Drilling direction control method and device

Abstract

The present application provides a method and device for controlling the direction of drilling, the method comprising: in the process of drilling from the first formation of a target well into the second formation by the drilling rig, obtaining the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig into the second formation, determining the target angle according to the content, the well diameter of the target well and the footage, determining the formation apparent dip angle according to the well inclination angle of the target well and the target angle, and controlling the drilling direction of the drilling rig according to the formation apparent dip angle. The present application can obtain the formation apparent dip angle more quickly and accurately, and thus can more accurately control the drilling direction in real time.

Description

Technical Field

[0001] The present application relates to the technical field of oilfield development, and in particular to a method and device for regulating the drilling direction. Background Art

[0002] Dip logging is a method of measuring the dip and inclination of formations in a borehole. The information from dip logging can be used to study geological structures and sedimentary environments, thereby tracking the distribution of underground oil and gas, and plays an important role in guiding the exploration and development of oil and gas fields.

[0003] At present, a formation dip logging instrument is lowered into a well via a cable to measure the formation dip. However, it is difficult for the probe of the formation dip logging instrument to enter a horizontal well section or a high-angle well section. The obtained formation dip is not accurate enough, and the obtained formation apparent dip is not accurate enough, resulting in the inability to accurately control the drilling direction. Summary of the invention

[0004] The present application provides a method and device for regulating the drilling direction to solve the problem that the formation dip angle obtained by the formation dip logging instrument for a horizontal well section or a high-angle well section is not accurate enough, and the formation apparent dip angle obtained is not accurate enough, resulting in the inability to accurately regulate the drilling direction.

[0005] In a first aspect, the present application provides a method for controlling a drilling direction, comprising:

[0006] In the process of drilling from the first formation into the second formation of the target well by the drilling rig, obtaining the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig into the second formation;

[0007] Determine the target angle according to the content, the diameter of the target well and the footage. The target angle is used to characterize the angle between the interface of the first formation and the second formation and the drilling direction along the drilling direction.

[0008] Determine the formation apparent dip angle according to the well inclination angle of the target well and the target included angle;

[0009] According to the apparent inclination of the formation, the drilling direction of the drilling rig is adjusted.

[0010] Optionally, the target angle is determined based on the content, the diameter of the target well and the footage, including: determining the target height based on the content and the diameter of the target well, the target height is used to characterize the fan height corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determining the target angle based on the target height and the footage.

[0011] Optionally, the target height is determined based on the content and the diameter of the target well, including: determining the bow angle corresponding to the second formation according to the following formula 1, the bow angle is used to characterize the bow angle corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determining the target height based on the bow angle and the diameter of the target well.

[0012] x%=sin(a) / (2π)-a / 360+1 Formula 1

[0013] Wherein, x% represents the content, and a represents the arc angle corresponding to the second stratum.

[0014] Optionally, determining the target height according to the arc angle and the diameter of the target well includes: determining the target height according to the following formula 2:

[0015]

[0016] Wherein, d represents the target height, and D represents the diameter of the target well.

[0017] Optionally, determining the target angle according to the target height and the footage includes: determining the target angle according to the following formula 3:

[0018] ∠β=atan(d / h) Formula 3

[0019] Among them, ∠β represents the target angle, and h represents the footage.

[0020] Optionally, the formation apparent dip angle is determined according to the well inclination angle of the target well and the target included angle, including: if the well inclination angle is less than 90 degrees, the formation apparent dip angle is determined according to the following formula 4:

[0021] ∠δ=90°-∠α-∠β Formula 4

[0022] Among them, ∠δ represents the apparent dip angle of the formation, and ∠α represents the well inclination angle;

[0023] Alternatively, if the well inclination is greater than 90 degrees, the formation apparent dip angle is determined according to the following formula 5:

[0024] ∠δ=∠α-∠β-90° Formula 5.

[0025] In a second aspect, the present application provides a device for controlling a drilling direction, comprising:

[0026] An acquisition module, used for acquiring the content of rock cuttings of the first formation drilled by the drilling rig and the footage of the drilling rig into the second formation during the process of the drilling rig drilling from the first formation into the second formation of the target well;

[0027] A determination module, used to determine a target angle according to the content, the diameter of the target well and the footage, wherein the target angle is used to characterize the angle between the interface between the first formation and the second formation and the drilling direction along the drilling direction;

[0028] A processing module, used for determining the formation apparent dip angle according to the well inclination angle of the target well and the target included angle;

[0029] The control module is used to control the drilling direction of the drilling rig according to the apparent inclination of the formation.

