CN112012704B - Based on CO2Displacement multi-layer oil and gas resource co-production method - Google Patents
Based on CO2Displacement multi-layer oil and gas resource co-production method Download PDFInfo
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- CN112012704B CN112012704B CN202011028071.4A CN202011028071A CN112012704B CN 112012704 B CN112012704 B CN 112012704B CN 202011028071 A CN202011028071 A CN 202011028071A CN 112012704 B CN112012704 B CN 112012704B
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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
- E21B43/164—Injecting CO2 or carbonated water
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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
- E21B43/006—Production of coal-bed methane
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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
- E21B43/14—Obtaining from a multiple-zone well
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention provides a method for preparing a catalyst based on CO2The displacement multilayer oil and gas resource co-production method comprises the steps of completing two groups of butt-jointed wells in drilling construction, wherein the two groups of butt-jointed wells are communicated through a common vertical well; after the first-stage extraction operation is finished, CO injection is carried out2And (3) performing step-by-step displacement operation, wherein in the displacement process, firstly, the product in the first displacement stage is directly converted into the displacement agent in the second displacement stage, so that multilayer oil and gas resource co-production is realized. The invention relates to a gas lift extraction technology for shale oil and compact oil, which is mainly based on CO2、CH4The gas can effectively reduce the fluid viscosity and density of shale oil and compact oil and improve the fluid saturation pressure, in addition, the carbon dioxide can also improve the physical properties of a reservoir to a certain extent, improve the permeability of the reservoir and realize the synchronous exploitation of multilayer oil and gas resources; the original methane in the reservoir is used as a target product and a displacing agent, external introduction is not needed, the comprehensive displacing effect is better, and the oil gas recovery rate is higher.
Description
Technical Field
The invention belongs to the technical field of shale oil gas, and particularly relates to a gas-oil separator based on CO2A displacement multi-layer oil and gas resource co-production method.
Background
The situation that coal bed gas, dense oil gas and conventional oil gas resources are simultaneously gathered at different positions of the same basin is quite common. Taking an Erdos basin as an example, a Jurassic coal field in a southern corner region of the basin has good coal bed gas resource potential, meanwhile, a three-fold system is covered under the Jurassic coal field, so that the group length is prolonged to 2+3 sections, conventional sandstone gas resources are enriched, shale oil and gas resources are enriched simultaneously in 7 sections and 9 sections, and tight oil resources are enriched in 8 sections of sandstone.
The oil and gas exploitation method generally comprises three types, namely, self-injection well oil exploitation, mechanical oil exploitation and gas exploitation, the basic purpose of oil and gas exploitation is to extract oil and gas resources stored in a reservoir as much as possible, improve the recovery rate and reduce the cost, two problems to be solved in a centralized way in the oil and gas exploitation are respectively how to lift crude oil in a well to the ground and convey the crude oil out and how to make the crude oil in the formation flow to the bottom of the well, and when an oil layer has energy enough to drive the oil from the reservoir to the bottom of the well and lift the oil out of a wellhead from the bottom of the well, the method for oil exploitation by means of natural energy of the oil layer is called as a self-injection oil exploitation method. When the energy of an oil layer is not enough to maintain the self-blowout or can not be self-blowout, the crude oil can be lifted out of a wellhead only by artificially supplementing energy from the ground, if the energy is supplemented in a mode of pumping the oil to the ground by using mechanical energy, the method is called mechanical oil extraction, and the mechanical oil extraction is generally divided into sucker-rod oil extraction, rodless oil extraction and gas-lift oil extraction. The injection of carbon dioxide, oxygen-free air, N2, hydrocarbon gas and the like into the oil-gas reservoir all belong to gas lift oil extraction.
In the prior art, a layered mining method is generally adopted in a multilayer oil-gas layer, and the method is generally suitable for conventional oil-gas mining, has poor applicability to reservoirs such as coal bed gas, shale oil, tight oil and the like, is difficult to realize synchronous mining of multilayer oil-gas resources and has low recovery ratio.
Disclosure of Invention
In view of the above background, the present invention provides a CO-based catalyst2A displacement multi-layer oil and gas resource co-production method.
