CN107327288B - Gas injection oil well selecting method - Google Patents
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- CN107327288B CN107327288B CN201710545870.0A CN201710545870A CN107327288B CN 107327288 B CN107327288 B CN 107327288B CN 201710545870 A CN201710545870 A CN 201710545870A CN 107327288 B CN107327288 B CN 107327288B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention discloses a gas injection oil well selecting method, which comprises the following steps: selecting oil well gas injection effect influence factors, wherein the gas injection effect influence factors comprise a structure position, a reservoir type, a well-reservoir relation, a residual oil type, a reserve scale and a water content rising rule; and carrying out gas injection potential evaluation on each oil well in the mining area according to the structure position, the type of the reservoir, the well-reservoir relationship, the type of the residual oil, the reserve capacity scale and the water-containing ascending rule in sequence, thereby selecting the oil well for preferential gas injection. The gas injection oil well selecting method can quickly select the oil well with gas injection potential, so that the average oil increasing amount of a gas injection period is increased year by year, and at present, the average oil increasing amount of the gas injection period is greatly improved, and the gas injection effective rate can reach 96.1%. In general, the method greatly improves the effect of improving the recovery ratio by injecting gas into the ultra-deep fractured-vuggy reservoir, thereby greatly improving the production benefit.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a gas injection oil well selecting method.
Background
At present, gas injection is widely applied as a recovery factor technology for replacing water injection, but researches and applications mainly aim at sandstone reservoirs, and few reports exist at home and abroad aiming at researches and applications of the technology for improving the recovery factor by gas injection of the ultra-deep fractured-vuggy reservoir, and the technology for improving the recovery factor by gas injection of the ultra-deep fractured-vuggy reservoir in the Tahe oilfield has a remarkable effect, but because of the imperfect geological knowledge, the difficulties of fracture-vuggy delineation, description of well-vuggy relationship, residual oil distribution rule, well-bore and fracture-vuggy relationship and the like, a well selection method of a system is not formed, and the gas injection potential argumentation is insufficient. Therefore, the oil wells with potential for gas injection cannot be selected quickly, are laborious and difficult to perform, and have difficulty meeting the requirement of high recovery.
Disclosure of Invention
Therefore, the invention provides a gas injection well selection method which can quickly select the oil well with gas injection potential so as to greatly improve the oil and gas recovery rate, and solves the problems in the prior art.
The invention provides a gas injection oil well selecting method, which comprises the following steps:
selecting oil well gas injection effect influence factors, wherein the gas injection effect influence factors comprise a structure position, a reservoir type, a well-reservoir relation, a residual oil type, a reserve scale and a water content rising rule;
and carrying out gas injection potential evaluation on each oil well in the mining area according to the structure position, the type of the reservoir, the well-reservoir relationship, the type of the residual oil, the reserve capacity scale and the water-containing ascending rule in sequence, thereby selecting the oil well for preferential gas injection.
Preferably, when evaluating the gas injection potential of each oil well in the production zone through the formation location, the karst geological background of the oil well to be evaluated is first determined, and the order of the oil wells that are preferentially injected is determined according to the karst geological background.
Preferably, the order of the oil wells subjected to preferential gas injection is as follows: an oil well in a denuded zone of a weathering zone, an oil well in an exposed zone of a weathering zone, and an oil well in a coverage zone of a broken control karst zone.
Preferably, when evaluating the gas injection potential of each well in the production zone by the reservoir type, the karst geological background of the well to be evaluated is first determined,
ignoring the effect of the reservoir type on well selection if the oil well to be evaluated is in a weathered crust karst zone,
if the oil well to be evaluated is in a weathered crust karst zone, determining the sequence of the oil wells for preferential gas injection according to the reservoir type of the oil wells.
Preferably, the order of the oil wells subjected to preferential gas injection is as follows:
the method comprises the steps of directly drilling an oil well meeting a karst cave type reservoir type, a crack-hole type reservoir type oil well and an acid fracturing communication karst cave type reservoir type oil well.
Preferably, when the gas injection potential of each oil well in the production area is evaluated through the well-reservoir relationship, the well-reservoir relationship of the oil well to be evaluated is firstly judged, and the sequence of the oil wells for performing preferential gas injection is determined according to the well-reservoir relationship of the oil wells.
Preferably, the order of the wells subjected to preferential gas injection is:
preferably a middle production interval followed by an upper production interval followed by a lower production interval.
