Method for development of non-uniform formations

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry. Method for development of non-uniform formations, which involves pumping displacement agents through injection wells and treatment of bottom-hole zones of wells by in-situ combustion, during development of non-uniform formations, represented by different-permeability formations (interlayers) separated by impermeable webs of unproductive rocks with thickness from 0.5 to 3 m, during treatment of bottom-hole zones of wells by in-situ combustion, temperature of combustion front is maintained at a level and during a time sufficient for creation of development zone permeability in impermeable webs of unproductive rocks and providing vertical filtration of fluids through created zone, wherein situ combustion is initiated in reservoir (interlayer) with minimum permeability.

EFFECT: improving coverage of displacement and oil recovery, lower costs of displacement agent on oil production due to more rational use of heat introduced into formation.

5 cl, 2 dwg, 2 ex

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method of oil field development by a horizontal and vertical well system using thermal impact involves horizontal and vertical well drilling and equipment, so that vertical well bottom is located below horizontal well bottom at a design vertical distance of 3 to 7 m, formation of heating area by injection of combustible oxidising mixture (COM) and combustion initiator (CI) to ignite and warm-up the inter-well zone up to 100-200C, depending on COM and CI type, and to establish hydrodynamic connection between wells; horizontal well is switched to liquid production by a pump, with continued supply of COM and CI to the vertical well to maintain burning and warming-up of the field to 250-350C which is the temperature of independent burning of COM; afterwards, CI supply is stopped, and COM injection continues to maintain and promote burning along the horizontal wellbore. During construction, horizontal well is equipped with a filter with several zones along the horizontal section length. Before pump landing in the horizontal well, a liner with thermocouples installed inside it for temperature monitoring inside the well opposite to filter zones, that allows for serial opening of only one zone during turning and for shutting filter zones from bottomhole to wellhead. Zone adjoining the bottomhole is opened initially. After combustion initiation, if temperature in this zone falls down from the maximum achievable by combustion in the field conditions to 85-95C, product pumping is stopped, the liner is turned from wellhead to a definite angle ensuring bottomhole zone shutoff and opening of the next zone used for further product extraction by pumping. After temperature in this zone changes from the maximum achievable by combustion in the field conditions to 85-95C, this zone is closed by a turn of the liner opening the next zone from the bottomhole, and similarly zones are opened and shut in sequence till the last filter zone from the bottomhole.

EFFECT: optimised operation of horizontal well, reduced power cost of its operation, expanded effective coverage of horizontal producer effect, reduced content of gas in the product extracted, enhanced depletion of oil field stock.

1 ex, 3 tbl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: method consists in separation of the developed ore field into blocks isolated from each other in pillars. In the central part of each block along the bottom of the deposit there arranged are two horizontal wells as mine chambers, in which there installed with provision of an air gap is an explosive charge of alternating non-sealed containers loaded with an explosive and hollow ones dividing the charge into separate parts, which are all fixed at the well head on a rope. Containers are provided throughout the length of the charging composition with main detonating cables connected to each other at the well head, and with electric detonators with closed conductors. The working end of the containers filled with explosives is provided with a charge hollow. The second end is plugged. In order to reduce seismic action of explosion, the above containers are provided with detonators of short-delay blasting, which are mounted in a section of the detonating cable located in the inner cavity of the container. With that, an offset of one of the above detonators is connected to the main line of the detonating cable. An offset of the second detonator is connected to a backup line. Vertical production wells are arranged along the circuit of module units and provided with Khobot-Tornado vortex pumps with flow-airlift pipes providing operation of the pump. Development of the deposit is performed as per a three-stage modular circuit by series transition into neighbouring blocks isolated with pillars. At the first stage, mine formation fracturing is performed with further extraction of gas and gas condensate by means of production wells. At the second stage, heat treatment of fractured formations is performed by supplying under pressure of at least 2.0 MPa of high-temperature combustion products through vertical parts of horizontal wells into the bottom part of the formation with further removal of molten solid and viscous organic component parts. At the third stage, through vertical part of the horizontal wells there pumped to the cavity of the formation is an alkali solution to leach ash shale formations for extraction of rare-earth component parts.

