A cement sheath detection device

Abstract

The utility model relates to cement ring experimental technical field especially relates to a cement ring detection device. The cement ring detection device includes the frame body, the lower and upper of frame body inside are equipped with respectively with the lower sealing ring and upper sealing ring of the bottom and top end of cement ring, and frame body inside still is equipped with the plugging assembly of the cover of lower sealing ring and upper sealing ring is equipped. The cement ring detection device provided by the utility model, the upper sealing ring and lower sealing ring are assembled in the sliding mode, and the extrusion force is generated when the hydraulic cylinder is pressed down in use, and the end face sealing is adhered, the different wall thickness cement ring is only replaced with the corresponding sealing ring, need not to disassemble the cylinder tool, greatly simplify the dismounting procedure, and then the staff can select the lower sealing ring and upper sealing ring that are adapted to the thickness specification of the cement ring to be detected before detection.

Description

Technical Field

[0001] This utility model relates to the field of cement ring testing technology, and in particular to a cement ring detection device. Background Technology

[0002] Cement sheaths in oil and gas wells are the core barrier for long-term sealing of the wellbore, separating formation fluids, supporting the casing, and preventing inter-layer flow, directly affecting the safety of the oil and gas well throughout its entire life cycle. However, cement sheath seal failure has become a major challenge in the development of deep and unconventional wells: minor failures increase maintenance costs and reduce recovery rates, while severe failures can cause oil and gas leaks, casing corrosion, and even well control accidents and well abandonment, resulting in significant economic losses. Therefore, before applying cement formulations and cementing processes, it is necessary to use indoor simulation equipment to recreate the downhole temperature and pressure stress coupling environment, quantitatively test the interfacial bonding, crack resistance, and sealing and anti-flow performance of the casing-cement sheath composite structure, and pre-match the appropriate cement system to prevent potential wellbore integrity risks from the source.

[0003] A cement sheath integrity simulation evaluation test instrument with Chinese patent publication number CN218331014U has been described in its specification. The upper and lower sealing plates that abut against the cement sheath are fixedly installed. During testing, since different cement sheaths have different thicknesses, this fixed installation method is not convenient for testing cement sheaths of different thicknesses, thus reducing the applicability of the device.

[0004] Therefore, it is necessary to provide a new cement ring detection device to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a cement ring detection device.

[0006] The cement ring detection device provided by this utility model includes a frame, and a lower sealing ring and an upper sealing ring are respectively provided at the bottom and top of the frame to abut against the bottom and top of the cement ring. The frame also includes a sealing component that covers the lower sealing ring and the upper sealing ring. The sealing assembly includes a lower sealing cylinder and an upper sealing cylinder, which are located outside the lower sealing ring and the upper sealing ring, respectively. Multiple evenly distributed lower positioning rods are fixedly installed at the bottom inner part of the lower sealing cylinder, and a fixedly connected adapter frame is mounted on the top inner part of the upper sealing cylinder. Multiple evenly distributed upper positioning rods are fixedly installed on the adapter frame. A lower support ring is fixedly connected to the outer wall of the lower sealing ring. The bottom of the lower support ring is slidably fitted onto the outer wall of the lower positioning rod through a through hole. A lower slot is provided at the top of the lower sealing ring. An upper support plate is fixedly connected to the outer wall of the upper sealing ring, and the bottom of the upper support plate is slidably fitted onto the outer wall of the upper positioning rod through a through hole. An upper groove is provided at the bottom end of the upper sealing ring.

[0007] Preferably, a transition tube is provided between the lower sealing tube and the upper sealing tube, and there are multiple transition tubes, each with a different height.

[0008] Preferably, the top of the lower sealing cylinder and the adapter cylinder are both equipped with fixedly connected positioning rings, and the bottom of the upper sealing cylinder and the adapter cylinder are both provided with positioning grooves, with the outer wall of the positioning ring abutting against the inner wall of the positioning groove.

[0009] Preferably, a discharge pipe communicating with the interior of the lower sealing ring is fixedly installed at the bottom of the lower sealing cylinder, a nitrogen detector and a pressure detector are fixedly installed on both sides inside the lower sealing cylinder, and the bottom of the lower sealing cylinder is fixedly connected to the inner bottom of the frame through a support block.

[0010] Preferably, the top of the upper sealing cylinder is fixedly installed with a nitrogen pipe, an adding pipe, and a pressurizing pipe that communicate with the inside of the upper sealing ring, and the top of the upper sealing cylinder is also fixedly connected with a connecting frame.

