Perforation penetration depth prediction method and device based on rock comprehensive strength

Abstract

The invention discloses a perforation penetration depth prediction method and device based on rock comprehensive strength. The method comprises the following steps: constructing a generation formula of the rock comprehensive strength according to rock properties and rock states; determining a stress influence comprehensive strength coefficient and a porosity influence comprehensive strength coefficient based on sandstone target penetration depth test data; the stress influence comprehensive strength coefficient and the porosity influence comprehensive strength coefficient are substituted into a generation formula of the rock comprehensive strength, and the stratum rock comprehensive strength is calculated according to the rock property and the rock state of each stratum; and the perforation penetration depth is predicted and determined according to the comprehensive strength of the stratum rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target and the index coefficient of the perforator. By using the comprehensive strength of the rock, the convenience of analyzing sandstone target penetration depth test data and predicting the perforation penetration depth can be greatly improved, and meanwhile, the accuracy and credibility of a prediction result of the perforation penetration depth are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of oil and gas field development and production, and in particular to a method and device for predicting perforation penetration depth based on comprehensive rock strength. Background Art

[0002] Perforation is one of the important links when oil and gas wells are put into production. The perforated holes formed are the only communication channels between the formation and the wellbore. Perforation penetration is one of the most important perforation parameters. If the penetration fails to penetrate the formation contamination zone, the oil and gas well production capacity will drop significantly. Therefore, perforation penetration is an important basis for selecting perforators.

[0003] The perforator can be tested on the ground for target shooting to verify its performance. The commonly used tests include concrete ring target test and single shot perforator sandstone target test. However, since the ground target shooting test cannot completely simulate the underground formation conditions, no matter which test is used, the penetration data obtained needs to be converted or corrected to obtain the perforation penetration result.

[0004] There are many factors that affect perforation penetration, such as 1) the properties of the perforator itself, including charge type, charge amount, liner material and structure, shell structure, molding process, etc. 2) operating conditions during operation, including wellbore pressure, temperature, holster gap, blasting height, annulus fluid type, cement ring thickness, etc. 3) formation rock properties, including rock compressive strength, rock type, porosity, pore fluid type, etc. There are also many methods for predicting perforation penetration, and the influencing factors and calculation methods are also different. The perforation penetration results predicted by different methods can differ by 2-3 times, which brings great troubles and uncertainties to the optimization of perforators and the prediction of oil and gas well productivity. Summary of the invention

[0005] In view of the above problems, embodiments of the present invention are proposed to provide a method and device for predicting perforation penetration depth based on comprehensive rock strength, which overcomes the above problems or at least partially solves the above problems.

[0006] According to one aspect of an embodiment of the present invention, a method for predicting perforation penetration depth based on comprehensive rock strength is provided, the method comprising:

[0007] Construct a formula for the comprehensive strength of rock based on rock properties and rock states;

[0008] Based on the sandstone target penetration test data, determine the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient;

[0009] Substitute the comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity into the formula for generating comprehensive strength of rock, and calculate the comprehensive strength of formation rock according to the rock properties and rock states of each formation;

[0010] The perforation penetration depth is determined based on the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

[0011] According to another aspect of an embodiment of the present invention, a perforation penetration depth prediction device based on comprehensive rock strength is provided, comprising:

[0012] Generative module, suitable for constructing the generative formula of rock comprehensive strength according to rock properties and rock states;

[0013] The strength coefficient determination module is suitable for determining the comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity based on the penetration test data of sandstone targets;

[0014] The comprehensive strength module is suitable for substituting the comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity into the generation formula of rock comprehensive strength, and calculating the comprehensive strength of formation rock according to the rock properties and rock states of each formation;

[0015] The prediction module is suitable for predicting and determining the perforation penetration depth according to the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

[0016] According to another aspect of an embodiment of the present invention, there is provided a computing device, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0017] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the above-mentioned perforation penetration depth prediction method based on comprehensive rock strength.