EFFECT: improving development efficiency of shale deposits in areas with developed infrastructure of metropolitan cities due to improvement of environmental safety and economical effectiveness.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to production of viscous hydrocarbons from the underground collector. The in-situ combustion method intended for reduction of oil viscosity includes the following operations: usage of at least one producer having in essence a vertical section descending to the above reservoir and having a section of horizontal branch coupled by fluid to the above vertical section and passing outside horizontally from it, at that the above section of the horizontal branch is completed relatively low in the reservoir; usage of at least one injector in the area between the opposite ends of the above horizontal branch with offsetting from the above horizontal branch placed in essence directly over the above section of the horizontal section and in vertical adjustment with it for the purpose of oxidizing gas injection to the above reservoir over the above section of the horizontal branch and to the are between the opposed ends of the above section of the horizontal branch; injection of oxidizing gas through the above at least one injector and initiation of hydrocarbon combustion in the above reservoir close to the above injector with creation of at least one or several combustion fronts over the above section of the horizontal branch, at that one or several combustion fronts lead to reduced viscosity of oil in the above reservoir and to oil flowing down to the above section of the horizontal branch; arrangement of conditions for accumulation of high-temperature gaseous combustion products with the above low-viscous oil in the above section of the horizontal branch; lifting of the above high-temperature gases and oil to the surface; separation of oil and high-temperature gaseous combustion products near the horizontal well bottom or at the surface.

EFFECT: increased oil recovery standard rate, improved oil quality, potential operation of reservoirs inaccessible directly from the surface at moderate costs of the development method.

21 cl, 5 dwg, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the oil industry, in particular, to development methods of oil pools with reservoirs difficult to recover using thermal oil recovery methods. In the development method of an oil pool with reservoirs difficult to recover, which is implemented by the injection of an oxidiser and water fringes to injectors and by oil extraction from producers, before the oxidiser injection to the formation an aqueous solution of carbonic acid normal salt with a water-soluble acrylic polymer and an acid bath are injected to the formation. Besides, the injection of the aqueous solution of carbonic acid normal salt with the water-soluble acrylic polymer and the acid bath to the formation is made by turns, in cycles, in order to obtain the required volume of the fringe. When gas is broken to the producers, the highly permeable intervals of the formation are isolated.

EFFECT: improved efficiency of the method at the development of oil pools with normal and high viscosity due to the generation of the area with the required oil saturation, reduced fuel consumption for maintenance of the combustion process, more complete usage of the oxidiser and safer development of the pool with inhomogeneous and fractured reservoirs, increased coverage of the formation area with the combustion and displacement process.

3 cl

FIELD: oil and gas industry.

SUBSTANCE: in development method of a high-viscosity oil deposit using in-situ combustion, involving construction of horizontal and vertical wells, pumping of an oxidiser through vertical well and extraction of product from horizontal well, working face of vertical well is located at the distance of 28-32 m above horizontal well and at the distance of 10-15, from its working face towards the head. Prior to pumping of the oxidiser, in horizontal and vertical wells there installed are electric heaters with power sufficient for warm-up of borehole environment to the temperature of 100-200C. After that, pumping of the oxidiser is started to both wells for initiation of in-situ combustion in the deposit in the bottom-hole area of location both wells. Then, when formation pressure near horizontal well exceeds the value of level of initial formation pressure more than by 1.5 times, the electric heater is removed from horizontal well and pump equipment is lowered to it, by means of which pumping-out of the deposit product is performed. When liquid level in the well decreases to 100% to 90% of the level of initial formation pressure, the product extraction is stopped, pump equipment is removed, electric heater is lowered, and the oxidiser pumping is performed to initiate in-situ combustion. Cycle of product extraction and initiation of in-situ combustion is repeated and stopped at establishment of hydrodynamic communication between horizontal and vertical wells. Then, horizontal well is operated in a product extraction mode. Electric heater installed in the vertical well is disconnected and removed from that well after the mode of stable high-temperature combustion is set; after that, oxidiser pumping is continued.

