Shale oil well channeling prevention and yield increase method and device

Abstract

The invention discloses an anti-channeling and yield-increasing method for a shale oil well. The method comprises the steps that the energy storage level of the current stage is determined according to the fracturing fluid amount of a tampered well and the current fluid production amount; determining an anti-channeling yield increasing scheme according to the energy storage level of the tampered well at the current stage; and executing the determined anti-channeling and yield-increasing scheme on the tampered well so as to carry out anti-channeling and yield-increasing.

Description

Technical Field

[0001] This article relates to the field of oil and gas field development technology, and in particular to a method and device for preventing cross-flow and increasing production in shale oil wells. Background Technology

[0002] In shale oil reservoir development, a multi-horizontal-well volumetric fracturing and three-dimensional production method is commonly used. During fracturing well construction, varying degrees of interference between fracturing wells and adjacent wells have occurred. Due to the long production and development time of adjacent wells, the formation pressure decreases, leading to changes in the surrounding effective stress. Simultaneously, the heterogeneous mechanical properties of the reservoir rock further exacerbate the interference. This interference affects the cementing safety of adjacent wells, resulting in increased pressure, increased water cut, and decreased oil production. In some older wells, pressure increases ranged from 6.9 to 40.4 MPa, and oil production decreases reached 51.9% to 89.5%. Simultaneously, it negatively impacts the fracturing effect of the fracturing wells due to fracturing fluid loss, leading to unsatisfactory fracturing results. Shale oil development is increasingly valued worldwide and is becoming an important direction for future energy replacement. Therefore, ensuring the protection of production from potentially disturbed wells during fracturing while simultaneously ensuring the fracturing effect of the fracturing wells urgently requires effective prevention and control measures. Summary of the Invention

[0003] The purpose of this invention is to provide a method for preventing cross-flow and increasing production in shale oil wells. This method is applied to inject a replenishing fluid containing a production-enhancing medium into a potentially cross-flowing well before fracturing a new well to increase pressure and prevent cross-flow, thereby reducing the risk of cross-flow. At the same time, the production-enhancing medium in the replenishing fluid can play a role in increasing production, achieving the dual effect of preventing cross-flow and increasing production rate.

[0004] In a first aspect, this application provides a method for preventing cross-contamination and increasing production in shale oil wells, the method comprising:

[0005] The energy storage level of the disturbed well at its current stage is determined based on the fracturing fluid volume and the current production volume of the disturbed well.

[0006] Determine the anti-channeling and production enhancement plan based on the current energy storage level of the disturbed well;

[0007] The established anti-crossing and production enhancement plan is implemented for the wells that have been disturbed, in order to prevent cross-crossing and increase production.

[0008] Optionally, the current energy storage level of the disturbed well is:

[0009]

[0010] Among them, V F Q represents the amount of fracturing fluid in the disturbed well. P E represents the production rate of the disturbed well. S This represents the current energy storage level.

[0011] Optionally, determining the anti-channeling and production enhancement scheme based on the current energy storage level of the disturbed well includes:

[0012] Based on the current energy storage level of the disturbed well, the first anti-channeling and production enhancement scheme is determined to be adopted;

[0013] Based on the fracturing fluid volume and production volume of the disturbed well, determine the amount of replenishing fluid used in the first anti-channeling and production enhancement scheme;

[0014] Based on the determined amount of replenishing fluid and the production-boosting media in the first anti-channeling and production-increasing scheme, determine the amount of each production-boosting media.

[0015] Optionally, the first anti-counterfeiting and production-increasing scheme includes:

[0016] If the current energy storage level of the disturbed well is 80% ≤ E S <90%, use production-enhancing media to increase the energy storage level of the disturbed well to 90%;

[0017] If the potential energy storage level of the disturbed well is E S <60%, using production-enhancing media to increase the energy storage level of the disturbed well to between 80% and 90%.

[0018] Optionally, the amount of energy replenishing fluid used in the first anti-channeling and production-increasing scheme includes:

[0019] If the current energy storage level of the disturbed well is 80% ≤ E S When <90%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is:

[0020] Q I = (90% - E) S V F ;

[0021] In the above formula, Q I To increase the total amount of production media used, E S V represents the current energy storage level of the disturbed well. F The amount of fracturing fluid in the disturbed well.

