In-situ leaching fracturing effect control method and device, storage medium and electronic equipment

Abstract

The application discloses a method and device for controlling in-situ leaching fracturing effect, a storage medium and an electronic device. It relates to the technical field of in-situ leaching uranium mining. The method comprises the following steps: constructing an in-situ leaching fracture propagation model, which is used to represent the correlation between a fracture range parameter and a fracturing control parameter; obtaining a target fracture range of a mineral layer section of an in-situ leaching borehole and a target depth at which perforating and fracturing operations are performed in the in-situ leaching borehole; based on the target fracture range and the in-situ leaching fracture propagation model, designing a target parameter value of the fracturing control parameter; after the perforating tool is lowered to the target depth, performing a perforating operation; after the perforating operation is completed, lowering the fracturing tool to the target depth; based on the target parameter value of the fracturing control parameter, controlling the fracturing tool at the target depth to perform a fracturing operation. The application can accurately control the in-situ leaching fracturing range, thereby ensuring the integrity of the in-situ leaching well pattern.

Description

Technical Field

[0001] This application relates to the field of in-situ leaching uranium mining technology, and in particular to a method, apparatus, storage medium and electronic equipment for controlling the effect of in-situ leaching fracturing. Background Technology

[0002] In-situ leaching (ISL) involves injecting leaching solution into the ore-bearing formation through boreholes, where it reacts with uranium minerals to extract uranium resources. To improve formation permeability and expand the injection range, hydraulic fracturing can be considered for the reservoir; however, how to effectively control fracturing remains a major technical challenge in this field.

[0003] Currently, traditional oil fracturing technology aims for large fracture networks and large stimulation volumes, with fractures reaching hundreds of meters in diameter. However, in in-situ leaching uranium production, the well spacing is relatively narrow. If this technology is directly applied to in-situ leaching uranium production, it will lead to crosstalk between leaching wells, disrupting the uniformity and integrity of the leaching area. Summary of the Invention

[0004] In view of this, this application provides a method, device, storage medium and electronic equipment for controlling the effect of in-situ fracturing, which mainly enables precise control of the in-situ fracturing range, thereby ensuring the integrity of the in-situ well network.

[0005] According to a first aspect of this application, a method for controlling the effect of in-situ fracturing is provided, the method comprising: A ground-immersion fracture propagation model is constructed, which is used to represent the correlation between fracture extent parameters and fracturing control parameters; To obtain the target fracture range of the ore-bearing borehole and the target depth for perforation and fracturing operations in the ore-bearing borehole; Based on the target fracture range and the ground immersion fracture propagation model, the target parameter values ​​of the fracturing control parameters are designed. After the perforation tool is lowered to the target depth, the perforation operation is performed. After the perforation operation is completed, the fracturing tool is lowered to the target depth. Based on the target parameter value of the fracturing control parameters, the fracturing tool located at the target depth is controlled to perform fracturing operations.

[0006] According to a second aspect of this application, a device for controlling the effect of in-situ fracturing is provided, the device comprising: A construction unit is used to construct a ground-immersion fracture propagation model, which is used to represent the correlation between fracture range parameters and fracturing control parameters; The acquisition unit is used to acquire the target fracture range of the ore layer in the leaching borehole, as well as the target depth for perforation and fracturing operations in the leaching borehole. The design unit is used to design the target parameter values ​​of the fracturing control parameters based on the target fracture range and the ground immersion fracture propagation model. The positioning unit is used to control the perforation tool to be lowered to the target depth to perform the perforation operation, and to control the fracturing tool to be lowered to the target depth after the perforation operation is completed. The control unit is used to control the fracturing tool located at the target depth to perform fracturing operations based on the target parameter value of the fracturing control parameters.

[0007] According to a third aspect of this application, a storage medium is provided that stores a computer program thereon, which, when executed by a processor, implements the above-described method for controlling the effects of in-situ fracturing.

[0008] According to a fourth aspect of this application, an electronic device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described method for controlling the fracturing effect of in-situ immersion.

[0009] By employing the above technical solutions, this application provides a method, apparatus, storage medium, and electronic device for controlling the effect of in-situ fracturing. By constructing an in-situ fracturing fracture propagation model, the correlation between fracture range parameters and fracturing control parameters is determined. Based on the correlation represented by the in-situ fracturing fracture propagation model and the target fracture range, target parameter values ​​for fracturing control parameters can be designed. Thus, based on these target parameter values, the fracturing range can be precisely controlled during fracturing operations, ensuring the integrity of the in-situ leaching well network and improving leaching efficiency.

[0010] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic flowchart of a method for controlling the effect of in-situ fracturing provided in an embodiment of this application is shown; Figure 2 This paper illustrates a flowchart of a method for real-time calculation of the downslope depth provided in an embodiment of this application. Figure 3 A schematic diagram of a ground immersion fracturing effect control device provided in an embodiment of this application is shown. Detailed Implementation

[0012] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0013] In the field of in-situ leaching uranium mining, the well spacing is relatively narrow. If the oil fracturing process is directly applied to the field of in-situ leaching uranium mining, it will lead to crosstalk between in-situ leaching wells and destroy the uniformity and integrity of the leaching area.