[0011] Preferably, a through slot is provided at the center of the top of the frame, a fixedly connected top frame is installed on the top of the frame, a hydraulic cylinder is provided between the top frame and the connecting frame, the fixed end of the hydraulic cylinder is fixedly connected to the inner top of the top frame, and the output end of the hydraulic cylinder is fixedly connected to the top of the connecting frame.

[0012] Preferably, the top of the frame is provided with a through hole, and a guide rod that is slidably connected is inserted into the through hole, and the bottom end of the guide rod is fixedly connected to the top of the connecting frame.

[0013] Compared with related technologies, the cement ring detection device provided by this utility model has the following beneficial effects: 1. This utility model assembles the upper and lower sealing rings by sliding. During use, the hydraulic cylinder presses down to generate extrusion force to complete the end face sealing. When replacing cement rings of different wall thicknesses, only the corresponding sealing ring needs to be replaced, without disassembling the cylinder tooling, which greatly simplifies the disassembly and assembly process. This allows the staff to flexibly select the appropriate lower and upper sealing rings according to the thickness specifications of the cement ring to be tested before testing, and place them inside the lower and upper sealing cylinders to complete the installation. The entire installation process does not require the use of additional fastening parts, thus improving the staff's flexibility in replacing the lower and upper sealing rings. 2. Before testing, this utility model can flexibly select an adapter tube of the corresponding height according to the required height of the cement ring to be tested, thereby changing the overall height of the sealing component after sealing, and thus making it suitable for cement rings of different heights, thereby further improving the scope of application. 3. When placing the cement ring, this utility model reduces the overall height of the top of the lower sealing cylinder, making it more flexible for personnel to place the cement ring onto the lower sealing ring. It also reduces the impact of the deeper outer cylinder of the lower sealing ring on the cement ring placement operation after the adapter cylinder is connected. Similarly, after the test is completed, the outer adapter cylinder can be removed first to expose the cement ring before it is picked up and unloaded. Therefore, it can improve the flexibility of personnel in picking up and placing the cement ring during the test process. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the cement ring detection device provided by this utility model; Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure shown from the front view; Figure 3 for Figure 1 The diagram shows a partial cross-sectional view of the lower and upper sealing rings. Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the sealing assembly shown; Figure 5 for Figure 1 The diagram shows the structure of the frame and its components.

[0015] The diagram labels are as follows: 1. Frame; 11. Top frame; 12. Through slot; 13. Through hole; 2. Lower sealing ring; 21. Lower slot; 22. Lower support ring; 3. Sealing assembly; 31. Lower sealing cylinder; 311. Lower positioning rod; 312. Discharge pipe; 313. Nitrogen detector; 314. Pressure detector; 32. Upper sealing cylinder; 321. Adapter frame; 322. Upper positioning rod; 323. Nitrogen pipe; 324. Addition pipe; 325. Pressure boosting pipe; 33. Adapter cylinder; 34. Positioning ring; 35. Positioning slot; 4. Upper sealing ring; 41. Upper slot; 42. Upper support plate; 5. Hydraulic cylinder; 51. Connecting frame; 52. Guide rod. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1 to 5 The present invention provides a cement ring detection device, which includes a frame 1. The frame 1 has a lower sealing ring 2 and an upper sealing ring 4 that abut against the bottom and top of the cement ring, respectively. The frame 1 also has a sealing component 3 that covers the lower sealing ring 2 and the upper sealing ring 4.

[0019] In the embodiments of this utility model, please refer to Figures 1 to 5 The sealing assembly 3 includes a lower sealing cylinder 31 and an upper sealing cylinder 32, which are located outside the lower sealing ring 2 and the upper sealing ring 4, respectively. Multiple evenly distributed lower positioning rods 311 are fixedly installed at the inner bottom of the lower sealing cylinder 31. A fixedly connected adapter frame 321 is mounted on the inner top of the upper sealing cylinder 32, and multiple evenly distributed upper positioning rods 322 are fixedly installed on the adapter frame 321. A fixedly connected lower support ring 22 is fitted onto the outer wall of the lower sealing ring 2, and the bottom of the lower support ring 22 is slidably fitted onto the outer wall of the lower positioning rod 311 through a through hole. A lower slot 21 is opened at the top of the lower sealing ring 2. A fixedly connected upper support plate 42 is fitted onto the outer wall of the upper sealing ring 4, and the bottom of the upper support plate 42 is slidably fitted onto the outer wall of the upper positioning rod 322 through a through hole. An upper slot 41 is opened at the bottom of the upper sealing ring 4.

