CN114482947A - High-pressure water injection technology implementation method and system for fractured-vuggy carbonate reservoir - Google Patents
High-pressure water injection technology implementation method and system for fractured-vuggy carbonate reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 472
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Abstract
The invention discloses a method for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir, which comprises the following steps: analyzing the well-reservoir relationship of the current reservoir area, and/or the comparison result of the static reserve and the used reserve, and/or the state of the current used channel according to the static seismic data of the reservoir area to be constructed; determining a water injection mode suitable for the current oil reservoir region according to the region analysis result, and obtaining construction parameters including total water injection amount and/or water injection displacement according to a construction principle corresponding to the water injection mode, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom water level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel; and (4) performing high-pressure water injection operation on the current oil reservoir region by using the construction parameters according to a water injection mode. The invention can realize the capacity increase of a low-yield energy well or a water injection failure well, meet the sustainable water injection development requirement and improve the recovery efficiency.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a method and a system for realizing a high-pressure water injection technology for a carbonate fracture-cavity type oil reservoir.
Background
The development of the fractured-vuggy carbonate reservoir is characterized by high productivity at the initial stage of production, fast decrement of yield and energy at the middle and later stages and need of water injection to supplement the reservoir energy. The water injection in the initial stage of the fracture-cavity type oil reservoir water injection depends on experience to meet the development requirement of rapid production, but basic oil reservoir parameters such as porosity and permeability of the fracture-cavity type oil reservoir are difficult to determine, so that the theory of how to inject water is always in a difficult exploration period. After long-term practice and theoretical research, the problem of quantitative water injection of the dissolved-fluid reservoir is solved in 2015, large-scale water injection development is realized, and high-quality scientific development is met. However, with the long-term water flooding development of the solution-fractured oil reservoir, the water flooding effect is degraded in 2017.
Because the conventional water injection for the fracture-cavity oil reservoir is limited by factors such as total injection amount, water injection pressure, water injection displacement and the like, the conventional water injection for the fracture-cavity oil reservoir can preferentially enter an advantageous displacement range in the water injection process and cannot affect the whole oil reservoir, so that the water injection period of validity is short, the low injection-production ratio and the low injection-storage ratio fail, and the effect of improving the recovery ratio amplitude is limited. Therefore, in the prior art, a water injection technology for efficiently treating an oil reservoir area is urgently needed to be found, and the water injection recovery rate is further improved.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir, which comprises the following steps: analyzing the well-reservoir relationship of the current reservoir area, and/or the comparison result of the static reserve and the used reserve, and/or the state of the current used channel according to the static seismic data of the reservoir area to be constructed to obtain the corresponding area analysis result; determining a water injection mode suitable for the current oil reservoir area according to the area analysis result, and obtaining construction parameters including total water injection amount and/or water injection displacement according to a construction principle corresponding to the water injection mode, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel; and performing high-pressure water injection operation on the current oil reservoir region according to the water injection mode by using the construction parameters.
Preferably, in the step of determining a water injection mode adapted to the current reservoir region according to the region analysis result, the method includes: and when the production well acted by the current construction is positioned in the middle position of the un-communicated effective reservoir body in the current oil reservoir area and the oil utilization reserve is lower than the static reserve, implementing the bottom water simulating high-pressure water injection technology on the current oil reservoir area so as to increase the swept range of the oil reservoir area.
Preferably, when determining that the bottom water simulating high-pressure water injection technology is adopted to carry out water injection construction on the current oil reservoir region, the construction parameters are designed according to the following steps: determining a first total water injection amount corresponding to the current water injection mode, and determining a corresponding first water injection displacement according to the water injection duration, wherein the first total water injection amount is the product of the unit pressure drop liquid production amount and the pressure difference for use when the current oil reservoir region acts; and determining a first water injection pressure corresponding to the current water injection mode, wherein the first water injection pressure is the sum of the average pressure and the differential pressure of the oil reservoir region when the current oil reservoir region acts.
Preferably, when the construction parameters are utilized to carry out bottom water simulating high-pressure water injection construction on the current oil reservoir region, the method comprises the following steps: monitoring the real-time displacement of a wellhead of a current production well, and ensuring that the real-time displacement is kept at the first water injection displacement; and monitoring the bottom hole flowing pressure of the production well in real time, and ensuring that the real-time bottom hole flowing pressure is greater than the first water injection pressure.
Preferably, in determining the water injection mode adapted to the current oil reservoir region according to the region analysis result, the method further includes: and when the production well acted by the current construction is positioned at the edge position of the reservoir body which is not communicated with the effective reservoir body in the oil reservoir area and the current oil reservoir area is in a damaged or non-established state, implementing the simulated fracturing high-pressure water injection technology on the current oil reservoir area so as to establish a flow channel.
Preferably, when determining that the fracturing-simulating high-pressure water injection technology is adopted to carry out water injection construction on the current oil reservoir region, the construction parameters are designed according to the following steps: determining a second water injection displacement corresponding to the current water injection mode; and determining a second water injection pressure corresponding to the current water injection mode, wherein the second water injection pressure is the stratum fracture pressure when the current oil reservoir region acts.
