CN108316910B - Well pattern structure for gas-driven development of deep block-shaped fractured reservoir and development method - Google Patents
Well pattern structure for gas-driven development of deep block-shaped fractured reservoir and development method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 57
- 239000007924 injection Substances 0.000 claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 24
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 24
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 24
- 230000005465 channeling Effects 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 139
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 53
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000005553 drilling Methods 0.000 description 9
- 239000010779 crude oil Substances 0.000 description 8
- 238000011084 recovery Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal 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
- E21B43/164—Injecting CO2 or carbonated water
-
- 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 application discloses a well pattern structure and a development method for gas drive development of deep block-shaped fractured reservoir, which relate to the field of oil gas development, wherein the well pattern structure comprises the following components: the two-branch horizontal well comprises a vertical well section extending downwards from the ground, and a first horizontal section and a second horizontal section which are connected with the vertical well section, wherein the position of the first horizontal section is higher than that of the second horizontal section, and a preset depth difference is arranged between the first horizontal section and the second horizontal section; a gas injection well located within an upper extent of the first horizontal section and the second horizontal section; the well pattern structure for gas-driven deep block-shaped fractured reservoir has at least two states, in the first state, the first horizontal section is a production section, and the second horizontal section is a closed state; in the second state, the second horizontal section is a production section, and the first horizontal section is in a closed state. The application can reduce the possibility of gas channeling phenomenon when the top gas injection develops the fractured hydrocarbon reservoir.
Description
Technical Field
The invention relates to the field of oil gas development, in particular to a well pattern structure for gas-driven development of deep block-shaped fractured reservoir and a development method.
Background
The crude oil reserves of the current fractured hydrocarbon reservoirs account for more than 30% of the total crude oil reserves in the world. Compared with conventional oil and gas reservoirs, the fractured oil and gas reservoirs have the characteristics of complex lithology and large lithofacies change. In the failure type development of a fractured hydrocarbon reservoir, when insufficient formation energy supply occurs, water injection, gas injection and other methods are generally adopted to maintain formation pressure so as to supplement formation energy. However, the base rock of the fractured hydrocarbon reservoir, the dual medium structure of the fracture and the difference between the base rock and the dual medium structure of the fracture often cause water channeling and gas channeling during the development process of water injection and gas injection, so that the fractured hydrocarbon reservoir is difficult to obtain an ideal development effect.
Practice proves that the top gas injection development can make up for the defect of water injection development of the oil and gas reservoir under certain conditions, and the method can not only improve the recovery ratio of the fractured oil and gas reservoir, but also effectively inhibit the coning of bottom water. In the process of developing a fractured hydrocarbon reservoir by top gas injection, the altitude of the oil-containing part in the hydrocarbon reservoir is continuously reduced, and if a traditional vertical well development mode is adopted, the perforating positions originally corresponding to the oil layer in the vertical well are corresponding to the gas-containing part along with the reduction of the altitude of the oil-containing part, so that serious gas channeling phenomenon can occur. In order to continue the development, new perforations and completions or re-drilling can only be continuously carried out in the vertical well according to the position of the oil-containing part, but the operation mode can greatly increase the cost, thereby bringing great economic burden to the country.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the invention is to provide a well pattern structure and a development method for gas-driven development of deep block-shaped fractured reservoirs, which can reduce the possibility of gas channeling during top gas injection development of fractured reservoirs.
The specific technical scheme of the embodiment of the invention is as follows:
a well pattern structure for gas-driven development of deep block fractured reservoirs comprising:
The two-branch horizontal well comprises a vertical well section extending downwards from the ground, and a first horizontal section and a second horizontal section which are connected with the vertical well section, wherein the position of the first horizontal section is higher than that of the second horizontal section, and a preset depth difference is arranged between the first horizontal section and the second horizontal section;
A gas injection well located within an upper extent of the first horizontal section and the second horizontal section;
the well pattern structure for gas-driven deep block-shaped fractured reservoir has at least two states, and in the first state, the first horizontal section is a production section, and the second horizontal section is in a closed state; in the second state, the second horizontal section is a production section, and the first horizontal section is in a closed state.