[0022] Optionally, the amount of energy replenishing fluid used in the first anti-channeling and production-increasing scheme includes:

[0023] If the potential energy storage level of the disturbed well is E S When <60%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is:

[0024] Q I =(cE S V F

[0025] In the above formula, the value of c ranges from 80% to 90%.

[0026] Optionally, determining the anti-channeling and production enhancement scheme based on the current energy storage level of the disturbed well includes:

[0027] If the current energy storage level of the disturbed well is 80% ≤ E S <90%, therefore the second anti-crossing and production-increasing plan will be adopted;

[0028] Based on the fracturing fluid volume and production volume of the disturbed well, the total amount of replenishing fluid and water replenishment in the second anti-channeling and production enhancement scheme are determined respectively.

[0029] Optionally,

[0030] The second anti-channeling and production-increasing scheme is as follows:

[0031] The energy storage level of the disturbed well is increased to within the range of value b by using a production-enhancing medium;

[0032] After reaching the predetermined range, the energy storage level of the disturbed well is increased to 90% using the replenishment water volume. Optionally, the total amount of replenishment fluid used in the second anti-channeling and production enhancement scheme is:

[0033] Q I =(bE S V F

[0034] The water replenishment amount in the second anti-crossing and production-increasing plan is:

[0035] Q W = (90% - b)V F

[0036] Wherein, the value of b ranges from 80% to 90%. W This refers to the amount of water to be replenished.

[0037] Secondly, embodiments of the present invention provide a shale oil well anti-channeling and production enhancement device, characterized in that the device includes: a memory and a processor; the memory is used to store a shale oil well anti-channeling and production enhancement program, and the processor is used to read and execute the shale oil well anti-channeling and production enhancement program, and execute the method described in any one of the above embodiments.

[0038] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a data processing program, wherein the data processing program is executed by a processor using the shale oil well anti-channeling and production enhancement method described in any of the above embodiments.

[0039] Compared with related technologies, this application provides a method for preventing cross-flow and increasing production in shale oil wells. The method includes: determining the current energy storage level based on the fracturing fluid volume and current production volume of the well being cross-flowed; determining an anti-cross-flow and production enhancement scheme based on the current energy storage level of the well being cross-flowed; and implementing the determined anti-cross-flow and production enhancement scheme on the well being cross-flowed to achieve anti-cross-flow and production enhancement. Before fracturing a new well, this application injects a replenishing fluid containing a production-enhancing medium into the potentially cross-flowed well to increase pressure and prevent cross-flow, reducing the risk of cross-flow. Simultaneously, the production-enhancing medium in the replenishing fluid can play a role in increasing production, achieving a dual effect of preventing cross-flow and improving production rate.

[0040] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the solutions described in the description and the accompanying drawings. Attached Figure Description

[0041] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0042] Figure 1 This is a flowchart of the shale oil well anti-channeling and production enhancement method according to an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of a shale oil well anti-channeling and production enhancement device according to an embodiment of this application;

[0044] Figure 3 This is a schematic diagram showing the location of wells in a shale oil production suppression interference group in an exemplary embodiment;

[0045] Figure 4 This is a schematic diagram of well placement in an exemplary embodiment;

[0046] Figure 5 This is a pressure fluctuation monitoring diagram after recharging of a disturbed well in an exemplary embodiment;

[0047] Figure 6 This is a production profile after recharging of a potentially disturbed well, as shown in an exemplary embodiment. Detailed Implementation

[0048] This application describes several embodiments, but these descriptions are exemplary and not restrictive, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0049] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive scheme as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive schemes to form another unique inventive scheme as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this application may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0050] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims concerning the method and / or process should not be limited to the steps performed in the written order, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.

[0051] Invention patent CN202310806614.8 discloses a method and system for suppressing hydraulic channeling in shale gas horizontal wells through refined fracturing. It applies a pre-designed, ongoing multi-cluster hydraulic fracturing scheme for shale gas horizontal wells, including the following steps: real-time tracking and adjustment of fracturing parameters; real-time monitoring of whether hydraulic channeling occurs during the fracturing process; if hydraulic channeling occurs, determining whether the fracturing has entered the temporary plugging stage; if it has, employing pump shutdown and diversion techniques and / or high-concentration sand plugging techniques based on the severity of the channeling; if it has not entered the temporary plugging stage, initiating the temporary plugging stage earlier than the fracturing scheme, and employing pump shutdown and diversion techniques and / or high-concentration sand plugging techniques based on the severity of the channeling. This method relies on real-time monitoring data to determine whether hydraulic channeling has occurred and then implements corresponding control measures, which is a reactive measure and fails to achieve pre-emptive prevention.

