A quantitative comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells

Abstract

This invention relates to oil and gas field development technology and discloses a quantitative comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells. The method includes: determining whether the target water control well is a producing old well or a new well; collecting relevant operating parameters of adjacent wells at the same oil column height and formation level before and after the application of the water control technology, based on whether it is a producing old well or a new well; collecting relevant parameters required for evaluating the economic benefits of water control in a single well; evaluating the impact of the water control technology on oil and water production by comparing the water production index and water cut, using indicators such as the effective period of water control, increased oil production, and changes in water production, and evaluating the water control effect; conducting a single-well water control economic evaluation based on the water control effect; and comprehensively evaluating the water control effect and economy of the horizontal well. Using the method provided by this invention, a quantitative comprehensive evaluation of the water control effect is conducted from the perspectives of increasing oil production, stabilizing oil production, controlling water, and economics, effectively evaluating the oil stabilization and water control effect and economy of horizontal wells, and effectively guiding the design of water control schemes and process selection.

Description

Technical Field

[0001] This invention relates to oil and gas field development technology, specifically to a comprehensive evaluation method for the quantitative assessment of the oil stabilization and water control effects of horizontal wells. Background Technology

[0002] Oil stabilization and water control are essential for bottom water reservoir development. Oil stabilization and water control technologies are broadly classified into two categories: water control in horizontal open-hole wells and selective perforation water control in horizontal casing wells. Water control in horizontal open-hole wells further includes technologies such as center tubes, variable density screens, inflow control valves (ICDs), intelligent inflow control valves (AICDs), and continuous packers. Water control effectiveness evaluation is a crucial step and method for judging the effectiveness of a water control technology. It is also a primary basis for the rational selection of water control technologies and the design of water control schemes. A reasonable and accurate water control effectiveness evaluation can effectively assess the adaptability and compatibility of a water control technology with geological reservoir characteristics, fluid properties, well conditions, and other operating conditions. Therefore, water control effectiveness evaluation is particularly important for the selection, application, and post-evaluation of water control technologies.

[0003] Currently, various oilfields and service providers employ diverse methods to evaluate water control effectiveness, such as evaluation using a single water cut index, production ratio comparison, comparison of water cut changes before and after measures, comparison with adjacent wells, and comparison of production curves. However, a unified quantitative index system and evaluation method for water control effectiveness are lacking. Furthermore, these evaluation methods typically neglect the evaluation of oil production increase or stabilization effects, focusing solely on technical effectiveness and lacking a comprehensive economic evaluation of the process application. Existing evaluation methods cannot meet the needs of quantitative evaluation of water control effectiveness and the development of water control technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a quantitative and comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells. This method is reliable in principle, convenient in practice, and can effectively evaluate the application effect and economy of water control technology. It provides a scientific basis for the rational selection and effect evaluation of water control technology and has broad application prospects.

[0005] To achieve the above objectives, this invention provides a quantitative comprehensive evaluation method for the oil stabilization and water control effects of horizontal wells, the method comprising the following steps:

[0006] (1) Determine whether the target well for water control is an old producing well or a new well;

[0007] (2) Collect relevant operating parameters of old or new production wells before and after the application of water control technology, as well as the production of adjacent wells at the same oil column height and layer, including the meter oil production index, daily oil production, water cut, oilfield decline rate γ, reservoir thickness, etc.

[0008] (3) Collect relevant parameters required for evaluating the economic benefits of water control in a single well. These relevant parameters include the cost of water control.tr Unit water treatment cost i w Oil prices o RMB exchange rate δ;

[0009] (4) Evaluate the water control effect of old and new production wells respectively. The evaluation of the water control effect of old production wells includes: comparing the production situation before and after the application of water control technology; the evaluation of the water control effect of new wells includes: comparing the new well with the well produced by the same well or with adjacent wells at the same oil column height and layer.

[0010] (5) By comparing the oil recovery index and water content, the effects of water control technology on oil production and water production are evaluated using index parameters including the effective period of water control, oil production increase and water production change, and then the water control effect is evaluated.

[0011] (6) Evaluate the economic efficiency of single-well water control based on the water control effect;

[0012] (7) The water control effect of horizontal wells is comprehensively evaluated by taking the oil production index, water cut, water control period, oil production increase, water production change and single well benefit as quantitative index system. Combined with the calculation results of steps (1) to (6), the water control effect and economy of horizontal wells are evaluated.

[0013] Preferably, the oil recovery index in step (2) includes the oil recovery index K0 before the application of water control technology in the old production wells and the oil recovery index K after the application of water control technology in the target wells. t New well water control target well production per meter oil production index K pt Compared with the target well for water control in the same formation, the oil recovery index K of adjacent wells is... lt ;

[0014] Nissan oil includes Nissan oil Q before the application of water control technology in old production wells. o0 Daily oil production Q after the application of water control technology in target wells ot New well water control target well production daily oil Q opt Comparison of daily oil production (Q) of target well for water control in new well with adjacent wells at the same formation olt And the daily oil production Q corresponding to time i oi ;

[0015] Moisture content includes the moisture content S before the application of water control technology in old production wells. w0 Water cut per meter (S) after application of water control technology in target wells wt New well water control target well production water cut S wpt , New well water control target well in the same formation, water cut S of adjacent wells wlt and the water content S corresponding to time i wi ;

[0016] The reservoir thickness includes the reservoir thickness h of the water control well in the old production well, the reservoir thickness h of the water control target well in the new well p , and the reservoir thickness h of the adjacent well in the same layer of the water control well in the new well l .

[0017] Preferably, the process of evaluating the water control effect in step (5) includes:

[0018] 1) If K t < K0 (old well water control), K t < K pt or K t < K lt (new well water control), due to the application of the water control process, the crude oil production is reduced (ΔQ o < 0), which is contrary to the purpose of stabilizing oil production and controlling water or increasing oil production and controlling water. The application effect is poor and the water control is ineffective;

[0019] 2) If K t = K0 (old well water control), K t = K pt or K t = K lt (new well water control), the application of the water control process has no effect on the crude oil production (ΔQ o = 0). In this case, it can be further divided into the following two cases according to the water cut comparison:

[0020] ① If S wt ≧ S w0 (old well water control), S wt ≧ S wpt or S wt ≧ S wlt (new well water control), the water cut increases instead of decreasing after the application of the water control process, and the water control is ineffective;

[0021] ② If S wt < S w0 (old well water control), S wt < S wpt or S wt < S wlt (new well water control), the water cut decreases after the application of the water control process, and the water control is effective, belonging to stabilizing oil production and controlling water. According to the comparison of the water cut change, the following formulas are used to calculate the water control effective period T and the water production change amount ΔQ w ;

[0022] a) Old well water control:

[0023] Water control effective period: T = t(S wt = S w0 ) - t0, where t0 represents the initial production moment after water control, and t(S wt = S w0This indicates the time when the moisture content is the same as before the water control process was applied during production.

