Method, device and equipment for evaluating well cementation quality through multi-stage fracturing and medium

Abstract

The invention discloses a method, a device and equipment for evaluating well cementation quality through multistage fracturing and a medium. The method is characterized by comprising the following steps: acquiring at least one group of well cementation wellbores and simulated drilling samples for simulating multi-stage fracturing; hydrofracture simulation is conducted according to the well cementation shaft and the simulation well drilling sample, and well cementation quality change parameters are determined; and performing quantitative evaluation on the well cementation quality of the well cementation shaft according to the well cementation quality change parameters, and determining a target evaluation result. The hydraulic well fracturing construction process is completely simulated, the well cementation quality change degree under different fracturing working conditions can be visually and quantitatively obtained, the well cementation quality safety is improved, safe production in the hydraulic fracturing construction process is guaranteed, and construction risks are reduced.

Description

Technical Field

[0001] The invention relates to the field of hydraulic fracturing mining, and in particular to a method, device, equipment and medium for evaluating the quality of cementing by multi-stage fracturing. Background Art

[0002] Hydraulic fracturing well exploitation is an efficient exploitation method for oil and gas exploration and exploitation. It is achieved by drilling vertical wells and hydraulic wells in oil and gas reservoirs, drilling the wellbore along the hydraulic direction through directional drilling, cementing the production pipeline, and drilling holes through precise drilling methods. The oil and gas layers are hydraulically fractured by fracturing water for exploitation. At present, the long hydraulic well segmented multi-cluster fracturing technology mode has a long construction period, high pressure and complex alternating load conditions. The cement ring in the cementing annulus and its first and second interfaces have the risk of failure, which further leads to uneven expansion between pressure channeling and multi-cluster cracks, reducing the effect of fracturing transformation, and there are high risks in construction and later production. The technical means of logging and interpreting cementing quality in the existing technology are time-consuming, low in safety and serious waste of resources, making it difficult to carry out detection and evaluation during the fracturing process. Summary of the invention

[0003] The present invention provides a method, device, equipment and medium for evaluating cementing quality by multi-stage fracturing, so as to realize efficient and accurate early warning of well leakage in shale gas wells.

[0004] According to one aspect of the present invention, a method for evaluating cementing quality by multi-stage fracturing is provided, comprising:

[0005] obtaining at least one set of cemented wellbore and simulated drilling samples simulating multi-stage fracturing;

[0006] Performing hydraulic fracturing simulation based on the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters;

[0007] The cementing quality of the cementing wellbore is quantitatively evaluated according to the cementing quality change parameter to determine a target evaluation result.

[0008] According to another aspect of the present invention, there is provided a device for evaluating the effect of multi-stage fracturing on cementing quality, comprising:

[0009] A sample preparation module for obtaining at least one set of cemented wellbore and simulated drilling samples for simulating multi-stage fracturing;

[0010] A fracturing simulation module, used to perform hydraulic fracturing simulation based on the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters;

[0011] The quality assessment module is used to quantitatively assess the cementing quality of the cementing wellbore according to the cementing quality change parameter to determine a target assessment result.

[0012] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0013] at least one processor; and

[0014] a memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for evaluating cementing quality by multi-stage fracturing as described in any embodiment of the present invention.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for evaluating cementing quality by multi-stage fracturing as described in any embodiment of the present invention when executed.

[0017] The technical solution of the embodiment of the present invention can systematically, comprehensively and objectively simulate the multi-stage fracturing process through a variety of simulated drilling samples by acquiring at least one group of cementing wellbore and simulated drilling samples for simulating multi-stage fracturing, and can effectively improve the accuracy and credibility of the evaluation; hydraulic fracturing simulation is performed based on the cementing wellbore and the simulated drilling samples to determine cementing quality change parameters, and the change data of the cementing wellbore during the hydraulic fracturing process can be effectively observed through simulation, and the simulated structure of the cementing wellbore can be effectively analyzed, and the hydraulic fracturing simulation can effectively control variables to obtain more accurate fracturing data, thereby improving the accuracy of the evaluation; based on the cementing quality The cementing quality of the cementing wellbore is quantitatively evaluated by quantitative change parameters, and the target evaluation result is determined. The evaluation through cementing quality change parameters can effectively explain the changes of the cementing wellbore during the hydraulic fracturing construction process, and can make corresponding predictions based on the actual construction process, which solves the technical problem that it is difficult to predict and evaluate the cementing quality during the hydraulic fracturing process in the prior art, realizes a complete simulation of the hydraulic well fracturing construction process, and can intuitively and quantify the degree of cementing quality change under different fracturing conditions, thereby improving the cementing quality safety, ensuring the safe production of the hydraulic fracturing construction process, and reducing construction risks.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a flow chart of a method for evaluating cementing quality by multi-stage fracturing provided in Example 1 of the present invention;

