CN108979610A - Horizontal well seam liquid flow steering water control and water plugging development method, device and system - Google Patents
Horizontal well seam liquid flow steering water control and water plugging development method, device and system Download PDFInfo
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- CN108979610A CN108979610A CN201810888601.9A CN201810888601A CN108979610A CN 108979610 A CN108979610 A CN 108979610A CN 201810888601 A CN201810888601 A CN 201810888601A CN 108979610 A CN108979610 A CN 108979610A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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Abstract
The invention provides a development method, a device and a system for steering, controlling and blocking water of liquid flow in horizontal well seams, wherein the method comprises the following steps: blocking the water outlet crack to isolate the water outlet crack from being communicated with the horizontal shaft, wherein the water outlet crack is communicated with the water injection well; performing a fracturing process on the oil reservoir on at least one side of the water outlet fracture, thereby forming a newly created fracture on at least one side of the water outlet fracture, wherein the newly created fracture is communicated with the horizontal shaft; water is injected into the water outlet fractures through the water injection well, and the injected water flows through the matrix pores of the oil reservoir to the newly created fractures, thereby displacing the crude oil in the matrix pores to flow into the newly created fractures and ultimately into the horizontal wellbore. The invention can better improve the water control and water plugging effect of the fractured water breakthrough of the horizontal well and improve the utilization degree of the water drive reserve of the fractured water breakthrough horizontal well.
Description
Technical Field
The invention relates to the technical field of water control and water shutoff, in particular to a development method, a device and a system for steering flow in horizontal well seams to control water and water.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Staged fracturing and water injection energy supplement are a technical strategy for developing a horizontal well with low permeability and compact oil reservoir. Because the permeability of an oil layer is smaller than that of a crack, the problem of ineffective displacement caused by the fact that injected water is communicated with the crack and then directly flows into a shaft along the crack often exists in the development process. Thus, the water drive control degree and the water drive efficiency are greatly reduced, and the oil well shows rapid flooding and thus loses productivity. The above is the crack water breakthrough of the oil well, and water control and water plugging are needed to recover the productivity.
Compared with a vertical well, the water control and water shutoff of the horizontal well is more difficult, the technology mainly focuses on the aspects of non-fractured horizontal well of a middle-high permeability reservoir and coning shutoff of a bottom water reservoir (ridge entry), and the adopted main processes comprise a chemical water shutoff method, a mechanical water shutoff method, a double horizontal well barrel method and the like. However, for how to recover the productivity of the horizontal well which is developed by water injection and fractured to improve fractured water breakthrough, the above methods are still adopted at present, but the good effect cannot be obtained.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
The reason that the problem of water breakthrough of the oil well due to the fact that cracks easily occur in the oil well in the development mode of 'staged fracturing + water injection energy supplement' in the prior art is that the permeability of an oil layer is low, and water injected into the cracks (usually artificial cracks formed by artificial fracturing) through a water injection well can selectively flow in the direction with high permeability and low flow resistance. Because the artificial fractures are generally formed by perforating and hydraulic fracturing in the horizontal wellbore, the artificial fractures are in direct communication with the horizontal wellbore. So that the injection water flows directly into the horizontal wellbore through the artificial fracture.
That is, the essential reason for the occurrence of water breakthrough in fractures is that the injected water cannot enter the oil reservoir laterally and displace the crude oil in the reservoir. The injected water can not displace the crude oil, and the crude oil development is not mentioned.
However, in the prior art, the known embodiments such as the chemical water plugging method, the mechanical water plugging method and the double horizontal well bore method can only achieve the purpose of controlling and plugging water, but cannot solve the final problem that the injected water flows transversely in an oil layer to displace crude oil to recover the productivity.
