WO2024054129A1 - Method for recovering oil - Google Patents
Method for recovering oil Download PDFInfo
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- WO2024054129A1 WO2024054129A1 PCT/RU2023/000257 RU2023000257W WO2024054129A1 WO 2024054129 A1 WO2024054129 A1 WO 2024054129A1 RU 2023000257 W RU2023000257 W RU 2023000257W WO 2024054129 A1 WO2024054129 A1 WO 2024054129A1
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- Prior art keywords
- oil
- solvent
- viscosity
- formation
- production
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002904 solvent Substances 0.000 claims abstract description 44
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 34
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 33
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000009835 boiling Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000010426 asphalt Substances 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 239000000839 emulsion Substances 0.000 abstract description 6
- 231100000331 toxic Toxicity 0.000 abstract description 6
- 230000002588 toxic effect Effects 0.000 abstract description 6
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 30
- 238000004227 thermal cracking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000012261 resinous substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Definitions
- the invention relates to methods for oil production by thermal methods and can be used for the production of high-viscosity oils, in which the viscosity of the oil is reduced.
- the “gravitational steam-power method of oil production” is known using a pressure and intake pipeline, in which a low-boiling liquid under pressure is introduced into the oil-bearing layer through a pressure pipeline, which evaporates in the oil-bearing layer, and its mixture with oil is removed to the surface through the intake pipeline. The mixture is separated, the oil is collected, and the vapor of the low-boiling liquid is condensed for reuse in the well (RF patent No. 2245999, 1998).
- the most common way to intensify the production of high-viscosity oils and natural bitumens are thermal extraction methods, for example, thermal steam (patent RU No. 2098613, IPC E21B 43/24, 1997).
- the method includes drilling and preparing a deposit for production with at least two pairs of wells having horizontal sections, where each pair includes an injection well ending in the deposit, and a production well ending in the deposit below the level of the injection well, and the horizontal sections of the production and injection well as within the pair, and separately for each pair, are parallel to each other.
- a permeable zone is created between the injection well and the production well of each pair of wells, water steam is injected through the injection wells, and hydrocarbons are simultaneously extracted through the production wells.
- the disadvantage of this method is that the injection of steam and hydrocarbon solvent into the formation is carried out without taking into account their effect on the change in the viscosity of the product in layer As a result, there is an irrational consumption of steam and expensive hydrocarbon solvent, with the formation of water-saturated toxic emulsions.
- a thermal method of oil production is known, using low-viscosity oil as a solvent (US Pat. 4461350, class E 21 B 43/24, 166/272).
- the essence of the method is that hot oil of reduced viscosity is fed into the formation through injection wells, where it dissolves viscous formation oil, heats the formation, which leads to a decrease in the viscosity of the formation oil.
- the closest in technical essence and achieved result is the method of producing high-viscosity oil (RF Patent 1487555, 1987) by pumping into the formation a coolant-solvent with a viscosity lower than the viscosity of reservoir oil, characterized in that, in order to prevent the precipitation of asphalt-resinous substances in reservoir, losses of associated oil metals and increased oil production, oil fractions with a boiling point greater than 210°C are injected into the reservoir as a coolant-solvent at an injection temperature of 150 - 300°C.
- a hot coolant-solvent injected into the formation causes heating of the oil formation, which leads to a decrease in the viscosity of the oil.
- the molecular weight and the boiling point of oil fractions there is a certain relationship between the molecular weight and the boiling point of oil fractions; the larger the molecular weight of the oil fraction, the higher its boiling point.
- the used coolant-solvent with a boiling point greater than 210°C contains molecules with a high molecular weight that reduce the diffusion of the solvent into the oil.
- the objective of the proposed invention is to increase the diffusion of the solvent into oil, while simultaneously eliminating the costs of water treatment and injection of water vapor, which forms water-saturated toxic emulsions.
- the problem is solved due to the fact that the proposed method of oil production makes it possible to avoid the injection of water vapor into the oil product formation, thereby eliminating the formation of watered toxic emulsions, since heated hydrocarbon fractions with a boiling point of less than 210°C are pumped into the oil product formation as a solvent, under pressure in the form of a gas-liquid mixture with temperatures up to 410°C.