EFFECT: providing quicker growth of average temperature in the deposit, higher oil extraction values already at initial stage of the deposit development with simultaneous reduction of material costs and increase in safety of work on wells.

1 tbl, 1 ex, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: heat is supplied to the first part of subsurface formation, at that at least two heaters are located in heating wells in the above first part; fluids are extracted from one or more production wells in the second part of the formation, at that this part adjoins at least partially the above first part; heat supply is reduced or stopped to the first part when the preset time is over; then oxidising fluid is fed through one or more heating wells in the first part; heat is supplied to the first and second parts in result of oxidisation of at least some amount of hydrocarbons in the first part and movement of fluids heated in result of such oxidisation from the first part to the second one; fluids are withdrawn from at least one production well in the second part, at that produced fluids contain at least some quantity of oxidised hydrocarbons formed in the first part meanwhile high pressure is maintained in the heated part of the formation: at which the added formation fluid has minimum number of compounds with carbon number value more than 8 to provide conditions of pyrolysis of polynuclear hydrocarbon compounds and their quality control as well as prevention of formation falling in the course of its thermal treatment.

EFFECT: increasing efficiency of hydrocarbon production from subsurface formations.

41 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves initiation of in-situ combustion at least in one injection well, pumping and measurement of air flow rate and advancing of combustion front from the well inside the formation under action of pumped air; arrangement of a number of sensors on the surface or at small depth under the ground around injection well; recording of sensors readings. In order to study the spatial position of combustion front, field temperature surveys are performed by means of temperature sensors, and geochemical surveys are performed by means of sorbent sensors and by extracting the soil samples. Location grid of sorbent sensors and soil sampling points coincides with location grid of temperature sensors. Arrangement of sorbent sensors and extraction of soil samples is performed to determine concentrations of hydrocarbon (C1-C6) and non-hydrocarbon (H2, N2, CO, CO2, O2) gases. As per the results of field surveys there built are maps of distribution of temperatures and distribution of concentrations of hydrocarbon and non-hydrocarbon gases; they are interpreted and spatial position of combustion front is determined as per the received materials.

EFFECT: improving accuracy and reducing the time spent on determination of location of in-situ combustion front in oil deposits.

5 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: extraction method of liquefied or gassed hydrocarbon from underground hydrocarbon header involves the following: provision at least of one production well mainly having horizontal shaft located relatively low in the header, and provided with near-wellbore part on one end and bottomhole part on the opposite end; at that, horizontal shaft provides liquefied hydrocarbon supply to inner volume of horizontal shaft. Production well mainly has vertical section connected to horizontal shaft near its near-wellbore part; provision of tubing string inside production well located within the limits of vertical section and within the limits at least of some part of horizontal shaft for collection of hydrocarbon that flows to horizontal shaft; pumping of the medium that is chosen from the group of media including, either separately or in a combination, non-oxidising gas, steam, water or carbon dioxide to production well; oxidising gas supply to underground header, at least first in the location of vertical section of production well or near vertical section of production well; lighting-up of hydrocarbon in hydrocarbon header near vertical section of production well in order to initiate the firing of some part of hydrocarbon in hydrocarbon header near vertical section and creation of burning front that spreads from injection well at least in the direction along horizontal shaft to its bottomhole part; provision of run-off of heated liquefied hydrocarbon from upper zones of the header and collection in horizontal shaft; removal of hydrocarbon that has run off to horizontal shaft from production well via tubing string. Inventions have been developed in dependent claims.

EFFECT: avoiding the need for a separate platform for pumping of oxidising gas, due to which costs are reduced and environmental hazard is decreased; avoiding the possibility of displacement of oxidising gas to horizontal shaft of production well.