[0052] Invention patent CN202311573154.5 discloses a method for volumetric fracture control and prevention of hydraulic channeling in shale formations. First, the fracturing risk of different reservoirs is assessed. The hydraulic channeling risk coefficient FH is calculated using the formula, and the reservoirs are classified into three risk levels: low, medium, and high. Then, different anti-channeling technologies are implemented for each risk level. In high-risk sections, selective strong sealing and sand filling are used to prevent hydraulic channeling. The sealing and sand filling is selected based on the regional construction plan to control the seepage rate of old fractures and maintain injection pressure, preventing hydraulic channeling during subsequent well fracturing. In medium-risk sections, enhanced anti-channeling sealing is used to create artificial fractures and promptly redirect them to moderately connect with natural fractures. Timely sealing and control of artificial fractures prevents excessive extension along natural fractures. In low-risk sections, enhanced anti-channeling and thorough modification are implemented to prevent excessive extension of artificial fractures along bedding and micro-fractures. Underdeveloped fracture sections are fully modified, and monitoring is strengthened during fracturing to prevent timely channeling. This method starts with fractured wells and implements different anti-channeling technology schemes according to the channeling risk coefficient. However, it is only an anti-channeling method at the end of the fractured well and cannot achieve active channeling suppression and production increase in old wells.

[0053] Invention patent CN202111546958.7 discloses a method for predicting inter-well connectivity during fracturing operations and a method for preventing hydraulic channeling. The method for predicting inter-well connectivity during fracturing operations includes the following steps: determining the main controlling factors affecting inter-well connectivity, and establishing a mathematical model for predicting inter-well connectivity using these as independent variables; classifying the risk of inter-well connectivity into three levels—high risk, medium risk, and low risk—based on the probability of inter-well connectivity occurring; acquiring the values ​​of the main controlling factors in real time during fracturing operations, obtaining the probability of inter-well connectivity occurring at the current fracturing stage through the mathematical model, and determining the corresponding risk level. The method for preventing hydraulic channeling obtains the risk segment of inter-well connectivity by predicting the occurrence of inter-well connectivity during fracturing operations, and designs a temporary plugging pressure based on the optimal temporary plugging design pressure according to the risk level corresponding to the risk segment. This method starts from the fracturing well and designs a temporary plugging pressure based on the risk of inter-well connectivity, but it is only a method for preventing channeling at the fracturing well end and cannot achieve active suppression of channeling and production improvement in older wells.

[0054] Regarding the methods described above, the inventors have concluded that existing methods for preventing crosstalk in shale oil well fracturing primarily consider fracturing design, fracturing technology, and construction management, failing to guarantee that production in older wells will not be affected. Therefore, it is necessary to develop comprehensive anti-crosstalk technical strategies based on the locational relationship between the fracturing well and the production volume of the older well, forming a method for preventing crosstalk and increasing shale oil well production. This approach can guarantee the production of potentially affected wells while also ensuring the fracturing effect of the fracturing well.

[0055] This invention provides a method for preventing cross-contamination and increasing production in shale oil wells, such as... Figure 1 As shown, the method includes steps S100-S120:

[0056] S100: Determine the energy storage level at the current stage based on the fracturing fluid volume and current production volume of the disturbed well;

[0057] S110: Determine an anti-channeling and production enhancement plan based on the current energy storage level of the disturbed well;

[0058] S120: Implement the determined anti-crossing and production enhancement plan for the disturbed well to prevent crossing and increase production.

[0059] In one exemplary embodiment, the current stage energy storage level E of the disturbed well is determined. S for:

[0060]

[0061] Among them, V F Q represents the amount of fracturing fluid in the disturbed well. P This represents the production volume of a potentially disturbed well.

[0062] The fracturing fluid volume of the aforementioned disturbed well can be found in the well's records, and the production volume of the disturbed well can be found in the well's production data table. S This represents the current energy storage level of the disturbed well.

[0063] In one exemplary embodiment, determining an anti-channeling and production enhancement scheme for the disturbed well based on its current energy storage level includes:

[0064] Scenario 1: If the current energy storage level E of the disturbed well is... S If the level is ≥90%, then no energy replenishment fluid is needed.