[0014] To address the aforementioned problems, embodiments of the present invention provide a method for controlling the effect of in-situ fracturing, such as... Figure 1 As shown, the method includes: Step 10: Construct a ground immersion fracture propagation model, which is used to represent the relationship between fracture range parameters and fracturing control parameters.

[0015] The fracture range parameters include fracture length, fracture height, and fracture width parameters, and the fracturing control parameters include injection rate, injection time, and fracturing fluid viscosity parameters.

[0016] To clarify the technical concept of this invention, the perforation and fracturing operation processes are first described. First, according to the geological drilling design, the perforation tool is lowered to the target depth of the leaching borehole. Then, the fracturing skid and sand-mixing skid are activated to form a high-pressure, sand-laden jet, perforating the wellbore. After perforation, a flushing and sand-removal operation is performed to ensure unobstructed flow in the perforated section. Next, the fracturing tool is replaced and lowered further to the target depth. Based on the target parameter values ​​of the designed fracturing control parameters, the fracturing skid and sand-mixing skid are activated, controlling the fracturing tool to output high-pressure fluid for reservoir fracturing, thus completing the fracturing operation. Compared to existing uranium leaching processes that only use perforation, this invention adds fracturing to the perforation process, thereby improving ore layer permeability, expanding the injection range, and increasing leaching efficiency.

[0017] Two technical challenges arise during the perforation and fracturing operations described in this embodiment of the invention. The first challenge is the need for precise control of the fracturing range to prevent cross-contamination between leaching wells and disruption of the uniformity and integrity of the leaching area. To overcome this challenge, this embodiment proposes an innovation: constructing a leaching fracture propagation model. Based on this model, target parameter values ​​for fracturing control are designed, and the fracturing range is precisely controlled during fracturing operations based on these target parameter values. The second challenge is ensuring that subsequent fracturing operations are completed at the same location downhole after perforation to avoid failing to improve formation permeability and expand the injection range. To overcome this challenge, this embodiment proposes a second innovation: calculating the lowering positions of the perforation and fracturing tools in real-time during their deployment. Operations begin only after both tools reach the target depth, ensuring that perforation and fracturing operations are completed at the same location downhole.

[0018] To achieve the perforation and fracturing operations described in the embodiments of the present invention, the present invention also provides a perforation and fracturing device specifically for in-situ immersion. The device consists of two core skid-mounted modules, namely a sand mixing skid and a fracturing skid. In addition, the device also includes a lowering and positioning system, a fracturing range control system, a monitoring and evaluation system, and an overpressure protection system.

[0019] The sand mixing skid integrates a sand conveying system, a mixing system, a liquid supply system, and a weighing monitoring system. The sand conveying system includes a sand hopper and a variable frequency speed-regulating auger. The sand hopper has a built-in bag breaker and anti-clogging structure, and the auger speed is infinitely adjustable to achieve precise sand delivery. The mixing system includes a mixing tank and an agitator. The tank is equipped with baffles, and the agitator is driven by a variable frequency motor to ensure uniform mixing of the sand and liquid. The liquid supply system includes a tank, a suction pump, and a discharge pump, all controlled by variable frequency, with a maximum discharge capacity of no less than 3m³. 3 The flow rate is [value] / min to meet the shallow fracturing flow requirements. A high-precision dynamic weighing module is installed between the sand bucket and the auger to monitor the rate of change of sand volume during perforation and the rate of change of proppant mass during fracturing. Combined with auger rotation speed feedback, closed-loop control of the sand ratio and proppant mass ratio is implemented to ensure precise control of the water-sand ratio during perforation and the proppant mass ratio during fracturing, and the data is recorded and uploaded in real time. This embodiment of the invention upgrades traditional stock monitoring and on / off control to flow monitoring and continuous closed-loop control through the weighing monitoring system, thereby achieving a control accuracy of ±1% of the set value for the sand ratio and proppant mass ratio.

[0020] The fracturing skid adopts a container-type skid-mounted structure, and its overall dimensions are required to allow for loading and unloading across different areas (existing equipment dimensions reference). To facilitate transportation and cross-regional operations, the fracturing skid integrates the engine, gearbox, and fracturing pump assembly. Specifically, the engine requires a power output of ≥900kW (diesel power), and the gearbox's maximum power input must be greater than 1.1 times the engine's required power, with output power meeting the requirements for shallow, low-pressure fracturing (initiation pressure 10-25MPa). The fracturing pump assembly has a maximum operating pressure ≥40MPa and a maximum displacement >1.5 m³ / s. 3 / min, 1800 type power end and 4-inch hydraulic end, maximum working pressure 50MPa, maximum displacement 2 m 3 / min, adjustable output, suitable for small displacement and precise fracturing operations.

