Method for determining the anti-channeling capacity of a cement slurry based on a loss curve and a processor

Abstract

The application relates to the technical field of well cementing, in particular to a method for determining the channeling prevention capability of cement slurry based on a loss curve and a processor. The method comprises the following steps: acquiring actual temperature and actual pressure of an oil and gas well to be observed; inputting the actual temperature and the actual pressure into a testing device to enable the testing device to set a simulation test environment according to the actual temperature and the actual pressure; acquiring a plurality of liquid column pressure data generated by target cement slurry in the simulation test environment according to a preset frequency, wherein the target cement slurry is cement slurry with conventional performance meeting a preset standard; fitting the plurality of liquid column pressure data to determine a loss curve of the target cement slurry in the simulation test environment; determining the number of times of changes of the slope in the loss curve greater than a first preset value; determining the curve type of the loss curve according to the number of times of changes, and determining the channeling prevention capability of the target cement slurry according to the curve type. The above scheme can quickly determine the channeling prevention capability of the cement slurry corresponding to the loss curve.

Description

Technical Field

[0001] This application relates to the field of cementing technology, and more specifically to a method, processor, device, and storage medium for determining the anti-channeling capability of cement slurry based on a weight loss curve. Background Technology

[0002] The development of oil and gas wells, especially natural gas wells, often faces the thorny problem of annular gas channeling. Under certain temperature and pressure conditions, as the hydration reaction of cement slurry proceeds, the transformation from liquid cement slurry to solid cement stone mainly involves four stages: liquid phase, gelation, solidification, and hardening. During the gelation stage, cement slurry is prone to gas channeling. Channeling gas may escape from the wellhead along the micro-annular gaps between the cement slurry matrix or the first and second interfaces. This can lead to wellhead uplift and waste of oil and gas resources, or even serious blowout accidents. Currently, the evaluation of cement slurry's anti-channeling capability mainly relies on methods such as the latent gas channeling factor method, cement slurry performance response coefficient method, gelation water loss coefficient method, resistance coefficient method, and cement slurry performance coefficient method. However, the gelation weight loss during the cement slurry setting process is the most important factor leading to early gas channeling. Therefore, evaluating the weight loss pressure of cement slurry and maintaining wellbore pressure balance is fundamental to controlling and predicting annular gas channeling. However, existing technologies do not evaluate the degree of gas channeling in cement slurry based on weight loss pressure. Summary of the Invention

[0003] The purpose of this application is to provide a method, processor, device, and storage medium for determining the anti-channeling capability of cement slurry based on a weight loss curve.

[0004] To achieve the above objectives, embodiments of this application provide a method for determining the anti-channeling capability of cement slurry based on a weight loss curve, the method comprising:

[0005] Obtain the actual temperature and pressure downhole of the oil and gas well to be observed;

[0006] Input the actual temperature and actual pressure into the testing device so that the testing device sets up the simulated testing environment according to the actual temperature and actual pressure.

[0007] Multiple liquid column pressure data generated by the target cement slurry in the simulated test environment are acquired at a preset frequency. The target cement slurry is a conventional cement slurry with performance that meets the preset standards.

[0008] Multiple liquid column pressure data were fitted to determine the weight loss curve of the target cement slurry in a simulated test environment;

[0009] Determine the number of times the slope of the weightlessness curve changes greater than a first preset value;

[0010] The type of weight loss curve is determined based on the number of changes, and the anti-channeling ability of the target cement slurry is determined based on the curve type.

[0011] In this embodiment of the application, determining the curve type of the weight loss curve based on the number of changes, and determining the anti-channeling capability of the target cement slurry based on the curve type includes: when the number of changes is a preset number, obtaining the first slope of the weight loss curve before the slope change is greater than a first preset value and the second slope after the slope change is greater than the first preset value; when the ratio of the first slope to the second slope is less than a second preset value, determining that the anti-channeling capability of the target cement slurry does not need to be optimized; when the ratio of the first slope to the second slope is greater than the second preset value, determining that the anti-channeling capability of the target cement slurry needs to be optimized.