- the proposed method of oil production includes the construction of an upper injection well and a lower production well with horizontal sections located one above the other, injection of a solvent consisting of heated hydrocarbon fractions into the oil product formation through a horizontal injection well with heating of the formation, creating a zone of influence of the heated hydrocarbon solvent and selection of products through a horizontal production well.
- heated hydrocarbon fractions with a boiling point of less than 210°C are pumped in as a solvent, under pressure in the form of a gas-liquid mixture with a temperature of up to 410°C.
- a solvent consisting of heated hydrocarbon fractions reduces the viscosity of oil, in addition, due to diffusion into oil, it contributes to its dilution to an even greater extent. degrees, forming oil with reduced viscosity. Due to gravity drainage, once the viscosity of the mixture of hydrocarbon solvent and reduced viscosity oil is low enough to flow through the formation to the production well, oil extraction from the formation begins.
- Figure 1 shows a diagram of the proposed method for developing a deposit of high-viscosity oil or bitumen containing an injection well 1, a thermal cracking unit 2, a production well 3, a seal formation 4, an oil product formation 5, a clay formation 6 and a zone of influence of a heated hydrocarbon solvent 7.
- V is the flow of hydrocarbon solvent for injection into the reservoir
- FIG. 1 An example of the implementation of the proposed method of oil production is presented in a diagram with the selection of a heated hydrocarbon solvent in an in-field thermal cracking unit (Fig. 1) and includes the following.
- a heated hydrocarbon solvent with a boiling point below 210°C in the form of a gas-liquid mixture with a temperature of up to 410°C is carried out through a horizontal injection well 1, the oil product formation is heated to create a zone 7 of thermal influence and diffusion of the hydrocarbon solvent into oil.
- the heated hydrocarbon solvent reduces the viscosity of oil, and, due to diffusion into the oil, contributes to its dilution to an even greater extent. Due to gravity drainage, after the viscosity of the mixture of hydrocarbon solvent and reduced-viscosity oil becomes low enough to allow it to flow through the formation to the production well 3, the extraction of stream II of the mixture of hydrocarbon solvent and reduced-viscosity oil from the formation begins.
- Stream II a mixture of hydrocarbon solvent and oil with reduced viscosity, is supplied to the field thermal cracking unit 2, from which stream III of upgraded oil comes out and stream IV of the hydrocarbon solvent is taken.
- Stream IV of hydrocarbon solvent is divided into output stream VI of excess hydrocarbon solvent and withdrawn stream V of hydrocarbon solvent for injection into the formation heated in the field thermal cracking unit 2.
- the proposed method of oil production allows increasing the diffusion of the solvent into the oil, while simultaneously eliminating the costs of water treatment and injection of water vapor, which forms water-saturated toxic emulsions.
Abstract
The invention relates to thermal oil recovery methods and can be used for recovering high-viscosity oils while at the same time reducing oil viscosity. Proposed is a method for developing a deposit of highly viscous oil or bitumen which includes forming two horizontal wells arranged one above the other, and injecting a solvent into the injection well and withdrawing product from the production well, the method being characterized in that the role of solvent is played by heated hydrocarbon fractions having a boiling point below 210°С, which are injected under pressure in the form of a liquid-gas mixture with a temperature of up to 410°С. The technical result is a method that makes it possible to increase diffusion of the solvent into oil, while at the same time eliminating the cost of preparing water and injecting steam which forms water-saturated toxic emulsions.
Description
ОПИСАНИЕ ИЗОБРЕТЕНИЯ: DESCRIPTION OF THE INVENTION:
Название изобретения Name of invention
СПОСОБ ДОБЫЧИ НЕФТИ METHOD OF OIL PRODUCTION
Изобретение относится к способам добычи нефти тепловыми методами и может использоваться для добычи высоковязких нефтей, при котором вязкость нефти снижается. The invention relates to methods for oil production by thermal methods and can be used for the production of high-viscosity oils, in which the viscosity of the oil is reduced.