Based on the defects of the prior art, the embodiment of the invention provides a development method, a device and a system for steering, controlling and blocking water of liquid flow in a horizontal well fracture, which can better improve the water control and blocking effect of the fracture water breakthrough of the horizontal well and improve the utilization degree of the water drive reserve of the fracture water breakthrough horizontal well.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a new fracturing method for a new fracture. Then, water injected into the water outlet crack through the water injection well can only transversely enter the oil layer, so that crude oil in the oil layer is displaced to enter a newly-built crack and finally enter the horizontal shaft, and oil extraction is realized.
In order to achieve the above object, the present invention provides the following technical solutions.
A horizontal well seam liquid flow steering water control and water plugging development method comprises the following steps: blocking a water outlet crack to isolate the water outlet crack from being communicated with a horizontal well shaft, wherein the water outlet crack is communicated with a water injection well; performing a fracturing process on the reservoir on at least one side of the water out fracture, thereby forming a newly created fracture on at least one side of the water out fracture, the newly created fracture being in communication with the horizontal wellbore; injecting water into the water outlet fracture through the water injection well, the injected water flowing through the matrix pores of the oil formation toward the newly created fracture, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and ultimately into the horizontal wellbore.
A horizontal well seam liquid flow steering water control water plugging and oil extraction device comprises: the plugging module is used for plugging a water outlet crack to isolate the water outlet crack from being communicated with the horizontal shaft, and the water outlet crack is communicated with the water injection well; a fracturing module for performing a fracturing process on an oil reservoir on at least one side of the water outlet fracture, thereby forming a newly created fracture on at least one side of the water outlet fracture, the newly created fracture being in communication with the horizontal wellbore; and a water injection module for injecting water into the water outlet fracture through the water injection well, wherein the injected water flows to the newly created fracture through the matrix pores of the oil reservoir, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and finally into the horizontal wellbore.
A horizontal well in-seam liquid flow steering water control water plugging and oil production system is provided, wherein the horizontal well is provided with a horizontal well shaft extending into an oil layer, a water outlet seam is formed in the oil layer, and a newly-made seam positioned on at least one side of the water outlet seam; wherein the water outlet fracture is plugged so that it is isolated from the horizontal wellbore, and the water outlet fracture is in communication with a water injection well, the newly created fracture being in communication with the horizontal wellbore; when water is injected into the water outlet fracture through the water injection well, the injected water can flow through the matrix pores of the oil formation toward the newly created fracture, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and ultimately into the horizontal wellbore.
The invention forms new cracks by blocking the water outlet cracks and re-fracturing two sides of the water outlet cracks. The water injected into the water outlet crack through the water injection well is forced to flow towards the newly-created crack on at least one side due to the isolation between the water outlet crack and the horizontal shaft, so that the crude oil in the pores of the displacement matrix flows into the horizontal shaft through the newly-created crack, a new displacement system is established, the invalid circulation of the injected water of the water injection well is avoided, the water control and water plugging effect of the fractured water of the horizontal shaft is improved, the effective utilization of the reserves on two sides of the water outlet crack can be realized, and the productivity of the oil well is recovered.
Therefore, the invention blocks the water outlet cracks to prevent the injected water from entering the horizontal shaft along the water outlet cracks, at least one side of the water outlet cracks is fractured again to form new cracks, the injected water in the water outlet cracks flows to the horizontal shaft along the water outlet cracks and then flows to the new cracks through the matrix pores, the crude oil in the matrix pores is displaced to flow into the new cracks, and then the crude oil flows into the horizontal shaft through the new cracks, thereby improving the water drive reserve utilization degree of the fractured water-breakthrough horizontal well.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
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, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:
FIG. 1 is a schematic structural diagram of a horizontal well fracture internal liquid flow steering water control and water plugging and oil production system according to an embodiment of the invention;
FIG. 2 is a flow chart of a development method for diverting flow in horizontal well seams to control water and block water according to an embodiment of the invention;
FIG. 3 is a block diagram of the horizontal well gap fluid diversion water control water shutoff and oil extraction device according to the embodiment of the invention;
fig. 4 is a schematic diagram illustrating the injection and production principle of a double-layer concentric oil pipe according to a known embodiment of the prior art.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection 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 "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention fractures in the oil reservoir 300 to form at least two adjacent fractures, including the water outlet fracture 100, and a newly created fracture 400 formed by fracturing again later is positioned on at least one side of the water outlet fracture 100. The water exit fracture 100 is in communication with a water injection well 600, which will subsequently act as a water injection fracture. Since the water outlet fracture 100 is plugged, the injection water can no longer pass directly into the horizontal wellbore 200 and can only flow laterally toward the newly created fracture 400.