[0030] Optionally, the determination module is specifically used to: determine a target height based on the content and the wellbore diameter of the target well, the target height being used to characterize the fan height corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determine a target angle based on the target height and the footage.

[0031] Optionally, the determination module is specifically used to: determine the bow angle corresponding to the second formation according to the following formula 1, the bow angle is used to characterize the bow angle corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determine the target height according to the bow angle and the well diameter of the target well.

[0032] x%=sin(a) / (2π)-a / 360+1 Formula 1

[0033] Wherein, x% represents the content, and a represents the arc angle corresponding to the second stratum.

[0034] Optionally, the determination module is specifically used to determine the target height according to the following formula 2:

[0035]

[0036] Wherein, d represents the target height, and D represents the diameter of the target well.

[0037] Optionally, the determination module is specifically used to determine the target angle according to the following formula 3:

[0038] ∠β=atan(d / h) Formula 3

[0039] Among them, ∠β represents the target angle, and h represents the footage.

[0040] Optionally, the processing module is specifically used to: if the well inclination angle is less than 90 degrees, determine the formation apparent dip angle according to the following formula 4:

[0041] ∠δ=90°-∠α-∠β Formula 4

[0042] Among them, ∠δ represents the apparent dip angle of the formation, and ∠α represents the well inclination angle;

[0043] Alternatively, if the well inclination is greater than 90 degrees, the formation apparent dip angle is determined according to the following formula 5:

[0044] ∠δ=∠α-∠β-90° Formula 5.

[0045] In a third aspect, the present application provides an electronic device, including: a memory and a processor;

[0046] The memory is used to store program instructions;

[0047] The processor is used to call the program instructions in the memory to execute the method for controlling the drilling direction as described in the first aspect of the present application.

[0048] In a fourth aspect, the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed, the method for controlling the drilling direction as described in the first aspect of the present application is implemented.

[0049] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method for controlling the drilling direction as described in the first aspect of the present application.

[0050] The method and device for controlling the drilling direction provided in the present application obtain the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig drilling into the second formation during the process of the drilling rig drilling from the first formation of the target well into the second formation, determine the target angle according to the content, the wellbore diameter of the target well and the footage, determine the formation apparent dip angle according to the well inclination angle of the target well and the target angle, and control the drilling direction of the drilling rig according to the formation apparent dip angle. Since the present application obtains the formation apparent dip angle based on the content of the first formation rock cuttings drilled by the drilling rig during the process of the drilling rig drilling from the first formation of the target well into the second formation, there is no need to lower the formation dip logging instrument into the well through a cable to measure the formation dip angle to obtain the formation apparent dip angle, and therefore, the formation apparent dip angle can be obtained more quickly and accurately, and thus the drilling direction can be more accurately controlled in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0052] Figure 1 A schematic diagram of an application scenario provided for an embodiment of the present application;

[0053] Figure 2A flowchart of a method for controlling the drilling direction provided in one embodiment of the present application;

[0054] Figure 3 A flowchart of a method for controlling the drilling direction provided by another embodiment of the present application;

[0055] Figure 4 A schematic diagram of the drilling footage of a drilling rig drilling into a second formation and the content of rock cuttings in a first formation provided by an embodiment of the present application;

[0056] Figure 5a A schematic diagram of determining the apparent dip angle of a formation provided in one embodiment of the present application;

[0057] Figure 5b A schematic diagram of determining the apparent dip angle of a formation provided by another embodiment of the present application;

[0058] Figure 6 A schematic diagram of a natural gamma curve provided in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of the structure of a device for regulating the drilling direction provided in one embodiment of the present application;

