CN113847002B - Method for artificially inducing constructed oil and gas reservoir to generate gas cap oil displacement - Google Patents
Method for artificially inducing constructed oil and gas reservoir to generate gas cap oil displacement Download PDFInfo
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Abstract
The invention provides a method for generating gas cap oil displacement by artificial induction of a constructed oil and gas reservoir, which comprises the following steps: in the stage of constructing the gas cap, converting part of production wells for constructing the high part of the oil and gas reservoir into gas injection wells for gas injection, and simultaneously continuing to produce the other production wells for constructing the oil and gas reservoir; monitoring the produced gas-oil ratio of a production well for constructing a high part of an oil-gas reservoir in real time; gas is injected until the produced gas-oil ratio of a production well which is monitored to construct a high part of the oil-gas reservoir reaches a rated gas-oil ratio, and whether the injected gas amount is not less than a gas injection amount threshold value is judged; if the gas injection amount is not lower than the gas injection amount threshold value, closing a gas injection well for constructing the high part of the oil and gas reservoir and a production well for constructing the high part of the oil and gas reservoir for soaking until a gas cap is generated; and if the gas injection amount is lower than the gas injection amount threshold value, the residual production wells at the high part of the constructed oil and gas reservoir are converted into gas injection wells for gas injection, and after the gas injection is finished, the gas injection wells at the high part of the constructed oil and gas reservoir and the production wells at the high part of the constructed oil and gas reservoir are closed for well soaking until a gas cap is generated.
Description
Technical Field
The invention belongs to the technical field of the development of structured oil and gas reservoirs, and particularly relates to a method for generating gas cap oil displacement by artificial induction of a structured oil and gas reservoir.
Background
The artificial gas cap flooding is a development mode that gas is injected at the high part of the oil-gas reservoir structure, a secondary gas cap is formed at the high part of the structure by utilizing the gravity differentiation formed by the density difference of oil gas, and crude oil can be extracted by utilizing the expansion of the gas cap. In the later stage of water drive development of a fault block oil and gas reservoir, the problems of fast flooding of an oil well, fast water content rising, fast productivity reduction, difficulty in using residual oil at a high structure position and the like caused by edge-bottom water coning are usually faced. The development practice of oil and gas reservoirs at home and abroad proves that the special development mode of the artificial gas top drive is beneficial to relieving the problems of the oil and gas reservoirs, thereby improving the ultimate recovery ratio of the oil and gas reservoirs.
At present, the conventional method for building artificial gas cap at home and abroad is to close all production wells constructing high parts of an oil and gas reservoir at the stage of artificially generating the gas cap, select all or part of the production wells to be converted into gas injection wells for gas injection, and close the gas injection wells for soaking after the gas injection is finished. During the soaking process, the oil and gas two fluids start to respectively move downwards and upwards under the action of gravity differentiation, the gas is enriched to the high part of the structure to gradually form a secondary gas cap, and meanwhile, the residual oil at the high part of the structure is replaced to be enriched to the low part of the structure. However, the gravity differentiation effect is usually far smaller than the viscous resistance which needs to be overcome in the crude oil flowing process, so the soaking time needed when the artificial gas cap is built by adopting the conventional method is longer, and the problems of low replacement efficiency of injected gas, uneven front edge of the generated gas cap, difficult replacement of residual oil between wells and the like exist.
Disclosure of Invention
The invention aims to provide a method for forming gas cap oil displacement by artificial induction of an oil and gas reservoir, which improves the gas injection efficiency, shortens the soaking time and improves the replacement rate of injected gas when an artificial gas cap is built by using the method.
In order to achieve the aim, the invention provides a method for artificially inducing a constructed oil and gas reservoir to generate gas cap oil displacement, which comprises the following steps:
in the stage of constructing the gas cap, converting part of production wells for constructing the high part of the oil and gas reservoir into gas injection wells for gas injection, and simultaneously continuing to produce the other production wells for constructing the oil and gas reservoir; monitoring the produced gas-oil ratio of a production well for constructing a high part of an oil-gas reservoir in real time;
gas is injected until the produced gas-oil ratio of a production well which is monitored to construct a high part of the oil-gas reservoir reaches a rated gas-oil ratio, and whether the injected gas amount is not less than a gas injection amount threshold value is judged;
if the gas injection amount is not lower than the gas injection amount threshold value, closing a gas injection well for constructing the high part of the oil and gas reservoir and a production well for constructing the high part of the oil and gas reservoir for soaking until a gas cap is generated;
and if the gas injection amount is lower than the gas injection amount threshold value, the residual production wells at the high part of the constructed oil and gas reservoir are converted into gas injection wells for gas injection, and after the gas injection is finished, the gas injection wells at the high part of the constructed oil and gas reservoir and the production wells at the high part of the constructed oil and gas reservoir are closed for well soaking until a gas cap is generated.
