Injection-production well tracking adjustment chart and method during water cut decline period of three types of oil reservoirs subjected to polymer flooding

Abstract

The application discloses a tracking adjustment chart and method for injection-production wells in a water content decreasing period of polymer flooding of three types of oil layers, comprising: an injection well adjustment chart and a production well adjustment chart; the injection well adjustment chart is formed on the basis of a first rectangular area with a set injection well specific imbibition index range as the length and a set injection well oil layer producing thickness proportion range as the width, and the first rectangular area is divided into a fracturing reconstruction area, a concentration increasing area and a reasonable area; the production well adjustment chart is formed on the basis of a second rectangular area with a set production well flow pressure range as the length and a set injection well oil layer producing thickness proportion range connected with the production well as the width, and the second rectangular area is divided into a small adjustment area, a large adjustment area and a reasonable area; and the problem that there is no corresponding adjustment technology for tracking adjustment of injection-production wells in a water content decreasing period of polymer flooding of three types of oil layers is solved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of tertiary oil recovery of three types of oil layers, in particular to injection-production well tracking adjustment method in polymer flooding water cut decline period of three types of oil layers. BACKGROUND

[0002] According to the polymer flooding well pattern evolution in Daqing Oilfield, polymer flooding is first carried out in the first type of oil layer, and then in other oil layers. With the continuous popularization of the first type of oil layer industrialization, the polymer flooding tracking adjustment technology is constantly improved and optimized, and a polymer flooding supporting adjustment technology suitable for the first type of oil layer is formed. At the same time, the remaining reserves of the first type of oil layer decrease year by year. In order to realize the yield replacement, the future polymer flooding exploitation object will be transformed from the first type of oil layer to the third type of oil layer.

[0003] From the sedimentation, the first type of oil layer and the third type of oil layer have great differences. First of all, the sedimentary environment is obviously different. The first type of oil layer is mainly deposited in delta distributary plain facies and delta front facies. The channel sand is developed in a large area on the plane, the drilling rate is high, the effective thickness is large, the permeability is high, the pore throat radius is relatively large, and the suitable injection system is high molecular weight polymer, super high molecular weight polymer and injection system combination mode of high molecular weight polymer first and salt-resistant polymer later. The third type of oil layer belongs to delta front facies and delta front facies. The channel sand is developed in a narrow and small area on the plane, the drilling rate is low, the interchannel sand and the surface are developed in a large area, the sand body continuity is relatively poor on the plane, the pore throat diameter is relatively small, the developed oil layers have many layers but small effective thickness, low permeability, and obvious difference between layers. The polymer flooding field test of the third type of oil layer shows that the third type of oil layer is suitable for injection of low molecular weight polymer system and super low molecular weight polymer system.

[0004] Because of the obvious differences in sedimentary environment, oil layer development and injection system between the first type of oil layer and the third type of oil layer, the relatively perfect polymer flooding water cut decline period tracking adjustment technology obtained by the first type of oil layer is not suitable for the tracking adjustment of the third type of oil layer in the polymer flooding water cut decline period. There is no effective technology matched for the tracking adjustment of the third type of oil layer in the polymer flooding water cut decline period. SUMMARY

[0005] Therefore, the present disclosure provides a three type oil layer polymer flooding water cut decline period injection-production well tracking adjustment chart to solve the problem that there is no corresponding adjustment technology for tracking adjustment of injection-production well in the polymer flooding water cut decline period of the third type of oil layer.

[0006] In addition, the present disclosure also provides a method for tracking adjustment of injection-production well in the polymer flooding water cut decline period of the third type of oil layer.