[0024] Changes in water production: n represents the production well time after the measure;

[0025] b) Water control in new wells:

[0026] Water control effective period: T = t(S) wt =S wpt ,S wlt )-t0,t(S wt =S wpt ,S wlt This indicates the time when the water cut is the same as that of the well being produced or compared with the water cut of the adjacent well after the application of the water control technology.

[0027] Changes in water production: (Compared with production schedule)

[0028] (Compared with neighboring wells);

[0029] 3) If K t >K0 (Old well water control), K t >K pt or K t >K lt (Water control in new wells) The application of water control technology increased crude oil production, resulting in effective oil production increase (ΔQ). o >0), based on the comparison of changes in the oil recovery index, the effective period of water control T and the increase in oil production ΔQ are calculated using the following formulas respectively. o ;

[0030] a) Water control using old wells:

[0031] Water control effective period: T = t(K) t =K0)-t0,t(K t =K0) represents the time when the oil recovery index of rice is the same as that before water control during the production process after the application of the water control technology.

[0032] Increased fuel consumption: n represents the production well time after the measure, ΔP t ΔP0 represents the production pressure difference after the application of the water control technology, while ΔP0 represents the production pressure difference before the application of the water control technology in the old well.

[0033] b) Water control in new wells:

[0034] Water control effective period: T = t(K) t =K pt ,K lt )-t0,t(K t =Kpt K lt This indicates the time when the water-controlled production index (MRI) is the same as that of the well in the production process after the application of the water control technology.

[0035] Increased fuel consumption: (Compared with production schedule)

[0036] (Compared with neighboring wells), ΔP pt Indicates the production pressure difference and ΔP of the target well for water control in the new well. lt This indicates the production pressure difference between the new well and adjacent wells at the same water control level.

[0037] ①If S wt >S w0 (Water control from the old well), S wt >S wpt or S wt >S wlt (Water control in new wells) After the application of water control technology, the water content increases, which increases the production of crude oil and water. The effect of water control needs to be comprehensively evaluated in conjunction with economic efficiency.

[0038] ②If S wt =S w0 (Water control from the old well), S wt =S wpt or S wt =S wlt (New well water control) After the water control technology is applied, the water content remains unchanged, but the actual water production increases. The water control effect needs to be comprehensively evaluated in conjunction with the economic benefits.

[0039] ③If S wt w0 (Water control from the old well), S wt wpt or S wt wlt (New well water control) After the water control technology is applied, the water cut decreases, but the actual water production can remain unchanged (ΔQ). w =0) or decrease (ΔQ) w <0), this operating condition is the most ideal situation for increasing oil and controlling water;

[0040] The change in permeable water ΔQ can be calculated using the following formula. w :

[0041] a) Water control using old wells:

[0042]

[0043] b) Water control in new wells:

[0044] Compared with production schedule: S​​​wpi This represents the water cut at time i under the condition of controlled water production in a new well.

[0045] Comparison with neighboring wells: S wli This represents the water cut of the adjacent well at time i in the same stratum under the condition of water control by the new well.

[0046] Preferably, the process of evaluating the economic efficiency of single-well water control in step (6) includes: according to formula I wj (I wz )=ΔQ w ×i w I o =S o ×ΔQ o Calculate the increase in water treatment fee I due to the increase or decrease in water production, respectively, using ×6.2898×δ. wz Or reduce water treatment fees I wj Increase oil profits o Then, according to the formula ΔI = (I o +I wj )-(I tr +I wz Calculate the economic benefit ΔI (relationship between cost input and economic output) of single-well water control;

[0047] If ΔI>0, then there is positive economic benefit and money is made;

[0048] If ΔI < 0, then there is a negative economic benefit and a loss of money.

[0049] If ΔI = 0, then there is zero economic benefit, meaning neither profit nor loss.

[0050] Preferably, the quantitative index system for water control effect of horizontal wells in step (7) includes the oil production index, water cut, effective period of water control, increase in oil production, change in water production, and single-well benefits.

[0051] Preferably, in step (7), the water control effect and economy of the horizontal well are only effective if the water control increases or remains unchanged in oil production. Water control technology that sacrifices oil production by limiting liquid is ineffective. If the water production increases, remains unchanged or decreases under the premise of increasing or stabilizing oil production, a comprehensive evaluation should be conducted in conjunction with the economic benefits of water control in a single well. Only when the economic benefits of water control in a single well ΔI>0 are the corresponding water control technology measures effective.

[0052] The beneficial effects of the present invention through the above technical solution are as follows:

[0053] The present invention provides a quantitative comprehensive evaluation method for the oil stabilization and water control effects of horizontal wells. This method utilizes a quantitative evaluation model to differentiate between water control in old and new production wells. It comprehensively considers indicators such as the well oil production index, water cut, effective water control period, increased oil production, water production change, and single-well efficiency. The method provides a quantitative comprehensive evaluation from the perspectives of oil production, oil stabilization, water control, and economic efficiency. The principle is reliable, the operation is simple, and it can effectively evaluate the oil stabilization and water control effects and economic efficiency of horizontal wells. It provides a scientific method for the rational selection, application, and post-evaluation of water control technologies, and can effectively guide the design of tailored water control schemes and the selection of water control technologies. Attached Figure Description

[0054] Figure 1 This is a flowchart of a quantitative comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells in this invention;

[0055] Figure 2 This is a schematic diagram of the water cut curve changes before and after water control in an old production well in this invention;

[0056] Figure 3 This is a schematic diagram illustrating the change in the oil recovery index curve before and after water control in old production wells in this invention;

[0057] Figure 4 This is a schematic diagram of the water cut curve change in the new well in this invention;

[0058] Figure 5 This is a schematic diagram of the change in the water-controlled oil recovery index curve of a new well in this invention;

[0059] Figure 6 This is a template for the quantitative and comprehensive evaluation of the water control effect in old production wells in this invention;

[0060] Figure 7 This is a template for the quantitative and comprehensive evaluation of the water control effect of new wells in this invention;

[0061] Figure 8 This is the quantitative comprehensive evaluation result of the water control effect in the old production well X1 in this invention;

[0062] Figure 9 This is the quantitative comprehensive evaluation result of the water control effect of the new well X2 in this invention. Detailed Implementation

[0063] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0064] This invention provides a quantitative comprehensive evaluation method for the oil stabilization and water control effects of horizontal wells, the method comprising the following steps:

[0065] (1) Determine whether the target well for water control is an old producing well or a new well;

[0066] (2) Collect relevant operating parameters of old or new production wells before and after the application of water control technology, as well as the production of adjacent wells at the same oil column height and layer, including the meter oil production index, daily oil production, water cut, oilfield decline rate γ, reservoir thickness, etc.