[0065] Scenario 2: If the current energy storage level of the disturbed well is 80% ≤ E S If the energy storage level of the disturbed well is less than 90%, then the total amount of production-enhancing medium used will be used to increase the energy storage level of the disturbed well to 90%.

[0066] Scenario 3: If the potential well storage level is 60% ≤ E S If the energy storage level is less than 80%, then production-enhancing media and water replenishment will be used to increase the energy storage level of the disturbed well to 90%.

[0067] Scenario 4: If the potential well storage level E is affected by crosstalk S <60%, the energy storage level of the disturbed well must reach 80% after replenishment using production-enhancing media.

[0068] In one exemplary embodiment, a production-enhancing medium is injected into a potentially disturbed well. This replenishing medium includes both production-enhancing media and water. The replenishing medium may include gas, water, chemicals, etc., and is not specifically limited thereto. All replenishing media in this art are within the scope of protection of this embodiment.

[0069] In one exemplary embodiment, determining an anti-channeling and production enhancement scheme based on the current stage energy storage level of the disturbed well includes:

[0070] Step 1: Based on the current energy storage level of the disturbed well, determine the first anti-channeling and production enhancement scheme to be adopted;

[0071] In this step, the first anti-channeling and production enhancement scheme involves using a production-boosting medium to raise the energy storage level of the disturbed well to a predetermined level. Specific operations for different situations are as follows:

[0072] 1. If the current energy storage level of the disturbed well is 80% ≤ E S <90%, use production-enhancing media to increase the energy storage level of the disturbed well to 90%;

[0073] II. If the potential well storage level E is disturbed S<60%, using production-enhancing media to increase the energy storage level of the disturbed well to between 80% and 90%.

[0074] Step 2: Determine the amount of replenishing fluid used in the first anti-channeling and production enhancement scheme based on the fracturing fluid volume and production volume of the disturbed well.

[0075] If the current energy storage level of the disturbed well is 80% ≤ E S When <90%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is:

[0076] Q I = (90% - E) S V F ;

[0077] In the above formula, Q I To increase the total amount of production media used, E S V represents the current energy storage level of the disturbed well. F The amount of fracturing fluid in the disturbed well.

[0078] If the potential energy storage level of the disturbed well is E S When <60%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is:

[0079] Q I =(cE S V F

[0080] In the above formula, the value of c ranges from 80% to 90%.

[0081] Step 3: Based on the determined amount of replenishing fluid and the production-boosting media in the first anti-channeling and production-increasing scheme, determine the amount of each production-boosting media.

[0082] The relationship between the amount of each production-enhancing medium used and the total amount of production-enhancing medium used is as follows:

[0083]

[0084] Q i Q represents the amount of the i-th production-enhancing medium used. I To increase the total amount of production medium used.

[0085] In one exemplary embodiment, determining the anti-channeling and production enhancement scheme based on the current stage energy storage level of the disturbed well includes:

[0086] Step 1: If the current energy storage level of the disturbed well is 80% ≤ E S If the yield is less than 90%, the second anti-channeling and production-increasing scheme will be adopted. The second anti-channeling and production-increasing scheme uses two methods: production-boosting medium and water.

[0087] The second step is to determine the total amount of replenishing fluid and water replenishment in the second anti-channeling and production enhancement scheme based on the fracturing fluid volume and production volume of the disturbed well.

[0088] In one exemplary embodiment, the second anti-counterfeiting and production-increasing scheme is as follows:

[0089] The energy storage level of the disturbed well is increased to within the range of value b by using a production-enhancing medium;

[0090] After the energy storage level of the disturbed well is raised to a predetermined range, the energy storage level of the disturbed well is increased to 90% by using the replenishment water.

[0091] In one exemplary embodiment, the total amount of replenishing fluid used in the second anti-channeling and production-increasing scheme is:

[0092] Q I =(bE S V F

[0093] The water replenishment amount in the second anti-crossing and production-increasing plan is:

[0094] Q W = (90% - b)V F

[0095] Where b takes values ​​ranging from 80% to 90%, Q W This refers to the amount of water to be replenished.

[0096] In one exemplary embodiment, after determining the energy enhancement and anti-channeling production increase scheme for the disturbed well, the following steps are further performed:

[0097] The first step is to determine the energy enhancement and anti-channeling production improvement plan for the wells that are potentially affected by channeling. This plan includes, but is not limited to: reservoir geological overview of the well group, communication possibility analysis, energy replenishment fluid usage design, production improvement medium selection and usage design, injection and production process and parameter design, and monitoring plan.

