Mechanical cement retainer, cement retainer setting tool and control device thereof

Abstract

This invention provides a mechanical cement retainer, a cement retainer setting tool, and its control device, belonging to the technical field of oil and gas well plugging tools. The control device includes a control center pipe, a positioning mechanism, a straightening mechanism, an upper connecting sleeve, and a lower connecting sleeve. The upper end of the control center pipe is connected to the tubing string, and the lower end is connected to the upper connector of the setting tool. The positioning mechanism includes a positioning key, and the control center pipe has a positioning groove. The upper connecting sleeve is equipped with a track pin, and the control center pipe has a long track groove, a short track groove, and a reversing groove. The lower connecting sleeve connects to the upper bushing of the setting tool. A mating structure is provided between the upper and lower connecting sleeves. The upper connecting sleeve has a stop-rotation position that keeps the track pin at the first upper dead point during the well running process, and simultaneously prevents rotation of the lower connecting sleeve in the circumferential direction through the mating structure. This prevents the straightening device of the setting tool from rotating relative to the setting center pipe, avoiding mid-running setting, eliminating the need for manual reverse rotation of the tubing string, saving time and effort, and providing convenient control.

Description

Technical Field

[0001] This invention relates to a mechanical cement retainer, a cement retainer setting tool, and a control device thereof, belonging to the technical field of oil and gas well plugging tools. Background Technology

[0002] To ensure the integrity of the gas seal when constructing gas storage facilities using depleted oil and gas reservoirs, it is necessary to seal old, unused oil and gas layers or abandoned wells within the block. Currently, the sealing of old or abandoned wells in domestic gas storage facilities mainly uses mechanical cement retainers, which consist of a cement retainer and a setting tool.

[0003] For example, Chinese utility model patent CN201065749Y discloses a cement retainer setting tool, and another example is a cement retainer disclosed in Chinese utility model patent CN203835327U. Mechanical cement retainers set by rotating and lifting the tubing string; their structure is as follows... Figure 1 As shown, the device includes a setting center tube 200 and a straightening device 400 sleeved outside the setting center tube 200. The setting center tube 200 has an upper end connector 100 at its upper end, and the straightening device 400 has an upper end bushing 300 at its upper end. The rotatability between the setting center tube 200 and the straightening device 400 is a necessary structural feature for the setting of the cement retainer. Due to this feature, mid-way setting often occurs during the cement retainer's insertion into the well, meaning that mid-way setting occurs because the setting center tube 200 and the straightening device 400 rotate. Therefore, during the cement retainer's insertion into the well, the setting center tube 200 and the straightening device 400 must not rotate. However, when the lifting system of the work machine is not properly operated, or when the well body is irregular, rotation will occur. When the rotation between the setting center tube 200 and the straightening device 400 exceeds a certain angle (10 turns), the upper slip 601 of the slip control sleeve 500 and the cement retainer 600 will separate. The upper slip 601 will be out of control and will be radially spread open on the inner wall of the casing under the elastic force of the inner spring. When the oil pipe is connected to a single line, the cement retainer will set midway when the lifting string is lifted.

[0004] Currently, dealing with mid-way setting usually requires re-running and milling the tubing string, which is labor-intensive and time-consuming. Another preventative measure is to manually rotate the tubing string in the opposite direction every 10-15 tubing segments during the cement retainer insertion process. This is labor-intensive, time-consuming, and ineffective. Summary of the Invention

[0005] The purpose of this invention is to provide a cement retainer setting tool control device to solve the problems of existing mechanical cement retainers easily setting midway during well insertion, and the time-consuming, labor-intensive, and ineffective manual reverse rotation of the tubing string using pipe wrenches. The invention also aims to provide a cement retainer setting tool to work in conjunction with the cement retainer setting tool control device to solve the above problems. Furthermore, the invention provides a mechanical cement retainer to solve the above problems.