[0018] According to another aspect of an embodiment of the present invention, a computer storage medium is provided, wherein the storage medium stores at least one executable instruction, and the executable instruction enables a processor to perform operations corresponding to the above-mentioned perforation penetration depth prediction method based on comprehensive rock strength.

[0019] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising at least one executable instruction, wherein the executable instruction enables a processor to execute operations corresponding to the above-mentioned perforation penetration depth prediction method based on comprehensive rock strength.

[0020] According to the perforation penetration depth prediction method and device based on comprehensive rock strength provided by the embodiments of the present invention, the use of comprehensive rock strength can greatly improve the convenience of analyzing sandstone target penetration depth test data and predicting perforation penetration depth, while improving the accuracy and credibility of the prediction results of perforation penetration depth.

[0021] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation method of the embodiment of the present invention is specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the embodiments of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 A flow chart of a method for predicting perforation penetration depth based on comprehensive rock strength according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the curve between perforator penetration depth and rock uniaxial compressive strength is shown;

[0025] Figure 3 A schematic diagram of the curve showing the uniaxial compressive strength of rock and the comprehensive strength coefficient affected by stress;

[0026] Figure 4 A schematic diagram of the curve showing rock porosity and the porosity effect on the comprehensive strength coefficient;

[0027] Figure 5 A schematic diagram of the perforator penetration depth and rock comprehensive strength curve is shown;

[0028] Figure 6 A schematic diagram of the structure of a perforation penetration depth prediction device based on comprehensive rock strength according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of the structure of a computing device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0031] Figure 1 FIG. 4 is a flow chart showing a method for predicting perforation penetration depth based on comprehensive rock strength according to an embodiment of the present invention. Figure 1As shown, the method comprises the following steps:

[0032] Step S101, constructing a generative formula for comprehensive rock strength according to rock properties and rock states.

[0033] The existing technology for perforation penetration calculation includes: (1) calculating the penetration depth of the perforator in the Berea sandstone target based on the penetration data of the perforator in the concrete ring target; (2) calculating the penetration depth of the perforator in rocks of different strengths based on the penetration data of the Berea sandstone target; (3) considering the influence of the rock stress state, calculating the formation penetration depth of the perforator. According to the above process, it can be seen that the existing technology is relatively cumbersome when determining the perforation penetration depth, and ignores the mutual relationship between the various influencing factors of the perforation penetration depth. Through the analysis of a large amount of sandstone target penetration test data, the influence of stress on the penetration result depends on the uniaxial compressive strength of the rock. The influence of stress and uniaxial compressive strength on penetration is not independent, resulting in a large error in the penetration prediction results of the existing technology.

[0034] Considering the above problems, this embodiment introduces the comprehensive strength of rock when predicting the perforation penetration depth. The comprehensive strength of rock characterizes the difficulty of perforating the rock. The comprehensive strength of rock includes the comprehensive influence of multiple influencing factors on the perforation penetration depth, including the properties of the rock itself and the state of the rock. The rock properties include the uniaxial compressive strength and porosity of the rock, and the rock state includes rock stress. Among them, the comprehensive strength of rock is proportional to the uniaxial compressive strength and rock stress of the rock, and inversely proportional to the porosity. Furthermore, parameters related to rock properties and rock states are relatively easy to obtain, so the comprehensive strength of rock is also easy to determine, which is convenient for predicting the perforation penetration depth based on the comprehensive strength of rock.

[0035] Through the analysis of sandstone target penetration test data, it can be seen that the influence of rock stress on the comprehensive strength of rock depends on the uniaxial compressive strength of rock. When the uniaxial compressive strength of rock is small, increasing rock stress can significantly improve the comprehensive strength of rock, resulting in a significant decrease in the penetration depth of the formation; when the uniaxial compressive strength of rock is large, increasing rock stress does not significantly reduce the penetration depth of the formation, that is, the increase in the comprehensive strength of rock is small. The generation formula of the constructed comprehensive strength of rock is as follows:

[0036] cs=us+α(us)*p s -β(poro)*us

[0037] Among them, cs is the comprehensive strength of rock; us is the uniaxial compressive strength of rock; α(us) is the comprehensive strength coefficient affected by stress; p s is rock stress; poro is rock porosity; β(poro) is the porosity-influenced comprehensive strength coefficient. The formula for the comprehensive strength of rock can be applied to various rocks such as formation rock and sandstone target.