In a preferred embodiment, the first horizontal segment is located in the middle of the target formation and the second horizontal segment is located in the bottom of the target formation.
In a preferred embodiment, the two-branch horizontal well further comprises: the first inclined shaft section is connected with the vertical shaft section and the first horizontal section, and the second inclined shaft section is connected with the vertical shaft section and the second horizontal section.
In a preferred embodiment, the predetermined depth difference is determined by the thickness of the oil-containing part in the reservoir and the distance the oil-containing part moves down during development.
In a preferred embodiment, the angle between the first horizontal section and the second horizontal section is between 0 and 30 degrees when the first horizontal section and the second horizontal section are projected onto a horizontal plane.
In a preferred embodiment, the medium injected by the gas injection well comprises at least one of the following: carbon dioxide, nitrogen, natural gas, reduced oxygen air.
In a preferred embodiment, the length of the second horizontal segment is greater than the length of the first horizontal segment.
In a preferred embodiment, the gas injection well is located at the highest elevation of the hydrocarbon reservoir.
In a preferred embodiment, in the first state, the first horizontal section is located in the middle of the oil-containing portion of the reservoir and the second horizontal section is located at the bottom of the oil-containing portion or at the top of the water-containing portion of the reservoir.
In a preferred embodiment, in the second state, the second horizontal segment is located in the oil-bearing portion of the reservoir and the first horizontal segment is located in the gas-bearing portion or the transition zone of the oil-bearing portion to the gas-bearing portion of the reservoir.
A method of developing a well pattern structure for gas-driven development of deep block fractured reservoirs according to any one of the above, comprising the steps of:
injecting a gaseous medium into the gas injection well;
opening a first horizontal section in the two branch horizontal wells, and closing a second horizontal section, so that oil and gas reservoirs are mined through the first horizontal section;
when the preset condition is met, the first horizontal section in the two branch horizontal wells is closed, and the second horizontal section is opened, so that the oil and gas reservoirs are mined through the second horizontal section.
In a preferred embodiment, the preset condition one includes at least one of the following: the first horizontal section has a gas channeling phenomenon, a gas-containing part in the oil and gas reservoir moves downwards to contact the first horizontal section, and a gas-containing part in the oil and gas reservoir moves downwards to contact the second horizontal section.
In a preferred embodiment, the method further comprises the steps of:
And stopping injecting the gas medium into the gas injection well when the preset condition II is reached, and closing the second horizontal section in the two branch horizontal wells.
In a preferred embodiment, the second preset condition includes at least one of the following: and the second horizontal section is in gas channeling phenomenon, and a gas-containing part in the oil and gas reservoir moves downwards to contact the second horizontal section.
The technical scheme of the invention has the following remarkable beneficial effects:
Compared with the traditional vertical well injection and production well pattern, the well pattern structure and the development method for gas-driven deep block-shaped fractured oil reservoirs do not need continuous perforation and completion operation on the vertical well along with the reduction of the elevation of the oil-containing part in the stratum, and the two-branch horizontal well simultaneously has the first horizontal section and the second horizontal section, has the characteristics of large well control storage capacity and capability of communicating a plurality of fractures, and can save a large amount of drilling investment compared with a large number of vertical wells. Compared with the conventional well pattern structure with the vertical well as an injection well and the horizontal well as a production well, the well pattern structure can perform well closing operation on the first horizontal section after gas channeling occurs, and the second horizontal section is utilized to continue production, so that the gas production in an oil well can be effectively reduced, and a new horizontal well does not need to be drilled, thereby saving drilling investment.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic diagram of a well pattern structure for gas-driven development of deep block fractured reservoirs in accordance with an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a first horizontal segment produced in accordance with an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a second horizontal section of the present invention during production.
FIG. 4 is a graph showing the comparison of effects of the present invention when different patterns are used for the same reservoir.