Preferably, when the construction parameters are utilized to perform the fracture-simulating high-pressure water injection construction on the current oil reservoir region, the method comprises the following steps: monitoring the bottom hole flowing pressure of the production well in real time to ensure that the real-time bottom hole flowing pressure is greater than or approximate to the second water injection pressure; and performing water injection construction operation according to the second water injection displacement, recording the real-time water injection amount of the wellhead of the production well, monitoring the real-time oil pressure and the real-time casing pressure of the wellhead of the production well, synchronously drawing a water injection indication curve matched with the current water injection construction state based on the real-time oil pressure and the real-time casing pressure, and stopping the current water injection construction when reaching a second slow-down section after a descending section or an inflection point of the water injection indication curve.
In addition, the invention also provides a high-pressure water injection technology implementation system for the fractured-vuggy carbonate reservoir, which comprises the following steps: the oil reservoir area analysis module is configured to analyze the well-reservoir relationship of the current oil reservoir area, and/or the comparison result of the static reserve and the oil-using reserve, and/or the state of the current oil-using channel according to the static seismic data of the oil reservoir area to be constructed, so as to obtain the corresponding area analysis result; a water injection parameter design module configured to determine a water injection mode adapted to the current oil reservoir region according to the region analysis result, and obtain construction parameters including total water injection amount and/or water injection displacement according to a construction principle corresponding to the water injection mode, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel; and the water injection construction module is configured to implement high-pressure water injection operation on the current oil reservoir region according to the water injection mode by utilizing the construction parameters.
Preferably, the water injection parameter design module includes: and the construction mode generating unit is configured to implement the bottom water simulating high-pressure water injection technology on the current oil reservoir area to enlarge the sweep range of the oil reservoir area when the production well acted by the current construction is positioned at the middle position of the un-communicated effective reservoir body in the current oil reservoir area and the utilization reserve is lower than the static reserve.
Preferably, the water injection parameter design module includes: and the construction mode generating unit is configured to implement the simulated fracturing high-pressure water injection technology on the current oil reservoir area to establish a flow channel when a production well acted by current construction is positioned at the edge position of an unconnected effective reservoir body in the oil reservoir area and the current flow channel is damaged or in an unconnected state.
Compared with the prior art, one or more embodiments in the scheme can have the following advantages or beneficial effects:
the invention provides a method and a system for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir. The method and the system provide a high-pressure water injection technology which is suitable for different types of well-storage relation combination, and/or the distribution form of each reservoir body in an oil reservoir area, and/or the distribution condition of each reservoir body in the oil reservoir area, and/or the internal structure of each reservoir body in the oil reservoir area through the deep research on the oil-displacing mechanism by water injection, the water-flooding mechanism and the development phenomenon, and the high-pressure water injection technology comprises the following steps: the simulated bottom water high-pressure water injection technology is used for simulating the bottom water control technology of the partition plate to expand the spread range in a low-cost water injection mode, and the simulated fracturing high-pressure water injection technology is used for simulating the hydraulic fracturing technology to establish a more comprehensive fracture network system (a utilization channel) in the low-cost water injection mode. Under the application of the two water injection technologies, the invention enables the productivity of the treatment effect deterioration well, the water injection failure well, the low-productivity well and the like to be increased, and meets the sustainable water injection development requirement; the continuous production of the oil well is ensured, meanwhile, the stratum energy can be supplemented efficiently, the oil well is ensured to be in a healthy state, and the recovery efficiency is improved. In addition, the bottom water imitation and fracturing imitation high-pressure water injection technology has wide application prospect for other domestic fractured oil reservoirs or compact oil reservoirs.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further 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 step diagram of a method for implementing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir according to an embodiment of the application.
Fig. 2 is a schematic diagram of the principle of water injection construction by using a bottom water simulating high-pressure water injection technology in the implementation method of the high-pressure water injection technology for the fractured-vuggy carbonate reservoir in the embodiment of the application.
Fig. 3 is a schematic diagram of the principle of water injection construction by using a fracture-simulating high-pressure water injection technology in the implementation method of the high-pressure water injection technology for the fractured-vuggy carbonate reservoir according to the embodiment of the application.
Fig. 4 is a block diagram of a high-pressure water injection technology implementation system for a fractured-vuggy carbonate reservoir according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The development of the fractured-vuggy carbonate reservoir is characterized by high productivity at the initial stage of production, fast decrement of yield and energy at the middle and later stages and need of water injection to supplement the reservoir energy. The water injection in the initial stage of the fracture-cavity type oil reservoir water injection depends on experience to meet the development requirement of rapid production, but basic oil reservoir parameters such as porosity and permeability of the fracture-cavity type oil reservoir are difficult to determine, so that the theory of how to inject water is always in a difficult exploration period. After long-term practice and theoretical research, the problem of quantitative water injection of the dissolved-fluid reservoir is solved in 2015, large-scale water injection development is realized, and high-quality scientific development is met. However, with the long-term water flooding development of the solution-fractured oil reservoir, the water flooding effect is degraded in 2017.