[0060] Figure 8 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] Dip logging is the most effective and commonly used technology for measuring formation dip and inclination in a well. At present, the dip logging instrument is lowered into the well through a cable to measure the formation dip, and then the apparent dip of the formation is obtained. For horizontal wells, since the structure of the horizontal well is L-shaped and the cable is soft, it is difficult for the probe of the dip logging instrument to enter the horizontal well section under the action of vertical gravity. Even if the probe of the dip logging instrument can enter the horizontal well section, it is difficult to ensure that the probes of the dip logging instrument are perpendicular to the wellbore in the horizontal well section, and have a large intersection angle with the isotropic rock layer. The same problem exists for high-angle well sections. It is also possible to obtain the footage of the drilling rig drilling from one formation into another adjacent formation manually based on the logging curves such as natural gamma ray (GR) (including gamma while drilling), spontaneous potential (SP) and acoustic time difference (AC), and then determine the apparent dip of the formation based on the footage. The formation apparent dip angles obtained by the above methods are not accurate enough, resulting in the inability to accurately control the drilling direction.

[0063] Based on the above problems, the present application provides a method and device for regulating the drilling direction. When drilling a formation interface or a thin layer through a drilling rig, the apparent inclination of the formation is obtained based on the content of two types of rock cuttings, which is used for while-drilling geological guidance prediction of oil layers and other areas and real-time regulation of the drilling direction to improve the oil layer drilling rate.

[0064] In the following, the application scenarios of the solutions provided in this application are first illustrated.

[0065] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present application. Figure 1 As shown, in this application scenario, when the drilling equipment 110 drills from the sandstone layer 121 into the mudstone layer 122, the rock cuttings returned to the ground include sandstone layer rock cuttings and mudstone layer rock cuttings. The content of the sandstone layer rock cuttings and the content of the mudstone layer rock cuttings are determined by the analysis instrument 130, respectively. The computer device 140 obtains the corresponding formation apparent dip angle according to the drilling data such as the content of the sandstone layer rock cuttings, the content of the mudstone layer rock cuttings, and the footage of the drilling equipment 110, and transmits the formation apparent dip angle to the computer device 150 corresponding to the drilling control system through the network to control the drilling direction. The specific implementation process of the computer device 140 obtaining the corresponding formation apparent dip angle according to the drilling data such as the content of the sandstone layer rock cuttings, the content of the mudstone layer rock cuttings, and the footage of the drilling equipment 110 can be referred to the schemes of the following embodiments.

[0066] It should be noted that Figure 1 This is only a schematic diagram of an application scenario provided by the embodiment of the present application. Figure 1 does not limit the equipment included in Figure 1The positional relationship between the devices in the Figure 1 In the application scenario shown, a data storage device may also be included. The data storage device may be an external memory relative to the computer device 140 or the computer device 150 , or an internal memory integrated in the computer device 140 or the computer device 150 .

[0067] Next, the method for regulating the drilling direction is introduced through a specific embodiment.

[0068] Figure 2 The flowchart of the method for controlling the drilling direction provided in one embodiment of the present application. The method of the embodiment of the present application can be applied to an electronic device, which can be a server or a server cluster. Figure 2 As shown, the method of the embodiment of the present application includes:

[0069] S201. In the process of drilling from a first formation into a second formation of a target well by a drilling rig, the content of rock cuttings of the first formation drilled by the drilling rig and the footage of the drilling rig into the second formation are obtained.

[0070] In the embodiments of the present application, illustratively, the first stratum is a sandstone stratum, the second stratum is a mudstone stratum, and the target well includes a horizontal well section or a high-angle well section, and the present application is not limited thereto. Exemplarily, in the process of the drilling rig drilling from the sandstone stratum of the horizontal well section of the target well into the mudstone stratum, the content of the sandstone stratum cuttings and the content of the mudstone stratum cuttings drilled by the drilling rig can be obtained respectively based on the cuttings returned by the drilling rig. For example, if the content of the sandstone stratum cuttings drilled by the drilling rig is 90%, then the content of the mudstone stratum cuttings is 10%. The footage of the drilling rig drilling into the second stratum can be obtained in real time based on the drilling data corresponding to the drilling rig.

[0071] S202, determining a target angle according to the content, the wellbore diameter of the target well, and the footage.

[0072] The target angle is used to characterize the angle between the interface between the first stratum and the second stratum and the drilling direction along the drilling direction.