[0006] To achieve the above objectives, the cement holder setting tool control device of the present invention adopts the following technical solution:

[0007] A cement retainer setting tool control device includes: a control center tube, a positioning mechanism sleeved outside the control center tube, a straightening mechanism, an upper connecting sleeve, and a lower connecting sleeve. The upper end of the control center tube is used to connect to the tubing string, and the lower end is used to connect to the upper end connector of the cement retainer setting tool. The positioning mechanism is located above the straightening mechanism and the two are fixedly connected. The positioning mechanism includes a key sleeve and a positioning key disposed inside the key sleeve for elastically pressing against the outer wall of the control center tube. The control center tube is provided with a positioning groove for the positioning key to be embedded to lock the positioning mechanism. The straightening mechanism includes a straightening body and a friction element installed on the straightening body for elastically pressing against the inner wall of the sleeve. The upper connecting sleeve is connected below the straightening mechanism and a track pin is installed on the upper connecting sleeve. The outer circumferential surface of the control center tube is provided with a long track groove and a short track groove for the track pin to be embedded, and a long track groove and a short track groove located below the long track groove and the short track groove. The reversing groove is used to switch the track pin between the long track groove and the short track groove when the control center pipe is lifted and lowered, so that the track pin has a first upper dead point position at the upper end of the short track groove and a second upper dead point position at the upper end of the long track groove. When the track pin is in the second upper dead point position, the positioning key is embedded in the positioning groove. The lower connecting sleeve is used to connect the upper bushing of the cement retainer setting tool. A mating structure for vertical guidance and circumferential anti-rotation is provided between the lower connecting sleeve and the upper connecting sleeve. The upper connecting sleeve has an anti-rotation position where the track pin is in the first upper dead point position during the cement retainer lowering process, and at the same time, it is in circumferential anti-rotation engagement with the lower connecting sleeve through the mating structure. The upper connecting sleeve also has a disengagement position where the track pin is switched to the second upper dead point position by lifting and lowering the tubing string after the cement retainer is in place, and at the same time, it disengages from the lower connecting sleeve.

[0008] The beneficial effects of the above technical solution are as follows: Since the upper end of the control center pipe is used to connect to the tubing string and the lower end is used to connect to the upper connector of the cement retainer setting tool, the control device can be connected to the cement retainer setting tool and run down the well along with the tubing string; since the lower connecting sleeve is used to connect to the upper bushing of the cement retainer setting tool, a connection is established between the lower connecting sleeve and the setting tool; and since the upper bushing is a component of the setting tool's centering device, a connection is established between the setting tool's centering device and the lower connecting sleeve of the control device; during the downhole process, the upper connecting sleeve is in an anti-rotation position, and the track on the upper connecting sleeve... The pin is located in the short track groove and at the first upper dead point. At the same time, the upper connecting sleeve is in anti-rotation engagement with the lower connecting sleeve in the circumferential direction through the mating structure. Therefore, the lower connecting sleeve cannot rotate relative to the upper connecting sleeve. Since the track pin is located in the short track groove on the outer circumference of the control center tube, the upper connecting sleeve cannot rotate relative to the control center tube. Thus, the purpose of preventing the setting tool's straightening device from rotating relative to the setting center tube and the control center tube is indirectly achieved. This can prevent the setting tool from setting midway. The control is very convenient and does not require manual reverse rotation of the pipe column with pipe wrenches. It solves the problems of time-consuming, labor-intensive and ineffective technology.

[0009] Once the cement retainer is in place, the lifting and lowering of the tubing column utilizes the reversing groove to switch the track pin to the long track groove and position it at the second top dead center. At this point, the positioning key in the positioning mechanism engages with the positioning groove of the control center tube, locking the positioning mechanism. Afterward, the positioning mechanism, straightening mechanism, track pin, and upper connecting sleeve can no longer move up or down relative to the control center tube. Furthermore, during the lifting of the tubing column and the initial stroke of the lowering stroke, the lower and upper connecting sleeves are guided vertically through a mating structure. Because the straightening mechanism is firmly supported against the inner wall of the sleeve, meaning the straightening mechanism, positioning mechanism, and upper connecting sleeve are fixed relative to the sleeve, the control center tube continuously moves downward relative to the straightening mechanism, positioning mechanism, and upper connecting sleeve during the lowering stroke. During the later stroke of the lowering stroke, the control center tube causes the lower connecting sleeve to disengage from the upper connecting sleeve, and finally, the positioning key engages with the positioning groove, placing the upper connecting sleeve in the disengaged position. Afterward, normal operation of the tubing column will achieve the setting and sealing of the cement retainer.