[0021] Figure 2 For this embodiment, an example diagram of different cementing areas of cementing wellbore during actual construction process is disclosed;

[0022] Figure 3 is a flow chart of another method for evaluating cementing quality by multi-stage fracturing provided in the second embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a pre-set hole in a cementing wellbore disclosed in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of sandblasting at a hole through a micro hydraulic jet gun provided in an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of a device for evaluating cementing quality by multi-stage fracturing provided in the third embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of an electronic device for implementing the method for evaluating cementing quality by multi-stage fracturing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] Embodiment 1

[0029] Figure 1The first embodiment of the present invention provides a flowchart of a method for evaluating the quality of cementing by multi-stage fracturing. This embodiment can be applied to the prediction and evaluation of the cementing quality in the horizontal multi-stage fracturing process. The method can be performed by a device for evaluating the quality of cementing by multi-stage fracturing. The device can be implemented in the form of hardware and / or software. The device can be configured in an electronic device. Figure 1 As shown, the method includes:

[0030] S110, obtaining at least one set of cementing wellbore and simulated drilling samples for simulating multi-stage fracturing.

[0031] Among them, multi-stage fracturing can be a method of oil and gas extraction that uses hydraulic jets containing fracturing chemicals to perform segmented and multi-cluster fracturing on shale gas reservoirs; multi-stage fracturing can be used to increase the permeability of the reservoir and can effectively increase the output of oil and gas extraction.

[0032] Among them, cementing the wellbore can be done by injecting cement slurry to fill the gap between the casing and the wellbore wall to fix the wellbore in the well. Optionally, when simulating cementing the wellbore, different degrees of cementing are performed on the first cementing surface and the second cementing surface to prepare the wellbore, and multiple groups of different 100%, 75%, and 50% cementing areas are manually set to prepare the cementing wellbore. Among them, the simulation of the non-cemented area can be carried out by laying a 1mm thick foam board in the wellbore or wellbore wall with a height of 55cm. Exemplary, Figure 2 This embodiment discloses an example diagram of different cementing areas of the cementing wellbore during the actual construction process. Figure 2 As shown, there is a cement ring between the formation and the casing, the first bonding surface is completely covered by the cement ring, the second bonding surface is half covered by the cement ring, and the middle of the casing is the wellbore fluid. Based on this, the first bonding area of ​​the cemented wellbore can be 100%, and the second bonding area can be 75%.

[0033] The simulated drilling samples may be rock samples that are prepared in advance to simulate the reservoir rock structure and rock physical properties. Optionally, when preparing the simulated drilling samples, the target layer and wellbore conditions for the fracturing construction may be selected, the corresponding layer outcrops of the target layer may be selected, and the simulated drilling samples may be prepared in batches according to the rock structure and physical properties, and holes of a size proportional to that of the actual construction may be drilled in the simulated drilling samples.

[0034] Specifically, a corresponding simulation is performed for the actual fracturing process, and multiple groups of simulated cementing wellbores and simulated drilling samples for simulating rock formations are prepared for multi-stage fracturing, thereby obtaining at least one group of cementing wellbores and simulated drilling samples for simulating multi-stage fracturing.

[0035] S120, performing hydraulic fracturing simulation according to the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters.

[0036] Among them, the cementing quality change parameter can be a parameter of the degree of change of the cementing wellbore under different fracturing conditions after hydraulic fracturing simulation of the simulated drilling sample; the cementing quality change parameter can be a cementing quality change curve that determines the cementing wellbore under different fracturing conditions.

[0037] Specifically, corresponding hydraulic fracturing simulations are performed for each group of cemented wellbores and simulated drilling samples. After the hydraulic fracturing simulation is performed on each group of cemented wellbores, the cementing quality change parameters are obtained through acoustic wave test collection and quantitative evaluation.

[0038] S130, quantitatively evaluating the cementing quality of the cementing wellbore according to the cementing quality change parameter, and determining a target evaluation result.

[0039] Among them, cementing quality can be achieved by cementing the casing and the wellbore to form a good bond and prevent the formation fluid from passing through the annulus. The quality of cementing can be quantitatively evaluated and analyzed through cementing quality.

