CN107869334B - Layer system recombination and exploitation method of multi-layer sandstone oil reservoir in middle and later stages of water injection development - Google Patents
Layer system recombination and exploitation method of multi-layer sandstone oil reservoir in middle and later stages of water injection development Download PDFInfo
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Abstract
The invention provides a layer system recombination and exploitation method for multilayer sandstone oil hiding in the middle and later stages of water injection development. It includes: recombining the multi-layer sandstone oil reservoirs in the middle and later stages of water injection development into three development layers, wherein the oil layers with the communication coefficient of more than 80%, the water content of less than 20%, the extraction degree of less than 10% and the pressure coefficient of more than 0.8 are combined into a first development layer; combining the oil layer with the communication coefficient of 60-80%, the water content of 20-60%, the extraction degree of 10-15% and the pressure coefficient of 0.6-0.8 into a second development layer system; combining the oil layer with the communication coefficient less than 60%, the water content more than 60%, the extraction degree more than 15% and the pressure coefficient less than 0.6 into a third development layer system; and (4) exploiting each set of development layer series. The technical scheme provided by the invention realizes the effective utilization of the multilayer sandstone oil reservoir with extremely unbalanced utilization degree of each layer in the middle and later stages of water injection development, and improves the water drive development effect of the oil reservoir.
Description
Technical Field
The invention relates to a layer system recombination and exploitation method of a multi-layer sandstone oil reservoir in the middle and later stages of water injection development, and belongs to the technical field of oil field development.
Background
The onshore water-drive reservoir in China mainly comprises a heterogeneous multilayer sandstone reservoir, which generally has the characteristics of long oil-containing well section, more small layers, large physical property change in longitudinal and transverse directions and serious heterogeneity, and most of oil fields adopt a straight well general injection production or traditional layered series development exploitation mode in the initial stage, so that the inter-layer contradiction is prominent, the reservoir exploitation degree is poor, the injected water single-layer suddenly enters, the water content of the oil well rises quickly, and the continuous improvement of the oil field development level is seriously restricted.
At present, most of the oil reservoirs in China enter a high water-cut or ultra-high water-cut period, the properties of oil field reservoirs in the ultra-high water-cut period are obviously changed, and the problems of high dispersion of residual oil on a plane, low perfection degree of an injection and production well pattern, poor reserve control degree, large difference of utilization of each layer in the longitudinal direction, serious interlayer interference and the like exist.
Conventionally, development layer system division is generally divided according to average parameters and deposition characteristics of reservoirs, changes of dynamic parameters are not considered, and the development layer system division is a layer system division in a general sense and is not suitable for development of the reservoirs in the period.
Therefore, providing a method for layer system recombination and exploitation of multilayer sandstone oil stored in the middle and later stages of water injection development to solve the increasingly serious interlayer contradiction problem becomes one of the technical problems to be solved in the field.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a layer system recombining and exploiting method of multilayer sandstone oil in the middle and later stages of water injection development, which can ensure that the physical property parameters and the exploiting degree of oil layers in each set of developed layer system are as close as possible, reduce the difference between layers, relieve the contradiction between layers and realize the effective use of various oil layers of different layer systems.
In order to achieve the aim, the invention provides a layer system recombination and exploitation method for multilayer sandstone oil hiding at the middle and later stages of water injection development, which comprises the following steps:
the multi-layer sandstone oil reservoir in the middle and later stages of water-flooding development is recombined into three development layers, wherein,
combining the oil layer with the communication coefficient more than 80%, the water content less than 20%, the extraction degree less than 10% and the pressure coefficient more than 0.8 into a first development layer system; namely, the combination of the first development layer series simultaneously meets the following conditions: the communication coefficient of each oil layer in the first development layer system is more than 80%, the water content is less than 20%, the extraction degree is less than 10%, and the pressure coefficient is more than 0.8;
combining the oil layer with the communication coefficient of 60-80%, the water content of 20-60%, the extraction degree of 10-15% and the pressure coefficient of 0.6-0.8 into a second development layer system; that is, the combination of the second set of development layers simultaneously satisfies the following conditions: the communication coefficient of each oil layer in the second development layer is 60-80%, the water content is 20-60%, the extraction degree is 10-15%, and the pressure coefficient is 0.6-0.8;
combining the oil layer with the communication coefficient less than 60%, the water content more than 60%, the extraction degree more than 15% and the pressure coefficient less than 0.6 into a third development layer system; namely, the combination of the third development layer series simultaneously meets the following conditions: the communication coefficient of each oil layer in the third development layer is less than 60%, the water content is greater than 60%, the extraction degree is greater than 15%, and the pressure coefficient is less than 0.6;
and utilizing the vertical well injection and production well pattern to produce the developed layer series in a sectional successive perforation mode.