[0021] The descent positioning system integrates a depth encoder, wellhead pressure sensor, coupling locator, and downhole temperature sensor. It provides real-time positioning and calculates the descent depth of the perforating and fracturing tools during descent, with an overall positioning error of less than 0.1m. Specifically, the depth encoder is installed at the shaft end of the tubing or cable injection head roller, with a resolution ≥1024 pulses / revolution; the wellhead pressure sensor monitors annular pressure; the downhole temperature sensor measures downhole temperature; the coupling locator is installed at one end of each tubing string, and the receiver is installed at the joint between the perforating and fracturing tools and the tubing string. The descent depth is corrected every time the perforating or fracturing tool passes through a tubing string during descent. The collected multi-channel sensor signals are sent to the control box in real time, where the PLC calculates the descent depth and displays it on an industrial touchscreen.

[0022] The fracturing range control system incorporates a ground-immersion fracture propagation model and employs a closed-loop control strategy to ensure that the fracture range meets the target requirements.

[0023] The overpressure protection system can achieve dual protection of electronic automatic overpressure protection and mechanical safety valve. In case of overpressure, it will automatically return to idle speed and disengage gear to ensure the safety of shallow formations.

[0024] The monitoring and evaluation system includes a downhole microseismic monitoring module, a tracer monitoring module, and an analysis module. For the downhole microseismic monitoring module, a 33-component high-sensitivity geophone array is deployed in adjacent wells or monitoring wells to collect microseismic events in real time, inverting the direction, length, and extent of fracture propagation to determine if it exceeds the target design range. For the tracer monitoring module, environmentally friendly tracers (such as sodium fluorescein or ammonium salts) are added to the fracturing fluid. Through wellhead sampling and portable analysis equipment, the appearance time and concentration of the tracer in surrounding monitoring wells are monitored to determine fracture connectivity and affected area, ensuring no cross-contamination with neighboring wells. For the analysis module, high-frequency pressure sensors and electromagnetic flowmeters are installed at key nodes such as the fracturing pump outlet, wellhead, and mixing tank to record parameters such as pressure, flow rate, and proppant mass ratio in real time for fracturing operation curve analysis and fracture initiation pressure identification.

[0025] It should be noted that the specific value ranges of the performance parameters listed above in the embodiments of the present invention do not constitute a limitation, but are only a preferred method.

[0026] The first innovation of this invention is that, in order to achieve precise control of the fracturing range during fracturing operations and prevent cross-contamination between in-situ immersion wells, it is necessary to pre-construct an in-situ immersion fracture propagation model to determine the correlation between fracture range parameters and fracturing control parameters. The fracture range parameters include fracture length, fracture height, and fracture width parameters, while the fracturing control parameters include injection rate, injection time, and fracturing fluid viscosity. Using the in-situ immersion fracture propagation model, fracturing control parameter values ​​that conform to the target fracture range can be designed. During actual fracturing operations, based on the designed fracturing control parameter values, it can be ensured that the fracturing range is controllable and cross-contamination between wells is prevented.

[0027] When constructing the in-situ leaching fracture propagation model, based on the Poisson's ratio and shear modulus of the rock in the ore-bearing section, as well as the injection displacement parameter, the fracturing fluid viscosity parameter, the fracture length parameter, and the fracture shape coefficient, an expression for the fracture width parameter is constructed; based on the injection displacement parameter, the injection time parameter, the fracture height parameter, the fracture width parameter, and the fracturing efficiency coefficient, an expression for the fracture length parameter is constructed; ore-bearing layer thickness constraints and well spacing constraints are constructed; based on the expressions for the fracture width parameter and the fracture length parameter, as well as the ore-bearing layer thickness constraints and the well spacing constraints, the in-situ leaching fracture propagation model is constructed.

[0028] Specifically, the expression for the constructed crack width parameter is as follows:

[0029] in, This represents the crack width parameter, in millimeters (mm). Represents the Poisson's ratio of rocks; This represents the injection displacement parameter, in cubic meters per minute (m³ / min). This represents the viscosity parameter of the fracturing fluid, in millipascals (mPa). seconds (mPa s); This represents the crack length parameter, specifically the crack half-length parameter, in meters (m). Represents the rock shear modulus, with the unit being megapascals (MPa). Represents the shape factor.

[0030] The expression for the crack length parameter is as follows:

[0031] in, t This represents the injection time parameter, in minutes (min). This represents the crack height parameter, in meters (m). The efficiency coefficient is dimensionless and ranges from 0.6 to 0.9.

[0032] By substituting the expression for the fracture width parameter into the expression for the fracture length parameter, the relationship between the fracture length parameter, fracture height parameter, injection displacement parameter, injection time parameter, and fracturing fluid viscosity parameter can be obtained. This relationship shows that the fracture length parameter and fracture height parameter change with the injection displacement parameter, injection time parameter, and fracturing fluid viscosity parameter. Therefore, if a target fracturing range is given, i.e., the expected values ​​of the fracture length parameter and fracture height parameter are known, the range of values ​​for the injection displacement parameter, injection time parameter, and fracturing fluid viscosity parameter can be derived, thereby controlling the fracturing operation.