[0040] The target evaluation result may be a quality evaluation of different cementing areas. The target evaluation result may be used to determine the performance of cementing design in actual construction projects based on the changes in cementing wellbores with different cementing areas under hydraulic fracturing simulation.

[0041] Specifically, the cementing quality change parameters of the cementing wellbore are measured to determine the change in cementing quality of the cementing wellbore during the hydraulic fracturing simulation process, and the target evaluation result is determined through a quantitative evaluation of the cementing quality.

[0042] Optionally, when conducting a quantitative assessment of cementing quality, the degree of change of each group of cemented wellbores under hydraulic fracturing simulation is recorded, and then a series of curves are drawn for the casing wave amplitude change amplitude corresponding to different cementing ratios of the first cementing surface and the formation wave amplitude change amplitude corresponding to different cementing ratios of the second cementing surface, and then a first cementing surface cementing quality change curve plate and a second cementing surface cementing quality change curve plate corresponding to different hydraulic fracturing construction pressures and hydraulic fracturing construction times are drawn; and a first cementing surface cementing quality change curve plate and a second cementing surface cementing quality change curve plate corresponding to different hydraulic fracturing construction pressures, hydraulic fracturing construction times, and hydraulic fracturing construction times are drawn.

[0043] The technical solution of the embodiment of the present invention can systematically, comprehensively and objectively simulate the multi-stage fracturing process through a variety of simulated drilling samples by acquiring at least one group of cementing wellbore and simulated drilling samples for simulating multi-stage fracturing, and can effectively improve the accuracy and credibility of the evaluation; hydraulic fracturing simulation is performed based on the cementing wellbore and the simulated drilling samples to determine cementing quality change parameters, and the change data of the cementing wellbore during the hydraulic fracturing process can be effectively observed through simulation, and the simulated structure of the cementing wellbore can be effectively analyzed, and the hydraulic fracturing simulation can effectively control variables to obtain more accurate fracturing data, thereby improving the accuracy of the evaluation; based on the cementing quality The cementing quality of the cementing wellbore is quantitatively evaluated by quantitative change parameters, and the target evaluation result is determined. The evaluation through cementing quality change parameters can effectively explain the changes of the cementing wellbore during the hydraulic fracturing construction process, and can make corresponding predictions based on the actual construction process, which solves the technical problem that it is difficult to predict and evaluate the cementing quality during the hydraulic fracturing process in the prior art, realizes a complete simulation of the hydraulic well fracturing construction process, and can intuitively and quantify the degree of cementing quality change under different fracturing conditions, thereby improving the cementing quality safety, ensuring the safe production of the hydraulic fracturing construction process, and reducing construction risks.

[0044] Embodiment 2

[0045] Figure 3 1 is a flow chart of another method for evaluating cementing quality by multi-stage fracturing provided in the second embodiment of the present invention. The relationship between this embodiment and the above embodiment is the specific method for performing hydraulic fracturing simulation. Figure 3 As shown, the method for evaluating the cementing quality by multi-stage fracturing includes:

[0046] S310, obtaining at least one set of cementing wellbore and simulated drilling samples for simulating multi-stage fracturing.

[0047] S320, performing quality inspection on each group of cementing wellbores according to a preset cementing quality inspection method, and determining a first quality curve of the cementing wellbores.

[0048] The preset cementing quality detection method may be a method pre-set to detect cementing quality. Optionally, the preset cementing quality detection method may be an automatic acoustic emission test of the cementing wellbore from the bottom of the well to the wellhead through an indoor emission device.

[0049] The first quality curve can be used to represent the change range curve of cementing quality of cementing wellbore. The first quality curve can be used as a reference object for simulation test, and the change degree of cementing quality of cementing wellbore after hydraulic fracturing simulation under different fracturing conditions can be referenced through the first quality curve.

[0050] Specifically, the quality of each group of cemented wellbores is tested by a preset cementing quality testing method to obtain a first quality curve of the cemented wellbores, wherein each group of cemented wellbores simulates different types of cemented wellbores.

[0051] Optionally, in another optional embodiment of the present invention, the method of performing quality inspection on each group of cemented wellbores according to a preset cementing quality inspection method to determine a first quality curve of the cemented wellbores includes:

[0052] According to a preset cementing quality detection method, quality detection is performed on each group of cemented wellbores to determine a second quality curve corresponding to the first cementing surface of the cemented wellbores and a third quality curve corresponding to the second cementing surface; the first quality curve of the cemented wellbores is determined based on the second quality curve and the third quality curve.

