Tracking and adjusting chart and method for injection and production wells in polymer flooding water-containing decline period of three types of oil layers

Abstract

The invention discloses an injection-production well tracking adjustment chart and method in the polymer flooding water drop period of three types of oil layers. The injection-production well tracking adjustment chart comprises an injection well adjustment chart and a production well adjustment chart. The injection well adjustment chart is based on a first rectangular area formed by taking a set injection well specific liquid absorption index range as the length and taking a set injection well oil layer production thickness proportion range as the width, and the first rectangular area is divided into a fracturing transformation area, a concentration area and a reasonable area; the production well adjustment chart is based on a second rectangular area formed by taking a set flow pressure range of the production well as the length and taking a set oil layer production thickness proportion range of an injection well communicated with the production well as the width, and the second rectangular area is divided into a decreasing parameter adjustment area, an increasing parameter adjustment area and a reasonable area; the problem that no corresponding adjusting technology is provided for tracking and adjusting injection-production wells in the polymer flooding water drop period of three types of oil layers is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tertiary oil recovery for three types of oil layers, and in particular to a method for tracking and adjusting injection and production wells in a polymer flooding water-cut decline period for three types of oil layers. Background Art

[0002] According to the evolution of polymer flooding well network in Daqing Oilfield, polymer flooding was first carried out in Class I oil layers, and then in other oil layers. With the continuous promotion of industrialization of Class I oil layers, polymer flooding tracking and adjustment technology has been continuously improved and optimized, and a polymer flooding matching adjustment technology suitable for Class I oil layers has been formed. At the same time, the remaining reserves of Class I oil layers are decreasing year by year. In order to achieve production succession, the future polymer flooding exploitation targets will be transformed from Class I oil layers to Class III oil layers.

[0003] From the perspective of sedimentation, there are significant differences between the first and third oil layers. First, the sedimentary environment is significantly different. The first oil layer is mainly composed of delta distributary plain phase sand bodies and delta inner front phase sand bodies. On the plane, river channel sand is developed over a large area, with high drilling rate, large effective thickness, high permeability, and relatively large pore throat radius. The system suitable for injection is a combination of high-fraction and ultra-high-fraction polymers and a high-fraction followed by salt-resistant injection system. The third oil layer belongs to the delta inner front phase sand body and delta outer front phase sand body deposition. On the plane, the river channel sand is narrow and has a low drilling rate. Inter-river sand and surface sand are developed over a large area. On the plane, the continuity of the sand body is relatively poor, the pore throat diameter is relatively small, the number of developed oil layers is large, but the effective thickness is small, the permeability is low, and the interlayer difference is obvious. The field test of polymer flooding of the third oil layer has shown that the third oil layer is suitable for injection of low-fraction and ultra-low-fraction polymer systems.

[0004] Since the sedimentary environment, reservoir development and injection system of Class I and Class III oil layers are significantly different, the relatively complete polymer flooding water-cut decline period tracking and adjustment technology achieved for Class I oil layers is not suitable for polymer flooding water-cut decline period tracking and adjustment for Class III oil layers, and there is no effective technology to match it for polymer flooding water-cut decline period tracking and adjustment for Class III oil layers. Summary of the invention

[0005] In view of this, the present disclosure provides a tracking and adjustment chart for injection and production wells in the three types of oil layers during the period of water cut decline in polymer flooding, so as to solve the problem that there is no corresponding adjustment technology for tracking and adjusting injection and production wells in the three types of oil layers during the period of water cut decline in polymer flooding.

[0006] In addition, the present disclosure also provides a method for tracking and adjusting injection and production wells in the water-cut decline period of three types of oil layers during polymer flooding.

[0007] In the first aspect, the tracking adjustment chart of injection and production wells in the water-cut decline period of the three types of oil layers in polymer flooding includes:

[0008] Injection well adjustment chart and production well adjustment chart;

[0009] The injection well adjustment chart is based on a first rectangular area formed by setting the injection well specific liquid absorption index range as the length and the injection well oil layer production thickness ratio range as the width, and the specific liquid absorption index range and the oil layer production thickness ratio range are respectively divided and combined to divide the first rectangular area into a fracturing transformation area, a concentration improvement area and a reasonable area;

[0010] The production well adjustment chart is based on a second rectangular area formed by a set production well flow pressure range as the length and a set injection well oil layer production thickness ratio range connected to the production well as the width. The production well flow pressure range and the injection well oil layer production thickness ratio range connected to the production well are divided and combined respectively, and the second rectangular area is divided into a small adjustment area, a large adjustment area and a reasonable area.