[0067] (3) Collect relevant parameters required for evaluating the economic benefits of water control in a single well. These relevant parameters include the cost of water control. tr Unit water treatment cost i w Oil prices o RMB exchange rate δ;

[0068] (4) Evaluate the water control effect of old and new production wells respectively. The evaluation of the water control effect of old production wells includes: comparing the production situation before and after the application of water control technology; the evaluation of the water control effect of new wells includes: comparing the new well with the well produced by the same well or with adjacent wells at the same oil column height and layer.

[0069] (5) By comparing the oil recovery index and water content, the effects of water control technology on oil production and water production are evaluated using index parameters including the effective period of water control, oil production increase and water production change, and then the water control effect is evaluated.

[0070] (6) Evaluate the economic efficiency of single-well water control based on the water control effect;

[0071] (7) The water control effect of horizontal wells is comprehensively evaluated by taking the oil production index, water cut, water control period, oil production increase, water production change and single well benefit as quantitative index system. Combined with the calculation results of steps (1) to (6), the water control effect and economy of horizontal wells are evaluated.

[0072] This invention provides a quantitative comprehensive evaluation method for the water control and oil stabilization effect of horizontal wells. Target wells for water control are categorized as new or old wells. Using indicators such as the water recovery index (RPI), water cut, effective water control period, increased oil production, water production change, and single-well efficiency, a quantitative evaluation model for horizontal well water control is employed to assess the changes in RPI and water cut, as well as economic viability. Parameters such as the effective water control period, increased oil production, and water production change are calculated to comprehensively evaluate the application effect and economic benefits of the water control technology. (See attached text.) Figure 1 The flowchart shown illustrates this. When evaluating new wells, the main comparison is made with adjacent wells of the same production level or at the same formation and oil column height. When evaluating older wells, the main comparison is made with production before and after any intervention measures.

[0073] The evaluation method provided by this invention is reliable in principle and convenient in practice. It can effectively evaluate the application effect and economy of water control technology, and provides a scientific basis for the rational selection and effect evaluation of water control technology. It has broad application prospects.

[0074] According to the present invention, preferably, in step (2), the meter oil production index includes the meter oil production index K0 before the application of the water control process in the production old well, from the meter oil production index K after the application of the water control process in the water control target well, t the meter oil production index K pt for the production allocation of the new well water control target well, and the meter oil production index K lt of the adjacent well in the same horizon as the new well water control target well;

[0075] The daily oil production includes the daily oil production Q o0 before the application of the water control process in the production old well, the daily oil production Q ot after the application of the water control process in the water control target well, the daily oil production Q opt for the production allocation of the new well water control target well, the daily oil production Q olt of the adjacent well in the same horizon as the new well water control target well, and the daily oil production Q oi corresponding to the i-th moment;

[0076] The water cut includes the water cut S w0 before the application of the water control process in the production old well, the water cut S wt after the application of the water control process in the water control target well, the water cut S wpt for the production allocation of the new well water control target well, the water cut S wlt of the adjacent well in the same horizon as the new well water control target well, and the water cut S wi corresponding to the i-th moment;

[0077] The reservoir thickness includes the reservoir thickness h of the production old well with water control, the reservoir thickness h p of the new well water control target well, and the reservoir thickness h l of the adjacent well in the same horizon as the new well with water control.

[0078] ] According to the present invention, preferably, in step (5), the process of evaluating the water control effect includes:

[0079] 1) If K t < K0 (for old well water control), K t < K pt ​​​​​​​​​​​​​​​​​​​​​=0), in this case, it can be further divided into the following two situations based on the comparison of moisture content:

[0081] ①If S wt ≧S w0 (Water control from the old well), S wt ≧S wpt or S wt ≧S wlt (New well water control) After the water control technology was applied, the water content increased instead of decreasing, and the water control was ineffective;

[0082] ②If S wt w0 (Water control from the old well), S wt wpt or S wt wlt (New Well Water Control) After the application of the water control technology, the water cut decreased, indicating effective water control. This is considered stable oil production and water control. Based on the comparison of water cut changes, the effective period of water control (T) and the change in production water (ΔQ) are calculated using the following formulas. w ;

[0083] a) Water control using old wells:

[0084] Water control effective period: T = t(S) wt =S w0 )-t0, where t0 represents the initial production time after water control, t(S wt =S w0 This indicates the time when the moisture content is the same as before the water control process was applied during production.

[0085] Changes in water production: n represents the production well time after the measure;

[0086] b) Water control in new wells:

[0087] Water control effective period: T = t(S) wt =S wpt ,S wlt )-t0,t(S wt =S wpt ,S wlt This indicates the time when the water cut is the same as that of the well being produced or compared with the water cut of the adjacent well after the application of the water control technology.

[0088] Changes in water production: (Compared with production schedule)

[0089] (Compared with neighboring wells);

[0090] 3) If K t >K0 (Old well water control), K t >K​​​pt or K t >K lt (Water control in new wells) The application of water control technology increased crude oil production, resulting in effective oil production increase (ΔQ). o >0), based on the comparison of changes in the oil recovery index, the effective period of water control T and the increase in oil production ΔQ are calculated using the following formulas respectively. o ;

[0091] a) Water control using old wells:

[0092] Water control effective period: T = t(K) t =K0)-t0,t(K t =K0) represents the time when the oil recovery index of rice is the same as that before water control during the production process after the application of the water control technology.

[0093] Increased fuel consumption: n represents the production well time after the measure, ΔP t ΔP0 represents the production pressure difference after the application of the water control technology, while ΔP0 represents the production pressure difference before the application of the water control technology in the old well.

[0094] b) Water control in new wells:

[0095] Water control effective period: T = t(K) t =K pt ,K lt )-t0,t(K t =K pt K lt This indicates the time when the water-controlled production index (MRI) is the same as that of the well in the production process after the application of the water control technology.