The multilayer sandstone oil reservoir occupies a considerable proportion in domestic onshore water-drive oil reservoirs, the oil reservoirs generally have long oil-containing well sections, many oil layers, complex oil-water relationship, serious reservoir heterogeneity, large interlayer physical property difference, and even tens of thousands of times of partial block permeability level difference, the problems of long-term traditional layering system development or general vertical well development, gradually exposed outlet well section length, large interlayer utilization difference, serious multilayer high water content and the like are solved, great difficulty is brought to development dynamic adjustment, and the whole development effect of the oil reservoirs is limited. The technical scheme provided by the invention defines the technical limits of dynamic and static related parameters when the layer series are recombined, and the multilayer sandstone oil reservoir is recombined into a plurality of development layer series, so that the physical property parameters and the exploitation degree of the oil layer in each development layer series can be ensured to be as close as possible, the interlayer difference is reduced, the interlayer contradiction is alleviated, the effective use of various oil layers of different layer series is realized, a series of development problems of the oil reservoir adopting the traditional development mode are effectively solved, and the water drive development effect of the oil reservoir is improved.
In the method, preferably, when the development layer series is produced by using the vertical well injection and production well pattern through a sectional successive perforation mode, the method comprises the following processes:
deploying a vertical well injection and production well network, wherein injection and production wells in the vertical well injection and production well network are vertical wells;
and exploiting each set of development layer series by adopting a sectional successive perforation mode.
The method adopts the mode of replacing the perforation by the vertical well subsection to replace and develop different layer systems, effectively saves the drilling investment under the current low oil price form, simultaneously ensures that the residual recoverable reserve of a single well of the same set of development well pattern reaches the economic requirement, and brings great economic benefit.
In the method, preferably, the vertical well injection-production well pattern is a five-point injection-production well pattern, one of the five-point injection-production well pattern is a water injection vertical well, and the remaining four vertical wells are oil production vertical wells.
In the above method, the distance from the water injection vertical well to each oil extraction vertical well is preferably 150-250m, and more preferably 200 m.
In the above method, preferably, in the five-point injection and production well pattern, four oil production vertical wells form a quadrangle, and the water injection vertical well is located inside the quadrangle.
In the above method, preferably, in the five-point injection and production well pattern, four oil production vertical wells form a square, and the water injection vertical well is located at the central position inside the square.
In the above method, preferably, the side length of the square is 210-360m, and more preferably 280 m. The well pattern structure provided by the invention can effectively avoid the problem of easy water channeling in vertical well development and improve the control degree of the injection-production well pattern on oil reservoirs.
In the above method, preferably, the water injection vertical well and the oil production vertical well are provided with perforation sections corresponding to each set of development layer series; taking a water injection vertical well as an example, perforation sections are respectively arranged on the first development layer set, the second development layer set and the third development layer set.
In the method, preferably, the exploiting each set of development strata by means of subsection-replacement perforation by using the vertical well injection and production well pattern comprises the following processes:
and utilizing a vertical well injection and production well pattern to eject the first set of development layer series first to complete the exploitation of the first set of development layer series, then eject the second set of development layer series to complete the exploitation of the second set of development layer series, and finally eject the third set of development layer series to complete the exploitation of the third set of development layer series. The exploitation is carried out by adopting a mode of replacing perforation by vertical well sections, so that the corresponding injection and production of different layer systems are realized, the swept volume of an injected medium is enlarged, various oil layers are utilized to the maximum extent, and the potential of the oil layers is fully exerted.
