CN115324542A - Multi-well-gap water injection oil extraction method and system for horizontal well with low-permeability tight reservoir - Google Patents
Multi-well-gap water injection oil extraction method and system for horizontal well with low-permeability tight reservoir Download PDFInfo
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- 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
- E21B43/20—Displacing by water
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- E21B—EARTH OR ROCK 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
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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention provides a method and a system for water injection and oil extraction between multiple well seams of a horizontal well of a low-permeability tight oil reservoir, which comprise the following steps: injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network; judging whether the crack distribution mode of the fracturing cracks in the target crack network is zipper type cracks or not; and if the fracture is a zipper-type fracture, determining a development fracture zone on the target horizontal well, determining the development fracture zone as a central water injection section, determining the fracturing fracture which is adjacent on two sides of the development fracture zone and surrounds into an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal central line of the oil extraction regular hexagon. The invention realizes multi-well gap type reverse seven-point method area water injection, can eliminate the influence of gap interference, fully exerts linear water injection and radial displacement, enlarges the water injection sweep range, increases the effective well, and improves the oil displacement efficiency and the single well yield.
Description
Technical Field
The invention belongs to the technical field of geological resources and geological engineering, and particularly relates to a method and a system for water injection and oil extraction between multiple well seams of a horizontal well of a low-permeability tight reservoir.
Background
The area water injection method is widely applied to oil and gas reservoir development, and after water injection of low-permeability, ultra-low-permeability and compact oil reservoirs, cracks are easily induced to expand and extend, so that a complex target crack network is formed. The dynamic fracture formed after the natural fracture is expanded is reasonably utilized, the injected water can achieve the effect of uniform displacement as far as possible, and the method is a difficult point for researching the development mode of the existing fractured compact oil reservoir. In order to solve the problems of fast yield reduction and obvious ineffective water injection after multiple times of water injection huff and puff of low-permeability, ultra-low-permeability and compact oil reservoirs, each oil field adopts a new development mode. The Changqing oilfield adopts a rhombic nine-point reverse well pattern, so that the development effect is obvious, but the injection-production mode is only suitable for a symmetrical seam arrangement mode (namely, fracturing fractures on two sides of a horizontal well are symmetrically distributed), and is not suitable for an oil reservoir in a pull-chain seam arrangement mode (namely, fracturing fractures on two sides of the horizontal well are distributed in a staggered mode).
In an ultra-low permeability reservoir block of a Changqing oil field, a multi-stage fracturing horizontal well same-well asynchronous injection and production mode is adopted to convert inter-well displacement into inter-well displacement, but inter-well interference is ignored, and the phenomenon of non-uniform displacement caused by inter-well interference is obvious, so that the water injection efficiency is low, and the method is not suitable for ultra-low permeability compact reservoirs with anisotropic physical properties.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides a water injection oil extraction method and system between multiple well seams of a horizontal well of a low-permeability compact oil reservoir, and aims to solve the technical problem that the water injection efficiency of the low-permeability compact oil reservoir is low in the prior art.
In order to achieve the purpose, the invention provides a water injection oil extraction method among multiple well seams of a low-permeability tight reservoir horizontal well, wherein the water injection oil extraction method among the multiple well seams of the low-permeability tight reservoir horizontal well comprises the following steps:
injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network;
judging whether the crack distribution mode of the fracturing cracks in the target crack network is zipper type cracks or not;
and if the fracture is a zipper-type fracture, determining a development fracture zone on the target horizontal well, determining the development fracture zone as a central water injection section, determining the fracturing fracture which is adjacent on two sides of the development fracture zone and surrounds into an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal central line of the oil extraction regular hexagon.
In an embodiment of the present invention, the expanding natural fractures and communicating the fracture fractures to form a target fracture network includes:
establishing a well group geological model, performing numerical simulation on a target horizontal well by using an oil deposit method according to the well group geological model based on model size parameters, reservoir parameters, fluid parameters and well parameters and by combining dynamic data and well testing data of the target horizontal well, fitting production history and obtaining a fracture propagation permeability simulation diagram;
and acquiring the target fracture network with stable natural fracture permeability and fracturing fracture permeability according to the change trends of the natural fracture permeability and the fracturing fracture permeability along with the water injection time in the fracture expansion permeability simulation diagram.