In fact, the prior art presents known embodiments for solving the problem of displacing the crude oil by providing three fractures, injecting water into the middle fracture and flowing it into the fractures on both sides. Specifically, the publication number CN105114048B provides 'a horizontal well staged fracturing same well injection and production oil production method'.
As shown in fig. 4, the known embodiment includes three fractures, a target injection fracture 10 in the middle, a production fracture 9 and a production fracture 11 on both sides of the target injection fracture 10. The double concentric tubing installed in the casing 2 comprises an outer tube 3 and an inner tube 4 sleeved in the outer tube 3, and packers 15 and 16 are connected outside the casing 2 to separate a target injection fracture 10 and a production fracture 9 from a production fracture 11. An injection liquid channel communicated with a target injection crack 10 is formed between the inner pipe 4 and the outer pipe 3, a produced liquid channel I communicated with a production crack 11 is formed between the outer pipe 3 and the sleeve 2, and a produced liquid channel II communicated with a production crack 9 is formed in the inner pipe 4.
And injecting an oil displacement agent into the target injection crack 10 through the injection liquid channel, wherein the oil displacement agent then flows transversely, and the displacement crude oil flows into the produced liquid channels I and II through the produced cracks 9 and 11, so that oil extraction is realized.
However, this known embodiment requires the placement of two concentric tubing layers in the wellbore, the use of packers to interval separate the fractures, and the establishment of communication between three fractures and three passageways. Therefore, the structure and the process of the known embodiment are complex to implement, and even there may be a problem of implementation failure due to inaccurate correspondence between the three cracks and the three channels.
In view of the above, the invention provides a development method, a device and a system for steering, controlling and blocking water of liquid flow in horizontal well seams. As shown in fig. 1, the horizontal well has a horizontal wellbore 200 extending into an oil reservoir 300, a water-producing fracture 100 formed in the oil reservoir 300, and a newly created fracture 400 located on at least one side of the water-producing fracture 100. Wherein the water outlet fracture 100 is plugged such that it is isolated from the horizontal wellbore 200, and the water outlet fracture 100 is in communication with the water injection well 600 and the newly created fracture 400 is in communication with the horizontal wellbore 200.
When the water fracture 100 is injected through the water injection well 600, the injected water can flow toward the newly created fracture 400 through the matrix pores of the oil reservoir 300, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture 400 and finally into the horizontal wellbore 200.
In the present embodiment, at least one side of the water outlet crack 100 is formed with a newly created crack 400. The injected water will flow laterally due to the water outlet cracks 100 being plugged, and such lateral flow is likely to occur on both sides of the water outlet cracks 100. Therefore, as a preference, newly-made cracks 400 are formed on both sides of the water outlet crack 100, so that the utilization rate of the injected water can be improved to the maximum limit, the displacement efficiency is further improved, and the displacement dead angle is avoided.
In addition, after the injected water passes through a newly created crack 400, the pressure drops and the pressure for continuing the lateral diffusion flow is insufficient. Therefore, it is preferable to form a new crack 400 on each of both sides of the outgoing water crack 100. Namely, there are two newly-created cracks 400, and the two newly-created cracks 400 are respectively located at two sides of the water outlet crack 100. Therefore, the cost of fracturing and crack forming is considered on the premise of ensuring the displacement effect.
