Oil production underground corrosion monitoring equipment

Abstract

An underground corrosion monitoring device for a producing well comprises a hoop, a housing and a monitoring mechanism. The hoop is used for being fixed to an oil pipe. The housing is arranged on the hoop; the monitoring mechanism is arranged in the housing; the housing is used for being arranged in the axial direction of an oil pipe. A circulation opening is formed in the side, close to the oil pipe, of the housing. The two housings are used for being symmetrically arranged on the two sides of the oil pipe. The housings are symmetrically arranged on the two sides, the oil pipe is guided to be kept on the central axis of an oil well in the well descending process, and oil pipe deflection caused by the fact that the oil pipe deviates towards one side of the axis of the oil well is avoided; according to the corrosion monitoring device, underground liquid enters the housing through the circulation opening formed in the side direction and makes contact with the monitoring mechanism, the situation that the underground liquid flushes the monitoring mechanism directly in the process that an oil pipe descends into a well is avoided, protection of the housing to the monitoring mechanism is improved, and the problem that an oil pipe is prone to deflection and damage due to an existing corrosion monitoring device is solved.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas well detection and monitoring technology, and particularly relates to a corrosion monitoring device for oil wells. Background Technology

[0002] During oil extraction, the downhole environment is complex and variable. The presence of temperature, pressure, and corrosive chemicals makes tubing and equipment susceptible to corrosion. To prevent leaks due to excessive corrosion, it is necessary to monitor the corrosion status of the tubing. Current methods for monitoring downhole tubing corrosion mainly rely on periodic downhole operations and sampling analysis. This requires removing the pipeline from the well to observe the corrosion, which is time-consuming, labor-intensive, inconvenient for data collection, and unable to achieve real-time monitoring. Consequently, corrosion problems are difficult to detect and address in a timely manner.

[0003] The prior art discloses a corrosion monitoring device for downhole tubing (publication number CN219101320U), which includes a housing fixed to the tubing using a U-shaped clip. A monitoring mechanism is installed in the cavity of the housing, so that the monitoring mechanism can enter the well along with the tubing and monitor the corrosion status of the tubing in real time on one side of the tubing, thus realizing real-time monitoring.

[0004] However, the housing of the corrosion monitoring device is located on one side of the tubing, which makes the tubing with the corrosion monitoring device installed have a structure that protrudes on one side. After contact with the well wall, the tubing is prone to shifting to one side of the well axis, causing a section of the tubing to bend. In addition, one end of the space where the probe of the monitoring mechanism is located has an opening that is axially opened. When the tubing is lowered into the well, the fluid in the well will rush directly into the space where the probe is located through the opening, and the probe is prone to bending and damage under impact. Utility Model Content

[0005] In view of the shortcomings of the related technologies, this utility model provides a corrosion monitoring device for oil wells to solve the problems that current corrosion monitoring devices are prone to causing oil pipe bending and damage.

[0006] This utility model provides a downhole corrosion monitoring device for oil wells, comprising:

[0007] Clamps are used to secure oil pipes.

[0008] The cover is installed on the clamp;

[0009] The monitoring equipment is housed inside the enclosure.

[0010] The cover is used to be installed on the axial direction of the oil pipe, and a flow port is provided on the side of the cover near the oil pipe; there are two covers, which are symmetrically arranged on both sides of the oil pipe.

[0011] In some embodiments, the surface of the cover away from the oil pipe is a mating surface; all mating surfaces are arc surfaces and are located on the same circumference concentric with the oil pipe.

[0012] In some embodiments, the end faces at both ends of the cover are arc-shaped.

[0013] In some embodiments, the side of the housing closest to the oil pipe is open, and the monitoring mechanism extends out of the housing on the side closest to the oil pipe.

[0014] In some embodiments, the monitoring agency includes:

[0015] Inner shell, installed inside the cover;

[0016] The monitoring and control board is installed inside the inner shell;

[0017] The battery, housed in the inner casing, powers the monitoring and control board.

[0018] The corrosion probe is installed in the inner shell and electrically connected to the monitoring and control board; the inner shell has a detection port, and the measuring end of the corrosion probe extends into the detection port.

[0019] In some embodiments, the detection port is located at the lower end of the inner shell, and multiple water-permeable holes are located at the lower end of the cover.

[0020] In some embodiments, the detection port is a port at one end of the inner shell, which is filled with potting compound; the potting compound seals the detection port so that the measuring end of the corrosion probe is flush with or extends out of the potting compound.

[0021] In some embodiments, there are two clamps, each connected to one end of the housing.

