Method, device and equipment for quantitatively judging salt rock stratum during well drilling and storage medium

Abstract

The invention discloses a method, a device, equipment and a storage medium for quantitatively judging a salt rock stratum during well drilling, and the method comprises the following steps: calculating the product of the drilling fluid conductivity, the drilling fluid density and the logarithm of a bit pressure numerical value, and dividing the product result by the product of a drilling time numerical value and a turntable torque numerical value to obtain a lithology identification factor Q; and lithology judgment is carried out according to the calculated lithology identification factor Q. According to the method, on the basis of salt rock characteristics under the water-based drilling fluid, lithological sensitive parameters are optimized to construct empirical formulas: drilling pressure, drilling time, drilling fluid conductivity, drilling fluid density and turntable torque. According to the method, reference can be provided for measure formulation in the drilling process in time, the drilling jamming occurrence probability is reduced, and meanwhile the defect that the current qualitative recognition accuracy depends on the operation experience of operators to a great extent is overcome.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas exploration and development, and particularly relates to a method, device, equipment and storage medium for quantitatively identifying salt rock layers in drilling. BACKGROUND

[0002] Accurate identification of salt rock layers is of great significance for safe drilling, and the unique creep characteristics of salt rock layers can easily lead to hole shrinkage. If salt rock layers are drilled and no targeted measures are taken in the drilling process (such as increasing the frequency of well wall drawing and scratching, and increasing the density of drilling fluid), it may cause sticking and greatly affect the drilling efficiency. In oil-based drilling fluid, salt rock cuttings can be returned to the surface with the drilling fluid circulation, and the lithology can be directly identified according to the cuttings, but in water-based drilling fluid, due to the characteristics of salt rock being easily dissolved in water, representative cuttings cannot be obtained, which leads to difficulties in accurately identifying salt rock layers during drilling. At present, there are mainly two ways to identify salt rock under the condition of water-based drilling fluid. One is to identify salt rock layers by implementing logging after drilling, which has high accuracy, but cannot provide reference for the drilling process in time. The other is to qualitatively identify by the change of related parameters (such as drilling time and cuttings return amount) in the drilling process, but the identification accuracy depends largely on the operation experience of the operator, and has great uncertainty.

[0003] The patent application with the patent publication number CN113187470A and the name of a method and device for identifying shale oil layers and conventional oil layers on a well profile, the method comprises: preprocessing the gas logging data and logging data of the target well, and reprocessing the gas logging data and logging data after preprocessing, so that the gas logging data and logging data are simultaneously obtained on each depth data point; obtaining the organic matter abundance data of the target well; obtaining the saturated pyrolysis free hydrocarbon parameter of the target well; obtaining the relationship between the total oil content of the target well downhole sample and the saturated pyrolysis free hydrocarbon parameter of the target well according to the gas logging data; identifying shale oil layers and conventional oil layers according to the relationship between the total oil content of the target well downhole sample and the saturated pyrolysis free hydrocarbon parameter of the target well. Although the patent application can identify oil layers, it cannot accurately identify salt rock layers. SUMMARY

[0004] In order to overcome the problems existing in the prior art, the purpose of the present application is to provide a method, device, equipment and storage medium for quantitatively identifying salt rock layers in drilling, which is obtained by formulating a formula based on experience summary, and has a unified operation standard for quantitatively identifying salt rock layers in the drilling process of water-based drilling fluid, and has practical significance.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

[0006] A method for quantitatively identifying salt rock layers in drilling, comprising the following steps:

[0007] S1: calculating the product of the logarithm of the drilling fluid conductivity, the drilling fluid density and the weight on bit, and dividing the product by the product of the rate of penetration and the rotary table torque to obtain a lithology identification factor Q;

[0008] S2: judging the lithology according to the calculated lithology identification factor Q.

[0009] Optionally, in step S1, the drilling fluid conductivity value is three times the measured value.