[0073] In this step, the diameter of the target well can be obtained based on the drill bit size and diameter expansion of the drilling rig (for example, 10% diameter expansion). After obtaining the content of the first formation cuttings drilled by the drilling rig and the footage of the drilling rig drilling into the second formation, the target angle can be determined based on the content of the first formation cuttings, the diameter of the target well, and the footage of the drilling rig drilling into the second formation. The target angle is the angle between the interface of the first formation and the second formation and the drilling direction along the drilling direction, and the angle is an acute angle. For how to determine the target angle, refer to the relevant technology or subsequent embodiments, which will not be repeated here.

[0074] S203, determining the formation apparent dip angle according to the well inclination angle of the target well and the target included angle.

[0075] In this step, the well inclination angle of the target well can be obtained in real time according to the drilling data corresponding to the drilling rig. After obtaining the well inclination angle of the target well and the target angle, the formation apparent dip angle can be determined. For how to determine the formation apparent dip angle, reference can be made to the relevant technology or subsequent embodiments, which will not be repeated here.

[0076] S204. Adjust the drilling direction of the drilling rig according to the apparent inclination angle of the formation.

[0077] In the embodiment of the present application, after obtaining the apparent dip angle of the formation, the drilling direction of the drilling rig can be adjusted according to the apparent dip angle of the formation. For example, when the drilling rig is drilling from the sandstone layer of the horizontal well section of the target well into the mudstone layer, the drilling direction of the drilling rig can be adjusted according to the apparent dip angle of the formation to ensure that the drilling rig is drilling in the mudstone layer.

[0078] It should be noted that the method of the embodiment of the present application can obtain the apparent inclination of the formation when the borehole is not orthogonal to the formation. The smaller the angle between the borehole and the formation in actual drilling, the higher the accuracy. When the borehole orientation is similar to the dip of the formation (dyke), the apparent inclination is close to the true inclination.

[0079] The method for controlling the drilling direction provided in the embodiment of the present application obtains the content of the first formation cuttings drilled by the drilling rig and the footage of the drilling rig drilling into the second formation during the process of the drilling rig drilling from the first formation of the target well into the second formation, determines the target angle according to the content, the wellbore diameter of the target well and the footage, determines the formation apparent dip angle according to the well inclination angle of the target well and the target angle, and controls the drilling direction of the drilling rig according to the formation apparent dip angle. Since the embodiment of the present application obtains the formation apparent dip angle based on the content of the first formation cuttings drilled by the drilling rig during the process of the drilling rig drilling from the first formation of the target well into the second formation, there is no need to lower the formation dip logging instrument into the well through a cable to measure the formation dip angle to obtain the formation apparent dip angle, and therefore, the formation apparent dip angle can be obtained more quickly and accurately, and the drilling direction can be more accurately controlled in real time.

[0080] Figure 3 This is a flow chart of a method for controlling the drilling direction provided by another embodiment of the present application. Based on the above embodiment, the embodiment of the present application further illustrates the method for controlling the drilling direction. Figure 3 As shown, the method of the embodiment of the present application may include:

[0081] S301. In the process of drilling from a first formation into a second formation of a target well by a drilling rig, the content of rock cuttings of the first formation drilled by the drilling rig and the footage of the drilling rig into the second formation are obtained.

[0082] The detailed description of this step can be found in Figure 2 The relevant description of S201 in the illustrated embodiment will not be repeated here.

[0083] S302: Determine the target height according to the content and the diameter of the target well.

[0084] The target height is used to represent the fan height corresponding to the second formation in the borehole cross-section circle corresponding to the footage position where the drilling rig drills into the second formation.

[0085] For example, Figure 4 A schematic diagram of the drilling footage of a drilling rig drilling into a second formation and the content of rock cuttings in a first formation provided by an embodiment of the present application, such as Figure 4 As shown, the first stratum is represented by A and the second stratum is represented by B, then Figure 4 The figure shows the process of the content of A rock cuttings changing from 100% to 0%, which corresponds to the process of the drilling rig drilling from the first formation A into the second formation B until it completely enters the second formation B. H represents the total footage of the drilling rig drilling from the first formation A into the second formation B, h represents the footage of the drilling rig drilling into the second formation B at a certain position, and in the borehole cross-section circle corresponding to the footage h position of the drilling rig drilling into the second formation B, d represents the fan height corresponding to the second formation B, that is, the target height, the well diameter of the target well (that is, the borehole diameter) is represented by D, and the well radius of the target well (that is, the borehole radius) is represented by R, then In this step, after obtaining the content of the first formation cuttings drilled by the drilling rig and the wellbore diameter of the target well, the target height can be determined according to the content of the first formation cuttings drilled by the drilling rig and the wellbore diameter of the target well.

