A wireless hanging weight instrument for calibrating weight indicators

Abstract

The present invention relates to a wireless hanging weight meter for calibrating a weight indicator, comprising a main housing, a drill rod connector and a drill bit connector, wherein the drill rod connector and the drill bit connector are symmetrically arranged at the upper and lower ends of the main housing, a force transmission column located between the main housing is further installed between the drill rod connector and the drill bit connector, a stress plate is provided on the outer wall of the force transmission column, and a stress acquisition and analysis controller is further installed in the main housing. The beneficial effects of the present invention are as follows: the drill rod and the drill bit are respectively connected by the drill rod connector and the drill bit connector, and during operation, the force transmission column is deformed due to the stress transmitted by the drill rod connector and the drill bit connector, the deformation size is fed back through the stress plate, and the corresponding hanging weight value is analyzed by the stress acquisition and analysis controller for online comparison with the weight indicator to cooperate with the calibration process of the weight indicator, without the need to disassemble the weight indicator to the laboratory for testing, which greatly reduces the calibration time.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, in particular to a wireless suspended weight instrument used for calibrating a weight indicator. Background Art

[0002] Oil drilling weight indicators are specialized measuring instruments used to monitor downhole pressure fluctuations, drill bit sticking, and other abnormalities in real time during oil and gas drilling. They are primarily used to measure the hanging weight of drill tools and the weight on bit (WOB), as well as their fluctuations. Based on these values ​​and fluctuations, the operating conditions of the drill bit and drill string can be monitored, guiding drilling and salvage operations, and addressing complex downhole situations.

[0003] During the drilling process, if the weight gauge's indication accuracy deviates, it's easy to continue following the incorrect instructions, leading to persistent stuck pipe accidents. According to the calibration method for weight gauges used in oil drilling and workovers, the gauge must be disassembled and recalibrated in the laboratory. This requires a long calibration cycle and is relatively cumbersome to transport. Summary of the Invention

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a wireless hanging weight instrument for calibrating a weight indicator to solve the problem of cumbersome calibration of the weight indicator.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a wireless hanging weight meter for calibrating a weight indicator, comprising a main shell, a drill rod connector and a drill bit connector, the drill rod connector and the drill bit connector being symmetrically arranged at the upper and lower ends of the main shell, a force transmission column located between the main shells is also installed between the drill rod connector and the drill bit connector, a stress plate is provided on the outer wall of the force transmission column, and a stress acquisition and analysis controller is also installed in the main shell.

[0006] The beneficial effects of the present invention are as follows: the drill rod and the drill bit are respectively connected by the drill rod connector and the drill bit connector. During operation, the drill rod connector and the drill bit connector transmit stress, causing the force transmission column to deform. The deformation size is fed back through the stress sheet, and the stress acquisition and analysis controller is used to analyze the corresponding suspended weight value for online comparison with the weight indicator to cooperate with the calibration process of the weight indicator. There is no need to disassemble the weight indicator to the laboratory for testing, which greatly reduces the calibration time.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, thread grooves for fixing the drill rod and the drill bit are sequentially formed at the ends of the drill rod connecting piece and the drill bit connecting piece.

[0009] Furthermore, a plurality of stress plates are provided, and the plurality of stress plates are evenly distributed along the circumference of the force transmission column.

[0010] Furthermore, both ends of the force transmission column are provided with connecting parts, and the ends of the drill rod connector and the drill bit connector close to the force transmission column are provided with force transmission terminals, and the force transmission terminals are connected to the connecting parts through bolts.

[0011] Furthermore, the main shell is assembled from a cylinder, an upper cover and a lower cover, and the drill rod connector and the drill bit connector are respectively installed on the upper cover and the lower cover.

