A weighing sensor special for petroleum drilling and production

Abstract

The utility model belongs to sensor technical field discloses a kind of weighing sensors special for petroleum drilling and production, including by top to bottom coaxial arrangement top connecting piece, force-bearing framework, elastomer and bottom connecting piece;Force-bearing framework is cylindrical structure, and the middle part of force-bearing framework has integrally-formed annular boss, elastomer is sleeved in force-bearing framework outside;The middle part sidewall of elastomer is thinned to form annular thin-walled area, thin-walled area constitutes shear beam type inductor, and its surface is attached with strain gauge group, the bottom outer edge of elastomer is fixedly connected with bottom connecting piece;It also includes force transmission ring and sealing component, force transmission ring is arranged between elastomer and force-bearing framework;Sealing component includes first sealing part and second sealing part.The utility model is through the cooperation of shear beam type inductor, self-aligning spherical washer and mechanical overload protection structure, both improve the sensitivity to suspended load, and also solve the problem of sensor failure caused by violent impact and vibration in drilling and production operation.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a weighing sensor specifically for oil drilling and production. Background Technology

[0002] In oil drilling operations, it is crucial to measure the suspended weight of the drill string or tubing at the wellhead in real time and accurately. This parameter is directly related to drilling safety, efficiency, and equipment life. Currently, there are two main types of weighing sensors used in this scenario: one is a resistance strain gauge sensor that is directly installed on the dead rope anchor or overhead crane, and the other is to indirectly calculate the suspended weight by measuring the pressure of the hydraulic hook through a pressure sensor.

[0003] Although resistance strain gauge sensors have high measurement accuracy, their core sensitive element, the strain gauge, is directly exposed to harsh working conditions, resulting in problems such as impact vibration and poor sealing. Specifically, the severe impact and continuous vibration generated during drilling operations can easily lead to strain gauge fatigue damage, weld cracking, or signal drift. Furthermore, in long-term outdoor and corrosive environments, if the sensor's seal fails, moisture or media intrusion will directly render the sensor unusable. Therefore, we propose a weighing sensor specifically for oil drilling and production. Utility Model Content

[0004] In view of the problems of impact vibration and poor sealing in the existing sensors, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A weighing sensor for oil drilling and production includes a top connector, a load-bearing frame, an elastic body, and a bottom connector arranged coaxially from top to bottom.

[0007] The load-bearing frame is a cylindrical structure, and the middle part of the load-bearing frame has an integrally formed annular boss. The elastic body is sleeved on the outside of the load-bearing frame, and a first radial gap is left between the top of the elastic body and the lower surface of the annular boss.

[0008] The middle sidewall of the elastomer is thinned to form an annular thin-walled region, which constitutes a shear beam inductor, and a strain gauge assembly is attached to its surface. The bottom outer edge of the elastomer is fixedly connected to the bottom connector.

[0009] It also includes a force transmission ring and a sealing component. The force transmission ring is disposed between the elastic body and the load-bearing frame. The upper end face of the force transmission ring contacts the lower surface of the annular boss, and its lower end face contacts the elastic body through a spherical washer.

[0010] The sealing component includes a first sealing portion disposed between the top connector and the load-bearing frame, and a second sealing portion disposed between the elastomer and the bottom connector.

[0011] As a technical solution of the oil drilling and production-specific weighing sensor described in this utility model, the top connector and the bottom connector are both provided with pin holes for connecting with drilling and production equipment.

[0012] As a technical solution for a weighing sensor for oil drilling and production as described in this utility model, the top connector and the load-bearing frame are connected by threads and locked by fasteners.

[0013] As a technical solution of the oil drilling and production-specific weighing sensor described in this utility model, the spherical washer is a self-aligning spherical washer.

[0014] As a technical solution of the oil drilling and production-specific weighing sensor of this utility model, wherein: an anti-collision ring is sleeved on the outer side of the thin-walled region of the elastomer, and a second radial gap is left between the anti-collision ring and the thin-walled region.

[0015] As a technical solution of the oil drilling and production-specific weighing sensor of this utility model, it further includes a protective shell, which covers the outside of the elastomer and the anti-collision ring and is fixedly connected to the bottom connector.

[0016] As a technical solution of the oil drilling and production-specific weighing sensor described in this utility model, the annular boss can contact the upper end face of the bottom connector when an overload occurs, forming a mechanical overload protection structure.

[0017] As a technical solution of the oil drilling and production-specific weighing sensor of this utility model, the elastic body, the bottom connector and the second sealing part constitute a sealed chamber, and the strain gauge group and the circuit elements connected thereto are sealed in the sealed chamber.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. This utility model, through the synergy of a shear beam sensor, a self-aligning spherical washer, and a mechanical overload protection structure, not only improves the sensitivity to suspended loads but also solves the problem of sensor failure caused by severe impacts and vibrations during drilling and production operations.