[0086] Optionally, determining the target height based on the content and the borehole diameter of the target well may include: determining the bow angle corresponding to the second formation according to the following formula 1, the bow angle is used to characterize the bow angle corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determining the target height based on the bow angle and the borehole diameter of the target well.

[0087] x%=sin(a) / (2π)-a / 360+1Formula 1

[0088] Wherein, x% represents the content, and a represents the arc angle corresponding to the second stratum.

[0089] For example, refer to Figure 4 When the drilling rig drills from the first stratum A into the second stratum B, the volume ratio of A and B rock cuttings revealed by the drilling rig is proportional to the ratio of the arc area of ​​A and the arc area of ​​B in the borehole cross-section circle, and changes according to the depth of the footage. In the borehole cross-section circle corresponding to the footage position h of the drilling rig drilling into B, the arc angle corresponding to B is represented by a, and the arc area corresponding to A in the borehole cross-section circle is represented by S A Indicates that the arc area in the cross-section circle of the corresponding drilling hole is S B The cross-sectional area of ​​the drilled hole is πR. 2 =S A +SB =π(D / 2) 2 The content of A rock cuttings is expressed as x%, because x% = S A / (S A +S B )=S A / πR 2 , therefore, S A =x%×πR 2 At the same time, S A =(360-a)×πR 2 / 360+R 2 ×cos(a / 2)sin(a / 2), we can get: x%×πR 2 =(360-a)×πR 2 / 360+R 2 ×cos(a / 2)sin(a / 2), since sina=2×sin(a / 2)×cos(a / 2), we can get: x%=sin(a) / (2π)-a / 360+1, which is Formula 1. After obtaining the content x% of A cuttings, the arc angle a corresponding to the second formation can be determined according to Formula 1. After obtaining the arc angle a corresponding to the second formation, the target height d can be determined according to the arc angle a and the wellbore D of the target well.

[0090] Optionally, determining the target height according to the arc angle and the diameter of the target well may include: determining the target height according to the following formula 2:

[0091]

[0092] Wherein, d represents the target height, and D represents the diameter of the target well.

[0093] For example, refer to Figure 4 After obtaining the arc angle a corresponding to the second formation and the wellbore D of the target well, the target height d can be obtained according to Formula 2.

[0094] S303: Determine the target angle according to the target height and the footage.

[0095] In this step, after the target height and the footage of the drilling rig drilling into the second formation are obtained, the target angle can be determined according to the target height and the footage of the drilling rig drilling into the second formation.

[0096] Optionally, determining the target angle according to the target height and the footage may include: determining the target angle according to the following formula 3:

[0097] ∠β=atan(d / h) Formula 3

[0098] Among them, ∠β represents the target angle, and h represents the footage.

[0099] For example, refer to Figure 4 After obtaining the target height d and footage h, the target angle ∠β can be obtained according to Formula 3.

[0100] S304: Determine the formation apparent dip angle according to the well inclination angle of the target well and the target included angle.

[0101] exist Figure 2 Based on the relevant description of S203 in the illustrated embodiment, optionally, the formation apparent dip angle is determined according to the well inclination angle of the target well and the target included angle, including: if the well inclination angle is less than 90 degrees, the formation apparent dip angle is determined according to the following formula 4:

[0102] ∠δ=90°-∠α-∠β Formula 4

[0103] Among them, ∠δ represents the apparent dip angle of the formation, and ∠α represents the well inclination angle;

[0104] Alternatively, if the well inclination is greater than 90 degrees, the formation apparent dip angle is determined according to the following formula 5:

[0105] ∠δ=∠α-∠β-90° Formula 5

[0106] For example, Figure 5a A schematic diagram of determining the apparent dip angle of a formation provided in an embodiment of the present application is shown in FIG. Figure 5a As shown, Figure 5a The cylinder in the figure indicates the size and direction of the hole drilled by the drilling rig as the drill bit starts from the interface between the first stratum A and the second stratum B at a small angle and gradually penetrates into B until it is completely penetrated into B. During this process, the content of A rock cuttings changes from 100% to 0%, and the content of B rock cuttings changes from 0% to 100%. Figure 5a ∠α in the equation represents the well inclination angle of the target well, which is less than 90 degrees, ∠β represents the target angle, ∠δ represents the apparent dip angle of the formation, H represents the total footage of the drilling rig from A to B, and D represents the wellbore (i.e., the borehole diameter). After obtaining ∠α and ∠β, ∠δ can be obtained according to the above formula 4. It can be understood that when the drilling rig completely drills from A to B, that is, at the position of the total footage H in B, according to the above formula 3, ∠β=atan(D / H) can be obtained, and then ∠δ can be obtained according to the above formula 4.

[0107] It should be noted that Figure 5a In the embodiment, for the ultra-thin interlayer in B, the corresponding apparent dip angle of the formation can also be obtained by the method of the embodiment of the present application.

[0108] For example, Figure 5b A schematic diagram of determining the apparent dip angle of a formation provided in another embodiment of the present application is shown in FIG. Figure 5b As shown, Figure 5b The cylinder in the figure indicates the size and direction of the hole drilled by the drill rig as the drill bit starts from the interface between the first stratum M and the second stratum N at a small angle and gradually penetrates into N until it is completely penetrated into N. During this process, the content of M rock cuttings changes from 100% to 0%, and the content of N rock cuttings changes from 0% to 100%. Figure 5b ∠α1 in the formula represents the inclination angle of the target well, which is greater than 90 degrees, ∠β1 represents the target angle, ∠δ1 represents the apparent dip angle of the formation, H1 represents the total footage of the drilling rig from M to N, and D1 represents the wellbore (i.e., borehole diameter). After obtaining ∠α1 and ∠β1, ∠δ1 can be obtained according to the above formula five. It can be understood that when the drilling rig completely drills from M to N, that is, at the position corresponding to the total footage H1, according to the above formula three, ∠β1=atan(D1 / H1) can be obtained, and then ∠δ1 can be obtained according to the above formula five.

[0109] S305. Adjust the drilling direction of the drilling rig according to the apparent inclination of the formation.

[0110] The detailed description of this step can be found in Figure 2 The relevant description of S204 in the illustrated embodiment will not be repeated here.

[0111] Optional, see Figure 4 , for the drilling position x and y of the drilling rig into B, according to d x / h x =d y / h y =D / H (where d x Indicates the target height at x, h x Indicates the footage at x, d y Indicates the target height at y, h y The content of A is predicted according to the footage, and the thickness and distance of drilling into B are calculated according to the content of A. That is, it can be predicted how many meters more drilling is required to completely enter B. If B is a sandstone oil layer, it can be used to predict the thickness of the oil layer.

[0112] The method for controlling the drilling direction provided in the embodiment of the present application obtains the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig drilling into the second formation during the process of the drilling rig drilling from the first formation into the second formation of the target well, determines the target height according to the content and the wellbore diameter of the target well, determines the target angle according to the target height and the footage, determines the formation apparent dip according to the well inclination angle of the target well and the target angle, and controls the drilling direction of the drilling rig according to the formation apparent dip. Since the embodiment of the present application obtains the formation apparent dip based on the content of the first formation rock cuttings drilled by the drilling rig during the process of the drilling rig drilling from the first formation into the second formation of the target well, there is no need to lower the formation dip logging instrument into the well through a cable to measure the formation dip to obtain the formation apparent dip, and therefore, the formation apparent dip can be obtained more quickly and accurately, and the drilling direction can be more accurately controlled in real time.

[0113] Based on the above embodiments, illustratively, Table 1 is the drilling data corresponding to the apparent dip angle of the sand-mud surface formation in a well. As shown in Table 1, at a depth of 4942m in the well, the corresponding well inclination angle is 80°, that is, ∠α is 80°, and the borehole diameter (i.e., well diameter) is 0.242m (corresponding to a drill bit diameter of 215.9mm). Figure 6 A schematic diagram of a natural gamma curve provided in an embodiment of the present application is shown in FIG. Figure 6 As shown in the figure, H represents the total footage of the drilling rig from the first formation to the second formation. Corresponding to the well depth of 4942m in Table 1, H is 2.0m. Figure 6 The total footage H, according to the above formula 3, where d = 0.242m, h = 2.0m, then ∠β = atan (0.242 / 2) = 6.9°, and then according to the above formula 4, the apparent dip angle of the sand-mud surface formation ∠δ = 90°-∠α-∠β = 90°-80°-6.9° = 3.1° can be obtained. Combined with the borehole orientation 100.62° and the structural background in Table 1, it can be determined that the formation in the target direction is nearly east-dipping, and the apparent dip angle of the formation is 3.1°.