[0038] Step S102, based on the sandstone target penetration test data, determining the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient.

[0039] The formula for generating comprehensive rock strength includes the comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity. The comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity need to be determined based on penetration test data.

[0040] Specifically, a sandstone target is used for penetration testing. First, based on the unconstrained state, that is, when the rock stress is 0, a penetration test of the sandstone target is performed, and a relationship curve between the test penetration depth of the perforator and the uniaxial compressive strength of the rock can be obtained, such as Figure 2 As shown, the horizontal axis, i.e., the x-axis, is the uniaxial compressive strength of the rock, the vertical axis, i.e., the y-axis, is the penetration depth, and the blue dots are the penetration depth test data, generating a relationship curve, y=0.84175e -0.01091x Considering that the influence of porosity on penetration depth is relatively small, and the sandstone targets with a small porosity variation range are selected for penetration depth test, the influence of porosity is temporarily ignored when determining the stress-affected comprehensive strength coefficient. The comprehensive strength of the unconstrained sandstone target is equal to the uniaxial compressive strength of the sandstone target itself. Therefore, according to Figure 2 The relationship curve shown can determine the relationship between the penetration depth of the perforator and the comprehensive strength of the rock.

[0041] Then, the penetration test is performed after stress is applied to the sandstone target. The same perforator is used for the test. If the penetration depth of the sandstone target is consistent when using the same perforator, the comprehensive strength of the sandstone target should also be consistent. Figure 2 The relationship curve between the penetration depth of the perforator and the comprehensive strength of the rock can be determined to determine the comprehensive strength of the sandstone target. The stress-affected comprehensive strength coefficient can be calculated based on the comprehensive strength of the sandstone target and the generation formula of the comprehensive strength of the rock. After applying stress, according to the penetration test, the following is obtained: Figure 3 The relationship curve between the uniaxial compressive strength of rock and the comprehensive strength coefficient affected by stress is shown. The horizontal axis, i.e., the x-axis, is the uniaxial compressive strength of rock, and the vertical axis, i.e., the y-axis, is the comprehensive strength coefficient affected by stress. The blue dots are the penetration test data, and the linear relationship is obtained, y = -0.00262x + 0.73977. At this time, ignoring the influence of porosity, the simplified formula for the comprehensive strength of rock is cs = us + α (us) * p s , combined with the determined comprehensive strength of the sandstone target, the applied rock stress, and the uniaxial compressive strength of the rock, the stress-affected comprehensive strength coefficient can be obtained, α(us)=0.73977-0.00262*us.

[0042] The influence of porosity on the comprehensive strength of rock is relatively small. Figure 2 and Figure 3According to the comprehensive strength of the sandstone target, the stress-affected comprehensive strength coefficient, and the formula for the comprehensive strength of the rock, cs = us + α (us) * p s -β(poro)*us, after substituting the comprehensive strength of sandstone target, stress-affected comprehensive strength coefficient, rock stress, porosity, etc., the porosity-affected comprehensive strength coefficient can be determined. The relationship between porosity-affected comprehensive strength coefficient and porosity is as follows: Figure 4 As shown, the horizontal axis, i.e., the x-axis, is the porosity of the rock, the vertical axis, i.e., the y-axis, is the comprehensive strength coefficient affected by the porosity, and the blue dots are the penetration test data. A linear relationship is obtained, y=0.00263*x-0.02819, thereby obtaining the comprehensive strength coefficient affected by the porosity, β(poro)=0.00263*poro-0.02819.