In one embodiment, the method comprises:
the multi-layer sandstone oil reservoir in the middle and later stages of water-flooding development is recombined into three development layers, wherein,
combining the oil layer with the communication coefficient more than 80%, the water content less than 20%, the extraction degree less than 10% and the pressure coefficient more than 0.8 into a first development layer system;
combining the oil layer with the communication coefficient of 60-80%, the water content of 20-60%, the extraction degree of 10-15% and the pressure coefficient of 0.6-0.8 into a second development layer system;
combining the oil layer with the communication coefficient less than 60%, the water content more than 60%, the extraction degree more than 15% and the pressure coefficient less than 0.6 into a third development layer system;
deploying a vertical well injection and production well pattern, wherein the vertical well injection and production well pattern is deployed according to the structure of a five-point method injection and production well pattern; one of the five-point injection and production well patterns is a water injection vertical well, the remaining four wells are oil extraction vertical wells, and perforation sections corresponding to each set of development layer series are arranged on the water injection vertical well and the oil extraction vertical wells;
and (3) exploiting the three recombined development layer series in turn by adopting a mode of replacing the perforation by the vertical well subsection, wherein the exploitation process is as follows:
utilizing a water injection vertical well and a perforation section of an oil extraction vertical well, which are positioned at a first set of development layer series, to jet open the first set of development layer series, then converting the perforation section of the oil extraction vertical well, which is positioned at the first set of development layer series, into an oil extraction section, converting the perforation section of the water injection vertical well, which is positioned at the first set of development layer series, into a water injection section, and exploiting the first set of development layer series;
after the first development layer is exploited, utilizing the water injection vertical well and the perforation section of the oil extraction vertical well at the second development layer to jet open the second development layer, then converting the perforation section of the oil extraction vertical well at the second development layer into an oil extraction section, converting the perforation section of the water injection vertical well at the second development layer into a water injection section, and exploiting the second development layer;
and after the second development layer is produced, jetting a third development layer by using the water injection vertical well and the perforation section of the oil extraction vertical well at the third development layer, converting the perforation section of the oil extraction vertical well at the third development layer into an oil production section, converting the perforation section of the water injection vertical well at the third development layer into a water injection section, and producing the third development layer.
The invention has the beneficial effects that:
the technical scheme provided by the invention defines the technical limits of dynamic and static related parameters when the layers of the multilayer sandstone reservoir at the middle and later stages of water injection development are recombined, divides the multilayer sandstone reservoir into three development layers, optimizes the structure of an injection-production well pattern and an injection-production mode, can ensure that the physical parameters and the exploitation degree of an oil layer in each development layer are as close as possible, reduces the interlayer difference, relieves the interlayer contradiction, realizes the effective utilization of various oil layers of different layers, effectively solves a series of development problems of the oil reservoir adopting the traditional development mode, and improves the water drive development effect of the oil reservoir.