[0053] Among them, the second quality curve can be a series of curves of casing wave amplitude change corresponding to different cementation ratios of the first cementation surface; the second quality curve can be a series of curves of formation wave amplitude change corresponding to different cementation ratios of the second cementation surface.

[0054] Among them, the first bonding surface can be the contact surface between the casing and the cement, and the first bonding surface can represent the size of the direct contact surface between the casing and the cement by the first bonding surface area or the first bonding surface ratio; the second bonding surface can be the contact surface between the formation and the cement, and the second bonding surface can represent the size of the direct contact surface between the formation and the cement by the second bonding surface area or the second bonding surface ratio.

[0055] Specifically, the quality of each group of cemented wellbores is inspected by a preset cementing quality inspection method to determine the second quality curve corresponding to the first bonding surface and the third quality curve corresponding to the second bonding surface of each group of cemented wellbores, and the first quality curve of the cemented wellbores is drawn according to the second quality curve and the third quality curve.

[0056] S330: Prepare a simulated sample according to the cementing wellbore and the simulated drilling sample to determine a hydraulic fracturing simulation sample.

[0057] The hydraulic fracturing simulation samples may be samples obtained by simulating the construction of cementing wellbore and simulated drilling samples according to the on-site construction process.

[0058] Optionally, when preparing the hydraulic fracturing simulation sample, according to the actual drilling conditions on site, a proportional wellbore is drilled on the top surface of the simulated drilling sample, and a hole is preset in the center of the cementing wellbore according to the on-site perforation parameters. Figure 4 Schematic diagram of pre-setting holes in a cementing wellbore according to an embodiment of the present invention. Figure 4As shown, the cementing wellbore is drilled separately. After the cementing wellbore is drilled, the cement formula used in the actual field conditions is used for preparation, and the cement is poured into the wellbore. The prepared cementing wellbore with holes is then slowly lowered to the bottom of the well, and the wellbore is vibrated with a vibrator. The vibration is stopped after no obvious bubbles are seen returning. The sample is placed intact in a water tank for maintenance. After the sample is maintained, ethylene is poured into the cementing wellbore to dissolve the foam blocking the holes, and a micro hydraulic jet gun is lowered to the holes for sandblasting. The holes formed at the holes simulate the morphology of the on-site perforation holes, completing the preparation of the hydraulic fracturing simulation sample. Exemplary, Figure 5 Schematic diagram of sandblasting at the hole through a micro hydraulic jet gun provided in an embodiment of the present invention. Figure 5 As shown, sand blasting is performed in a cementing wellbore through a high-pressure nozzle of a micro hydraulic jet gun.

[0059] Specifically, simulated sample preparation is performed on the cemented wellbore and the simulated drilling sample to obtain a hydraulic fracturing simulation sample for hydraulic fracturing simulation.

[0060] S340, performing a pressurization simulation on the hydraulic fracturing simulation sample to determine a cementing quality evaluation sample.

[0061] The cementing quality evaluation sample may be a sample obtained by hydraulically pressurizing a hydraulic fracturing simulation sample. The cementing quality evaluation sample may be used to quantitatively evaluate the cementing quality under hydraulic fracturing.

[0062] Specifically, a pressurization simulation is performed on the hydraulic fracturing simulation sample to obtain a cementing quality evaluation sample, and a cementing quality change parameter is determined according to the cementing quality evaluation sample and the first quality curve.

[0063] Optionally, in another optional embodiment of the present invention, the step of performing a pressurization simulation on the hydraulic fracturing simulation sample to determine a cementing quality evaluation sample includes:

[0064] Acquire at least one set of pressurization simulation experimental data corresponding to the pressurization simulation; wherein the pressurization simulation experimental data includes at least one of the number of simulations, the simulation pressure and the simulation time; pressurize the hydraulic fracturing simulation sample according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

[0065] Among them, the boosting simulation experiment data can be the simulation parameters pre-set when performing hydraulic fracturing simulation; the boosting simulation experiment data includes at least one of the number of simulations, simulation pressure and simulation time; the number of simulations can be the number of times the hydraulic fracturing simulation sample is pressurized according to the same boosting pressure and boosting time when performing boosting simulation on the hydraulic fracturing simulation sample; the simulation pressure can be the pressure applied to the hydraulic fracturing simulation sample during the hydraulic boosting simulation; the simulation time can be the duration of the simulated pressure applied to the hydraulic fracturing simulation sample during the hydraulic boosting simulation.