[0011] In the present disclosure and possible embodiments, the length range of the first rectangular area is 0m 3 / dmMPa~1.5m 3 / dmMPa, the width range is 0% to 100%; in the first rectangular area, the length range is 0m 3 / dmMPa~0.5m 3 / dmMPa, width range is 0% to 50%, the rectangular range is the fracturing transformation area; length range is 0m 3 / dmMPa~1.5m 3 / dmMPa, the width range is 0% to 70% of the area minus the range of the fracturing transformation area is the concentration area; the length range is 0m 3 / dmMPa~1.5m 3 / dmMPa, and the rectangular range with a width of 70% to 100% is the reasonable area.

[0012] In the present disclosure and possible embodiments, the length range of the second rectangular area is 0-8.0MPa, and the width range is 0-100%; within the second rectangular area, the rectangular range with a length range of 0-2.5MPa and a width range of 0-80% is the reduced parameter area; the rectangular range with a length range of 5.0MPa-8.0MPa and a width range of 0%-80% is the increased parameter area; the rectangular area with a length range of 0-8.0MPa and a width range of 0%-100% minus the reduced parameter area and the increased parameter area is the reasonable area.

[0013] In the present disclosure and possible embodiments, the calculation formula for the production thickness ratio of the injection well oil layer is:

[0014] H=h in / hoe ;

[0015] Where: H-proportion of oil layer producing thickness, %; h in - Liquid absorption thickness, m; h oe -Effective thickness, m.

[0016] In the second aspect, the method for tracking and adjusting injection and production wells in the three types of oil layers during the water cut decline period of polymer flooding comprises:

[0017] According to the apparent liquid absorption index of the injection well and the ratio of the oil layer production thickness, the area where the injection well falls is determined on the injection well adjustment chart of the first aspect; the injection wells falling into the fracturing transformation area and the concentration zone are subjected to fracturing transformation treatment or injection concentration increase treatment; the injection wells falling on the common boundary of the fracturing transformation area and the concentration zone are subjected to fracturing transformation treatment; the injection wells falling into the reasonable area and its own boundary are not adjusted; the injection wells falling on the common boundary of the reasonable area and the concentration zone are subjected to injection concentration increase treatment;

[0018] According to the ratio of the utilized thickness of the oil layer connecting the production well to the injection well and the flow pressure of the well, the area where the production well falls is determined on the production well adjustment chart described in any one of claims 1 to 4; the production parameters of the production wells falling into the reduced parameter area and on its boundary are reduced, the production parameters of the production wells falling into the increased parameter area and on its boundary are increased, and the production wells falling into the reasonable area and its own boundary are not adjusted.

[0019] In the present disclosure and possible embodiments, the production parameter is stroke, stroke frequency or pump diameter.

[0020] The present disclosure has the following beneficial effects:

[0021] The disclosed chart and method for tracking and adjusting injection and production wells in the period of water cut decline in polymer flooding of three types of oil layers are developed based on field tests of three types of oil layers under the condition of injecting a low-fraction polymer clear and dilute system, and are used to guide the tracking and adjustment of injection and production wells in the period of water cut decline in polymer flooding of three types of oil layers. Application results show that through timely tracking and adjustment of injection and production wells, the utilization thickness of oil layers in the study area is significantly improved, oil production is significantly increased and water reduction is significantly reduced in production wells, and better polymer flooding development effects are achieved, effectively solving the problem of lack of corresponding adjustment technology for tracking and adjustment of polymer flooding of three types of oil layers in the period of water cut decline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0023] Figure 1It is a tracking adjustment chart of injection wells in the water-cut decline period of three types of oil layers in polymer flooding according to an embodiment of the present disclosure;

[0024] Figure 2 This is a chart for tracking and adjusting production wells in the water-cut decline period of three types of oil layers in polymer flooding according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts that are not described in detail, those skilled in the art can also fully understand the present disclosure.