Известен "Гравитационный паросиловой способ добычи нефти" с использованием напорного и заборного трубопровода, при котором по напорному трубопроводу в нефтеносный слой вводят легкокипящую жидкость под давлением, которая испаряется в нефтеносном слое, и её смесь с нефтью через заборный трубопровод извлекают на поверхность. Смесь сепарируют, собирают нефть, а пар легкокипящей жидкости конденсируют для повторного использования в скважине, (патент РФ №2245999, 1998 г.). The “gravitational steam-power method of oil production” is known using a pressure and intake pipeline, in which a low-boiling liquid under pressure is introduced into the oil-bearing layer through a pressure pipeline, which evaporates in the oil-bearing layer, and its mixture with oil is removed to the surface through the intake pipeline. The mixture is separated, the oil is collected, and the vapor of the low-boiling liquid is condensed for reuse in the well (RF patent No. 2245999, 1998).
Недостатком способа является то, что для конденсации паров легкокипящей жидкости, при данном способе добычи нефти необходимо использовать целый набор достаточно сложных технических средств (в том числе холодильный агрегат, компрессор, сепаратор). The disadvantage of this method is that in order to condense the vapors of a low-boiling liquid, with this method of oil production it is necessary to use a whole set of rather complex technical means (including a refrigeration unit, compressor, separator).
Наиболее распространенными способом интенсификации добычи высоковязких нефтей и природных битумов являются термические методы добычи, например, паротепловое воздействие (патент RU №2098613, МПК Е21В 43/24, 1997 г.). Способ включает бурение и подготовку залежи к эксплуатации по меньшей мере двумя парами скважин, имеющих горизонтальные участки, где каждая пара включает нагнетательную скважину, заканчивающуюся в залежи, и добывающую скважину, заканчивающуюся в залежи ниже уровня нагнетательной скважины, причем горизонтальные участки добывающей и нагнетательной скважины как внутри пары, так и отдельно каждой пары параллельны между собой. При реализации способа создают проницаемую зону между нагнетательной скважиной и добывающей скважиной каждой пары скважин, нагнетание водяного пара осуществляют по нагнетательным скважинам, одновременное извлечение углеводородов осуществляют по добывающим скважинам. The most common way to intensify the production of high-viscosity oils and natural bitumens are thermal extraction methods, for example, thermal steam (patent RU No. 2098613, IPC E21B 43/24, 1997). The method includes drilling and preparing a deposit for production with at least two pairs of wells having horizontal sections, where each pair includes an injection well ending in the deposit, and a production well ending in the deposit below the level of the injection well, and the horizontal sections of the production and injection well as within the pair, and separately for each pair, are parallel to each other. When implementing the method, a permeable zone is created between the injection well and the production well of each pair of wells, water steam is injected through the injection wells, and hydrocarbons are simultaneously extracted through the production wells.
Недостатком является то, что известные методы паротеплового воздействия являются достаточно энергозатратны и неэффективны - поскольку необходимы затраты на водоподготовку и парообразование. Кроме того, возникают очень большие количества воды, которые вместе с нефтью образуют нефтеводогазовые эмульсии, которые транспортируются на земную поверхность, осложняя промысловую подготовку нефти, так как токсичные продукты трудно утилизируются. The disadvantage is that the known methods of steam-thermal exposure are quite energy-consuming and ineffective - since costs are required for water treatment and steam generation. In addition, very large amounts of water appear, which, together with oil, form oil-water-gas emulsions, which are transported to the earth's surface, complicating oil field preparation, since toxic products are difficult to dispose of.
