Sleeve anti-corrosion ball stabilizer

Abstract

The utility model discloses a casing pipe anti-corrosion ball stabilizer which comprises a stabilizer body, the stabilizer body is installed on a casing pipe, and the stabilizer body is provided with a sacrificial anode structure. The sacrificial anode structure comprises an active metal body, the stabilizer body is provided with an inner hollow groove and a charging hole, the active metal body is arranged in the inner hollow groove through the charging hole, and the active metal body in the inner hollow groove can be in contact with oil gas, so that the active metal body, the sleeve and the oil gas form a primary battery. The structure of an existing ball stabilizer is optimized, the active metal body is ingeniously implanted into the stabilizer body, the advantages of the existing ball stabilizer are guaranteed, the functions of the ball stabilizer are increased, a casing pipe is protected through the electrochemical effect, and the service life of an oil-string casing pipe is prolonged. According to the utility model, the requirement of smooth running of the casing of the shale gas long horizontal well is met, the casing is prevented from being corroded, the casing is effectively protected, and the service life of the casing is greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of cementing tools, and in particular relates to a casing anti-corrosion ball stabilizer. Background Art

[0002] At present, due to the increase in horizontal wells in drilling construction, and the long horizontal sections, some of which even reach more than 1,600 meters, when performing downhole casing operations, due to the long horizontal section, the casing encounters greater resistance during the lowering process, which often leads to the casing not being able to smoothly lower to the bottom of the well, especially in the last few hundred meters, the casing is easy to get stuck. The traditional method uses a mechanical method of smashing to help the casing lower, but this method has great safety hazards and is easy to damage the casing or the well wall. Sometimes this method cannot completely smash the casing to the bottom of the well. The existing technology uses stabilizers to effectively solve the problem of casing lowering. It can reduce the friction of the casing and improve the centering of the casing, and is widely used on site.

[0003] The ball stabilizer (centralizer) solves the problem of high friction resistance in the long horizontal section of shale gas well. It also plays a good role in the smooth lowering of the casing in the ultra-long horizontal section in combination with the rotating casing. It has a good application in deep shale gas wells. In the existing technology, most ball stabilizers simply solve the problems of maintaining a certain settling degree of the casing in the well and reducing friction resistance during the casing lowering process. The well completion casing generally takes several decades or longer to be lowered into the well, but acidic gas or other corrosive gases are often produced in the formation. The casing is easily corroded by the acidic gas or other corrosive gas, resulting in a reduced service life of the casing. Utility Model Content

[0004] The utility model aims to provide a sleeve anti-corrosion ball stabilizer, which is used to solve the above problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a casing anti-corrosion ball stabilizer, comprising a stabilizer body, the stabilizer body is installed on the casing, and the stabilizer body is provided with a sacrificial anode structure; the sacrificial anode structure comprises an active metal body, the stabilizer body is provided with an inner hollow groove and a loading port, the active metal body is loaded into the inner hollow groove through the loading port, and the active metal body in the inner hollow groove can contact with oil and gas, so that the active metal body, casing and oil and gas constitute a primary battery.

[0006] As an optional implementation of the above technical solution, a plurality of communication holes communicating with the inner hollow groove are opened on the surface of the stabilizer body, and the size of the communication holes is smaller than the size of the active metal body.

[0007] As an optional implementation of the above technical solution, the inner hollow groove is arranged in an annular shape at one end of the stabilizer body.

[0008] As an optional implementation of the above technical solution, the active metal body includes an active metal ball, and the active metal ball is movably arranged in the inner hollow groove.

[0009] As an optional implementation of the above technical solution, the material of the active metal ball is one of magnesium, magnesium alloy, zinc and zinc alloy.

[0010] As an optional implementation of the above technical solution, the charging port is equipped with a plugging head.

[0011] As an optional implementation of the above technical solution, the blocking head includes a blocking screw, and the blocking screw is threadedly connected to the stabilizer body.

[0012] As an optional implementation of the above technical solution, the stabilizer body includes a tubular body, a plurality of prisms are arranged on the outer wall of the tubular body, and balls are arranged on the prisms, and the balls protrude from the surface of the prisms.

[0013] As an optional implementation of the above technical solution, the prisms are obliquely arranged on the outer wall of the tubular body, and a guide groove is provided between two adjacent prisms.

[0014] As an optional implementation of the above technical solution, a strip-shaped mounting groove is provided on the surface of the prism, and a plurality of balls are provided in the strip-shaped mounting groove.

[0015] As an optional implementation of the above technical solution, the tubular body and the prism are integrally formed.