[0020] It should be noted that by replacing the bolt-locking method for installing the upper sealing ring 4 and the lower sealing ring 2 with a sliding insertion assembly, the operator can flexibly select the upper sealing ring 4 and the lower sealing ring 2 that are compatible with the thickness specifications of the cement ring during the cement ring inspection process. They can then be fitted onto the corresponding lower positioning rod 311 and upper positioning rod 322 outside the corresponding lower support ring 22 and upper support plate 42 on the outer wall to complete the installation. The entire installation method is more flexible and convenient, and no additional fastening parts are required. Therefore, it can improve the operator's flexibility in replacing the lower sealing ring 2 and the upper sealing ring 4. After the upper sealing ring 4 is placed on the adapter 321, the distance between the top of the upper support plate 42 and the top of the upper positioning rod 322 is greater than the distance between the top of the upper sealing ring 4 and the inner top of the upper sealing cylinder 32. As a result, during the downward pressing of the upper sealing cylinder 32, when the bottom of the upper sealing ring 4 abuts against the top of the cement ring, the upper sealing ring 4 is pushed up in the opposite direction, so that the top of the upper sealing ring 4 abuts against the inner top of the upper sealing cylinder 32. During this process, the upper positioning rod 322 can stably guide the movement of the upper sealing ring 4 and prevent the upper sealing ring 4 from having horizontal displacement. Furthermore, rubber sealing gaskets are provided at all mating and abutting end faces of the upper sealing ring 4, lower sealing ring 2, upper sealing cylinder 32, lower sealing cylinder 31, and transition cylinder 33 in the device. When the cylinders are mated and the sealing rings are mated with the cement ring, the rubber gaskets are compressed and filled in the assembly gap of the end face, effectively blocking the leakage of the medium from each mating gap, and significantly improving the overall sealing performance of the entire sealing structure.

[0021] In the embodiments of this utility model, please refer to Figures 1 to 5 A transition tube 33 is provided between the lower sealing tube 31 and the upper sealing tube 32. There are multiple transition tubes 33, and the height of each transition tube 33 is different. The top of the lower sealing tube 31 and the transition tube 33 are fixedly connected with positioning rings 34. The bottom of the upper sealing tube 32 and the transition tube 33 are provided with positioning grooves 35, and the outer wall of the positioning ring 34 abuts against the inner wall of the positioning groove 35.

[0022] It should be noted that: since the upper sealing cylinder 32 and the lower sealing cylinder 31 are sealed by compression during use, and the upper sealing cylinder 32 moves downward, it can drive the upper sealing ring 4 to move downward synchronously. However, during testing, when the height of the cement ring changes, the downward stroke of the upper sealing ring 4 will change. Therefore, when testing cement rings of different heights, the corresponding height of the adapter cylinder 33 can be selected. When the bottom of the upper sealing ring 4 abuts against the top of the cement ring, and the driving force causes the upper sealing ring 4 to move upward in the opposite direction, abutting against the inner top of the upper sealing cylinder 32, the positioning groove 35 at the bottom of the upper sealing cylinder 32 can abut against the positioning ring 34 at the top of the adapter cylinder 33, thereby achieving synchronous sealing.

[0023] In the embodiments of this utility model, please refer to Figures 1 to 5 The bottom of the lower sealing cylinder 31 is fixedly installed with a discharge pipe 312 that communicates with the inside of the lower sealing ring 2. Nitrogen detector 313 and pressure detector 314 are fixedly installed on both sides inside the lower sealing cylinder 31, and the bottom of the lower sealing cylinder 31 is fixedly connected to the inner bottom of the frame 1 through a support block. The top of the upper sealing cylinder 32 is fixedly installed with a nitrogen pipe 323, a filling pipe 324 and a pressurizing pipe 325 that communicate with the inside of the upper sealing ring 4. The top of the upper sealing cylinder 32 is also fixedly installed with a connecting frame 51. A through groove 12 is opened in the center of the top of the frame 1. A top frame 11 is fixedly installed on the top of the frame 1. A hydraulic cylinder 5 is mounted between the top frame 11 and the connecting frame 51. The fixed end of the hydraulic cylinder 5 is fixedly connected to the inner top of the top frame 11, and the output end of the hydraulic cylinder 5 is fixedly connected to the top of the connecting frame 51.