[0007] In the first aspect, the three type oil layer polymer flooding water cut decline period injection-production well tracking adjustment chart comprises:

[0008] an injection well adjustment chart and a production well adjustment chart;

[0009] The injection well adjustment chart is a first rectangular area formed with a set injection well specific index range as long and a set injection well oil layer producing thickness proportion range as wide, the specific index range and the oil layer producing thickness proportion range are respectively divided and combined, and the first rectangular area is divided into a fracturing reconstruction area, a concentration area and a reasonable area;

[0010] The production well adjustment chart is a second rectangular area formed with a set production well flow pressure range as long and a set injection well oil layer producing thickness proportion range connected with the production well as wide, the production well flow pressure range and the injection well oil layer producing thickness proportion range connected with the production well are respectively divided and combined, 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 / d.m.MPa~1.5m 3 / d.m.MPa, and the width range is 0%~100%; in the first rectangular area, the length range is 0m 3 / d.m.MPa~0.5m 3 / d.m.MPa, and the width range is 0%~50%; the rectangular area with the length range of 0m 3 / d.m.MPa~1.5m 3 / d.m.MPa, and the width range is 0%~70%; the area of the first rectangular area minus the fracturing reconstruction area is the concentration area; the length range is 0m 3 / d.m.MPa~1.5m 3 / d.m.MPa, and the width range is 70%~100%; the rectangular area with the length range of 0m

[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%; in the second rectangular area, the rectangular area with the length range of 0~2.5MPa and the width range of 0~80% is the small adjustment area; the rectangular area with the length range of 5.0MPa~8.0MPa and the width range of 0%~80% is the large adjustment area; the rectangular area with the length range of 0~8.0MPa and the width range of 0%~100% minus the small adjustment area and the large adjustment area is the reasonable area.

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

[0014] H=h in / hoe ;

[0015] H - oil layer producing thickness ratio, %; h in - liquid absorption thickness, m; h oe - effective thickness, m.

[0016] In a second aspect, the injection-production well tracking adjustment method for the three types of oil layers in the polymer flooding water cut decline period comprises the following steps:

[0017] According to the apparent liquid absorption index of the injection well and the oil layer producing thickness ratio, the injection well is determined to fall into a region on the injection well adjustment chart in the first aspect; the injection well falling into the fracturing reconstruction area and the thickening area is subjected to fracturing reconstruction treatment or injection concentration up-regulation treatment; the injection well falling into the common boundary of the fracturing reconstruction area and the thickening area is subjected to fracturing reconstruction treatment; the injection well falling into the reasonable area and its own boundary is not subjected to adjustment; the injection well falling into the reasonable area and the common boundary of the thickening area is subjected to injection concentration up-regulation treatment.

[0018] According to the oil layer producing thickness ratio of the injection well connected to the production well and the well flow pressure, the production well is determined to fall into a region on the production well adjustment chart in any one of claims 1-4; the production well falling into the small parameter adjustment area and its boundary is subjected to small production parameter adjustment treatment, the production well falling into the large parameter adjustment area and its boundary is subjected to large production parameter adjustment treatment, and the production well falling into the reasonable area and its own boundary is not subjected to adjustment.

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

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

[0021] The injection-production well tracking adjustment chart and method for the three types of oil layers in the polymer flooding water cut decline period of the present disclosure are developed under the condition of injecting a low molecular weight polymer clear and dilute system, and are used to guide the tracking adjustment of injection-production wells in the polymer flooding water cut decline period of the three types of oil layers. The application results show that the oil layer producing thickness of the research area is obviously improved through timely tracking adjustment of injection-production wells, the oil production of production wells is obviously increased and water is obviously reduced, and good polymer flooding development effects are achieved. The problem that there is no corresponding adjustment technology for tracking adjustment in the polymer flooding water cut decline period of the three types of oil layers is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

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

[0023] Figure 1This is a tracking and adjustment chart of injection wells during the water cut decline period of polymer flooding in three types of oil reservoirs according to embodiments of this disclosure;

[0024] Figure 2 This is a tracking and adjustment chart of production wells during the water cut decline period of polymer flooding in three types of oil reservoirs, according to embodiments of this disclosure. Detailed Implementation

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

[0026] Furthermore, those skilled in the art should understand that the accompanying drawings are for illustrative purposes, features, and advantages of this disclosure only, and are not actually drawn to scale. Also, unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than exclusive or exhaustive; that is, meaning "including but not limited to."