[0098] The second step is to inject replenishing fluid or production-boosting medium. Based on the capacity enhancement and anti-channeling production-boosting plan, on-site construction is carried out to inject the replenishing fluid.

[0099] The third step is to carry out fracturing in the fracturing well. After the energy replenishment fluid is injected into the potentially disturbed well, fracturing operations can be carried out in the fracturing well. During this period, the pressure of the potentially disturbed well should be closely monitored. Any abnormal increase should be reported immediately, and the fracturing well construction plan should be adjusted in a timely manner.

[0100] Step 4: Resume Production. Once the fracturing well is completed and the potentially disrupted wells have been shut down for the designed period, the well group will work together to resume production.

[0101] The method for preventing cross-contamination and increasing production in shale oil wells implemented in this embodiment has the following technical effects:

[0102] By pre-injecting a replenishing fluid containing a production-enhancing medium into potentially disturbed wells, a pressure barrier is established, effectively reducing crosstalk during production. At the same time, the production-enhancing medium in the replenishing fluid is beneficial for shale oil production, achieving the dual effects of preventing crosstalk and increasing production rate.

[0103] Secondly, embodiments of the present invention provide a shale oil well anti-channeling and production enhancement device, such as... Figure 2 As shown, the device includes a memory 200 and a processor 210; the memory is used to store a shale oil well anti-channeling and production enhancement program, and the processor is used to read and execute the shale oil well anti-channeling and production enhancement program, and execute the method described in any of the above embodiments.

[0104] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a data processing program, wherein the data processing program is executed by a processor according to any one of the above embodiments for the method of preventing cross-cutting and increasing production in shale oil wells.

[0105] Example 1

[0106] To more clearly illustrate the shale oil well anti-channeling and production enhancement method provided by this invention, taking the pressure-production well group in test area X as an example, as follows: Figure 3 The diagram shows the location of wells in the shale oil production control group that may be affected by cross-contamination. The specific implementation steps for shale oil well anti-cross-contamination and production enhancement methods for potentially affected wells are as follows:

[0107] Step 1: Analyze the form and location of natural fractures between the fractured well and the potentially convective well. Analysis confirmed that there are no natural fractures connecting the fractured well and the potentially convective well.

[0108] Step 2: Based on the direction of geostress and the mechanical properties of rock, and according to the design of the hydraulic fracturing construction process, the predicted direction of the fracture opening is northeast-southwest, the fracture height is 20m, and the fracture length is 86-94m.

[0109] Step 3: Obtain fracture simulation data from the fractured well and geochemical index data, rock mechanics data, fracturing operation data, fracture monitoring data, descriptions of previous operations, fluid property data, pressure, production history data, etc., from potentially disturbed wells; such as Figure 5 As shown, this is a monitoring diagram of pressure fluctuations in a potentially disturbed well.

[0110] like Figure 4 As shown, the test well is an old well in this well group, and it has communication with the adjacent old wells 2# and 3# through hydraulic fracturing fractures.

[0111] (1) Geochemical parameters and temperature and pressure data: The vertical depth of the test well is 3750m, and the original formation pressure is...

[0112] The formation pressure is 50.6 MPa, the formation temperature is 140℃, the average S1* value is 7.99 mg / g, and the relative content of clay minerals is 27.9%.

[0113] (2) Fluid properties: The density of crude oil at the surface is 0.8727 g / cm³. 3 The crude oil viscosity at 50℃ is 67.89 mPa·s, with an average wax content of 21.37% and an average gum content of 13.8%, classifying it as a medium-light, low-viscosity crude oil.

[0114] (3) Fracturing parameters and fracture monitoring data: Fracturing fluid volume was 22547 m³. 3 Rice liquid volume 40.92m 3 / m, sand content 2.44m 3 / m; the cracks open in the northeast-southwest direction and are 30-156m long.

[0115] (4) Production data: Before the test, the pumping unit was producing oil with an oil casing pressure of 0.54 / 0.60 MPa and a daily fluid production of 4.38 m³. 3 Daily oil production is 3.5 tons, with a water content of 21.2%, and a cumulative liquid production of 11,327 cubic meters. 3 .

[0116] Step 4: Determine the range of energy replenishment.