Preferably, when evaluating the gas injection potential of each oil well in the production zone by the remaining oil type, the remaining oil type of the oil well to be evaluated is first determined, and the order of the oil wells subjected to preferential gas injection is determined according to the remaining oil type of the oil well,
the sequence of the oil wells subjected to preferential gas injection is as follows:
in the weathering crust karst area, preferably the oil left in the upper part of the horizontal well, followed by the residual oil in the hills, followed by the bottom water channeling into the residual oil, and at worst the non-homogeneous strong residual oil,
in the fault control karst area, residual oil of a dump is preferably selected, then residual oil with strong heterogeneity is selected, and finally the type of residual oil mixed into the upper part and the bottom water of the horizontal well is selected.
Preferably, when the gas injection potential of each oil well in the production area is evaluated through the reserve size, the reserve size of the oil well to be evaluated is first determined, and the sequence of the oil wells for which gas injection is preferentially performed is determined according to the reserve size of the oil wells,
the sequence of the oil wells subjected to preferential gas injection is as follows:
and selecting gas injection oil wells in sequence according to the size of the reserve scale.
Preferably, when the gas injection potential of each oil well in the production area is evaluated through the water cut rising rule, the water cut rising rule of the oil well to be evaluated is firstly judged, the sequence of the oil wells which are subjected to preferential gas injection is determined according to the water cut rising rule of the oil wells,
the sequence of the oil wells subjected to preferential gas injection is as follows:
preferably, the oil well is of a stepped-up type, followed by a slow-rise type, followed by a fast-rise type, and finally a sudden-flooding type.
The gas injection oil well selecting method provided by the invention can quickly select the oil well with gas injection potential, so that the average oil increment in the gas injection period is increased year by year, and at present, the average oil increment in the gas injection period is greatly improved, and the gas injection effective rate can reach 96.1%. In general, the method greatly improves the effect of improving the recovery ratio by injecting gas into the ultra-deep fractured-vuggy reservoir, thereby greatly improving the production benefit.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 shows a flow chart of a gas injection well selection method according to an embodiment of the invention.
Fig. 2 shows a detailed flowchart of step S02) of the gas injection well selection method according to the embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The embodiment of the invention provides a gas injection oil well selecting method, which is used for quickly selecting an oil well with gas injection potential in an oil reservoir exploitation area so as to improve the exploitation recovery ratio of oil and gas. In this embodiment, the gas injected into the oil well is nitrogen, but may be other gases, such as a mixed gas of nitrogen and carbon dioxide. The well selection method is described in detail below by taking the gas injection well selection of the ultra-deep fracture-cavity type oil reservoir in the Tahe oil field as an example. As shown in fig. 1, the specific well selection method may refer to steps S01) -S02).
Table 1 shows the historical data for the gas injection well in the tahe oilfield. Analyzing the historical index data of the gas injection well of the Tahe oil field shows that: the average oil increase of the gas injection period is increased from 1250 tons to 1786 tons, and the gas injection effective rate is increased from 90.4 percent to 96.1 percent.
| Time (year) | Effective rate of gas injection (%) | Period average oil gain (t) |
| 2014 | 90.4 | 1250 |
| 2015 | 93.4 | 1435 |
| 2016 | 96.1 | 1786 |
TABLE 1 analysis table of historical index data of gas injection well in Tahe oil field
S01), selecting oil well gas injection effect influence factors, wherein the gas injection effect influence factors comprise a construction position, a reservoir type, a well-reservoir relation, a residual oil type, a reserve size and a water content rising rule.
Specifically, in this example, based on field test effect evaluation, the gas injection effect influencing factors are analyzed in terms of the formation location, the reservoir type, the distance from T74, the reserve size, the strength of energy, the water content rising characteristics, the type of residual oil, and the like under similar gas injection amounts by comparative analysis, and the most preferable well conditions under different influencing factors are obtained.
S02), and performing gas injection potential evaluation on each oil well in the mining area according to the construction position, the type of the reservoir, the well-storage relationship, the type of the residual oil, the reserve size and the water-containing ascending rule in sequence, so as to select the oil well for performing preferential gas injection.
As shown in fig. 2, this step in turn comprises steps S021) -S026):
s021), and performing gas injection potential evaluation well selection on each oil well in the production area through the construction position.
Specifically, when gas injection potential evaluation is performed on each oil well in the production zone through the formation location, the karst geological background of the oil well to be evaluated is first determined, and the order of the oil wells subjected to preferential gas injection is determined according to the karst geological background.
The surface karst development scale karst zone crack-hole type reservoirs in the denudation zone have better plane ductility, the coverage zone mainly develops the composite reservoirs formed along the fracture zone and the undercurrent corrosion zone cave type reservoirs, and the ductility and the scale are both smaller than those of the denudation zone, so the gas injection efficiency of the denudation zone is obviously better than that of the coverage zone. The sequence of the oil wells for preferential gas injection is as follows: an oil well in a denuded zone of a weathering zone, an oil well in an exposed zone of a weathering zone, and an oil well in a coverage zone of a broken control karst zone.