[0012] In this embodiment of the application, when the ratio of the first slope to the second slope is greater than a second preset value, determining that the anti-channeling ability of the target cement slurry needs to be optimized includes: determining a cement slurry admixture that changes the anti-channeling ability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; and changing the dosage of the cement slurry admixture to optimize the anti-channeling ability of the target cement slurry.

[0013] In this embodiment of the application, the method further includes: when the number of changes is greater than a preset number, determining that the anti-channeling ability of the target cement slurry needs to be optimized.

[0014] In this embodiment of the application, when the number of changes is greater than a preset number, determining that the anti-channeling ability of the target cement slurry needs to be optimized includes: determining a cement slurry admixture that changes the anti-channeling ability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; obtaining a third slope before the first slope change is greater than a first preset value and a fourth slope after the first slope change is greater than the first preset value; when the ratio of the third slope to the fourth slope is less than a second preset value, changing the amount of cement slurry admixture to optimize the anti-channeling ability of the target cement slurry; when the ratio of the third slope to the fourth slope is greater than the second preset value, changing the type of cement slurry admixture to optimize the anti-channeling ability of the target cement slurry.

[0015] In this embodiment of the application, the method further includes: when multiple weight loss curves are obtained, and the number of times the slope of each weight loss curve changes by more than a first preset value is greater than a preset number, determining the target duration corresponding to the slope of each weight loss curve being within a preset range; for each weight loss curve, determining the anti-channeling ability of the cement slurry corresponding to the weight loss curve based on the target duration of the weight loss curve, wherein the longer the target duration corresponding to the weight loss curve, the worse the anti-channeling ability of the cement slurry corresponding to the weight loss curve.

[0016] In this embodiment of the application, fitting multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment corresponding to the testing device includes: determining the weight loss pressure data corresponding to each liquid column pressure data; fitting the weight loss pressure data to determine the weight loss curve; wherein, the weight loss pressure value P corresponding to each weight loss pressure data is determined by formula (1). loss :

[0017] P loss =gρ c L c -P l Formula (1)

[0018] Where g is the acceleration due to gravity; ρ c L represents the density of the cement paste. c P is the length of the cement grout column; l This represents the liquid column pressure value.

[0019] A second aspect of this application provides a processor configured to perform a method for determining the anti-channeling capability of cement slurry based on a weight loss curve according to any one of the foregoing.

[0020] A third aspect of this application provides an apparatus for determining the anti-channeling capability of cement slurry based on a weight loss curve, the apparatus including the processor as described above.

[0021] A fourth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform a method for determining the anti-crossing capability of cement slurry based on a weightlessness curve according to any one of the foregoing.

[0022] The above technical solution allows the processor to determine the anti-channeling capability of the target cement slurry by acquiring the weight loss curve of the target cement slurry in the simulation test device and judging the weight loss curve.

[0023] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0025] Figure 1 The flowchart schematically illustrates a method for determining the anti-channeling capability of cement slurry based on a weight loss curve according to an embodiment of this application;

[0026] Figure 2 An example diagram illustrating a weightlessness curve according to an embodiment of this application is shown.

[0027] Figure 3 An example diagram illustrating a weightlessness curve according to another embodiment of this application is shown.

[0028] Figure 4 An example diagram illustrating a weightlessness curve according to yet another embodiment of this application is shown;

[0029] Figure 5 The diagram illustrates the internal structure of a computer device according to an embodiment of this application. Detailed Implementation

[0030] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0031] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0033] like Figure 1 The diagram illustrates a flowchart of a method for determining the anti-channeling capability of cement slurry based on a weight loss curve, according to an embodiment of this application. Figure 1 As shown, a method for determining the anti-channeling capability of cement slurry based on weight loss curves is provided, including the following steps:

[0034] Step 101: Obtain the actual temperature and pressure downhole of the oil and gas well to be observed;

[0035] Step 102: Input the actual temperature and actual pressure into the testing device so that the testing device sets up the simulated testing environment according to the actual temperature and actual pressure;

[0036] Step 103: Acquire multiple liquid column pressure data generated by the target cement slurry in the simulated test environment at a preset frequency, wherein the target cement slurry is a conventional cement slurry with performance meeting the preset standards.