[0114] Table 1 Drilling data corresponding to the apparent dip angle of sand-mud surface in a well

[0115]

[0116]

[0117] In summary, the technical solution provided by this application has at least the following advantages:

[0118] (1) The occurrence of strata, oil layers or rock masses can be known in a short time, providing technical assistance for subsequent drilling and prediction;

[0119] (2) Real-time formation apparent dip can be used to determine structural height and formation trend, providing a basis and help for layer control while drilling, geological understanding and prediction, greatly increasing the reliability and control of drilling such as oil layer drilling rate. Knowing the formation occurrence with little additional cost can conditionally replace and make up for the formation dip logging in current technology, saving the investment cost of formation dip logging.

[0120] (3) It is suitable for various drilling fields such as oil horizontal wells, high-angle directional wells, high-steep formation drilling, geological and mineral exploration and development, coal exploration and mining, tunnel engineering and daily work, and has broad application industries and prospects.

[0121] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0122] Figure 7 A schematic diagram of the structure of a device for controlling the drilling direction provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the drilling direction control device 700 of the embodiment of the present application includes: an acquisition module 701, a determination module 702, a processing module 703 and a control module 704. Among them:

[0123] The acquisition module 701 is used to acquire the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig into the second formation during the process of the drilling rig drilling from the first formation into the second formation of the target well.

[0124] The determination module 702 is used to determine the target angle according to the content, the diameter of the target well and the footage. The target angle is used to characterize the angle between the interface between the first formation and the second formation and the drilling direction along the drilling direction.

[0125] The processing module 703 is used to determine the formation apparent dip angle according to the well inclination angle of the target well and the target included angle.

[0126] The control module 704 is used to control the drilling direction of the drilling rig according to the apparent dip angle of the formation.

[0127] In some embodiments, the determination module 702 is specifically used to: determine the target height based on the content and the diameter of the target well, the target height is used to characterize the fan height corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determine the target angle based on the target height and the footage.

[0128] Optionally, the determination module 702 is specifically used to: determine the bow angle corresponding to the second formation according to the following formula 1, the bow angle is used to characterize the bow angle corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; determine the target height according to the bow angle and the wellbore diameter of the target well.

[0129] x%=sin(a) / (2π)-a / 360+1 Formula 1

[0130] Wherein, x% represents the content, and a represents the arc angle corresponding to the second stratum.

[0131] Optionally, the determination module 702 is specifically configured to determine the target height according to the following formula 2:

[0132]

[0133] Wherein, d represents the target height, and D represents the diameter of the target well.

[0134] Optionally, the determination module 702 is specifically configured to determine the target angle according to the following formula 3:

[0135] ∠β=atan(d / h) Formula 3

[0136] Among them, ∠β represents the target angle, and h represents the footage.

[0137] In some embodiments, the processing module 703 is specifically used to: if the well inclination angle is less than 90 degrees, determine the formation apparent dip angle according to the following formula 4:

[0138] ∠δ=90°-∠α-∠β Formula 4

[0139] Among them, ∠δ represents the apparent dip angle of the formation, and ∠α represents the well inclination angle;

[0140] Alternatively, if the well inclination is greater than 90 degrees, the formation apparent dip angle is determined according to the following formula 5:

[0141] ∠δ=∠α-∠β-90° Formula 5.

[0142] The device of this embodiment can be used to execute the technical solution of any of the above-mentioned method embodiments. Its implementation principle and technical effects are similar and will not be repeated here.

[0143] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. For example, the electronic device can be provided as a server or a computer. Figure 8 , the electronic device 800 includes a processing component 801, which further includes one or more processors, and a memory resource represented by a memory 802, for storing instructions that can be executed by the processing component 801, such as an application. The application stored in the memory 802 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 801 is configured to execute instructions to perform any of the above method embodiments.

