Protective device for preventing logging electrode from falling into well

Abstract

A well logging electrode anti-falling protection device belongs to the technical field of oil field production safety protection and comprises two rubber pier components with split structures, each rubber pier component further comprises a clamping plate, a structural sleeve and a rubber block, each clamping plate is a semi-circular plate body, an arc-shaped flange is arranged on the inner side arc surface of each clamping plate, and the rubber blocks are arranged on the structural sleeves. The arc radius of the outer side arc face is larger than the radius of an inner hole of an oil well mouth, the structural sleeve is a semi-arc-shaped sleeve tile and is perpendicularly and coaxially arranged with the plate face of the clamping plate to be fixedly connected to the lower end of the clamping plate, and the rubber body is a semi-ring-shaped body and is bonded and laid on the plate face of the lower end of the clamping plate with the structural sleeve as a rigid structural framework. A connecting lock catch mechanism is arranged on each rubber pier component, the two rubber pier components are connected with each other and can be combined to form a buffer rubber pier, the buffer rubber pier is hung on a logging electrode in a sleeving mode when the logging electrode partially goes out of a well during logging operation, well falling protection is carried out on possible accidental falling accidents of the logging electrode, a safety protection link is additionally arranged, and the safety of the logging electrode is improved. And a protection gradient is added to protect the logging instrument and reduce the production loss.

Description

Technical Field

[0001] This utility model relates to the field of oilfield production safety protection technology, specifically to a logging electrode anti-fall protection device. Background Technology

[0002] Spontaneous potential logging is an important technique in oilfield production for obtaining information on the structure of downhole reservoirs or geological parameters of producing formations. The basic principle involves using an electrode system consisting of downhole measuring electrodes and surface reference electrodes, connected by a cable to form a closed loop to measure the potential difference between the formation and the surface. During the measurement process, the downhole measuring electrodes are lowered into the well by a cable-driven winch for mobile measurement. After logging is complete, they are lifted out of the well by cable. Due to technological constraints, most types of downhole measuring electrodes are very long, some even exceeding 25 meters. They also require accompanying logging instruments to form an instrument string, making the process of retrieving the electrodes from the well quite time-consuming. During the lifting process, if the electrodes and accompanying instruments are partially removed from the well and accidentally detach from the traction cable due to natural factors at the well site, wellhead environmental conditions, or human error, the electrodes and instruments may fall back into the well, causing a serious production accident. This not only easily damages the logging instruments but also generates significant manpower waste during the retrieval of long electrodes. To prevent the logging electrode from accidentally detaching from the traction cable and falling into the well, and to avoid costs and economic losses, existing technologies, while disclosing measures to improve cable connection reliability, strengthen logging operation standards, and enhance workers' safety awareness, do not disclose technical protection measures to prevent the logging electrode from slipping and falling into the well after accidental detachment. Therefore, to enrich and improve the safety measures for spontaneous potential logging and enhance the safety of logging operations, it is necessary to research and develop wellhead protection devices to prevent logging electrodes from falling into the well and improve the reliability of logging safety protection. Utility Model Content

[0003] The purpose of this invention is to provide a logging electrode anti-fall protection device to prevent the logging electrode and its associated instruments from accidentally falling back into the oil well during the process of entering and partially exiting the well and being hoisted out of the well. This protects the logging instruments and reduces economic losses in production.