The orientation of the water fracture 100 and the newly created fracture 400 is not limited to being perpendicular to the horizontal wellbore 200. In fact, as long as the water outlet fracture 100 is sealed off from communication with the horizontal wellbore 200, the newly created fracture 400 is in communication with the horizontal wellbore 200.
Further, the water egress fractures 100 may be plugged using any suitable existing technique or configuration. Preferably, the plugging can be realized by squeezing a cement slug 500 into a gap communicated with the horizontal shaft 200, so that the implementation is simple, and the water injection length of the water fracture 100 can be extended as far as possible, thereby increasing the displacement area of the injected water contacted with the oil layer 300 and improving the displacement efficiency.
As shown in fig. 2, a flow chart of a method for forming a flow diversion water control and water plugging and oil production system in a horizontal well gap is shown. Although the present invention provides method steps as described in the following embodiments or flowcharts, more or fewer steps may be included in the method, with or without the assistance of inventive faculty. Moreover, the method logically lacks the necessary causal steps, and the order of execution of these steps is not limited to the order of execution provided in the embodiments of the present invention.
With reference to fig. 1 and 2, an embodiment of the present invention provides a horizontal well gap fluid diversion water control and water plugging development method, which may include the following steps:
step S40: plugging the water outlet crack 100 to isolate the communication with the horizontal wellbore 200, the water outlet crack 100 being in communication with the water injection well 600;
step S50: performing a fracturing process on the oil layer 300 at least one side of the water outlet fracture 100, thereby forming a newly created fracture 400 at least one side of the water outlet fracture 100, the newly created fracture 400 being communicated with the horizontal wellbore 200;
step S60: water is injected into the produced fracture 100 through the water injection well 600 and the injected water flows toward the newly created fracture 400 through the matrix pores of the oil reservoir 300, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture 400 and finally into the horizontal wellbore 200.
The development method for controlling water and blocking water by diverting the liquid flow in the horizontal well gap is suitable for the situation that the horizontal well shaft 200 is exposed to water or flooded by injected water. Wherein the injected water is injected from the water injection well 600 into the previously fractured artificial fracture. Typically, the pre-fractured artificial fractures are multiple and are all in communication with the horizontal wellbore 200, and the water outlet fracture 100 is one of the multiple artificial fractures.
As described above, the newly created fractures 400 are at least one, and preferably two, and are located on either side of the outgoing fracture 100. The embodiment is to perform a fracturing process on the oil layer 300 on both sides of the water fracture 100, so that new fractures 400 are formed on both sides of the water fracture 100, and the number of the new fractures 400 on one side of the water fracture 100 is one.
Before the step of plugging the produced water fracture 100, the embodiment of the invention further comprises a step of judging fracture water breakthrough, namely judging whether the water breakthrough or flooding of the horizontal shaft 200 is caused by the fracture water breakthrough.
Specifically, as shown in fig. 2, before the step of plugging the water fracture 100, the method further includes:
step S10: judging whether the water breakthrough type of the horizontal shaft 200 is fractured water breakthrough or not;
step S20: if so, determining the water outlet position of the horizontal shaft 200, wherein the crack corresponding to the water outlet position is the water outlet crack 100;
step S30: identifying whether the water source of the water fracture 100 is a water injection well 600; if so, an operation of plugging the water outlet crack 100 is performed.
In the embodiment, whether the water breakthrough type of the horizontal shaft 200 is fractured water breakthrough or not can be judged through the production dynamic characteristics of the oil well; the water outlet position can be determined by a mechanical water finding method, an engineering logging method or a production logging method and the like; whether the source of the incoming water is a water injection well 600 can be identified by methods such as interference well testing, tracing monitoring or water flooding front testing. All the above can be realized by the prior art, and are not described in detail herein.