[0012] Furthermore, the outside of the drill rod connector is respectively provided with a first limiting ring and a first fixing screw disk that fit with the inner and outer side walls of the upper cover, and the outside of the drill rod connector is provided with a thread that fits with the first fixing screw disk;

[0013] The outside of the drill bit connector is respectively provided with a second limiting ring and a second fixing screw disk that fit with the inner and outer side walls of the lower cover. The outside of the drill bit connector is provided with a thread that matches the second fixing screw disk.

[0014] Furthermore, the inner wall of the upper cover is provided with a step fixing portion, the cylinder is provided with a bearing portion corresponding to the step fixing portion, and the upper cover is provided with a bolt that passes through the step fixing portion and is connected to the bearing portion.

[0015] Furthermore, sealing grooves are provided on the top and bottom edges of the cylinder, and sealing rings corresponding to the sealing grooves are provided on the inner walls of the upper cover and the lower cover, and sealing gaskets are also provided in the sealing grooves.

[0016] Furthermore, the stress acquisition and analysis controller is formed by converting an acquisition module and a power supply module, and the acquisition point of the acquisition module is set on the stress sheet.

[0017] Furthermore, a power supply fixing shell is provided on the outer wall of the main shell, and a sealing cover is installed on the power supply fixing shell.

[0018] The above further solution has the beneficial effect of using the force transmission terminal to fix the connection part, so that the force transmission column can be replaced in time. The sealing groove and sealing ring can be used to reduce the gap between the upper and lower covers and the cylinder, ensuring that liquid will not penetrate into the cylinder in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 It is a structural schematic diagram of the drill pipe connecting piece of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the drill bit connecting piece of the present invention;

[0024] Figure 6 It is a top view of the main shell of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Drill pipe connecting piece, 101. First limiting ring, 102. First fixing screw disk, 2. Drill bit connecting piece, 201. Second limiting ring, 202. Second fixing screw disk, 3. Force transmission column, 31. Connecting part, 32. Force transmission terminal, 4. Stress sheet, 5. Stress acquisition and analysis controller, 6. Cylinder, 6a. Sealing groove, 61. Upper cover, 62. Lower cover, 63. Ladder fixing part, 64. Bearing part, 65. Sealing ring, 7. Power supply fixing shell, 71. Sealing cover. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] The oil drilling weight indicator is a specialized measuring instrument used for oil and gas drilling. It provides real-time monitoring of downhole pressure fluctuations, drill bit sticking, and other abnormalities during oil and gas drilling. It is essential for technicians to analyze downhole conditions and a crucial instrument for drillers to observe downhole conditions. The indicator is primarily used to measure the hanging weight of drill tools and the weight on bit (WOB), as well as their fluctuations. This information provides insights into the performance of the drill bit and drill string, guiding drilling and salvage operations, and addressing complex downhole situations.

[0029] Drilling weight indicators can be categorized by their operating principle into two main types: hydraulic and electronic. Hydraulic weight indicators are currently the most commonly used. Among these hydraulic weight indicators, the Japanese W series, the Chinese JZ and MZ series, and the American FS series offer superior performance and are widely used. The W series has been replaced by the Chinese JZ (Zhejiang Zhongheng, Hubei Jianghan) and MZ series. The American FS series is rarely used.

[0030] The drilling weight gauge plays a crucial role in the drilling process. For example, a stuck pipe incident occurred in one well, resulting in a drill bit stuck for two days. Inspection of the gauge revealed significant displacement, discrepancies between the suspended weight and the sensitive needle and the actual weight, and oil leakage from the sensor rubber diaphragm. These factors had caused the driller to operate according to the incorrect indication, preventing the drill bit from being released. Therefore, efficient and accurate calibration of the gauge is crucial for reducing safety hazards, preventing blowouts, and optimizing parameters.

