Calibration method for top drive load of drilling machine of floating drilling platform

Abstract

The invention discloses a floating drilling platform drilling machine top drive load calibration method. The method comprises the steps that a symmetrical suspension structure is constructed below a to-be-calibrated top drive; the symmetrical suspension structure comprises a rectangular structure and an isosceles trapezoid structure; electronic tension meters are arranged on the two sides of the symmetrical suspension structure; a calibration object is connected below the symmetrical suspension structure; lifting operation is carried out on the top drive, and the tension of the electronic tension meter is read after the lifting operation is completed; based on the pulling force and the weight of the symmetrical suspension structure, top drive load analysis is carried out through an equivalent mathematical model of the symmetrical suspension structure, and the loading force of a top drive is obtained; and carrying out load calibration on the top drive based on the load force. According to the method, a conventional tool of a drilling system is used as a measuring tool, a symmetrical suspension structure comprising a rectangular structure and an isosceles trapezoid structure is constructed, and an electronic tension meter is arranged for tension measurement, so that accurate calibration of the top drive load is realized.

Description

Technical Field

[0001] The present invention relates to top drive load calibration, and in particular to a calibration method for the top drive load of a floating drilling rig. Background Art

[0002] As a key equipment for offshore drilling operations, the performance of the top drive system of a floating drilling rig is directly related to the efficiency and safety of drilling operations. Top drive load calibration is an important link to ensure that the top drive system accurately reflects the actual load and guarantees the stability of operations. Traditional top drive load calibration methods often rely on complex mechanical structures and manual measurements. The on-site fabricated measurement tooling increases the complexity of measurement, and the accuracy of the self-weight of the large-load top drive measurement tooling is likely to affect the accurate calibration of the top drive load. Conventional measurement methods are not only cumbersome to operate, but also the accuracy is easily affected by various factors. Summary of the Invention

[0003] The present invention aims to solve the problems of related technical limitations to at least a certain extent. For this purpose, the present invention provides a calibration method for the top drive load of a floating drilling rig, which can accurately calibrate the top drive load of a floating drilling rig.

[0004] On the one hand, an embodiment of the present invention provides a calibration method for the top drive load of a floating drilling rig, including the following steps:

[0005] Construct a symmetric suspension structure below the top drive to be calibrated; the symmetric suspension structure includes a rectangular structure and an isosceles trapezoidal structure; electronic tension meters are arranged on both sides of the symmetric suspension structure; a calibration object is connected below the symmetric suspension structure;

[0006] Lift the top drive, and read the tension of the electronic tension meter after the lifting operation is completed;

[0007] Based on the tension and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive;

[0008] Perform load calibration on the top drive based on the load force.

[0009] Optionally, the method further includes the following steps:

[0010] Connect two sling rings on both sides below the top drive; the two sling rings have the same specifications;

[0011] Connect a first hydraulic elevator below the two sling rings, and sequentially arrange a heavy drill pipe and a second hydraulic elevator below the first hydraulic elevator; the first hydraulic elevator locks the upper part of the heavy drill pipe, and the second hydraulic elevator locks the lower part of the heavy drill pipe; the heavy drill pipe passes through the center of the rotary table on the drill floor to reach the moonpool deck surface;

[0012] Based on the second hydraulic elevator connecting the symmetric suspension structure.

[0013] Optionally, when the symmetric suspension structure is an isosceles trapezoid structure; constructing a symmetric suspension structure under the top drive to be calibrated includes the following steps:

[0014] Connect two traction belts to the earrings on both sides of the second hydraulic elevator; electronic tension meters are arranged at the same position in the middle of the two traction belts;

[0015] Connect the lower ends of the two traction belts to both ends of the calibration object; the widths of the lower ends of the two traction belts are not equal to the width of the second hydraulic elevator.

[0016] Optionally, the calibration object includes a tray and a counterweight block; connecting the lower ends of the two traction belts to both ends of the calibration object includes the following steps:

[0017] Connect the lower ends of the two traction belts to both ends of the tray;

[0018] Transfer the counterweight block above the tray.

[0019] Optionally, the calibration object is the pontoon drilling platform moonpool deck body; connecting the lower ends of the two traction belts to both ends of the calibration object includes the following steps:

[0020] Connect the lower ends of the two traction belts to both sides of the pontoon drilling platform moonpool deck body;

[0021] Wherein, the angles formed by the two traction belts and the surface of the pontoon drilling platform moonpool deck body are the same.

[0022] Optionally, when the symmetric suspension structure is a rectangular structure; constructing a symmetric suspension structure under the top drive to be calibrated includes the following steps:

[0023] Connect two traction belts to the earrings on both sides of the second hydraulic elevator; electronic tension meters are arranged at the same position in the middle of the two traction belts;

[0024] Connect the lower ends of the two traction belts to the calibration object; the widths of the lower ends of the two traction belts are equal to the width of the second hydraulic elevator.