[0037] Step 104: Fit multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment;

[0038] Step 105: Determine the number of times the slope of the weightlessness curve changes more than the first preset value;

[0039] Step 106: Determine the type of the weight loss curve based on the number of changes, and determine the anti-channeling capability of the target cement slurry based on the curve type.

[0040] The processor can acquire the actual temperature and pressure downhole of the oil and gas well under observation. Based on the acquired actual temperature and pressure, it performs simulation tests. The processor can input the actual temperature and pressure into the testing device, causing the testing device to set up the simulation test environment according to the actual temperature and pressure input by the processor. The processor can acquire multiple liquid column pressure data generated by the target cement slurry in the simulation test environment at a preset frequency. The target cement slurry can be a conventional cement slurry with performance conforming to preset standards. For example, assuming the processor sets the relevant provisions for cement slurry in GB / T 19139-2012 "Test Methods for Cement in Oil Wells" as the preset standard, the target cement slurry can be a conventional cement slurry with performance conforming to the relevant provisions of GB / T 19139-2012 "Test Methods for Cement in Oil Wells". The processor fits the acquired multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulation test environment. After obtaining the weight loss curve corresponding to the target cement slurry, the processor can determine the type of the weight loss curve. The processor can determine the number of times the slope of the weight loss curve changes by more than a first preset value, determine the curve type of the weight loss curve based on the number of changes, and thus determine the anti-channeling capability of the target cement slurry based on the curve type of the weight loss curve corresponding to the target cement slurry.

[0041] In one embodiment, determining the curve type of the weight loss curve based on the number of changes, and determining the anti-channeling capability of the target cement slurry based on the curve type, includes: when the number of changes is a preset number, obtaining a first slope before the slope change of the weight loss curve exceeds a first preset value and a second slope after the slope change exceeds the first preset value; if the ratio of the first slope to the second slope is less than a second preset value, determining that the anti-channeling capability of the target cement slurry does not need to be optimized; if the ratio of the first slope to the second slope is greater than a second preset value, determining that the anti-channeling capability of the target cement slurry needs to be optimized.

[0042] After determining the number of times the slope change in the weight loss curve corresponding to the target cement exceeds a first preset value, the processor can judge the curve type based on the number of changes and determine the anti-channeling capability of the target cement based on the curve type. The processor can set a preset number of changes based on user input. The processor can identify weight loss curves with the preset number of changes as the first type and judge the anti-channeling capability of the target cement slurry corresponding to the first type of weight loss curve. When the weight loss curve is of the first type, the processor can obtain the first slope before the slope change exceeds the first preset value and the first slope after the slope change exceeds the first preset value. For example, assuming the processor sets the preset number to one, that is, when the number of times the slope change exceeds the first preset value is greater than one, the processor can identify the slope of the weight loss curve before the change as the first slope and the slope of the weight loss curve after the change as the second slope. After determining the first slope and the second slope, the processor can determine the ratio of the first slope to the second slope. The processor can determine a second preset value based on user input data. When the processor determines that the ratio of the first slope to the second slope of the first type of weight loss curve is less than the processor-set second preset value, the processor can determine that it is not necessary to optimize the anti-channeling capability of the target cement slurry. Conversely, when the processor determines that the ratio of the first slope to the second slope is greater than the processor-set second preset value, the processor determines that it is necessary to optimize the anti-channeling capability of the target cement slurry. For example, assuming the processor-set second preset value is 10, that is, when the weight loss curve corresponding to the target cement is a first type of weight loss curve, the anti-channeling capability of the target cement corresponding to a weight loss curve with a ratio of the first slope to the second slope less than 10 is better than the anti-channeling capability of the target cement corresponding to a weight loss curve with a ratio of the first slope to the second slope greater than 10. For example, assuming the preset number of times is one... Figure 2 The weightlessness curve shown Figure 2 The number of times the slope of the weight loss curve changes by more than the first preset value is considered as one. The processor can determine the slope of the weight loss curve before the change as the first slope and the slope of the weight loss curve after the change as the second slope. Based on the ratio of the first slope and the second slope, the processor determines the anti-channeling capability of the target cement corresponding to the weight loss curve and determines whether the anti-channeling capability of the target cement needs to be optimized.