[0033] In addition to constructing the above relational expression, it is also necessary to construct ore layer thickness constraints and well spacing constraints. The specific ore layer thickness constraints are as follows:

[0034] The safety margin can be set according to actual business needs. Considering the uncontrollability of fracturing operations, the safety margin should not be set too small. The well spacing refers to the distance between the well to be operated and its adjacent wells, which is measured at the operation site.

[0035] The specific well spacing constraints are as follows.

[0036] The thickness of the mineral layer is typically 3-15 meters.

[0037] Based on the aforementioned relational expressions, ore layer thickness constraints, and well spacing constraints, the in-situ leaching fracture propagation model can be determined.

[0038] Step 20: Obtain the target fracture range of the ore layer in the leaching borehole, and the target depth for perforation and fracturing operations in the leaching borehole.

[0039] The target fracture range includes the expected values ​​for fracture length, fracture height, and fracture width parameters. The target depth is the depth at which perforation and fracturing operations are performed downhole, and can be set according to actual operational needs.

[0040] For example, given an expected value of 2.5-5 meters for the fracture length parameter and an expected value of 1 meter for the fracture height parameter, the target depth for perforation and fracturing operations in the underground mining section is determined to be 625 meters.

[0041] Step 30: Based on the target fracture range and the ground immersion fracture propagation model, design the target parameter values ​​for the fracturing control parameters.

[0042] The target crack range includes the expected values ​​of crack length, crack height, and crack width parameters. It should be noted that since the crack width parameter is simplified in the ground immersion crack propagation model, it is not necessary to give the expected value of the crack width parameter.

[0043] In this embodiment of the invention, the fracturing operation mainly includes three stages: the initial stage, the propagation stage, and the termination stage. The initial stage involves filling the tubing with fluid to create injection pressure. The propagation stage is the fracture formation process; as fluid fills the tubing, when the fracturing pump pressure reaches a certain value, fractures gradually form along the perforation direction. The termination stage occurs when the fracture reaches the target range, requiring rapid cessation of injection to reduce the fracturing pump pressure. Since fractures primarily form during the propagation stage, a ground-immersed fracture propagation model can be used to design target parameter values ​​for fracturing control parameters during the propagation stage. Then, based on the target parameter values ​​for the propagation stage, the target parameter values ​​for fracturing control parameters in the initial and termination stages can be derived.

[0044] Based on this, step 30 specifically includes: designing the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage based on the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, and the ground immersion fracture propagation model; designing the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the initial and final stages based on the target parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage; and determining the target parameter value based on the parameter values ​​of the propagation stage, the initial stage, and the final stage.

[0045] In this embodiment of the invention, the expected values ​​corresponding to the fracture length and fracture height parameters are substituted into the in-situ leaching fracture propagation model. Under the constraints of ore layer thickness and well spacing, the parameter ranges for injection rate, injection time, and fracturing fluid viscosity during the propagation stage are calculated. For example, to meet the target fracturing range, in the propagation stage, the injection rate range is set to A, the fracturing fluid viscosity range to B, and the injection time range to C. The proppant mass ratio in the propagation stage can be set according to actual operational needs. After determining the injection rate, fracturing fluid viscosity, injection time, and proppant mass ratio in the propagation stage, the injection rate, fracturing fluid viscosity, injection time, and proppant mass ratio in the initial and final stages are calculated. Specifically, the injection flow rate in the initial and final stages should be lower than that in the propagation stage. For example, if the injection flow rate range A in the propagation stage is (a1, a2), the injection flow rate in the initial stage should be lower than a1. This can be set based on practical experience, such as setting the injection flow rate range for the initial stage to (a1-0.3, a1). The final stage requires a rapid cessation of injection, so its injection flow rate is even lower; therefore, the injection flow rate for the final stage can be set to (a1-0.5, a1-0.3). Regarding injection time, the propagation stage is the time for fracture formation, therefore, the injection time in the propagation stage is the longest. After determining the injection flow rate in the initial stage, the injection time in the initial stage can be estimated based on the injection flow rate in the initial stage and the pressure of the fracturing pump when the fracture is generated (actual measured empirical values). The injection time in the final stage will be set shorter than that in the initial stage. Regarding fracturing fluid viscosity, since the viscosity gradually increases during the initial, propagation, and termination stages, the viscosity during the initial and termination stages can be calculated after determining the viscosity during the propagation stage. Regarding the proppant mass ratio, the proppant mass ratio during the propagation stage can be set based on practical experience. The fracturing fluid viscosity also gradually increases during the initial, propagation, and termination stages; therefore, the proppant mass ratio during the initial and termination stages can be calculated after determining the proppant mass ratio during the propagation stage.

[0046] Therefore, by using the above method, the ground immersion fracture propagation model can be used to design the parameter values ​​of the fracturing control parameters in the initial, propagation, and termination stages, thereby meeting the fracturing range requirements.

[0047] Step 40: After controlling the perforation tool to be lowered to the target depth, perform the perforation operation. After the perforation operation is completed, control the fracturing tool to be lowered to the target depth.