Because the conventional water injection for the fracture-cavity oil reservoir is limited by factors such as total injection amount, water injection pressure, water injection displacement and the like, the conventional water injection for the fracture-cavity oil reservoir can preferentially enter an advantageous displacement range in the water injection process and cannot affect the whole oil reservoir, so that the water injection period of validity is short, the low injection-production ratio and the low injection-storage ratio fail, and the effect of improving the recovery ratio amplitude is limited.
Therefore, in order to solve the technical problems, the invention provides a method and a system for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir. The method and the system firstly analyze the well-reservoir relationship, the reservoir type, the reservoir distribution form, the reservoir internal structure and other aspects of the reservoir area to be constructed, then determine the high-pressure water injection mode according with the current oil field state according to the area analysis result, design the construction parameters aiming at each mode, and carry out high-pressure water injection operation on the reservoir area according to the corresponding construction parameters so as to carry out long-term and efficient treatment on the oil field area and improve the water injection recovery ratio. The invention provides a high-pressure water injection technology (bottom water simulating high-pressure water injection technology) capable of achieving the technical effect of bottom water control of a partition plate, and the principle of the technology is that the bottom water control technology of the partition plate is simulated through high-pressure water injection construction, the total water injection amount and the water injection pressure (bottom flow pressure) are improved, injected water can be ensured to fully enter the deep part of an oil reservoir, artificial secondary bottom water is created, an oil-water interface is gradually lifted, the energy of the oil reservoir is supplemented, so that residual oil is displaced from bottom to top, the volume of the oil reservoir is displaced, the used reserve is more comprehensive, and the swept range is enlarged. In addition, the invention also provides a high-pressure water injection technology (simulating fracturing high-pressure water injection) capable of achieving the technical effect of hydraulic fracturing, the principle of the technology is that the hydraulic fracturing technology is simulated through high-pressure water injection construction, rock fracture and crack formation are realized by improving water injection pressure (bottom hole flowing pressure) and injecting discharge capacity, meanwhile, the purpose of continuous crack extension is achieved by increasing the total water injection amount, whether an oil reservoir body is in an energy supplement state is monitored in real time, water injection is stopped after the energy supplement-free state is achieved for a period of time, during the period, the energy of the whole oil reservoir body is supplemented in the process of communicating the favorable oil reservoir body, and a more comprehensive (wider) oil reservoir fracture network utilization system (utilization channel) is established by using a low-cost high-pressure water injection method.
Thus, under the application of the two high-pressure water injection technologies, the invention realizes the capacity increase aiming at the well with the poor treatment effect of the traditional water injection operation, meets the sustainable water injection development requirement and further improves the water injection recovery ratio.
Fig. 1 is a step diagram of a method for implementing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir according to an embodiment of the application. As shown in FIG. 1, the method for implementing the high-pressure water injection technology comprises the following steps: step S110, analyzing the well storage relation of the current oil reservoir area, and/or the comparison result of the static reserves and the utilization reserves, and/or the state of the current utilization channel according to the static seismic data of the oil reservoir area to be constructed to obtain the corresponding area analysis result; step S120, according to the area analysis result obtained in the step S110, determining a water injection mode suitable for the current oil reservoir area, and according to a construction principle corresponding to the current water injection mode, obtaining construction parameters including total water injection amount and/or water injection displacement, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel; and finally, step S130, performing high-pressure water injection operation on the current oil reservoir region according to the current water injection mode by using the construction parameters designed in step S120.
The method for implementing the high-pressure water injection technology of the present invention is described in detail below with reference to fig. 1.
In step S110, in the embodiment of the present invention, an oil field area where a well that has failed in a conventional waterflooding operation or a well that needs to be waterflooded is used as a reservoir area to be constructed, and first, static seismic data about the reservoir area to be constructed needs to be obtained. And then, respectively analyzing the well-storage relationship of the current oil reservoir area to be constructed, and/or the comparison result of the static reserve and the oil reserve used, and/or the state of the current oil channel used, so as to obtain the information of the well-storage relationship in the current oil reservoir area to be constructed, the spreading form of each reservoir body in the oil reservoir area, the type of each reservoir body in the oil reservoir area, the distribution condition of each reservoir body in the oil reservoir area, the internal structure of each reservoir body in the oil reservoir area and the like, and further obtain the area analysis result aiming at the current oil reservoir area to be constructed.
It should be noted that the well-reservoir relationship refers to a connection matching relationship between a production well shaft in the oil reservoir region and each reservoir body in the oil reservoir region under the action of the current water injection operation. Wherein, the connection matching relationship includes but is not limited to: positional relationship, degree of opening, and degree of communication. The matching degree of the well-reservoir relationship refers to the communication degree and the opening degree between the position of a production well shaft in the oil reservoir region acted by the current water injection operation and the positions of various reservoirs in the oil reservoir region. Specifically, if the coincidence degree and the communication degree of the position of the shaft and the position of the reservoir are high, the well storage matching degree is high, and the well storage relationship is good; on the contrary, if the coincidence degree of the position of the shaft and the position of the reservoir body is low and/or the communication degree is low, the well-storage matching degree is low and the well-storage relationship is poor.