Thus, in this embodiment, the structure is preferably located in a room denuded zone of the weathering crust karst, a room exposed zone of the weathering crust karst, and then an upper austenite coverage zone of the control karst.
As shown in table 2, the field gas injection well effect statistics show that: one room denudation area has 43 wells, wherein 38 wells are available, the effective rate is 88 percent, and the average oil production per period is 1991 t; one room has 25 wells in the exposed area, wherein 22 wells are available, the effective rate is 88 percent, and the average oil production per period is 1466 t; the coverage area had 41 wells, of which 32 wells were available, the efficiency was 78%, and the cycle average oil production was 1036 t.
TABLE 2 statistical table of different karst geological background gas injection effects
S022), selecting wells for gas injection potential assessment of individual wells in the production zone by the reservoir type.
Specifically, when gas injection potential evaluation is performed on each well in the production zone by the reservoir type, the karst geological background of the well to be evaluated is first determined. And if the oil well to be evaluated is in the weathered crust karst area, neglecting the influence of the type of the reservoir on well selection, and if the oil well to be evaluated is in the weathered crust karst area, determining the sequence of the oil wells for performing preferential gas injection according to the type of the reservoir of the oil well.
The reservoir body of the weathering crust karst area has good associativity and large scale, and the type of the reservoir body is not a main control factor for increasing oil. The solution-cavity type reservoir body has large replacement space, is beneficial to the release of the elastic energy of nitrogen under the stratum condition, and has high longitudinal replacement efficiency; the acid fracturing indirect communication reservoir is relatively far, and the gas injection volume of a single well is smaller than the depletion of an oil well in the early stage or the large bottom water of an oil reservoir, so that the gas injection is fast in dissipation. The sequence of the oil wells for preferential gas injection is as follows: the method comprises the steps of directly drilling an oil well meeting a karst cave type reservoir type, a crack-hole type reservoir type oil well and an acid fracturing communication karst cave type reservoir type oil well.
Therefore, in the embodiment, on the types of reservoirs, the type of reservoirs in the litholytic zone of the weathering crust has little influence on the good and bad gas injection effect, the litholytic zone is controlled in a breaking mode, preferably, the reservoirs with obvious karst caves are directly drilled, then, fracture-hole type wells are selected, and acid-fracturing communication type reservoirs are selected later.
As shown in table 3, the field gas injection well effect statistics show that: the gas injection effect of different reservoir type wells in the weathering crust karst area is good, the karst area is controlled in a breaking way, 17 oil wells meeting the karst cave type reservoir are drilled directly, and 1383t of oil is produced in a single well period; 11 mouths of a crack-hole type oil well, and producing oil 922t in a single well period; oil 678t is produced per well cycle by acid fracturing 13 wells communicating with cavern type reservoirs.
TABLE 3 statistical tables of gas injection effectiveness for different reservoir types
S023) and performing gas injection potential evaluation and well selection on each oil well in the production area through the well storage relation.
Specifically, when gas injection potential evaluation is performed on each oil well in the production area through the well-reservoir relationship, the well-reservoir relationship of the oil well to be evaluated is determined first, and the sequence of the oil wells subjected to preferential gas injection is determined according to the well-reservoir relationship of the oil wells.
The middle well section is positioned on a surface karst zone, and the potential of the reservoir which is not used is larger along with the increase of the depth of the drilling in the reservoir; oil wells below 60m are dominated by subsurface flow, with reservoir volumes smaller than surface karsts. The sequence of the oil wells subjected to preferential gas injection is as follows: preferably a middle production interval followed by an upper portion followed by a lower portion.
Thus, in this embodiment, the well-reservoir relationship is preferably a middle production interval, followed by upper production, followed by lower. Wherein, the middle production well section is a well section at a position 30-60m away from the well mouth, and the upper production well section is a well section at a position 0-30m away from the well mouth.
As shown in table 4, the field gas injection well effect statistics show that: the gas injection effect of different reservoir type wells in the weathering crust karst area is good, the karst area is controlled in a breaking way, 17 oil wells meeting the karst cave type reservoir are drilled directly, and 1383t of oil is produced in a single well period; 11 mouths of a crack-hole type oil well, and producing oil 922t in a single well period; oil 678t is produced per well cycle by acid fracturing 13 wells communicating with cavern type reservoirs.