In an embodiment of the present invention, the expanding natural fractures and communicating the fracture fractures to form a target fracture network includes:
according to the well group geological model, combining with dynamic monitoring data, carrying out numerical simulation on a target horizontal well by using an oil deposit method, fitting production history, and obtaining a pressure change curve of the target horizontal well;
and determining the target fracture network according to the variation trend of the pressure variation curve along with the water injection time.
In an embodiment of the present invention, the pressure variation curve includes: a matrix pressure change curve, a natural fracture pressure change curve, and a fracture pressure change curve.
In an embodiment of the present invention, the determining a target fracture network according to a variation trend of the pressure variation curve along with the water injection time includes:
and comparing the natural fracture pressure change curve, the matrix pressure change curve and the fracturing fracture pressure change curve to obtain the target fracture network with large pressure difference and consistent pressure change trend.
In an embodiment of the present invention, the comparing the natural fracture pressure variation curve, the matrix pressure variation curve and the fracture pressure variation curve to obtain the target fracture network with large pressure difference and consistent pressure variation trend includes:
acquiring a first inflection point of matrix pressure increase slowing in the matrix pressure change curve after water injection begins;
acquiring a second inflection point of the decrease of the matrix pressure after the first inflection point;
acquiring a third inflection point of the slow increase of the matrix pressure after the second inflection point;
and determining the target fracture network according to the third inflection point.
In an embodiment of the present invention, the expanding natural fractures and communicating the fracture fractures to form a target fracture network includes:
and determining a target fracture network with stable natural fracture permeability and fracture permeability by combining the third inflection point.
In an embodiment of the present invention, the determining the developed fracture zone on the target horizontal well comprises:
and determining a dynamic fracture channel with high flow conductivity according to the fracture propagation permeability simulation diagram, and determining the development fracture zone according to the dynamic fracture channel with high flow conductivity.
In an embodiment of the present invention, the determining the developmental fracture band from the high conductivity dynamic fracture channel comprises:
determining the developmental fracture band in combination with the highly conductive dynamic fracture channel and the pressure change curve.
The invention also provides a water injection oil extraction system between the multiple well seams of the horizontal well with the low-permeability tight oil reservoir, which comprises the following components:
the data simulation module is used for injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network;
and the data analysis module is used for judging whether the fracture arrangement mode of the fracturing fractures in the target fracture network is a zipper-type fracture, if so, determining a development fracture zone on the target horizontal well and determining the development fracture zone as a central water injection section, determining the fracturing fractures of which two sides are adjacent and which form an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal center line of the oil extraction regular hexagon.
Through the technical scheme, the multi-well-gap water injection oil extraction method for the horizontal well with the low-permeability tight oil reservoir has the following beneficial effects:
the water injection huff and puff is converted into multi-well-seam type inverse seven-point method area water injection, so that ineffective water injection can be avoided, swept area is increased, oil displacement efficiency is improved, and yield of an oil production section is increased. By utilizing the uniform displacement of a target fracture network high flow guide channel and a multi-well inter-seam area water injection method, the improvement of the multi-well inter-seam area water injection efficiency and the residual oil utilization degree by a reverse seven-point method is realized, and the technical support is provided for the formulation of a subsequent inter-section encryption and adjustment scheme and a three-dimensional well network design scheme. The invention realizes the multi-well inter-joint reverse seven-point method area water injection, can eliminate the influence of inter-joint interference, fully exerts linear water injection and radial displacement, expands the water injection sweep range, increases the effective wells, improves the oil displacement efficiency and the single well yield, and provides important technical guidance for the development scheme and measures of water injection in the area of low-permeability, ultra-low-permeability and compact oil reservoirs.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for injecting water between multiple well seams of a low-permeability tight reservoir horizontal well to recover oil according to an embodiment of the invention;
FIG. 2 is a schematic illustration of an injection and production unit on a target horizontal well according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a plurality of injection and production units on a target horizontal well according to an embodiment of the present invention;
FIG. 4 is a graph of a simulation of fracture propagation permeability at the initial stage of waterflooding in accordance with an embodiment of the present invention;
FIG. 5 is a graphical illustration of a simulation of fracture propagation permeability at mid-waterflood in accordance with an embodiment of the present invention;
FIG. 6 is a graph of a simulation of fracture propagation permeability at a late stage of waterflooding in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of a pressure curve according to an embodiment of the present invention;
FIG. 8 is a table of numerical simulation parameters according to an embodiment of the present invention.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The method for water injection and oil production among multiple well gaps of the low-permeability tight reservoir horizontal well is described below with reference to the attached drawings.