[0066] Specifically, when performing the boosting simulation, the boosting simulation experimental data corresponding to each boosting simulation of each group of hydraulic fracturing simulation samples is obtained, and the hydraulic fracturing simulation samples are boosted according to the boosting simulation experimental data to obtain cementing quality evaluation samples.

[0067] Optionally, in another optional embodiment of the present invention, pressurizing the hydraulic fracturing simulation sample according to the pressurization simulation experimental data to determine the cementing quality evaluation sample includes:

[0068] The hydraulic fracturing simulation sample is subjected to geostress loading by a three-dimensional geostress loading system to determine a fracturing pressurization sample; the fracturing pressurization sample is pressurized by a fracturing pumping system according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

[0069] The fracturing and pressurization sample may be a fracturing and pressurization sample obtained by subjecting the hydraulic fracturing and pressurization sample to ground stress loading in a stratum simulating actual construction conditions.

[0070] The three-dimensional geostress loading system can be an experimental device for simulating geological body stress, and can be used to simulate the stress state of the geological body underground. Optionally, the hydraulic fracturing simulation sample is placed in the three-dimensional geostress loading system, and the geostress is loaded on the six surfaces of the rock of the hydraulic fracturing simulation sample through the three-dimensional geostress loading system to simulate the formation stress according to the actual working conditions.

[0071] Among them, the fracturing pumping system can be used as a simulation device for fracturing operations on formations.

[0072] Specifically, a hydraulic fracturing simulation sample is placed in a three-dimensional geostress loading system, geostress is loaded on the hydraulic fracturing simulation sample through the three-dimensional geostress loading system, a fracturing pressurization sample is determined, and the fracturing pressurization sample is pressurized according to the pressurization simulation experimental data through the wellhead connection of the fracturing pumping system and the cementing wellbore of the fracturing pressurization sample to determine the cementing quality evaluation sample.

[0073] Optionally, in another optional embodiment of the present invention, the step of pressurizing the fracturing and pressurizing sample according to the pressurization simulation experimental data by the fracturing pumping system to determine the cementing quality evaluation sample includes:

[0074] When the simulated pressure is increased on the fracturing and pressurizing sample by the fracturing pumping system, the actual pressurization time of the fracturing and pressurizing sample is recorded; if the actual pressurization time reaches the simulation time, the effective pressurization times of the fracturing and pressurizing sample are increased once; if the effective pressurization times are less than the simulation times, the operation of increasing the simulated pressure on the fracturing and pressurizing sample by the fracturing pumping system is returned to be executed; if the effective pressurization times are equal to the simulation times, the fracturing and pressurizing sample is determined as the cementing quality evaluation sample.

[0075] The actual pressurization time may be the time that the fracturing pumping system pressurizes the fracturing pressurization sample, and the effective pressurization times may be the number of times that the fracturing pumping system pressurizes the fracturing pressurization sample.

[0076] Specifically, the wellhead of the cementing wellbore of the fracturing and pressurizing sample is connected through the fracturing pumping system, the simulated pressure is increased on the fracturing and pressurizing sample through the fracturing pumping system, and the actual pressurization time of the fracturing and pressurizing sample increased by the fracturing pumping system is recorded. When the actual pressurization time reaches the simulation time, the effective pressurization times of the fracturing and pressurizing sample are recorded, and the relationship between the effective pressurization times and the simulation times is judged. If the effective pressurization times are less than the simulation times, the operation of increasing the simulated pressure of the fracturing and pressurizing sample through the fracturing pumping system is repeated. When the effective pressurization times are equal to the simulation times, the pressure simulation of increasing the simulated pressure of the fracturing and pressurizing sample is ended, and the fracturing and pressurizing sample is determined as the cementing quality evaluation sample.

[0077] Optionally, when increasing the simulated pressure of the fracturing and pressurizing sample through the fracturing pumping system, different simulation times, simulated pressures and simulation times are selected to increase the simulated pressure of the fracturing and pressurizing sample. By controlling the values ​​of the simulation times, simulated pressures and simulation times, multiple different simulation times, simulated pressures and simulation times are obtained to determine different cementing quality evaluation samples.