[0022] In some embodiments, the clamp includes two arc-shaped members; one end of the two arc-shaped members is hinged together by a pin, and the other end of the two arc-shaped members is connected together by a connecting bolt; at least one arc-shaped member is provided with a wire passage portion protruding away from the oil pipe, the wire passage portion forming a wire passage groove.

[0023] In some embodiments, it further includes:

[0024] An insulating buffer pad is used to cover the tubing; a housing and / or monitoring mechanism are used to press and fix the insulating buffer pad to the tubing.

[0025] Compared with the prior art, the beneficial effects of this application are as follows: In the embodiment of this utility model, the cover is symmetrically arranged on both sides, which guides the tubing to stay on the central axis of the well during the process of running the tubing down the well, avoiding tubing deflection caused by the tubing shifting to one side of the well axis; the downhole fluid enters the cover through the laterally opened flow port and comes into contact with the monitoring mechanism, avoiding the downhole fluid from directly impacting the monitoring mechanism during the process of running the tubing down the well, improving the protection of the monitoring mechanism by the cover, and solving the problem that current corrosion monitoring devices are prone to tubing deflection and damage. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the downhole corrosion monitoring equipment of this utility model. Figure One ;

[0028] Figure 2 This is a schematic diagram of the structure of the downhole corrosion monitoring equipment of this utility model. Figure Two ;

[0029] Figure 3 This is a schematic diagram of the structure of the downhole corrosion monitoring equipment of this utility model when it is installed on the oil pipe;

[0030] Figure 4 This is a schematic diagram of the structure of the downhole corrosion monitoring equipment of this utility model after the inner shell is hidden.

[0031] In the picture:

[0032] 100. Oil pipe; 1. Clamp; 101. Arc-shaped component; 102. Pin; 103. Connecting bolt; 104. Cable guide; 2. Cover; 201. Flow port; 202. Mating surface; 203. Water permeable hole; 3. Monitoring mechanism; 301. Inner shell; 302. Monitoring and control board; 303. Battery; 304. Corrosion probe; 3041. Wiring terminal; 3042. Measuring end; 305. Detection port. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In oil extraction, tubing extends downwards from the wellhead to the bottom of the well to extract oil to the surface. The underground environment is characterized by high temperatures and pressures, as well as corrosive chemicals, making tubing susceptible to corrosion.

[0038] like Figures 1 to 4 As shown in the schematic embodiment of the downhole corrosion monitoring device of this utility model, the downhole corrosion monitoring device includes a clamp 1, a cover 2, and a monitoring mechanism 3.

[0039] The monitoring mechanism 3 is installed inside the housing 2, which is mounted on the clamp 1. The clamp 1 is fixed to the tubing 100 by a circumferential clamping mechanism, allowing the monitoring mechanism 3 to enter the well along with the tubing 100 to monitor the corrosion status of the tubing 100. The housing 2 is positioned axially along the tubing 100, ensuring a close fit. A flow port 201 is provided on the side of the housing 2 closest to the tubing 100, through which downhole fluid enters the housing 2, enabling the monitoring mechanism 3 to monitor the corrosion rate at the location of the tubing 100. Two housings 2 are symmetrically arranged on both sides of the tubing 100.

[0040] In existing technology, the probe of the monitoring mechanism is located in a cavity of the equipment housing, with an opening at the bottom of the cavity. During the process of the tubing 100 carrying the equipment down the well, the fluid in the well will scour the equipment housing upwards, causing the fluid to rush into the cavity where the probe is located through the opening. The probe is easily deformed and damaged under the impact of the fluid. The structural design of this utility model allows the casing 2 to enclose the monitoring mechanism 3 inside it. The lower end of the casing 2 is closed towards the bottom of the well. When the tubing 100 carries the corrosion monitoring equipment down the well, the fluid in the well impacts the end of the casing 2 upwards, preventing it from impacting the monitoring mechanism 3 and avoiding damage to the monitoring mechanism 3 under the impact of the fluid.

[0041] In existing technology, the equipment housing is fixed to one side of the tubing 100, and there is a large gap between the side of the tubing 100 away from the equipment housing and the well wall. During the process of lowering the tubing 100 into the well, one side of the tubing 100 is prone to lose radial support and bend away from the equipment housing, resulting in the tubing 100 not being in a straight line from top to bottom. The bend in the tubing 100 increases the resistance to internal fluid flow, requiring greater pumping force when the oil extraction equipment uses the tubing 100 to pump oil from the well to the surface, and the smoothness of oil flow during the extraction process is also poor, affecting the extraction efficiency. The structural design of this utility model allows both covers 2 on both sides of the tubing 100 to slide against the well wall during the lowering process, supporting the tubing 100 and keeping it on the central axis of the well. This ensures that the entire tubing 100 remains in a straight line from top to bottom, preventing local bends that would increase internal flow resistance and ensuring that oil can be smoothly extracted to the surface without requiring a large power drive.