In the method for generating gas cap flooding oil by artificial induction of the constructed oil and gas reservoir, preferably, the rated gasoline ratio is the gasoline ratio when a continuous gas diffusion zone is formed between injection wells and production wells at the high part of the constructed oil and gas reservoir;
more preferably, the rated gasoline ratio is 200-2000m 3 /m 3 。
In the above method for artificially inducing and generating gas cap flooding for a constructed oil and gas reservoir, preferably, the threshold value of the gas injection amount is determined based on the designed gas injection amount;
more preferably, the gas injection amount threshold is not less than 0.1 times the design gas injection amount;
in the above method for artificially inducing and generating gas cap flooding for the constructed hydrocarbon reservoir, preferably, the continuous production of the other production wells of the constructed hydrocarbon reservoir includes the continuous production of the production well of the constructed hydrocarbon reservoir which is not converted into the gas injection well, the continuous production of the middle production well of the constructed hydrocarbon reservoir and the continuous production of the low production well of the constructed hydrocarbon reservoir.
In the above method for artificially inducing and generating gas cap flooding for the constructed hydrocarbon reservoir, preferably, the middle position of the constructed hydrocarbon reservoir refers to a part of the constructed hydrocarbon reservoir with the burial depth at the middle 1/3 section.
In the above method for artificially inducing and generating gas cap flooding for the constructed hydrocarbon reservoir, preferably, the low part of the constructed hydrocarbon reservoir refers to a part of a 1/3 section of the constructed hydrocarbon reservoir with the deepest burial depth.
In the above method for artificially inducing and generating gas cap flooding for the constructed hydrocarbon reservoir, preferably, the high part of the constructed hydrocarbon reservoir refers to a part of a 1/3 section with the shallowest burial depth of the constructed hydrocarbon reservoir.
In the above method for generating gas cap flooding by artificial induction of the constructed hydrocarbon reservoir, preferably, the dip angle of the stratum of the constructed hydrocarbon reservoir is greater than 5 degrees.
The invention provides a method for constructing an oil-gas reservoir to generate gas cap oil displacement by artificial induction, which is a novel method for constructing an artificial gas cap by utilizing an artificial induction method according to the three-way seepage characteristic of the artificial gas cap. Compared with the conventional method for completely closing the production wells at the high-structured part when the artificial gas cap is constructed, the method for constructing the oil reservoir by artificially inducing the gas cap to generate the oil displacement by the gas cap does not completely close the production wells when the gas cap is constructed. In the stage of constructing the gas cap, firstly, selecting part of production wells at the high-structure part to be converted into gas injection wells for gas injection, remaining production wells are still mined, and injected gas is moved towards three directions of the high-structure part, the low-structure part and the plane area between the injection wells and the mining wells under the action of the production pressure difference between the injection wells and the mining wells at the high-structure part; when the produced gas-oil ratio of the constructed high-position production well reaches the rated gas-oil ratio, determining the follow-up operation according to the gas injection amount: if the gas injection amount is not lower than the gas injection amount threshold value, closing all wells at the high part of the constructed oil and gas reservoir, and stewing the wells until a gas cap is generated; if the gas injection amount is lower than the gas injection amount threshold value, other production wells at the high part of the structure are also converted into gas injection wells to continue gas injection, all wells at the high part of the structure oil and gas reservoir are closed after gas injection is finished, and the wells are stewed until gas cap is generated. Compared with the prior art, the technical scheme provided by the invention has the advantages that the gas injection efficiency is higher, the required soaking time is shorter, the injected gas replacement rate is higher when the artificial gas cap is built, and the method has important theoretical and practical significance for improving the artificial gas cap building efficiency and effectively developing and constructing residual oil at the high part.
Drawings
Fig. 1 is a schematic flow chart of a method for constructing a reservoir to generate gas cap flooding through artificial induction according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of well placement for a conventional artificial gas cap construction method.