[0004] A well logging electrode anti-fall protection device includes: two split-structure rubber block components; each rubber block component further includes: a snap-fit ​​plate, a structural sleeve, and a rubber block. The snap-fit ​​plate is a semi-circular annular plate, and the two snap-fit ​​plates can be combined to form a circular structure. The radius of the arc of the inner arc surface of the snap-fit ​​plate corresponds to the radius of the arc of the outer circumference of the well logging electrode, and an inwardly extending arc-shaped flange is provided on the inner arc surface. The arc-shaped flange corresponds to and can be fitted into the annular chuck groove structure opened on the outer circumference of the well logging electrode. The radius of the arc of the outer arc surface of the snap-fit ​​plate is larger than the inner diameter of the wellhead. The structural sleeve is a semi-circular arc-shaped sleeve, and the two structural sleeves can be combined to form a cylindrical structure. The structural sleeves are respectively arranged perpendicularly and coaxially with the surface of the snap-fit ​​plate and fixedly connected to the snap-fit ​​plate. On the lower end plate, the rubber body is a semi-annular body corresponding to the snap-fit ​​plate structure. Using the structural sleeve as a rigid structural skeleton, it is bonded to the lower end plate of the snap-fit ​​plate using a model-based hot vulcanization method. This ensures that the rubber body maintains its own structural strength and guarantees the bonding strength with the snap-fit ​​plate, thus forming a structurally stable rubber block component. Corresponding connecting locking mechanisms are provided on each rubber block component. Two corresponding rubber block components are connected and fitted onto the outer circumference of the logging electrode. The two rubber bodies combine to form a buffer rubber block with a circular cross-section. The maximum outer diameter of the buffer rubber block is larger than the inner diameter of the corresponding wellhead, ensuring that the buffer rubber block can only be seated or blocked at the wellhead and cannot fall into the well.

[0005] The aforementioned logging electrode anti-fall protection device preferably has a through hole on the structural sleeve 2, which allows the rubber body located in the inner and outer regions of the structural sleeve to be connected as one unit during the hot vulcanization process, thereby further enhancing the structural strength of the rubber body itself and the adhesion strength between it and the structural sleeve, and improving the stability of the rubber block component structure.

[0006] The aforementioned logging electrode anti-fall protection device preferably has an inverted conical surface on the outer semi-circular surface of the rubber body, and the buffer block formed by the combination of two rubber bodies is an inverted frustum. The diameter of the lower end face of the inverted frustum is less than or equal to the inner diameter of the wellhead, so that the buffer block can be partially elastically embedded in the wellhead under the action of gravity and can maintain the reliability and stability of the embedded connection with the wellhead.

[0007] The aforementioned well logging electrode anti-fall protection device preferably comprises a connecting locking mechanism on the rubber block component consisting of a hinged connection structure and a connecting locking structure. The hinged connection structure includes: hinged components respectively installed on one side end of the structural sleeve, corresponding to each other, which, through the connection and cooperation between the hinged components, allow two rubber block components to be hinged together. The two hinged rubber block components can be fan-shaped expanded or reset and closed along the hinge axis. Simultaneously, corresponding to the position of the hinge axis, axial expansion and retraction spaces are respectively provided on the rubber bodies on both sides of the hinged components to ensure that the rubber block components can be fully expanded. The connecting locking structure includes: a locking pin and locking tongues respectively disposed on the snap-fit ​​plate, each corresponding to the locking pin. Locking pin holes corresponding to the locking pins are respectively formed on the locking tongues. When the locking tongues are engaged, the locking pins are inserted into the locking pin holes to lock the assembly structure between the two rubber block components. When the rubber block components are fan-shaped, the logging electrode can be installed from the fan-shaped opening into the inner hole formed by the two rubber block components. When the rubber block components are reset and closed, the locking pins and locking pin holes engage to fix the assembled rubber block components onto the logging electrode.

[0008] In order to enhance the stability and reliability of the connection function of the hinged connection structure, the aforementioned logging electrode anti-fall protection device preferably has hinge bolts installed between the corresponding matching snap-fit ​​plates, so that the two snap-fit ​​plates are hinged to each other, and the hinge bolts are coaxially arranged with the hinged components installed between the two structural sleeves.

[0009] The aforementioned well logging electrode anti-fall protection device preferably comprises a connection locking mechanism on the rubber block component consisting of a bolt connection structure and a connection locking structure. The bolt connection structure includes a connecting plate and a connecting bolt. The connecting plate is correspondingly installed at the bottom of the rubber body, fixedly connected to the structural sleeve, and simultaneously adhered to the rubber body. Corresponding bolt connection holes are provided on the corresponding connecting plates. Installing the connecting bolts into the bolt connection holes allows the two rubber block components to be connected at the bottom. The connection locking structure includes a locking pin and corresponding locking tongues respectively provided on the snap-fit ​​plate. Locking pin holes corresponding to the locking pins are provided on the locking tongues. Inserting the locking pins into the locking pin holes when the locking tongues are in the corresponding engagement state locks the assembly structure between the two rubber block components.