Reference numerals of the above drawings:
1. a gas injection well; 2. two branch horizontal wells; 3. a straight well section; 4. a first inclined shaft section; 5. a first horizontal segment; 6. a second inclined shaft section; 7. a second horizontal segment; 8. a gas-containing portion; 9. an oil-containing portion; 10. an aqueous portion.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to reduce the possibility of gas channeling during the development of a fractured reservoir by top gas injection and avoid the cost increase caused by the need of re-perforating, completion or re-drilling according to the position of the oil-containing portion during the continued development of a vertical well, a well pattern structure for gas-flooding deep block fractured reservoir is proposed in the present application, and fig. 1 is a schematic structural diagram of a well pattern structure for gas-flooding deep block fractured reservoir in an embodiment of the present application, as shown in fig. 1, the well pattern structure for gas-flooding deep block fractured reservoir may include: the two-branch horizontal well 2 comprises a vertical well section 3 extending downwards from the ground, a first horizontal section 5 and a second horizontal section 7 which are connected with the vertical well section 3, wherein the position of the first horizontal section 5 is higher than that of the second horizontal section 7, and a preset depth difference is arranged between the first horizontal section 5 and the second horizontal section 7; gas injection well 1, gas injection well 1 being located in the upper extent of first horizontal section 5 and second horizontal section 7; the well pattern structure for gas-driven deep block-shaped fractured reservoir has at least two states, in the first state, the first horizontal section 5 is a production section, and the second horizontal section 7 is in a closed state; in the second state, the second horizontal section 7 is the production section, and the first horizontal section 5 is in a closed state.
Specifically, the first horizontal section 5 is located in the middle of the target formation, that is, in the position of the crude oil layer at the beginning of gas injection development, and may be, for example, in the middle of the oil-containing portion, and the second horizontal section 7 is located in the bottom of the target formation, that is, in the position of the formation water at approximately the beginning of gas injection development, and may be, for example, in the bottom of the oil-containing portion or the top of the water-containing portion of the gas reservoir. The first horizontal section 5 and the second horizontal section 7 have a preset depth difference therebetween, which is determined by the thickness of the oil-containing part in the reservoir and the distance the oil-containing part moves down during development. The greater the distance the oil-containing portion moves down during development, the greater the preset depth differential, and the greater the thickness of the oil-containing portion in the reservoir, the greater the preset depth differential.
The first horizontal section 5 and the second horizontal section 7 may be in different vertical planes, and the first horizontal section 5 and the second horizontal section 7 only need to meet the altitude below the altitude of the gas injection well 1 due to the certain area of the hydrocarbon reservoir. Of course, in order to enable crude oil at different positions in the hydrocarbon reservoir to flow into the first horizontal section 5 or the second horizontal section 7 respectively, when the first horizontal section and the second horizontal section are projected onto the horizontal plane, the included angle between the first horizontal section 5 and the second horizontal section 7 may be between 0 degrees and 30 degrees, and in particular, factors such as the distribution of main cracks in the stratum and the actual structural shape of the stratum in the actual drilling process need to be considered.
The lengths of the first horizontal section 5 and the second horizontal section 7 in the two branch horizontal wells 2 can be equal or different. Since the gas injection process continues and the crude oil is continuously enriched, the oil-containing zone is continuously in the process of expanding, and of course, the oil saturation therein is also continuously increasing, so that in order to achieve higher oil recovery efficiency, in a preferred embodiment the length of the second horizontal section 7 will be greater than the length of the first horizontal section 5. Of course, in some embodiments, the length of the second horizontal section 7 may be smaller than the length of the first horizontal section 5, which may be determined according to factors such as the actual fracture distribution in the formation and the actual formation shape.
To facilitate the actual drilling, the two-branch horizontal well 2 further comprises a first inclined section 4 connecting the straight section 3 and the first horizontal section 5, and a second inclined section 5 connecting the straight section 3 and the second horizontal section 7.