[0020] 2. This utility model forms a multi-layer protection through a double sealing structure, anti-collision ring and protective shell, which can effectively resist corrosive media, mechanical collisions and environmental interference, and can significantly extend the service life of the sensor under harsh outdoor conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0024] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0025] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B.

[0026] Explanation of reference numerals in the attached figures:

[0027] In the figure: 1. Top connector; 2. Load-bearing frame; 201. Annular boss; 3. Force transmission ring; 4. Spherical washer; 5. Elastomer; 501. Thin-walled area; 6. Bottom connector; 7. Protective shell; 8. Anti-collision ring; 901. First sealing part; 902. Second sealing part; 10. Fastener; 11. Strain gauge assembly; 12. Pin hole. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1-4 A weighing sensor for oil drilling and production is provided. This weighing sensor for oil drilling and production includes a top connector 1, a load-bearing frame 2, an elastic body 5 and a bottom connector 6 arranged coaxially from top to bottom.

[0030] The load-bearing frame 2 is a cylindrical structure, and the middle part of the load-bearing frame 2 has an integrally formed annular boss 201. The elastic body 5 is sleeved on the outside of the load-bearing frame 2, and a first radial gap of 2-3mm is left between the top of the elastic body 5 and the lower surface of the annular boss 201. In application, the force transmission path is optimized by the separate design of the load-bearing frame 2 and the elastic body 5.

[0031] The middle sidewall of the elastic body 5 is thinned to form an annular thin-walled region 501. The thin-walled region 501 constitutes a shear beam inductor, and a strain gauge assembly 11 is attached to its surface. The bottom outer edge of the elastic body 5 is fixedly connected to the bottom connector 6. In application, the thin-walled region 501 of the elastic body 5 forms a shear beam inductor. Combined with the strain gauge assembly 11, it can enhance the sensitivity to suspended loads.

[0032] It also includes a force transmission ring 3 and a sealing component. The force transmission ring 3 is disposed between the elastic body 5 and the load-bearing frame 2. The upper end face of the force transmission ring 3 contacts the lower surface of the annular boss 201, and its lower end face contacts the elastic body 5 through the spherical washer 4. In application, the annular boss 201 and the force transmission ring 3 cooperate to reduce stress concentration and improve measurement accuracy.

[0033] The sealing component includes a first sealing part 901 (such as an O-ring) disposed between the top connector 1 and the load-bearing frame 2 and a second sealing part 902 (such as a metal spiral wound gasket) disposed between the elastomer 5 and the bottom connector 6. In application, the dual sealing design of the first sealing part 901 and the second sealing part 902 effectively isolates external corrosive media (such as mud and water vapor) and extends the service life of the sensor.

[0034] Reference Figure 1 and Figure 2 Both the top connector 1 and the bottom connector 6 are provided with pin holes 12 for connecting to drilling and production equipment. In application, the design of the pin holes 12 of the top connector 1 and the bottom connector 6 facilitates quick installation and disassembly, and adapts to the needs of frequent adjustment of the working conditions of drilling and production equipment.

[0035] Reference Figure 2 and Figure 3 The top connector 1 and the load-bearing frame 2 are connected by threads and locked by fasteners 10. In application, the combined locking method of threaded connection and fasteners 10 enhances structural stability and prevents loosening failure caused by vibration.

[0036] Reference Figure 2 and Figure 4 The spherical washer 4 is a self-aligning spherical washer. The elastomer 5 forms a floating connection with the force transmission ring 3 through the self-aligning spherical washer 4, eliminating the installation off-center load stress. In application, the self-aligning spherical washer 4 can automatically compensate for the installation off-center load or non-axial force, reduce measurement error, and improve the resistance to off-center load.

[0037] Reference Figure 2 and Figure 4An anti-collision ring 8 is fitted around the thin-walled region 501 of the elastomer 5. A second radial gap is left between the anti-collision ring 8 and the thin-walled region 501. The second radial gap is controlled within 0.5-1mm. It also includes a protective shell 7, which covers the outside of the elastomer 5 and the anti-collision ring 8 and is fixedly connected to the bottom connector 6. In application, the anti-collision ring 8 and the protective shell 7 constitute double mechanical protection to prevent the thin-walled region 501 from being damaged by drill string collision or splashed rock. At the same time, the protective shell 7 can further isolate external environmental interference.