[0026] In addition, those skilled in the art should understand that the drawings are provided only to illustrate the purpose, features and advantages of the present disclosure, and the drawings are not actually drawn to scale. At the same time, unless the context clearly requires, the words "include", "comprise" and the like in the entire specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, "including but not limited to" meaning.

[0027] For tracking and adjusting injection and production wells during the decline of water cut in three types of oil layers during polymer flooding, the embodiment of the present disclosure uses a tracking and adjustment chart for injection and production wells during the decline of water cut in three types of oil layers during polymer flooding. The adjustment chart is divided into an injection well adjustment chart and a production well adjustment chart. The establishment of the two charts and the method for tracking and adjusting based on the above charts are as follows:

[0028] (1) Establishment of injection well adjustment chart and tracking adjustment method

[0029] Depend on Figure 1 As shown: The specific liquid absorption index of the injection well is the length of the rectangle, the length range is from 0-1.5, the unit is m 3 / dmMPa, with the injection well oil layer production thickness ratio as the rectangle width, the length range is from 0-100, the unit is %, forming a rectangular plate, which is divided into three areas on the plate, with the long side range of 0m 3 / dmMPa-0.5m 3 / dmMPa, the rectangular area with a width range of 0%-50% is the fracturing transformation area, and the injection wells in the fracturing transformation area are subjected to fracturing treatment; the length range is 0m 3 / dmMPa~1.5m 3 / dmMPa, the rectangular area with a width range of 0% to 70% minus the range of the fracturing transformation area is the concentration zone, and the injection wells in the concentration zone are subjected to injection concentration increase treatment; the injection wells on the common boundary of the fracturing transformation area and the concentration zone are subjected to fracturing transformation treatment; the long side range is 0m 3 / dmMPa-1.5m 3 / dmMPa, the rectangular area formed by the wide side range of 70%-100% is the reasonable area. The current injection parameters of the injection wells in the reasonable area and on the boundary of the reasonable area are maintained without adjustment; the injection concentration of the injection wells on the common boundary of the reasonable area and the concentration area is increased.

[0030] (2) Establishment of the adjustment chart of the production well and the tracking adjustment method

[0031] Depend on Figure 2 As shown in the figure: the production well flow pressure is the length of the rectangle, the length range is from 0-8.0, the unit is MPa, the production well connected to the injection well oil layer production thickness ratio is the width of the rectangle, the length range is from 0-100, the unit is %, forming a rectangular plate, there are three areas on the plate, among which the rectangular area with a long side range of 0MPa-2.5MPa and a wide side range of 0%-80% is the adjustment reduction area, and the production parameters (stroke, stroke frequency, pump diameter) of the production wells in the adjustment reduction area and on its boundary are adjusted down; the rectangular area with a long side range of 0MPa-2.5MPa and a wide side range of 0%-80% is the adjustment reduction area. The rectangular area formed by 5.0MPa-8.0MPa and a width range of 0%-80% is the enlarged parameter area. The production parameters (stroke, stroke frequency, pump diameter) of the production wells in the enlarged parameter area and on its boundary are enlarged; the rectangular area with a length range of 0MPa~8.0MPa and a width range of 0~100% minus the reduced parameter area and the enlarged parameter area is the reasonable area. The current production parameters of the production wells in the reasonable area and on its own boundary are maintained without adjustment, but real-time tracking and adjustment are required according to the development situation.

[0032] The disclosed embodiment uses the above adjustment chart and tracking adjustment method to apply to the three types of oil layer return test area in Area X. There are 14 injection wells and 21 production wells in the whole area. The test area started polymer flooding in February 2020. After 4 months of polymer injection, the test area entered the water cut decline period. The injection well adjustment chart was used to guide the injection well concentration increase 10 wells and fracturing 4 wells; the production well adjustment chart was used to guide the production well to adjust the large parameter 9 wells and the small parameter 9 wells. The specific process is as follows:

[0033] (1) Use the injection well adjustment chart to guide the injection well tracking adjustment in the test area:

[0034] ① Tracking adjustment of injection well A in the fracturing area:

[0035] Basic information of Well A: effective thickness 3.6m, injection pressure 12.0MPa, daily injection volume 20m 3 , injection concentration 391mg / L, specific absorption index 0.46m 3 / dmMPa, the liquid absorption thickness is 1.0m, substitute it into the following formula to calculate the production thickness ratio of the oil layer in Well A:

[0036] H=h in / h oe ;

[0037] Where: H-proportion of oil layer producing thickness, %; h in - Liquid absorption thickness, m; h oe -Effective thickness, m.