Drawings
Fig. 1 is a schematic diagram of the arrangement of multiple development systems and injection-production well network structures in an oil reservoir according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vertical well injection-production well pattern provided by an embodiment of the present invention;
FIG. 3 is a comparison of the production levels of the solution provided by the embodiment of the present invention and the prior art;
FIG. 4 is a comparison graph of the control degree of the water flooding reserves according to the embodiment of the present invention and the prior art;
FIG. 5 is a comparison graph of the water drive reserve usage levels of the present invention and the prior art;
the main reference numbers illustrate:
i, II and III all represent development systems; 1: injecting water into the vertical well; 11: the water injection vertical well 1 is arranged at a perforation section at the development layer series I; 12: the water injection vertical well 1 is arranged at a perforation section at the development layer system II; 13: the water injection vertical well 1 is arranged at a perforation section at the development layer series III; 21. 22, 23 and 24 each represent a production vertical well; 211: a perforation section of the oil production vertical well 21 at the development layer series I; 212: a perforation section of the production vertical well 21 at the development layer system II; 213: a perforation section of the production vertical well 21 at the development layer system III; 221: a perforated section of the production vertical well 22 at the development formation I; 222: a perforated section of the production string 22 at the development formation II; 223: the production vertical well 22 is a perforated section at the development zone III.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Examples
The embodiment provides a layer system recombination and exploitation method for multilayer sandstone oil reservoir in the middle and later stages of water injection development, which mainly comprises the following steps:
the multi-layer sandstone oil reservoir in the middle and later stages of water-flooding development is recombined into three development layers, wherein,
combining the oil layer with the communication coefficient more than 80%, the water content less than 20%, the extraction degree less than 10% and the pressure coefficient more than 0.8 into a first development layer system I;
combining the oil layer with the communication coefficient of 60-80%, the water content of 20-60%, the extraction degree of 10-15% and the pressure coefficient of 0.6-0.8 into a second development layer system II;
combining the oil layer with the communication coefficient less than 60%, the water content more than 60%, the extraction degree more than 15% and the pressure coefficient less than 0.6 into a third development layer system III;
deploying a five-point injection and production well network (as shown in fig. 1 and 2, wherein fig. 1 is a cut-away view along the line a-a of fig. 2), wherein the injection and production wells in the well network are all vertical wells, one of the injection and production wells is a water injection vertical well and is marked as a water injection vertical well 1, the remaining four injection and production wells are oil production vertical wells and are respectively marked as an oil production vertical well 21, an oil production vertical well 22, an oil production vertical well 23 and an oil production vertical well 24, the four oil production vertical wells form a square, as shown in fig. 2, the distance between two adjacent oil production vertical wells is 280m, and the water injection vertical well is positioned at the central position inside the square;
the water injection vertical well and the oil extraction vertical well are provided with perforation sections (shown in figure 1) corresponding to each set of development layer series, taking the water injection vertical well 1 as an example, the development layer series I is provided with a perforation section 11, the development layer series II is provided with a perforation section 12, and the development layer series III is provided with a perforation section 13; the other four oil recovery vertical wells are also (the oil recovery vertical well 21 is provided with a perforation section 211 at the development layer series I, a perforation section 212 at the development layer series II, a perforation section 213 at the development layer series III, the oil recovery vertical well 22 is provided with a perforation section 221 at the development layer series I, a perforation section 222 at the development layer series II and a perforation section 223 at the development layer series III). In the actual process, the new well and the old well can be combined on the basis of the deployment of the old well pattern, and the injection-production well pattern is matched again.
And (3) exploiting the three development layer series in sequence by adopting a mode of replacing the perforation by the vertical well subsection, wherein the exploitation process is as follows:
the first development layer series I is firstly jetted through the perforation section of the development layer series I arranged by all the vertical wells (including the water injection vertical well and the oil extraction vertical well), then the perforation section 211 on the oil extraction vertical well 21 is converted into the oil extraction section, the perforation section 11 on the water injection vertical well 1 is converted into the water injection section, the perforation section 221 on the oil extraction vertical well 22 is also converted into the oil extraction section, and so on, and other oil extraction vertical wells are also used; producing said first set of development strata series I;
after the first set of development layer system I is produced, a second set of development layer system II is shot through the perforation sections of all the vertical wells arranged at the development layer system II, then the perforation section 212 on the oil production vertical well 21 is changed into an oil production section, the perforation section 12 on the water injection vertical well 1 is changed into a water injection section, the perforation section 222 on the oil production vertical well 22 is changed into an oil production section, and the like, and other oil production vertical wells are also the same; producing said second development interval II;
after the second development layer system II is exploited, the third development layer system III is shot through the perforation sections of all the vertical wells arranged at the third development layer system III, at this time, the perforation section 213 on the oil production vertical well 21 is converted into an oil production section, the perforation section 13 on the water injection vertical well 1 is converted into a water injection section, the perforation section 223 on the oil production vertical well 22 is converted into an oil production section, and so on, and other oil production vertical wells are also the same; completing the production of a third set of development layer series III.