[0025] Optionally, connecting two traction belts to the earrings on both sides of the second hydraulic elevator includes the following steps:

[0026] Connect two first sling belts to the earrings on both sides of the second hydraulic elevator;

[0027] Connect electronic tension meters to the lower ends of the two first sling belts respectively;

[0028] Connect steel cables or second sling belts under the two electronic tension meters respectively;

[0029] A traction belt is formed by successively connecting a first sling belt, an electronic tensiometer, and a steel cable or a second sling belt.

[0030] Optionally, connecting the two traction belts to a calibration object at the lower part, including the following steps:

[0031] Connect the lower parts of the two traction belts to a connector; the width of the connector is equal to the width of the second hydraulic elevator clamp;

[0032] Connect a water bag under the connector.

[0033] Optionally, when the symmetric suspension structure is a rectangular structure; based on the tensile force and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive, including the following steps:

[0034] Obtain the load force of the top drive according to the sum of the equivalent weights of the tensile forces of the two electronic tensiometers and the weight of the symmetric suspension structure;

[0035] Among them, the expression of the load force is:

[0036]

[0037] In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the tensile forces of the two electronic tensiometers; g represents the acceleration due to gravity.

[0038] Optionally, when the symmetric suspension structure is an isosceles trapezoid structure; based on the tensile force and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive, including the following steps:

[0039] Obtain the side lengths of the isosceles trapezoid structure; the side lengths include the upper side length, the lower side length, and the waist length;

[0040] Based on the tensile force and the weight of the symmetric suspension structure, combine the side lengths of the isosceles trapezoid structure to perform top drive load analysis to obtain the load force of the top drive;

[0041] Among them, the expression of the load force is:

[0042]

[0043] In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the tensile forces of the two electronic tensiometers; g represents the acceleration due to gravity; S represents the waist length; X represents the upper side length; Y represents the lower side length.

[0044] The embodiment of the present invention constructs a symmetrical suspension structure below the top drive to be calibrated; the symmetrical suspension structure includes a rectangular structure and an isosceles trapezoidal structure; electronic dynamometers are arranged on both sides of the symmetrical suspension structure; a calibration object is connected below the symmetrical suspension structure; a lifting operation is performed on the top drive, and the tension of the electronic dynamometer is read after the lifting operation is completed; based on the tension and the weight of the symmetrical suspension structure, the top drive load is analyzed through an equivalent mathematical model of the symmetrical suspension structure to obtain the load force of the top drive; and the load of the top drive is calibrated based on the load force. The present invention realizes accurate calibration of the top drive load by constructing a symmetrical suspension structure including a rectangular structure and an isosceles trapezoidal structure, and arranging an electronic dynamometer for tension measurement. The design of the symmetrical suspension structure allows the suspension to be uniformly stressed during the lifting process, reducing the measurement error caused by the deflection or shaking of the suspension. At the same time, the high-precision measurement capability of the electronic dynamometer also ensures the accuracy of the tension data, thereby improving the accuracy of the top drive load calibration. Compared with the traditional calibration method, this method does not require complex mechanical structures and manual measurement steps. It can complete the calibration through simple lifting operations and dynamometer readings, which greatly simplifies the calibration process and improves work efficiency. This method is applicable to top drive systems of floating drilling platforms of different models and specifications. It only needs to adjust the weight of the suspension structure and the calibration object according to the actual load capacity of the top drive. It has strong versatility and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0046] Figure 1 It is a flow chart of a method for calibrating a top drive load of a floating drilling platform provided by an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of an extended process of a method for calibrating a top drive load of a floating drilling platform provided by an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of an experimental device example 1 of a method for calibrating a top drive load of a drilling rig provided in an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of an expanded flow chart of step S100 provided in an embodiment of the present invention;

[0050] Figure 5 A schematic diagram of an experimental device example 2 of a method for calibrating a top drive load of a drilling rig provided in an embodiment of the present invention;

[0051] Figure 6 Another schematic diagram of the expansion process of step S100 provided in an embodiment of the present invention;

[0052] Figure 7 Schematic diagram of Example 3 of the experimental device for the calibration method of the top drive load provided by the embodiment of the present invention;

[0053] Figure 8 Schematic diagram of the deployment process of connecting two traction belts to the earrings on both sides of the second hydraulic elevating work string slip provided by the embodiment of the present invention;

[0054] Figure 9 provided by the embodiment of the present invention Figure 3 Schematic diagram of the isosceles rectangular structure of Example 1 of the experimental device;

[0055] Figure 10 provided by the embodiment of the present invention Figure 9 Schematic diagram of the equivalent mathematical model of the isosceles rectangular structure. Detailed implementation manners

[0056] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0057] It should be noted that although functional modules are divided in the system schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different module division in the system or a different order in the flowchart. The terms "first / S100", "second / S200", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0058] The mention of "embodiment" in this document means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] Refer to Figure 1 , Figure 1 Flowchart of the calibration method for the top drive load of a floating drilling rig applied to a server provided by the embodiment of the present invention. Refer to Figure 1 , the method includes the following steps:

[0060] S100. Construct a symmetric suspension structure under the top drive to be calibrated;

[0061] Among them, the symmetric suspension structure includes a rectangular structure and an isosceles trapezoidal structure; electronic tensiometers are arranged on both sides of the symmetric suspension structure; a calibration object is connected below the symmetric suspension structure.