[0048] In this embodiment of the invention, during perforation operations, the sandblasting perforation tool needs to be lowered to the target depth. To ensure accurate lowering of the perforation tool to the target depth, the lowering depth needs to be calculated in real time. The calculation process for this lowering depth is as follows: Figure 2As shown, it includes: Step 41: Collect the wellhead pressure, downhole temperature, and surface calibration temperature of the immersion borehole, as well as the displacement increment of the encoder and the depth correction value of the coupling positioner in each sampling cycle.

[0049] In this embodiment of the invention, the depth encoder and wellhead pressure sensor are located on the surface, while the coupling locator and temperature sensor are located downhole. Specifically, the depth encoder can be used to collect the displacement increment of the perforating tool in each cycle, the wellhead pressure sensor can be used to collect the wellhead pressure, the downhole temperature sensor can be used to collect the downhole temperature, the surface temperature can be measured using the surface temperature sensor, and the coupling locator can be used to collect the depth deviation (depth correction value) of the perforating tool during the lowering process.

[0050] Step 42: Calculate the lowering depth of the perforating tool in real time based on the wellhead pressure, downhole temperature, surface calibration temperature, displacement increment of each sampling cycle, and depth correction value.

[0051] In this embodiment of the invention, when calculating the lowering depth in real time, the current base depth of the perforating tool is calculated based on the displacement increment of each sampling cycle; the tubing tension compensation depth is calculated based on the wellhead pressure; the temperature compensation depth is calculated based on the downhole temperature and the surface calibration temperature; and the lowering depth of the perforating tool is calculated in real time based on the base depth, the tubing tension compensation depth, the temperature compensation depth, and the depth correction value.

[0052] In calculating the base depth, the initial calibration depth, depth correction coefficient, and the number of sampling cycles of the encoder are obtained. Based on the number of sampling cycles, the displacement increment of each sampling cycle is accumulated to obtain the total displacement increment. Based on the depth correction coefficient, the total displacement increment is corrected to obtain the corrected total displacement increment. Based on the initial calibration depth and the corrected total displacement increment, the current base depth of the perforating tool is calculated. The specific calculation formula for the base depth is as follows:

[0053] in, Represents the basic depth, in meters (m). This represents the initial calibration depth, in meters (m). Represents the encoder's first i Displacement increment per sampling period, in meters (m). K This represents the depth correction factor, which is dimensionless and mainly considers the effects of tubing tension and temperature. n This represents the number of sampling periods.

[0054] In calculating the tubing string tension compensation depth, the annular cross-sectional area, tubing string elastic modulus, and tubing string cross-sectional area of ​​the immersion borehole are obtained. The wellhead pressure, annular cross-sectional area, and foundation depth are multiplied together to obtain the result. This result is then divided by the tubing string elastic modulus and tubing string cross-sectional area to obtain the tubing string tension compensation depth. The specific calculation formula for the tubing string tension compensation depth is as follows.

[0055] in, This represents the depth of tubular tension compensation. This represents the axial tensile force in the tubing, measured in Newtons (N). This represents the wellhead pressure, measured in Pascals (Pa). Represents the cross-sectional area of ​​the annulus; This represents the elastic modulus of the tubular column, with the unit being Pascal (Pa). This represents the cross-sectional area of ​​the tubular column, expressed in square meters (m²).

[0056] In calculating the temperature compensation depth, the tubing expansion coefficient is obtained; the downhole temperature is subtracted from the surface calibration temperature to obtain the temperature difference; the tubing expansion coefficient, the temperature difference, and the base depth are multiplied to obtain the temperature compensation depth. The specific formula for calculating the temperature compensation depth is as follows:

[0057] in, Represents the temperature compensation depth, in meters (m). Represents the coefficient of thermal expansion of the tubular column; This represents the downhole temperature, expressed in degrees Celsius (°C). This represents the ground temperature, expressed in degrees Celsius (°C).

[0058] Ultimately based on the base depth , tubing tension compensation depth and temperature compensation depth Real-time calculation of the depth of the perforation tool The specific formula is as follows:

[0059] in, This represents the known sleeve coupling depth correction value detected by the coupling locator, in meters (m), and serves as a periodic correction point.

[0060] Step 43: When the perforation tool reaches the target depth, stop lowering and control the perforation tool to perform perforation operation.

[0061] During positioning, first lower the perforating tool to the wellhead flange, press the zeroing button on the control box, and set... The value is equal to 0. The perforating tool is then lowered to the first pipe coupling position. After the receiver detects the coupling signal, the control box automatically reads the known depth of the coupling, corrects the accumulated error, and displays the positioning depth, lowering speed, and suspension weight in real time. An alarm is triggered when the positioning deviation exceeds 0.2m. Once the positioning depth reaches the target depth, if the depth error detected by the coupling locator in the previous 3-5 sampling cycles is less than the preset error, the position is locked, lowering is stopped, and perforation operation begins.

[0062] Step 50: Based on the target parameter value of the fracturing control parameters, control the fracturing tool located at the target depth to perform fracturing operations.