After the regional analysis result of the current reservoir region is obtained, the process proceeds to step S120. In step S120, a high-pressure water injection mode adapted to the current reservoir region needs to be determined according to the region analysis result obtained in step S110. Specifically, when determining the high-pressure water injection mode, a first oil reservoir region formed by un-communicated effective reservoir bodies at each position in the current oil reservoir region needs to be determined; and then, according to the relative position relation between the production well acted by the current high-pressure water injection construction and the current first region, and by combining the comparison result of the static reserve and the utilization reserve and/or the state of the current utilization channel, determining whether the bottom water simulating high-pressure water injection technology or the fracturing simulating high-pressure water injection technology is adopted to carry out high-pressure water injection operation on the current oil reservoir region.
Further, in an embodiment of the present invention, when the production well acted by the current construction is located in the middle of the current first oil reservoir region, and when the used reserve in the current oil reservoir region to be constructed is lower than the static reserve in the region, a bottom water-imitating high-pressure water injection technology needs to be performed on the current oil reservoir region to be constructed, so as to increase the swept range of the oil reservoir region. In practical applications, when a production well is located in the middle of an unconnected reservoir throughout a zone, the indirect drilling around the current production well often matches among the available reservoirs: well-to-reservoir relationship combinations of near well fracture type collective, and far well vug type reservoirs. Thus, in the embodiment of the invention, the dead wells with better well-reservoir relationship matching and lower reserves are used for implementing the bottom water simulating high-pressure water injection operation, so that the swept range of the effective reservoir body is enlarged to communicate with a larger range of oil reservoir regions.
Further, in an embodiment of the present invention, when the production well acted by the current construction is located at an edge position of the current first reservoir region, and when the current exploitation channel is damaged or not established, a fracture-simulating high-pressure water injection technology needs to be performed on the current reservoir region to be constructed, so as to establish a new effective exploitation channel. In practical applications, there are currently multiple sets of fracture-cavity reservoirs around a production well when the production well is located at the edge of an unconnected reservoir throughout the area. Thus, in embodiments of the invention, for wells with poorly matched well-reservoir relationships and impaired or non-established access pathways, typically characterized by a failed conventional waterflooding operation, it is desirable to perform frac-simulating high pressure waterflooding operations on such production wells to communicate a greater range of reservoir zones by establishing access pathways.
Further, after determining the water injection manner corresponding to the current construction operation, in step S120, the construction parameters required by the current high-pressure water injection operation need to be designed according to the construction principle corresponding to the currently determined water injection manner. Wherein, the construction parameters include but are not limited to: total water injection amount and/or displacement of water injection.
Further, in an embodiment of the present invention, when determining that the bottom water imitating high-pressure water injection technology is used for performing water injection construction on the current oil field area, a first total water injection amount corresponding to the current water injection manner (bottom water imitating high-pressure water injection technology) needs to be determined, and a corresponding first water injection displacement is determined according to the (first) water injection duration. In the embodiment of the present invention, the total amount of the first water injection is preferably: the product of the unit pressure drop liquid production amount when the current reservoir area to be constructed is acted and the utilization pressure difference when the current reservoir area to be constructed is acted. It should be noted that, the length of the (first) water injection period is not specifically limited, and can be set by a person skilled in the art according to actual requirements. During actual construction, a water injection monitoring technology is needed to be utilized to monitor the real-time displacement of the water injection fluid at the wellhead of the production well in real time so as to keep the real-time displacement of the current water injection operation in a stable state and maintain the displacement close to the first water injection displacement.
After the first water injection displacement is designed, a first water injection pressure corresponding to a current water injection mode (bottom water simulating high-pressure water injection technology) needs to be determined. In the embodiment of the present invention, the first water injection pressure is preferably: the sum of the average reservoir area pressure when the reservoir area to be constructed is acted and the exploitation pressure difference when the reservoir area to be constructed is acted. During actual construction, a water injection monitoring technology is needed to be utilized to monitor the real-time flowing pressure of the water injection fluid at the bottom of the production well in real time so as to keep the real-time flowing pressure to be greater than the first water injection pressure.
Therefore, the total water injection amount and the total water injection pressure under the technology can be higher than those corresponding to the conventional water injection operation in a mode of improving the total water injection amount and the water injection pressure, so that the injected water can more fully enter deep parts which are not communicated with effective reservoir bodies in the region, the artificial secondary low water level is favorably created, the oil-water interface is lifted, the energy supplement is continuously carried out on the oil reservoir, and the displacement oil reservoir volume is wider.
Further, in a specific embodiment of the present invention, when it is determined that a fracture-simulating high-pressure water injection technology is used to perform water injection construction on a current oilfield area, a second water injection displacement corresponding to a current water injection manner (fracture-simulating high-pressure water injection technology) needs to be determined first. It should be noted that the second water injection displacement is not specifically limited by the present invention, and may be set by a person skilled in the art according to actual needs. During actual construction, a water injection monitoring technology is needed to be utilized to monitor the real-time displacement of the water injection fluid at the wellhead of the production well in real time so as to keep the real-time displacement of the current water injection operation in a stable state and maintain the displacement close to the second water injection displacement.