[0031] According to the SY / T7075-2016 oil drilling and workover gauge calibration method, the calibration interval for gauges should be determined based on actual usage, with a recommended interval of no more than 12 months. However, the reality is that when calibration is due, the gauge may not be calibrated in time due to various factors, such as long distances, difficulty in disassembly, and inconvenient transportation. Currently, calibration of gauges in China is primarily performed in the laboratory. First, the gauge undergoes a visual inspection to ensure the clarity and integrity of components and scales. The dead-end sensor and secondary display are then disassembled for calibration of specific parameters, including basic error, sensitivity, tapping variation, return error, and seal performance. Due to the harsh wellsite environment, frequent disassembly and handling inevitably affect the gauge's accuracy, and thus the accuracy of the calibration results. In recent years, due to the unique characteristics of well crew operations, such as the urgent need for gauge installation during field operations and the significant impact of frequent disassembly on gauge performance, the demand for on-site calibration of gauges has become increasingly urgent.

[0032] For a long time, the challenge of calibrating a weight gauge without sending it to a laboratory has plagued construction teams. Drilling teams typically work in remote, remote areas, and calibrating a weight gauge can be time-consuming and difficult. Furthermore, the drilling rig must be stopped during inspection, hindering construction progress and creating numerous safety hazards. Therefore, the development of an online weight gauge calibration method is crucial. This method, which allows for accurate and convenient on-site calibration without disrupting on-site operations, significantly improves work efficiency, reduces workload, and shortens downtime for drilling teams, a crucial practical requirement.

[0033] The current calibration method, SY / T 7075-2016, "Calibration Method for Weight Indicators for Petroleum Drilling and Workover," specifies laboratory calibration procedures for dead-line sensors and weight indicators. Sinopec has yet to successfully test its on-site weight indicator system. In recent years, experts have pointed out that online testing of weight indicator systems should include testing the secondary weight indicator, the dead-line anchor, and the pulleys of the entire suspension system. However, current testing equipment is unable to calculate the dead-line anchor value and the friction value of the pulleys of the entire suspension system. Testing the dead-line anchor and the pulleys of the entire suspension system requires testing the dead-line tension, which is measured by the dead-line tension. However, according to research and relevant data, the world's most advanced tension force gauges are developed in the United States and have a maximum accuracy of approximately 2%. The accuracy of secondary weight indicators is currently 1%, which does not meet the traceability requirements. Therefore, this method cannot meet the requirements for online testing. Although the dead rope holder and the suspension system have an impact on the online detection of the weight indicator, after years of on-site experience, it has been determined that the impact of their errors on the rectification of the weight indicator system can be ignored. The online calibration of the oil drilling weight indicator mainly calibrates the secondary weight indicator. Although we cannot calculate the value of the dead rope holder and the friction value of the pulley of the entire suspension system, we can still perform online calibration of the weight indicator. We first calibrate the secondary weight indicator as the main calibration basis, and then calculate the sum of the value of the dead rope holder and the friction value of the pulley of the entire suspension system. Based on the sum of the value of the dead rope holder and the friction value of the pulley of the entire suspension system, we use it as a reference to jointly perform online calibration of the weight indicator. To this end, the present invention provides a wireless hanging weight instrument for calibrating the weight indicator, which is used to connect the drill pipe and the drill bit and obtain the hanging weight value between them for comparison with the value displayed on the weight indicator, so as to complete online detection to cooperate with the calibration of the weight indicator.

[0034] The present invention provides the following preferred embodiments

[0035] Example 1

[0036] like Figure 1 、 Figure 2As shown, a wireless hanging weight meter for calibrating a weight indicator is characterized by including a main housing, a drill rod connector 1, and a drill bit connector 2. The drill rod connector 1 and the drill bit connector 2 are symmetrically arranged at the upper and lower ends of the main housing. The ends of the drill rod connector 1 and the drill bit connector 2 are respectively provided with threaded grooves for fixing the drill rod and the drill bit. A force transmission column 3 is also installed between the drill rod connector 1 and the drill bit connector 2, and the outer wall of the force transmission column 3 is provided with a stress plate 4. A stress acquisition and analysis controller 5 is also installed in the main housing. The drill rod connector 1 and the drill bit connector 2 are respectively connected to the drill rod and the drill bit. During operation, the drill rod connector 1 and the drill bit connector 2 transmit stress, causing the force transmission column 3 to deform. The deformation size is fed back through the stress plate 4, and the stress acquisition and analysis controller 5 is used to analyze the corresponding hanging weight value for online comparison with the weight indicator. This calibration process requires multi-point addition and subtraction to improve calibration accuracy.