[0043] Step S103, substitute the comprehensive strength coefficient of stress influence and the comprehensive strength coefficient of porosity influence into the generation formula of rock comprehensive strength, and calculate the comprehensive strength of the formation rock according to the rock properties and rock state of each formation.

[0044] The formation rock in the formation can adopt the formula for generating the comprehensive strength of rock. Substituting the above-obtained comprehensive strength coefficient of stress influence and the comprehensive strength coefficient of porosity influence into the formula for generating the comprehensive strength of rock, the following is obtained:

[0045] cs=us+[0.73977-0.00262us]*p s -[0.00263poro-0.02819]*us

[0046] The comprehensive strength of the formation rock can be calculated by substituting the obtained uniaxial compressive strength and porosity of the formation rock itself and the rock stress currently applied to the formation rock into the above-mentioned generating formula.

[0047] Step S104, predicting and determining the perforation penetration depth according to the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

[0048] The comprehensive strength coefficients affected by stress and porosity can be determined through penetration test data, and the comprehensive strength of the formation rock can be determined by obtaining the property parameters of the formation rock itself, such as the uniaxial compressive strength and porosity of the rock, and obtaining the rock stress exerted by the formation rock.

[0049] According to the comprehensive strength of the formation rock, it is relatively convenient to analyze the test data of the sandstone target of the perforator and predict the perforation penetration depth. By conducting more than three groups of sandstone target penetration tests on a certain perforator, the relationship curve between the test penetration depth of the sandstone target of the perforator and the comprehensive strength of the sandstone target can be fitted, such as Figure 5As shown in the figure, the curve reflects the rock perforation capability of this perforator. The horizontal axis, i.e., the x-axis, is the comprehensive strength of the sandstone target, and the vertical axis, i.e., the y-axis, is the perforation depth. The blue dots are four sets of penetration test data, and the relationship curve is generated. y=1.17067e -0.01255x .

[0050] The perforation penetration depth can be calculated based on the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator, as shown below:

[0051]

[0052] Where, lp is the perforation penetration depth; lp test The test penetration of sandstone target; cs test is the comprehensive strength of sandstone target; cs is the comprehensive strength of formation rock; χ is the exponential coefficient of perforator. The perforation penetration depth is exponentially related to the comprehensive strength of formation rock; when the comprehensive strength of formation rock increases, the perforation penetration depth decreases exponentially.

[0053] χ is the rate at which the penetration capability of the perforator decreases with the increase of the comprehensive strength of the rock. The larger the χ is, the faster the penetration capability of the perforator decreases with the increase of the comprehensive strength of the rock. χ is determined according to the properties and / or structure of the perforator, and is related to the properties of the perforator itself, such as the charge amount, the material and structure of the liner, etc. During implementation, a certain perforator can be subjected to several groups of penetration tests, such as more than 3 groups of sandstone targets, and the χ value of the perforator can be determined according to the properties and / or structure of the perforator and the penetration test data of the sandstone targets, which is not limited here.

[0054] This embodiment uses the easily accessible properties of the rock itself, the applied rock stress, etc. to construct a generative formula for the comprehensive strength of the rock, which can conveniently determine the comprehensive strength of the formation rock. The comprehensive strength of the formation rock combined with the test penetration data of the perforator on the sandstone target can conveniently predict the perforation penetration depth under any formation conditions, which is simpler and more convenient, and has higher accuracy and reliability.

[0055] According to the perforation penetration depth prediction method based on comprehensive rock strength provided by an embodiment of the present invention, the use of the comprehensive strength of formation rock can greatly improve the convenience of analyzing sandstone target penetration depth test data and predicting perforation penetration depth, while improving the accuracy and credibility of the prediction results of perforation penetration depth.