As shown in fig. 1, in an embodiment of the present invention, a method for extracting oil by water injection between multiple well seams of a low-permeability tight reservoir horizontal well is provided, and in a first embodiment of the method for extracting oil by water injection between multiple well seams of a low-permeability tight reservoir horizontal well, the method for extracting oil by water injection between multiple well seams of a low-permeability tight reservoir horizontal well includes:
s10, injecting water into a target horizontal well, expanding natural cracks and communicating fractured cracks to form a target crack network;
s20, judging whether the crack distribution mode of the fracturing cracks in the target crack network is zipper type cracks or not;
and S30, if the fracture is a zipper-type fracture, determining a development fracture zone on the target horizontal well, determining the development fracture zone as a central water injection section, determining fracture fractures which are adjacent on two sides of the development fracture zone and enclose a regular oil recovery hexagon as an oil recovery section, and taking the central water injection section as a diagonal centerline of the regular oil recovery hexagon.
It can be understood that, as shown in fig. 2, the horizontal line represents a target horizontal well, the six oil recovery sections in this embodiment cooperate with the central water injection section to serve as one injection and production unit, as shown in fig. 3, multiple injection and production units can be arranged between well seams of three target horizontal wells, and two adjacent injection and production units share the same oil recovery section to utilize the favorable displacement effect of interference between wells and seams, so that the number of effective well sections is increased, and the water injection utilization rate is improved. The fracturing cracks on two sides of the target horizontal well are symmetrically distributed in a symmetrical seam distribution mode, and the fracturing cracks on two sides of the horizontal well are distributed in a staggered mode, are distributed in a crossed mode like zipper teeth and are in a zipper seam distribution mode.
In the embodiment, the water injection huff and puff is converted into the multi-well-gap reverse seven-point-like method area water injection, so that invalid water injection can be avoided, the swept area is increased, the oil displacement efficiency is improved, and the yield of an oil production section is increased. By utilizing the uniform displacement of a target fracture network high flow guide channel and a multi-well inter-seam area water injection method, the improvement of the multi-well inter-seam area water injection efficiency and the residual oil utilization degree by a reverse seven-point method is realized, and the technical support is provided for the formulation of a subsequent inter-section encryption and adjustment scheme and a three-dimensional well network design scheme. The method for realizing multi-well inter-seam type reverse seven-point method area water injection in the embodiment can eliminate the influence of inter-seam interference, fully play the roles of linear water injection and radial displacement, enlarge the water injection swept range, increase the effective wells, improve the oil displacement efficiency and the single-well yield, and provide important technical guidance for low-permeability, ultra-low-permeability and compact reservoir area water injection development schemes and measures.
Further, according to the first embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method provided by the invention, a second embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method is provided, and in the embodiment of the invention, the expanding of the natural fractures and the communication of the fractured fractures to form the target fracture network comprises the following steps:
establishing a well group geological model, performing numerical simulation on a target horizontal well by using an oil deposit method according to the well group geological model based on model size parameters, reservoir parameters, fluid parameters and well parameters and by combining dynamic data and well testing data of the target horizontal well, fitting production history and obtaining a fracture propagation permeability simulation diagram;
and acquiring the target fracture network with stable natural fracture permeability and fracturing fracture permeability according to the change trends of the natural fracture permeability and the fracturing fracture permeability along with the water injection time in the fracture expansion permeability simulation diagram.