[0078] Optionally, by performing quality inspection on different cementing quality evaluation samples, the acoustic wave quality data under different simulation times, simulation pressures and simulation times are obtained, and quantitative evaluation is performed in turn according to each group of acoustic wave quality data and the first quality curve, and cementing quality change curves corresponding to the first cementing surface and the second cementing surface under the simulation times, simulation pressures and simulation times are respectively drawn, and cementing quality change curves corresponding to different first cementing surfaces and second cementing surfaces are drawn according to the cementing quality change curves corresponding to the first cementing surface and the second cementing surface corresponding to each group of cementing quality evaluation samples as cementing quality change parameters. Among them, the cementing quality change parameter can be two cementing quality change curves, namely, the cementing quality change curve corresponding to the first cementing surface and the cementing quality change curve corresponding to the second cementing surface.

[0079] S350: Determine cementing quality change parameters according to the cementing quality evaluation sample and the first quality curve.

[0080] Specifically, the cementing quality change parameter is determined according to the cementing quality evaluation sample and the first quality curve.

[0081] Optionally, in another optional embodiment of the present invention, determining cementing quality change parameters according to the cementing quality evaluation sample and the first quality curve includes:

[0082] The cementing quality evaluation sample is quality tested according to a preset cementing quality testing method to determine the acoustic wave quality data; a quantitative evaluation is performed according to the acoustic wave quality data and the first quality curve to determine the cementing quality change parameter.

[0083] The acoustic wave quality data may be obtained by testing the cementing quality evaluation sample using a cementing quality detection method. Optionally, the acoustic wave quality data may be obtained by performing an automatic acoustic emission test from the bottom of the well to the wellhead on the cementing wellbore of the cementing quality evaluation sample.

[0084] Specifically, the cementing wellbore of the cementing quality evaluation sample is quality tested by a preset cementing quality test method to obtain acoustic wave quality data, and a quantitative evaluation is performed using the acoustic wave quality data and the first quality curve to determine the degree of change in cementing quality of the cementing wellbore after hydraulic fracturing simulation, and a quantitative evaluation is performed based on the acoustic wave quality data and the first quality curve to determine cementing quality change parameters.

[0085] S360: quantitatively evaluate the cementing quality of the cementing wellbore according to the cementing quality change parameter to determine a target evaluation result.

[0086] The technical solution of the embodiment of the present invention is to obtain at least one group of cementing wellbores and simulated drilling samples for simulating multi-stage fracturing; perform quality inspection on each group of cementing wellbores according to a preset cementing quality inspection method, and determine a first quality curve of the cementing wellbores. The quality curve can effectively represent the change in cementing quality, thereby improving the efficiency of evaluating cementing quality; perform simulation sample preparation based on the cementing wellbores and the simulated drilling samples, determine hydraulic fracturing simulation samples, meet research needs through sample preparation, and improve simulation efficiency and effect; perform pressurization simulation on the hydraulic fracturing simulation samples, determine cementing quality evaluation samples, and determine cementing quality change parameters based on the cementing quality evaluation samples and the first quality curve. The cementing quality of the cementing wellbore is quantitatively evaluated according to the cementing quality change parameters to determine the target evaluation result. The evaluation through the cementing quality change parameters can effectively explain the changes of the cementing wellbore during the hydraulic fracturing construction process, and can make corresponding predictions based on the actual construction process, thereby solving the technical problem that it is difficult to predict and evaluate the cementing quality during the hydraulic fracturing process in the prior art, and realizing a complete simulation of the hydraulic well fracturing construction process. It can intuitively and quantitatively obtain the degree of cementing quality change under different fracturing conditions, thereby improving the cementing quality safety, ensuring the safe production of the hydraulic fracturing construction process, and reducing construction risks.

[0087] Embodiment 3

[0088] Figure 6 Schematic diagram of a device for evaluating cementing quality by multi-stage fracturing provided in the fourth embodiment of the present invention. Figure 6 As shown, the device includes: a sample preparation module 610, a fracturing simulation module 620 and a quality assessment module 630, wherein,

[0089] A sample preparation module 610 is used to obtain at least one set of cemented wellbore and simulated drilling samples for simulating multi-stage fracturing;

[0090] A fracturing simulation module 620, for performing hydraulic fracturing simulation according to the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters;

[0091] The quality assessment module 630 is used to quantitatively assess the cementing quality of the cementing wellbore according to the cementing quality change parameter to determine a target assessment result.