[0010] Optionally, the formula in step S1 is:

[0011]

[0012] wherein Q is the lithology identification factor, dimensionless; δ is the drilling fluid conductivity value, dimensionless; ρ is the drilling fluid density value, dimensionless; WOB is the weight on bit value, dimensionless; ROP is the rate of penetration value, dimensionless; and TQP is the rotary table torque value, dimensionless.

[0013] Optionally, before step S1, collecting data of the drilling fluid conductivity, the drilling fluid density, the weight on bit, the rate of penetration and the rotary table torque.

[0014] Optionally, in step S1, the drilling fluid conductivity, the drilling fluid density, the weight on bit, the rate of penetration and the rotary table torque all use the average of the collected data.

[0015] Optionally, in step S2, when the lithology identification factor Q is greater than or equal to 0.25, it is judged as salt rock.

[0016] Optionally, when the lithology identification factor Q is greater than or equal to 0.1 and less than 0.25, it is judged as mudstone, and when the lithology identification factor Q is less than 0.1, it is judged as gypsum.

[0017] A device for quantitatively identifying salt rock layers in drilling, comprising:

[0018] a calculation module for calculating the product of the logarithm of the drilling fluid conductivity, the drilling fluid density and the weight on bit, and dividing the product by the product of the rate of penetration and the rotary table torque to obtain a lithology identification factor Q;

[0019] a judgment module for judging the lithology according to the calculated lithology identification factor Q.

[0020] An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for quantitatively identifying salt rock layers in drilling when executing the computer program.

[0021] A computer readable storage medium stores a computer program, the computer program is executed by a processor to implement the steps of the method for quantitatively identifying salt rock layers in drilling.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The purpose of the present application is to provide a method for quantitatively identifying salt rock layers in the process of drilling with water-based drilling fluid. The present application is based on the characteristics of salt rock under water-based drilling fluid, and an empirical formula is constructed by optimizing lithological sensitive parameters: drilling pressure, drilling time, drilling fluid conductivity, drilling fluid density and rotary table torque. Due to the characteristics of salt rock that is easy to dissolve in water-based mud, it will cause the drilling pressure to decrease and the drilling time to speed up; after the salt rock dissolves in the drilling fluid, it will cause the ion content of the drilling fluid to increase, resulting in an increase in the conductivity and density of the drilling fluid; due to the dissolution of salt rock, the amount of annular returning cuttings is significantly reduced, the rotating resistance of the drilling tool is reduced, and the torque is reduced. The present application can provide a reference for the development of drilling process measures in a timely manner, reduce the probability of drilling pipe sticking, and at the same time solve the defect that the accuracy of qualitative identification is largely dependent on the operation experience of the operator. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

[0025] In the drawings:

[0026] Figure 1 A logic flow chart for the construction of the method for quantitatively identifying salt rock layers in drilling of the present application;

[0027] Figure 2 A comparison chart of the identification results of the embodiments of the present application. DETAILED DESCRIPTION

[0028] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] It is to be noticed that the mere fact that some reference signs are placed between parentheses in a claim, should not be understood as to limit their scope. The word "comprising" does not exclude other elements than the ones listed after this word. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. It is noted that the application can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the description, a single unit can carry out several functions thanks to the fact that several components are integrated in a same item. The use of "first", "second" and "third" etc. does not indicate any order. These designations are to be interpreted as names.

[0031] Furthermore, the terms "first", "second", etc. are used herein only to describe different categories of items and do not imply a limitation on the number of such items. The use of the terms "a", "an", and "the" to describe the various items herein are used generically, and not in a limiting sense. The use of the term "at least" followed by a list of one or more items suggests that at least one of the items of the list is present. The use of the term "one" of an item or "one" of at least one of the items suggests that one or more of the items are present and can be a single item or a plurality of the items. The use of the term "at most" followed by a list of one or more items suggests that there are one or more of the items of the list, and not more than the maximum number of the items.

[0032] The application will be described in greater detail with reference to the accompanying drawings.

[0033] As shown in the drawings, Figure 1 Based on the characteristics of salt rock under water-based drilling fluid, the lithology sensitive parameters are preferably selected, specifically, the drilling pressure, drilling time, drilling fluid conductivity, drilling fluid density and rotary table torque, which are all parameters that can be measured during drilling.