[0010] Furthermore, the friction element is a friction block, and the straightening mechanism also includes a first elastic element mounted between the friction block and the straightening body; the straightening body is provided with at least two mounting grooves with openings facing radially outward and used for mounting the friction block at intervals along the circumference, and the upper and lower ends of the friction block are respectively provided with retaining edges, and the upper and lower ends of the straightening body are respectively fixed with an upper pressure ring and a lower pressure ring that cooperate with the retaining edges to limit the friction block on the straightening body.

[0011] The beneficial effects of the above technical solution are as follows: the first elastic element facilitates the elastic pressing of the friction block against the inner wall of the sleeve; the installation groove on the straightening body facilitates the installation of the friction block; by setting baffles at the upper and lower ends of the friction block respectively, and fixing the upper pressure ring and the lower pressure ring at the upper and lower ends of the straightening body respectively, the friction block is limited on the straightening body in cooperation with the baffles, which can prevent the friction block from falling out and ensure a better performance.

[0012] Furthermore, the upper end of the upper connecting sleeve is provided with an annular boss, the track pin is installed on the annular boss, the annular boss is located below the straightening body, and the inner side of the lower pressure ring is provided with an upward-facing stepped surface for supporting the annular boss.

[0013] The beneficial effects of the above technical solution are as follows: the annular boss not only facilitates the installation of the track pin, but also enables the upper connecting sleeve to be connected to the lower part of the straightening mechanism by supporting it on the stepped surface inside the lower pressure ring, while also facilitating the relative rotation between the straightening mechanism and the upper connecting sleeve.

[0014] Furthermore, the lower pressure ring includes a limiting pin pressure ring threadedly connected to the straightening body and a retaining ring threadedly connected to the limiting pin pressure ring. The limiting pin pressure ring is stopped by the retaining edge at the lower end of the friction block. The stepped surface is provided on the retaining ring. The track pin is inserted into the annular boss. One end of the track pin is embedded in the long track groove or the short track groove, and the other end is located inside the limiting pin pressure ring and is stopped by the limiting pin pressure ring.

[0015] The beneficial effects of the above technical solution are as follows: the lower pressure ring is composed of a separate limiting pin pressure ring and a retaining ring, and the connection method is threaded connection, which is convenient for processing, manufacturing, installation and disassembly and maintenance; the track pin is inserted into the annular boss, which has a simple structure and is easy to install; one end of the track pin is embedded in the long track groove or the short track groove, and the other end is located inside the limiting pin pressure ring and is stopped by the limiting pin pressure ring, which can prevent the track pin from coming out.

[0016] Furthermore, the key sleeve is a one-piece sleeve structure, and the key sleeve is provided with a positioning key groove that extends radially for installing the positioning key. A pressure plate is also fixed on the key sleeve at the position corresponding to the positioning key groove.

[0017] The advantages of the above technical solution are: it facilitates the installation of the key sleeve, and the installation of the positioning key is also facilitated by setting the positioning key slot. The pressure plate fixed on the key sleeve can prevent the positioning key from falling out.

[0018] Furthermore, the positioning mechanism also includes a second elastic element mounted between the pressure plate and the positioning key.

[0019] The beneficial effects of the above technical solution are: it facilitates the elastic pressing of the outer wall of the control center tube, and it also facilitates the smooth insertion of the positioning key into the positioning groove when the control center tube moves down relative to the positioning mechanism.

[0020] Furthermore, the key sleeve is also provided with a pressure plate groove extending axially for mounting the pressure plate, and the pressure plate is mounted in the pressure plate groove by fixing screws.

[0021] The advantages of the above technical solution are as follows: the setting of the pressure plate groove facilitates the fixing of the pressure plate and also prevents the pressure plate from protruding; the pressure plate is installed in the pressure plate groove by fixing screws, which facilitates installation and disassembly.

[0022] Furthermore, the mating structure includes a mating groove disposed on the outer peripheral surface of the upper connecting sleeve and extending in the vertical direction, and the mating structure also includes a mating key fixed to the upper end of the lower connecting sleeve and matching the mating groove.