FIG. 3 is a schematic diagram of a well placement for constructing an oil and gas reservoir artificial induction generation gas cap flooding method according to the present invention.
FIG. 4 is a schematic gas diffusion zone profile for a conventional artificial gas cap construction process.
FIG. 5 is a schematic diagram of gas diffusion zone distribution of a method for constructing an oil and gas reservoir to generate gas cap flooding by artificial induction according to an embodiment of the present invention.
Fig. 6 is a well location distribution diagram of the X1 block water flooding development scheme in example 1 of the present invention.
Fig. 7A is a plane oil saturation distribution diagram after the X1 block water flooding development in embodiment 1 of the present invention is completed.
Fig. 7B is a cross-sectional oil saturation profile after the water flooding development of the X1 block in example 1 of the present invention is completed.
FIG. 8 is a distribution diagram of the artificial gas cap obtained by building the X1 blocks in example 1 of the present invention.
FIG. 9 is a graph showing the distribution of the artificial gas cap obtained by constructing the X1 block in comparative example 1 of the present invention.
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.
In the manual gas cap oil displacement, gas is injected at a high-structure part, residual oil at the high-structure part is replaced to a low-structure part by utilizing the gravity differentiation formed by the density difference of oil and gas, a secondary gas cap is formed at the high-structure part, and the expansion energy of the secondary gas cap is utilized to exploit crude oil. In the early stage of the artificial gas cap drive, a secondary gas cap is formed at the high part of the structure by utilizing the gravity differentiation. At present, the common method for building artificial gas caps at home and abroad is as follows: and in the stage of artificially generating the gas cap, all production wells for constructing the high part of the oil and gas reservoir are firstly closed, then all or part of the production wells are selected to be converted into gas injection wells, the gas injection wells are closed after gas injection is finished, and the wells are stewed until the artificial gas cap is generated (a well arrangement schematic diagram of a conventional artificial gas cap construction method is shown in figure 2). Oil field development practices show that when the artificial gas cap is built by adopting a conventional method, the problems of low replacement efficiency of injected gas, long soaking time after gas injection, uneven front edge of the generated gas cap, difficult replacement of residual oil between wells and the like exist.
The reasons for the above problems are: according to the characteristics of artificial gas cap three-way seepage, injected gas enters the stratum and then moves to the high part and the low part of the structure at the same time as the injected gas moves to the two directions of the high part and the horizontal area of the structure. When the artificial gas cap is built by adopting a conventional method, on one hand, injected gas can be greatly transported downwards and enriched at the low and low parts in the structure under the action of the stratum pressure difference of the injection well at the high part and the production well at the low and low parts in the structure, so that the loss of the gas injection amount required for generating the artificial gas cap is large, and the gas injection efficiency is low; on the other hand, because the viscous resistance of crude oil is usually far greater than the gravity differentiation of oil and gas, the gravity differentiation is difficult to replace residual oil at a high structure part in a short period and form a secondary gas cap at the high structure part; thirdly, the influence of low gas injection efficiency and weak gravity differentiation results in longer well-stuffiness time and higher production cost for building the artificial gas cap. A schematic gas diffusion zone distribution for a conventional artificial gas cap construction method is shown in fig. 4.
In order to solve the problems, the invention provides the method for artificially inducing the formation of the gas cap oil displacement for the constructed oil and gas reservoir according to the three-way seepage characteristic of the artificial gas cap (after injected gas enters a stratum, the injected gas flows in three directions of a high-constructed part, a low-constructed part and a horizontal area).
Referring to fig. 1, a specific embodiment of the present invention provides a method for artificially inducing a constructed oil and gas reservoir to generate gas cap flooding, wherein the method includes:
step S1: in the stage of constructing the gas cap, converting part of production wells for constructing the high part of the oil and gas reservoir into gas injection wells for gas injection, and simultaneously continuing to produce the other production wells for constructing the oil and gas reservoir; monitoring the produced gas-oil ratio of a production well for constructing a high part of an oil-gas reservoir in real time;
step S2: gas is injected until the produced gas-oil ratio of a production well which is monitored to construct a high part of the oil-gas reservoir reaches a rated gas-oil ratio, and whether the injected gas amount is not less than a gas injection amount threshold value is judged;
and step S3: if the gas injection amount is not lower than the gas injection amount threshold value, closing a gas injection well for constructing the high part of the oil and gas reservoir and a production well for constructing the high part of the oil and gas reservoir to carry out soaking until a gas cap is generated; and if the gas injection amount is lower than the gas injection amount threshold value, the residual production wells at the high part of the constructed oil and gas reservoir are converted into gas injection wells for gas injection, and after the gas injection is finished, the gas injection wells at the high part of the constructed oil and gas reservoir and the production wells at the high part of the constructed oil and gas reservoir are closed for well soaking until a gas cap is generated.