[0096] Increased fuel consumption: (Compared with production schedule)

[0097] (Compared with neighboring wells), ΔP pt Indicates the production pressure difference and ΔP of the target well for water control in the new well. lt This indicates the production pressure difference between the new well and adjacent wells at the same water control level.

[0098] ①If S wt >S w0 (Water control from the old well), S wt >S wpt or S wt >S wlt (Water control in new wells) After the application of water control technology, the water content increases, which increases the production of crude oil and water. The effect of water control needs to be comprehensively evaluated in conjunction with economic efficiency.

[0099] ②If S wt =S w0 (Water control from the old well), Swt =S wpt or S wt =S wlt (New well water control) After the water control technology is applied, the water content remains unchanged, but the actual water production increases. The water control effect needs to be comprehensively evaluated in conjunction with the economic benefits.

[0100] ③If S wt w0 (Water control from the old well), S wt wpt or S wt wlt (New well water control) After the water control technology is applied, the water cut decreases, but the actual water production can remain unchanged (ΔQ). w =0) or decrease (ΔQ) w <0), this operating condition is the most ideal situation for increasing oil and controlling water;

[0101] The change in permeable water ΔQ can be calculated using the following formula. w :

[0102] a) Water control using old wells:

[0103]

[0104] b) Water control in new wells:

[0105] Compared with production schedule: S wpi This represents the water cut at time i under the condition of controlled water production in a new well.

[0106] Comparison with neighboring wells: S wli This represents the water cut of the adjacent well at time i in the same stratum under the condition of water control by the new well.

[0107] Preferably, the process of evaluating the economic efficiency of single-well water control in step (6) includes: according to formula I wj (I wz )=ΔQ w ×i w I o =S o ×ΔQ o Calculate the increase in water treatment fee I due to the increase or decrease in water production, respectively, using ×6.2898×δ. wz Or reduce water treatment fees I wj Increase oil profits o Then, according to the formula ΔI = (I o +I wj )-(I tr +I wz Calculate the economic benefit ΔI (relationship between cost input and economic output) of single-well water control; ​​​

[0108] If ΔI > 0, there is a positive economic benefit and profit is made;

[0109] If ΔI < 0, there is a negative economic benefit and loss is incurred;

[0110] If ΔI = 0, there is a zero economic benefit and neither profit nor loss is made.

[0111] According to the present invention, preferably, the quantitative index system for water control effect of the horizontal well in step (7) includes the oil production index per meter, water cut, water control effective period, increased oil production, water production change amount and single - well benefit.

[0112] According to the present invention, preferably, it is characterized in that for the water control effect and economy of the horizontal well in step (7), only the water control with the premise of increasing or keeping the oil production by water control is effective, and the water control process sacrificing oil production by liquid limitation is ineffective; under the premise of increasing or stabilizing oil production, in the case of increasing, remaining unchanged or decreasing water production, it is necessary to comprehensively evaluate in combination with the economic benefit of single - well water control. When the economic benefit of single - well water control ΔI > 0, the corresponding water control process measures are considered effective.

[0113] Specifically, the quantitative index system and evaluation model for the water control effect of the horizontal well adopted in the present invention are established separately for water control in production old wells and new wells, and the specific derivation process is as follows:

[0114] (1) Water control in production old wells

[0115] 1) Operating parameters before and after measures

[0116] Before measures: Oil production index per meter K0: m 3 / (d·MPa·m); Daily oil production Q o0 : m 3 / d; Water cut S w0 : %;

[0117] After measures: Oil production index per meter K t : m 3 / (d·MPa·m); Daily oil production Q ot : m 3 / d; Water cut S wt : %。

[0118] 2) Establishment of quantitative evaluation model for water control effect

[0119] ① Case 1: If K t < K0, due to the application of the water control process, the crude oil production is reduced, which is contrary to the purpose of stabilizing oil production or increasing oil production by water control, and the application effect is poor, so the water control is ineffective.

[0120] ② Case 2: If K t=K0, the application of water control technology has no impact on crude oil production. In this case, it can be further divided into the following two situations based on the change in water cut before and after the measure:

[0121] If S wt ≧S w0 The water control process was ineffective because the moisture content increased instead of decreased after application.

[0122] If S wt w0 After the water control process was applied, the water content decreased, demonstrating effective water control. This process is considered a stable oil-water control method. A schematic diagram showing the water content change before and after water control is provided. Figure 2 As shown.

[0123] Depend on Figure 2 It can calculate the effective period of water control T and the change in water production ΔQ. w :

[0124]

[0125] Under this operating condition, ΔQ w <0 indicates that the water production rate has decreased after the application of the water control process.

[0126] ③ Case 3: If K t >K0, the application of water control technology increased crude oil production. A schematic diagram showing the changes in the oil recovery index before and after water control is shown below. Figure 3 As shown.

[0127] Depend on Figure 3 The effective period of water control (T) and the increase in oil production (ΔQ) can be calculated. o :

[0128] T = t(K) t =K0)-t0,

[0129]

[0130] Under this operating condition, ΔQ o A value >0 indicates that the oil production increased after the application of the water control process.

[0131] If S wt >S w0 After the application of water control technology, the water content increases, which increases the amount of water produced while increasing crude oil production. Further economic evaluation is needed.

[0132] If S wt =S w0 After the water control process is applied, the moisture content remains unchanged, but the actual water production increases, requiring further economic evaluation.

[0133] If S wt w0 ​​After the water control process is applied, the moisture content decreases, and the actual water production can remain unchanged (ΔQ). w =0) or decrease (ΔQ) w <0), this is the ideal condition for increasing oil and controlling water.

[0134] The change in permeable water ΔQ can be calculated using the following formula. w :

[0135]

[0136] (2) Water control in new wells

[0137] 1) Operating parameters of the water control well and the adjacent well for comparison

[0138] Water control well production conditions: Rice oil production index K pt :m 3 / (d.MPa.m); Nissan oil Q opt :m 3 / d; Moisture content S wpt :%;

[0139] Comparison of adjacent well conditions at the same oil column height and stratigraphic position: Oil production index K lt :m 3 / (d.MPa.m); Nissan oil Q olt :m 3 / d; Moisture content S wlt :%;

[0140] Production conditions after the application of water control technology: Rice Oil Extraction Index K t :m 3 / (d.MPa.m); Nissan oil Q ot :m 3 / d; Moisture content S wt :%;

[0141] 2) Establishment of a quantitative evaluation model for water control effect

[0142] ① Case 1: If K t <K pt or K t <K lt The application of water control technology reduces crude oil production, which contradicts the purpose of stabilizing oil production and controlling water or increasing oil production and controlling water. Therefore, the application effect is poor and the water control is ineffective.