17 cl, 8 dwg

FIELD: oil-and-gas production.

SUBSTANCE: proposed method comprises injecting oxidiser via injection wells, producing fire flooding and oil production in production wells with horizontal shaft in reservoir bottom. Injection well bottom is located some 3-5 m above horizontal shaft. Note here that injection well opening zone is located at lower half of productive accumulation. Two opposite-direction horizontal sections are drilled from injection well into bed top section in parallel with horizontal shaft of production well. Injection well is additionally equipped with casing with parker to isolate tubular annulus above opening zone. Note also injection well casing is used to inject heat carrier while oxidiser is injected via tubular annulus, alternating with water, in amount sufficient for fire flooding. If temperature of oil from production well exceeds preset tolerance, cold incombustible gas is injected therein to reduce temperature.

EFFECT: higher yield due to higher efficiency of high-viscosity oil displacement.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: in processing method of bottom-hole formation zone, which involves pumping to the formation of magnesium granules with further pumping of acid compound, first, hydraulic fracturing of the formation is performed with further pumping of mixture of magnesium granules and propane with fluids on hydrocarbon or water basis. Then, to the processed zone of the formation there pumped is combustible oxidation composition (COC) which contains oxidiser, catalyst decreasing the value of the temperature required for the beginning of oxidation reaction, surface-active substance required for removal of hydrocarbon film from magnesium, and water. After oxidation reaction is completed and additional cracks are formed, acid compound increasing the size of the formed cracks is pumped.

EFFECT: increasing processing efficiency of the bottom-hole formation zone at increasing safety of the work execution process.

2 ex

FIELD: oil production, particularly with the use of heat.

SUBSTANCE: method involves drilling vertical wells in oil-bearing reservoir; injecting water; producing oil; igniting oil-bearing reservoir; producing residual oil. Before formation ignition mixture containing 55% nitric acid and diesel fuel is supplied in oil-bearing reservoir via injection wells. The mixture contains 83.1-95% by weight of 55% nitric acid and 5-16.9% by weight of diesel fuel. After reservoir ignition residual oil is displaced from reservoir with water.

EFFECT: increased efficiency due to elimination the need of continuous oxidizing agent injection in reservoir for combustion sustaining.

1 cl, 1 tbl

FIELD: hydrocarbon, hydrogen and/or other product extraction methods and systems, particularly enhanced recovery methods thereof with the use of heat, namely in-situ hydrocarbon conversion.

SUBSTANCE: method for in-situ hydrocarbon reservoir treatment involves supplying heat from one or several sources to at least one reservoir section, wherein heat sources may include natural distributed combustion chamber. Natural distribution combustion chamber comprises oxidizing fluid source to supply oxidizing fluids to reaction reservoir zone for heat generation in reaction zone. Heat is transferred from reaction zone to selected transversal reservoir section so that heat from one or several heat sources provide pyrolysis of at least one part of hydrocarbons in selected zone. Hydrocarbons are produced from said reservoir.

EFFECT: increased method efficiency and production system reliability.

31 cl, 10 dwg

FIELD: mining.

SUBSTANCE: according to one version procedure consists in assembly of at least one pressure well for pumping gas-oxidant into underground reservoir, in assembly of at least one producing well with mainly one horizontal section and mainly one vertical well connected with it, also mainly horizontal section passes in direction to pressure well and has wellhead in direct vicinity from connection of horizontal section with vertical producing well and bottomhole at another end, which is located closer to pressure well, than to wellhead; in pressurisation of gas-oxidant through pressure well for initiating in-situ combustion, at which gaseous combustion products are generated so, that there is facilitated their advance in form of front mainly perpendicular to horizontal section; also fluids flow into horizontal section; further procedure consists in arrangement of pressurisation pipe in vertical part and in at least part of horizontal section of producing well; this pipe pressurises steam, water or non-oxidising gas into horizontal section of producing well near firing front formed at certain distance along horizontal section of producing well; procedure consists in pressurisation of medium chosen from group containing steam, water and or non-oxidising gas via pipe to bottomhole of horizontal section of producing well, in changing zone of pressurisation of steam, water or non-oxidising gas due to pipe displacement relative to horizontal section; and in extraction of hydrocarbon products via horizontal section of producing well. Other versions of the procedure correspond to variations of the above said version.