After the second water injection displacement is designed, a second water injection pressure corresponding to the current water injection mode (bottom water simulating high-pressure water injection technology) needs to be determined. In the embodiment of the present invention, the second water injection pressure is preferably: formation fracture pressure when acting on the area of the reservoir currently being constructed. During actual construction, the real-time flowing pressure of the water injection fluid at the bottom of the production well needs to be monitored in real time by using a water injection monitoring technology so as to keep the real-time flowing pressure greater than or approximate to the second water injection pressure.
Therefore, the total water injection amount and the water injection pressure under the technology can be higher than those corresponding to the conventional water injection operation by improving the total water injection amount and the water injection pressure, so that the injected water can replace the traditional hydraulic fracturing technology, the purpose of establishing a reserve utilization channel is achieved by using a bottom water simulating high-pressure water injection technology with lower cost, a technical scheme for improving the productivity is provided for a low-yield well with invalid water injection, invalid water injection and poor well storage relation, and the recovery ratio is effectively improved.
Further, after the construction parameter information required for the current construction work is determined, the process proceeds to step S130. In step S130, for different water injection modes, corresponding high-pressure water injection construction is performed on the oil reservoir regions in different oil reservoir environments, and the real-time flow rate at the wellhead and the bottom-hole flowing pressure of the production well acted by the construction are monitored at the same time. It should be noted that when the water injection operation transformation is performed on the current oil reservoir region to be constructed, the water injection operation transformation may be performed on different production wells to improve the single-well recovery ratio of the corresponding production wells, so as to indirectly implement the high-pressure water injection construction on the current oil reservoir region.
Further, in a specific embodiment of the present invention, when the designed construction parameters are utilized to perform bottom water simulating high-pressure water injection construction (bottom water simulating high-pressure water injection construction, in which injected water is directly injected into the downhole from the current production well instead of fluid required by the baffle bottom water control technology), on one hand, real-time displacement of the wellhead of the current production well is monitored in real time, and it is ensured that current real-time displacement data is maintained at the first water injection displacement, so that the displacement of the current high-pressure water injection operation is maintained in a stable state.
Meanwhile, in the practical water injection operation implementation process, the real-time discharge capacity of the bottom water simulating high-pressure water injection construction needs to be monitored according to the mode, and the bottom flowing pressure of the current production well needs to be synchronously monitored. Specifically, when the real-time discharge capacity of the wellhead of the production well is monitored, the bottom hole flowing pressure of the current production well needs to be monitored in real time, and it is guaranteed that the real-time bottom hole flowing pressure data are larger than the first water injection pressure.
Therefore, the higher total water injection amount and water injection pressure level of the current bottom water simulating high-pressure water injection technology compared with the traditional water injection operation are guaranteed, the continuity of the energy supplement state of an oil field area is guaranteed, the function of converting a bottomless water reservoir with rapid energy reduction to a bottom water reservoir with controllable energy is realized through artificial water injection, the simulation of the partition bottom water control technology by utilizing the high-pressure water injection operation is realized, the geological condition that the oil reservoir is natural and insufficient is broken, and the upper limit of the validity period of conventional water injection is broken through.
Further, in a specific embodiment of the present invention, when the designed construction parameters are utilized to perform the fracturing-simulated high-pressure water injection construction (the fracturing-simulated high-pressure water injection construction is that the injected water is directly injected into the well from the current production well instead of the fluid required by the hydraulic fracturing technology), on one hand, the bottom-hole flowing pressure of the current production well is monitored in real time, and the real-time bottom-hole flowing pressure data is ensured to be greater than or approximate to the second water injection pressure.
Meanwhile, in the actual water injection operation implementation process, the real-time bottom hole flowing pressure of the fracturing-simulated high-pressure water injection construction needs to be monitored according to the mode, and the real-time wellhead discharge capacity and the (second) water injection duration of the current production well need to be synchronously monitored so as to improve the total water injection amount of the fracturing-simulated high-pressure water injection construction. Specifically, while monitoring the real-time bottom hole flowing pressure of the current production well, the wellhead discharge capacity and the (second) water injection duration of the current production well need to be monitored in real time, so that when the wellhead pressure of the production well acted by the current construction operation is in a rising state, the injected water is still in an energy supplement state, and the water injection operation is not considered to be stopped until the wellhead pressure of the current production well is reduced, thereby ensuring the action degree of the current water injection operation on the production well under the condition of keeping a high injection total amount grade.
Specifically, water injection construction operation is carried out according to the second water injection displacement, so that the water displacement of the current high-pressure water injection operation is kept in a stable state, meanwhile, the real-time water injection amount is recorded, and the real-time oil pressure and the real-time casing pressure of the wellhead of the current production well are monitored; then, synchronously drawing a water injection indication curve matched with the current water injection construction state according to the real-time water injection amount data, the real-time oil pressure data and the real-time casing pressure data; and finally, observing the dynamically changed water injection indication curve, and immediately stopping or keeping the current water injection construction for a preset time period when the water injection indication curve reaches a descending section of the water injection indication curve or a second slow section after the inflection point of the curve. Referring to fig. 3, in the embodiment of the present invention, the water injection indication curve includes, but is not limited to: a water injection time-dependent (production well mouth) real-time water injection rate variation curve, a water injection time-dependent (production well mouth) real-time oil pressure variation curve, and a water injection time-dependent (production well mouth) real-time oil pressure variation curve. It should be noted that, the duration of the preset time period is not specifically limited, and those skilled in the art can set the duration according to actual needs.