[0043] In one embodiment, when the ratio of the first slope to the second slope is greater than a second preset value, determining that the anti-channeling ability of the target cement slurry needs to be optimized includes: determining a cement slurry admixture that changes the anti-channeling ability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; and changing the dosage of the cement slurry admixture to optimize the anti-channeling ability of the target cement slurry.

[0044] When the processor determines that the weight loss curve of the target cement is a first type of weight loss curve, and the ratio of the first slope to the second slope of the weight loss curve is greater than a second preset value set by the processor, the processor can optimize the target cement slurry. The processor can first identify cement slurry admixtures that can alter the anti-channeling ability of the cement slurry. These admixtures may include at least one of a retarder, a water loss reducer, and an anti-channeling agent. For the target cement requiring optimization corresponding to the first type of weight loss curve, the processor can change the dosage of the cement slurry admixture to alter the anti-channeling ability of the target cement slurry, thereby optimizing the anti-channeling ability of the target cement slurry.

[0045] In one embodiment, the method further includes: determining that the anti-channeling capability of the target cement slurry needs to be optimized when the number of changes is greater than a preset number.

[0046] After determining the number of times the slope of the weight loss curve corresponding to the target cement changes by a value greater than a first preset value, the processor can classify the weight loss curve based on this number of changes and determine the anti-channeling capability of the target cement accordingly. The processor can set a preset number of changes based on user input. Weight loss curves with a number of changes greater than the preset number can be classified as a second type, and the anti-channeling capability of the target cement slurry corresponding to the second type of weight loss curve needs optimization.

[0047] In one embodiment, determining the need to optimize the anti-channeling capability of the target cement slurry when the number of changes exceeds a preset number includes: identifying a cement slurry admixture that alters the anti-channeling capability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; obtaining a third slope before the first slope change exceeds a first preset value and a fourth slope after the first slope change exceeds the first preset value; if the ratio of the third slope to the fourth slope is less than a second preset value, changing the amount of cement slurry admixture to optimize the anti-channeling capability of the target cement slurry; and if the ratio of the third slope to the fourth slope is greater than the second preset value, changing the type of cement slurry admixture to optimize the anti-channeling capability of the target cement slurry.

[0048] When the processor determines that the number of times the slope change in the weight loss curve exceeds a first preset value is greater than a preset number (i.e., the weight loss curve is of type two), the processor can identify cement slurry admixtures that can alter the anti-channeling ability of the cement slurry, such as retarders, water loss reducers, and anti-channeling agents. The processor can determine the third slope before the first slope change exceeds the first preset value and the fourth slope after the first slope change exceeds the first preset value in the type two weight loss curve. After determining the third and fourth slopes in the type two weight loss curve, the processor can determine the ratio of the third and fourth slopes. If the ratio of the third to fourth slopes is less than the second preset value set by the processor (the second preset value can be determined based on user input), the processor can determine that changing the amount of cement slurry admixture can optimize the anti-channeling ability of the target cement slurry. If the processor determines that the ratio of the third to fourth slopes is greater than the second preset value set by the processor, the processor can determine that changing the type of cement slurry admixture can optimize the anti-channeling ability of the target cement slurry. For example, assuming the preset number of times is one... Figure 3 The weightlessness curve shown Figure 3 The number of times the slope of the weight loss curve changes more than the first preset value is two. If the number of changes is greater than the preset number, the processor can determine the slope of the weight loss curve before the first change as the third slope and the slope of the weight loss curve after the first change as the fourth slope. Based on the ratio of the third slope and the fourth slope, the processor can determine how the target cement slurry corresponding to the weight loss curve should optimize its anti-channeling ability, such as changing the amount of cement slurry admixture or changing the type of cement slurry admixture.