[0037] It should be noted that the stress acquisition and analysis controller 5 can utilize the TST5923 wireless remote stress and strain test analysis controller, which primarily consists of an acquisition module and a power module. During testing, the acquisition module collects strain data from the stress gauge 4. This data can be transmitted over a distance of greater than 30 meters using Wi-Fi wireless transmission technology, enabling remote online value detection to facilitate calibration of the indicator. This eliminates the need to dismantle the indicator for testing in a laboratory, significantly reducing calibration time.

[0038] Furthermore, a plurality of stress sheets 4 are provided, and the plurality of stress sheets 4 are evenly distributed along the circumference of the force transmission column 3 , and each stress sheet 4 is configured with a collection module to increase the reliability of the detection.

[0039] The outer wall of the main shell is also provided with a power supply fixed shell 7, and a sealing cover 71 is also installed on the power supply fixed shell 7. A mobile power supply is provided in the power supply fixed shell 7 to provide the power required for the operation of the stress acquisition and analysis controller 5. The sealing cover 71 is removed for replacement to ensure normal operation.

[0040] Example 2

[0041] In this embodiment, Figure 2 As shown, in order to facilitate the regular replacement of the force transmission column 3, connecting parts 31 are provided at both ends of the force transmission column 3, and force transmission terminals 32 are provided at one end of the drill rod connector 1 and the drill bit connector 2 close to the force transmission column 3. The force transmission terminal 32 is connected to the connecting part 31 by a bolt. The connecting part 31 is fixed by using the force transmission terminal 32 to facilitate timely replacement of the force transmission column 3.

[0042] Example 3

[0043] The difference between this embodiment and the above embodiment is that Figure 2As shown, the main housing is assembled from a cylinder 6, an upper cover 61 and a lower cover 62, and the drill rod connector 1 and the drill bit connector 2 are respectively mounted on the upper cover 61 and the lower cover 62.

[0044] like Figure 4 As shown, the outside of the drill rod connector 1 is provided with a first retaining ring 101 and a first fixing screw disk 102, which respectively fit the inner and outer side walls of the upper cover 61. The drill rod connector 1 is provided with a thread on the outside that matches the first fixing screw disk 102. The upper cover 61 is clamped together by the first fixing screw disk 102 and the first retaining ring 101 to achieve locking of the drill rod connector 1 and the upper cover 61.

[0045] like Figure 5 As shown, the drill bit connector 2 is provided with a second retaining ring 201 and a second fixing screw disk 202 on the outside, respectively, which fit against the inner and outer side walls of the lower cover 62. The drill bit connector 2 is provided with threads on the outside that match the second fixing screw disk 202. The second fixing screw disk 202 and the second retaining ring 201 clamp the lower cover 62 to achieve locking of the drill bit connector 2 and the lower cover 62.

[0046] Further, if Figure 3 As shown, to ensure the sealing of the main housing, the inner wall of the upper cover 61 is further provided with a step-fixing portion 63. A bearing portion 64 corresponding to the step-fixing portion 63 is provided within the cylinder 6. Bolts are inserted through the upper cover 61, penetrating the step-fixing portion 63 and connecting to the bearing portion 64. Multiple step-fixing portions 63 and bearing portions 64 are arranged within the upper cover 61 and the cylinder 6, and are locked together by bolts to ensure a relatively tight connection between the upper cover 61 and the cylinder 6. Furthermore, the lower cover 62 has the same structure and connection method as the upper cover 61, so this will not be described in detail.

