CN111322054A - Three-three combined excavation and potential optimization mining method for sandstone oil reservoir in chemical flooding stage - Google Patents
Three-three combined excavation and potential optimization mining method for sandstone oil reservoir in chemical flooding stage Download PDFInfo
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- CN111322054A CN111322054A CN201811541449.3A CN201811541449A CN111322054A CN 111322054 A CN111322054 A CN 111322054A CN 201811541449 A CN201811541449 A CN 201811541449A CN 111322054 A CN111322054 A CN 111322054A
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- well
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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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses a three-three combined excavation and potential optimization mining method of a sandstone reservoir in a chemical flooding stage. The method comprises the following steps: 1) determining three-three combined diving positions: determining three-three combined excavation and submerging wells at the positions of the anti-nine-point side wells in the five-point method area well pattern; 2) determining the three-three combined diving entry time: injecting the chemical flooding solution into a submergible well with PV number of 0.2-0.6PV to enter a chemical flooding layer for submerging; 3) determining the ending time of the three-three combined excavation: and the three-combined excavation and submergence well enters a high water-cut period, the excavation and submergence are finished, and other strata are upwards returned. The optimized exploitation method can improve the oil layer exploitation effect and improve the chemical flooding technology and economic indexes.
Description
Technical Field
The invention belongs to the technical field of oil reservoir development, and particularly relates to a three-three combined excavation and potential optimization mining method for a sandstone oil reservoir in a chemical flooding stage.
Background
In China, most of thin oil, high-condensation oil and high-water-permeability flooding sandstone reservoirs enter the middle and later stages of the water flooding development stage of oil fields with high water content and high production degree, taking Liaohe oil fields as an example, by 2017, the average recoverable reserve production degree is 93.7 percent, the average comprehensive water content is 87.3 percent, the continuous water flooding potential is very limited, and the conversion of the development mode to carry out tertiary oil recovery is very urgent. The tertiary oil recovery is oil recovery by means of chemistry, physics, biology and the like, the recovery ratio can be improved by about 6-20%, four technical series of the tertiary oil recovery are formed in the world at present, including chemical flooding, gas flooding, thermal flooding and microbial flooding, and the most applicable technology of the tertiary oil recovery of the high-permeability sandstone oil reservoir in the thin oil and the high-setting oil is the chemical flooding technology.
In recent years, chemical flooding is applied to the practice of mines in various oil fields such as Daqing, Shengli, Liaohe, Jilin, Xinjiang, Hongkong and the like, the recovery rate of crude oil is improved to a certain extent, for example, the recovery rate of 16 Xinglong platform oil layer polymer surface composite flooding industrial tests of Liaohe oil field is 65.5% in 8 months and the recovery rate of chemical flooding is estimated to be improved by 19%.
The chemical flooding blocks of the oil field in China mostly adopt five-point method area well patterns, and numerical simulation also proves that under the same well pattern density, the five-point method area well pattern technology and economic indexes are superior to those of other well pattern types, however, even if chemical flooding is utilized, under the condition of improving the flow rate of the displacement fluid, the five-point method area well pattern still forms a part which cannot be reached by the displacement fluid on a plane, so that the three-three combined excavation and submergence optimizing mining method for the chemical flooding stage of the sandstone reservoir is provided, the area sweep coefficient can be further expanded, more oil is extracted at the early stage of the chemical flooding stage, and the economic indexes such as the chemical flooding recovery rate and the internal yield rate are improved.
Disclosure of Invention
The invention particularly relates to a three-three combined excavation and potential optimization mining method of a sandstone reservoir in a chemical flooding stage. The invention improves the development effect of the three-three combined excavation and submergence by optimizing the position of the three-three combined excavation and submergence, the time of ending the three-three combined excavation and submergence, realizes the maximization of economic indexes such as the improvement of recovery ratio and internal yield of chemical flooding, and the like, and is a method for exploiting the sandstone reservoir by using old wells or chemical flooding new wells in the chemical flooding development stage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-three combined excavation and potential optimization mining method for a sandstone reservoir in a chemical flooding stage comprises the following steps:
1) determining three-three combined diving positions: determining three-three combined excavation and submerging wells at the positions of the anti-nine-point side wells in the five-point method area well pattern;
2) determining the three-three combined diving entry time: injecting the chemical flooding solution into a submergible well with PV number of 0.2-0.6PV to enter a chemical flooding layer for submerging;
3) determining the ending time of the three-three combined excavation: and the three-combined excavation and submergence well enters a high water-cut period, the excavation and submergence are finished, and other strata are upwards returned.
The submerged wells are all oil production wells, the submerged wells are additionally arranged on the basis of a five-point method area well pattern, and crude oil gathered by chemical flooding displacement is produced; the chemical flooding solution is injected through an injection well.
The following is a description of specific steps:
step 1): determining three-three combined diving positions: and determining three-three combined excavation and submerging wells at the positions of the anti-nine-point side wells in the five-point method area well pattern.