In the actual application process, in the rising stage of the water injection indication curve, it indicates that the wellhead pressure of the production well continuously rises, so that it is reflected that the injected water injected in the current water injection operation is continuously supplementing energy to the oil reservoir block where the current production well is located, that is, the energy supplementing state of the injected water to the current oil reservoir block is effective (the effect is reflected in being capable of effectively improving the recovery ratio of the current oil reservoir block to the current production well). In addition, when the descending section of the water injection indication curve or the second slow section after the inflection point of the curve is reached, the wellhead pressure of the current production well is in the descending section, so that the fact that the injected water injected in the current water injection operation cannot effectively supplement energy for the oil reservoir block where the current production well is located is reflected. At this moment, the current high-pressure water injection operation based on the fracturing simulation technology needs to be considered to be stopped, so that the water injection duration of the current fracturing simulation high-pressure water injection construction is dynamically adjusted through the dynamic change state of the wellhead pressure of the production well, the water injection total amount of the water injection operation is ensured to achieve the undistorted effect, and the water injection total amount can really and effectively act on the oil reservoir area to which the current production well belongs.
Therefore, the higher total water injection amount and water injection pressure level of the current fracturing-simulated high-pressure water injection technology compared with the traditional water injection operation are guaranteed, the continuity and undistortion of the energy supplement state of an oil field area are guaranteed, the function of establishing a fracturing modification channel (namely the channel for communicating a reservoir body with a current production well, which can be fractured around the current production well by the traditional fracturing technology) is realized through manual water injection, the simulation of the hydraulic fracturing technology by using the high-pressure water injection operation is realized, the recovery efficiency (productivity) of low-yield wells with water injection failure, poor well storage relation and the like is further improved, and the upper limit of the validity period of the conventional water injection is broken through.
The application principle, construction parameter design, application effect and the like of the bottom water simulating high-pressure water injection technology are described below by taking the technology as an example of applying the technology to a TP24CH2 production well. Fig. 2 is a schematic diagram of the principle of water injection construction by using a bottom water simulating high-pressure water injection technology in the implementation method of the high-pressure water injection technology for the fractured-vuggy carbonate reservoir in the embodiment of the application.
Taking a TP24CH2 well as an example, fig. 2(a) shows static seismic data of a fast oil reservoir region where the TP24CH2 well is located, and it can be known from an analysis of fig. 2(a) that a first oil reservoir region formed by not directly drilling and encountering an effective reservoir body around the TP24CH2 well is a well-reservoir relationship combination of a near-well fractured reservoir and a far-well vuggy reservoir. FIG. 2(b) shows the log energy curve for a TP24CH2 well when the current reservoir area to be constructed is active (where the data points inside the box represent the bottom hole flow pressure during a blowout and the data points outside the box represent the bottom hole flow pressure during a pumping), as can be seen from the energy indication curve, the wellIs obviously two-stage, reflects different reservoir spaces used under different pressure differences, and the unit pressure drop oil production reaches 264m after the pumping stage increases the used pressure difference by 20MPa compared with the self-injection stage3In MPa. The later production is characterized by poor oil replacing effect by water injection and 3000m of periodic water injection amount before treatment3And the cycle oil production is only 576 t. The water injection effect of the earlier injected water is deteriorated due to the high using degree of the dominant channel, so that the bottom water injection imitation treatment is implemented. Designing the total amount of water injection: minimum water injection amount is 20MPa 264m3/MPa＝5280m3Therefore, the water injection amount is controlled to be 3000m before treatment3Lifting to 6000m3。
After the TP24CH2 well is constructed by simulating bottom water high-pressure water injection, the periodic oil increasing amount is increased from 576t to 2112t, the oil change rate of each square of water is increased from 0.15 to 0.29, the replacement efficiency is increased by nearly 1 time, and the effect is obvious.
The application principle, construction parameter design, application effect and the like of the technology are explained below by taking the fracture-simulated high-pressure water injection technology as an example for acting on a TK829 production well. Fig. 3 is a schematic diagram of the principle of water injection construction by using a fracture-simulating high-pressure water injection technology in the implementation method of the high-pressure water injection technology for the fractured-vuggy carbonate reservoir according to the embodiment of the application.