[0023] The advantages of the above technical solution are: it has a simple structure and is easy to process, manufacture and use.

[0024] To achieve the above objectives, the cement retainer setting tool of the present invention adopts the following technical solution:

[0025] A cement holder setting tool includes a setting center tube and an upper bushing sleeved outside the setting center tube. The upper end of the setting center tube is provided with an upper connector for connecting to the control center tube of the cement holder setting tool control device. The upper bushing is provided with a bushing connector for connecting to the lower connecting sleeve of the cement holder setting tool control device. The outer diameter of the upper connector is smaller than the outer diameter of the bushing connector, so that the lower connecting sleeve of the cement holder setting tool control device can pass through the upper connector to achieve connection with the bushing connector.

[0026] The beneficial effects of the above technical solution are as follows: The cement retainer setting tool provided by the present invention is used in conjunction with the cement retainer setting tool control device. The upper end of the setting center tube is provided with an upper end connector for connecting with the control center tube of the cement retainer setting tool control device, which can realize the connection between the cement retainer setting tool control device and the cement retainer setting tool control device, and facilitate the running of the cement retainer setting tool control device and the tubing together. At the same time, the upper bushing is provided with a bushing connector for connecting with the lower connecting sleeve of the cement retainer setting tool control device. The outer diameter of the upper end connector is smaller than the outer diameter of the bushing connector, so that the lower connecting sleeve of the cement retainer setting tool control device can pass through the upper end connector to achieve the connection with the bushing connector. In this way, when the control center tube of the cement retainer setting tool control device descends, the lower connecting sleeve and the cement retainer setting tool can descend synchronously, realizing the switching of the upper connecting sleeve of the cement retainer setting tool control device to the disengagement position, ensuring that the setting tool does not set midway during the running process, and does not affect the normal setting of the cement retainer after reaching the position.

[0027] To achieve the above objectives, the mechanical cement retainer of this invention adopts the following technical solution:

[0028] A mechanical cement retainer includes a cement retainer, a cement retainer setting tool, and a cement retainer setting tool control device. The cement retainer setting tool is connected above the cement retainer, and the cement retainer setting tool control device is connected above the cement retainer setting tool. The cement retainer setting tool includes a setting center tube and an upper bushing sleeved outside the setting center tube. The upper end of the setting center tube is provided with an upper connector for connecting to the control center tube of the cement retainer setting tool control device. The upper bushing is provided with a bushing for connecting to the lower connecting sleeve of the cement retainer setting tool control device. The upper connector has a smaller outer diameter than the bushing connector, allowing the lower connecting sleeve of the cement retainer setting tool control device to fit over the upper connector and connect with the bushing connector. The cement retainer setting tool control device includes: a control center tube, a positioning mechanism sleeved outside the control center tube, a straightening mechanism, an upper connecting sleeve, and a lower connecting sleeve. The upper end of the control center tube connects to the tubing string, and the lower end connects to the upper connector of the cement retainer setting tool. The positioning mechanism is located above the straightening mechanism and the two are fixedly connected. The positioning mechanism includes a key sleeve and a positioning key located inside the key sleeve for elastically pressing against the outer wall of the control center tube. The tube is provided with a positioning groove for a positioning key to be inserted to lock the positioning mechanism; the straightening mechanism includes a straightening body and a friction element mounted on the straightening body for elastically pressing against the inner wall of the sleeve; the upper connecting sleeve is connected to the lower part of the straightening mechanism and a track pin is installed on the upper connecting sleeve; the outer circumferential surface of the control center tube is provided with a long track groove, a short track groove, and a reversing groove located below the long track groove and the short track groove, respectively, for the track pin to be inserted; the reversing groove is used to switch the track pin between the long track groove and the short track groove when the control center tube is lifted and lowered, so that the track pin has a first upper dead point position at the upper end of the short track groove and a position in the long track groove. At the second upper dead point position, when the track pin is in the second upper dead point position, the positioning key is embedded in the positioning groove; the lower connecting sleeve is used to connect the upper bushing of the cement retainer setting tool. A mating structure for vertical guidance and circumferential anti-rotation is provided between the lower connecting sleeve and the upper connecting sleeve. The upper connecting sleeve has an anti-rotation position that allows the track pin to be in the first upper dead point position during the cement retainer's lowering process, and at the same time, it engages with the lower connecting sleeve in a circumferential anti-rotation position through the mating structure. The upper connecting sleeve also has a disengagement position that allows the track pin to switch to the second upper dead point position by lifting and lowering the tubing string after the cement retainer is in place, and at the same time, it disengages from the lower connecting sleeve.