As shown in fig. 3, 4 and 5, under the simulation calculation of the actual oil reservoir parameters, compared with the development effect of the vertical well general injection and production provided by the embodiment of the invention and the prior art, the technical scheme provided by the embodiment of the invention has the advantages that the final production degree is 10.2% higher than that of the prior art, the control degree of the water drive reserve is improved by 20.3%, and the utilization degree of the water drive reserve is improved by 17.6%; the existing vertical well general injection and production technology refers to all oil layers which are not divided into layers, the existing vertical well general injection and production technology is used as a set of layers, a set of vertical well patterns is utilized for production, and the technology can cause that the difference between layers is large because the difference of physical properties between the layers is large, and the technology cannot be used for fully digging and submerging various oil layers.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention. Moreover, it should be noted that the components of the present invention are not limited to the above-mentioned whole application, and the technical features described in the present specification can be selected from one or more alone or in combination according to actual needs, so that the present invention should cover other combinations and specific applications related to the innovation of the present application.
Claims (7)
1. A method for layer series recombination and exploitation of a multi-layer sandstone oil reservoir in the middle and later stages of waterflooding development comprises the following steps:
the multi-layer sandstone oil reservoir in the middle and later stages of water-flooding development is recombined into three development layers, wherein,
combining the oil layer with the communication coefficient more than 80%, the water content less than 20%, the extraction degree less than 10% and the pressure coefficient more than 0.8 into a first development layer system;
combining the oil layer with the communication coefficient of 60-80%, the water content of 20-60%, the extraction degree of 10-15% and the pressure coefficient of 0.6-0.8 into a second development layer system;
combining the oil layer with the communication coefficient less than 60%, the water content more than 60%, the extraction degree more than 15% and the pressure coefficient less than 0.6 into a third development layer system;
exploiting each set of development layer series by utilizing a vertical well injection and production well pattern in a sectional replacing perforation mode;
the injection wells and the production wells in the vertical well injection and production well network are all vertical wells; the vertical well injection-production well pattern is a five-point injection-production well pattern, one of the five-point injection-production well pattern is a water injection vertical well, and the rest four vertical wells are oil extraction vertical wells; the water injection vertical well and the oil extraction vertical well are provided with perforation sections corresponding to each set of development layer series;
the exploitation of the development layer series by utilizing the vertical well injection and production well pattern in a sectional successive perforation mode comprises the following processes:
the first development layer series is firstly jetted through the perforation sections of all the vertical wells in the vertical well injection and production well network, which are arranged at the first development layer series, then the perforation sections of the oil production vertical wells, which are arranged at the first development layer series, are converted into oil production sections, and the perforation sections of the water injection vertical wells, which are arranged at the first development layer series, are converted into water injection sections; producing said first set of development strata;
after the first set of development layer series is mined, shooting the second set of development layer series through the perforation sections of all the vertical wells arranged at the second set of development layer series, converting the perforation sections of the oil production vertical wells arranged at the second set of development layer series into oil production sections, and converting the perforation sections of the water injection vertical wells arranged at the second set of development layer series into water injection sections; producing said second set of development strata;
after the exploitation of the second development layer series is finished, ejecting the third development layer series through the perforation sections of all the vertical wells arranged at the third development layer series, wherein at the moment, the perforation sections of the oil production vertical wells arranged at the third development layer series are converted into oil production sections, and the perforation sections of the water injection vertical wells arranged at the third development layer series are converted into water injection sections; completing the production of the third set of development strata.
2. The method as claimed in claim 1, wherein the distance from the water injection vertical well to each oil recovery vertical well is 150-250 m.
3. The method of claim 1 wherein the water injection vertical is 200m from each oil recovery vertical.
4. The method according to claim 1 or 2, wherein in the five-point injection and production well pattern, four oil production vertical wells form a quadrangle, and the water injection vertical well is positioned inside the quadrangle.
5. The method according to claim 1 or 2, wherein in the five-point injection-production well pattern, four oil-production vertical wells constitute a square, and the water injection vertical well is located at a central position inside the square.
6. The method of claim 5 wherein the square has a side length of 210-360 m.
7. The method of claim 5, wherein the square has a side length of 280 m.
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