Taking the TK829 well as an example, FIG. 3(a) shows the fast static seismic data of the oil reservoir region where the TK829 well is located, and it can be seen from the analysis of FIG. 3(a) that the TK829 well is located at the edge of the first reservoir region formed by the reservoir bodies which are not effectively controlled, and meanwhile, the combination of multiple sets of fracture holes is adopted, and the production dynamics is represented as that the conventional water injection has failed. As the well has obvious unsmooth reservoir bodies, the potential of further building a fracture network utilization system is provided, and the fracturing-simulated high-pressure water injection can be carried out. Designing water injection pressure: the fracture extension pressure coefficient of the well stratum fracture is 0.015MPa/m, so that the bottom hole pressure required by fracture extension needs to reach 88.3MPa to achieve the rock fracture effect. Fig. 3(b) shows a water injection indication curve of the TK829 well, and according to the change of the water injection indication curve, the water injection operation may be stopped until the water injection duration reaches at least the second slow section, so as to ensure the total water injection amount of the technology.
After the TK829 well is constructed by the simulated fracturing high-pressure water injection, the well is recovered to a self-blowing well due to insufficient liquid supply and poor oil replacing effect by water injection, a 3mm oil nozzle is adopted at present, the oil pressure is 11.4MPa, the daily produced fluid is 23.3t, the daily produced oil is 23.1t, the water content is 0.7%, and the oil increment is 3453t in stages.
On the other hand, based on the implementation method of the high-pressure water injection technology for the fractured-vuggy carbonate rock reservoir, the invention also provides a system for implementing the high-pressure water injection technology for the fractured-vuggy carbonate rock reservoir. Fig. 4 is a block diagram of a high-pressure water injection technology implementation system for a fractured-vuggy carbonate reservoir according to an embodiment of the present disclosure. As shown in fig. 4, the system for implementing high-pressure water injection technology in the present invention includes: a reservoir region analysis module 41, a water injection parameter design module 42 and a water injection construction module 43.
Specifically, the reservoir region analysis module 41 is implemented according to the method described in step S110, and is configured to analyze the well-reservoir relationship of the current reservoir region, and/or the comparison result between the static reservoir volume and the current displacement volume, and/or the state of the current displacement channel according to the static seismic data of the reservoir region to be constructed, so as to obtain the corresponding region analysis result. The water injection parameter design module 42 is implemented according to the method described in the step S120, and is configured to determine a water injection manner adapted to the current oil reservoir region according to the region analysis result obtained by the oil reservoir region analysis module 41, and obtain construction parameters including the total water injection amount and/or the displacement of water injection according to the construction principle corresponding to the current water injection manner. The water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel. The water injection construction module 43 is implemented according to the method described in the above step S130, and is configured to perform high-pressure water injection operation on the current oil reservoir region according to a water injection manner by using the construction parameters obtained by the water injection parameter design module 42.
Further, the water injection parameter design module 42 includes: a construction mode generating unit 421 and a construction parameter generating unit 422. The construction mode generating unit 421 is configured to determine a water injection mode adapted to the current oil reservoir region according to the current region analysis result. The construction parameter generating unit 422 is configured to obtain construction parameters including total water injection amount and/or displacement of water injection according to the water injection manner of the current oil reservoir region and the construction principle matched with the current water injection manner. The construction method generating unit 421 is further configured to implement a bottom water simulating high-pressure water injection technology on the current oil reservoir area to increase the coverage area of the oil reservoir area when the production well acted by the current construction is located at the middle position of the un-communicated effective reservoir body in the current oil reservoir area and the utilization reserve is lower than the static reserve. In addition, the construction method generating unit 421 is further configured to perform a fracture-simulating high-pressure water injection technique on the current oil reservoir region to establish the oil-producing channel when the production well acted by the current construction is located at the edge of the unconnected effective reservoir body in the oil reservoir region and when the current oil-producing channel is damaged or not established.
The invention relates to a method and a system for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir. The method and the system provide a high-pressure water injection technology which is suitable for different types of well-storage relation combination, and/or the distribution form of each reservoir body in an oil reservoir area, and/or the distribution condition of each reservoir body in the oil reservoir area, and/or the internal structure of each reservoir body in the oil reservoir area through the deep research on the oil-displacing mechanism by water injection, the water-flooding mechanism and the development phenomenon, and the high-pressure water injection technology comprises the following steps: the simulated bottom water high-pressure water injection technology is used for simulating the bottom water control technology of the partition plate to expand the spread range in a low-cost water injection mode, and the simulated fracturing high-pressure water injection technology is used for simulating the hydraulic fracturing technology to establish a more comprehensive fracture network system (a utilization channel) in the low-cost water injection mode. Under the application of the two water injection technologies, the invention enables the productivity of the treatment effect deterioration well, the water injection failure well, the low-productivity well and the like to be increased, and meets the sustainable water injection development requirement; the continuous production of the oil well is ensured, meanwhile, the stratum energy can be supplemented efficiently, the oil well is ensured to be in a healthy state, and the recovery efficiency is improved. In addition, the bottom water imitation and fracturing imitation high-pressure water injection technology has wide application prospect for other domestic fractured oil reservoirs or compact oil reservoirs.
The invention is comprehensively popularized and applied in Tahe oil field at present, and the oil yield is increased to 4418 tons.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for realizing a high-pressure water injection technology for a fractured-vuggy carbonate reservoir is characterized by comprising the following steps of:
analyzing the well-reservoir relationship of the current reservoir area, and/or the comparison result of the static reserve and the used reserve, and/or the state of the current used channel according to the static seismic data of the reservoir area to be constructed to obtain the corresponding area analysis result;
determining a water injection mode suitable for the current oil reservoir area according to the area analysis result, and obtaining construction parameters including total water injection quantity and/or water injection displacement according to a construction principle corresponding to the water injection mode, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel;
and performing high-pressure water injection operation on the current oil reservoir region according to the water injection mode by using the construction parameters.