EFFECT: increased efficiency of procedure due to increased consumption of oxidising gas into pressure well and eliminating its outbreak into producing well.

17 cl, 6 ex, 6 tbl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: invention elates to oil-producing industry, particularly to heating-physico-chemical treatment of bottomhole zone of stratum. Device includes: two pipes for separate pumping of initial components, mixer, solid-fueled heater, consisting fuel coffin with lattice bottom, allowing openings for withdrawal of combustion materials, casing of fuse mechanism, implemented in the form of sleeve, in bottom of which it is opening for air flow for keeping of burning, in which it is valvatecouple and back pressure valve, connected to fuel coffin by means of coupling, container, filled by flammable liquid, which is implemented with ability of actuation under action of cargo dumped from above, and is place inside the casing of fuse mechanism. In casing of fuse mechanism there are openings for passing through it two pipes for separate pumping of initial component, implemented with ability of passage through the fuel coffin and entry through aiming back pressure valve tangential into mixing reactor from above. Mixing reactor corresponds drum, in bottom of which is tray downspout for withdrawal of a product. At the end of it is adjusted valve, connected to fuel coffin by means of coupling.

EFFECT: creation of device, providing implementation of simultaneously-separate pumping of light hydrocarbon and air, with high withdrawal of a reaction product and implementation of mixing on well bottom at arrival into stratum.

3 dwg

FIELD: oil-and-gas production.

SUBSTANCE: method includes pumping of oxidising agent through injection wells, arrangement of in-situ combustion and withdrawal of products through producing wells. Into injection wells there is additionally injected in parallel to oxidising agent fuel. In the capacity of producing there are used wells with horizontal bore in suspended part of stratum, and in the capacity of injection wells - vertical, which are located at specific distance from end part of horizontal bore and from each other, excluding cracking of fuel or oxidising agents into other wells in the direction of continuation of horizontal bore. Fuel is pumped through vertical wells, close to horizontal bore, and oxidising agent-through remote. Bottom-hole pressure of fuel is implemented at pressure higher than pressure of opening of vertical cracks, and oxidising agent - higher than pressure of pumping fuel.

EFFECT: effectiveness increase of process displacement of high-viscosity oil by means of increasing of reservoir coverage of impact ensured sequential treatment of all stratum with holding of high permeability.

2 cl, 1 ex, 2 dwg, 1 tbl

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises injecting oxidiser via injection wells, carrying out fire flooding and extracting oil through output wells. Additionally, fuel mixed with water is injected into injection wells parallel to oxidiser. Output wells represent horizontal holes in the bed bottom part, while injection holes are vertical wells arranged at a certain distance from horizontal hole end and from each other to rule out outburst of fuel or oxidiser into other wells in direction along horizontal well continuation. Fuel is forced parallel with water on mixing it directly prior to injection into bed through vertical wells nearest to horizontal well while oxidiser is injected through remote wells. Fuel injection bottom hole pressure exceeds that of vertical fracture opening and oxidiser injection pressure exceeds that of fuel injection. Note here that amount of water in fuel is increased when temperature of extracted product exceeds preset value and decreased when the former decreases below preset temperature.