[0016] As an optional implementation of the above technical solution, the ball is made of wear-resistant and corrosion-resistant material.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides a casing anti-corrosion ball stabilizer, which optimizes the structure of the existing ball stabilizer, ingeniously implants the active metal body into the stabilizer body, not only ensures the advantages of the existing ball stabilizer, but also increases the function of the ball stabilizer, uses the electrochemical effect to protect the casing, and prolongs the service life of the oil layer casing. The utility model not only meets the need for smooth lowering of the casing of a shale gas long horizontal well, but also avoids the corrosion of the casing, the casing is effectively protected, and the service life of the casing is greatly extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a sleeve anti-corrosion ball stabilizer in one embodiment of the utility model;

[0020] Figure 2It is a top view of a sleeve anti-corrosion ball stabilizer in one embodiment of the utility model.

[0021] In the figure: 1-stabilizer body; 2-connecting hole; 3-sealing head; 4-tubular body; 5-prism; 6-ball; 7-guide groove. DETAILED DESCRIPTION

[0022] like Figure 1 and Figure 2 As shown, this embodiment provides a casing anti-corrosion ball stabilizer, including a stabilizer body 1, wherein the stabilizer body 1 is mounted on the casing, and the stabilizer body 1 is provided with a sacrificial anode structure. The stabilizer body 1 is sleeved on the casing and can be reinforced by screws. The sacrificial anode structure, the casing and the oil and gas constitute a galvanic cell, which utilizes the sacrificial anode protection cathode method, also known as the sacrificial anode protection method, which is a method for preventing metal corrosion, that is, a metal with strong reducing properties is used as an anode, which is connected to the protected metal to form a galvanic cell. The metal with strong reducing properties will be consumed by oxidation reaction as the anode, and the protected metal can be used as the cathode to avoid corrosion, thereby realizing the anti-corrosion function of the casing.

[0023] The sacrificial anode structure includes an active metal body. The stabilizer body 1 is provided with an inner hollow groove and a charging port. The active metal body is loaded into the inner hollow groove through the charging port, and the active metal body in the inner hollow groove can contact with oil and gas, so that the active metal body, the casing and the oil and gas form a primary battery. The active metal body is consumed by oxidation reaction as an anode, and the protected casing can be used as a cathode to avoid corrosion. Since the active metal body is loaded into the inner hollow groove through the charging port, different active metal bodies can be selected according to different environmental needs, which is more flexible and convenient to use.

[0024] The utility model optimizes the structure of the existing ball stabilizer, and ingeniously implants the active metal body into the stabilizer body 1, which not only ensures the advantages of the existing ball stabilizer, but also increases the function of the ball stabilizer, and uses the electrochemical effect to protect the casing, thereby extending the service life of the oil layer casing. The utility model not only meets the need for the smooth lowering of the casing of the shale gas long horizontal well, but also avoids the corrosion of the casing, and the casing is effectively protected, greatly extending the service life of the casing.

[0025] like Figure 2 As shown, in a specific embodiment, the surface of the stabilizer body 1 is provided with a plurality of connecting holes 2 connected with the inner hollow groove, the size of the connecting holes 2 is smaller than the size of the active metal body, the active metal body will not be separated, and the oil and gas can enter the inner hollow groove through the connecting holes 2 and contact the active metal body. The inner hollow groove is arranged in an annular shape at one end of the stabilizer body 1, a circle of active metal bodies is loaded in the inner hollow groove, and a plurality of connecting holes 2 are evenly arranged at the end of the stabilizer body 1, so that the active metal body, the sleeve and the oil and gas form a primary battery.

[0026] In a specific embodiment, the active metal body includes an active metal ball, and the active metal ball is movably arranged in the inner hollow groove. It should be noted that the active metal body can be designed into different shapes as needed. The present utility model designs the active metal body into an active metal ball to facilitate the loading of the active metal ball. The material of the active metal ball is one of magnesium, magnesium alloy, zinc and zinc alloy.

[0027] like Figure 2 As shown, in this embodiment, the charging port is equipped with a plugging head 3. The plugging head 3 blocks the charging port to prevent the active metal ball from escaping from the inner hollow groove. Specifically, the plugging head 3 includes a plugging screw, which is threadedly connected to the stabilizer body 1. The inner wall of the charging port is provided with an internal thread, and the plugging screw extends into the charging port to block the charging port, which facilitates the replacement of the active metal ball.

[0028] like Figure 1 As shown, in a specific embodiment, the stabilizer body 1 includes a tubular body 4, a plurality of prisms 5 are provided on the outer wall of the tubular body 4, the plurality of prisms 5 are evenly arranged on the outer wall of the tubular body 4, the tubular body 4 and the prisms 5 are integrally formed, each prism 5 is provided with a ball 6, and the ball 6 protrudes from the surface of the prism 5.