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

[0028] (1) Method for establishing and tracking the adjustment of injection well adjustment charts

[0029] Depend on Figure 1 As shown: The length of the rectangle is the specific fluid absorption index of the injection well, ranging from 0 to 1.5, and the unit is meters. 3 / dmMPa, with the width of a rectangle representing the percentage of the injected well's reservoir thickness, and the length ranging from 0-100, expressed as a percentage, forms a rectangular chart. The chart is divided into three regions, with the longest side ranging from 0m... 3 / dmMPa-0.5m 3 A rectangular area with a pressure of / dmMPa and a width ranging from 0% to 50% is designated as the fracturing zone. Injection wells located within this zone undergo fracturing treatment. The length range is 0m. 3 / dmMPa~1.5m 3 The enrichment zone is defined as a rectangular area with a width ranging from 0% to 70% of the fracturing zone, and the enrichment zone is the area within which the injection concentration of injection wells located in the enrichment zone is increased. Fracturing treatment is applied to injection wells located at the common boundary between the fracturing zone and the enrichment zone. The long side ranges from 0m / dm / MPa. 3 / d.m.MPa-1.5m 3 / d.m.MPa, the rectangular area formed by the range of 70%-100% of the long side is the reasonable area, the injection wells in the reasonable area and on the boundary of the reasonable area keep the current injection parameters without adjustment; the injection wells on the boundary of the reasonable area and the enrichment area are adjusted in injection concentration.

[0030] (2) Establishment of adjustment chart for production wells and tracking adjustment method

[0031] As shown in Figure 2 : the length of the rectangular area is the flowing pressure of the production well, the range of the length is 0-8.0 MPa, and the width of the rectangular area is the proportion of the oil layer producing thickness of the injection well connected to the production well, the range of the length is 0-100%, and a rectangular chart is formed, and there are three areas in the chart, wherein the rectangular area with the range of 0 MPa-2.5 MPa in the long side and the range of 0%-80% in the wide side is the small adjustment area, the production parameters (stroke, stroke frequency, pump diameter) of the production well in the small adjustment area and on the boundary thereof are adjusted to be small; the rectangular area formed by the range of 5.0 MPa-8.0 MPa in the long side and the range of 0%-80% in the wide side is the large adjustment area, the production parameters (stroke, stroke frequency, pump diameter) of the production well in the large adjustment area and on the boundary thereof are adjusted to be large; the rectangular area with the range of 0 MPa-8.0 MPa in the length and the range of 0-100% in the width minus the small adjustment area and the large adjustment area is the reasonable area, the production parameters of the production well in the reasonable area and on the boundary thereof are kept without adjustment, but real-time tracking adjustment needs to be made according to the development situation.

[0032] The above adjustment chart and tracking adjustment method are applied to the upper return test area of the three types of oil layers in the X area, there are 14 injection wells and 21 production wells in the whole area, the polymer flooding is started in the test area in February 2020, after 4 months of polymer injection, the test area enters the water cut decline period, the injection well adjustment chart is used to guide the injection concentration of 10 well times and the fracturing of 4 well times; the production well adjustment chart is used to guide the large adjustment of 9 well times and the small adjustment of 9 well times of the production well. The specific process is as follows:

[0033] (1) The injection well tracking adjustment in the test area is guided by using the injection well adjustment chart:

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

[0035] The basic situation of A well: effective thickness 3.6 m, injection pressure 12.0 MPa, daily injection volume 20 m 3 , injection concentration 391 mg / L, specific liquid absorption index 0.46 m 3d.m.MPa, the liquid absorption thickness is 1.0 m, the A well oil layer producing thickness ratio is calculated by the following formula:

[0036] H = h in / h oe ;

[0037] H = h in - the liquid absorption thickness, m; h oe - the effective thickness, m.