[0010] The beneficial effects of this utility model are: it provides a logging electrode anti-fall-down protection device, which is installed on the outside of the logging electrode in a sleeve manner when the logging electrode is being pulled out of the well. This provides protection against accidental detachment of the logging electrode and its associated instruments from the traction cable during subsequent hoisting, adding a safety protection link and increasing the safety protection level. In the event of logging electrode detachment during production, the buffer rubber block formed by the split assembly can elastically seal or plug the wellhead, suspending the logging electrode and its associated instruments at the wellhead and preventing them from falling into the well and causing a serious production accident. This protects the logging instruments and reduces production losses. This protective device uses a metal structural sleeve as a rigid frame and employs a model hot vulcanization method to bond and lay rubber blocks, constructing a rubber block component with a composite structure. The buffer rubber block, formed by the split combination of the rubber block components, not only has a stable structure but also high structural strength. In the process of performing its protective function, it can effectively buffer the impact caused by the wellhead of the oil well to prevent the logging electrode from falling, thus preventing vibration damage to the logging electrode and its associated instruments. At the same time, it can reliably bear the overall weight of the logging electrode and its falling impact force, stably suspending and supporting the logging electrode, thereby achieving the purpose of this utility model. Attached Figure Description

[0011] Figure 1 This is a front view of the well logging electrode anti-fall protection device structure in Example 1.

[0012] Figure 2 This is a top view of the well logging electrode anti-fall protection device in Example 1.

[0013] Figure 3 for Figure 2 Sectional view of section AA.

[0014] Figure 4 This is a top view of the unfolded structure of the rubber block component of the well logging electrode anti-fall protection device in Example 1.

[0015] Figure 5 This is a rear view of the structure of the well logging electrode anti-fall protection device in Example 1.

[0016] Figure 6 This is a front view of the well logging electrode anti-fall protection device structure in Example 2.

[0017] Figure 7 This is a top view of the well logging electrode anti-fall protection device in Example 2.

[0018] Figure 8 for Figure 7 Sectional view of section BB.

[0019] Wherein: 1 is the snap-fit ​​plate, 2 is the structural sleeve, 3 is the rubber block, 4 is the arc-shaped flange, 5 is the hinge component, 6 is the locking pin, 7 is the locking tongue, 8 is the connecting plate, 9 is the connecting bolt, 10 is the logging electrode, 11 is the handle, 12 is the hinge bolt, and 13 is the locking pin hole. Detailed Implementation

[0020] Furthermore, the technical solution for which protection is sought in this utility model will be described in detail with reference to specific embodiments and accompanying drawings. Example 1