[0038] Using the above formula, the oil layer production thickness ratio of Well A is 27.78%. According to the oil layer production thickness ratio and the specific liquid absorption index, Figure 1 On the injection well adjustment chart shown, the area where well A is located is found to be the fracturing transformation area, and the well is subjected to fracturing transformation according to conventional technical means in this field.

[0039] Compared with before fracturing, the injection pressure of Well A dropped from 12.0MPa to 6.0MPa, and the daily injection volume increased from 20m 3 Increase to 40m 3 The injection concentration increased from 391 mg / L to 1456 mg / L, and the specific absorption index increased from 0.46 mg / L to 1456 mg / L. 3 / dmMPa increased to 1.39m 3 / dmMPa, the oil layer production thickness ratio increased from 27.78% to 100%. The area in the chart was found according to the oil layer production thickness ratio and the specific liquid absorption index of Well A after fracturing. The results showed that Well A was in a reasonable area after fracturing.

[0040] By using the tracking adjustment method and tracking adjustment chart of the embodiment of the present disclosure, during the period of water cut decline in the test area, according to the injection well adjustment chart, a total of 4 injection wells in the fracturing area were fractured. After fracturing, a good fracturing effect was achieved. Compared with before fracturing, the average single well injection pressure decreased by 4.8 MPa, and the daily injection volume increased by 75m 3 , the liquid absorption index is from 0.29m 3 / dmMPa increased to 1.00m 3 / dmMPa, the oil layer production thickness ratio increased from 33.95% to 85.61%. According to the specific liquid absorption index and oil layer production thickness ratio after fracturing of the injection well, the injection well adjustment chart was compared. The results show that the four fracturing wells are all in the reasonable area. For details, see Table 1 and Table 2:

[0041] Table 1 Statistics of basic conditions of fracturing injection wells in the study area

[0042]

[0043] Table 2 Statistics of injection well fracturing effects before and after fracturing in the study area

[0044]

[0045]

[0046] ② Tracking adjustment of injection well B in the concentration area:

[0047] Basic information of Well B: effective thickness 9.3m, injection pressure 9.9MPa, daily injection volume 50m 3 , injection concentration 1165mg / L, specific absorption index 0.54m 3 / dmMPa, the liquid absorption thickness is 5.1m, and the oil layer utilization thickness ratio of this well is calculated according to the formula to be 54.84%. According to the oil layer utilization thickness ratio and the specific liquid absorption index, the area where well B is located is found as the concentration improvement area on the injection well adjustment chart, and the injection concentration of this well is increased according to the conventional technical means in this field.

[0048] Compared with before the adjustment, the injection pressure of Well B increased from 9.9MPa to 10.6MPa, and the daily injection volume remained at 50m 3 The injection concentration increased from 1165mg / L to 1586mg / L, and the proportion of oil layer utilization thickness increased from 54.84% to 90.32%, an increase of 35.48 percentage points.

[0049] By using the tracking adjustment method and tracking adjustment chart of the embodiment of the present disclosure, in the test area, the injection concentration of the injection wells in the concentration zone was adjusted upward according to the injection well adjustment chart during the water cut decline period. A total of 10 wells were adjusted. Before the adjustment, the average single well injection pressure was 9.2 MPa, the average single well injection concentration was 1277 mg / L, and the specific liquid absorption index was 0.59 m 3 / dmMPa, the oil layer production thickness ratio is 61.80%, after adjustment, the average single well injection pressure is 9.7MPa, the average single well injection concentration is 1553mg / L, and the specific liquid absorption index is 0.54m 3 / dmMPa, the oil layer production thickness ratio reached 84.13%. Compared with before the adjustment, the average single well injection pressure increased by 0.5MPa, and the oil layer production thickness ratio increased by 22.33 percentage points. For details, see Table 3 and Table 4:

[0050] Table 3 Statistics of the foundation of the concentration wells in the study area

[0051]

[0052]

[0053] Table 4 Statistical table of concentration adjustment effect in the study area

[0054]

[0055] ③ No adjustments will be made to the injection wells in the reasonable area for the time being, but it is necessary to pay close attention to dynamic changes and make timely adjustments based on the dynamic changes.