Compared with the traditional vertical well injection and production system, the single well control area is small, the injection amount and the production amount corresponding to the injection well and the production well are small, and in order to realize the effective development of the hydrocarbon reservoir, a large number of vertical wells need to be drilled, and the method can cost huge funds. Meanwhile, as gas injection from the top of the reservoir continues, the elevation of the oil-bearing portion 9 in the formation may decrease. This causes the perforations in the vertical well that would otherwise correspond to the oil-containing portion 9 to correspond to the gas-containing portion 8, which in turn causes severe gas channeling. Therefore, under the traditional system, the oil and gas reservoir development can be continued only by continuously re-perforating, completing or drilling new wells, and the operation development mode further costs more cost and is a relatively uneconomical development mode.
In the well pattern structure for gas-driven deep block fractured reservoir according to the present application, fig. 2 is a cross-sectional view of injection and production during production of the first horizontal segment 5 in the embodiment of the present application, as shown in fig. 2, the position of the gas injection well 1 may be located at the highest elevation point of the hydrocarbon reservoir, and the gas injection well 1 is generally a vertical well. A gas medium, which may be carbon dioxide, nitrogen, natural gas, reduced oxygen air, or the like, is injected into the hydrocarbon reservoir through the gas injection well 1. During the injection of the gaseous medium, the well pattern structure for gas flooding of the deep block fractured reservoir is in a first state. In the first state, the first horizontal section 5 is a production section, the first horizontal section 5 being located in the middle of the oil-containing part 9 of the reservoir and the second horizontal section 7 being located at the bottom of the oil-containing part 9 or at the top of the water-containing part 10 of the reservoir. In this state, the oil-containing part 9 of the reservoir is produced by the first horizontal section 5, and the second horizontal section 7 may be in a closed state to avoid water from the water-containing part 10 of the reservoir from entering the two-branch horizontal well 2. With the continuous proceeding of gas injection exploitation of the hydrocarbon reservoir, the top of the hydrocarbon reservoir is continuously injected with gas, the injected gas gathers at the top of the hydrocarbon reservoir under the action of gravity and gradually moves downwards, so that the altitudes of the gas-containing part 8, the oil-containing part 9 and the water-containing part 10 in the hydrocarbon reservoir gradually decrease, and when the first horizontal section 5 contacts with the gas-containing part 8, the well pattern structure for gas-driven deep block-shaped fractured reservoir changes into the second state when the first horizontal section 5 starts to generate gas channeling phenomenon. Fig. 3 is a cross-sectional view of the second horizontal segment 7 in the embodiment of the present application, as shown in fig. 3, in the second state, the second horizontal segment 7 is a production segment, the second horizontal segment 7 is located in the oil-containing portion 9 of the oil-gas reservoir, and the first horizontal segment 5 is located in the gas-containing portion 8 of the oil-gas reservoir or a transition zone between the oil-containing portion 9 and the gas-containing portion 8. In this state, the oil-containing portion 9 of the reservoir is exploited by the second horizontal section 7, and the first horizontal section 5 can be in a closed state to avoid gas from the gas-containing portion 8 of the reservoir from entering the two-branch horizontal well 2, thus completely avoiding the possibility of gas channeling during top gas injection development.