[0021] A logging electrode anti-fall protection device, such as Figures 1 to 5As shown, the structure is composed of two split-structure rubber blocks, each consisting of a snap-fit ​​plate 1, a structural sleeve 2, and a rubber block 3. The snap-fit ​​plate 1 is a semi-circular ring-shaped plate, and the two snap-fit ​​plates 1 can be combined to form a complete circular ring structure. An inwardly extending arc-shaped flange 4 is provided on the inner arc surface, and an outwardly extending locking tongue 7 is provided on the mating edge. The locking tongue 7 is staggered and positioned correspondingly on the two combined snap-fit ​​plates 1, and each locking tongue 7 has a locking pin hole 13. The locking pin holes 13 are located on the surface of the snap-fit ​​plate 1. A hinge hole is provided on the radially opposite side of the opening position, and a handle 11 is fitted on the outer circumference. In the combined state of the snap-fit ​​plates 1, a hinge bolt 12 is inserted into the hinge hole to hinge the two snap-fit ​​plates 1 together. The locking tongues 7 on the two snap-fit ​​plates 1 overlap each other, and the locking pin holes on the two locking tongues 7 are interconnected. The locking pin 6 is inserted into the locking pin hole to lock the combined structure between the snap-fit ​​plates 1. The structural sleeve 2 is a semi-circular arc-shaped sleeve, which is fixedly connected to the lower end face of the snap-fit ​​plate 1 by welding. In the combined structural state, two corresponding structural sleeves 2 can be simultaneously combined to form a cylindrical structure. The structural sleeves 2 have regularly arranged through-holes penetrating the sleeve plate surface. On the other side of the structural sleeve 2 corresponding to the side radially of the locking tongue 7 on the snap-fit ​​plate 1, two sets of hinge components 5 are respectively installed. The hinge component 5 is a bushing hinge, coaxially arranged with the hinge bolt 12 used to hinge the two snap-fit ​​plates 1. The rubber body 3, with the structural sleeves 2 as the structural skeleton, is correspondingly bonded and laid on the lower part of the snap-fit ​​plate 1 using a model hot vulcanization method. The connecting hole on the structural sleeve 2 allows the rubber bodies 3 on both sides of the structural sleeve 2 to be fused together. A semi-circular arc groove with the same arc radius as the inner arc surface of the snap-fit ​​plate 1 and the outer circumferential surface of the logging electrode 10 is provided on the inner side of the rubber body 3. The outer side is a semi-circular inverted conical surface. Two rubber bodies 3 can be combined to form an inverted frustum. The diameter of the upper end face of the combined inverted frustum is the same as that of the snap-fit ​​plate 1 and is larger than the inner diameter of the wellhead. The diameter of the lower end face is smaller than the inner diameter of the wellhead.

[0022] The logging electrode anti-fall protection device described in this embodiment is used in oilfield logging operations. The protection principle and installation method are as follows: Before lowering the logging electrode 10 and its accompanying logging instruments into the oil well, the logging electrode anti-fall protection device is connected and installed on the logging electrode 10. Specifically, the two hinged rubber support components are unfolded in a fan shape, as shown below. Figure 4As shown, the logging electrode 10 is inserted from the fan-shaped opening into the inner hole formed by the combination of the two rubber blocks. The position is adjusted along the axial direction of the logging electrode 10 so that the arc-shaped flange 4 on the locking plate 1 aligns with the annular chuck groove on the logging electrode 10. Then, the rubber blocks are reset and closed, so that the arc-shaped flange 4 is correspondingly embedded in the annular chuck groove. After confirming full reset, the locking pin 6 is inserted into the locking pin hole 13 to lock the combination structure of the two rubber blocks. Figure 3 As shown, the combined buffer rubber block is hung on the upper outer side of the logging electrode 10. Then, the logging electrode 10 and the logging instrument are lowered into the oil well according to conventional procedures. If, during the lowering process, the logging electrode 10 accidentally detaches from the traction cable, the buffer rubber block, which falls with the logging electrode 10, can prevent it from falling further into the oil well by blocking the wellhead. This provides safety protection for the logging electrode 10 and its associated logging instrument, controls the consequences of the accident, and reduces economic losses. When the upper end of the logging electrode 10, equipped with the aforementioned logging electrode anti-fall protection device, reaches the wellhead, it indicates that the logging electrode 10 and the logging instrument are safely in place. Once delivered downhole, the well logging electrode anti-fall protection device is removed from the well logging electrode 10 in the wellhead area, and normal downhole logging operations can begin. After completing the logging operation, the well logging electrode 10 is lifted. When the upper end of the well logging electrode 10 is exposed at the wellhead, the well logging electrode anti-fall protection device is immediately connected and hung on the well logging electrode 10 according to the aforementioned operation method to protect the well logging electrode 10 and its attached logging instruments from falling into the well during the well exit process. This process continues until the well logging electrode 10 and its attached logging instruments are completely lifted out of the well. After this, the well logging electrode anti-fall protection device is removed from the well logging electrode 10, thus completing the production and use of the well logging electrode anti-fall protection device. Example 2