[0029] The prisms 5 are vertically or obliquely arranged on the outer wall of the tubular body 4, and a guide groove 7 is arranged between two adjacent prisms 5. Figure 1 As shown, in this embodiment, the prism 5 is tiltedly arranged on the outer wall of the tubular body 4, and a guide groove 7 is formed between the prisms 5 to allow the fluid to pass through, so that the product can better reduce the resistance during use, and improve the practicality of the product. In the utility model, the tubular body 4 is a rigid structure, the prism 5 is a straight bar or a spiral bar, and each prism 5 is installed with a ball 6, which is made of alloy steel after heat treatment; the casing anti-corrosion ball stabilizer is mainly used for straightening the casing in a highly deviated well or a horizontal well. The casing anti-corrosion ball stabilizer can clear the wellbore and improve the displacement efficiency. The low torque and low friction resistance can realize the rotation operation and the lifting and lowering construction, which greatly improves the slurry replacement effect and the cementing operation quality.

[0030] In a specific embodiment, the surface of the prism 5 is provided with a strip-shaped mounting groove, and a plurality of balls 6 are arranged in the strip-shaped mounting groove. The balls 6 can move in any direction when rolling, which can well reduce the friction resistance during the casing lowering process, help the casing to be smoothly lowered to the target position, make the product more flexible during use, and reduce the difficulty of using the product. Preferably, the balls 6 are made of wear-resistant and corrosion-resistant materials, which can make the balls 6 more adaptable to harsh working environments and improve their service life and reliability.

[0031] The utility model installs a stabilizer body 1 on the casing to replace the traditional casing stabilizer, plays the role of centering the cementing casing, utilizes the anode sacrificial method to protect the casing from corrosion in advance, and prolongs the service life of the casing. It can greatly reduce the friction between the stabilizer body 1 and the well wall, thereby reducing the difficulty of lowering the casing. When encountering an obstacle during the casing lowering process, the casing can be easily rotated to allow the obstacle to pass through the guide groove 7 between the two prisms 5, thereby reducing the probability of the casing being blocked during the lowering process, reducing the difficulty of using the product, improving the efficiency of casing lowering, avoiding the use of mechanical methods to lower, and improving the safety of use.

[0032] In the description of the present utility model, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. In the absence of mutual contradictions, those skilled in the art may combine the features of different embodiments. The scope of protection of the present utility model is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present utility model, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the scope of protection of the present utility model.

Claims

1. A sleeve anti-corrosion ball stabilizer, comprising a stabilizer body (1), wherein the stabilizer body (1) is mounted on the sleeve, and characterized in that: The stabilizer body (1) is provided with a sacrificial anode structure; the sacrificial anode structure comprises an active metal body, the stabilizer body (1) is provided with an inner hollow groove and a charging port, the active metal body is loaded into the inner hollow groove through the charging port, and the active metal body in the inner hollow groove can contact with oil and gas, so that the active metal body, the sleeve and the oil and gas form a primary battery.

2. The sleeve anti-corrosion ball stabilizer according to claim 1, characterized in that: The surface of the stabilizer body (1) is provided with a plurality of communication holes (2) connected to the inner hollow groove, and the size of the communication holes (2) is smaller than the size of the active metal body.

3. The casing anti-corrosion ball stabilizer according to claim 1, characterized in that: The inner hollow groove is arranged in an annular shape at one end of the stabilizer body (1).

4. The casing anti-corrosion ball stabilizer according to claim 1, characterized in that: The active metal body includes an active metal ball, and the active metal ball is movably arranged in the inner hollow groove.

5. The casing anti-corrosion ball stabilizer according to claim 4, characterized in that: The active metal ball is made of one of magnesium, magnesium alloy, zinc and zinc alloy.

6. The casing anti-corrosion ball stabilizer according to claim 1, characterized in that: The charging port is provided with a plugging head (3).

7. The casing anti-corrosion ball stabilizer according to claim 6, characterized in that: The plugging head (3) comprises a plugging screw, and the plugging screw is threadedly connected to the stabilizer body (1).

8. The casing anti-corrosion ball stabilizer according to claim 1, characterized in that: The stabilizer body (1) comprises a tubular body (4), a plurality of prisms (5) are arranged on the outer wall of the tubular body (4), a ball (6) is arranged on the prism (5), and the ball (6) protrudes from the surface of the prism (5).

9. The casing anti-corrosion ball stabilizer according to claim 8, characterized in that: The prisms (5) are arranged obliquely on the outer wall of the tubular body (4), and a guide groove (7) is provided between two adjacent prisms (5).

10. The casing anti-corrosion ball stabilizer according to claim 9, characterized in that: The surface of the prism (5) is provided with a strip-shaped installation groove, and a plurality of balls (6) are arranged in the strip-shaped installation groove; the tubular body (4) and the prism (5) are integrally formed; and the balls (6) are made of wear-resistant and corrosion-resistant material.

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