[0063] In this embodiment of the invention, after the perforation operation is completed, the perforation operation is replaced by fracturing tools. The fracturing tools are lowered to the target depth. During the lowering process, the positioning method of step 40 is used to locate the lowering depth of the fracturing tools in real time. When the lowering depth of the fracturing tools reaches the target depth, the proppant mass is weighed in real time and the screw conveyor speed is adjusted according to the target parameter value of the fracturing control parameters determined in step 30. At the same time, the fracturing skid is controlled to output high-pressure liquid for reservoir fracturing.

[0064] During fracturing operations, the pressure of the fracturing pump can be monitored in real time, allowing for dynamic adjustments to the injection rate, injection time, and fracturing fluid viscosity. Specifically, the fracture propagation state can be determined based on the real-time pressure derivative dp / dt. If the pressure derivative dp / dt is stable, fracturing control is performed according to the target parameter values ​​of the designed fracturing control parameters. If the pressure derivative decreases, it indicates accelerated fracture propagation (potentially exceeding limits), and the injection rate can be reduced. If the pressure derivative increases, it indicates fracture obstruction or proppant blockage, and the proppant mass ratio can be reduced.

[0065] This invention provides a method for controlling the effect of in-situ leaching fracturing. By constructing an in-situ leaching fracture propagation model, the correlation between fracture range parameters and fracturing control parameters is determined. Based on the correlation represented by the in-situ leaching fracture propagation model and the target fracture range, target parameter values ​​for fracturing control parameters can be designed. This allows for precise control of the fracturing range during fracturing operations based on these target parameter values, ensuring the integrity of the in-situ leaching well network and improving leaching efficiency. Simultaneously, this invention can accurately locate the lowering depth of perforating and fracturing tools, ensuring that perforating and fracturing operations are performed in the same location.

[0066] Furthermore, as Figure 1 and Figure 2The specific implementation of the method shown in this embodiment provides a device for controlling the effect of in-situ fracturing, such as... Figure 3 As shown, the device includes: a construction unit 101, an acquisition unit 102, a design unit 103, a positioning unit 104, and a control unit 105.

[0067] The construction unit 101 can be used to construct a ground immersion fracture propagation model, which is used to represent the correlation between fracture range parameters and fracturing control parameters.

[0068] The acquisition unit 102 can be used to acquire the target fracture range of the ore layer in the leaching borehole, as well as the target depth for perforation and fracturing operations in the leaching borehole.

[0069] The design unit 103 can be used to design target parameter values ​​for the fracturing control parameters based on the target fracture range and the ground immersion fracture propagation model.

[0070] The positioning unit 104 can be used to control the perforation tool to be lowered to the target depth to perform the perforation operation, and to control the fracturing tool to be lowered to the target depth after the perforation operation is completed.

[0071] The control unit 105 can be used to control the fracturing tool located at the target depth to perform fracturing operations based on the target parameter value of the fracturing control parameters.

[0072] In some embodiments, the fracture range parameters include fracture length parameters, fracture height parameters, and fracture width parameters; the fracturing control parameters include injection displacement parameters, injection time parameters, and fracturing fluid viscosity parameters; and the construction unit 101 includes: a first construction module, a second construction module, and a third construction module.

[0073] The first construction module is used to construct an expression for the fracture width parameter based on the Poisson's ratio and shear modulus of the rock in the ore layer, as well as the injection displacement parameter, the fracturing fluid viscosity parameter, the fracture length parameter, and the fracture shape coefficient.

[0074] The first construction module is further configured to construct an expression for the fracture length parameter based on the injection displacement parameter, the injection time parameter, the fracture height parameter, the fracture width parameter, and the fracturing efficiency coefficient.

[0075] The second construction module can be used to construct ore layer thickness constraints and well spacing constraints.

[0076] The third construction module can be used to construct the ground leaching fracture propagation model based on the expressions for the fracture width parameter and the fracture length parameter, as well as the ore layer thickness constraint and the well spacing constraint.

[0077] In some embodiments, the target fracture range includes the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, respectively. The design unit 103 can be specifically used to design the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage based on the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, and the ground immersion fracture propagation model; to design the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the initial and final stages based on the target parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage, respectively; and to determine the target parameter value based on the parameter values ​​of the propagation stage, the parameter values ​​of the initial stage, and the parameter values ​​of the final stage.

[0078] In some embodiments, the positioning unit 104 includes: a data acquisition module, a calculation module, and a control module.

[0079] The acquisition module can be used to acquire the wellhead pressure, downhole temperature, and surface calibration temperature of the immersion borehole, as well as the displacement increment of the encoder and the depth correction value of the coupling positioner in each sampling cycle.

[0080] The calculation module can be used to calculate the lowering depth of the perforating tool in real time based on the wellhead pressure, the downhole temperature, the surface calibration temperature, the displacement increment of each sampling cycle, and the depth correction value.

[0081] The control module can be used to stop lowering the perforating tool when the lowering depth reaches the target depth, and control the perforating tool to perform perforation operations.

[0082] In some embodiments, the computing module includes: a first computing submodule, a second computing submodule, a third computing submodule, and a fourth computing submodule.

[0083] The first calculation submodule can be used to calculate the current base depth of the perforation tool based on the displacement increment of each sampling period.