[0049] In one embodiment, the method further includes: when multiple weight loss curves are obtained, and the number of times the slope change of each weight loss curve is greater than a first preset value is greater than a preset number, determining the target duration corresponding to the slope of each weight loss curve being within a preset range; for each weight loss curve, determining the anti-channeling ability of the cement slurry corresponding to the weight loss curve based on the target duration of the weight loss curve, wherein the longer the target duration corresponding to the weight loss curve, the worse the anti-channeling ability of the cement slurry corresponding to the weight loss curve.

[0050] After acquiring multiple weight loss curves corresponding to target cement slurries, the processor can determine the curve type of each weight loss curve based on the number of times the slope of each curve changes beyond a first preset value. When the processor acquires multiple weight loss curves, and the number of times the slope of each curve changes beyond the first preset value is greater than a preset number (i.e., when the processor acquires multiple weight loss curves, and each curve is of the second type), the processor can determine the target duration corresponding to the slope of each second-type weight loss curve within a preset range. The preset range of the slope can be determined based on user input data. For the acquired multiple second-type weight loss curves, the processor can determine the anti-channeling capability of the cement slurry corresponding to each weight loss curve based on the target duration of the weight loss curve. The processor can determine that the longer the target duration of the weight loss curve, the worse the anti-channeling capability of the cement slurry corresponding to that weight loss curve. For example, assuming... Figure 3 and Figure 4 These are different weight loss curves corresponding to different cement pastes, and all are of the second type. Assuming the slope is within a preset range set by the processor, assuming... Figure 3 The target duration corresponding to the slope of the weightlessness curve shown being within the preset range is 100 to 200 minutes, which means... Figure 3 The target duration of the corresponding weightlessness curve is 100 minutes. Assume... Figure 4 The target duration corresponding to the slope of the weightlessness curve shown being within the preset range is 125 to 175 minutes, which means... Figure 4 The target duration of the corresponding weightlessness curve is 50 minutes. The processor can then determine... Figure 3 The corresponding target duration ratio Figure 4 If the corresponding target duration is long, the processor can determine... Figure 3 The corresponding cement slurry's anti-channeling ability is compared to Figure 4 The corresponding cement slurry has poor anti-channeling ability.

[0051] In one embodiment, fitting multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment corresponding to the test device includes: determining the weight loss pressure data corresponding to each liquid column pressure data; fitting the weight loss pressure data to determine the weight loss curve; wherein, the weight loss pressure value P corresponding to each weight loss pressure data is determined by formula (1). loss :

[0052] P loss =gρ c L c -P l Formula (1)

[0053] Where g is the acceleration due to gravity; ρ c L represents the density of the cement paste.c P is the length of the cement grout column; l This represents the liquid column pressure value.

[0054] The processor can acquire multiple liquid column pressure data generated by the target cement slurry in the simulated test environment at a preset frequency, and use formula (1)P loss =gρ c L c -P l Where g is the acceleration due to gravity; ρ c L represents the density of the cement paste. c P is the length of the cement grout column; l The pressure value is the liquid column pressure. The corresponding weight loss pressure value is determined for each liquid column pressure value, and multiple weight loss pressure values ​​are fitted to obtain the weight loss curve corresponding to the target cement slurry.

[0055] In one embodiment, a processor is provided, configured to perform any of the above methods for determining the anti-channeling capability of cement slurry based on weight loss curves.

[0056] The above technical solution allows the processor to obtain the weight loss curve of the target cement slurry in the simulation test device, determine the anti-channeling capability of the target cement slurry by judging the weight loss curve, and determine the optimization direction for the cement slurry to be optimized based on the characteristics of different weight loss curves.

[0057] In one embodiment, a machine-readable storage medium is provided, on which instructions are stored, which, when executed by a processor, cause the processor to be configured to perform a method for determining the anti-crossing capability of cement slurry based on a weightlessness curve according to any one of the foregoing.

[0058] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0059] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 5As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown), and a database (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The database stores relevant data acquired by the testing device during the simulation process. The network interface A02 communicates with external terminals via a network connection. When executed by the processor A01, the computer program B02 implements a method for determining the anti-channeling capability of cement slurry based on a weight loss curve.

