulfide and sulfur dioxide react in the reservoir with the formation of sulphur.

8. The method according to claim 1, in which at least a portion of sulfur injected into the trunks of wells is in a liquid state.

9. The method according to claim 8, in which liquid sulphur evaporates due to the heat reservoir, adjacent to the trunks of the well.

10. The method according to claim 1, in which at least a portion of sulfur injected into the trunks of wells is in the vapor phase.

11. The method according to claim 1, in which the sulfur stream is directed to the perimeter of the area to be processed.

12. The method according to claim 1, in which the trunks of wells in which the sulfur is injected into the reservoir, are located near the perimeter of the area to be processed.

13. The method according to claim 1, in which the low-temperature barrier at least partially surrounding the treatment area, improves the sulfur solidification with the formation of the barrier.

14. The method of forming the barrier layer is, comprising the steps are:
heated portion of the formation adjacent to the set of all wells to raise the temperature of the formation near the well holes to values exceeding the melting point of sulfur, but less than the temperature of the pyrolysis of hydrocarbons in the reservoir;
introduce sulfur into the reservoir from at least some boreholes; and
provide the ability sulfur move from boreholes in the direction of parts of the reservoir, the temperature of which is less than the melting point of sulfur, so sulfur hardened in the reservoir and formed the barrier.

15. The method according to 14, in which the introduction of sulfur into the reservoir includes the supply of hydrogen sulfide and sulfur dioxide into the reservoir so that at least a certain amount of hydrogen sulfide and sulfur dioxide were entered into the formation to react with sulphur.

16. The method according to any of PP and 15, in which at least one heater is used for heating of the reservoir adjacent to the trunks of the well, contains a heater with a temperature limit.

17. The method according to 14, further including solution mining processing inside the barrier.

18. The method according to 14, further comprising using the heat treatment process is in-situ in the processing inside the barrier.

19. The method according to 14 additionally comprising forming MC is related barrier between the first barrier and the processing area, used for extraction of formation fluid from the formation.

20. The method according to 14, in which the sulfur input into the reservoir includes the injection of the molten sulfur reservoir, at least, several trunks wells.



 

Same patents:

FIELD: gas and oil production.

SUBSTANCE: ecologically pure not hardening pill is used for tamping annular space of casing string. Spherical cavities uniformly distributed by volume are arranged in the pill. Also, mechanical matrixes are tempered in a not yet hardened pill. Matrixes consist of an internal part with closed porosity and an external part with open porosity at ratio of corresponding volumes of parts within range from 90:10 to 99:1. Application of non-hardening pill instead of not freezing one prevents drinkable water bearing horizons from hydrocarbon impurities.

EFFECT: application of matrix of cheap foam glass in non-hardening pill instead of use of expensive refrigerating installations, thermostats and double casings in surface equipment and in structure of direction and conductor of hole.

3 cl

FIELD: gas and oil production.

SUBSTANCE: procedure consists in lowering string into well into zone of water inflowing pay, in pumping backfilling solution prepared of bitumen with filler through string into well and in forcing string through into water inflowing pay. Also, as filler there is used cement and additionally high viscous bitumen at amount of 5-20 wt % or high viscous oil of volume of bitumen-cement solution determined depending on a geologic-physical characteristic of the pay. Before pumping into the well and depending on occurrence depth of the water inflowing pay backfilling solution is heated to temperature as high, as 70-80°C. Solution is pumped through the string of heat insulated pipes under the mode of alternating pressure at maximal pressure not exceeding pressure of hydraulic outbreak above the located pay. Also, after water insulating operations production of the pay is withdrawn in a cyclic mode with start up into operation for 2-3 days and shut down for the same time as many as three times, if intake capacity of the pay exceeds 500 m3/day.

EFFECT: improvement of procedure.

5 cl, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for restraint of water production in well consists in pumping solution of CL (cultural liquid) into insulated interval. Two equal portions are pumped. The first portion corresponds to solution of CL prepared on soft water of 1000 kg/m3 density at ratio 1:0.5-1, while the second one corresponds to solution prepared on reservoir mineralised water of density up to 1190 kg/m3 at ratio 1:0.3-0.5.

EFFECT: raised efficiency of repair-insulation operations due to creation of more resistant to water outbreak screen of water solutions of silicon-organic liquid - CL with controlled period of gelation excluding their preliminary hardening.

3 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure consists in simultaneous effecting permeable walls of well borehole with scrapers for removal of filtration crust and with high-pressure jets generated from hydro-monitored heads of mud injector during well bottom hole deepening with drilling. Also, hydro-jets are directed at angle towards each other, they converge at one point on the wall of the well and destroy their nuclei, thus preventing destruction of walls of the well and formation of cavities. Well walls are subjected to the similar effect when the well is treated before lowering a producer for cementing. Drill agent containing dispersed solid particles is used as fluid for high-pressure hydraulic jets.

EFFECT: raised efficiency of mud fill, reduced expenditures for emergency-recovery operations and time for construction of well.