Известен способ разработки залежи высоковязкой нефти (патент RU №2387818, МПК Е21В 43/24, 2010 г.), согласно которому производят закачку пара в пласт, прогрев пласта с созданием паровой камеры, совместную закачку пара и углеводородного растворителя и отбор продукции. Совместную закачку пара и углеводородного растворителя осуществляют после достижения температуры в паровой камере не менее температуры фазового перехода смеси пара и углеводородного растворителя с поддержанием температуры в паровой камере не ниже температуры фазового перехода смеси пар - углеводородный растворитель. There is a known method for developing high-viscosity oil deposits (patent RU No. 2387818, MPK E21B 43/24, 2010), according to which steam is injected into the formation, the formation is heated to create a steam chamber, steam and hydrocarbon solvent are simultaneously injected, and products are withdrawn. The joint injection of steam and hydrocarbon solvent is carried out after the temperature in the steam chamber has reached not less than the phase transition temperature of the mixture of steam and hydrocarbon solvent with maintaining the temperature in the steam chamber not lower than the phase transition temperature of the mixture of steam - hydrocarbon solvent.
Недостатком способа является то, что закачки пара и углеводородного растворителя в пласт проводятся без учета их влияния на изменение вязкости продукции в
пласте. В результате происходит нерациональный расход пара и дорогостоящего углеводородного растворителя, с образованием обводненных токсичных эмульсий. The disadvantage of this method is that the injection of steam and hydrocarbon solvent into the formation is carried out without taking into account their effect on the change in the viscosity of the product in layer As a result, there is an irrational consumption of steam and expensive hydrocarbon solvent, with the formation of water-saturated toxic emulsions.
Известен термический способ добычи нефти, использующий в качестве растворителя нефть пониженной вязкости (Пат. 4461350 США, кл. Е 21 В 43/24, 166/272). Суть способа заключается в том, что горячая нефть, пониженной вязкости, через нагнетательные скважины подается в пласт, где она растворяет вязкую пластовую нефть, нагревает пласт, что приводит к уменьшению вязкости пластовой нефти. A thermal method of oil production is known, using low-viscosity oil as a solvent (US Pat. 4461350, class E 21 B 43/24, 166/272). The essence of the method is that hot oil of reduced viscosity is fed into the formation through injection wells, where it dissolves viscous formation oil, heats the formation, which leads to a decrease in the viscosity of the formation oil.
Недостатком способа является то, что тем добыча нефти сопряжена добычей нефти пониженной вязкости, которую к тому же нужно транспортировать к месту добычи высоковязкой нефти. The disadvantage of this method is that oil production involves the production of low-viscosity oil, which also needs to be transported to the place of high-viscosity oil production.
Наиболее близким по технической сущности и достигаемому результату является способ добычи высоковязкой нефти (Патент РФ 1487555, 1987г.) путем закачки в пласт теплоносителя-растворителя с вязкостью, меньшей вязкости пластовой нефти, отличающийся тем, что, с целью предотвращения выпадения асфальтово-смолистых веществ в пласте, потерь попутных металлов нефти и увеличения добычи нефти, в пласт в качестве теплоносителя-растворителя закачивают фракции нефти с температурой кипения больше 210°С при температуре закачки 150 - 300°С. The closest in technical essence and achieved result is the method of producing high-viscosity oil (RF Patent 1487555, 1987) by pumping into the formation a coolant-solvent with a viscosity lower than the viscosity of reservoir oil, characterized in that, in order to prevent the precipitation of asphalt-resinous substances in reservoir, losses of associated oil metals and increased oil production, oil fractions with a boiling point greater than 210°C are injected into the reservoir as a coolant-solvent at an injection temperature of 150 - 300°C.
Нагнетаемый в пласт горячий теплоноситель-растворитель, вызывает нагрев нефтяного пласта, что приводит к понижению вязкости нефти. Однако между молекулярной массой и температурой кипения нефтяных фракций существует определенная зависимость, чем больше молекулярная масса нефтяной фракции, тем выше ее температура кипения. Учитывая эту зависимость, применяемый теплоноситель- растворитель с температурой кипения больше 210°С содержит молекулы с большой молекулярной массой, понижающих диффузию растворителя в нефть. A hot coolant-solvent injected into the formation causes heating of the oil formation, which leads to a decrease in the viscosity of the oil. However, there is a certain relationship between the molecular weight and the boiling point of oil fractions; the larger the molecular weight of the oil fraction, the higher its boiling point. Taking into account this dependence, the used coolant-solvent with a boiling point greater than 210°C contains molecules with a high molecular weight that reduce the diffusion of the solvent into the oil.