[0060] Figure 1 This is a flowchart illustrating a method for determining the anti-channeling capability of cement slurry based on a weight loss curve in one embodiment. It should be understood that, although... Figure 1 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0061] This application provides an apparatus including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: acquiring the actual temperature and pressure of the oil and gas well to be observed downhole; inputting the actual temperature and pressure into a testing device to set up a simulated testing environment according to the actual temperature and pressure; acquiring multiple liquid column pressure data generated by the target cement slurry in the simulated testing environment at a preset frequency, wherein the target cement slurry is a conventional cement slurry with performance conforming to preset standards; fitting the multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated testing environment; determining the number of times the slope of the weight loss curve changes greater than a first preset value; determining the curve type of the weight loss curve based on the number of changes, and determining the anti-channeling capability of the target cement slurry based on the curve type.

[0062] In one embodiment, determining the curve type of the weight loss curve based on the number of changes, and determining the anti-channeling capability of the target cement slurry based on the curve type, includes: when the number of changes is a preset number, obtaining a first slope before the slope change of the weight loss curve exceeds a first preset value and a second slope after the slope change exceeds the first preset value; if the ratio of the first slope to the second slope is less than a second preset value, determining that the anti-channeling capability of the target cement slurry does not need to be optimized; if the ratio of the first slope to the second slope is greater than a second preset value, determining that the anti-channeling capability of the target cement slurry needs to be optimized.

[0063] In one embodiment, when the ratio of the first slope to the second slope is greater than a second preset value, determining that the anti-channeling ability of the target cement slurry needs to be optimized includes: determining a cement slurry admixture that changes the anti-channeling ability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; and changing the dosage of the cement slurry admixture to optimize the anti-channeling ability of the target cement slurry.

[0064] In one embodiment, the method further includes: determining that the anti-channeling capability of the target cement slurry needs to be optimized when the number of changes is greater than a preset number.

[0065] In one embodiment, determining the need to optimize the anti-channeling capability of the target cement slurry when the number of changes exceeds a preset number includes: identifying a cement slurry admixture that alters the anti-channeling capability of the cement slurry, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; obtaining a third slope before the first slope change exceeds a first preset value and a fourth slope after the first slope change exceeds the first preset value; if the ratio of the third slope to the fourth slope is less than a second preset value, changing the amount of cement slurry admixture to optimize the anti-channeling capability of the target cement slurry; and if the ratio of the third slope to the fourth slope is greater than the second preset value, changing the type of cement slurry admixture to optimize the anti-channeling capability of the target cement slurry.

[0066] In one embodiment, the method further includes: when multiple weight loss curves are obtained, and the number of times the slope change of each weight loss curve is greater than a first preset value is greater than a preset number, determining the target duration corresponding to the slope of each weight loss curve being within a preset range; for each weight loss curve, determining the anti-channeling ability of the cement slurry corresponding to the weight loss curve based on the target duration of the weight loss curve, wherein the longer the target duration corresponding to the weight loss curve, the worse the anti-channeling ability of the cement slurry corresponding to the weight loss curve.

[0067] In one embodiment, fitting multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment corresponding to the test device includes: determining the weight loss pressure data corresponding to each liquid column pressure data; fitting the weight loss pressure data to determine the weight loss curve; wherein, the weight loss pressure value P corresponding to each weight loss pressure data is determined by formula (1). loss :

[0068] P loss =gρ c L c -P l Formula (1)

[0069] Where g is the acceleration due to gravity; ρ c L represents the density of the cement paste. c P is the length of the cement grout column; l This represents the liquid column pressure value.