[0029] The beneficial effects of the above technical solution are as follows: Since the upper end of the control center pipe is used to connect to the tubing string and the lower end is used to connect to the upper connector of the cement retainer setting tool, the control device can be connected to the cement retainer setting tool and run down the well along with the tubing string; since the lower connecting sleeve is used to connect to the upper bushing of the cement retainer setting tool, a connection is established between the lower connecting sleeve and the setting tool; and since the upper bushing is a component of the setting tool's centering device, a connection is established between the setting tool's centering device and the lower connecting sleeve of the control device; during the downhole process, the upper connecting sleeve is in an anti-rotation position, and the track on the upper connecting sleeve... The pin is located in the short track groove and at the first upper dead point. At the same time, the upper connecting sleeve is in anti-rotation engagement with the lower connecting sleeve in the circumferential direction through the mating structure. Therefore, the lower connecting sleeve cannot rotate relative to the upper connecting sleeve. Since the track pin is located in the short track groove on the outer circumference of the control center tube, the upper connecting sleeve cannot rotate relative to the control center tube. Thus, the purpose of preventing the setting tool's straightening device from rotating relative to the setting center tube and the control center tube is indirectly achieved. This can prevent the setting tool from setting midway. The control is very convenient and does not require manual reverse rotation of the pipe column with pipe wrenches. It solves the problems of time-consuming, labor-intensive and ineffective technology.

[0030] Once the cement retainer is in place, the lifting and lowering of the tubing column utilizes the reversing groove to switch the track pin to the long track groove and position it at the second top dead center. At this point, the positioning key in the positioning mechanism engages with the positioning groove of the control center tube, locking the positioning mechanism. Afterward, the positioning mechanism, straightening mechanism, track pin, and upper connecting sleeve can no longer move up or down relative to the control center tube. Furthermore, during the lifting of the tubing column and the initial stroke of the lowering stroke, the lower and upper connecting sleeves are guided vertically through a mating structure. Because the straightening mechanism is firmly supported against the inner wall of the sleeve, meaning the straightening mechanism, positioning mechanism, and upper connecting sleeve are fixed relative to the sleeve, the control center tube continuously moves downward relative to the straightening mechanism, positioning mechanism, and upper connecting sleeve during the lowering stroke. During the later stroke of the lowering stroke, the control center tube causes the lower connecting sleeve to disengage from the upper connecting sleeve, and finally, the positioning key engages with the positioning groove, placing the upper connecting sleeve in the disengaged position. Afterward, normal operation of the tubing column will achieve the setting and sealing of the cement retainer.

[0031] Furthermore, the friction element is a friction block, and the straightening mechanism also includes a first elastic element mounted between the friction block and the straightening body; the straightening body is provided with at least two mounting grooves with openings facing radially outward and used for mounting the friction block at intervals along the circumference, and the upper and lower ends of the friction block are respectively provided with retaining edges, and the upper and lower ends of the straightening body are respectively fixed with an upper pressure ring and a lower pressure ring that cooperate with the retaining edges to limit the friction block on the straightening body.

[0032] The beneficial effects of the above technical solution are as follows: the first elastic element facilitates the elastic pressing of the friction block against the inner wall of the sleeve; the installation groove on the straightening body facilitates the installation of the friction block; by setting baffles at the upper and lower ends of the friction block respectively, and fixing the upper pressure ring and the lower pressure ring at the upper and lower ends of the straightening body respectively, the friction block is limited on the straightening body in cooperation with the baffles, which can prevent the friction block from falling out and ensure a better performance.