[0024] It should be noted that the two types of detection elements are arranged independently and do not interfere with each other. Three independent pipelines are arranged vertically on the top surface of the upper sealing cylinder 32, which are connected to the corresponding external pipelines respectively. This allows nitrogen to be smoothly added into the cement ring body by the nitrogen pipe 323 during detection, and media such as light oil, water and cement slurry to be added into the cement ring body by the adding pipe 324. The pressurization pipe 325 can be pressurized by connecting to an external pressurization device. During testing, while liquid medium is injected into the inner cavity of the cement ring, nitrogen pipe 323 remains closed. Pressure detector 314 can collect pressure changes in real time and record the critical pressure value when the cement ring structure leaks or breaks, which is used to determine the overall pressure bearing capacity of the cement ring. Nitrogen detector 313 continuously monitors the outer sealed cavity, captures trace amounts of gaseous substances released after liquid leakage, and can identify hidden micro-annular gaps and micro-cracks that are only permeable to air and have no obvious liquid leakage, thus avoiding blind spots in detection caused by single pressure monitoring. When high-pressure nitrogen is introduced into the inner cavity of the cement ring, all liquid pipelines are closed and emptied. The nitrogen detector 313 detects the nitrogen concentration in the outer cavity in real time. Based on the concentration change range, it distinguishes between micropore penetration and through-type atmospheric leakage channels, and intuitively evaluates the cement ring's ability to prevent gas leakage. The pressure detector 314 can simultaneously collect the real-time pressure of nitrogen in the inner cavity, establish the correspondence between pressure and leakage concentration, distinguish between normal gas adsorption of cement substrate and leakage due to structural damage, accurately record the critical pressure corresponding to gas leakage failure, and provide pressure benchmark data for the quantitative evaluation of cement ring sealing performance. Both of the above test conditions adopt a dual-element synchronous monitoring mode. The two sets of monitoring data corroborate each other, which can completely and accurately determine the pressure-bearing performance and gas leakage sealing performance of the cement ring. Furthermore, during the testing process, the booster pipe 325 is connected to an external booster device. After the medium is injected into the inner cavity through the addition pipe 324, pressure can be continuously delivered to the inner cavity through the booster pipe 325 to gradually increase the internal pressure of the cement sheath sealed cavity, simulating the downhole high-pressure working condition, thereby completing the pressurization test of the cement sheath's pressure-bearing and gas channeling prevention performance. After the injected medium has been tested, the valve on the discharge pipe 312 can be opened to discharge the tested medium.

[0025] In the embodiments of this utility model, please refer to Figures 1 to 5 The top of the frame 1 is also provided with a through hole 13, and a sliding guide rod 52 is inserted into the through hole 13, and the bottom end of the guide rod 52 is fixedly connected to the top of the connecting frame 51.

[0026] It should be noted that the hydraulic cylinder 5 is driven by servo hydraulics and can be extended to different lengths as needed during use, thereby achieving stable sealing of the sealing component 3 and the end of the cement ring. The frame 1 is made of high-strength welded profiles, and the overall structure is rigid enough to withstand the continuous downward pressure load of the hydraulic cylinder 5. The frame will not deform after long-term use, ensuring the sealing and coaxial accuracy. The guide rod 52 adopts a multi-circular symmetrical arrangement and multi-point synchronous limiting, which can effectively eliminate the problem of unilateral force tilting of the upper sealing cylinder 32, and can make the sealing fit uniform without the generation of local gaps. In an optional embodiment, a pressure sensor can be embedded at the bottom of the upper sealing cylinder 32. During the process of the hydraulic cylinder 5 pressing and sealing, the pressure sensor can collect the end face pressing data to help determine the sealing fit effect of the docking position, thus ensuring the sealing effect of the docking part.

[0027] The working principle of the cement ring detection device provided by this utility model is as follows: Before testing, staff can select matching upper sealing ring 4, lower sealing ring 2 and corresponding height adapter cylinder 33 according to the overall height of the cement ring to be tested and the wall thickness of the pipe. Then, the lower sealing ring 2 can be placed inside the lower sealing cylinder 31 through the lower support ring 22 along the lower positioning rod 311, and the upper sealing ring 4 can be placed inside the upper sealing cylinder 32 through the upper support plate 42 and the upper positioning rod 322. Next, the cement ring specimen can be removed and placed in the lower groove 21 of the lower sealing ring 2. Then, the corresponding height of the adapter cylinder 33 is fitted onto the positioning ring 34 at the top of the lower sealing cylinder 31 through the positioning groove 35 at the bottom. After the components are placed, the hydraulic cylinder 5 can be activated to extend the corresponding length according to the set program, thereby pushing the upper sealing cylinder 32 to move down as a whole. When the upper groove 41 at the bottom of the upper sealing ring 4 initially abuts against the top of the cement ring, as the hydraulic cylinder 5 continues to extend, the upper sealing ring 4 will move up along the upper positioning rod 322. When the top of the upper sealing ring 4 abuts against the inner top of the upper sealing cylinder 32, the upper sealing cylinder 32 and the lower sealing cylinder 31 will smoothly and tightly abut against the two ends of the adapter cylinder 33, thereby simultaneously completing the sealing of the two ends of the cement ring and the external sealing component 3. Then, pressurized medium or nitrogen is injected into the sealed inner cavity of the cement ring through the addition pipe 324 or nitrogen pipe 323 for testing. After the test is completed, the valve on the discharge pipe 312 can be opened to discharge the medium outward. Then, the hydraulic cylinder 5 is controlled to retract, and the adapter cylinder 33 and the cement ring can be taken out in sequence.