[0070] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0071] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0072] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0073] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0074] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0075] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0076] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0077] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0078] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining the anti-channeling capability of cement slurry based on weight loss curves, characterized in that, The method includes: Obtain the actual temperature and pressure downhole of the oil and gas well to be observed; The actual temperature and actual pressure are input into the testing device so that the testing device sets up a simulated testing environment according to the actual temperature and actual pressure; Multiple liquid column pressure data generated by the target cement slurry in the simulated test environment are acquired at a preset frequency, wherein the target cement slurry is a conventional cement slurry with performance meeting preset standards; Fit the multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment; Determine the number of times the slope of the weightlessness curve changes greater than a first preset value; The type of the weight loss curve is determined based on the number of changes, and the anti-channeling capability of the target cement slurry is determined based on the curve type. The determination of the weight loss curve type based on the number of changes, and the determination of the anti-channeling capability of the target cement slurry based on the curve type, include: When the number of changes is a preset number, the curve type of the weightlessness curve is determined to be the first type, and the first slope of the weightlessness curve before the slope change is greater than the first preset value and the second slope after the slope change is greater than the first preset value are obtained. If the ratio of the first slope to the second slope is less than a second preset value, it is determined that there is no need to optimize the anti-channeling capability of the target cement slurry. If the ratio of the first slope to the second slope is greater than the second preset value, it is determined that the anti-channeling capability of the target cement slurry needs to be optimized.

2. The method for determining the anti-channeling capability of cement slurry based on weight loss curves according to claim 1, characterized in that, The step of determining that the anti-channeling capability of the target cement slurry needs to be optimized when the ratio of the first slope to the second slope is greater than the second preset value includes: A cement slurry admixture that alters the anti-channeling ability of cement slurry is identified, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; The dosage of the cement slurry admixture was varied to optimize the anti-channeling ability of the target cement slurry.

3. The method for determining the anti-channeling capability of cement slurry based on weight loss curves according to claim 1, characterized in that, The method further includes: If the number of changes is greater than the preset number, the curve type of the weight loss curve is determined to be the second type, and it is determined that the anti-channeling ability of the target cement slurry needs to be optimized.

4. The method for determining the anti-channeling capability of cement slurry based on weight loss curves according to claim 3, characterized in that, The step of determining that the anti-channeling capability of the target cement slurry needs to be optimized when the number of changes is greater than the preset number includes: A cement slurry admixture that alters the anti-channeling ability of cement slurry is identified, wherein the cement slurry admixture includes at least one of a retarder, a water loss reducer, and an anti-channeling agent; Obtain the third slope before the first slope change exceeds the first preset value and the fourth slope after the first slope change exceeds the first preset value; If the ratio of the third slope to the fourth slope is less than the second preset value, the amount of cement slurry admixture is changed to optimize the anti-channeling ability of the target cement slurry. If the ratio of the third slope to the fourth slope is greater than the second preset value, the type of cement slurry admixture is changed to optimize the anti-channeling ability of the target cement slurry.

5. The method for determining the anti-channeling capability of cement slurry based on weight loss curves according to claim 1 or 3, characterized in that, The method further includes: If multiple weightlessness curves are obtained, and the number of times the slope of each weightlessness curve changes by more than a first preset value is greater than the preset number, then the target duration corresponding to the slope of each weightlessness curve being within a preset range is determined. For each weight loss curve, the anti-channeling capability of the cement slurry corresponding to the weight loss curve is determined according to the target duration of the weight loss curve. The longer the target duration of the weight loss curve, the worse the anti-channeling capability of the cement slurry corresponding to the weight loss curve.

6. The method for determining the anti-channeling capability of cement slurry based on weight loss curves according to claim 1, characterized in that, The fitting of the multiple liquid column pressure data to determine the weight loss curve of the target cement slurry in the simulated test environment corresponding to the test device includes: Determine the weightlessness pressure data corresponding to each liquid column pressure data; Fit the weightlessness pressure data to determine the weightlessness curve; The weightlessness pressure value corresponding to each weightlessness pressure data is determined by formula (1). : Official (1) in, It is the acceleration due to gravity; Density of cement paste; The length of the cement grout column; This represents the liquid column pressure value.

7. A processor, characterized in that, It is configured to perform the method for determining the anti-channeling capability of cement slurry based on the weight loss curve as described in any one of claims 1 to 6.

8. A device for determining the anti-channeling capability of cement slurry based on a weight loss curve, characterized in that, Includes the processor according to claim 7.

9. A machine-readable storage medium storing instructions thereon, characterized in that, When executed by a processor, this instruction causes the processor to be configured to perform the method for determining the anti-channeling capability of cement slurry based on a weight loss curve according to any one of claims 1 to 6.

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