According to the digital-analog research and the actual production condition of a mine field, the potential digging effect is better when the three-three combination is determined to be at the position of the side well with the reverse nine points in the five-point method area well pattern. The appropriate submergence location is determined and then it is determined whether there is an appropriate well for submerging at that location. The position of the anti-nine-point side well in the five-point method area well pattern is not necessarily the point, namely the middle position of the side length of the square in the five-point method, when the proper position is actually determined, the submersible well is actually determined by combining the distribution condition of each well in the well group, and the proper well near the anti-nine-point side well position can be used as the submersible well.
In the invention, the five-point method area well pattern is an injection-production well pattern type adopted by a chemical flooding target layer.
The anti-nine-point side well position is the middle position of the injection in the south and north or the mining in the south and north in the five-point method area well pattern of the chemical flooding target layer, as shown in figure 1. FIG. 1 is a five-point method area well pattern with a water well as the center, wherein four corners are oil production wells, the middle is an injection well, and the side length middle of a square is at an inverted nine-point position.
Specifically, old wells, low-yield oil wells or other chemical drive wells of the stratum system which are not used can be used as three-three combined excavation and submergence wells.
In the invention, the unused old well refers to a well which is not used any more in other water-flooding intervals or chemical flooding target layers in the same block, such as a geological abandoned well, an observation well, an inspection well, a monitoring well and the like.
In the invention, when the other layer chemical flooding well is a multi-layer chemical flooding well containing two or more water in a block, if the two-layer chemical flooding is performed first, the chemical flooding well of the one-layer chemical flooding well is drilled only at the stage of performing chemical flooding on the two-layer chemical flooding, and the one-layer chemical flooding well does not have chemical flooding formal injection conditions, the chemical flooding well of the two-layer chemical flooding well can enter the two-layer chemical flooding layer at a proper position and at a proper time to perform three-three combined excavation (fig. 2). FIG. 2 is a schematic diagram of two sets of layer system injection and production well patterns of the chemical flooding, wherein a well A is a layer system production well and is also an inverse nine-point position in a two-layer system area well pattern; the well B is a two-layer oil production well and is also at the position of an opposite nine point in a one-layer area well pattern. Step 2): determining the three-three combined diving entry time: injecting chemical flooding solution into three-three combined potential digging wells with PV number determined between 0.2-0.6PV to enter chemical flooding positions for potential digging.
According to the digital-analog research and the actual production condition of a mine field, the three-three combination is determined to be at a suitable position for excavation, namely the determined three-three combination excavation well, the number of injected PV of the chemical flooding solution is 0.2-0.6PV, the chemical flooding solution enters a chemical flooding layer for excavation, and the excavation effect is good.
In the invention, the injection PV number refers to the ratio of the total injection amount of the chemical flooding solution of a chemical flooding target layer to the total pore volume of the chemical flooding target layer, and also refers to the ratio of the total injection amount of the chemical flooding solution of a certain well group to the total pore volume in a well group control range, according to the digital analog research, the optimal entering time of the three-three combination is the injection PV number between 0.2 and 0.6PV, as shown in figure 3, in the reverse nine-point position of a five-point method well pattern, along with the process of oil wall migration, the process of increasing saturation firstly and then decreasing exists; the saturation on the injection-production connecting line is always reduced. Production and digital-analog researches show that well point production effect is better when the position of the reverse nine points is increased before the peak of effectiveness (before PV number is injected to be 0.6 PV).
Step 3): determining the ending time of the three-three combined excavation: and the three-combined excavation and submergence well enters a high water-cut period, the excavation and submergence are finished, and other strata are upwards returned.
In the invention, the high water cut period means that the water content of the three-three combined excavation and submergence well reaches more than 95%, the daily oil production is less than 1t, and the three-three combined excavation and submergence can be considered to be finished.
The sandstone reservoir chemical flooding stage three-three combined excavation and potential optimization method provided by the invention is suitable for exploiting the layered sandstone reservoir developed by high-permeability water flooding in thin oil and high-pour-point oil, and the recovery ratio of the sandstone reservoir chemical flooding stage can be improved by the method provided by the invention.
The exploitation method provided by the invention fully depends on the chemical flooding displacement migration rule, solves the problem that the dead oil area in the chemical flooding five-point method area well pattern causes the restriction of the chemical flooding technology and the economic index through the optimization design, further expands the area sweep coefficient, and produces more oil in the early stage of the chemical flooding stage, thereby improving the economic indexes such as the chemical flooding recovery rate and the internal yield.
Drawings
FIG. 1 is a schematic diagram of the position of the anti-nine point in a five-point area well pattern.
FIG. 2 is a schematic diagram of two sets of layer injection and production patterns for chemical flooding.
FIG. 3 is a schematic diagram of the optimal time for the three-in-three combination diving of the present invention.