[0023] A logging electrode anti-fall protection device, such as Figures 6 to 8As shown, the structure is composed of two split-structure rubber blocks, each consisting of a snap-fit ​​plate 1, a structural sleeve 2, a rubber block 3, and a connecting plate 8. Both the snap-fit ​​plate 1 and the connecting plate 8 are semi-circular ring-shaped plates. The two snap-fit ​​plates 1 and the two connecting plates 8 can be combined to form complete circular ring structures. The circular ring structures formed by these combinations have the same inner hole diameter. An inwardly extending arc-shaped flange 4 is provided on the inner arc surface of the snap-fit ​​plate 1. Outwardly extending locking tongues 7 are provided on both radially opposite sides of the combined mating edge. The locking tongues 7 are positioned on the two combined snap-fit ​​plates 1. The locking plates 1 are arranged in a staggered, inter-layered manner, with locking pin holes on each of the locking tongues 7. A handle 11 is mounted on the outer circumference. In the combined state of the locking plates 1, the locking tongues 7 at their radial ends overlap, and the locking pin holes on the locking tongues 7 are interconnected. Inserting two locking pins 6 into these holes locks the combined structure of the locking plates 1. Two sets of horizontally arranged, symmetrically arranged bolt holes are provided between the two corresponding connecting plates 8. The plates can be connected by connecting bolts 9 engaging with these bolt holes. Two connecting plates 8; the structural sleeve 2 is a semi-circular arc-shaped sleeve, with its upper and lower ends fixedly connected to the snap-fit ​​plate 1 and the connecting plate 8 by welding, respectively. In the combined structure of the snap-fit ​​plate 1 and the connecting plate 8, the two corresponding structural sleeves 2 can also be combined to form a cylindrical structure. The structural sleeve 2 has regularly arranged through-holes that penetrate the surface of the sleeve body. The rubber body 3 is bonded and laid between the snap-fit ​​plate 1 and the connecting plate 8 using the structural sleeve 2 as the structural skeleton and a model hot vulcanization method. The rubber bodies on both sides of the structural sleeve 2 can be connected through the through-holes. The three rubber bodies 3 are integrated into one unit. A semi-circular arc groove is provided on the inner side of the rubber body 3. The arc radius of the semi-circular arc groove is the same as the arc radius of the inner arc surface on the snap-fit ​​plate 1 and the connecting plate 8, as well as the arc radius of the outer circumference of the logging electrode 10. The outer side is a semi-circular inverted conical surface. The two rubber bodies 3 can be combined to form a complete inverted truncated cone. The diameter of the upper end face of the combined inverted truncated cone is the same as the diameter of the snap-fit ​​plate 1 and is larger than the inner diameter of the wellhead. The diameter of the lower end face is the same as the diameter of the connecting plate 8 and is smaller than the inner diameter of the wellhead.

[0024] The protective function and usage method of the well logging electrode anti-fall protection device described in this embodiment are exactly the same as those in Embodiment 1. However, based on its own structural features, the specific installation method during use is as follows: Take two rubber block components, align the arc-shaped flange 4 on the snap-fit ​​plate 1 with the annular chuck groove on the well logging electrode 10, and push them into the annular chuck groove respectively, so that the two rubber block components are combined to form a buffer rubber block. Then, insert locking pins 6 into the two sets of locking pin holes that are aligned and fitted by the two snap-fit ​​plates 1 to limit the combined structure of the two rubber block components. Then, adjust the fit between the two connecting plates 8 so that the bolt connection holes on the connecting plates 8 are aligned. Then, install the connecting bolts 9 in the bolt connection holes to lock the combined structure of the two rubber block components. Figure 8 As shown, the combined buffer block is hung on the upper outer side of the logging electrode 10. Since no new functional clearance space is required on the buffer block component in the logging electrode anti-fall protection device structure described in this embodiment, the buffer block composed of two such components can form a complete inverted frustum-shaped external structure. This structure has the advantages of balanced load-bearing and uniform deformation, thus providing more stable support for the logging electrode 10 when it is plugged at the wellhead to protect it from falling, providing more reliable production safety protection.