[0062] It should be noted that in some embodiments, as Figure 2 shown, the method may further include the following steps: T100. Connect two lifting rings on both sides below the top drive; the two lifting rings have the same specifications; T200. Connect a first hydraulic elevator below the two lifting rings, and sequentially arrange a heavy drill pipe and a second hydraulic elevator below the first hydraulic elevator; the first hydraulic elevator locks the upper part of the heavy drill pipe, and the second hydraulic elevator locks the lower part of the heavy drill pipe; the heavy drill pipe passes through the center of the rotary table on the drill floor to reach the moonpool deck surface; T300. Connect the symmetric suspension structure based on the second hydraulic elevator.

[0063] Exemplarily, in some specific embodiments, as Figure 3 shown, two lifting rings 2 are connected below the top drive 1 of the floating drilling rig. A first hydraulic elevator 3 (i.e., the first hydraulic elevator) is connected below the lifting rings 2. The upper part of the heavy drill pipe is locked by the first hydraulic elevator 3, and the lower part of the heavy drill pipe 4 is locked by the second hydraulic elevator 5 (i.e., the second hydraulic elevator). The heavy drill pipe 4 passes through the center of the rotary table on the drill floor to reach the moonpool deck surface.

[0064] It should be noted that in some embodiments, as Figure 4 shown, when the symmetric suspension structure is an isosceles trapezoidal structure; step S100 may include the following steps: S110. Connect two traction belts to the ear rings on both sides of the second hydraulic elevator; electronic tensiometers are arranged at the same position in the middle of the two traction belts; S120. Connect the lower parts of the two traction belts to both ends of the calibration object; the widths of the lower ends of the two traction belts are not equal to the width of the second hydraulic elevator.

[0065] Among them, in some embodiments, the calibration object includes a tray and a counterweight; connecting the lower parts of the two traction belts to both ends of the calibration object may include the following steps: connecting the lower parts of the two traction belts to both ends of the tray; transporting the counterweight above the tray.

[0066] Exemplarily, in some specific embodiments, as Figure 3 shown, traction belts (the traction belts may include: sling belts 6, electronic tensiometers 7 respectively connected to the lower ends of the two sling belts 6, and steel cables or sling belts 8 respectively passing through the lower parts of the two electronic tensiometers 7) are respectively passed through the ear rings on both sides of the second hydraulic elevator 5. The lower parts of the two steel cables or sling belts 8 are connected to both ends of the tray 9, and an appropriate amount of counterweight 10 is placed on the tray 9. The tray 10 is placed on the moonpool trolley at the moonpool opening.

[0067] Among them, in some embodiments, the calibration object is the pontoon drilling platform moonpool deck body; connecting the lower ends of the two traction belts to both ends of the calibration object may include the following steps: connecting the lower ends of the two traction belts to both sides of the pontoon drilling platform moonpool deck body. Among them, the angles formed by the two traction belts and the surface of the pontoon drilling platform moonpool deck body are the same.

[0068] Exemplarily, in some specific embodiments, as Figure 5 shown, the earrings on both sides of the second hydraulic elevator clamp 5 respectively pass through the sling belts 6, electronic tension meters 7 are respectively connected to the lower ends of the two sling belts 6, the lower ends of the two electronic tension meters 7 respectively pass through steel cables or sling belts 8, and the lower ends of the two steel cables or sling belts 8 are connected to the pontoon drilling platform moonpool deck body to ensure that the connection points can withstand the maximum load of the top drive.

[0069] It should be noted that, in some embodiments, as Figure 6 shown, when the symmetric suspension structure is a rectangular structure; step S100 may include the following steps: S130. Connect two traction belts to the earrings on both sides of the second hydraulic elevator clamp; electronic tension meters are arranged at the same position in the middle of the two traction belts; S140. Connect the lower ends of the two traction belts to the calibration object; the widths of the lower ends of the two traction belts are equal to the width of the second hydraulic elevator clamp.

[0070] Among them, in some embodiments, connecting the lower ends of the two traction belts to the calibration object may include the following steps: connecting the lower ends of the two traction belts to the connector; the width of the connector is equal to the width of the second hydraulic elevator clamp;

[0071] Connect a water bag below the connector.

[0072] Exemplarily, in some specific embodiments, as Figure 7 shown, the earrings on both sides of the second hydraulic elevator clamp 5 respectively pass through the sling belts 6, electronic tension meters 7 are respectively connected to the lower ends of the two sling belts 6, the lower ends of the two electronic tension meters 7 respectively pass through steel cables or sling belts 8, and the lower ends of the two steel cables or sling belts 8 are connected to the connector 12, and the connector 12 is connected to the water bag 13 below to ensure that the mass of the water contained in the water bag 13 can meet the maximum load of the top drive.