The embodiment specifically discloses that a well group geological model is established, a mode of fitting production history by a numerical simulation means is adopted based on size parameters, reservoir parameters, fluid parameters and well parameters of the well group geological model and combined with dynamic data, a target fracture network is formed by acquiring water injection induced natural fracture expansion, water injection wave and range is expanded by area water injection, and the effect of uniform displacement is fully exerted; both well group geological modeling and reservoir methods can be used in the prior art, as shown in FIG. 8, which specifically shows the specific parameters of the numerical simulation. Fitting the production history by using a numerical simulation method can obtain a fracture propagation permeability simulation chart shown in fig. 4 to 6. As shown in fig. 4, after 30 days of injection, the stress field intensity factor reaches fracture toughness, the pressure is increased to 41.7MPa, the originally closed natural fracture tip is excited and expanded, or the natural fracture with the filler is broken, a small amount of natural fracture is expanded, the injected water enters the natural fracture, and the permeability of the natural fracture is gradually increased; as shown in fig. 5, after 50 days of water injection, the natural micro-cracks expand to form new seepage spaces, the flow conductivity of the natural cracks is increased, and the natural cracks continue to expand and extend along with the increase of the pressure in the cracks; as shown in fig. 6, after the water injection is continued for 90 days, the permeability of the natural fractures and the permeability of the fractured fractures tend to be stable, and the natural fractures communicated with each other continue to extend to communicate the fractured fractures, so that a complex fracture network is formed. In the implementation, the most target fracture network can be accurately obtained by observing the change trend of the permeability along with the water injection time in the fracture expansion permeability simulation diagram in real time, and water injection is performed by adopting a multi-well interval reverse seven-point method based on the target fracture network.
According to the second embodiment of the multi-well interval water injection oil extraction method for the low-permeability tight reservoir horizontal well, provided by the invention, a third embodiment of the multi-well interval water injection oil extraction method for the low-permeability tight reservoir horizontal well is provided, and in the embodiment of the invention, the expanding of the natural fractures and the communication of the fractured fractures to form the target fracture network comprises the following steps:
according to the well group geological model, combining with dynamic monitoring data, carrying out numerical simulation on a target horizontal well by using an oil deposit method, fitting a production history, and obtaining a pressure change curve of the target horizontal well;
and determining the target fracture network according to the variation trend of the pressure variation curve along with the water injection time.
In one embodiment, the target fracture network can be accurately determined through the variation trend of pressure along with water injection time, three stages, namely a water injection initial stage, a water injection middle stage and a water injection later stage, can be accurately identified and distinguished according to the inflection point of a pressure variation curve, the crack expansion change is corresponded, and the final target fracture network can be accurately identified according to the inflection point of the water injection later stage.
According to the third embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method provided by the invention, the fourth embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method is provided, and in the embodiment of the invention, the pressure change curve comprises the following steps: a matrix pressure change curve, a natural fracture pressure change curve, and a fracture pressure change curve. In the embodiment, the target fracture network is obtained by specifically combining the change trends of the three pressure change curves and analyzing together, so that the accuracy of the water injection oil extraction method is improved.
According to a fourth embodiment of the multi-interval water injection oil extraction method for the low-permeability tight reservoir horizontal well, provided by the invention, a fifth embodiment of the multi-interval water injection oil extraction method for the low-permeability tight reservoir horizontal well is provided, and in the embodiment of the invention, the determining of the target fracture network according to the variation trend of the pressure variation curve along with the water injection time comprises the following steps:
and comparing the natural fracture pressure change curve, the matrix pressure change curve and the fracturing fracture pressure change curve to obtain the target fracture network with large pressure difference and consistent pressure change trend. In the embodiment, the variation trends of the three pressure variation curves along with the water injection time are specifically judged, and inflection points with consistent pressure variation trends are used as final water injection time for obtaining the target fracture network and water injection is stopped.
According to the fifth embodiment of the low-permeability tight reservoir horizontal well multi-well-interval water injection oil extraction method provided by the invention, the sixth embodiment of the low-permeability tight reservoir horizontal well multi-well-interval water injection oil extraction method is provided, in the embodiment of the invention, the step of comparing the natural fracture pressure change curve, the matrix pressure change curve and the fracture pressure change curve to obtain the target fracture network with large pressure difference and consistent pressure change trend comprises the following steps:
acquiring a first inflection point A of slowing down the increase of the matrix pressure in the matrix pressure change curve after water injection begins;
acquiring a second inflection point B of the decrease of the matrix pressure after the first inflection point;
acquiring a third inflection point C at which the matrix pressure slowly increases after the second inflection point B;
and determining the target fracture network according to the third inflection point C.