[0092] The technical solution of the embodiment of the present invention can systematically, comprehensively and objectively simulate the multi-stage fracturing process through a variety of simulated drilling samples by acquiring at least one group of cementing wellbore and simulated drilling samples for simulating multi-stage fracturing, and can effectively improve the accuracy and credibility of the evaluation; hydraulic fracturing simulation is performed based on the cementing wellbore and the simulated drilling samples to determine cementing quality change parameters, and the change data of the cementing wellbore during the hydraulic fracturing process can be effectively observed through simulation, and the simulated structure of the cementing wellbore can be effectively analyzed, and the hydraulic fracturing simulation can effectively control variables to obtain more accurate fracturing data, thereby improving the accuracy of the evaluation; based on the cementing quality The cementing quality of the cementing wellbore is quantitatively evaluated by quantitative change parameters, and the target evaluation result is determined. The evaluation through cementing quality change parameters can effectively explain the changes of the cementing wellbore during the hydraulic fracturing construction process, and can make corresponding predictions based on the actual construction process, which solves the technical problem that it is difficult to predict and evaluate the cementing quality during the hydraulic fracturing process in the prior art, realizes a complete simulation of the hydraulic well fracturing construction process, and can intuitively and quantify the degree of cementing quality change under different fracturing conditions, thereby improving the cementing quality safety, ensuring the safe production of the hydraulic fracturing construction process, and reducing construction risks.

[0093] Optionally, the fracturing simulation module is specifically used for:

[0094] Performing quality inspection on each group of cementing wellbores according to a preset cementing quality inspection method to determine a first quality curve of the cementing wellbores;

[0095] Prepare a simulated sample according to the cementing wellbore and the simulated drilling sample to determine a hydraulic fracturing simulated sample;

[0096] Performing a pressurization simulation on the hydraulic fracturing simulation sample to determine a cementing quality evaluation sample;

[0097] A cementing quality change parameter is determined according to the cementing quality evaluation sample and the first quality curve.

[0098] Optionally, the fracturing simulation module is further used for:

[0099] Performing quality testing on the cementing quality evaluation sample according to a preset cementing quality testing method to determine acoustic wave quality data;

[0100] A quantitative evaluation is performed based on the acoustic wave quality data and the first quality curve to determine the cementing quality change parameter.

[0101] Optionally, the fracturing simulation module is further used for:

[0102] Acquire at least one set of supercharging simulation experimental data corresponding to the supercharging simulation; wherein the supercharging simulation experimental data includes at least one of the number of simulations, the simulation pressure and the simulation time;

[0103] The hydraulic fracturing simulation sample is pressurized according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

[0104] Optionally, the fracturing simulation module is further used for:

[0105] Performing geostress loading on the hydraulic fracturing simulation sample through a three-dimensional geostress loading system to determine a fracturing pressurized sample;

[0106] The fracturing and pressurizing sample is pressurized by a fracturing pumping system according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

[0107] Optionally, the fracturing simulation module is further used for:

[0108] When the simulated pressure is increased on the fracturing pressurized sample by the fracturing pumping system, recording the actual pressurization time of the fracturing pressurized sample;

[0109] If the actual pressurization time reaches the simulation time, the effective pressurization times of the fracturing pressurization sample are increased by one;

[0110] If the effective pressurization times are less than the simulation times, returning to execute the operation of increasing the simulated pressure of the fracturing pressurization sample through the fracturing pumping system;

[0111] If the effective pressurization times are equal to the simulation times, the fracturing pressurization sample is determined as the cementing quality evaluation sample.

[0112] Optionally, the fracturing simulation module is further used for:

[0113] Performing quality inspection on each group of cemented wellbores according to a preset cementing quality inspection method, and determining a second quality curve corresponding to a first cementing surface and a third quality curve corresponding to a second cementing surface of the cemented wellbores;

[0114] A first quality curve for the cemented wellbore is determined based on the second quality curve and the third quality curve.

[0115] The device for evaluating the quality of cementing by multi-stage fracturing provided in the embodiment of the present invention can execute the method for evaluating the quality of cementing by multi-stage fracturing provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0116] Embodiment 4

[0117] Figure 7 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0118] like Figure 7 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0119] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0120] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for evaluating cementing quality by multi-stage fracturing.

[0121] In some embodiments, the method for evaluating the quality of cementing by multi-stage fracturing can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for evaluating the quality of cementing by multi-stage fracturing described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for evaluating the quality of cementing by multi-stage fracturing in any other appropriate manner (for example, by means of firmware).

[0122] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0123] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0124] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0125] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0126] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0127] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0128] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0129] Embodiment 5

[0130] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the method for evaluating cementing quality by multi-stage fracturing provided in any embodiment of the present invention are implemented. The method includes:

[0131] obtaining at least one set of cemented wellbore and simulated drilling samples simulating multi-stage fracturing;

[0132] Performing hydraulic fracturing simulation based on the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters;

[0133] The cementing quality of the cementing wellbore is quantitatively evaluated according to the cementing quality change parameter to determine a target evaluation result.