[0084] The second calculation submodule can be used to calculate the tubing tension compensation depth based on the wellhead pressure.

[0085] The third calculation submodule can be used to calculate the temperature compensation depth based on the downhole temperature and the surface calibration temperature.

[0086] The fourth calculation submodule can be used to calculate the lowering depth of the perforating tool in real time based on the base depth, the string tension compensation depth, the temperature compensation depth, and the depth correction value.

[0087] In some embodiments, the first calculation submodule may be specifically used to obtain the initial calibration depth, the depth correction coefficient, and the number of sampling cycles of the encoder; based on the number of sampling cycles, to accumulate the displacement increment of each sampling cycle to obtain the total displacement increment; based on the depth correction coefficient, to correct the total displacement increment to obtain the corrected total displacement increment; and based on the initial calibration depth and the corrected total displacement increment, to calculate the current base depth of the perforation tool.

[0088] In some embodiments, the second calculation submodule may be specifically used to obtain the annular cross-sectional area, tubing elastic modulus, and tubing cross-sectional area of ​​the immersion borehole; multiply the wellhead pressure, the annular cross-sectional area, and the foundation depth to obtain the multiplication result; and divide the multiplication result by the tubing elastic modulus and the tubing cross-sectional area respectively to obtain the tubing tension compensation depth.

[0089] In some embodiments, the third calculation submodule may be specifically used to obtain the tubing expansion coefficient; subtract the downhole temperature from the surface calibration temperature to obtain the temperature difference; and multiply the tubing expansion coefficient, the temperature difference, and the base depth to obtain the temperature compensation depth.

[0090] It should be noted that other corresponding descriptions of the functional units involved in the in-situ fracturing effect control device provided in this embodiment can be found in [reference]. Figure 1 and Figure 2 The corresponding descriptions in [the document] will not be repeated here.

[0091] Based on the above, Figure 1 and Figure 2 Accordingly, this embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the above-described method. Figure 1 and Figure 2 The method for controlling the effect of in-situ fracturing is shown.

[0092] Based on this understanding, the technical solution of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause an electronic device (such as personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of this application.

[0093] Based on the above, Figure 1 and Figure 2 The method shown, and Figure 3 To achieve the above objectives, the present application also provides an electronic device, specifically a personal computer, tablet computer, server, or other network device, as shown in the virtual device embodiment. This device includes a storage medium and a processor; the storage medium stores a computer program; the processor executes the computer program to achieve the above-described objectives. Figure 1 and Figure 2 The method for controlling the effect of in-situ fracturing is shown.

[0094] Optionally, the aforementioned physical devices may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, input units such as a keyboard, etc., and optional user interfaces may also include USB interfaces, card reader interfaces, etc. The network interface may optionally include standard wired interfaces, wireless interfaces (such as Wi-Fi interfaces), etc.

[0095] Those skilled in the art will understand that the physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0096] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platform, or it can be implemented by hardware.

[0098] This invention, through the construction of a ground-leaching fracture propagation model, determines the correlation between fracture extent parameters and fracturing control parameters. Based on the correlation represented by the ground-leaching fracture propagation model and the target fracture extent, target parameter values ​​for fracturing control parameters can be designed. This allows for precise control of the fracturing range during fracturing operations based on these target parameter values, ensuring the integrity of the ground-leaching well network and improving leaching efficiency. Simultaneously, this invention can accurately determine the lowering depth of perforating and fracturing tools, ensuring that perforating and fracturing operations are performed in the same location.

[0099] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0100] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A method for controlling the effect of in-situ fracturing, characterized in that, include: A ground-immersion fracture propagation model is constructed, which is used to represent the correlation between fracture extent parameters and fracturing control parameters; To obtain the target fracture range of the ore layer in the leaching borehole, and the target depth for perforation and fracturing operations in the leaching borehole; Based on the target fracture range and the ground immersion fracture propagation model, the target parameter values ​​of the fracturing control parameters are designed. After the perforation tool is lowered to the target depth, the perforation operation is performed. After the perforation operation is completed, the fracturing tool is lowered to the target depth. Based on the target parameter value of the fracturing control parameters, the fracturing tool located at the target depth is controlled to perform fracturing operations; The fracture extent parameters include fracture length, fracture height, and fracture width parameters; the fracturing control parameters include injection rate, injection time, and fracturing fluid viscosity parameters; and the construction of the in-situ immersion fracture propagation model includes: Based on the Poisson's ratio and shear modulus of the rock in the ore layer, as well as the injection displacement parameter, the fracturing fluid viscosity parameter, the fracture length parameter, and the fracture shape coefficient, an expression for the fracture width parameter is constructed. Based on the injection displacement parameter, the injection time parameter, the fracture height parameter, the fracture width parameter, and the fracturing efficiency coefficient, an expression for the fracture length parameter is constructed. Construct constraints on ore layer thickness and well spacing; Based on the expressions for the fracture width parameter and the fracture length parameter, as well as the constraints for the ore layer thickness and the well spacing, the ground leaching fracture propagation model is constructed. The target fracture range includes the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, respectively. The step of designing the target parameter values ​​for the fracturing control parameters based on the target fracture range and the in-situ immersion fracture propagation model includes: Based on the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, and the ground immersion fracture propagation model, the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter are designed during the propagation stage. Based on the target parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage, the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the initial and final stages are designed respectively. The target parameter value is determined based on the parameter values ​​of the expansion phase, the initial phase, and the termination phase.