[0056] In the test area, when the injection wells in the reasonable area undergo dynamic changes, when a single well falls into other areas, corresponding adjustments are made according to the tracking adjustment method and adjustment chart of the embodiment of the present disclosure.

[0057] (2) Use the production well adjustment chart to guide the tracking and adjustment of production wells in the test area:

[0058] ① Tracking and adjustment of the production well C in the adjustment area

[0059] Basic information of Well C: The effective thickness of the connected injection well is 3.1m, the liquid absorption thickness is 1.8m, and the utilization ratio of the injection well oil layer connected to this well is 58.06% according to the formula. The flow pressure of Well C is 2.49MPa. Figure 2 On the production well adjustment chart shown, the area where well C is located is found to be the adjustment reduction area, and the flushing frequency of this well is reduced according to the conventional technical means in this field, specifically from 4 times / min to 3 times / min.

[0060] Compared with before the adjustment, the daily liquid production of Well C decreased from 24t to 19t, a decrease of 5t; the daily oil production decreased from 1.4t to 1.2t, a decrease of 0.2t; the water content decreased from 94.20 to 93.90, a decrease of 0.30 percentage points, and the flowing pressure increased from 2.49MPa to 3.46MPa, an increase of 0.97MPa.

[0061] By using the tracking adjustment method and tracking adjustment chart of the embodiment of the present disclosure, a total of 9 production wells in the test area were in the parameter adjustment area during the water cut decline period. The production parameters were adjusted in time. Compared with before the adjustment, the daily liquid production decreased from 182t to 145t, a decrease of 37t, and the daily oil production increased from 13.2t to 13.6t. The comprehensive water cut decreased from 92.74% before the adjustment to 90.65%, a decrease of 2.09 percentage points. See Table 5 for details:

[0062] Table 5 Statistics of small reference wells in the study area

[0063]

[0064] ② Follow up and adjust the production well D in the adjustment area

[0065] Basic information of Well D: the effective thickness of the connected injection well is 36.3m, the liquid absorption thickness is 16.4m, and the utilization ratio of the injection well oil layer connected to this well is calculated according to the formula to be 45.18%, and the flow pressure of Well D is 7.60MPa. According to the utilization ratio of the injection well oil layer connected to this well and the flow pressure, the area where Well D is located is found as the adjustment area on the comprehensive adjustment chart of the production well, and the flushing frequency of this well is increased from 3 times / min to 5 times / min according to the conventional technical means in this field.

[0066] Compared with before the adjustment, the daily liquid production of Well D increased from 38t to 47t, an increase of 9t; the daily oil production increased from 1.0t to 6.8t, an increase of 5.8t; the water cut decreased from 97.50 to 85.60, a decrease of 11.90 percentage points; and the flowing pressure decreased from 7.60MPa to 4.31MPa, a decrease of 3.29MPa.

[0067] By using the tracking adjustment method and tracking adjustment chart of the embodiment of the present disclosure, a total of 9 production wells in the test area were in the adjustment area during the water cut decline period. The production parameters were adjusted in time. Compared with before the adjustment, the daily liquid production increased from 271t to 350t, an increase of 79t, and the daily oil production increased from 15.3t to 35.4t, an increase of 20.1t. The comprehensive water cut decreased from 94.35% before the adjustment to 89.88%, a decrease of 4.47 percentage points. See Table 6 for details:

[0068] Table 6 Statistics of major wells in the study area

[0069]

[0070] ③ No adjustments will be made to the production wells in the reasonable area, but dynamic changes need to be closely monitored and corresponding adjustments will be made in real time based on the results of dynamic changes.

[0071] In the test area, when the production wells in the reasonable area undergo dynamic changes, when a single well falls into other areas, corresponding tracking adjustments are performed according to the tracking adjustment method and adjustment chart of the embodiment of the present disclosure.

[0072] In this test area, through the injection and production well adjustment process mentioned above, during the period of water cut decline, a total of 10 injection well plan adjustments were completed, 4 wells were fractured, 9 production well parameters were adjusted up, and 9 production well parameters were adjusted down. After comprehensive adjustment, the maximum water cut decreased by 7.03 percentage points, 2.85 percentage points more than the numerical model prediction, and the stage-by-stage enhanced recovery factor reached 2.86 percentage points, 0.92 percentage points higher than the numerical model prediction.