[0134] The computer storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0135] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0136] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0137] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0138] It should be understood by those skilled in the art that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, optionally, they can be implemented by a program code executable by a computer device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0139] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0140] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for evaluating the quality of cementing by multi-stage fracturing, characterized in that: include: obtaining at least one set of cemented wellbore and simulated drilling samples simulating multi-stage fracturing; Performing hydraulic fracturing simulation based on the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters; The cementing quality of the cementing wellbore is quantitatively evaluated according to the cementing quality change parameter to determine a target evaluation result.

2. The method according to claim 1, characterized in that , the hydraulic fracturing simulation is performed according to the cementing wellbore and the simulated drilling sample to determine the cementing quality change parameters, including: Performing quality inspection on each group of cementing wellbores according to a preset cementing quality inspection method to determine a first quality curve of the cementing wellbores; Prepare a simulated sample according to the cementing wellbore and the simulated drilling sample to determine a hydraulic fracturing simulated sample; Performing a pressurization simulation on the hydraulic fracturing simulation sample to determine a cementing quality evaluation sample; According to the cementing quality evaluation sample and the first quality curve, a curve is determined to quantitatively evaluate cementing quality change parameters under different fracturing conditions.

3. The method according to claim 2, characterized in that The step of determining cementing quality change parameters according to the cementing quality evaluation sample and the first quality curve includes: Performing quality testing on the cementing quality evaluation sample according to a preset cementing quality testing method to determine acoustic wave quality data; A quantitative evaluation is performed based on the acoustic wave quality data and the first quality curve to determine the cementing quality change parameter.

4. The method according to claim 2, characterized in that , said performing a pressurization simulation on the hydraulic fracturing simulation sample to determine a cementing quality evaluation sample, comprises: Acquire at least one set of supercharging simulation experimental data corresponding to the supercharging simulation; wherein the supercharging simulation experimental data includes at least one of the number of simulations, the simulation pressure and the simulation time; The hydraulic fracturing simulation sample is pressurized according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

5. The method according to claim 4, characterized in that , pressurizing the hydraulic fracturing simulation sample according to the pressurization simulation experimental data to determine the cementing quality evaluation sample, including: Performing geostress loading on the hydraulic fracturing simulation sample through a three-dimensional geostress loading system to determine a fracturing pressurized sample; The fracturing and pressurizing sample is pressurized by a fracturing pumping system according to the pressurization simulation experimental data to determine the cementing quality evaluation sample.

6. The method according to claim 5, characterized in that , the fracturing and pressurizing sample is pressurized by the fracturing pumping system according to the pressurization simulation experimental data to determine the cementing quality evaluation sample, including: When the simulated pressure is increased on the fracturing pressurized sample by the fracturing pumping system, recording the actual pressurization time of the fracturing pressurized sample; If the actual pressurization time reaches the simulation time, the effective pressurization times of the fracturing pressurization sample are increased by one; If the effective pressurization times are less than the simulation times, returning to execute the operation of increasing the simulated pressure of the fracturing pressurization sample through the fracturing pumping system; If the effective pressurization times are equal to the simulation times, the fracturing pressurization sample is determined as the cementing quality evaluation sample.

7. The method according to claim 2, characterized in that , the method of performing quality inspection on each group of cementing wellbores according to a preset cementing quality inspection method to determine a first quality curve of the cementing wellbores includes: Performing quality inspection on each group of cemented wellbores according to a preset cementing quality inspection method, and determining a second quality curve corresponding to a first cementing surface and a third quality curve corresponding to a second cementing surface of the cemented wellbores; A first quality curve for the cemented wellbore is determined based on the second quality curve and the third quality curve.

8. A device for evaluating the quality of cementing by multi-stage fracturing, characterized in that: include: A sample preparation module for obtaining at least one set of cemented wellbore and simulated drilling samples for simulating multi-stage fracturing; A fracturing simulation module, used to perform hydraulic fracturing simulation based on the cementing wellbore and the simulated drilling sample to determine cementing quality change parameters; The quality assessment module is used to quantitatively assess the cementing quality of the cementing wellbore according to the cementing quality change parameter to determine a target assessment result.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for evaluating cementing quality by multi-stage fracturing as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for evaluating cementing quality by multi-stage fracturing as described in any one of claims 1-7 when executed.

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