[0056] Figure 6 FIG. 2 shows a schematic diagram of the structure of a perforation penetration depth prediction device based on rock comprehensive strength provided by an embodiment of the present invention. Figure 6 As shown, the device comprises:

[0057] A generating formula module 610, adapted to construct a generating formula of rock comprehensive strength according to rock properties and rock states;

[0058] The strength coefficient determination module 620 is adapted to determine the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient based on the sandstone target penetration test data;

[0059] The comprehensive strength module 630 is adapted to substitute the comprehensive strength coefficient of stress influence and the comprehensive strength coefficient of porosity influence into the generation formula of rock comprehensive strength, and calculate the comprehensive strength of the formation rock according to the rock properties and rock states of each formation;

[0060] The prediction module 640 is adapted to predict and determine the perforation penetration depth according to the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

[0061] Optionally, the rock properties include rock uniaxial compressive strength and porosity; the rock state includes rock stress; the comprehensive strength of the rock is proportional to the rock uniaxial compressive strength and rock stress; and inversely proportional to the porosity.

[0062] Optionally, the intensity coefficient determination module 620 is further adapted to:

[0063] Based on the unconstrained state, the penetration depth of the sandstone target is tested, and the relationship curve between the test penetration depth of the perforator and the uniaxial compressive strength of the rock is obtained, wherein the comprehensive strength of the sandstone target in the unconstrained state is the uniaxial compressive strength of the rock;

[0064] After stress is applied to the sandstone target, a penetration test is carried out, and the stress-affected comprehensive strength coefficient is determined in combination with the formula for generating the comprehensive strength of the rock.

[0065] Optionally, the intensity coefficient determination module 620 is further adapted to:

[0066] According to the comprehensive strength of the sandstone target and the obtained stress-affected comprehensive strength coefficient, combined with the generation formula of the comprehensive strength of rock, the porosity-affected comprehensive strength coefficient is determined.

[0067] Optionally, the perforation penetration depth is exponentially related to the comprehensive strength of the formation rock; when the comprehensive strength of the formation rock increases, the perforation penetration depth decreases exponentially.

[0068] Optionally, the exponential coefficient of the perforator is determined according to the properties and / or structure of the perforator and several groups of penetration test data of sandstone targets.

[0069] The description of each module above refers to the corresponding description in the method embodiment and will not be repeated here.

[0070] An embodiment of the present invention further provides a non-volatile computer storage medium, which stores at least one executable instruction, and the executable instruction can execute operations corresponding to the perforation penetration depth prediction method based on comprehensive rock strength in any of the above method embodiments.

[0071] An embodiment of the present application provides a computer program product, which includes at least one executable instruction or computer program, which enables a processor to perform operations corresponding to the perforation penetration depth prediction method based on comprehensive rock strength in any of the above-mentioned method embodiments.

[0072] Figure 7 A schematic diagram of the structure of a computing device according to an embodiment of the present invention is shown, and the specific implementation of the embodiment of the present invention does not limit the specific implementation of the computing device.

[0073] like Figure 7 As shown, the computing device may include: a processor 702 , a communication interface 704 , a memory 706 , and a communication bus 708 .

[0074] in:

[0075] The processor 702 , the communication interface 704 , and the memory 706 communicate with each other via a communication bus 708 .

[0076] The communication interface 704 is used to communicate with other devices such as clients or other servers.

[0077] The processor 702 is used to execute the program 710, and specifically can execute the relevant steps in the above-mentioned embodiment of the perforation penetration depth prediction method based on the comprehensive strength of rock.

[0078] Specifically, the program 710 may include program codes, which include computer operation instructions.

[0079] The processor 702 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the computing device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0080] The memory 706 is used to store the program 710. The memory 706 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0081] Program 710 can be specifically used to enable processor 702 to execute the perforation penetration depth prediction method based on rock comprehensive strength in any of the above-mentioned method embodiments. The specific implementation of each step in program 710 can refer to the corresponding descriptions in the corresponding steps and units in the above-mentioned perforation penetration depth prediction embodiment based on rock comprehensive strength, which will not be repeated here. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-mentioned devices and modules can refer to the corresponding process description in the above-mentioned method embodiment, which will not be repeated here.