[0143] ②Case 2: If K t =K pt or K t =K lt The application of water control technology has no impact on crude oil production. In this case, it can be further divided into the following two situations based on the comparison of water content:

[0144] If Swt ≧S wpt or S wt ≧S wlt The water control process was ineffective because the moisture content increased instead of decreased after application.

[0145] If S wt wpt or S wt wlt After the water control process was applied, the water content decreased, demonstrating effective water control. This process is considered a stable oil-water control method. A schematic diagram showing the water content change before and after water control is provided. Figure 4 As shown.

[0146] Depend on Figure 4 It can calculate the effective period of water control T and the change in water production ΔQ. w :

[0147] T = t(S) wt =S wpt ,S wlt )-t0,

[0148] Compared with production schedule:

[0149] Comparison with neighboring wells:

[0150] Under this operating condition, ΔQ w <0 indicates that the water production rate has decreased after the application of the water control process.

[0151] ③ Case 3: If K t >K pt or K t >K lt The application of water control technology increased crude oil production. A schematic diagram showing the changes in the oil recovery index before and after water control is shown below. Figure 5 As shown.

[0152] Depend on Figure 5 The effective period of water control (T) and the increase in oil production (ΔQ) can be calculated. o :

[0153] T = t(K) t =K pt ,K lt )-t0,

[0154] Compared with production schedule:

[0155] Comparison with neighboring wells:

[0156] Under this operating condition, ΔQ o A value >0 indicates that the oil production increased after the application of the water control process.

[0157] If S​​wt >S wpt or S wt >S wlt After the application of water control technology, the water content increases, which increases the amount of water produced while increasing crude oil production. Further economic evaluation is needed.

[0158] If S wt =S wpt or S wt =S wlt After the water control process is applied, the moisture content remains unchanged, but the actual water production increases, requiring further economic evaluation.

[0159] If S wt wpt or S wt wlt After the water control process is applied, the moisture content decreases, and the actual water production can remain unchanged (ΔQ). w =0) or decrease (ΔQ) w <0), this working condition is the most ideal situation for increasing oil and controlling water.

[0160] The change in permeable water ΔQ can be calculated using the following formula. w :

[0161] Compared with production schedule:

[0162]

[0163] Comparison with neighboring wells:

[0164]

[0165] (3) Economic evaluation of single-well water control

[0166] ①Evaluate basic parameters

[0167] Cost input or consumption: Water control cost: I tr Increase water treatment fees: I wz ;

[0168] Output benefits: Increased oil profit: I o Reduce water treatment costs: I wj .

[0169] ②Establishment of an economic evaluation model

[0170] Input-output relationship (economic benefits of single-well water control): ΔI=(I o +I wj )-(I tr +I wz ),

[0171] If ΔI>0, then there is positive economic benefit and money is made;​​

[0172] If ΔI < 0, then there is a negative economic benefit and a loss of money.

[0173] If ΔI = 0, then there is zero economic benefit, meaning neither profit nor loss.

[0174] Among them: I wj (I wz )=ΔQ w ×i w I o =S o ×ΔQ o ×6.2898×δ.

[0175] (4) Construction of a quantitative index system for water control effect of horizontal wells

[0176] Based on the above quantitative evaluation model of water control effect of horizontal wells, a quantitative index system of water control effect of horizontal wells can be summarized, and the specific indicators include oil production index, water cut, water control period, oil production increase, water production change and single well benefit.

[0177] In the formula:

[0178] K0, K t K pt K lt — These represent the oil recovery index (MRI) before water control measures were implemented in the old well, the MRI after water control measures were implemented in the target well, the MRI of the target well with water control measures and production allocation in the new well, and the MRI of the target well with water control measures compared to neighboring wells in the same formation. (m) 3 / (d.MPa.m);

[0179] Q o0 Q ot Q opt Q olt Q oi — These represent the daily oil production before water control measures were implemented in the old well, the daily oil production after water control measures were implemented in the target well, the daily oil production of the new well with water control measures, the daily oil production of the new well with water control measures compared to neighboring wells in the same formation, and the daily oil production at time i, respectively. 3 / d;

[0180] S w0 S wt S wpt S wlt S wi — These represent the water cut of the old well before water control measures, the water cut per meter of the target well after water control measures, the water cut of the new well with water control measures, the water cut of the target well with water control measures, the water cut of the new well with water control measures compared with the adjacent wells in the same stratum, and the water cut at time i, respectively, in %.

[0181] Q opi Q oli— These represent the daily oil production at time i and the daily oil production of adjacent wells in the same formation, respectively, under the condition of water control in a new well. 3 / d;

[0182] S wpi S wli — These represent the water cut at time i and the water cut of adjacent wells in the same formation, respectively, under the condition of water control by the new well, in %;

[0183] ΔQ w ΔQ o — These represent the change in water production and the increase in oil production, respectively, in m. 3 ;

[0184] T and t0 represent the effective period of water control and the initial time of production after water control, respectively, in hours;

[0185] t — represents the time (h) during the production process after the application of water control technology when the water cut or oil recovery index is the same as that before water control (water control in old wells), during production matching, or during comparison with neighboring wells (water control in new wells);

[0186] γ — Oilfield decline rate, %;

[0187] n—Production well duration after the measures, in years;

[0188] ΔP t , ΔP0, ΔP pt ΔP lt — These represent the production pressure difference after the application of water control technology, the production pressure difference before water control measures in old wells, the production pressure difference of the target well for water control in new wells, and the production pressure difference of adjacent wells in the same formation compared with water control in new wells, respectively, in MPa;

[0189] h、h p h l — These represent the reservoir thickness of the old well controlling water, the reservoir thickness of the new well controlling water in the target well, and the reservoir thickness of the new well controlling water in the same layer compared with the adjacent well, in meters;

[0190] I tr I wz I o I wj —These represent the costs of water control, increased water treatment fees, increased oil profits, and reduced water treatment costs, respectively, in ten thousand yuan;

[0191] ΔI—Economic benefits of water control from a single well, in ten thousand yuan;

[0192] i w —Unit water treatment cost, 10,000 yuan / ton;

[0193] S o —Oil price, in US dollars per barrel;

[0194] δ—RMB exchange rate.