FIG. 4 is a schematic diagram of three-in-three mining potential combination of a north mining well and a south mining well in the embodiment of the invention.
FIG. 5 is a J2-7-116C well production curve in accordance with an example of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
A certain layer of J16 Xinglong platform oil layers are selected in the Liaohe oil field to carry out a polymer flooding combined flooding industrial test, 24-injection 35-production is designed in a test area, the reserve is 298 million tons, the oil is formally injected into a chemical flooding front slug in 2011 and is transferred into a main slug in 2011 and 12 months, and the chemical flooding effect is further improved by increasing oil production well points in the main slug stage. Selecting a typical well group 7-A227 to carry out three-three combined excavation and potential optimization, wherein the three-three combined excavation and potential optimization comprises the following steps:
(1) selecting available 7-116C wells in the well group, locating near the middle position of the north-south mining interval, and injecting a horizon II for the 7-A227 wells8And III1Three-three combined dives were performed (fig. 4).
(2) Injection well 7-A227 well level II in a well group87-116C into horizon II at an injected PV number of 0.28PV8The excavation is carried out, and oil 1605.9t is produced in a cumulated mode.
(3)7-116C at horizon II8When the medium potential effect is poor, the daily oil production is less than 1t and the water content is more than 95 percent, ending the horizon II8Digging and submerging.
(4) Injection well 7-A227 well horizon III in a well group17-116C into horizon III at an injection PV number of 0.19PV1-2And (5) carrying out excavation, and accumulating oil 2924 t.
(5)7-116C at horizon III1-2When the medium excavation potential effect is poor, the daily oil production is less than 1t and the water content is more than 95 percent, ending the horizon III1-2Digging and submerging.
(6)7-116C, after more than 3 years of three-three combined dredging, the accumulated oil reaches 4529.9t, and the production curve is shown in figure 5. Injecting a well 7-A227 in the well group in the step (2)87-116C into horizon II at an injected PV number of 0.28PV8And (4) carrying out excavation, wherein 7.7t/d of oil is produced daily in the initial stage, the water content is 77.1 percent, and 1605.9t is produced cumulatively in the stage. Injecting well 7-A227 well horizon III in the well group by step (4)17-116C into horizon III at an injection PV number of 0.19PV1-2And (4) carrying out excavation, wherein daily oil yield is 8.7t/d at the initial stage, water content is 66.2%, and oil yield is 2924t cumulatively at the stage.
The above example is only an example of one three-three combined excavation well in an industrial test area, and the three-three combined excavation is carried out on 21 wells in the test area, and by the end of 2017.11 months, the three-three combined excavation well can accumulate 3.3 ten thousand tons of oil, and the net present value of the financial affairs is increased by 2780 ten thousand yuan compared with the case of not carrying out the three-three combined excavation. The embodiment shows that the chemical flooding stage three-three combined excavation and potential optimization method for the sandstone reservoir can improve the oil layer development effect and improve the chemical flooding technology and economic indexes.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. A three-three combined excavation and potential optimization mining method for a sandstone reservoir in a chemical flooding stage is characterized by comprising the following steps:
1) determining three-three combined diving positions: determining three-three combined excavation and submerging wells at the positions of the anti-nine-point side wells in the five-point method area well pattern;
2) determining the three-three combined diving entry time: injecting the chemical flooding solution into a submergible well with PV number of 0.2-0.6PV to enter a chemical flooding layer for submerging;
3) determining the ending time of the three-three combined excavation: and the three-combined excavation and submergence well enters a high water-cut period, the excavation and submergence are finished, and other strata are upwards returned.
2. The triple-combination excavation and potential optimization mining method according to claim 1, wherein the five-point method area well pattern is an injection-production well pattern type adopted by a chemical flooding target stratum.
3. The three-in-three combined excavation and diving optimized mining method as claimed in claim 2, wherein the anti-nine-point side well position is a central position of north-south injection or south-north mining in a five-point area well pattern of a chemical flooding target zone.
4. The triple-combination excavation and submergence optimized production method according to claim 3, wherein the triple-combination excavation and submergence well is an unused old well, a low-yield oil well or other bed chemical drive new well.
5. The three-in-three combined mining and diving optimization production method as claimed in claim 4, wherein the unused old well is a well which is not used any more in other water-drive intervals or chemical-drive target zones in the same block, and comprises a geological abandonment well, an observation well, an inspection well and a monitoring well.
6. The triple-combination excavation and potential optimization mining method according to claim 1, wherein the injection PV number is a ratio of a total injection amount of chemical flooding solution of a chemical flooding target layer to a total pore volume of the chemical flooding target layer.
7. The optimal mining method for triple-combined excavation and submergence as claimed in claim 1, wherein the high water cut period means that the water content of the triple-combined excavation and submergence well reaches more than 95%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112727413A (en) * | 2021-01-09 | 2021-04-30 | 西南石油大学 | Oil extraction method combining fine water injection and chemical combination flooding of complex fault block oil reservoir |
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