[0038] Reference Figure 2 and Figure 4 When an overload occurs, the annular boss 201 can contact the upper surface of the bottom connector 6 to form a mechanical overload protection structure. When the load exceeds 120% of the rated value, it makes direct mechanical contact to avoid plastic deformation of the thin-walled area 501. In application, the mechanical overload protection structure of the annular boss 201 and the bottom connector 6 directly transmits the load when overloaded, preventing the elastic body 5 and the strain gauge assembly 11 from being damaged due to overload.

[0039] Reference Figure 2 and Figure 4 The elastic body 5, the bottom connector 6, and the second sealing part 902 constitute a sealed chamber. The strain gauge assembly 11 and the circuit elements connected to it are sealed in the sealed chamber. The strain gauge assembly 11 adopts a full-bridge circuit and is attached to the thin-walled area 501. The signal line is led out through the sealed chamber to the junction box inside the protective housing 7 and filled with epoxy resin for moisture protection. In application, the design of the sealed chamber completely seals the strain gauge assembly 11 and the circuit elements to prevent moisture or corrosive media from entering and to ensure the reliability of the sensor in extreme environments.

[0040] The working principle of this utility model is as follows: Installation stage operation: The top connector 1 and the bottom connector 6 are connected to the derrick base and the dead rope fixing pin through the pin hole 12, and then the fastener 10 is tightened. The spherical washer 4 is used to automatically compensate for the installation angle deviation.

[0041] During the operation monitoring phase: the load transfer path is from the drill string suspended to the top connector 1, from the top connector 1 to the load-bearing frame 2, from the load-bearing frame 2 to the force transmission ring 3, from the force transmission ring 3 to the thin-walled region 501 of the elastic body 5, and finally the strain gauge group 11 outputs an electrical signal. During this period, when overloaded, the annular boss 201 contacts the bottom connector 6, and the force flow bypasses the thin-walled region 501.

[0042] Maintenance phase: Regularly check the gap between the anti-collision ring 8 and the thin-walled area 501, and the leakage of the first sealing part 901 and the second sealing part 902. If a violent drilling impact occurs, the sensor zero point needs to be recalibrated.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A weighing sensor specifically for oil drilling and production, characterized in that: It includes a top connector (1), a load-bearing frame (2), an elastomer (5), and a bottom connector (6) arranged coaxially from top to bottom; The load-bearing frame (2) is a cylindrical structure, and the middle part of the load-bearing frame (2) has an integrally formed annular boss (201). The elastic body (5) is sleeved on the outside of the load-bearing frame (2), and a first radial gap is left between the top of the elastic body (5) and the lower surface of the annular boss (201). The middle sidewall of the elastic body (5) is thinned to form an annular thin-walled region (501). The thin-walled region (501) constitutes a shear beam inductor, and a strain gauge assembly (11) is attached to its surface. The bottom outer edge of the elastic body (5) is fixedly connected to the bottom connector (6). It also includes a force transmission ring (3) and a sealing component. The force transmission ring (3) is disposed between the elastic body (5) and the load-bearing frame (2). The upper end face of the force transmission ring (3) is in contact with the lower surface of the annular boss (201), and its lower end face is in contact with the elastic body (5) through a spherical washer (4). The sealing component includes a first sealing part (901) disposed between the top connector (1) and the load-bearing frame (2) and a second sealing part (902) disposed between the elastomer (5) and the bottom connector (6).

2. The weighing sensor for oil drilling and production according to claim 1, characterized in that: Both the top connector (1) and the bottom connector (6) are provided with pin holes (12) for connecting to drilling equipment.

3. The weighing sensor for oil drilling and production according to claim 1, characterized in that: The top connector (1) and the load-bearing frame (2) are connected by threads and locked by fasteners (10).

4. The weighing sensor for oil drilling and production according to claim 1, characterized in that: The spherical washer (4) is a self-aligning spherical washer.

5. The weighing sensor for oil drilling and production according to claim 1, characterized in that: An anti-collision ring (8) is fitted on the outside of the thin-walled region (501) of the elastomer (5), and a second radial gap is left between the anti-collision ring (8) and the thin-walled region (501).

6. The weighing sensor for oil drilling and production according to claim 5, characterized in that: It also includes a protective shell (7), which covers the outside of the elastomer (5) and the anti-collision ring (8) and is fixedly connected to the bottom connector (6).

7. The weighing sensor for oil drilling and production according to claim 1, characterized in that: The annular boss (201) can contact the upper surface of the bottom connector (6) when an overload occurs, forming a mechanical overload protection structure.

8. The weighing sensor for oil drilling and production according to claim 1, characterized in that: The elastomer (5), the bottom connector (6), and the second sealing part (902) constitute a sealed chamber, and the strain gauge assembly (11) and the circuit elements connected thereto are sealed in the sealed chamber.

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