Claims

1. A well logging electrode anti-fall protection device, characterized in that... ,include: Two split-structure rubber-coated support components; The rubber block component further includes: a snap-fit ​​plate (1), a structural sleeve (2), and a rubber block (3). The snap-fit ​​plate (1) is a semi-circular annular plate. Two snap-fit ​​plates (1) can be combined to form a circular structure. The radius of the arc of the inner arc surface of the snap-fit ​​plate (1) corresponds to the radius of the arc of the outer circumference of the logging electrode (10). An arc-shaped flange (4) extending inward is provided on the inner arc surface. The arc-shaped flange (4) corresponds to the annular chuck groove structure opened on the outer circumference of the logging electrode (10) and can be fitted into the annular chuck groove. The radius of the arc of the outer arc surface of the snap-fit ​​plate (1) is larger than the inner diameter of the wellhead. The structural sleeve (2) is a semi-circular arc-shaped sleeve. Two structural sleeves (2) can be combined to form a ring structure. The components are assembled into a cylindrical structure. The structural sleeve (2) is set perpendicularly and coaxially with the plate surface of the snap-fit ​​plate (1) and fixedly connected to the lower end plate surface of the snap-fit ​​plate (1). The rubber block (3) is a semi-ring-shaped body corresponding to the structure of the snap-fit ​​plate (1). The structural sleeve (2) is used as a rigid structural skeleton and is bonded and laid on the lower end plate surface of the snap-fit ​​plate (1) by model hot vulcanization. The rubber block components are respectively provided with connecting locking mechanisms that are assembled and connected to each other. The two rubber block components corresponding to the structure are connected to each other and can be fitted on the outer circumference of the logging electrode (10). The two rubber blocks (3) are combined to form a buffer rubber block with a circular cross section. The maximum outer diameter of the buffer rubber block is greater than the inner hole diameter of the corresponding oil wellhead.

2. The well logging electrode anti-fall protection device as described in claim 1, characterized in that: A through hole is provided on the structural sleeve (2) to pass through the surface of the sleeve plate, so that the rubber blocks (3) located in the inner and outer regions of the structural sleeve (2) can be connected into one piece through the through hole during the hot vulcanization molding process.

3. The well logging electrode anti-fall protection device as described in claim 2, characterized in that: The outer semicircular surface of the rubber block (3) is an inverted conical surface, and the buffer block formed by the combination of two rubber blocks (3) is an inverted frustum.

4. A logging electrode anti-fall protection device as described in any one of claims 1 to 3, characterized in that: The connecting locking mechanism on the rubber block component is composed of a hinged connection structure and a connecting locking structure. The hinged connection structure includes: hinged components (5) respectively installed on one side of the structure sleeve (2) with corresponding structures. The two rubber block components are hinged together by the connection between the hinged components (5). The two rubber block components can be fan-shaped to unfold or reset and close along the hinge axis. At the same time, corresponding to the setting position of the hinge axis, the rubber blocks (3) on both sides of the hinged components (5) are respectively provided with unfolding and retraction space along the axial direction. The connecting locking structure includes: a locking pin (6) and locking tongues (7) respectively set on the snap plate (1) with corresponding structures. Locking pin holes (13) corresponding to the locking pins (6) are respectively opened on the locking tongues (7). When the locking pins (6) are inserted into the locking pin holes (13) in the corresponding engagement state of the locking tongues (7), the assembly structure between the two rubber block components can be locked.

5. The logging electrode anti-fall protection device as described in claim 4, characterized in that: A hinge bolt (12) is installed between the corresponding snap-fit ​​plates (1) so that the two snap-fit ​​plates (1) are hinged to each other. The hinge bolt (12) is coaxially arranged with the hinge member (5) installed between the two structural sleeves (2).

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