2. The method according to claim 1, characterized in that, After the controlled perforation tool is lowered to the target depth, the perforation operation is performed, including: The wellhead pressure, downhole temperature, and surface calibration temperature of the immersion borehole are collected, along with the displacement increment of the encoder and the depth correction value of the coupling positioner in each sampling cycle. The lowering depth of the perforating tool is calculated in real time based on the wellhead pressure, the downhole temperature, the surface calibration temperature, the displacement increment of each sampling cycle, and the depth correction value. When the perforating tool reaches the target depth, the descent is stopped, and the perforating tool is controlled to perform the perforation operation.

3. The method according to claim 2, characterized in that, The real-time calculation of the perforation tool's lowering depth based on the wellhead pressure, downhole temperature, surface calibration temperature, displacement increment for each sampling cycle, and depth correction value includes: Based on the displacement increment of each sampling period, the current base depth of the perforation tool is calculated; Calculate the tubing tension compensation depth based on the wellhead pressure. Calculate the temperature compensation depth based on the downhole temperature and the surface calibration temperature; The lowering depth of the perforating tool is calculated in real time based on the base depth, the string tension compensation depth, the temperature compensation depth, and the depth correction value.

4. The method according to claim 3, characterized in that, The calculation of the current base depth of the perforation tool based on the displacement increment of each sampling period includes: Obtain the initial calibration depth, depth correction coefficient, and number of sampling cycles of the encoder; Based on the number of sampling periods, the displacement increment of each sampling period is accumulated to obtain the total displacement increment; Based on the depth correction coefficient, the total displacement increment is corrected to obtain the corrected total displacement increment; Based on the initial calibration depth and the corrected total displacement increment, calculate the current base depth of the perforating tool; and / or The calculation of the tubing tension compensation depth based on the wellhead pressure includes: Obtain the annular cross-sectional area, tubing elastic modulus, and tubing cross-sectional area of ​​the immersion borehole; Multiply the wellhead pressure, the annular cross-sectional area, and the foundation depth to obtain the multiplication result; The multiplication result is divided by the elastic modulus of the tubing and the cross-sectional area of ​​the tubing, respectively, to obtain the tensile compensation depth of the tubing.

5. The method according to claim 3, characterized in that, The calculation of the temperature compensation depth based on the downhole temperature and the surface calibration temperature includes: Obtain the expansion coefficient of the tubing; The temperature difference is obtained by subtracting the downhole temperature from the surface calibration temperature. The temperature compensation depth is obtained by multiplying the expansion coefficient of the tubing, the temperature difference, and the foundation depth.

6. A device for controlling the effect of in-situ fracturing, characterized in that, include: A construction unit is used to construct a ground immersion fracture propagation model, which is used to represent the relationship between fracture range parameters and fracturing control parameters. The fracture range parameters include fracture length parameters, fracture height parameters, and fracture width parameters. The acquisition unit is used to acquire the target fracture range of the ore layer in the leaching borehole, and the target depth for perforation and fracturing operations in the leaching borehole, wherein the target fracture range includes the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, respectively. The design unit is used to design the target parameter values ​​of the fracturing control parameters based on the target fracture range and the ground immersion fracture propagation model. The positioning unit is used to control the perforation tool to be lowered to the target depth to perform the perforation operation, and to control the fracturing tool to be lowered to the target depth after the perforation operation is completed. The control unit is used to control the fracturing tool located at the target depth to perform fracturing operations based on the target parameter value of the fracturing control parameters; The construction unit is specifically used to construct an expression for the fracture width parameter based on the Poisson's ratio and shear modulus of the rock in the ore layer, as well as the injection displacement parameter, fracturing fluid viscosity parameter, fracture length parameter, and fracture shape coefficient; to construct an expression for the fracture length parameter based on the injection displacement parameter, injection time parameter, fracture height parameter, fracture width parameter, and fracturing efficiency coefficient; to construct ore layer thickness constraints and well spacing constraints; and to construct the in-situ leaching fracture propagation model based on the expressions for the fracture width parameter and the fracture length parameter, as well as the ore layer thickness constraints and the well spacing constraints. The design unit is specifically used to design the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage based on the expected values ​​corresponding to the fracture length parameter, the fracture height parameter, and the fracture width parameter, and the ground immersion fracture propagation model; based on the target parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the propagation stage, it designs the parameter values ​​of the injection displacement parameter, the injection time parameter, and the fracturing fluid viscosity parameter during the initial and final stages, respectively; and based on the parameter values ​​of the propagation stage, the parameter values ​​of the initial stage, and the parameter values ​​of the final stage, it determines the target parameter value.

7. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 5.

8. An electronic device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 5.

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