[0038] The A well oil layer producing thickness ratio is 27.78% by the above formula calculation, according to the oil layer producing thickness ratio and the specific liquid absorption index, the A well is in the fracturing area according to the injection well adjustment chart shown in the figure. Figure 1

[0039] Compared with before fracturing, the injection pressure of the A well is decreased from 12.0 MPa to 6.0 MPa, the daily injection volume is increased from 20 m 3 to 40 m 3 , the injection concentration is increased from 391 mg / L to 1456 mg / L, the specific liquid absorption index is increased from 0.46 m 3 / d.m.MPa to 1.39 m 3 / d.m.MPa, the oil layer producing thickness ratio is increased from 27.78% to 100%, according to the oil layer producing thickness ratio and the specific liquid absorption index of the A well after fracturing, the area of the chart is found, and the result shows that the A well is in the reasonable area after fracturing.

[0040] The tracking adjustment method and the tracking adjustment chart of the embodiment of the present disclosure are used, the test area is in the water content decreasing period, according to the injection well adjustment chart, 4 injection wells in the fracturing area are fractured, and good fracturing effect is obtained after fracturing. Compared with before fracturing, the average single well injection pressure is decreased by 4.8 MPa, the daily injection volume is increased by 75 m 3 , the specific liquid absorption index is increased from 0.29 m 3 / d.m.MPa to 1.00 m 3 / d.m.MPa, the oil layer producing thickness ratio is increased from 33.95% to 85.61%, according to the specific liquid absorption index and the oil layer producing thickness ratio of the injection well after fracturing, the injection well adjustment chart is contrasted, and the result shows that the four fracturing wells are in the reasonable area, and specific details are shown in Table 1 and Table 2:

[0041] Table 1: Basic situation statistical table of the fractured injection well in the research area

[0042]

[0043] Table 2: Effect statistical table of the injection well before and after fracturing in the research area​

[0044]

[0045]

[0046] ②The tracking adjustment of the injection well B in the enrichment area:

[0047] The basic situation of the well B: the effective thickness is 9.3 m, the injection pressure is 9.9 MPa, the daily injection volume is 50 m 3 , the injection concentration is 1165 mg / L, the specific imbibition index is 0.54 m 3 / d.m.MPa, and the imbibition thickness is 5.1 m. According to the formula, the oil layer producing thickness ratio of the well is 54.84%. According to the oil layer producing thickness ratio and the specific imbibition index, the area of the well B is found out as the enrichment area in the injection well adjustment chart, and the injection concentration of the well is adjusted upward according to the conventional technical means in the field.

[0048] Compared with before the adjustment, the injection pressure of the well B is increased from 9.9 MPa to 10.6 MPa, the daily injection volume is kept as 50 m 3 , the injection concentration is increased from 1165 mg / L to 1586 mg / L, the oil layer producing thickness ratio is increased from 54.84% to 90.32%, and the increase is 35.48%.

[0049] According to the injection well adjustment chart, the injection concentration of the injection well in the enrichment area is adjusted upward, and the injection well adjustment is performed for 10 wells. Before the adjustment, the average single well injection pressure is 9.2 MPa, the average single well injection concentration is 1277 mg / L, the specific imbibition index is 0.59 m 3 / d.m.MPa, and the oil layer producing thickness ratio is 61.80%. After the adjustment, the average single well injection pressure is 9.7 MPa, the average single well injection concentration is 1553 mg / L, the specific imbibition index is 0.54 m 3 / d.m.MPa, and the oil layer producing thickness ratio is 84.13%. Compared with before the adjustment, the average single well injection pressure is increased by 0.5 MPa, and the oil layer producing thickness ratio is increased by 22.33%. Details are shown in Table 3 and Table 4.

[0050] Table 3: The basic situation statistics table of the enrichment well in the research area

[0051]

[0052]

[0053] Table 4: The concentration adjustment effect statistics table of the research area

[0054]

[0055] ③ For the injection well in the reasonable area, no adjustment is made temporarily, but the dynamic change needs to be closely monitored, and adjustment is made in time according to the dynamic change.

[0056] When the injection well in the reasonable area in the test area has a dynamic change, and the single well falls into other areas, the corresponding adjustment is made according to the tracking adjustment method and the adjustment chart of the embodiment of the present disclosure.