[0042] In some embodiments, the surface of the cover 2 away from the tubing 100 is a mating surface 202. All mating surfaces 202 are arc-shaped and located on the same circumference concentric with the tubing 100. Since the cross-section of the well is circular, this structural design makes the outer sidewall of the cover 2 smooth and matches the inner wall of the well, ensuring that the circumferences of the two cover 2 are coaxial with the well, improving the accuracy of the alignment of the tubing 100, and allowing for smoother sliding as the tubing 100 is lowered into the well, preventing the cover 2 from scratching the inner wall of the tubing 100.

[0043] In some embodiments, the end faces at both ends of the casing 2 are arc-shaped. This structural design allows for a smooth transition at both ends of the casing 2, enabling the flow of downhole fluids during the running-in process. This reduces the resistance generated by the casing 2 during the running-in of the tubing 100, improves the efficiency of the running-in operation of the tubing 100, and also prevents the casing 2 from having sharp edges that could scratch the well wall.

[0044] In some embodiments, the side of the housing 2 closest to the tubing 100 is open, forming a flow port 201, and the monitoring mechanism 3 extends partially out of the housing 2 from the side closest to the tubing 100. This structural design simplifies the structure of the housing 2, allowing the flow port 201 to cover the entire side of the housing 2. The monitoring mechanism 3 can be inserted into the housing 2 through the open side, making it easier for downhole fluid to flow into the housing 2 and contact the probe or sensor located at the end of the monitoring mechanism 3. Furthermore, the side of the monitoring mechanism 3 can partially extend, while the end face of the monitoring mechanism 3 remains within the housing 2, protecting the probe or sensor located at the end of the monitoring mechanism 3. The side of the monitoring mechanism 3 contacts the downhole fluid, allowing the downhole fluid to effectively remove the heat generated during the operation of the monitoring mechanism 3, thus improving the operational stability of the monitoring mechanism 3.

[0045] In some embodiments, the monitoring mechanism 3 includes an inner shell 301, a monitoring control board 302, a battery 303, and a corrosion probe 304. The inner shell 301 is installed inside the cover 2, and the monitoring control board 302, battery 303, and corrosion probe 304 are all installed in the inner shell 301. The battery 303 and corrosion probe 304 are both electrically connected to the monitoring control board 302. The battery 303 supplies power to the monitoring control board 302, enabling the monitoring control board 302 to collect corrosion rate data through the corrosion probe 304. The corrosion probe 304 has a wiring terminal 3041 and a measuring terminal 3042. The wiring terminal 3041 is used for electrical connection to the monitoring control board 302, and the measuring terminal 3042 is used for contact with the downhole fluid. The inner casing 301 has a detection port 305. The measuring end 3042 of the corrosion probe 304 extends into the detection port 305. The downhole fluid contacts the measuring end 3042 of the corrosion probe 304 through the detection port 305, allowing the monitoring and control board 302 to collect the downhole corrosion rate through the corrosion probe 304. The connector of the corrosion probe 304 and how the monitoring and control board 302 measures the corrosion rate through the corrosion probe 304 are existing technologies and are not the focus of this application. Since the equipment is fixed downhole along with the tubing 100, in order to upload the collected corrosion rate data to the surface, the monitoring and control board 302 has a wireless communication module or is connected to a cable extending to the surface, allowing the monitoring and control board 302 to upload the data via wireless or wired data transmission.

[0046] In some embodiments, the detection port 305 is located at the lower end of the inner shell 301, and multiple water-permeable holes 203 are located at the lower end of the cover 2. This structural design causes the measuring end 3042 of the corrosion probe 304 to face downwards, and the water-permeable holes 203 make the end of the cover 2 resemble a sieve plate, maintaining the protection of the measuring end 3042 of the corrosion probe 304 at the end of the monitoring mechanism 3 by the cover 2, avoiding damage to the corrosion probe 304 from huge impacts. At the same time, it allows some of the downhole fluid to seep into the cover 2 through the water-permeable holes 203, thereby making faster contact with the measuring end 3042 of the corrosion probe 304, and thus more sensitively monitoring the corrosion rate.

[0047] In some embodiments, the detection port 305 is a port at one end of the inner shell 301, which is filled with potting compound (not shown in the figures). The potting compound seals the detection port 305 so that the measuring end 3042 of the corrosion probe 304 is flush with or extends out of the potting compound. This structural design allows the potting compound to fill the inner shell 301, with the battery 303 and monitoring control board 302 both embedded in the inner wall of the potting compound, preventing short circuits caused by contact with downhole fluids. The port at the end of the inner shell 301 provides a larger opening, facilitating the installation of the battery 303 and monitoring control board 302. The corrosion probe 304 is directly fixed to the detection port 305 by potting compound, which not only facilitates installation but also meets the waterproofing requirements of the corrosion probe 304 except for the measuring end 3042.