The method for developing the deep block fractured reservoir by gas flooding can adopt the following development method, and the method can comprise the following steps: firstly, injecting a gas medium, such as carbon dioxide, nitrogen, natural gas, oxygen-reduced air and the like, into a gas injection well, and enabling crude oil in a hydrocarbon reservoir above a first horizontal section 5 in the two-branch horizontal well 2 to be displaced downwards by the gas medium through the injection of the gas medium. The first horizontal leg 5 of the two branch horizontal well 2 is then opened and the second horizontal leg 7 is closed so that the reservoir is produced by the first leg 5, whereupon the second leg 7 may be on top of the water containing portion 10 of the reservoir and thus need to be closed. As gas injection from the top of the reservoir continues, the elevation of the oil-bearing portion 9 in the formation is lowered, so that the perforation of the first horizontal section 5, which corresponds to the oil-bearing portion 9, is turned to correspond to the gas-bearing portion 8, and therefore, when the preset condition is met, the first horizontal section 5 of the two branch horizontal wells is closed, so that the gas medium is prevented from entering the first horizontal section 5, and the second horizontal section 7 is opened, so that the reservoir is mined through the second horizontal section 7. The preset condition one may include at least one of: the first horizontal section 5 has the phenomenon of gas channeling, the gas-containing part in the oil and gas reservoir moves downwards to contact the first horizontal section 5, the oil-containing part in the oil and gas reservoir moves downwards to contact the second horizontal section 7, and the like. As gas injection production at the top of the reservoir continues, the elevation of the oil-bearing portion 9 in the formation continues to decrease, and eventually the gas-bearing portion 8 descends into contact with the second horizontal section 7, and the oil-bearing portion 9 descends below the second horizontal section 7, so that when a second predetermined condition is reached, the second predetermined condition may include at least one of: the second horizontal section 7 is subjected to gas channeling, the gas-containing portion 8 in the hydrocarbon reservoir moves downward to contact the second horizontal section 7, and the like, the injection of the gaseous medium into the gas injection well 1 is stopped, and the second horizontal section 7 in the two-branch horizontal well is closed, and thus the production is stopped. For a fractured hydrocarbon reservoir, the bedrock medium is the primary reservoir space for the fluid and the fractured medium is the primary percolation path. Indoor experimental study shows that as the permeability difference between the fracture medium and the bedrock medium is huge, if water injection development is adopted, water can rapidly flow to a production well along the fracture direction so as to lead to small swept area, and thus, the water flooding extraction degree is only about 14.8%. In the top gas injection development, because the gas has lower density compared with the crude oil of the stratum, the gas can be gathered at the top of the oil reservoir under the action of gravity and gradually moves downwards, so that the swept volume of the oil reservoir is remarkably increased, the gas injection development and extraction degree can reach 41.3 percent and is far higher than the water flooding and extraction degree, and therefore, the deep block-shaped fractured hydrocarbon reservoir is exploited by injecting a gas medium into the hydrocarbon reservoir through the gas injection well 1. Fig. 4 is a comparison graph of effects of the present application when different well pattern structures are used for the same reservoir, as shown in fig. 4, and well pattern structures for gas-driven deep block fractured reservoirs, vertical well injection well pattern structures, and well pattern structures in which vertical wells are gas injection well horizontal wells and production wells are compared with each other by combining with calculation of a reservoir numerical simulation example, as can be seen from fig. 4: the final recovery degree of the well pattern structure for gas-driven deep block-shaped fractured reservoir is 54.5%, and compared with a vertical well injection well pattern structure and a well pattern structure with a vertical well as a gas injection well and a horizontal well as a production well, the recovery ratio is respectively improved by 33.1% and 13.2%.
The well pattern structure for gas-driven deep block-shaped fractured reservoir and the development method thereof have the following beneficial effects: compared with the traditional vertical well injection and production well pattern, the well pattern structure for gas-driven deep block-shaped fractured reservoir does not need continuous perforation and completion operation on the vertical well along with the decrease of the elevation of the oil-containing part 9 in the stratum, and the two-branch horizontal well 2 simultaneously has the first horizontal section 5 and the second horizontal section 7, has the characteristics of large well control storage capacity and capability of communicating a plurality of cracks, and can save a large amount of drilling investment compared with a plurality of vertical wells. Compared with the conventional well pattern structure with the vertical well as an injection well and the horizontal well as a production well, the application can perform well closing operation on the first horizontal section 5 after gas channeling occurs, and the second horizontal section 7 is utilized to continue production, so that the gas yield in the oil well can be effectively reduced, and a new horizontal well does not need to be drilled, thereby not only increasing the crude oil yield, but also saving the drilling investment. The well pattern structure for gas-driven deep block-shaped fractured reservoir can realize higher utilization of underground resources, and has certain economic significance and environmental protection significance.
The foregoing embodiments in the present specification are all described in a progressive manner, and the same and similar parts of the embodiments are mutually referred to, and each embodiment is mainly described in a different manner from other embodiments. All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional.
Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
The foregoing description of the embodiments of the present invention is merely illustrative, and the present invention is not limited to the embodiments described above. Any person skilled in the art can make any modification and variation in form and detail of the embodiments without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.