[0028] The hydraulic cylinder 5 in this invention is connected to a standard hydraulic system via an external pipeline to achieve its extension and retraction control. The specific setup of this hydraulic system is conventional technology in this field. In addition, the circuit involved in this invention is controlled by a PLC controller. The PLC collects data from the detection elements and controls the on / off state of the hydraulic solenoid valves in sequence according to a preset program. Circuit acquisition and hydraulic closed-loop control are both existing mature technologies, which will not be elaborated on in this article.

[0029] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cement ring detection device, comprising a frame (1), wherein a lower sealing ring (2) and an upper sealing ring (4) are respectively provided at the bottom and top of the frame (1) to abut against the bottom and top of the cement ring, and a sealing assembly (3) is also provided inside the frame (1) to cover the lower sealing ring (2) and the upper sealing ring (4). Its features are: The sealing assembly (3) includes a lower sealing cylinder (31) and an upper sealing cylinder (32). The lower sealing cylinder (31) and the upper sealing cylinder (32) are located outside the lower sealing ring (2) and the upper sealing ring (4), respectively. Multiple evenly distributed lower positioning rods (311) are fixedly installed on the inner bottom of the lower sealing cylinder (31). A fixedly connected adapter frame (321) is mounted on the inner top of the upper sealing cylinder (32). Multiple evenly distributed upper positioning rods (322) are fixedly installed on the adapter frame (321). The lower sealing ring (2) is fitted with a fixedly connected lower support ring (22) on its outer wall. The bottom of the lower support ring (22) is slidably fitted on the outer wall of the lower positioning rod (311) through a through hole. The top of the lower sealing ring (2) is provided with a lower slot (21). The upper sealing ring (4) is fitted with a fixed upper support plate (42) on its outer wall, and the bottom of the upper support plate (42) is slidably fitted on the outer wall of the upper positioning rod (322) through a through hole. The bottom end of the upper sealing ring (4) is provided with an upper slot (41).

2. The cement ring detection device according to claim 1, characterized in that, A transition tube (33) is provided between the lower sealing tube (31) and the upper sealing tube (32). There are multiple transition tubes (33), and the height of each transition tube (33) is different.

3. The cement ring detection apparatus of claim 2, wherein, The top of the lower sealing cylinder (31) and the adapter cylinder (33) are both equipped with a fixedly connected positioning ring (34), and the bottom of the upper sealing cylinder (32) and the adapter cylinder (33) are both provided with positioning grooves (35), and the outer wall of the positioning ring (34) abuts against the inner wall of the positioning groove (35).

4. The cement ring detection apparatus of claim 1, wherein, The bottom of the lower sealing cylinder (31) is fixedly installed with a discharge pipe (312) communicating with the inside of the lower sealing ring (2). Nitrogen detector (313) and pressure detector (314) are fixedly installed on both sides inside the lower sealing cylinder (31), and the bottom of the lower sealing cylinder (31) is fixedly connected to the inner bottom of the frame (1) through a support block.

5. The cement ring detection apparatus of claim 1, wherein, The top of the upper sealing cylinder (32) is fixedly installed with a nitrogen pipe (323), an adding pipe (324) and a pressurizing pipe (325) that communicate with the inside of the upper sealing ring (4), and the top of the upper sealing cylinder (32) is also fixedly installed with a connecting frame (51).

6. The cement ring detection apparatus of claim 5, wherein, A through slot (12) is provided at the center of the top of the frame (1). A fixed top frame (11) is installed on the top of the frame (1). A hydraulic cylinder (5) is installed between the top frame (11) and the connecting frame (51). The fixed end of the hydraulic cylinder (5) is fixedly connected to the inner top of the top frame (11), and the output end of the hydraulic cylinder (5) is fixedly connected to the top of the connecting frame (51).

7. The cement ring detection apparatus of claim 6, wherein, The top of the frame (1) is also provided with a through hole (13), and a sliding guide rod (52) is inserted into the through hole (13), and the bottom end of the guide rod (52) is fixedly connected to the top of the connecting frame (51).

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