[0073] It should also be noted that, in some embodiments, as Figure 8 shown, connecting two traction belts to the earrings on both sides of the second hydraulic elevator clamp may include the following steps: S11. Connect two first sling belts to the earrings on both sides of the second hydraulic elevator clamp; S12. Respectively connect electronic tension meters to the lower ends of the two first sling belts; S13. Respectively connect steel cables or second sling belts below the two electronic tension meters; S14. Form traction belts according to the sequentially connected first sling belts, electronic tension meters, and steel cables or second sling belts.

[0074] Exemplarily, in some specific embodiments, such as Figure 3 , Figure 5 and Figure 7 shown, the traction belt includes: a sling belt 6, electronic dynamometers 7 respectively connected to the lower ends of the two sling belts 6, and steel cables or sling belts 8 respectively passing out below the two electronic dynamometers 7.

[0075] S200. Perform a lifting operation on the top drive, and read the pulling force of the electronic dynamometer after the lifting operation is completed;

[0076] Exemplarily, in some specific embodiments, lift the top drive, record the readings of the two electronic dynamometers 8, and denote them as F1 and F2 respectively.

[0077] S300. Based on the pulling force and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive;

[0078] It should be noted that in some embodiments, when the symmetric suspension structure is a rectangular structure; step S300 may include the following steps: obtain the load force of the top drive according to the sum of the equivalent weights of the pulling forces of the two electronic dynamometers and the weight of the symmetric suspension structure; wherein, the expression of the load force is:

[0079]

[0080] In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the pulling forces of the two electronic dynamometers; g represents the acceleration due to gravity.

[0081] Exemplarily, in some specific embodiments, use the top drive load calculation formula to calculate the load force of the top drive in the current state, and perform calibration based on this in sequence. Top drive load calculation formula:

[0082]

[0083] wherein, as Figure 7 shown: T is the load of the top drive, t; M is the total weight of the lifting ring 2, the first hydraulic elevator 3, the heavy drill pipe 4, the second hydraulic elevator 5, and the sling belt 6, t; g is the acceleration due to gravity, 9.8 m / s 2 ; F1 and F2 are the readings of the two electronic dynamometers respectively, KN.

[0084] It should be noted that in some embodiments, when the symmetric suspension structure is an isosceles trapezoid structure; step S300 may include the following steps: obtain the side lengths of the isosceles trapezoid structure; the side lengths include the upper side length, the lower side length, and the waist length; based on the pulling force and the weight of the symmetric suspension structure, perform top drive load analysis in combination with the side lengths of the isosceles trapezoid structure to obtain the load force of the top drive;

[0085] Among them, the expression of the load force is as follows:

[0086]

[0087] In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the tensile forces of two electronic tensiometers; g represents the acceleration due to gravity; S represents the waist length; X represents the upper side length; Y represents the lower side length.

[0088] Exemplarily, in some specific embodiments, such as Figure 9 and Figure 10 shown, for the isosceles trapezoid structure, the present invention adopts another top drive load calculation formula to calculate the load force of the top drive in the current state, and calibrates it successively based on this. The other top drive load calculation formula is as follows:

[0089]

[0090] Among them, as Figure 3 and Figure 5 : T is the load of the top drive, t; M is the total weight of the lifting ring 2, the first hydraulic elevator 3, the heavy drill pipe 4, the second hydraulic elevator 5, and the sling 6, t; g is the acceleration due to gravity, 9.8m / s 2 ; F1 and F2 are the readings of the two electronic tensiometers respectively, KN; X is the distance between the ear rings on both sides of the hydraulic elevator 5, m; Figure 3 In the example, Y is the distance between the suspension points on both sides of the tray 9, m; Figure 5 In the example, Y is the distance between the two connection points of the sling or steel cable 8 and the moonpool deck body of the floating drilling platform, m; S is the total length composed of the sling 6, the electronic tensiometer 7, and the sling or steel cable 8 connecting the hydraulic elevator 5 and both sides of the tray 9 / floating drilling platform moonpool deck body, m.

[0091] S400. Perform load calibration on the top drive based on the load force.

[0092] Exemplarily, in some specific embodiments, calculate the load force of the top drive in the corresponding state, and then calibrate it based on this.

[0093] To explain the principle of the technical solution of the present invention in detail, the following combines some specific embodiments to illustrate the overall process of the present invention. It is easy to understand that the following is an explanation of the technical principle of the present invention and cannot be regarded as a limitation of the present invention.

[0094] First of all, it should be noted that the top drive, as one of the core components of the drilling system, has functions such as lifting and rotating the drill string. Calibrating the load of the top drive of the drilling rig is an effective method to ensure the reliable and stable lifting function of the top drive, and it can know the true weight of the drill string lifted by the lower part of the top drive during the actual drilling process. As a special lifting equipment, it is a common practice in the industry and among equipment manufacturers to conduct a lifting capacity calibration experiment after the installation of the top drive.