Claims (11)
1. The development method of the well pattern structure for gas-driven deep massive fractured reservoir is characterized in that the well pattern structure for gas-driven deep massive fractured reservoir comprises the following steps:
the two-branch horizontal well comprises a vertical well section extending downwards from the ground, and a first horizontal section and a second horizontal section which are connected with the vertical well section, wherein the position of the first horizontal section is higher than that of the second horizontal section, and a preset depth difference is arranged between the first horizontal section and the second horizontal section; the first horizontal section is positioned in the middle of the target stratum, and the second horizontal section is positioned at the bottom of the target stratum;
A gas injection well located within an upper extent of the first horizontal section and the second horizontal section;
The well pattern structure for gas-driven deep block-shaped fractured reservoir has at least two states, and in the first state, the first horizontal section is a production section, and the second horizontal section is in a closed state; in a second state, the second horizontal section is a production section, and the first horizontal section is in a closed state;
the development method for gas-driven deep block-shaped fractured reservoir comprises the following steps:
injecting a gaseous medium into the gas injection well;
opening a first horizontal section in the two branch horizontal wells, and closing a second horizontal section, so that oil and gas reservoirs are mined through the first horizontal section;
When a preset condition is met, closing a first horizontal section in the two branch horizontal wells, and opening a second horizontal section, so that the oil and gas reservoir is mined through the second horizontal section; the preset condition one at least comprises one of the following: the first horizontal section has a gas channeling phenomenon, a gas-containing part in the oil and gas reservoir moves downwards to contact the first horizontal section, and a gas-containing part in the oil and gas reservoir moves downwards to contact the second horizontal section.
2. The method of developing a well pattern structure for gas-driven deep block fractured reservoir of claim 1, wherein the two-branch horizontal well further comprises: the first inclined shaft section is connected with the vertical shaft section and the first horizontal section, and the second inclined shaft section is connected with the vertical shaft section and the second horizontal section.
3. The method of claim 1, wherein the predetermined depth difference is determined by a thickness of an oil-containing portion in the hydrocarbon reservoir and a distance by which the oil-containing portion moves down during the development process.
4. The method of claim 1, wherein the angle between the first horizontal section and the second horizontal section is between 0 degrees and 30 degrees when the first horizontal section and the second horizontal section are projected onto a horizontal plane.
5. The method of developing a well pattern structure for gas-driven deep block fractured reservoir of claim 1, wherein the medium injected by the gas injection well comprises at least one of: carbon dioxide, nitrogen, natural gas, reduced oxygen air.
6. The method of developing a well pattern structure for gas-driven deep block fractured reservoir of claim 1, wherein the second horizontal segment has a length greater than a length of the first horizontal segment.
7. The method of developing a well pattern structure for gas-driven deep block fractured reservoir of claim 1, wherein the gas injection well is located at an elevation highest point of the hydrocarbon reservoir.
8. The method of claim 1, wherein in a first state the first horizontal section is located in the middle of the oil-bearing portion of the reservoir and the second horizontal section is located at the bottom of the oil-bearing portion or at the top of the water-bearing portion of the reservoir.
9. The method of claim 1, wherein in the second state, the second horizontal segment is located in an oil-bearing portion of the reservoir and the first horizontal segment is located in a gas-bearing portion of the reservoir or a transition zone between the oil-bearing portion and the gas-bearing portion.
10. The method of developing a well pattern structure for gas-driven deep block fractured reservoir of claim 1, further comprising the steps of:
And stopping injecting the gas medium into the gas injection well when the preset condition II is reached, and closing the second horizontal section in the two branch horizontal wells.
11. The method for developing a well pattern structure for gas-driven deep block fractured reservoir according to claim 1, wherein the preset condition two comprises at least one of the following: and the second horizontal section is in gas channeling phenomenon, and a gas-containing part in the oil and gas reservoir moves downwards to contact the second horizontal section.
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| CN109339752A (en) * | 2018-11-19 | 2019-02-15 | 中国石油天然气股份有限公司大港油田分公司 | Oil reservoir development method based on the phlogisticated air displacement of reservoir oil |
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