In the embodiment, in the stage of constructing the gas cap, part of production wells for constructing the high part of the oil and gas reservoir are selected to be converted into gas injection wells, other production wells are still mined, and injected gas can move towards the three directions of the high part of the oil and gas reservoir, the low part of the oil and gas reservoir and a plane area between injection wells and production wells under the action of the production pressure difference between the gas injection wells and the production wells for constructing the high part of the oil and gas reservoir; when the produced gas-oil ratio of the constructed high-position production well reaches the rated gas-oil ratio, determining the follow-up operation according to the gas injection amount: if the gas injection amount is not lower than the gas injection amount threshold value, closing all wells at the high part of the constructed oil and gas reservoir, and stewing the wells until a gas cap is generated; if the injected gas quantity is lower than the gas injection quantity threshold value, other production wells at the high part of the structure are also converted into gas injection wells to continue gas injection, all wells at the high part of the oil and gas reservoir are closed after the gas injection is finished, and the wells are stewed until gas cap is generated.
In this embodiment, production wells are produced synchronously during gas injection, and the seepage of the injected gas in a certain direction is induced by increasing the seepage capability of the injected gas in the gas injection stage in the certain direction, so as to achieve the purpose of controlling the migration and enrichment of the injected gas in the direction beneficial to improving the gas injection efficiency, and a gas cap is generated by an artificial induction mode, and a well arrangement schematic diagram is shown in fig. 3.
In this embodiment, migration and enrichment of injected gas to the interpenetration well flat area is induced by constructing the production pressure differential between the high-profile gas injection and production wells without new well intervention. On one hand, the amount of the injected gas which is transported to and enriched at the low part in the structure can be greatly reduced, and the gas injection efficiency is improved; on the other hand, the flow capacity of residual oil between production wells at high positions of the structure can be improved, and the efficiency of injecting gas to replace the residual oil is improved; thirdly, based on the improvement of gas injection efficiency and replacement efficiency of injected gas, the well-closing time required by the construction of the artificial gas cap is shortened, and the production cost is further saved. The distribution schematic diagram of the gas diffusion zone in the above technical solution is shown in fig. 5.
Furthermore, the rated gasoline-oil ratio is the gasoline-oil ratio when a continuous gas diffusion zone is formed between injection wells and production wells at the high part of the constructed oil-gas reservoir;
the gasoline ratio when a continuous gas diffusion zone is formed between injection wells and production wells at the high part of the oil and gas reservoir can be determined by means of an oil and gas reservoir numerical simulation method;
furthermore, the rated gasoline ratio is 200-2000m 3 /m 3 ；
The injected gas is transported from the gas injection well to the production well under the action of production pressure difference, and because the gas density is far less than the crude oil density, the gas channeling can occur in the production well after the gas is continuously injected for a period of time; in the preferred embodiment, however, the production well is not shut in immediately after the gas breakthrough, but is shut in when a continuous gas diffusion zone can form between injection and production wells at a high location in the reservoir formation.
Further, the gas injection amount threshold is determined based on the design gas injection amount;
further, the gas injection amount threshold is not less than 0.1 times the design gas injection amount;
if the injected gas quantity is not lower than the gas injection quantity threshold value, the injected gas quantity is considered to meet the basic requirement of the secondary artificial gas cap scale on the gas quantity; if the injected gas quantity is lower than the gas injection quantity threshold value, the injected gas quantity is considered to be incapable of meeting the basic requirement of the secondary artificial gas cap scale on the gas quantity, and gas injection needs to be continued.
Further, the continuing production from the remaining production wells of the constructed hydrocarbon reservoir includes continuing production from a production well of the constructed hydrocarbon reservoir that is not converted into a gas injection well, continuing production from a middle production well of the constructed hydrocarbon reservoir, and continuing production from a lower production well of the constructed hydrocarbon reservoir.