Задачей предлагаемого изобретения является повышение диффузии растворителя в нефть, с одновременным исключением затрат на водоподготовку и закачку водяного пара, образующего обводненные токсичные эмульсии. The objective of the proposed invention is to increase the diffusion of the solvent into oil, while simultaneously eliminating the costs of water treatment and injection of water vapor, which forms water-saturated toxic emulsions.
Поставленная задача решается благодаря тому, что предлагаемый способ добычи нефти позволяет отказаться от закачки водяного пара в нефтяной продуктовый пласт, тем самым исключить образование обводненных токсичных эмульсий, поскольку в нефтяной продуктовый пласт в качестве растворителя закачивают нагретые углеводородные фракции с температурой кипения менее 210°С, под давлением в виде газожидкостной смеси с температурой до 410°С. The problem is solved due to the fact that the proposed method of oil production makes it possible to avoid the injection of water vapor into the oil product formation, thereby eliminating the formation of watered toxic emulsions, since heated hydrocarbon fractions with a boiling point of less than 210°C are pumped into the oil product formation as a solvent, under pressure in the form of a gas-liquid mixture with temperatures up to 410°C.
Предлагаемый способ добычи нефти включает строительство верхней нагнетательной скважины и нижней добывающей скважины с горизонтальными участками, расположенными друг над другом, закачку в нефтяной продуктовый пласт растворителя, состоящего из нагретых углеводородных фракций, производят через горизонтальную нагнетательную скважину с прогревом пласта, созданием зоны воздействия нагретого углеводородного растворителя и отбором продукции через горизонтальную добывающую скважину. The proposed method of oil production includes the construction of an upper injection well and a lower production well with horizontal sections located one above the other, injection of a solvent consisting of heated hydrocarbon fractions into the oil product formation through a horizontal injection well with heating of the formation, creating a zone of influence of the heated hydrocarbon solvent and selection of products through a horizontal production well.
Новым является то, что в качестве растворителя закачивают нагретые углеводородные фракции с температурой кипения менее 210°С, под давлением в виде газожидкостной смеси с температурой до 410°С. Растворитель, состоящий из нагретый углеводородный фракций, в результате теплового воздействия снижает вязкость нефти, кроме того благодаря диффузии в нефть способствует ее разжижению в еще большей
степени, образуя нефть с пониженной вязкостью. В силу гравитационного дренажа после того, как вязкость смеси углеводородного растворителя и нефти с пониженной вязкостью станет достаточно низкой, позволяющей ей протекать через пласт к добывающей скважине, начинают извлечение нефти из пласта. What is new is that heated hydrocarbon fractions with a boiling point of less than 210°C are pumped in as a solvent, under pressure in the form of a gas-liquid mixture with a temperature of up to 410°C. A solvent consisting of heated hydrocarbon fractions, as a result of thermal effects, reduces the viscosity of oil, in addition, due to diffusion into oil, it contributes to its dilution to an even greater extent. degrees, forming oil with reduced viscosity. Due to gravity drainage, once the viscosity of the mixture of hydrocarbon solvent and reduced viscosity oil is low enough to flow through the formation to the production well, oil extraction from the formation begins.
Предлагаемый способ добычи нефти в конструктивном варианте со строительством, непосредственно на промысле, облагораживающих нефть установок термического крекинга, в коих допустимо отбирать нагретые углеводородные фракции с температурой кипения ниже 210°С, которые приемлемы как растворитель. The proposed method of oil production in a constructive version with the construction, directly at the field, of thermal cracking units that refine oil, in which it is permissible to select heated hydrocarbon fractions with a boiling point below 210 ° C, which are acceptable as a solvent.