TABLE 4 statistical tables of gas injection effectiveness for different reservoir types
S024), and performing gas injection potential evaluation well selection on each oil well in the production area through the residual oil type.
Specifically, when gas injection potential evaluation is performed on each oil well in the production zone by the remaining oil type, the remaining oil type of the oil well to be evaluated is first determined, and the order of the oil wells subjected to preferential gas injection is determined according to the remaining oil type of the oil well.
The middle well section is positioned on a surface karst zone, and the potential of the reservoir which is not used is larger along with the increase of the depth of the drilling in the reservoir; oil wells below 60m are dominated by subsurface flow, with reservoir volumes smaller than surface karsts. The sequence of the oil wells subjected to preferential gas injection is as follows: in a weathering crust karst area, the residual oil at the upper part of a horizontal well is preferably selected, then the residual oil of a hillock is selected, then the residual oil is mixed into bottom water, and finally the residual oil with strong non-homogeneity is selected;
in the fault control karst area, residual oil of a dump is preferably selected, then residual oil with strong heterogeneity is selected, and finally the type of residual oil mixed into the upper part and the bottom water of the horizontal well is selected.
Thus, in this example, the type of residual oil, in the weathering crust karst zone, is preferably the upper residual oil of the horizontal well, followed by the residual hill residual oil, followed by the bottom water breakthrough residual oil, and, at worst, the non-homogeneous strong residual oil. In the fault control karst area, residual oil of a dump is preferably selected, then residual oil with strong heterogeneity is selected, and finally the type of residual oil entering from the upper part and the bottom water of the horizontal well is selected.
As shown in table 5, the field gas injection well effect statistics show that: in a weathering crust karst area, the average oil yield of the gas injection period of the residual oil and residual cumulus oil type well at the upper part of the horizontal well is higher than that of the residual oil type well with strong heterogeneity and bottom water flees into the residual oil type well; in the fault control karst area, the average oil content of the gas injection period of the residual oil and the residual oil type well with strong heterogeneity is high.
TABLE 5 statistical table of gas injection effect of different residual oil type wells
S025), gas injection potential assessment and well selection for each well in the production zone by the reserve size.
Specifically, when gas injection potential evaluation is performed on each oil well in the production zone by the reserve size, the reserve size of the oil well to be evaluated is first determined, and the order of the oil wells that are subjected to preferential gas injection is determined according to the reserve size of the oil wells.
For an oil reservoir with strong heterogeneity, the litholytic connectivity of the weathering crust is good, injected gas can drive crude oil in the fracture to a far end, the crude oil is not easy to be extracted, the reservoir body scale of the reservoir with the failure control karst formation factor is smaller than the reservoir body scale of the weathering crust formation factor, the boundary is obvious, and the injected gas can easily extract the crude oil in the fracture.
On the scale of reserves, the scale control of the reservoir body on the weathering crust karst area is obvious, and the larger the reservoir body scale is, the better the gas injection effect is. The sequence of the oil wells subjected to preferential gas injection is as follows: and selecting gas injection oil wells in sequence according to the size of the reserve scale. And preferably a control-breaking karst well, as opposed to weathered crust karsts.
S026), gas injection potential evaluation well selection is carried out on each oil well in the production area through the water content rising law.
Specifically, when the gas injection potential of each oil well in the production area is evaluated through the water cut rising rule, the water cut rising rule of the oil well to be evaluated is judged firstly, and the sequence of the oil wells for performing preferential gas injection is determined according to the water cut rising rule of the oil wells.
The oil well with water-containing step rising and slow rising has a plurality of sets of reservoirs, the communication degree of the reservoirs is greatly different, the residual oil is enriched, and the water-containing fast-rising and sudden-flooding type reservoirs are well communicated with bottom water, the water body energy is strong, and the gas injection replacement effect is poor. The sequence of the oil wells subjected to preferential gas injection is as follows: preferably, the oil well is of a stepped-up type, followed by a slow-rise type, followed by a fast-rise type, and finally a sudden-flooding type.
Therefore, in this embodiment, the water-cut rising type, preferably the step-up type, the slow-rise type, the fast-rise type, and the rapid-water-flooding type, are the least effective.
As shown in table 6, the field gas injection well effect statistics show that: the average oil production in the gas injection period of the well with water content in the weathering crust karst area and the breaking control karst area as the ascending steps is 3472t and 1302t respectively; the average oil production for the gas injection cycle for wells containing water that slowly rose was 2614t and 1302t, respectively.