[0195] Based on the quantitative index system and evaluation model for water control effect of horizontal wells, as a preferred specific implementation mode of the quantitative comprehensive evaluation method for oil stabilization and water control effect of horizontal wells in the present invention, the following steps are sequentially included:

[0196] (1) First, determine whether the water control target well is a production old well or a new well;

[0197] (2) According to whether it is a production old well or a new well, collect the relevant working condition parameters before and after the application of the water control process, during production or from adjacent wells with the same oil column height and the same layer, specifically including the oil production index per meter K0, K t 、K pt 、K lt , the daily oil production Q o0 、Q ot 、Q opt 、Q olt 、Q oi , the water cut S w0 、S wt 、S wpt 、S wlt , the oilfield decline rate γ, the reservoir thickness h, h p 、h l etc.;

[0198] (3) Collect the relevant parameters required for the economic benefit evaluation of single-well water control, mainly including the water control cost I tr 、the unit water treatment cost i w 、the oil price S o 、the RMB exchange rate δ, etc.;

[0199] (4) Conduct water control effect evaluation for production old wells or new wells respectively: For the water control effect evaluation of production old wells, mainly compare the production situations before and after the measures, and for the water control effect evaluation of new wells, mainly compare with the production allocation of this well or adjacent wells with the same oil column height and the same layer;

[0200] (5) Evaluate the water control effect through the comparison of the oil production index per meter and the water cut, and the specific process is as follows:

[0201] 1) If K t <K0 (for water control of old wells), K t <K pt or K t <K lt (for water control of new wells), because of the application of the water control process, the crude oil production is reduced (ΔQ o <0), which is contrary to the purpose of oil stabilization and water control or oil increase and water control, and the application effect is poor, and the water control is ineffective;

[0202] 2) If K t =K0 (for water control of old wells), Kt =K pt or K t =K lt (New well water control) The application of water control technology has no impact on crude oil production (ΔQ). o =0), in this case, it can be further divided into the following two situations based on the comparison of moisture content:

[0203] ①If S wt ≧S w0 (Water control from the old well), S wt ≧S wpt or S wt ≧S wlt (New well water control) After the water control technology was applied, the water content increased instead of decreasing, and the water control was ineffective;

[0204] ②If S wt w0 (Water control from the old well), S wt wpt or S wt wlt (New Well Water Control) After the application of the water control technology, the water cut decreased, indicating effective water control. This is considered stable oil production and water control. Based on the comparison of water cut changes, the effective period of water control (T) and the change in production water (ΔQ) are calculated using the following formulas. w ;

[0205] a) Water control using old wells:

[0206] Water control effective period: T = t(S) wt =S w0 )-t0,

[0207] Changes in water production:

[0208] b) Water control in new wells:

[0209] Water control effective period: T = t(S) wt =S wpt ,S wlt )-t0,

[0210] Changes in water production: (Compared with production schedule)

[0211] (Compared with neighboring wells);

[0212] 3) If K t >K0 (Old well water control), K t >K pt or K t >K lt (Water control in new wells) The application of water control technology increased crude oil production, resulting in effective oil production increase (ΔQ). o ​​​>0), based on the comparison of changes in the oil recovery index, the effective period of water control T and the increase in oil production ΔQ are calculated using the following formulas respectively. o

[0213] a) Water control using old wells:

[0214] Water control effective period: T = t(K) t =K0)-t0.

[0215] Increased fuel consumption:

[0216] b) Water control in new wells:

[0217] Water control effective period: T = t(K) t =K pt ,K lt )-t0,

[0218] Increased fuel consumption: (Compared with production schedule)

[0219] (Compared with neighboring wells),

[0220] ①If S wt >S w0 (Water control from the old well), S wt >S wpt or S wt >S wlt (Water control in new wells) After the application of water control technology, the water content increases, which increases the production of crude oil and water. The effect of water control needs to be comprehensively evaluated in conjunction with economic efficiency.

[0221] ②If S wt =S w0 (Water control from the old well), S wt =S wpt or S wt =S wlt (New well water control) After the water control technology is applied, the water content remains unchanged, but the actual water production increases. The water control effect needs to be comprehensively evaluated in conjunction with the economic benefits.

[0222] ③If S wt w0 (Water control from the old well), S wt wpt or S wt wlt (New well water control) After the water control technology is applied, the water cut decreases, but the actual water production can remain unchanged (ΔQ). w =0) or decrease (ΔQ) w <0), this operating condition is the most ideal situation for increasing oil and controlling water;

[0223] The change in permeable water ΔQ can be calculated using the following formula.​​​w :

[0224] a) Water control using old wells:

[0225]

[0226] b) Water control in new wells:

[0227] Compared with production schedule:

[0228] Comparison with neighboring wells:

[0229] (6) Economic evaluation of single-well water control: according to formula I wj (I wz )=ΔQ w ×i w I o =S o ×ΔQ o Calculate the increase or decrease in water treatment fees and oil profit caused by the increase or decrease in water production, respectively, using ×6.2898×δ; then calculate according to the formula ΔI=(I o +I wj )-(I tr +I wz Calculate the economic benefits of single-well water control (relationship between cost input and economic output);

[0230] If ΔI>0, then there is positive economic benefit and money is made;

[0231] If ΔI < 0, then there is a negative economic benefit and a loss of money.

[0232] If ΔI = 0, then there is zero economic benefit, resulting in neither profit nor loss;

[0233] (7) Comprehensive evaluation of water control effect: Using the oil production index, water cut, effective period of water control, increase in oil production, change in water production, and single-well benefit as the quantitative index system for water control effect of horizontal wells, and combining the calculation results of steps (1) to (6), the water control effect and economy of horizontal wells are comprehensively evaluated. See Figure 6 , Figure 7 As shown, only water control that increases or keeps oil production unchanged is considered effective; water control that sacrifices oil production by limiting liquid production is ineffective. At the same time, if the water production increases, remains unchanged, or decreases under the premise of increasing or stabilizing oil production, a comprehensive evaluation should be conducted in conjunction with the economic benefits of water control in a single well. Only when the economic benefits of water control in a single well ΔI>0 are the corresponding water control measures considered effective.

[0234] The invention will be further illustrated below with reference to examples and accompanying drawings.

[0235] A comprehensive quantitative evaluation method for the oil stabilization and water control effect of horizontal wells includes the following steps:

[0236] (1) First, determine whether the target well for water control is an old production well or a new well: take an old production well (X1 well, continuous packer water control) and a new well (X2 well, lightweight particle packing + ICD water control screen) as examples to conduct a quantitative comprehensive evaluation of the water control effect, and compare the production of X2 well with that of this well.