[0034] Due to the characteristics of salt rock that is easy to dissolve in water-based mud, the drilling pressure decreases and the drilling time accelerates. After the salt rock dissolves in the drilling fluid, the ion content of the drilling fluid increases, causing the drilling fluid conductivity and density to increase. The amount of annular upward cuttings significantly decreases due to the dissolution of salt rock, and the rotating resistance of the drilling tool decreases, causing the torque to decrease.

[0035] The method for quantitatively identifying salt rock layers in drilling according to the application comprises the following steps:

[0036] S1: Calculate the product of the logarithms of the drilling fluid conductivity, the drilling fluid density and the drilling pressure values, and divide the product by the product of the drilling time value and the rotary table torque value to obtain a lithology identification factor Q;

[0037] S2: Determine the lithology according to the calculated lithology identification factor Q.

[0038] Optionally, in step S1, the drilling fluid conductivity value is three times the measured value.

[0039] Specifically, the formula in step S1 is:

[0040]

[0041] Wherein, Q is a lithology identification factor, dimensionless; delta is a drilling fluid conductivity value, dimensionless; rho is a drilling fluid density value, dimensionless; WOB is a drilling pressure value, dimensionless; ROP is a drilling time value, dimensionless; TQP is a rotary table torque value, dimensionless.

[0042] Specifically, the drilling fluid conductivity, drilling fluid density, drilling pressure, drilling time and rotary table torque in the formula all adopt the average value of the collected data.

[0043] Specifically, the judgment method is shown in the following table 1. Using the Q determination standard, the actual data application is carried out to identify the salt rock layer.

[0044] Table 1

[0045] Serial number Lithology Q value 1 Salt rock Q≥0.25 2 Mudstone 0.1≤Q＜0.25 3 Gypsum Q<0.1

[0046] When the lithology identification factor Q is greater than or equal to 0.25, it is judged as salt rock. When the lithology identification factor Q is greater than or equal to 0.1 and less than 0.25, it is judged as mudstone. When the lithology identification factor Q is less than 0.1, it is judged as gypsum.

[0047] The present application is based on the characteristics of salt rock under water-based drilling fluid, and the experience formula of the preferred lithology sensitive parameters is constructed: drilling pressure, drilling time, drilling fluid conductivity, drilling fluid density and rotary table torque.

[0048] Due to the characteristics of salt rock that is easy to dissolve in water-based mud, it will cause the drilling pressure to decrease and the drilling time to accelerate; after the salt rock dissolves in the drilling fluid, it will cause the ion content of the drilling fluid to increase, causing the drilling fluid conductivity and density to increase; due to the dissolution of salt rock, the annular return of cuttings is significantly reduced, the rotating resistance of the drilling tool is reduced, and the torque is reduced.

[0049] The present application can provide reference for timely drilling process measures, reduce the probability of drilling sticking, and at the same time solve the defect that the current qualitative identification accuracy largely depends on the operation experience of the operator.

[0050] The device for quantitatively identifying salt rock layer of the present application comprises:

[0051] The calculation module is used for calculating the product of the logarithm of the drilling fluid conductivity, the drilling fluid density and the drilling pressure value, and dividing the product result by the product of the drilling time value and the rotary table torque value to obtain the lithology identification factor Q.

[0052] The judgment module is used for judging the lithology according to the calculated lithology identification factor Q.

[0053] An electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for quantitatively identifying salt rock layers in drilling.

[0054] A computer readable storage medium stores a computer program, wherein the computer program is executable by a processor to implement the steps of the method for quantitatively identifying salt rock layers in drilling.

[0055] Embodiments

[0056] In this embodiment, oil well A is taken as an example, the well is a water-based drilling fluid system, and a salt rock layer is drilled at 4700-4820m, the corresponding sensitive parameters of the 4701-4820m section are processed by using the achievements of the application, and the salt rock layer is quantitatively identified:

[0057] The sensitive parameters of the salt rock layer are collected, specifically including drilling pressure, drilling time, drilling fluid conductivity, drilling fluid density, and rotary table torque;

[0058] The lithology identification factor Q corresponding to the well depth is calculated;

[0059] The 4700-4820m lithology is classified according to the classification and judgment standard of the lithology identification factor Q;

[0060] The classification result is compared with the lithology classified by the logging data to evaluate the accuracy.