In addition, after step S10, the reasons for water content rise and flooding in the horizontal well bore 200 can be analyzed, and the water type analysis can determine that the water injection rushes into the well and causes the flooding of the well to lose the productivity. Thus, the fact that the oil well loses productivity due to flooding is determined, and the oil well water breakthrough is further verified to be fractured water breakthrough caused by water injection through the water injection well 600.
Following the above description, the water outlet fracture 100 forms one of a plurality of artificial fractures when the "staged fracturing + energy replenishment by water injection" is performed. When it is determined that the water breakthrough or flooding of the horizontal wellbore 200 is caused by a fracture water breakthrough, the fracture that produces water, i.e., the water production fracture 100, needs to be found from the plurality of artificial fractures. Subsequently, after determining that the water source is the water injection well 600, the plugging operation can be performed on the water outlet crack 100.
If one of the two determinations is negative, it is determined that the oil well water breakthrough is not due to a fracture water breakthrough from the water injection well 600. At this time, the technical scheme of the invention is not needed to be implemented, the reason of water outlet needs to be further determined, and corresponding remedial measures need to be taken.
The specific way of blocking the water outlet crack 100 is to inject cement into the water outlet crack 100 near the well zone to form a slug 500, the length of which is 2 to 3 meters, and block the crack of the water outlet crack 100 communicated with the horizontal shaft 200, thereby realizing the isolation of the communication relationship between the water outlet crack 100 and the horizontal shaft 200.
Furthermore, the location of the newly created fracture 400 should be on the principle of being able to establish an effective and efficient displacement. The specific determination principle is that the position of a newly-created fracture is determined according to the permeability of the oil layer 300 and the pressure in the fracture of the water outlet fracture 100; fracturing and fracture-making are performed at the determined location of the newly-made fracture to form the newly-made fracture 400.
Specifically, the better the permeability of the oil layer 300, the higher the pressure within the water-out fracture 100, the greater the newly created fracture location, i.e., the distance between the newly created fracture 400 and the water-out fracture 100.
After the above operations are completed, oil recovery operations can be performed. Specifically, a production string is lowered into the horizontal well, and the crude oil in the horizontal well bore 200 is lifted to the surface via the production string. The specific lifting method may be any suitable conventional technique, and the present invention is not limited thereto.
Based on the same concept, the embodiment of the invention also provides a device for steering, controlling and blocking water and oil production of liquid flow in the horizontal well cracks, and the following implementation mode is provided. Because the principle of the horizontal well fracture liquid flow steering water control water shutoff and oil extraction device and the technical effect which can be obtained are similar to the horizontal well fracture liquid flow steering water control water shutoff development method, the implementation of the horizontal well fracture liquid flow steering water control water shutoff and oil extraction device can refer to the implementation of the horizontal well fracture liquid flow steering water control water shutoff development method, and repeated parts are not repeated. The term "module" used below may be implemented based on software, or based on hardware, or implemented by a combination of software and hardware.
As shown in fig. 3, the device for diverting flow in horizontal well joints, controlling water and blocking water and extracting oil according to the embodiment of the invention may include: a plugging module 40, a fracturing module 50, and a waterflooding module 60. Wherein,
the plugging module 40 is used for plugging the water outlet crack 100 to isolate the communication between the water outlet crack 100 and the horizontal shaft 200, and the water outlet crack 100 is communicated with the water injection well 600;
the fracturing module 50 is used for performing a fracturing process on the oil layer 300 on at least one side of the water outlet fracture 100, so as to form a newly-made fracture 400 communicated with the horizontal shaft 200 on at least one side of the water outlet fracture 100;
the water injection module 60 is used to inject water into the water out fracture 100 through the water injection well 600, and the injected water flows toward the newly created fracture 400 through the matrix pores of the oil formation 300, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture 400 and finally into the horizontal wellbore 200.
Further, the horizontal well bore liquid flow steering water control and water plugging and oil extraction device in the embodiment of the invention may further comprise a fracture water breakthrough judgment module, namely, a module for judging whether water breakthrough or flooding of the horizontal well bore 200 is caused by fracture water breakthrough or not.