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

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

[0059] The basic situation of C well: the effective thickness of the connected injection well is 3.1m, the liquid absorption thickness is 1.8m, the dynamic thickness ratio of the connected injection well of the well is 58.06% according to the formula, the flow pressure of C well is 2.49MPa, and the dynamic thickness ratio of the connected injection well of the well and the flow pressure are found in the production well adjustment chart shown in Figure 2 The area of C well is the small adjustment area, and the pumping frequency of the well is lowered according to the conventional technical means in the art, specifically from 4 times / min to 3 times / min.

[0060] Compared with before the adjustment, the daily liquid production of C well is reduced from 24t to 19t, reduced by 5t; the daily oil production is reduced from 1.4t to 1.2t, reduced by 0.2t; the water content is reduced from 94.20 to 93.90, reduced by 0.30 percentage points; and the flow pressure is increased from 2.49MPa to 3.46MPa, increased by 0.97MPa.

[0061] Using the tracking adjustment method and the tracking adjustment chart of the embodiment of the present disclosure, there are 9 production wells in the small adjustment area in the test area in the water content reduction period, and the production parameters are timely adjusted. Compared with before the adjustment, the daily liquid production is reduced from 182t to 145t, reduced by 37t, the daily oil production is increased from 13.2t to 13.6t, the comprehensive water content is reduced from 92.74% before the adjustment to 90.65%, reduced by 2.09 percentage points, and the details are shown in Table 5:

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

[0063]

[0064] ② Tracking adjustment of the production well D well in the large adjustment area

[0065] The basic situation of well D: the effective thickness of the connected injection well is 36.3 m, the liquid absorption thickness is 16.4 m, the proportion of the oil layer thickness of the connected injection well of the well D is 45.18% according to the formula, the flow pressure of the well D is 7.60 MPa, the region where the well D is located is found to be the large adjustment area on the production well comprehensive adjustment chart according to the proportion of the oil layer thickness of the connected injection well of the well D and the flow pressure, and the frequency of the well D is adjusted to 5 times / min from 3 times / min according to the conventional technical means in the field.

[0066] Compared with before the adjustment, the daily liquid production of the well D is increased from 38 t to 47 t, the daily oil production is increased from 1.0 t to 6.8 t, the water content is decreased from 97.50 to 85.60 by 11.90 percentage points, and the flow pressure is decreased from 7.60 MPa to 4.31 MPa by 3.29 MPa.

[0067] The tracking adjustment method and the tracking adjustment chart are used, and the test area has 9 production wells in the large adjustment area in the water content decreasing period, and the production parameters are timely adjusted, compared with before the adjustment, the daily liquid production is increased from 271 t to 350 t, the daily oil production is increased from 15.3 t to 35.4 t, the comprehensive water content is decreased from 94.35% to 89.88% by 4.47 percentage points, and the specific details are shown in Table 6:

[0068] Table 6: Statistics of the large adjustment wells in the research area

[0069]

[0070] ③ The production well in the reasonable area is not adjusted, but the dynamic change needs to be closely observed, and the corresponding adjustment is made in real time according to the dynamic change result.

[0071] When the production well in the reasonable area in the test area has a dynamic change, if the single well falls into other areas, the corresponding tracking adjustment is made according to the tracking adjustment method and the adjustment chart.

[0072] In the test area, the injection-production well adjustment is completed through the above process, 10 injection well adjustment times, 4 fracturing times, 9 production well parameter adjustment times, and 9 production well parameter adjustment times are completed in the water content decreasing period. After the comprehensive adjustment, the water content is decreased by 7.03 percentage points at most, which is more than the numerical model prediction by 2.85 percentage points, the stage enhanced oil recovery is 2.86 percentage points, which is higher than the numerical model prediction by 0.92 percentage points.