In this embodiment, the corresponding initial water injection period, middle water injection period and later water injection period are determined according to the first inflection point, the second inflection point and the third inflection point, and after the third inflection point is determined, three final inflection points F with large pressure difference and consistent pressure change trend of the pressure change curve are obtained by scanning to determine the target fracture network. As shown in fig. 7, after the first inflection point a appears 30 days after water injection, the pressure increase of the matrix pressure change curve is slowed down, the fillers of the natural cracks are washed away at the initial stage of water injection, a small amount of natural cracks are expanded, and the matrix pressure is reduced; after water is injected for 50 days, a second inflection point B appears on a matrix pressure curve, the matrix pressure is not obviously increased any more, the originally closed natural fracture is also excited and expanded, the natural fracture with the filler is flushed, the water absorption space is increased, and the matrix pressure is reduced; after 70 days of water injection, the inflection point C appears on the matrix pressure curve again, the final inflection point F appears on the natural fracture pressure curve, and the natural fracture pressure and the matrix pressure have the same variation trend; after the water injection is continued for 90 days, the pressure difference of the natural fracture, the matrix pressure and the pressure of the fracturing fracture is large, but the variation trends are consistent, which indicates that the natural fracture extends and communicates the fracturing fracture, and a high-flow-guide target fracture network is formed.
According to the sixth embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method provided by the invention, the seventh embodiment of the low-permeability tight reservoir horizontal well multi-well interval water injection oil extraction method is provided, and in the embodiment of the invention, the expanding of the natural fractures and the communication of the fractured fractures to form the target fracture network comprises the following steps:
and determining a target fracture network with stable natural fracture permeability and fracture permeability by combining the third inflection point. In the embodiment, the final target fracture network is determined by combining the permeability change trend and the third inflection point, so that the identification accuracy of the target fracture network can be further improved. And specifically, a target fracture network in which the permeability of the natural fracture and the permeability of the fractured fracture tend to be stable can be determined after the water injection time corresponding to the third inflection point.
According to the third embodiment of the multi-interval water injection oil extraction method for the low-permeability tight reservoir horizontal well, provided by the invention, an eighth embodiment of the multi-interval water injection oil extraction method for the low-permeability tight reservoir horizontal well is provided, and in the embodiment of the invention, the determining of the development fracture zone on the target horizontal well comprises the following steps:
and determining a high-conductivity dynamic fracture channel according to the fracture propagation permeability simulation diagram, and determining the development fracture zone according to the high-conductivity dynamic fracture channel. In the embodiment, the high-flow-guide dynamic fracture channel with high permeability can be determined according to the water injection time, and the high-flow-guide dynamic fracture channel is used as a development fracture zone, so that the development fracture zone can be accurately identified.
According to the eighth embodiment of the multi-well water injection and oil extraction method for the low-permeability tight reservoir horizontal well, provided by the invention, the ninth embodiment of the multi-well water injection and oil extraction method for the low-permeability tight reservoir horizontal well is provided, and in the embodiment of the invention, the determining the development fracture zone according to the dynamic fracture channel with high diversion comprises the following steps:
determining the developmental fracture band in combination with the highly conductive dynamic fracture channel and the pressure change curve. In the embodiment, the high-permeability fracture in the target fracture network is used as a high-flow-guiding dynamic fracture channel, and the developing fracture zone with large pressure difference is obtained according to the variation trend of the pressure variation curve along with the water injection time, so that the accuracy of identifying the developing fracture zone can be improved. In another embodiment, the natural fracture development zone is determined by performing a core electron microscopy scanning experiment; or obtaining permeability and pressure parameters through field well testing and engineering well logging methods, and determining the stratum with higher permeability and pressure as a fracture development zone.