[0073] The above-described embodiments are only embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present disclosure. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present disclosure, several variations, equivalent substitutions, improvements, etc. may be made, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the attached claims.

Claims

1. A tracking and adjustment chart for injection and production wells in the water-cut decline period of three types of oil layers during polymer flooding, characterized in that: include: Injection well adjustment chart and production well adjustment chart; The injection well adjustment chart is based on a first rectangular area formed by setting the injection well specific liquid absorption index range as the length and the injection well oil layer production thickness ratio range as the width, and the specific liquid absorption index range and the oil layer production thickness ratio range are respectively divided and combined to divide the first rectangular area into a fracturing transformation area, a concentration improvement area and a reasonable area; The production well adjustment chart is based on a second rectangular area formed by a set production well flow pressure range as the length and a set injection well oil layer production thickness ratio range connected to the production well as the width. The production well flow pressure range and the injection well oil layer production thickness ratio range connected to the production well are divided and combined respectively, and the second rectangular area is divided into a small adjustment area, a large adjustment area and a reasonable area.

2. The tracking and adjustment chart for injection and production wells in the water-cut decline period of the third type of oil layer polymer flooding according to claim 1 is characterized by: The length of the first rectangular area is 0m 3 / dmMPa~1.5m 3 / dmMPa, the width range is 0%~100%; in the first rectangular area, the length range is 0m 3 / dmMPa~0.5m 3 / dmMPa, width range is 0%~50%, the rectangular range is the fracturing transformation area; length range is 0m 3 / dmMPa ~1.5m 3 / dmMPa, the width range is 0% to 70% of the area minus the range of the fracturing transformation area is the concentration area; the length range is 0m 3 / dmMPa~1.5m 3 / dmMPa, and the rectangular range with a width of 70% to 100% is the reasonable area.

3. The tracking and adjustment chart for injection and production wells in the water-cut decline period of the third type of oil layer polymer flooding according to claim 2 is characterized by: The length range of the second rectangular area is 0~8.0MPa, and the width range is 0~100%; within the second rectangular area, the rectangular range with a length range of 0~2.5MPa and a width range of 0~80% is the reduced parameter area; the rectangular range with a length range of 5.0MPa~8.0MPa and a width range of 0%~80% is the increased parameter area; the rectangular area with a length range of 0~8.0MPa and a width range of 0%~100% minus the reduced parameter area and the increased parameter area is the reasonable area.

4. The tracking and adjustment chart for injection and production wells in the water-cut decline period of three types of oil layers according to any one of claims 1 to 3, characterized in that: The calculation formula for the production thickness ratio of the injection well oil layer is: H=h in / h oe ; Where: H-proportion of oil layer producing thickness, %; h in - Liquid absorption thickness, m; h oe -Effective thickness, m.

5. A method for tracking and adjusting injection and production wells in the water-cut decline period of three types of oil layers during polymer flooding, characterized in that: include: According to the injection well's apparent liquid absorption index and the oil layer production thickness ratio, the injection well falls into the area on the injection well adjustment chart of any one of claims 1 to 4; the injection wells falling into the fracturing transformation area and the concentration zone are subjected to fracturing transformation treatment or injection concentration increase treatment; the injection wells falling into the common boundary of the fracturing transformation area and the concentration zone are subjected to fracturing transformation treatment; the injection wells falling into the reasonable area and its own boundary are not adjusted; the injection wells falling into the common boundary of the reasonable area and the concentration zone are subjected to injection concentration increase treatment; According to the ratio of the utilized thickness of the oil layer connecting the production well to the injection well and the flow pressure of the well, the area where the production well falls is determined on the production well adjustment chart described in any one of claims 1 to 4; the production parameters of the production wells falling into the reduced parameter area and on its boundary are reduced, and the production parameters of the production wells falling into the increased parameter area and on its boundary are increased; the production parameters of the production wells falling into the reasonable area and its own boundary are not adjusted.

6. The method for tracking and adjusting injection and production wells in the water-cut decline period of three types of oil layers according to claim 3 is characterized by: The production parameter is stroke, stroke frequency or pump diameter.

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