2. The method of claim 1, wherein the step of determining a waterflooding mode adapted to the current reservoir region according to the region analysis result comprises:
and when the production well acted by the current construction is positioned in the middle position of the un-communicated effective reservoir body in the current oil reservoir area and the oil utilization reserve is lower than the static reserve, implementing the bottom water simulating high-pressure water injection technology on the current oil reservoir area so as to increase the swept range of the oil reservoir area.
3. The method of claim 2, wherein when determining that the bottom water simulating high pressure water injection technology is adopted to carry out water injection construction on the current oil reservoir area, the construction parameters are designed according to the following steps:
determining a first total water injection amount corresponding to the current water injection mode, and determining a corresponding first water injection displacement according to the water injection duration, wherein the first total water injection amount is the product of the unit pressure drop liquid production amount and the pressure difference for use when the current oil reservoir region acts;
and determining a first water injection pressure corresponding to the current water injection mode, wherein the first water injection pressure is the sum of the average pressure and the differential pressure of the oil reservoir region when the current oil reservoir region acts.
4. The method of claim 3, wherein when the construction parameters are used for carrying out bottom water simulating high-pressure water injection construction on the current oil reservoir area, the method comprises the following steps:
monitoring the real-time displacement of the wellhead of the current production well, and ensuring that the real-time displacement is kept at the first water injection displacement; and
and monitoring the bottom hole flowing pressure of the production well in real time, and ensuring that the real-time bottom hole flowing pressure is greater than the first water injection pressure.
5. The method according to any one of claims 1 to 4, wherein in determining a water injection mode adapted to the current reservoir region according to the region analysis result, the method further comprises:
and when the production well acted by the current construction is positioned at the edge position of the un-communicated effective reservoir body in the oil reservoir area and the current oil reservoir area is in a damaged or un-established state, implementing the simulated fracturing high-pressure water injection technology on the current oil reservoir area so as to establish a flow channel.
6. The method of claim 5, wherein when determining to perform water injection construction on the current oil reservoir region by adopting the simulated fracture high-pressure water injection technology, the construction parameters are designed according to the following steps:
determining a second water injection displacement corresponding to the current water injection mode;
and determining a second water injection pressure corresponding to the current water injection mode, wherein the second water injection pressure is the stratum fracture pressure when the current oil reservoir area acts.
7. The method of claim 6, wherein when the construction parameters are used for carrying out the fracturing-simulating high-pressure water injection construction on the current oil reservoir area, the method comprises the following steps:
monitoring the bottom hole flowing pressure of the production well in real time to ensure that the real-time bottom hole flowing pressure is greater than or approximate to the second water injection pressure;
and performing water injection construction operation according to the second water injection displacement, recording the real-time water injection amount of the wellhead of the production well, monitoring the real-time oil pressure and the real-time casing pressure of the wellhead of the production well, synchronously drawing a water injection indication curve matched with the current water injection construction state based on the real-time oil pressure and the real-time casing pressure, and stopping the current water injection construction when reaching a second slow-down section after a descending section or an inflection point of the water injection indication curve.
8. A high pressure water injection technology implementation system for a carbonate fracture-cavity reservoir, the system comprising:
the oil reservoir area analysis module is configured to analyze the well-reservoir relationship of the current oil reservoir area, and/or the comparison result of the static reserve and the oil-using reserve, and/or the state of the current oil-using channel according to the static seismic data of the oil reservoir area to be constructed, so as to obtain the corresponding area analysis result;
a water injection parameter design module configured to determine a water injection mode adapted to the current oil reservoir region according to the region analysis result, and obtain construction parameters including total water injection amount and/or water injection displacement according to a construction principle corresponding to the water injection mode, wherein the water injection mode is selected from one of a bottom water simulating high-pressure water injection technology for creating an artificial secondary bottom level and a fracturing simulating high-pressure water injection technology for establishing a reserve utilization channel;
and the water injection construction module is configured to implement high-pressure water injection operation on the current oil reservoir region according to the water injection mode by utilizing the construction parameters.
9. The system of claim 8, wherein the water injection parameter design module comprises:
and the construction mode generating unit is configured to implement the bottom water simulating high-pressure water injection technology on the current oil reservoir area to enlarge the sweep range of the oil reservoir area when the production well acted by the current construction is positioned at the middle position of the un-communicated effective reservoir body in the current oil reservoir area and the utilization reserve is lower than the static reserve.
10. The system of claim 8 or 9, wherein the water injection parameter design module comprises:
and the construction mode generating unit is configured to implement the simulated fracturing high-pressure water injection technology on the current oil reservoir area to establish a flow channel when a production well acted by current construction is positioned at the edge position of an unconnected effective reservoir body in the oil reservoir area and the current flow channel is damaged or in an unconnected state.
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