The invention also provides a water injection oil extraction system between the multiple well seams of the horizontal well with the low-permeability tight oil reservoir, which comprises the following components:
the data simulation module is used for injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network;
and the data analysis module is used for judging whether the crack distribution mode of the fracturing cracks in the target crack network is a zipper type crack, if so, determining a development crack belt on the target horizontal well and determining the development crack belt as a central water injection section, determining the fracturing cracks of which two sides are adjacent and which form an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal centerline of the oil extraction regular hexagon.
In the embodiment, the water injection huff and puff is converted into the multi-well-gap reverse seven-point-like method area water injection, so that invalid water injection can be avoided, the swept area is increased, the oil displacement efficiency is improved, and the yield of an oil production section is increased. By utilizing the uniform displacement of a target fracture network high flow guide channel and a multi-well inter-seam area water injection method, the improvement of the multi-well inter-seam area water injection efficiency and the residual oil utilization degree by a reverse seven-point method is realized, and the technical support is provided for the formulation of a subsequent inter-section encryption and adjustment scheme and a three-dimensional well network design scheme. The method realizes the multi-well inter-joint reverse seven-point method area water injection, can eliminate the influence of inter-joint interference, fully exerts linear water injection and radial displacement, expands the water injection sweep range, increases the effective wells, improves the oil displacement efficiency and the single well yield, and provides important technical guidance for the low-permeability, ultra-low-permeability and compact reservoir area water injection development scheme and measures.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A water injection oil extraction method between multiple well seams of a horizontal well with a low-permeability tight reservoir is characterized by comprising the following steps:
injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network;
judging whether the crack distribution mode of the fracturing cracks in the target crack network is zipper type cracks or not;
and if the fracture is a zipper-type fracture, determining a development fracture zone on the target horizontal well, determining the development fracture zone as a central water injection section, determining the fracturing fracture which is adjacent on two sides of the development fracture zone and surrounds into an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal central line of the oil extraction regular hexagon.
2. The method for injecting water between multiple well fractures and extracting oil from a low-permeability tight reservoir horizontal well according to claim 1, wherein the expanding natural fractures and communicating the fractured fractures to form a target fracture network comprises:
establishing a well group geological model, performing numerical simulation on a target horizontal well by using an oil deposit method according to the well group geological model based on model size parameters, reservoir parameters, fluid parameters and well parameters and by combining dynamic data and well testing data of the target horizontal well, fitting production history and obtaining a fracture propagation permeability simulation diagram;
and acquiring the target fracture network with stable natural fracture permeability and fracturing fracture permeability according to the change trends of the natural fracture permeability and the fracturing fracture permeability along with the water injection time in the fracture expansion permeability simulation diagram.
3. The method for injecting water between multiple well fractures and extracting oil from a low-permeability tight reservoir horizontal well according to claim 2, wherein the expanding natural fractures and communicating the fractured fractures to form a target fracture network comprises:
according to the well group geological model, combining with dynamic monitoring data, carrying out numerical simulation on a target horizontal well by using an oil deposit method, fitting a production history, and obtaining a pressure change curve of the target horizontal well;
and determining the target fracture network according to the variation trend of the pressure variation curve along with the water injection time.
4. The method for injecting water into and extracting oil from the horizontal well and the multiple intervals of the low-permeability tight reservoir according to claim 3, wherein the pressure change curve comprises: a matrix pressure change curve, a natural fracture pressure change curve, and a fracture pressure change curve.
5. The method for extracting oil by injecting water between multiple well fractures of a low-permeability tight reservoir horizontal well according to claim 4, wherein the step of determining the target fracture network according to the variation trend of the pressure variation curve along with the water injection time comprises the following steps:
and comparing the natural fracture pressure change curve, the matrix pressure change curve and the fracturing fracture pressure change curve to obtain the target fracture network with large pressure difference and consistent pressure change trend.
6. The method for extracting oil through water injection among multiple well fractures of the horizontal well with low-permeability tight reservoir according to claim 5, wherein the step of comparing the natural fracture pressure change curve, the matrix pressure change curve and the fracturing fracture pressure change curve to obtain the target fracture network with large pressure difference and consistent pressure change trend comprises the following steps:
acquiring a first inflection point of matrix pressure increase slowing in the matrix pressure change curve after water injection begins;
acquiring a second inflection point of the decrease of the matrix pressure after the first inflection point;
acquiring a third inflection point of the slow increase of the matrix pressure after the second inflection point;
and determining the target fracture network according to the third inflection point.