[0095] Among them, for the top drive load calibration, usually at least three different weights need to be measured, two of which are calibration values and one is a test value. During the weight calibration, by lifting two known weights, the weight measured by the top drive is adjusted to the value of the known weight. Then, another different known weight is used as the test value, and the top drive is used to lift this weight to check whether the weight measured by the top drive is consistent with the known weight.

[0096] There are two existing methods for calibrating the weight of the top drive: 1. For example, the weight calibration method pointed out by Yang Zilong, which uses a steel structure ground anchor and applies a load to the top drive by tensioning the oil cylinder. This method is applicable to onshore drilling rigs and can use the ground structure as the bearing point, but it is not applicable to floating drilling platforms. Because the bottom of the floating drilling platform is seawater, the drilling rig and the top are arranged at the wellhead center on the drill floor, and below the wellhead center is the moonpool, which is directly connected to the seawater, and it is impossible to provide an anchor point directly below like onshore drilling.

[0097] 2. For floating drilling platforms, Sun Hongguo and on-site engineers usually use another method to calibrate the top drive. That is, according to the weight required for the top drive calibration, counterweights are prepared. Each time, the counterweights are transported to the moonpool, and slings and shackles are used to connect the top drive and the counterweights, and the counterweights are lifted in batches using the top drive. If three sets of weights are used for calibration, the counterweights need to be transported, installed, and the slings need to be connected three times. This calibration method has two problems: ① For the calibration of large-load equipment, large-scale slings are required, and the length of the slings is often long, occupying a large weight, and this part of the weight is not easy to accurately weigh, and the connection of the slings is cumbersome. ② Repeatedly transporting the counterweights and connecting the slings is a cumbersome process, and the calibration experiment has a long construction period.

[0098] In view of the above problems, the present invention proposes a method for calibrating the load of the top drive of a floating drilling platform by using drilling equipment as a connecting piece.

[0099] The following is an elaboration in combination with specific embodiments:

[0100] Example 1, as Figure 3 shown:

[0101] 1. Two lifting rings 2 are connected below the top drive 1. A hydraulic elevator one 3 is connected below the lifting rings 2. The upper part of the heavy drill pipe 4 is locked by the hydraulic elevator one 3. The lower part of the heavy drill pipe 4 is locked by the hydraulic elevator two 5. The heavy drill pipe 4 passes through the center of the rotary table on the drill floor and reaches the moon pool deck surface. The ear rings on both sides of the hydraulic elevator two 5 respectively pass through the sling belts 6. Electronic tension meters 7 are respectively connected to the lower ends of the two sling belts 6. The steel cables or sling belts 8 respectively pass through the lower parts of the two electronic tension meters 7. The lower parts of the two steel cables or sling belts 8 are connected to both ends of the tray 9. An appropriate amount of counterweight blocks 10 are placed on the tray 9. The tray 10 is placed on the moon pool trolley 11 at the moon pool opening.

[0102] 2. The top drive 1 is responsible for lifting the suspended objects below, including: the lifting rings 2, the hydraulic elevator one 3, the heavy drill pipe 4, the hydraulic elevator two 5; the sling belts 6; the electronic tension meters 7; the steel cables or sling belts 8; the tray 9; the counterweight blocks 10.

[0103] 3. The lengths of the sling belts 6, the electronic tension meters 7, and the sling belts or steel cables 8 connected to both sides of the hydraulic elevator 5 and the tray 9 should be equal.

[0104] 4. The electronic tension meter 7 can display the tension borne by the steel cable or sling belt 8.

[0105] 5. The distances from the suspension points on both sides of the tray 9 to the projection point of the wellhead center in the moon pool should be equal.

[0106] 6. Tools can be used to ensure that the angles of the sling belts 6, the electronic tension meters 7, and the sling belts or steel cables 8 in the vertical direction remain unchanged.

[0107] As Figure 3 shown, it is a schematic diagram of Example 1 of the experimental device for the calibration method of the load of the top drive of a drilling rig according to the present invention, showing that two lifting rings 2 are connected below the top drive 1 of the floating drilling platform rig. A hydraulic elevator one 3 is connected below the lifting rings 2. The upper part of the heavy drill pipe is locked by the hydraulic elevator one 3. The lower part of the heavy drill pipe 4 is locked by the hydraulic elevator two 5. The heavy drill pipe 4 passes through the center of the rotary table on the drill floor and reaches the moon pool deck surface. The ear rings on both sides of the hydraulic elevator two 5 respectively pass through the sling belts 6. Electronic tension meters 7 are respectively connected to the lower ends of the two sling belts 6. The steel cables or sling belts 8 respectively pass through the lower parts of the two electronic tension meters 7. The lower parts of the two steel cables or sling belts 8 are connected to both ends of the tray 9. An appropriate amount of counterweight blocks 10 are placed on the tray 9. The tray 10 is placed on the moon pool trolley at the moon pool opening.