[0144] The electronic device 800 may further include a power supply component 803 configured to perform power management of the electronic device 800, a wired or wireless network interface 804 configured to connect the electronic device 800 to a network, and an input / output (I / O) interface 805. The electronic device 800 may operate based on an operating system stored in the memory 802, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™ or the like.

[0145] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the method for controlling the drilling direction as described above is implemented.

[0146] The present application also provides a computer program product, including a computer program, which implements the above-mentioned method for controlling the drilling direction when executed by a processor.

[0147] The computer-readable storage medium mentioned above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0148] An exemplary readable storage medium is coupled to the processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the control device for the drilling direction.

[0149] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling drilling direction, characterized in that: include: In the process of drilling from the first formation into the second formation of the target well by the drilling rig, obtaining the content of the first formation rock cuttings drilled by the drilling rig and the footage of the drilling rig into the second formation; Determine a target angle according to the content, the wellbore diameter of the target well, and the footage, wherein the target angle is used to characterize the angle between the interface between the first formation and the second formation and the drilling direction along the drilling direction; Determining the formation apparent dip angle according to the well inclination angle of the target well and the target included angle; The drilling direction of the drilling rig is regulated according to the apparent inclination angle of the formation.

2. The method for controlling the drilling direction according to claim 1, characterized in that: Determining the target angle according to the content, the well diameter of the target well and the footage includes: Determine a target height according to the content and the well diameter of the target well, wherein the target height is used to represent the fan height corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; The target angle is determined according to the target height and the footage.

3. The method for controlling the drilling direction according to claim 2, characterized in that: Determining the target height according to the content and the well diameter of the target well includes: According to the following formula 1, the arc angle corresponding to the second formation is determined, and the arc angle is used to represent the arc angle corresponding to the second formation in the borehole cross-section circle corresponding to the footage position of the drilling rig drilling into the second formation; Determining the target height according to the arc angle and the well diameter of the target well; x%=sin(a) / (2π)-a / 360+1 Formula 1 Wherein, x% represents the content, and a represents the arc angle corresponding to the second formation.

4. The method for controlling the drilling direction according to claim 3, characterized in that: Determining the target height according to the arc angle and the well diameter of the target well includes: According to the following formula 2, the target height is determined: Wherein, d represents the target height, and D represents the well diameter of the target well.

5. The method for controlling the drilling direction according to claim 2, characterized in that: The step of determining the target angle according to the target height and the footage includes: According to the following formula 3, the target angle is determined: ∠β=atan(d / h) Formula 3 Wherein, ∠β represents the target angle, and h represents the footage.

6. The method for controlling the drilling direction according to any one of claims 1 to 5, characterized in that: Determining the formation apparent dip angle according to the well inclination angle of the target well and the target included angle comprises: If the well inclination angle is less than 90 degrees, the formation apparent dip angle is determined according to the following formula 4: ∠δ=90°-∠α-∠β Formula 4 Wherein, ∠δ represents the apparent dip angle of the formation, and ∠α represents the well inclination angle; or, If the well inclination angle is greater than 90 degrees, the formation apparent dip angle is determined according to the following formula 5: ∠δ=∠α-∠β-90° Formula 5.

7. A device for controlling the drilling direction, characterized in that: include: An acquisition module, used for acquiring the content of rock cuttings of the first formation drilled by the drilling rig and the footage of the drilling rig drilling into the second formation during the process of the drilling rig drilling from the first formation into the second formation of the target well; a determination module, configured to determine a target angle according to the content, the wellbore diameter of the target well, and the footage, wherein the target angle is used to characterize an angle between an interface between the first formation and the second formation and the drilling direction along the drilling direction; A processing module, used for determining the formation apparent dip angle according to the well inclination angle of the target well and the target included angle; The control module is used to control the drilling direction of the drilling rig according to the apparent dip angle of the formation.

8. An electronic device, characterized in that: include: Memory and processor; The memory is used to store program instructions; The processor is used to call the program instructions in the memory to execute the drilling direction control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed, the method for controlling the drilling direction according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for controlling the drilling direction as described in any one of claims 1 to 6 is implemented.

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