In order to achieve the purpose, the invention provides the following technical scheme:
based onCO2The displacement multilayer oil and gas resource co-production method comprises the following steps:
the method comprises the following steps that firstly, two groups of butt wells are excavated and communicated;
step two, the butt-joint wells are divided into deep butt-joint wells and shallow butt-joint wells, the horizontal sections of the shallow butt-joint wells penetrate through the coal bed to form coal bed gas wells, the horizontal sections of the deep butt-joint wells penetrate through the oil shale layers to form shale oil wells, each butt-joint well comprises a horizontal section and a vertical section, fracturing operation is carried out on the horizontal sections in the wells, and first-stage extraction is carried out on part of shale oil gas resources of the coal bed gas and the oil shale layers of the extracted coal bed without displacement operation;
step three, after the first-stage extraction is completed, completing the subsequent displacement operation, comprising the following steps of: injecting carbon dioxide into a coal bed gas reservoir through a coal bed gas well, displacing the coal bed gas, and closing a first separation plug and a second separation plug in the gas injection process; secondly, opening a second separation plug communicated with the underground part after keeping the pressure in the coal-bed gas well stable for a certain time, keeping a shale oil well mouth closed, continuing injecting carbon dioxide into the coal-bed gas well at the moment, enabling the displacement gas to enter the shale oil layer downwards, keeping the pressure in the coal-bed gas well stable, and meanwhile realizing the continuous displacement of oil gas resources in the oil shale layer; thirdly, opening the shale oil well to start extraction operation after the pressure is stabilized for a certain time;
and step four, circularly implementing the step three until the extraction is finished, and finishing the extraction operation.
In the above technical solution, the CO is2By substitution of other gases, including hydrocarbon gases, or N2。
In the technical scheme, the butt-joint well communication method comprises the step of directly communicating or communicating two groups of butt-joint wells by sharing one straight well.
In the technical scheme, the displacement process is carried out step by step, firstly, displacement of a gas-producing target layer is carried out, and then, a product obtained by displacement is converted into a displacement agent of an oil-producing target layer to carry out second-step displacement operation.
In the technical scheme, the pressure stability range is calculated and predicted by combining oil and gas components with a state equation and a formation temperature condition, and the obtained fluid saturation pressure is the lower pressure limit. The pressure stabilization time is generally not less than 24 h.
The invention relates to a gas lift extraction technology for shale oil and compact oil, which is mainly based on CO2Or CH4The gas can effectively reduce the fluid viscosity and density of shale oil and compact oil, and improve the characteristic of fluid saturation pressure, and in addition, carbon dioxide can also improve the physical properties of a reservoir to a certain extent, so that the permeability of the reservoir is improved. The synchronous exploitation of multilayer oil and gas resources can be realized; the original methane in the reservoir is used as a target product, and is used as a displacement agent, so that external introduction is not needed, the comprehensive displacement effect is better, and the oil gas recovery rate is higher.
Drawings
In order to more clearly illustrate the embodiments of the patent of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the patent of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a schematic structural view of example 1 of the present invention;
wherein, 1 shale oil layer; 2, rock stratum; 3, a coal bed gas layer; 4 shale oil wells; 5, a coal bed gas well; 6, connecting with a well; 7, a first separating plug; and 8, separating a second plug.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the present patent application without inventive step, shall fall within the scope of protection of the present patent application.
According to FIG. 1, a CO-based system is shown as an example2Displaced multi-layer oil and gas resourcesThe co-production method comprises the following steps:
the drilling construction is completed, two groups of butt-jointed wells are communicated through a communicating vertical well, and the method for communicating the two groups of butt-jointed wells can also comprise the step of communicating the two groups of butt-jointed wells by sharing one vertical well;
step two, the butt-joint well of the embodiment is divided into a deep butt-joint well and a shallow butt-joint well, the horizontal section of the shallow butt-joint well penetrates through a coal bed to form a coal bed gas well, the horizontal section of the deep butt-joint well penetrates through an oil shale layer to form a shale oil well, the butt-joint well comprises a horizontal section and a vertical section, the fracturing operation is carried out on the horizontal section under the well, and the first-stage extraction is carried out on the coal bed gas of the extracted coal bed and the shale oil gas resource of the oil shale layer without displacement operation;
step three, after the first-stage extraction is completed, completing the subsequent displacement operation, comprising the following steps of: injecting carbon dioxide into a coal bed gas reservoir through a coal bed gas well, displacing the coal bed gas, and closing a first separation plug and a second separation plug in the gas injection process; secondly, opening a second separation plug communicated with the underground part after keeping the pressure in the coal-bed gas well stable for a certain time, keeping a shale oil well mouth closed, continuing injecting carbon dioxide into the coal-bed gas well at the moment, enabling the displacement gas to enter the shale oil layer downwards, keeping the pressure in the coal-bed gas well stable, and meanwhile realizing the continuous displacement of oil gas resources in the oil shale layer; thirdly, opening the shale oil well to start extraction operation after the pressure is stabilized for a certain time; the pressure stability range is calculated and predicted by combining oil and gas components with a state equation and a formation temperature condition, and the obtained fluid saturation pressure is the lower pressure limit. The pressure stabilization time is generally not less than 24 h.