[0237] (2) Collect relevant operating parameters of water control technology before and after its application, and for production allocation, based on existing or new production wells:

[0238] ① Under the operating conditions of the old production well X1:

[0239] Before the measure: K0 = 0.58m 3 / (d.MPa.m), Q o0 =7m 3 / d、S w0 =99%, ΔP0 = 1.2 MPa;

[0240] After the measures: K t =2.03m 3 / (d.MPa.m), Q ot =34.46m 3 / d、S wt =79.57%, ΔP t =1.7MPa.

[0241] ②New well X2 well working conditions:

[0242] This well's production allocation: K pt =2m 3 / (d.MPa.m), Q opt =50m 3 / d、S wpt =85%, ΔP pt =2.5MPa;

[0243] Production after water control: K t =2.71m 3 / (d.MPa.m), Q ot =46m 3 / d、S wt =24%, ΔP t =1.7MPa.

[0244] (3) Collect relevant parameters required for evaluating the economic benefits of single-well water control, mainly including water control costs. tr Unit water treatment cost i w Oil prices o RMB exchange rate δ, etc.: I tr = 2 million yuan, iw =2 yuan / m 3 S o = $60 / barrel, δ = 6.5.

[0245] (4) The water control effect is evaluated separately for old production wells and new production wells: The evaluation of the water control effect of old production wells (X1 well) mainly compares the production situation before and after the measures, while the evaluation of the water control effect of new production wells (X2 well) compares the production of this well.

[0246] (5) Evaluate the water control effect by comparing the oil recovery index and water cut: By comparing the oil recovery index, K... t >K0(X1 well), and K t >K pt (Well X2) This indicates that the application of water control technology in wells X1 and X2 increased crude oil production, demonstrating the effectiveness of the oil production enhancement (ΔQ). o >0), based on the comparison of changes in the oil extraction index, calculate the effective period of water control T and the increase in oil production ΔQ respectively. o .

[0247] ① Water control at Old Well X1:

[0248] Water control validity period: T = 142 days;

[0249] Increase in fuel consumption: ΔQ o =1939.60m 3 ;

[0250] ②Xinjing X2 well water control:

[0251] Water control validity period: T = 191 days;

[0252] Increased oil production (compared to production allocation): ΔQ o =113.68m 3 ;

[0253] Meanwhile, by comparing the changes in water cut curves, the change in water production ΔQ of wells X1 and X2 was calculated. w They are -81212.18m respectively. 3 1784.90m 3 This indicates that the water production of well X1 decreased by 81212.18 m³ after the application of the water control technology. 3 After the application of the water control technology in well X2, the water production increased by 1784.90 m³ compared with the production data. 3 .

[0254] (6) Economic evaluation of single-well water control: according to formula I wj (I wz )=ΔQ w ×i w I o =S o ×ΔQo Calculate the increase or decrease in water treatment fees and oil profit caused by the increase or decrease in water production, respectively, using ×6.2898×δ; then calculate according to the formula ΔI=(I o +I wj )-(I tr +I wz Calculate the economic benefits of water control in a single well (the relationship between cost input and economic output).

[0255] ① Water control at Old Well X1:

[0256] Input costs: I tr =1.7 million yuan;

[0257] Economic output: I o =4,757,900 yuan, I wj =182,400 yuan;

[0258] Economic benefits of single-well water control: ΔI = 3.2403 million yuan.

[0259] ②Xinjing X2 well water control:

[0260] Input costs: I tr = 2 million yuan, I wz =03600 yuan;

[0261] Economic output: I o =278,900 yuan;

[0262] Economic benefits of single-well water control: ΔI = -1,724,700 yuan.

[0263] (7) Comprehensive evaluation of water control effect: Using the oil production index, water cut, effective period of water control, increase in oil production, change in water production, and single-well benefit as the quantitative index system for water control effect of horizontal wells, and combining the calculation results of steps (1) to (6), the water control effect and economy of horizontal wells are comprehensively evaluated. See Figure 8 , Figure 9 As shown.

[0264] ① Water control in old well X1: Water control effective period 142 days, increased oil production 1939.60m³ 3 Water production decreased by 91212.18m³ 3 This method involves increasing oil production and controlling water, with effective water control resulting in an additional profit of 3.2403 million yuan per well.

[0265] ② Water control in the new X2 well: effective water control period of 191 days, increased oil production of 113.68m³. 3 Water production increased by 1784.90 m³ 3The well was classified as a case of increasing oil production without controlling water production. The actual water production increased. Based on the economic benefit evaluation of the single well, the well incurred a loss of 1.7247 million yuan during the effective period of water control due to the application of water control technology, and the water control was ineffective.

[0266] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, and the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be considered as part of the content disclosed in this invention and are all within the protection scope of this invention.

Claims

1. A quantitative comprehensive evaluation method for the oil stabilization and water control effect of horizontal wells, characterized in that, The method includes the following steps: (1) Determine whether the target well for water control is an old producing well or a new well; (2) Based on the old or new production wells, collect relevant operating parameters of the water control technology before and after its application, as well as the production of adjacent wells at the same oil column height and layer. These parameters include the meter production index, daily oil production, water cut, and oilfield decline rate. γ Reservoir thickness; (3) Collect relevant parameters required for evaluating the economic benefits of water control in a single well, including water control costs. I tr Unit water treatment cost i w Oil prices S o RMB exchange rate δ ; (4) Evaluate the water control effect of old production wells and new production wells respectively. The evaluation of the water control effect of old production wells includes: comparing the production situation before and after the application of the water control technology; the evaluation of the water control effect of new wells includes: comparing the new well with the production of the same well or with adjacent wells of the same oil column height and layer. (5) By comparing the oil production index and water cut, the impact of water control technology on oil production and water production is evaluated using index parameters including the effective period of water control, oil production increase and water production change, and then the water control effect is evaluated. The effective period of water control for old production wells is determined by comparing the water cut changes before and after the measures, and the effective period of water control for new wells is determined by comparing the water cut changes of adjacent wells. (6) Evaluate the economic efficiency of single-well water control for effective production wells or new wells based on the water control effect; (7) The water control effect of horizontal wells is comprehensively evaluated by taking the oil production index, water cut, water control period, oil production increase, water production change and single well benefit as quantitative index system. Combined with the calculation results of steps (1) to (6), the water control effect and economy of horizontal wells are evaluated.