7. The method for injecting water between multiple well fractures and extracting oil from a low-permeability tight reservoir horizontal well according to claim 6, wherein the expanding natural fractures and communicating the fractured fractures to form a target fracture network comprises:
and determining a target fracture network with stable natural fracture permeability and fracture permeability by combining the third inflection point.
8. The method for water injection oil recovery between multiple well gaps of a low-permeability tight reservoir horizontal well according to claim 3, wherein the determining the developed fracture zone on the target horizontal well comprises:
and determining a high-conductivity dynamic fracture channel according to the fracture propagation permeability simulation diagram, and determining the development fracture zone according to the high-conductivity dynamic fracture channel.
9. The method for water injection and oil extraction between multiple well fractures of a low-permeability tight reservoir horizontal well according to claim 8, wherein the determining the developed fracture zone according to the dynamic fracture channel with high diversion comprises:
determining the developmental fracture band in combination with the highly conductive dynamic fracture channel and the pressure change curve.
10. The utility model provides a water injection oil recovery system between tight oil reservoir horizontal well multiwell seam of hyposmosis which characterized in that includes:
the data simulation module is used for injecting water into the target horizontal well, expanding natural cracks and communicating the fractured cracks to form a target crack network;
and the data analysis module is used for judging whether the crack distribution mode of the fracturing cracks in the target crack network is a zipper type crack, if so, determining a development crack belt on the target horizontal well and determining the development crack belt as a central water injection section, determining the fracturing cracks of which two sides are adjacent and which form an oil extraction regular hexagon as an oil extraction section, and taking the central water injection section as a diagonal centerline of the oil extraction regular hexagon.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140048270A1 (en) * | 2012-08-20 | 2014-02-20 | Texas Tech University System | Methods and Devices for Hydraulic Fracturing Design and Optimization: A Modification to Zipper Frac |
| CN103953323A (en) * | 2014-05-08 | 2014-07-30 | 西南石油大学 | Hydraulic fracturing technology for horizontal well with fractures |
| CN104141481A (en) * | 2013-05-06 | 2014-11-12 | 中国石油天然气股份有限公司 | Horizontal well spacing method for ultra-low permeability tight reservoir |
| CN104832169A (en) * | 2015-05-30 | 2015-08-12 | 重庆地质矿产研究院 | Indoor experimental shaft device and method for horizontal well two-well synchronous or asynchronous multi-section clustering fracturing |
| CN105604534A (en) * | 2016-01-24 | 2016-05-25 | 廊坊开发区中油化油气技术服务有限公司 | Hydraulically affected fracturing process method for increasing production of coal-bed gas reservoir |
| CN105696997A (en) * | 2016-03-31 | 2016-06-22 | 中国石油大学(北京) | Method for achieving interval waterflood swallowing-spitting oil exploitation among multi-stage fracturing horizontal well fractures |
| CN106437642A (en) * | 2016-05-06 | 2017-02-22 | 中国石油天然气股份有限公司 | Injection-production asynchronous mining method for horizontal well of fractured reservoir |
| WO2017028322A1 (en) * | 2015-08-17 | 2017-02-23 | 中国石油大学(华东) | Horizontal well staged fracturing oil production method by injection and production in same well |
| CN106761611A (en) * | 2017-02-14 | 2017-05-31 | 中国石油大学(北京) | Double pressure break horizontal well cyclic water stimulation oil production methods of zip mode cloth seam |