And step four, circularly implementing the step three until the extraction is finished, and finishing the extraction operation.
In the shale oil and dense oil gas lift extraction technology, fluid property reconstruction can be performed by injecting hydrocarbon gas, particularly, the addition of methane can greatly reduce the fluid viscosity and density of shale oil or dense oil, increase the fluid mobility and improve the oil gas resource recovery ratio, and compared with carbon dioxide, the methane has stronger reconstruction capability on the fluid property, and CO is stronger2Adopt itOther gases including hydrocarbon gases, or N2. In the third step of the invention, the displacement process is mainly used for displacing coal bed gas by carbon dioxide, so that a certain amount of methane gas is obtained in the system; and the second step is mainly used for displacing the shale oil by using the methane and carbon dioxide mixed gas, and the step is completed based on that the methane and carbon dioxide mixed gas obtained in the first step enters a shale oil reservoir.
The method is only one of various conditions, coal bed gas or shale gas can be used as a lower reservoir, shale oil or compact oil can be used as an upper reservoir, and the extraction can be carried out by the method, but the well body structure is slightly different from the exemplified process, but the general idea is not changed. In addition, the upper and lower groups of reservoirs in fig. 1 are parallel to each other, and may have a certain difference in the horizontal direction in the actual operation process, and the well structure needs to be adjusted to some extent in combination with the geological reality in the construction process.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall be covered by the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (5)
1. Based on CO2The displacement multi-layer oil and gas resource co-production method is characterized by comprising the following steps: the method comprises the following steps:
step one, drilling construction is completed, two groups of butt joint wells are formed, and the two groups of butt joint wells are communicated;
step two, the butt-joint wells are divided into deep butt-joint wells and shallow butt-joint wells, the horizontal sections of the shallow butt-joint wells penetrate through the coal bed to form coal bed gas wells, the horizontal sections of the deep butt-joint wells penetrate through the oil shale layers to form shale oil wells, each butt-joint well comprises a horizontal section and a vertical section, fracturing operation is carried out on the horizontal sections in the wells, and first-stage extraction is carried out on the coal bed gas of the extracted coal bed and the shale oil gas resources of the oil shale layers without displacement operation;
and step three, after the first-stage extraction is finished, implementing subsequent displacement operation, including: injecting carbon dioxide into a coal bed gas reservoir through a coal bed gas well, displacing the coal bed gas, and closing a first separation plug and a second separation plug in the gas injection process; secondly, opening a second separation plug communicated with the underground part after keeping the pressure in the coal-bed gas well stable for a certain time, keeping a shale oil well mouth closed, continuing injecting carbon dioxide into the coal-bed gas well at the moment, enabling mixed gas obtained by displacing the coal bed to enter the shale oil layer downwards, keeping the pressure in the coal-bed gas well stable, and meanwhile realizing continuous displacement of oil and gas resources in the oil shale layer; thirdly, opening the shale oil well to start extraction operation after the pressure is stabilized for a certain time;
and step four, circularly implementing the step three until the extraction is finished, and finishing the extraction operation.
2. CO-based composition according to claim 12The displacement multi-layer oil and gas resource co-production method is characterized by comprising the following steps: the butt well communication method comprises the step of directly communicating or communicating two groups of butt wells by sharing a straight well.
3. CO-based composition according to claim 1 or 22The displacement multi-layer oil and gas resource co-production method is characterized by comprising the following steps: the CO is2Substituted by other gases, including hydrocarbon gases, N2。
4. CO-based composition according to claim 12The displacement multi-layer oil and gas resource co-production method is characterized by comprising the following steps: the displacement process is carried out step by step, firstly, the displacement of the gas-producing target layer is carried out, and then, the product obtained by the displacement is converted into the displacement agent of the oil-producing target layer to carry out the second-step displacement operation.
5. CO-based composition according to claim 12The displacement multi-layer oil and gas resource co-production method is characterized by comprising the following steps: the pressure stability range is calculated and predicted by combining oil and gas components with a state equation and the formation temperature condition, and the obtained fluid saturation pressureThe force is the lower pressure limit, and the pressure stabilizing time is generally not less than 24 h.
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| CN115030700B (en) * | 2022-04-26 | 2023-04-18 | 安徽理工大学 | Oil gas extraction system for fracturing oil gas reservoir by utilizing coal bed gas |
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