[0073] The above-described embodiments are merely illustrative of the implementation of the present disclosure, which are described in a more specific and detailed manner, but should not be understood as a limitation on the scope of the patent of the present disclosure. It should be noted that, for those skilled in the art, without departing from the concept of the present disclosure, a number of modifications, equivalent replacements, improvements, etc. can be made, which are all within the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A method for establishing a tracking and adjustment chart for injection and production wells during the water cut decline phase of polymer flooding in three types of oil reservoirs, characterized in that, include: Adjusted charts for injection wells and production wells; The injection well adjustment chart is based on a first rectangular area with a set injection well specific fluid absorption index range as the length and a set injection well oil layer utilization thickness ratio range as the width. The specific fluid absorption index range and the oil layer utilization thickness ratio range are divided and combined respectively, and the first rectangular area is divided into a fracturing zone, a enrichment zone and a reasonable zone. The production well adjustment chart is based on a second rectangular area formed by the set production well flowing pressure range as the length and the set injection well oil layer utilization thickness ratio range connected to the production well as the width. The production well flowing pressure range and the injection well oil layer utilization thickness ratio range connected to the production well are divided and combined respectively, and the second rectangular area is divided into a small parameter adjustment area, a large parameter adjustment area, and a reasonable area. The formula for calculating the proportion of the oil layer utilized in the injection well is: H=h in / h oe ; Where: H - proportion of oil layer thickness utilized, %; h in - Liquid absorption thickness, m; h oe - Effective thickness, m.

2. The method for establishing a tracking and adjustment chart for injection and production wells during the water cut decline period of polymer flooding in three types of oil reservoirs according to claim 1, characterized in that: The length of the first rectangular region is 0m. 3 / dmMPa~1.5m 3 / dmMPa, width range of 0% to 100%; within the first rectangular area, length range of 0m. 3 / dmMPa~0.5m 3 The fracturing zone is defined as a rectangular area with a width ranging from 0% to 50% and a pressure of / dm / MPa; its length ranges from 0m. 3 / dmMPa ~1.5m 3 The enrichment zone is defined as a region with a width ranging from 0% to 70% of the fracturing zone, and a length ranging from 0m to 70%. 3 / dmMPa~1.5m 3 / dmMPa, the rectangular area with a width range of 70% to 100% is the reasonable area.

3. The method for establishing a tracking and adjustment chart for injection and production wells during the water cut decline period of polymer flooding in three types of oil reservoirs according to claim 2, characterized in that: The length of the second rectangular region ranges from 0 to 8.0 MPa, and the width ranges from 0 to 100%. Within the second rectangular region, the rectangular region with a length range of 0 to 2.5 MPa and a width range of 0 to 80% is the reduced parameter adjustment region; the rectangular region with a length range of 5.0 MPa to 8.0 MPa and a width range of 0% to 80% is the increased parameter adjustment region; the rectangular region with a length range of 0 to 8.0 MPa and a width range of 0% to 100%, minus the reduced parameter adjustment region and the increased parameter adjustment region, constitutes the reasonable region.

4. A method for tracking and adjusting injection and production wells during the water cut decline phase of polymer flooding in three types of oil reservoirs, characterized in that... include: Based on the specific fluid absorption index and the proportion of oil reservoir activated thickness of the injection well, the injection well landing area is determined on the injection well adjustment chart according to any one of claims 1-3; injection wells landing in the fracturing stimulation zone and the enrichment zone are subjected to corresponding fracturing stimulation treatment or injection concentration increase treatment; injection wells landing on the common boundary of the fracturing stimulation zone and the enrichment zone are subjected to fracturing stimulation treatment; injection wells landing on the reasonable zone and its own boundary are not adjusted; injection wells landing on the common boundary of the reasonable zone and the enrichment zone are subjected to injection concentration increase treatment; Based on the ratio of the oil layer thickness utilized by the production well to the injection well and the flowing pressure of the well, the production well's entry area is determined on the production well adjustment chart according to any one of claims 1-3; the production parameters of the production wells that fall into the reduced parameter adjustment area and its boundary are adjusted to be smaller, and the production parameters of the production wells that fall into the increased parameter adjustment area and its boundary are adjusted to be larger; the production parameters of the production wells that fall into the reasonable area and its own boundary are not adjusted.

5. The method for tracking and adjusting injection and production wells during the water cut decline period of polymer flooding in three types of oil reservoirs according to claim 4, characterized in that: The production parameters are stroke, number of strokes, or pump diameter.

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