[0108] The specific experimental steps are as follows:

[0109] 1. Transfer enough counterweight blocks 10 at one time and place them above the tray 9;

[0110] 2. Weigh the lifting rings 2, the hydraulic elevator one 3, the heavy drill pipe 4, the hydraulic elevator two 5, and the sling belts 6, and record the total weight as M;

[0111] 3. Measure the distance between the two earrings on both sides of the hydraulic elevator clamp 5, denoted as X;

[0112] 4. Measure the distance between the two lifting points on both sides of the tray 9, denoted as Y;

[0113] 5. Measure the total length of the sling belts 6, electronic tension meters 7 and sling belts or steel cables 8 connecting both sides of the hydraulic elevator clamp 5 and the tray 9, denoted as S;

[0114] 6. Assemble the experimental device for calibrating the load of the drilling rig top drive, and place a counterweight block with a weight exceeding the maximum load specified in the top drive design in the tray 9;

[0115] 7. Lift the top drive and record the readings of the two electronic tension meters 8, denoted as F1 and F2 respectively;

[0116] 8. Use the top drive load calculation formula to calculate the load force of the top drive in the current state, and perform calibration based on this.

[0117]

[0118] Where: T is the load of the top drive, in t; M is the total weight of the lifting rings 2, hydraulic elevator clamp 1 3, heavy drill pipe 4, hydraulic elevator clamp 2 5, and sling belt 6, in t; g is the acceleration due to gravity, 9.8 m / s 2 ; F1 and F2 are the readings of the two electronic tension meters respectively, in kN; X is the distance between the two earrings on both sides of the hydraulic elevator clamp 5, in m; Y is the distance between the two lifting points on both sides of the tray 9, in m; S is the total length of the sling belts 6, electronic tension meters 7 and sling belts or steel cables 8 connecting both sides of the hydraulic elevator clamp 5 and the tray 9, in m.

[0119] Specifically, through the readings of the tension meters, the present invention can obtain the tension borne below the electronic tension meter 7, and combined with the distance between the two earrings on both sides of the hydraulic elevator clamp 5, the distance between the two lifting points on both sides of the tray 9, and the total length of the sling belts 6, electronic tension meters 7 and sling belts or steel cables 8 connecting both sides of the hydraulic elevator clamp 5 and the tray 9, the tension borne by the electronic tension meter 7 in the vertical direction can be calculated. Combined with the total weight of the lifting rings 2, hydraulic elevator clamp 1 3, heavy drill pipe 4, hydraulic elevator clamp 2 5, and sling belt 6, the load borne by the drilling rig top drive can be calculated. The technical solution of the present invention can calibrate any weight load between the total weight of the lifting rings 2, hydraulic elevator clamp 1 3, heavy drill pipe 4, hydraulic elevator clamp 2 5, and sling belt 6 and the maximum load specified in the top drive design, and obtain more parameters. Among them, the counterweight block on the tray can be hoisted in one go, with fewer hoisting times, higher efficiency, stronger safety, and can also save labor and material costs. And under some conditions allowing, the counterweight block can be omitted, and the sling belt or steel cable 8 can be directly connected to the moonpool deck body of the floating drilling platform.

[0120] Compared with the prior art, the present invention has at least the following beneficial effects:

[0121] (1) The counterweight 10 can be loaded in place at one time, avoiding loading the counterweight onto the tray 9 multiple times by hoisting.

[0122] (2) The load of the drilling top drive is obtained from the total weight of the lifting ring 2, the first hydraulic elevator clamp 3, the heavy drill pipe 4, the second hydraulic elevator clamp 5, the sling 6, the reading of the electronic tensiometer 8, the distance between the ear rings on both sides of the hydraulic elevator clamp 5, the distance between the lifting points on both sides of the tray 9, the sling 6 connecting both sides of the hydraulic elevator clamp 5 and the tray 9, and the total length composed of the electronic tensiometer 7 and the sling or steel cable 8, and the result is true and reliable.

[0123] (3) All the equipment used is drilling equipment and can be easily obtained at the project construction site.

[0124] (4) The weight of the accessories is known, no additional weighing is required, and the calibration is more accurate.

[0125] (5) Multiple drill pipes can be used to adapt to the moonpool height of different floating drilling platforms and the length of the sling can be reasonably equipped.

[0126] Example 2 is as Figure 5 shown:

[0127] Two lifting rings 2 are connected below the top drive 1 of the floating drilling platform rig. The first hydraulic elevator clamp 3 is connected below the lifting ring 2. The upper part of the heavy drill pipe is locked by the first hydraulic elevator clamp 3, and the lower part of the heavy drill pipe 4 is locked by the second hydraulic elevator clamp 5. The heavy drill pipe 4 passes through the center of the rotary table on the drill floor to reach the moonpool deck surface. The ear rings on both sides of the second hydraulic elevator clamp 5 respectively pass through the sling 6. Electronic tensiometers 7 are respectively connected to the lower ends of the two slings 6. Steel cables or slings 8 respectively pass through the lower parts of the two electronic tensiometers 7, and the lower parts of the two steel cables or slings 8 are connected to the moonpool deck body of the floating drilling platform to ensure that the connection points can bear the maximum load of the top drive.