EFFECT: higher efficiency of fire flooding thanks to adjustment of fire temperature and creation of steam chamber inside bed, expended performances of low-permeability beds.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: hydraulic jet perforation is performed in production well, disengaging gear - packer and check valves are installed, oxidiser is pumped and heat treatment of bottomhole zone of the formation in which the formation fluid is extracted prior to the work beginning is performed. There determined is temperature of the beginning of liquid-phase oxidation and temperature of coke formation, there opened is productive formation and installed is hydrodynamic connection to the formation by means of hydraulic jet perforation in two intervals of productive formation - lower and upper one. Disengaging gear is installed between holes of lower and upper intervals of hydraulic jet perforation. Lower check valve opening to the outside is arranged in flow column below the disengaging gear, and upper check valve opening to the inside of cavity of tubing - above disengaging gear. After that lower part of bottomhole formation zone is heated up to temperature of the beginning of liquid-phase oxidation of hydrocarbons of formation fluid and together with it and/or after it there supplied is oxidiser to lower part of bottomhole formation zone along flow column through lower check valve and lower holes of hydraulic jet perforation. Hydrocarbons of formation fluid are heated up to temperature of coke formation, and development of the well and extraction of products from it after oxidation reactions are completed in the formation is performed through upper holes of hydraulic jet perforation, upper check valve and cavity of flow column.

EFFECT: increasing the efficiency of the extraction process of hydrocarbons from the well.

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling and arrangement of vertical and horizontal wells so that bottomhole of vertical well is located above bottomhole of horizontal well at design distance along vertical of 3 to 7 m. Warming-up area is created and its movement along the formation is provided parallel to the bore of horizontal well owing to pumping of displacement agent to vertical well. Liquid extraction is arranged by means of horizontal well. According to invention, as agent there used is combustible-oxidation mixture - COM, for example mixture of carbamide, nitric acid, acetic acid, water and ammonium nitrate, which burns under influence of temperature or initiating agent of burning - IAB, for example the compound containing aluminium and chrome oxide; at that, prior to production there supplied is COM and IAB by mixing prior to their being pumped to formation via vertical and horizontal wells in order to ignite and warm-up the inter-well zone of up to 100-200C, depending on COM and IAB type, and establishment of hydrodynamic connection between wells; after that horizontal well is involved in liquid production, and COM and IAB is continued to be supplied to vertical well in order to maintain burning and warming-up of deposit to temperature of independent burning of COM - to 250-350C; after that IAB supply is stopped and COM pumping is continued to maintain and move the burning process parallel to the bore of horizontal well.

EFFECT: increasing development efficiency of oil or bitumen deposit owing to using thermal action on oil bed, and increasing oil extraction coefficient owing to using environmentally safe development procedure.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves oil withdrawal through production wells, ignition of oil formation and pumping of air and working agent to pressure wells. According to invention, after 45-50% of removable stocks to pressure wells as working medium is removed, hot water with temperature of not less than 60C, density of 1.000-1.005 g/cm3 and viscosity exceeding the viscosity of pumped air is pumped. At that, hot water is pumped through pressure well with small formation pressure in the centre of the chosen section of developed deposit, production wells with water content of 99% close and provide heat transfer from zone of high temperatures of deposit to zones of its low temperatures by covering the areas exceeding the sizes of the chosen section.

EFFECT: increasing oil recovery efficiency of deposit owing to involvement in development of zones of formation layer with non-used stocks.

2 cl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves fuel pumping through vertical injection wells, air pumping - through the other injection well, arrangement of in-situ combustion and product selection through production well with horizontal shaft in bottom part of formation. Production well is equipped with temperature sensors throughout the length of horizontal section through which product is extracted. Injection well with horizontal section located above horizontal section of production well by the value exceeding the air burst value is used as injection well for air supply. As injection air supply wells there used is a number of wells the bottomholes of which are located above horizontal section of injection air supply well by the value exceeding air and fuel burst value. Fuel supply through vertical wells is controlled so that almost equal temperature of products can be maintained throughout the length of horizontal section of production well.

EFFECT: increasing efficiency at using formation combustion owing to controlling the temperature of extracted product throughout the length of horizontal section of production well, and enlarging the coverage of formation with steam chamber.

1 dwg

Up!