[0082] The algorithm or display provided herein is not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the embodiment of the present invention is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the embodiment of the present invention described herein, and the description of the above specific language is to disclose the preferred implementation of the embodiment of the present invention.

[0083] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0084] Similarly, it should be understood that in order to streamline the embodiments of the present invention and to aid in understanding one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the following intention: that the claimed embodiments of the present invention require more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, the inventive aspects lie in less than all the features of the single embodiment disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention.

[0085] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0086] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0087] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components according to the embodiments of the present invention. The embodiments of the present invention may also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing an embodiment of the present invention may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0088] It should be noted that the above embodiments illustrate rather than limit the present invention, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim listing a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be understood as limitations on the order of execution.

Claims

1. A method for predicting perforation penetration depth based on comprehensive rock strength, characterized in that: include: Construct a formula for the comprehensive strength of rock based on rock properties and rock states; Based on the sandstone target penetration test data, determine the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient; Substituting the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient into the generating formula of the rock comprehensive strength, the comprehensive strength of the formation rock is calculated according to the rock properties and rock states of each formation; The perforation penetration depth is determined by predicting the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

2. The method according to claim 1, characterized in that The rock properties include the uniaxial compressive strength and porosity of the rock; the rock state includes rock stress; the comprehensive strength of the rock is proportional to the uniaxial compressive strength and rock stress of the rock; and inversely proportional to the porosity.

3. The method according to claim 1, characterized in that The method of determining the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient based on the sandstone target penetration test data further includes: The penetration depth test of the sandstone target is carried out based on the unconstrained state, and the relationship curve between the test penetration depth of the perforator and the uniaxial compressive strength of the rock is obtained; wherein, the comprehensive strength of the sandstone target in the unconstrained state is the uniaxial compressive strength of the rock; After stress is applied to the sandstone target, a penetration test is performed, and the stress-affected comprehensive strength coefficient is determined in combination with the generation formula of the rock comprehensive strength.

4. The method according to claim 3, characterized in that The determination of the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient based on the sandstone target penetration test data further includes: According to the comprehensive strength of the sandstone target and the obtained stress-affected comprehensive strength coefficient, combined with the generating formula of the rock comprehensive strength, the porosity-affected comprehensive strength coefficient is determined.

5. The method according to claim 1, characterized in that The perforation penetration depth is exponentially related to the comprehensive strength of the formation rock; when the comprehensive strength of the formation rock increases, the perforation penetration depth decreases exponentially.

6. The method according to claim 5, characterized in that The exponential coefficient of the perforator is determined according to the properties and / or structure of the perforator and several groups of penetration test data of sandstone targets.

7. A perforation penetration prediction device based on comprehensive rock strength, characterized in that: The device includes: Generative module, suitable for constructing the generative formula of rock comprehensive strength according to rock properties and rock states; The strength coefficient determination module is suitable for determining the comprehensive strength coefficient affected by stress and the comprehensive strength coefficient affected by porosity based on the penetration test data of sandstone targets; A comprehensive strength module, adapted to substitute the stress-affected comprehensive strength coefficient and the porosity-affected comprehensive strength coefficient into the generating formula of the comprehensive strength of the rock, and calculate the comprehensive strength of the formation rock according to the rock properties and rock states of each formation; The prediction module is suitable for predicting and determining the perforation penetration depth according to the comprehensive strength of the formation rock, the comprehensive strength of the sandstone target, the test penetration depth of the sandstone target, and the exponential coefficient of the perforator.

8. A computing device, characterized in that include: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to the perforation penetration depth prediction method based on comprehensive rock strength as described in any one of claims 1-6.

9. A computer storage medium, characterized in that The storage medium stores at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the perforation penetration depth prediction method based on comprehensive rock strength as described in any one of claims 1-6.

10. A computer program product, characterized in that It includes at least one executable instruction, which enables the processor to execute operations corresponding to the perforation penetration depth prediction method based on comprehensive rock strength as described in any one of claims 1-6.

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