Кроме того, предлагаемый способ добычи нефти в конструктивном варианте с строительством, непосредственно на промысле, облагораживающих нефть установок термического окислительного крекинга, в коих допустимо отбирать фракции с температурой кипения ниже 210°С, которые приемлемы как растворитель, а й в силу окислительного нагрева без сжигания топлива, исключат парниковые выбросы. In addition, the proposed method of oil production in a constructive version with the construction, directly at the field, of thermal oxidative cracking units that refine oil, in which it is permissible to select fractions with a boiling point below 210 ° C, which are acceptable as a solvent, and due to oxidative heating without combustion fuel, eliminating greenhouse emissions.
На фиг.1 изображена схема предлагаемого способа разработки залежи высоковязкой нефти или битума содержащая нагнетательную скважину 1, установку термического крекинга 2, добывающую скважину 3, пласт-покрышка 4, нефтяной продуктовый пласт 5, глиняный пласт 6 и зона воздействия нагретого углеводородного растворителя 7. Figure 1 shows a diagram of the proposed method for developing a deposit of high-viscosity oil or bitumen containing an injection well 1, a thermal cracking unit 2, a production well 3, a seal formation 4, an oil product formation 5, a clay formation 6 and a zone of influence of a heated hydrocarbon solvent 7.
На фиг.1 изображены следующие потоки: Figure 1 shows the following flows:
I - поток нагретого углеводородного растворителя на закачку в пласт; I - flow of heated hydrocarbon solvent for injection into the formation;
II - поток смеси углеводородного растворителя и нефти с пониженной вязкостью;II - flow of a mixture of hydrocarbon solvent and oil with reduced viscosity;
III - поток облагороженной нефти; III - flow of refined oil;
IV - поток углеводородного растворителя; IV - hydrocarbon solvent flow;
V- поток углеводородного растворителя на закачку в пласт; V is the flow of hydrocarbon solvent for injection into the reservoir;
VI - поток излишков углеводородного растворителя. VI - flow of excess hydrocarbon solvent.
Пример осуществления заявляемого способа добычи нефти представлен в схеме с отбором нагретого углеводородного растворителя в промысловой установке термического крекинга (фиг. 1) и включает следующее. An example of the implementation of the proposed method of oil production is presented in a diagram with the selection of a heated hydrocarbon solvent in an in-field thermal cracking unit (Fig. 1) and includes the following.
Строительство, в нефтяном продуктовом пласте 5 между пласт-покрышкой 4 и глиняным пластом 6, верхней нагнетательной скважины 1 и нижней добывающей скважины 3 с горизонтальными участками, расположенными друг над другом. Construction, in the oil product formation 5 between the seal formation 4 and the clay formation 6, of an upper injection well 1 and a lower production well 3 with horizontal sections located one above the other.
Закачку в нефтяной продуктовый пласт 5 потока I, нагретого углеводородного растворителя с температурой кипения ниже 210°С в виде газожидкостной смеси с температурой до 410°С, производят через горизонтальную нагнетательную скважину 1, прогревают нефтяной продуктовый пласт с созданием зоны 7 теплового воздействия и диффузии углеводородного растворителя в нефть. Injection into the oil product formation 5 of stream I, a heated hydrocarbon solvent with a boiling point below 210°C in the form of a gas-liquid mixture with a temperature of up to 410°C, is carried out through a horizontal injection well 1, the oil product formation is heated to create a zone 7 of thermal influence and diffusion of the hydrocarbon solvent into oil.
Нагретый углеводородный растворитель в результате теплового воздействия снижает вязкость нефти, кроме того благодаря диффузии в нефть способствует ее разжижению в еще большей степени. В силу гравитационного дренажа после того, как вязкость смеси углеводородного растворителя и нефти с пониженной вязкостью станет достаточно низкой, позволяющей ей протекать через пласт к добывающей скважине 3, начинают извлечение из пласта потока II смеси углеводородного растворителя и нефти с пониженной вязкостью.