Specifically, it includes:
the judging module 10 is used for judging whether the water breakthrough type of the horizontal shaft 200 is fractured water breakthrough or not;
the determining module 20 is configured to determine a water outlet position of the horizontal shaft 200, where a fracture corresponding to the water outlet position is the water outlet fracture 100;
and the identification module 30 is used for identifying whether the water source of the water fracture 100 is the water injection well 600.
According to the development method, the device and the system for controlling water and blocking water by diverting the liquid flow in the horizontal well cracks, the water outlet cracks 100 are blocked, and the newly-made cracks 400 are formed by re-fracturing at two sides of the water outlet cracks 100. The water injected into the water outlet crack 100 through the water injection well 600 is forced to flow towards at least one newly-created crack 400 on one side because the water outlet crack 100 is isolated from the horizontal shaft 200, so that the crude oil in the pores of the displacement matrix flows into the horizontal shaft 200 through the newly-created crack 400, a new displacement system is established, the ineffective circulation of the water injected into the water injection well 600 is avoided, the water control and water plugging effects of the fractured water breakthrough of the horizontal shaft are improved, the effective utilization of the reserves on two sides of the water outlet crack 100 can be realized, and the productivity of the oil well is recovered.
Therefore, the invention blocks the water outlet crack 100 to prevent the injected water from entering the horizontal shaft 200 along the water outlet crack 100, and at least one side of the water outlet crack 100 is fractured again to form a new crack 400, the injected water in the water outlet crack 100 flows towards the horizontal shaft 200 along the water outlet crack 100 and then flows towards the new crack 400 through the matrix pores, and the crude oil in the matrix pores is displaced to flow into the new crack 400 and then flows into the horizontal shaft 200 through the new crack 400, so that the water displacement utilization degree of the fractured water-visible horizontal well is improved.
In addition, according to the development method, the device and the system for controlling water and blocking water by diverting the liquid flow in the horizontal well cracks, only the position of the water outlet crack 100 needs to be found and determined, and the newly-created crack 400 is formed by re-fracturing at least one side of the water outlet crack, and other structures still keep the original functions of the water outlet crack to be continuously exerted (for example, the water injection well 600 still normally executes the original water injection operation, and the horizontal well shaft 200 still normally executes the original oil pumping and oil extraction operation), and other further reconstruction of the original structures is not needed. Compared with the above mentioned known embodiments, the structure of the horizontal well gap flow diversion water control and water plugging system of the embodiment of the invention is simplified, and the corresponding implementation method is also very simple.
The development method, the device and the system for steering the liquid flow in the horizontal well seam to control the water and block the water have better implementation effect in practical application. Specifically, the embodiment well is a 1-hole horizontal well, the length of a horizontal well cylinder is 1000 meters, and the single well control storage capacity is 30 ten thousand tons. And (3) fracturing modification, wherein a 5-point method (or a 6-point method) water injection and water drive development is adopted, 4 (or 6) water injection wells are arranged around the fracturing modification, and the fracturing modification is carried out at the initial production stage with low water content and high oil content (more than 10 tons). After a period of production, the water content suddenly rises and even the water is flooded, the liquid production amount greatly rises, the working fluid level quickly rises to a wellhead, the wellhead pressure is even close to the water injection pressure of surrounding wells, the oil amount drops to 0, the accumulated oil production amount is thousands of tons, the production capacity is lost, the recovery ratio is less than 1 percent and is far lower than the recovery ratio which is more than 25 percent planned by a development scheme, and the loss of the yield and the reserve is serious.
The invention is applied to flow steering, water control and water shutoff in the horizontal well seam, changes the water drive direction, avoids ineffective circulation of injected water, recovers the productivity of the horizontal well, and improves the water drive reserve utilization degree and the water drive reserve utilization efficiency.
The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the disclosure of the invention document without departing from the spirit and scope of the present invention.