| CN109209306A (en) * | 2018-09-12 | 2019-01-15 | 中国石油天然气股份有限公司 | Horizontal well CO injection for ultra-low permeability tight oil reservoir2Asynchronous throughput energy supplementing method |
| CN110259421A (en) * | 2019-05-23 | 2019-09-20 | 中国石油天然气股份有限公司 | Fractured compact oil reservoir water injection energy supplementing method |
| US20210148211A1 (en) * | 2017-07-10 | 2021-05-20 | Texas Tech University System | Methods and systems for ballooned hydraulic fractures and complex toe-to-heel flooding |
| US20210301622A1 (en) * | 2020-03-31 | 2021-09-30 | Xuebing Fu | Systems for Inter-Fracture Flooding of Wellbores and Methods of Using the Same |
| US20220145742A1 (en) * | 2019-07-20 | 2022-05-12 | Seismos, Inc. | Hydraulic fracturing, completion, and diverter optimization method for known well rock properties |
| CN114737943A (en) * | 2022-03-08 | 2022-07-12 | 中国石油大学(北京) | Unconventional reservoir three-dimensional well pattern transformation method, device, equipment and medium |
-
2022
- 2022-07-14 CN CN202210833137.XA patent/CN115324542B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140048270A1 (en) * | 2012-08-20 | 2014-02-20 | Texas Tech University System | Methods and Devices for Hydraulic Fracturing Design and Optimization: A Modification to Zipper Frac |
| CN104141481A (en) * | 2013-05-06 | 2014-11-12 | 中国石油天然气股份有限公司 | Horizontal well spacing method for ultra-low permeability tight reservoir |
| CN103953323A (en) * | 2014-05-08 | 2014-07-30 | 西南石油大学 | Hydraulic fracturing technology for horizontal well with fractures |
| CN104832169A (en) * | 2015-05-30 | 2015-08-12 | 重庆地质矿产研究院 | Indoor experimental shaft device and method for horizontal well two-well synchronous or asynchronous multi-section clustering fracturing |
| WO2017028322A1 (en) * | 2015-08-17 | 2017-02-23 | 中国石油大学(华东) | Horizontal well staged fracturing oil production method by injection and production in same well |
| CN105604534A (en) * | 2016-01-24 | 2016-05-25 | 廊坊开发区中油化油气技术服务有限公司 | Hydraulically affected fracturing process method for increasing production of coal-bed gas reservoir |
| CN105696997A (en) * | 2016-03-31 | 2016-06-22 | 中国石油大学(北京) | Method for achieving interval waterflood swallowing-spitting oil exploitation among multi-stage fracturing horizontal well fractures |
| CN106437642A (en) * | 2016-05-06 | 2017-02-22 | 中国石油天然气股份有限公司 | Injection-production asynchronous mining method for horizontal well of fractured reservoir |
| CN106761611A (en) * | 2017-02-14 | 2017-05-31 | 中国石油大学(北京) | Double pressure break horizontal well cyclic water stimulation oil production methods of zip mode cloth seam |
| US20210148211A1 (en) * | 2017-07-10 | 2021-05-20 | Texas Tech University System | Methods and systems for ballooned hydraulic fractures and complex toe-to-heel flooding |
| CN109209306A (en) * | 2018-09-12 | 2019-01-15 | 中国石油天然气股份有限公司 | Horizontal well CO injection for ultra-low permeability tight oil reservoir2Asynchronous throughput energy supplementing method |
| CN110259421A (en) * | 2019-05-23 | 2019-09-20 | 中国石油天然气股份有限公司 | Fractured compact oil reservoir water injection energy supplementing method |
| US20220145742A1 (en) * | 2019-07-20 | 2022-05-12 | Seismos, Inc. | Hydraulic fracturing, completion, and diverter optimization method for known well rock properties |
| US20210301622A1 (en) * | 2020-03-31 | 2021-09-30 | Xuebing Fu | Systems for Inter-Fracture Flooding of Wellbores and Methods of Using the Same |
| CN114737943A (en) * | 2022-03-08 | 2022-07-12 | 中国石油大学(北京) | Unconventional reservoir three-dimensional well pattern transformation method, device, equipment and medium |
Non-Patent Citations (2)
| Title |
|---|
| 于海洋;杨中林;马恬;雷征东;程时清;陈浩;: "致密油藏多级压裂井异井异步注采可行性研究", 石油科学通报, no. 01 * |
| 李芳玉;代力;吴德志;曾凤凰;程时清;: "多级压裂水平井分段测试压力分析方法", 石油钻采工艺, no. 01 * |
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