[0048] In some embodiments, there are two clamps 1, which are respectively connected to the two ends of the housing 2, so that the two ends of the housing 2 are fixed to the oil pipe 100 by adjacent clamps 1, thereby improving the stability of the equipment fixed on the oil pipe 100.

[0049] In some embodiments, the clamp 1 includes two arc-shaped members 101. One end of the two arc-shaped members 101 is hinged together by a pin 102, and the other end of the two arc-shaped members 101 is connected by a connecting bolt 103. The connecting bolt 103 is detachable, so that when the connecting bolt 103 is removed, the two arc-shaped members 101 can be opened and the clamp 1 removed from the tubing 100; or when the connecting bolt 103 is installed, the two arc-shaped members 101 can be closed and tightly clamped onto the tubing 100 for fixation. At least one arc-shaped member 101 is provided with a cable passage portion 104 protruding away from the tubing, and the cable passage portion 104 forms a cable passage groove. This structural design allows the clamp 1 to constrain the downhole cable in the cable passage groove, so that the cable is as close as possible to the tubing 100, preventing the cable from deviating and contacting the well wall when the tubing 100 is lowered into the well, thus preventing cable wear. In addition, the outwardly protruding wire-passing portion 104 can serve as a reinforcing rib for the arc-shaped member 101, thereby improving the structural strength of the arc-shaped member 101 and enhancing the stability of the clamp 1 fixed to the oil pipe 100.

[0050] In some embodiments, the downhole corrosion monitoring device further includes an insulating buffer pad (not shown in the figures). The insulating buffer pad is fitted over the tubing 100, and at least one of the housing 2 and the monitoring mechanism 3 is in close contact with it, firmly pressing and securing it to the tubing 100. This structural design enhances the protection of the tubing 100, fills structural gaps, and improves the stability of the device installation through its inherent elasticity.

[0051] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A corrosion monitoring device for oil wells, characterized in that, include: Clamps are used to secure oil pipes. The cover is installed on the clamp; The monitoring device is installed inside the enclosure; The cover is used to be disposed on the axial direction of the oil pipe, and the side of the cover near the oil pipe is provided with a flow port; there are two covers, and the two covers are symmetrically disposed on both sides of the oil pipe.

2. The downhole corrosion monitoring equipment according to claim 1, characterized in that, The surface of the cover away from the oil pipe is a mating surface; all mating surfaces are arc surfaces and are located on the same circumference concentric with the oil pipe.

3. The downhole corrosion monitoring equipment according to claim 1, characterized in that, Both ends of the cover are arc-shaped.

4. The downhole corrosion monitoring equipment according to claim 1, characterized in that, The cover has an open structure on the side near the oil pipe, and the monitoring mechanism extends out of the cover on the side near the oil pipe.

5. The downhole corrosion monitoring equipment according to claim 1, characterized in that, The monitoring agencies include: The inner shell is installed inside the cover. The monitoring and control board is installed in the inner shell; The battery is installed in the inner casing and supplies power to the monitoring and control board. A corrosion probe is installed in the inner shell and electrically connected to the monitoring and control board; the inner shell has a detection port, and the measuring end of the corrosion probe extends into the detection port.

6. The downhole corrosion monitoring equipment according to claim 5, characterized in that, The detection port is located at the lower end of the inner shell, and multiple water-permeable holes are located at the lower end of the cover.

7. The downhole corrosion monitoring equipment according to claim 5, characterized in that, The detection port is a port at one end of the inner shell, and the inner shell is filled with potting compound; the potting compound seals the detection port so that the measuring end of the corrosion probe is flush with or extends out of the potting compound.

8. The downhole corrosion monitoring equipment according to claim 1, characterized in that, The clamp is two in number, and the two clamps are respectively connected to the two ends of the cover.

9. The downhole corrosion monitoring equipment according to claim 8, characterized in that, The clamp includes two arc-shaped parts; one end of the two arc-shaped parts is hinged together by a pin, and the other end of the two arc-shaped parts is connected together by a connecting bolt; at least one of the arc-shaped parts is provided with a wire passage portion protruding away from the oil pipe, and the wire passage portion forms a wire passage groove.

10. The downhole corrosion monitoring equipment according to claim 1, characterized in that, Further includes: An insulating buffer pad is used to cover the oil pipe; the housing and / or the monitoring mechanism are used to press and fix the insulating buffer pad onto the oil pipe.

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