[0128] The specific experimental steps are as follows:

[0129] 1. Weigh the lifting ring 2, the first hydraulic elevator clamp 3, the heavy drill pipe 4, the second hydraulic elevator clamp 5, and the sling 6, and record the total weight as M.

[0130] 2. Measure the distance between the ear rings on both sides of the hydraulic elevator clamp 5, and record it as X.

[0131] 3. Measure the distance between the two connection points of the sling or steel cable 8 and the moonpool deck body of the floating drilling platform, and record it as Y.

[0132] 4. Measure the total length composed of the sling 6 connecting both sides of the hydraulic elevator clamp 5 and the tray 9, the electronic tensiometer 7, and the sling or steel cable 8, and record it as S.

[0133] 5. Calibration method experimental device for assembling the load of the top drive of the drilling rig;

[0134] 6. Lift the top drive and record the readings of the two electronic tension gauges 8, denoted as F1 and F2 respectively;

[0135] 7. Use the top drive load calculation formula to calculate the load force of the top drive in the current state and conduct calibration based on this.

[0136]

[0137] Where: T is the load of the top drive, in t; M is the total weight of the lifting ring 2, hydraulic elevator one 3, heavy drill pipe 4, hydraulic elevator two 5, and sling 6, in t; g is the acceleration due to gravity, 9.8 m / s 2 ; F1 and F2 are the readings of the two electronic tension gauges respectively, in KN; X is the distance between the ear rings on both sides of the hydraulic elevator 5, in m; Y is the distance between the two connection points of the sling or steel cable 8 and the moonpool deck body of the floating drilling platform, in m; S is the total length composed of the sling 6, electronic tension gauge 7, and sling or steel cable 8 connecting the hydraulic elevator 5 and both sides of the moonpool deck body of the floating drilling platform, in m.

[0138] Example 3, as Figure 7 shown:

[0139] Two lifting rings 2 are connected below the top drive 1 of the floating drilling platform rig. A hydraulic elevator one 3 is connected below the lifting ring 2. The upper part of the heavy drill pipe is locked with the hydraulic elevator one 3. The lower part of the heavy drill pipe 4 is locked with the hydraulic elevator two 5. The heavy drill pipe 4 passes through the center of the rotary table on the drill floor to reach the moonpool deck surface. The ear rings on both sides of the hydraulic elevator two 5 are respectively passed through the sling 6. Electronic tension gauges 7 are respectively connected to the lower ends of the two slings 6. Steel cables or slings 8 are respectively passed through the lower parts of the two electronic tension gauges 7. The lower parts of the two steel cables or slings 8 are connected to the connector 12. The water bag 13 is connected below the connector 12 to ensure that the mass of the water filled in the water bag 13 can meet the maximum load of the top drive.

[0140] The specific experimental steps are as follows:

[0141] 1. Weigh the lifting ring 2, hydraulic elevator one 3, heavy drill pipe 4, hydraulic elevator two 5, and sling 6, and record the total weight as M;

[0142] 2. Assemble the calibration method experimental device for the load of the top drive of the drilling rig;

[0143] 6. Lift the top drive to drive the water bag to rise and record the readings of the two electronic tension gauges 8, denoted as F1 and F2 respectively;

[0144] 7. Use the top drive load calculation formula to calculate the load force of the top drive in the current state and conduct calibration in sequence based on this.

[0145]

[0146] Where: T is the load of the top drive, t; M is the total weight of the lifting ring 2, hydraulic elevator 1 3, weighted drill pipe 4, hydraulic elevator 2 5, and sling 6, t; g is the acceleration of gravity, 9.8m / s 2 ; F1 and F2 are the readings of two electronic dynamometers, KN.

[0147] In summary, the present invention realizes accurate calibration of the top drive load by constructing a symmetrical suspension structure including a rectangular structure and an isosceles trapezoidal structure, and setting an electronic dynamometer for tension measurement. The design of the symmetrical suspension structure enables the suspension to be subjected to uniform force during the lifting process, reducing the measurement error caused by the deflection or shaking of the suspension. At the same time, the high-precision measurement capability of the electronic dynamometer also ensures the accuracy of the tension data, thereby improving the accuracy of the top drive load calibration. Compared with the traditional calibration method, the present method does not require complex mechanical structures and manual measurement steps, and the calibration can be completed through simple lifting operations and dynamometer readings, which greatly simplifies the calibration process and improves work efficiency. The present method is applicable to top drive systems of floating drilling platform rigs of different models and specifications. It only needs to adjust the weight of the suspension structure and the calibration object according to the actual load capacity of the top drive, and has strong versatility and applicability.