Claims (10)
1. A horizontal well seam liquid flow steering water control and water plugging development method is characterized by comprising the following steps:
blocking a water outlet crack to isolate the water outlet crack from being communicated with a horizontal well shaft, wherein the water outlet crack is communicated with a water injection well;
performing a fracturing process on the reservoir on at least one side of the water out fracture, thereby forming a newly created fracture on at least one side of the water out fracture, the newly created fracture being in communication with the horizontal wellbore;
injecting water into the water outlet fracture through the water injection well, the injected water flowing through the matrix pores of the oil formation toward the newly created fracture, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and ultimately into the horizontal wellbore.
2. The method of claim 1, wherein prior to the step of plugging the water fracture, the method further comprises:
judging whether the water breakthrough type of the horizontal shaft is fractured water breakthrough or not;
if so, determining the water outlet position of the horizontal shaft, wherein the crack corresponding to the water outlet position is the water outlet crack;
identifying whether an incoming water source of the water outlet fracture is a water injection well; if yes, the operation of plugging the water outlet crack is carried out.
3. The method of claim 1, wherein in the step of performing a fracturing process on the reservoir on at least one side of the water fracture,
and performing a fracturing process on oil layers on two sides of the water outlet crack, so that newly-made cracks are formed on two sides of the water outlet crack, and the number of the newly-made cracks on one side of the water outlet crack is one.
4. The method of claim 1, wherein the water production fractures are plugged by injecting a slug into the water production fractures in the near wellbore zone, the slug plugging the fracture openings of the water production fractures communicating with the horizontal wellbore.
5. The method of claim 4, wherein the slug is a cement slug having a length of 2 to 3 meters.
6. The method of claim 1, wherein the step of forming a newly created fracture comprises:
determining the position of a newly-built crack according to the permeability of the oil layer and the pressure in the crack of the water outlet crack;
and fracturing at the determined position of the new fracture to form the new fracture.
7. The method of claim 1, wherein after the step of injecting water into the water production fracture through the water injection well, the method further comprises: and (3) lowering a production string into the horizontal well, and lifting the crude oil in the horizontal well to the ground through the production string.
8. The utility model provides a horizontal well seam liquid stream turns to accuse water shutoff water and oil recovery device which characterized in that includes:
the plugging module is used for plugging a water outlet crack to isolate the water outlet crack from being communicated with the horizontal shaft, and the water outlet crack is communicated with the water injection well;
a fracturing module for performing a fracturing process on an oil reservoir on at least one side of the water outlet fracture, thereby forming a newly created fracture on at least one side of the water outlet fracture, the newly created fracture being in communication with the horizontal wellbore;
and a water injection module for injecting water into the water outlet fracture through the water injection well, wherein the injected water flows to the newly created fracture through the matrix pores of the oil reservoir, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and finally into the horizontal wellbore.
9. The apparatus of claim 8, further comprising:
the judging module is used for judging whether the water breakthrough type of the horizontal shaft is fractured water breakthrough or not;
the determining module is used for determining the water outlet position of the horizontal shaft, and the crack corresponding to the water outlet position is the water outlet crack;
and the identification module is used for identifying whether the water source of the water outlet crack is a water injection well.
10. A horizontal well in-seam liquid flow steering water control water plugging and oil production system is provided, wherein the horizontal well is provided with a horizontal shaft extending into an oil layer, and is characterized in that a water outlet crack and a newly-made crack positioned on at least one side of the water outlet crack are formed in the oil layer; wherein the water outlet fracture is plugged so that it is isolated from the horizontal wellbore, and the water outlet fracture is in communication with a water injection well, the newly created fracture being in communication with the horizontal wellbore;
when water is injected into the water outlet fracture through the water injection well, the injected water can flow through the matrix pores of the oil formation toward the newly created fracture, thereby displacing the crude oil in the matrix pores to flow into the newly created fracture and ultimately into the horizontal wellbore.
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