2 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: composition contains carbamide-formaldehyde resin, acid hardener and filler. As hardener there is used resorcin and ferro-chrome-lignosulphonate, and as filler there is used carbon white CW-120 or talk, or rubber powder, or chalk at the following ratio of components, in weight shares: carbamide-formaldehyde resin 100; resorcin 7-15, ferro-chrome-lignosulphonate - FCLS-M 1.5-25, filler 3-8.

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2 cl, 1 tbl, 20 ex

FIELD: oil and gas production.

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2 cl, 3 tbl, 11 ex

FIELD: oil and gas industry.

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EFFECT: increasing efficiency of isolation works.

3 ex

FIELD: oil and gas production.

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17 cl, 7 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for insulation of water production in well consists in successive pumping sodium silicate and 5-15% solution of fluorosilicate ammonia in equal volumes through a buffer of fresh water into a required interval of insulation.

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2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method for limiting water influx in well involves subsequent pumping to isolated interval of invert emulsion on the basis of water disperse phase and hydrocarbon disperse medium with organic silicone backfill compound and fixing agent on the basis of organic silicone backfill compound in higher concentration. Before invert emulsion to isolated interval there pumped is water suspension of clay to increase viscosity and stability of emulsion, as organic silicone backfill compound there used is Silor NCh; at that, for invert emulsion in quantity of 1-10% of volume of hydrocarbon dispersion medium, and for fixing agent - with addition of 10% water solution of sodium hydroxide at the following ratios of components, vol. %: organic silicone backfill compound "Silor NCh" 80-90; 10% water solution of sodium hydroxide 20-10.

EFFECT: increasing efficiency of insulating works, duration of effect, increasing overhaul period of operation, excluding metal corrosion of tubing string and production casing.

2 tbl, 1 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to grouting mortars used for cementing casing pipes of gas, gas-condensate, and oil wells complicated by presence of formations with low hydraulic rupture pressure as well as presence of permafrost rocks. Light-weight grouting mortar contains 47.0-60.0% special-type cement, 6.6-11.8% clinoptilite as light-weight additive, and water. As a result, casing-pipe annulus incidents during boring and running wells are avoided owing to improved parameters of grouting cement, in particular increased sedimentation stability of mortar, dimensional stability and needed strength of cement stone at low positive and negative temperature in early hardening stages are achieved at simultaneous lowering of grouting mortar density.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

FIELD: oil and gas chambers construction.

SUBSTANCE: method includes pumping of portion of water-absorbing acryl polymer, exposure of it in a well, pumping of second portion of same polymer, tempered on fresh water with concentration 1-20%, buffer of fresh water dries up, and before and after pumping of second portion of water-absorbing polymer, tempered on hydrocarbon liquid with concentration 10-20%, buffer of hydrocarbon liquid is pumped in, besides, said 2-portion systems are pumped into well multiple times.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides grouting composition intended for selective insulation of water inflows into wells, including those occurring under low-temperature and high-permeation oil reservoirs, as well as for suppressing lost-circulating zones and brine inflow zones. Composition including product of hydrolytic etherification of chlorine-containing phenyltrichlorosilane still residues with aqueous alcohol solution contains, more specifically, product obtained by hydrolytic etherification of 100 wt parts of indicated residues with 10-32,8 wt parts of 90-93% aqueous alcohol solution in presence of 10-40 wt parts of orthosilicic acid ethyl ester and, additionally, 15-35 wt parts of chlorine-containing phenyltrichlorosilane still residues at summary content of the two components 133.2-161.6 wt parts. Grouting composition may further contain up to 16.8 wt parts of polar solvent.

EFFECT: lowered repair operation cost, enabled utilization in a wide formation temperature range, including that in high-permeation and low-temperature oil reservoirs, and prolonged shelf time of grouting composition.

2 cl, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

Plugging mix // 2245989

FIELD: oil and gas production.

SUBSTANCE: plugging mix intended for cementation of oil, gas, and gas condensate wells under moderate and elevated temperatures contains 50-76% Portland cement, 20-40% finely ground quartz, and caustic magnesite powder.

EFFECT: reduced filtration and shrinkage of plugging mortar.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: Portland cement-based composition contains, wt %: polymer 1-10, hardening accelerator 6-8. plasticizer 0.3-0.5, alumina cement 7-10, gypsum dihydrate and/or anhydrite 5-8, said polymer being selected from the group comprising: polyacrylamide, hydrolyzed polyacrylonitrile, polyvinyl alcohol, organosilicon liquid, latex and cationic bitumen emulsion, and said hardening accelerator being alkali or alkali-earth metal sulfates or chlorides.

EFFECT: improved properties, reduced shrinkage deformations, and under conditions resistance to fissuring.

2 cl, 2 tbl

FIELD: mining engineering, in particular improving of reservoir recovery.

SUBSTANCE: claimed composition contains (mass parts): resin 100; liquid curing agent (e.g., alkali solutions) 15.1-60; ammonium carbonate 0.1-9.9. Composition of present invention afford the ability to limit the water and sand inflow, to increase strength and permeability of formed reservoir.

EFFECT: improved reservoir recovery, increased turnaround time, reduced underground equipment in well.

2 tbl, 4 ex, 2 cl

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