Further, a mid-location of the formation reservoir refers to a portion of the formation reservoir having a depth of burial in the middle 1/3 segment.
Further, a low region of a formation reservoir refers to the portion of the 1/3 segment of the formation reservoir that is deepest.
Further, a high portion of a formation reservoir refers to the portion of the 1/3 segment of the formation reservoir that is shallowest in burial depth.
Further, the dip angle of the formation from which the reservoir is constructed is greater than 5 degrees.
The embodiment solves the problems of low gas injection efficiency, long soaking time, low replacement rate of injected gas and the like in the conventional method for building the artificial gas cap by constructing the gas reservoir through the method for generating the gas cap oil displacement through artificial induction by constructing the oil and gas reservoir, and has important theoretical and practical significance for improving the building efficiency of the artificial gas cap and effectively developing residual oil at the high part of the structure.
Example 1
The embodiment provides a method for reservoir oil displacement by gas cap generated by artificial induction of a constructed reservoir
The method is used for realizing the construction of the gas cap in the oil field fault block oil reservoir in the east of China.
In the initial stage of development, a water drive development mode is adopted, 2 oil wells P1 and P3 are distributed at the high part of the structure, 4 oil wells P2, P4, P5 and P6 are distributed at the middle part of the structure, 3 water wells W1, W2 and W3 are distributed at the low part and the side part of the structure, and the well positions are distributed as shown in figure 6. Through actual oil reservoir numerical simulation history fitting, the oil saturation distribution conditions of the plane and the section after the water drive development of the X1 block is finished are obtained, and as shown in fig. 7A and 7B, the residual oil distribution of the X1 block indicates that a large amount of residual oil exists in the high part of the structure.
The method for generating gas cap oil displacement by artificial induction of a constructed oil reservoir and generating the gas cap by artificial induction comprises the following specific steps:
step 1: selecting a P1 well with a high structure part to be converted into a gas injection well for gas injection, wherein the P3 well, the P2 well, the P4 well, the P5 well and the P6 well are still mined, and the water wells W1, W2 and W3 are continuously injected with water; monitoring the gas-oil ratio of the produced oil of a P3 well of a production well for constructing the high part of an oil reservoir in real time;
under the action of the production pressure difference of the gas injection well P1 and the production well P3, the injected gas can move to the plane area between the injection well and the production well P1 and P3 besides the high-structure part and the low-structure part.
Step 2: injecting gas until the gas-oil ratio of the produced gas-oil ratio of the production well at the high part of the oil reservoir to be constructed reaches 2000m 3 /m 3 Then judging whether the injected gas amount is not less than a gas injection amount threshold value;
the actual model optimization needs to consider the final development effect of the oil reservoir and also considers the objective conditions and economic cost of the mine construction. After X1 block oil reservoir numerical simulation optimization, a rated gas-oil ratio of 2000m is adopted 3 /m 3 As a control condition for P3 well shut-down; when the gas-oil ratio is 2000m 3 /m 3 When the gas diffusion zone is formed, a continuous gas diffusion zone is formed between injection wells and production wells at the high part of the oil reservoir.
And step S3: if the gas injection amount is not lower than the gas injection amount threshold value, closing a gas injection well at the high part of the constructed oil reservoir and a production well at the high part of the constructed oil reservoir for soaking (namely closing the P1 well and the P3 well, and continuing working of other wells) until a gas cap is generated; if the gas injection amount is lower than the gas injection amount threshold value, the rest production wells at the high part of the oil reservoir are converted into gas injection wells for gas injection (namely, the P3 well of the production well is converted into a gas injection well), after the gas injection is finished, the gas injection wells at the high part of the oil reservoir and the production wells at the high part of the oil reservoir are closed for soaking (namely, the P1 well and the P3 well are closed, and the rest wells continue to work) until gas cap is generated;
when the produced gas-oil ratio of the P3 well reaches the reference value of 2000m 3 /m 3 Then, the injected gas amount is larger than the gas injection amount threshold value, so that a gas injection well P1 and a production well P3 at the high part of the structure are closed, and the gas cap is generated after soaking for 3 months; in the soaking process, the P2 well, the P4 well, the P5 well, the P6 well, the W1 well, the W2 well and the W3 well continue to work;
in this example, the injection amount was designed to be 150X 10 4 m 3 (ii) a The threshold value of the gas injection amount was 150X 10 4 m 3 (ii) a When the produced gas-oil ratio of the P3 well reaches the reference value of 2000m 3 /m 3 After that, the injected gas amount was 170×10 4 m 3 。
The distribution of the artificial gas cap constructed in this example is shown in fig. 8.