[0117] Based on the location relationship between wells and the research data from steps one, two, and three, the possibility of communication and crosstalk between the fractured well and the adjacent oil well is predicted, and the effective range of the replenishing fluid is determined.

[0118] Based on the location relationship of the well group, the range of energy replenishment is the area radially extended from the test well to the newly drilled well and the old well #2.

[0119] Step 5: Determine the current energy storage level of potential wells that may be disturbed.

[0120] Based on the fracturing fluid volume V of the potentially disturbed well F Liquid production Q P The current energy storage level is calculated to be E. S It is 49.76%.

[0121]

[0122] Step Six: Determine the total amount of energy replenishing solution required (Q) E .

[0123] Analysis reveals that the current energy storage level E of the test well is... S <60%, according to the production patterns of shale oil wells, this energy storage level well is almost in a low-production stage, therefore only the production-boosting medium needs to be injected, and the energy replenishing fluid Q needs to be injected. EAfter replenishment, the energy storage level must reach 80%. The replenishment fluid injection volume is calculated to be 6818 m³ using the following formula. 3 .

[0124] Using the formula: Q I =(c-ES)V F

[0125] In the above formula, if c takes the value of 80%, then:

[0126] Q I =(cE S V F = (80% - 49.76%) × 22547 = 6818.

[0127] Step 7: Design the energy replenishment fluid combination.

[0128] Based on the data obtained in steps three through six, the analysis indicates that this well has potential for further production increases. The well is designed to adopt an implementation mode of "carbon dioxide + surfactant solution huff and puff for increased production + energy replenishment and pressure boosting to prevent cross-contamination." The energy replenishment fluid is designed as a combination of carbon dioxide and surfactant solution, with a carbon dioxide dosage Q1 of 818 m³. 3 The amount of surfactant solution used, Q2, is 6000 mg / mL. 3 .

[0129] Step 8: Design the energy replenishment fluid injection sequence.

[0130] Based on the data obtained in step three, the analysis shows that the old well #1, which is potentially disturbed, is in the category of low-production wells. The main reasons for the low production are insufficient formation energy, reduced production pressure differential, and poor fluid supply capacity. Considering that the previous implementation of carbon dioxide huff and puff in the adjacent well #2 achieved good results, carbon dioxide was injected into this well first, followed by the injection of surfactant solution to replenish energy to 80%.

[0131] Step 9: Develop a production enhancement and anti-channeling plan for Well #1.

[0132] Step 10: In accordance with the capacity enhancement and anti-channeling production increase plan, inject energy replenishing fluid or production increase medium.

[0133] According to the capacity enhancement and production improvement plan, on-site construction was carried out, and a total of 6818m³ of replenishing fluid was injected. 3 Of which, carbon dioxide was 818m 3 6000ml surfactant solution 3 .

[0134] Step 11: Perform fracturing on the fracturing well.

[0135] After the injection of replenishing fluid was completed in the old well #1, fracturing was carried out in the new well. Monitoring showed that during the fracturing of the new well, the old well #1 experienced a pressure increase of 5 MPa. This increase was significantly smaller than the pressure rise during fracturing interference in previous similar well groups. See Table 1 for details: Statistical Table of Pressure Fluctuations in Wells Affected by Fracturing Interference.

[0136] Table 1

[0137]

[0138]

[0139] Table 2

[0140]

[0141] Step 12: Resume production.

[0142] After the fracturing well was completed and the stagnation time of the potentially disturbed wells reached the design conditions, the well group was opened in coordination to resume production. The production of well #1 did not show the decline seen in previous potentially disturbed wells; instead, it showed a significant increase, with an initial increase of 3.8 tons, representing a 108.7% increase in production, achieving a good oil production boost. Specific statistical information is shown in Table 2, the statistical table of production fluctuations in wells affected by fracturing.

[0143] In this example, by adopting the method of preventing cross-contamination in shale oil wells, the following two technical effects are achieved for wells that are potentially affected by cross-contamination:

[0144] First, it prevents crosstalk, which is beneficial for protecting or increasing the production of wells that may be affected by crosstalk.

[0145] Secondly, the well that was disturbed was replenished with energy in advance. When the fracturing well is fracturing, the fracturing fluid is less likely to flow towards the potentially disturbed well. This results in more fractures spreading towards the old well after fracturing, ensuring that the fracturing fluid in the fracturing well can fully play its fracturing role, promoting a more uniform distribution of fractures in the fracturing well, and improving the fracturing effect of the fracturing well.