[0148] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0150] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0151] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A calibration method for the load of the top drive of a floating drilling rig, characterized in that, It includes the following steps: Construct a symmetric suspension structure below the top drive to be calibrated; the symmetric suspension structure includes a rectangular structure and an isosceles trapezoidal structure; electronic tension meters are arranged on both sides of the symmetric suspension structure; a calibration object is connected below the symmetric suspension structure; Lift the top drive, and read the tension of the electronic tension meter after completing the lifting operation; Based on the tension and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive; Perform load calibration on the top drive based on the load force.

2. The calibration method for the top drive load of a floating drilling rig according to claim 1, wherein The method further includes the following steps: Connect two sling rings on both sides below the top drive; the two sling rings have the same specifications; Connect a first hydraulic elevator clamp below the two sling rings, and successively arrange a heavy drill pipe and a second hydraulic elevator clamp below the first hydraulic elevator clamp; the first hydraulic elevator clamp locks the upper part of the heavy drill pipe, and the second hydraulic elevator clamp locks the lower part of the heavy drill pipe; the heavy drill pipe passes through the center of the rotary table on the drill floor to reach the moon pool deck surface; Connect the symmetric suspension structure based on the second hydraulic elevator clamp.

3. The calibration method for the top drive load of a floating drilling rig according to claim 2, characterized in that, When the symmetric suspension structure is the isosceles trapezoidal structure; constructing the symmetric suspension structure below the top drive to be calibrated includes the following steps: Connect two traction belts to the ear rings on both sides of the second hydraulic elevator clamp; electronic tension meters are arranged at the same position in the middle of the two traction belts; Connect the lower parts of the two traction belts to both ends of the calibration object; the widths of the lower ends of the two traction belts are not equal to the width of the second hydraulic elevator clamp.

4. The calibration method for the top drive load of a floating drilling rig according to claim 3, characterized in that The calibration object includes a tray and a counterweight; connecting the lower parts of the two traction belts to both ends of the calibration object includes the following steps: Connect the lower parts of the two traction belts to both ends of the tray; Transfer the counterweight to above the tray.

5. The calibration method for the top drive load of a floating drilling rig according to claim 3, characterized in that, The calibration object is the moon pool deck body of a floating drilling platform; connecting the lower parts of the two traction belts to both ends of the calibration object includes the following steps: Connect the lower parts of the two traction belts to both sides of the moon pool deck body of the floating drilling platform; Wherein, the angles formed by the two traction belts and the surface of the moon pool deck body of the floating drilling platform are the same.

6. The calibration method for the top drive load of a floating drilling rig according to claim 2, wherein When the symmetric suspension structure is the rectangular structure; constructing the symmetric suspension structure below the top drive to be calibrated includes the following steps: Connect two traction belts to the ear rings on both sides of the second hydraulic elevator clamp; electronic tension meters are arranged at the same position in the middle of the two traction belts; Connect the lower parts of the two traction belts to the calibration object; the widths of the lower ends of the two traction belts are equal to the width of the second hydraulic elevator clamp.

7. The calibration method for the top drive load of a floating drilling rig according to claim 3 or 6, characterized in that, Connecting two traction belts to the ear rings on both sides of the second hydraulic elevator clamp includes the following steps: Connect two first sling belts to the ear rings on both sides of the second hydraulic elevator clamp; Connect the electronic tension meters to the lower ends of the two first sling belts respectively; Connect steel cables or second sling belts below the two electronic tension meters respectively; Form the traction belt according to the sequentially connected first sling belt, the electronic tension meter, and the steel cable or the second sling belt.

8. The calibration method for the top drive load of a floating drilling rig according to claim 6, characterized in that Connecting the two lower ends of the traction belts to the calibration object includes the following steps: Connect the lower ends of the two traction belts to a connector; the width of the connector is equal to the width of the second hydraulic elevator clamp; Connect a water bag below the connector.

9. The calibration method for the top drive load of a floating drilling rig according to claim 1, characterized in that, When the symmetric suspension structure is the rectangular structure; based on the pulling force and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive, including the following steps: Obtain the load force of the top drive according to the sum of the equivalent weights of the pulling forces of the two electronic tensiometers and the weight of the symmetric suspension structure; Wherein, the expression of the load force is: In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the pulling forces of the two electronic tensiometers; g represents the acceleration due to gravity.

10. The calibration method for the top drive load of a floating drilling rig according to claim 1, characterized in that, When the symmetric suspension structure is the isosceles trapezoid structure; based on the pulling force and the weight of the symmetric suspension structure, perform top drive load analysis through the equivalent mathematical model of the symmetric suspension structure to obtain the load force of the top drive, including the following steps: Obtain the side lengths of the isosceles trapezoid structure; the side lengths include the upper side length, the lower side length, and the waist length; Based on the pulling force and the weight of the symmetric suspension structure, combine the side lengths of the isosceles trapezoid structure to perform top drive load analysis to obtain the load force of the top drive; Wherein, the expression of the load force is: In the formula, T represents the load force; M represents the weight of the symmetric suspension structure; F1 and F2 represent the pulling forces of the two electronic tensiometers; g represents the acceleration due to gravity; S represents the waist length; X represents the upper side length; Y represents the lower side length.

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