Comparative example 1
The comparative example provides a conventional method for constructing an artificial gas cap of an oil reservoir, which is used for constructing the radial artificial gas cap of the oil reservoir in the embodiment 1 and specifically comprises the following steps:
converting the P1 well and the P3 well into gas injection wells for gas injection (the other wells continue to work), closing the P1 well and the P3 well when the gas injection amount reaches the designed gas injection amount, and stewing for 3 months; in the soaking process, the P2 well, the P4 well, the P5 well, the P6 well, the W1 well, the W2 well and the W3 well continue to work; the gas cap part is generated after 3 months of soaking.
The distribution of the artificial gas cap constructed in this comparative example is shown in fig. 9.
As can be seen from fig. 8 and 9, the artificial gas cap is constructed by the conventional method and the method provided by the present invention, and the distribution conditions of the constructed artificial gas cap are different. Although the conventional method has 2 wells for gas injection (P1 well and P3 well) in the stage of building the artificial gas cap, the situation that the built artificial gas cap is discontinuous and is enriched to the low part of the structure is serious; therefore, the gas injection efficiency is low, and the injected gas can not effectively replace the residual oil between the production wells at the high positions of the structure. The method provided by the invention only has 1 well for injecting gas (P1 well) in the stage of building the artificial gas cap, but the built artificial gas cap is stable and continuous, and the gas content of the high-structure part is high; therefore, the gas injection efficiency is high, and the injected gas can effectively replace most of the high-position area of the structure and the residual oil between production wells.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for generating gas cap oil displacement by artificial induction of a constructed oil and gas reservoir comprises the following steps:
in the stage of constructing the gas cap, converting part of production wells for constructing the high part of the oil and gas reservoir into gas injection wells for gas injection, and simultaneously continuing to produce the other production wells for constructing the oil and gas reservoir; monitoring the produced gas-oil ratio of a production well for constructing a high part of an oil-gas reservoir in real time;
gas is injected until the produced gas-oil ratio of a production well which constructs a high part of an oil-gas reservoir reaches a rated gas-oil ratio, and whether the injected gas amount is not lower than a gas injection amount threshold value is judged;
if the gas injection amount is not lower than the gas injection amount threshold value, closing a gas injection well for constructing the high part of the oil and gas reservoir and a production well for constructing the high part of the oil and gas reservoir for soaking until a gas cap is generated;
and if the gas injection amount is lower than the gas injection amount threshold value, the residual production wells at the high part of the constructed oil and gas reservoir are converted into gas injection wells for gas injection, and after the gas injection is finished, the gas injection wells at the high part of the constructed oil and gas reservoir and the production wells at the high part of the constructed oil and gas reservoir are closed for well soaking until a gas cap is generated.
2. The method of claim 1, wherein the nominal gas-to-oil ratio is a gas-to-oil ratio at which a continuous gas diffusion zone is formed between injection and production wells at a high location of the formation reservoir.
3. A method according to claim 2, wherein the nominal gas to oil ratio is 200-2000m 3 /m 3 。
4. The method of claim 1, wherein the insufflation amount threshold is determined based on a design insufflation amount.
5. The method of claim 4, wherein the gas injection quantity threshold is not less than 0.1 times the design gas injection quantity.
6. The method of claim 1 wherein continuing production from the remaining production wells of the formation comprises continuing production from production wells of the formation that are not converted into gas injection wells, continuing production from a central production well of the formation, and continuing production from a lower production well of the formation.
7. The method of claim 6, wherein the mid-location of the formation reservoir refers to a portion of the formation reservoir having a depth of burial in the middle 1/3 segment.
8. The method of claim 6, wherein the low site of the formation reservoir refers to a portion of the 1/3 segment of the formation reservoir having the deepest burial depth.
9. The method of claim 1, wherein the high portion of the formation reservoir refers to a portion of a 1/3 segment of the formation reservoir having the shallowest burial depth.
10. The method of any of claims 7-9, wherein the formation dip angle of the constructed reservoir is greater than 5 degrees.
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