[0146] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Claims

1. A method for preventing cross-contamination and increasing production in shale oil wells, characterized in that, The method includes: The energy storage level at the current stage is determined based on the fracturing fluid volume and current production volume of the disturbed well. Determine the anti-channeling and production enhancement plan based on the current energy storage level of the disturbed well; The determined anti-crossing and production enhancement plan is implemented on the disturbed well to prevent cross-crossing and increase production.

2. The method for preventing channeling and increasing production in shale oil wells according to claim 1, characterized in that, The current energy storage level of the disturbed well is: Among them, V F Q represents the amount of fracturing fluid in the disturbed well. P E represents the production rate of the disturbed well. S This represents the current energy storage level.

3. The method for preventing channeling and increasing production in shale oil wells according to claim 1, characterized in that, The step of determining the anti-channeling and production enhancement scheme based on the current energy storage level of the disturbed well includes: Based on the current energy storage level of the disturbed well, the first anti-channeling and production enhancement scheme is determined to be adopted. Based on the fracturing fluid volume and production volume of the disturbed well, determine the amount of replenishing fluid used in the first anti-channeling and production enhancement scheme; Based on the determined amount of replenishing fluid and the production-boosting media in the first anti-channeling production-increasing scheme, determine the amount of each production-boosting media.

4. The method for preventing channeling and increasing production in shale oil wells according to claim 3, characterized in that, The first anti-counterfeiting and production increase scheme includes: If the current energy storage level of the disturbed well is 80% ≤ E S <90%, use production-enhancing media to increase the energy storage level of the disturbed well to 90%; If the potential energy storage level of the disturbed well is E S <60%, using production-enhancing media to increase the energy storage level of the disturbed well to between 80% and 90%.

5. The method for preventing channeling and increasing production in shale oil wells according to claim 4, characterized in that, The amount of energy replenishing fluid used in the first anti-channeling and production-increasing scheme includes: If the current energy storage level of the disturbed well is 80% ≤ E S When <90%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is: Q I =(90%-E S )V F ; In the above formula, Q I To increase the total amount of production media used, E S V represents the current energy storage level of the disturbed well. F The amount of fracturing fluid in the disturbed well.

6. The method for preventing channeling and increasing production in shale oil wells according to claim 5, characterized in that, The amount of energy replenishing fluid used in the first anti-channeling and production-increasing scheme includes: If the potential energy storage level of the disturbed well is E S When <60%, the amount of replenishing fluid used in the first anti-channeling and production-increasing scheme is: Q I =(c-E S )V F In the above formula, the value of c ranges from 80% to 90%.

7. The method for preventing channeling and increasing production in shale oil wells according to claim 6, characterized in that, The step of determining the anti-channeling and production enhancement scheme based on the current energy storage level of the disturbed well includes: If the current energy storage level of the disturbed well is 80% ≤ E S <90%, therefore the second anti-crossing and production-increasing plan will be adopted; Based on the fracturing fluid volume and production volume of the disturbed well, the total amount of replenishing fluid and water replenishment in the second anti-channeling and production enhancement scheme are determined respectively.

8. The method for preventing channeling and increasing production in shale oil wells according to claim 7, characterized in that, The second anti-channeling and production-increasing scheme is as follows: The energy storage level of the disturbed well is increased to within the range of value b by using a production-enhancing medium; After the energy storage level of the disturbed well is increased to a predetermined range, the energy storage level of the disturbed well is increased to 90% by using the replenishment water.

9. The method for preventing channeling and increasing production in shale oil wells according to claim 7, characterized in that, The total amount of energy replenishing fluid used in the second anti-channeling and production-increasing scheme is: Q I =(b-Q S )V F The water replenishment amount in the second anti-crossing and production-increasing plan is: Q W =(90%-b)V F Wherein, the value of b ranges from 80% to 90%, and Q W This refers to the amount of water to be replenished.

10. A device for preventing cross-cutting and increasing production in shale oil wells, characterized in that, The device includes a memory and a processor; the memory is used to store a shale oil well anti-channeling and production enhancement program, and the processor is used to read and execute the shale oil well anti-channeling and production enhancement program, and execute the method according to any one of claims 1-9.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a data processing program, which is executed by a processor according to any one of claims 1-9, the method for preventing cross-cutting and increasing production in shale oil wells.

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