TABLE 6 statistical table of gas injection effect of different water-bearing ascending well types
According to the gas injection oil well selecting method, the oil well with gas injection potential can be rapidly selected, so that the average oil increasing amount in a gas injection period is increased year by year, at present, the average oil increasing amount in the gas injection period is increased from 1250 tons to 1512 tons, and the gas injection effective rate is 96.1%. In general, the method greatly improves the effect of improving the recovery ratio by injecting gas into the ultra-deep fractured-vuggy reservoir, thereby greatly improving the production benefit.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A gas injection well selection method, comprising:
selecting oil well gas injection effect influence factors, wherein the gas injection effect influence factors comprise a structure position, a reservoir type, a well-reservoir relation, a residual oil type, a reserve scale and a water content rising rule;
gas injection potential evaluation is carried out on each oil well in the mining area according to the structure position, the type of the reservoir, the well-reservoir relationship, the type of the residual oil, the reserve capacity scale and the water-containing rising rule in sequence, so that the oil well which is subjected to preferential gas injection is selected;
when evaluating gas injection potential of each oil well in the production zone by the reservoir type, first determining a karst geological background of the oil well to be evaluated; determining the sequence of oil wells for preferential gas injection according to the karst geological background, and neglecting the influence of the type of the reservoir on well selection if the oil wells to be evaluated are in a weathered crust karst region; and if the oil well to be evaluated is in the fault control karst area, determining the sequence of the oil wells for performing preferential gas injection according to the reservoir type of the oil wells.
2. The gas injection well selection method of claim 1, wherein when evaluating gas injection potential of each well in the production zone by the formation location, first determining a karst geological background of the well to be evaluated and determining an order of wells for which gas injection is to be preferentially performed based on the karst geological background.
3. The gas injection well selection method of claim 2, wherein when evaluating the gas injection potential of each well in the production zone by the formation location, the order of preferentially injecting wells is, in order: an oil well in a denuded zone of a weathering zone, an oil well in an exposed zone of a weathering zone, and an oil well in a coverage zone of a broken control karst zone.
4. A gas injection well selection method as claimed in claim 1, wherein when assessing the potential for gas injection from each well in the production zone by the reservoir type, the order of the preferentially injected wells is in the order:
the method comprises the steps of directly drilling an oil well meeting a karst cave type reservoir type, a crack-hole type reservoir type oil well and an acid fracturing communication karst cave type reservoir type oil well.
5. The gas injection well selection method of claim 1, wherein when gas injection potential evaluation is performed on each well in the production zone through the well-reservoir relationship, the well-reservoir relationship of the well to be evaluated is first determined, and the order of wells for which gas injection is to be preferentially performed is determined according to the well-reservoir relationship of the wells.
6. The gas injection well selection method of claim 5, wherein when evaluating the gas injection potential of each well in the production zone by the well-reservoir relationship, the order of preferentially injecting wells is:
preferably a middle production interval followed by an upper production interval followed by a lower production interval.
7. The gas injection well selection method of claim 1, wherein when gas injection potential evaluation is performed on each well in the production zone by the remaining oil type, the remaining oil type of the well to be evaluated is first determined, and the order of the wells subjected to preferential gas injection is determined according to the remaining oil type of the well,
the sequence of the oil wells subjected to preferential gas injection is as follows:
in the weathering crust karst area, preferably the oil left in the upper part of the horizontal well, followed by the residual oil in the hills, followed by the bottom water channeling into the residual oil, and at worst the non-homogeneous strong residual oil,
in the fault control karst area, residual oil of a dump is preferably selected, then residual oil with strong heterogeneity is selected, and finally the type of residual oil mixed into the upper part and the bottom water of the horizontal well is selected.
8. The gas injection well selection method of claim 1, wherein when gas injection potential evaluation is performed on each well in the production zone by the reserve size, the reserve size of the well to be evaluated is first determined, and the order of wells that are preferentially injected is determined according to the reserve size of the wells,
the sequence of the oil wells subjected to preferential gas injection is as follows:
and selecting gas injection oil wells in sequence according to the size of the reserve scale.
9. The gas injection well selection method of claim 1, wherein when evaluating the gas injection potential of each well in the production zone by the water cut-up rule, the water cut-up rule of the well to be evaluated is first determined, and the order of the wells to be preferentially injected is determined according to the water cut-up rule of the wells,
the sequence of the oil wells subjected to preferential gas injection is as follows:
preferably, the oil well is of a stepped-up type, followed by a slow-rise type, followed by a fast-rise type, and finally a sudden-flooding type.
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| CN110984971B (en) * | 2019-10-14 | 2023-06-02 | 中国石油天然气股份有限公司 | Microscopic residual oil classification method based on formation mechanism analysis |
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