[0061] From the above, Figure 2 It can be known that the lithology identification factor Q calculated by the method of the application can realize the identification of the salt rock layer in the water-based mud drilling process, and the error with the identification result of the logging data is small, and the identification accuracy is high.

[0062] The above only describes the preferred embodiments of the application and should not be used to limit the application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

[0063] Those skilled in the art of the technical field should understand that the embodiments of the application can be provided as a method, a system, or a computer program product. Therefore, the application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0064] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 The flowchart and / or block diagram in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to the present application. In this regard, each flowchart block and / or combination of flowchart blocks 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, 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 means for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks.

[0065] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 The flowchart and / or block diagram in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to the present application. In this regard, each flowchart block and / or combination of flowchart blocks 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, 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 means for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks.

[0066] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 The flowchart and / or block diagram in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to the present application. In this regard, each flowchart block and / or combination of flowchart blocks 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, 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 means for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks.

[0067] In the above embodiments, the working modes or control modes involved are the conventional working modes or control modes in the field unless otherwise specified.

[0068] Although the preferred embodiments of the present application have been described, those skilled in the art will be able to make additional modifications and variations to these embodiments without departing from the spirit and scope of the application. Accordingly, the appended claims are intended to encompass all such modifications and variations as falling within the scope of the application.

[0069] Finally, it should be noted that the above-mentioned embodiments are merely used to explain the technical solutions of the present application, not to limit the present application. Other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered within the scope of claims of the present application.

Claims

1. A method for quantitatively identifying salt rock layers in a well, characterized by, The method comprises the following steps: S1: calculating the product of the logarithm of the drilling fluid conductivity, the drilling fluid density and the drilling pressure value, and dividing the product by the product of the drilling time value and the rotary table torque value to obtain a lithology identification factor Q; S2: judging the lithology according to the calculated lithology identification factor Q.

2. The method of claim 1, wherein, In step S1, the drilling fluid conductivity value is three times the measured value.

3. The method of claim 1, wherein, The formula in step S1 is: Wherein, Q is the lithology identification factor, dimensionless; δ is the drilling fluid conductivity value, dimensionless; ρ is the drilling fluid density value, dimensionless; WOB is the drilling pressure value, dimensionless; ROP is the drilling time value, dimensionless; TQP is the rotary table torque value, dimensionless.

4. The method of claim 1, wherein, Before step S1, collect the data of the drilling fluid conductivity, the drilling fluid density, the drilling pressure, the drilling time and the rotary table torque.

5. The method of claim 2, wherein, In step S1, the drilling fluid conductivity, the drilling fluid density, the drilling pressure, the drilling time and the rotary table torque all use the average value of the collected data.

6. The method of claim 1, wherein, In step S2, when the lithology identification factor Q is greater than or equal to 0.25, it is judged as salt rock.

7. The method of claim 4, wherein, When the lithology identification factor Q is greater than or equal to 0.1 and less than 0.25, it is judged as mudstone, and when the lithology identification factor Q is less than 0.1, it is judged as gypsum.

8. A device for quantitatively identifying salt rock layers in a well, characterized by The method comprises: A calculation module for calculating the product of the logarithm of the drilling fluid conductivity, the drilling fluid density and the drilling pressure value, and dividing the product by the product of the drilling time value and the rotary table torque value to obtain a lithology identification factor Q; A judgment module for judging the lithology according to the calculated lithology identification factor Q.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for quantitatively identifying salt rock layers in drilling according to any one of claims 1-7.

10. A computer readable storage medium storing a computer program, wherein the computer program is executable on a processor to implement the steps of the method for quantitatively identifying salt rock layers in drilling according to any one of claims 1-7.

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