[0047] Such as 3 and Figure 6 As shown, sealing grooves 6a are provided on the top and bottom edges of the cylinder 6, and sealing rings 65 corresponding to the sealing grooves 6a are provided on the inner walls of the upper cover 61 and the lower cover 62. A sealing gasket is also provided in the sealing groove 6a. The sealing gasket can be made of rubber, which can reduce the gap between the upper cover 61 and the lower cover 62 and the cylinder 6 to ensure that no liquid will penetrate into the cylinder 6 in a humid environment.

[0048] The beneficial effects of the present invention are specifically embodied in the above which are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wireless hanging weight meter for calibrating a weight indicator, characterized in that: The invention comprises a main housing, a drill rod connector (1) and a drill bit connector (2), wherein the drill rod connector (1) and the drill bit connector (2) are symmetrically arranged at the upper and lower ends of the main housing, a force transmission column (3) located between the main housing is further installed between the drill rod connector (1) and the drill bit connector (2), the outer wall of the force transmission column (3) is provided with a stress sheet (4), and a stress acquisition and analysis controller (5) is further installed in the main housing; thread grooves for fixing the drill rod and the drill bit are sequentially opened at the ends of the drill rod connector (1) and the drill bit connector (2); a plurality of stress sheets (4) are provided, and the plurality of stress sheets (4) are evenly distributed along the circumference of the force transmission column (3); a connecting portion (31) is provided at both ends of the force transmission column (3), and a force transmission terminal (32) is provided at one end of the drill rod connector (1) and the drill bit connector (2) close to the force transmission column (3), and the force transmission terminal (32) is connected to the connecting portion (31) by a bolt.

2. The wireless hanging weight meter for calibrating a weight indicator according to claim 1, characterized in that: The main housing is assembled from a cylinder (6), an upper cover (61) and a lower cover (62); the drill rod connector (1) and the drill bit connector (2) are respectively mounted on the upper cover (61) and the lower cover (62).

3. The wireless hanging weight meter for calibrating a weight indicator according to claim 2, characterized in that: The outside of the drill rod connector (1) is provided with a first limiting ring (101) and a first fixing screw disk (102) respectively fitted with the inner and outer side walls of the upper cover (61), and the outside of the drill rod connector (1) is provided with a thread adapted to the first fixing screw disk (102); The outside of the drill bit connector (2) is provided with a second limiting ring (201) and a second fixing screw disk (202) respectively fitted with the inner and outer side walls of the lower cover (62), and the outside of the drill bit connector (2) is provided with a thread adapted to the second fixing screw disk (202).

4. The wireless hanging weight instrument for calibrating a weight indicator according to claim 3, characterized in that: The inner wall of the upper cover (61) is further provided with a step fixing portion (63), the cylinder (6) is provided with a bearing portion (64) corresponding to the step fixing portion (63), and a bolt is inserted into the upper cover (61) and passes through the step fixing portion (63) and is connected to the bearing portion (64).

5. The wireless hanging weight instrument for calibrating a weight indicator according to claim 4, characterized in that: The top and bottom edges of the cylinder (6) are both provided with sealing grooves (6a), and the inner walls of the upper cover (61) and the lower cover (62) are both provided with sealing rings (65) corresponding to the sealing grooves (6a), and a sealing gasket is also provided in the sealing grooves (6a).

6. The wireless hanging weight instrument for calibrating a weight indicator according to any one of claims 1 to 5, characterized in that: The stress acquisition and analysis controller (5) is formed by converting an acquisition module and a power supply module, and the acquisition point of the acquisition module is arranged on the stress sheet (4).

7. The wireless hanging weight meter for calibrating a weight indicator according to claim 6, characterized in that: The outer wall of the main housing is further provided with a power supply fixing shell (7), and a sealing cover (71) is further installed on the power supply fixing shell (7).

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