2. The method according to claim 1, characterized in that, The oil recovery index in step (2) includes the oil recovery index before the application of water control technology in old production wells. K 0. Oil recovery index of target wells after application of water control technology K t New well water control target well production per meter oil index K pt Compared with the target well for water control in the same formation, the oil recovery index of adjacent wells was [data missing]. K lt ; Nissan oil includes Nissan oil produced before the application of water control technology in old production wells. Q o0 Daily oil production after the application of water control technology in target wells Q ot New well water control target well production daily oil production Q opt Daily oil production of adjacent wells compared with the target well for water control in the same formation. Q olt and its i Nissan oil at any time Q oi ; Moisture content includes the moisture content before the application of water control technology in old production wells. S w0 Water cut per meter after application of water control technology in target wells S wt New well water control target well production water cut S wpt Water cut of the target well in the same formation as the new well (compared with adjacent wells) S wlt and its i Moisture content at time S wi ; Reservoir thickness includes the reservoir thickness of old production wells and water-controlling wells. h New well water control target well reservoir thickness h p Comparison of reservoir thickness in adjacent wells with water control in the same stratigraphic position of the new well h l .

3. The method according to claim 2, characterized in that, The process of evaluating the water control effect in step (5) includes: 1) After the application of water control technology in old wells, if K t < K 0. After the application of the new well water control technology, if K t < K pt or K t < K lt Because of the application of water control technology, crude oil production was reduced, i.e., Δ Q o <0, which contradicts the purpose of stabilizing oil and controlling water or increasing oil and controlling water, has poor application effect and is ineffective in controlling water; 2) After the application of water control technology in old wells, if K t = K 0. After the application of the new well water control technology, if K t = K pt or K t = K lt The application of water control technology has no impact on crude oil production, i.e., Δ Q o =0, in this case, it can be further divided into the following two situations based on the comparison of moisture content: ① After the application of water control technology in old wells, if S wt ≧ S w0 If the new well water control technology is applied S wt ≧ S wpt or S wt ≧ S wlt The water control process was ineffective because the moisture content increased instead of decreased after application. ② After the application of water control technology in old wells, if S wt < S w0 If the new well water control technology is applied S wt < S wpt or S wt < S wlt After the water control process is applied, the water content decreases, indicating effective water control. This is considered a stable oil-water control process. Based on the comparison of water content changes, the effective period of water control is calculated using the following formulas. T and the change in water production Δ Q w ; a) Water control using old wells: Water control validity period: , t 0 indicates the initial moment of production after water control. This indicates the time elapsed during production after the application of the water control process, when the moisture content is the same as before water control. Changes in water production: n represents the production well time after the measure; b) New well water control: Water control validity period: , This indicates the time when the water cut is the same as that of the well being produced or compared with the water cut of the adjacent well after the application of the water control technology. Changes in permeable volume: when compared with production schedule , When comparing with neighboring wells ; 3) After the application of water control technology in old wells, if K t > K 0. After the application of the new well water control technology, if K t > K pt or K t > K lt The application of water control technology increased crude oil production, resulting in effective oil enhancement, i.e., Δ Q o >0, based on the comparison of changes in the oil extraction index, the effective period of water control is calculated using the following formulas. T And the increase in oil volume Δ Q o ; a) Water control using old wells: Water control validity period: , This indicates the time when the oil recovery index of rice is the same as that before water control during the production process after the application of the water control technology. Increased fuel consumption: , n represents the production well time after the measure, Δ P t Δ represents the production pressure difference after the application of the water control process. P 0 represents the production pressure difference before the application of the old well water control technology; b) New well water control: Water control validity period: , This indicates the time when the water-controlled production index (MRI) is the same as that of the well in the production process after the application of the water control technology. Increased fuel consumption: when compared with production allocation , When comparing with neighboring wells Δ P pt Indicates the production pressure difference and Δ of the target well for water control in new wells. P lt This indicates the production pressure difference between the new well and adjacent wells at the same water control level. ① After the application of water control technology in old wells, if S wt > S w0 If the new well water control technology is applied S wt > S wpt or S wt > S wlt After the application of water control technology, the water content increases, which increases crude oil production but also water production. The effect of water control needs to be comprehensively evaluated in conjunction with economic efficiency. ② After the application of water control technology in old wells, if S wt =S w0 If the new well water control technology is applied S wt =S wpt or S wt =S wlt After the water control process is applied, the moisture content remains unchanged, but the actual water production increases. The water control effect needs to be comprehensively evaluated in conjunction with the economic benefits. ③ After the application of water control technology in old wells, if S wt <S w0 If the new well water control technology is applied S wt <S wpt or S wt <S wlt After the water control process is applied, the moisture content decreases, but the actual water production can remain unchanged, i.e., Δ Q w =0, or decrease, i.e., Δ Q w <0, this is the ideal condition for increasing oil production and controlling water; The change in water production Δ can be calculated using the following formula. Q w : a) Water control using old wells: ； b) New well water control: Compared with production schedule: , S wpi Indicating water control in new wells i The corresponding moisture content for production at that time. Comparison with neighboring wells: , S wli Indicating water control in new wells i The water cut of adjacent wells at the same stratum at the given time.

4. The method according to claim 3, characterized in that, The process of evaluating the economic efficiency of single-well water control in step (6) includes: according to the formula I wj ( I wz )=Δ Q w × i w , I o = S o ×Δ Q o ×6.2898× δ Calculate the increase in water treatment fees due to an increase or decrease in water production. I wz Or reduced water treatment fees I wj and increase oil profits I o Then, according to the formula Δ I =( I o + I wj )-( I tr + I wz ) Calculate the economic benefits Δ of water control from a single well I That is, the relationship between cost input and economic output; If Δ I If the value is greater than 0, then the economic benefit is positive, and money is made; If Δ I If the value is less than 0, then there is a negative economic benefit and a loss of money. If Δ I = 0, then there is zero economic benefit, neither profit nor loss.

5. The method according to claim 4, characterized in that, The quantitative index system for water control effect of horizontal wells mentioned in step (7) includes the oil production index, water cut, effective period of water control, increase in oil production, change in water production, and single well benefits.

6. The method according to claim 5, characterized in that, In step (7), the water control effect and economy of horizontal wells are only effective if the water control increases or remains unchanged in oil production. Water control technology that sacrifices oil production by limiting liquid is ineffective. Under the premise of increasing or stabilizing oil production, if water production increases, remains unchanged, or decreases, a comprehensive evaluation should be conducted based on the economic benefits of water control in a single well. When the economic benefits of water control in a single well Δ I Water control measures are considered effective only when the value is greater than 0.

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