Поток II смесь углеводородного растворителя и нефти с пониженной вязкостью подают в промысловую установку термического крекинга 2, из которой выходит поток III облагороженной нефти и отбирается поток IV углеводородного растворителя. The heated hydrocarbon solvent, as a result of thermal effects, reduces the viscosity of oil, and, due to diffusion into the oil, contributes to its dilution to an even greater extent. Due to gravity drainage, after the viscosity of the mixture of hydrocarbon solvent and reduced-viscosity oil becomes low enough to allow it to flow through the formation to the production well 3, the extraction of stream II of the mixture of hydrocarbon solvent and reduced-viscosity oil from the formation begins. Stream II, a mixture of hydrocarbon solvent and oil with reduced viscosity, is supplied to the field thermal cracking unit 2, from which stream III of upgraded oil comes out and stream IV of the hydrocarbon solvent is taken.
Поток IV углеводородного растворителя делиться на выводимый поток VI излишков углеводородного растворителя и отбираемый поток V углеводородного растворителя на закачку в пласт, нагреваемый в промысловой установке термического крекинга 2. Stream IV of hydrocarbon solvent is divided into output stream VI of excess hydrocarbon solvent and withdrawn stream V of hydrocarbon solvent for injection into the formation heated in the field thermal cracking unit 2.
Таким образом в предлагаемый способ добычи нефти позволяет повысить диффузию растворителя в нефть, с одновременным исключением затрат на водоподготовку и закачку водяного пара, образующего обводненные токсичные эмульсии.
Thus, the proposed method of oil production allows increasing the diffusion of the solvent into the oil, while simultaneously eliminating the costs of water treatment and injection of water vapor, which forms water-saturated toxic emulsions.
Claims
1. Способ разработки залежи высоковязкой нефти или битума, включающий строительство двух горизонтальных скважин, расположенных одна над другой, закачку растворителя в нагнетательную скважину и отбор продукции из добывающей скважины, отличающийся тем, что в качестве растворителя закачивают нагретые углеводородные фракции с температурой кипения менее 210°С, под давлением в виде газожидкостной смеси с температурой до 410°С. 1. A method for developing a deposit of high-viscosity oil or bitumen, including the construction of two horizontal wells located one above the other, pumping a solvent into an injection well and selecting products from a production well, characterized in that heated hydrocarbon fractions with a boiling point of less than 210° are pumped in as a solvent. C, under pressure in the form of a gas-liquid mixture with a temperature of up to 410°C.
2. Способ по п. 1, отличающийся тем, что углеводородные фракции с температурой кипения менее 210°С отбирают с промысловых установок термического или термоокислительного крекинга. 2. The method according to claim 1, characterized in that hydrocarbon fractions with a boiling point of less than 210°C are taken from field thermal or thermo-oxidative cracking units.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444261A (en) * | 1982-09-30 | 1984-04-24 | Mobil Oil Corporation | High sweep efficiency steam drive oil recovery method |
| SU1487555A1 (en) * | 1987-01-05 | 1995-05-27 | Всесоюзный нефтяной научно-исследовательский геологоразведочный институт | Method for production of high-viscosity oil |
| RU2387818C1 (en) * | 2009-03-04 | 2010-04-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method to develop low-gravity high-viscosity oils |
| CA2872120A1 (en) * | 2014-11-24 | 2016-05-24 | Imperial Oil Resources Limited | Recovering hydrocarbons from an underground reservoir |
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2023
- 2023-08-25 WO PCT/RU2023/000257 patent/WO2024054129A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444261A (en) * | 1982-09-30 | 1984-04-24 | Mobil Oil Corporation | High sweep efficiency steam drive oil recovery method |
| SU1487555A1 (en) * | 1987-01-05 | 1995-05-27 | Всесоюзный нефтяной научно-исследовательский геологоразведочный институт | Method for production of high-viscosity oil |
| RU2387818C1 (en) * | 2009-03-04 | 2010-04-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method to develop low-gravity high-viscosity oils |
| CA2872120A1 (en) * | 2014-11-24 | 2016-05-24 | Imperial Oil Resources Limited | Recovering hydrocarbons from an underground reservoir |
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