[0033] Furthermore, the upper end of the upper connecting sleeve is provided with an annular boss, the track pin is installed on the annular boss, the annular boss is located below the straightening body, and the inner side of the lower pressure ring is provided with an upward-facing stepped surface for supporting the annular boss.

[0034] The beneficial effects of the above technical solution are as follows: the annular boss not only facilitates the installation of the track pin, but also enables the upper connecting sleeve to be connected to the lower part of the straightening mechanism by supporting it on the stepped surface inside the lower pressure ring, while also facilitating the relative rotation between the straightening mechanism and the upper connecting sleeve.

[0035] Furthermore, the lower pressure ring includes a limiting pin pressure ring threadedly connected to the straightening body and a retaining ring threadedly connected to the limiting pin pressure ring. The limiting pin pressure ring is stopped by the retaining edge at the lower end of the friction block. The stepped surface is provided on the retaining ring. The track pin is inserted into the annular boss. One end of the track pin is embedded in the long track groove or the short track groove, and the other end is located inside the limiting pin pressure ring and is stopped by the limiting pin pressure ring.

[0036] The beneficial effects of the above technical solution are as follows: the lower pressure ring is composed of a separate limiting pin pressure ring and a retaining ring, and the connection method is threaded connection, which is convenient for processing, manufacturing, installation and disassembly and maintenance; the track pin is inserted into the annular boss, which has a simple structure and is easy to install; one end of the track pin is embedded in the long track groove or the short track groove, and the other end is located inside the limiting pin pressure ring and is stopped by the limiting pin pressure ring, which can prevent the track pin from coming out.

[0037] Furthermore, the key sleeve is a one-piece sleeve structure, and the key sleeve is provided with a positioning key groove that extends radially for installing the positioning key. A pressure plate is also fixed on the key sleeve at the position corresponding to the positioning key groove.

[0038] The advantages of the above technical solution are: it facilitates the installation of the key sleeve, and the installation of the positioning key is also facilitated by setting the positioning key slot. The pressure plate fixed on the key sleeve can prevent the positioning key from falling out.

[0039] Furthermore, the positioning mechanism also includes a second elastic element mounted between the pressure plate and the positioning key.

[0040] The beneficial effects of the above technical solution are: it facilitates the elastic pressing of the outer wall of the control center tube, and it also facilitates the smooth insertion of the positioning key into the positioning groove when the control center tube moves down relative to the positioning mechanism.

[0041] Furthermore, the key sleeve is also provided with a pressure plate groove extending axially for mounting the pressure plate, and the pressure plate is mounted in the pressure plate groove by fixing screws.

[0042] The advantages of the above technical solution are as follows: the setting of the pressure plate groove facilitates the fixing of the pressure plate and also prevents the pressure plate from protruding; the pressure plate is installed in the pressure plate groove by fixing screws, which facilitates installation and disassembly.

[0043] Furthermore, the mating structure includes a mating groove disposed on the outer peripheral surface of the upper connecting sleeve and extending in the vertical direction, and the mating structure also includes a mating key fixed to the upper end of the lower connecting sleeve and matching the mating groove.

[0044] The advantages of the above technical solution are: it has a simple structure and is easy to process, manufacture and use. Attached Figure Description

[0045] Figure 1 This is a structural diagram of a mechanical cement retainer in the prior art;

[0046] Figure 2 for Figure 1 Structural diagram of the upper and middle end connector;

[0047] Figure 3 for Figure 1 Structural diagram of the upper and middle bushing;

[0048] Figure 4 This is a structural diagram of the mechanical cement retainer in this invention (the upper connecting sleeve is in the anti-rotation position);

[0049] Figure 5 This is a structural diagram of the mechanical cement retainer in this invention (the upper connecting sleeve is in the disengaged position);

[0050] Figure 6 This is an external view of the cement holder setting tool control device in this invention;

[0051] Figure 7 This is a cross-sectional view of the cement holder setting tool control device in this invention;

[0052] Figure 8 This is a structural diagram of the control center pipe in the cement holder setting tool control device of the present invention;

[0053] Figure 9 for Figure 7 Enlarged view of point A in the middle;

[0054] Figure 10 This is a structural diagram of the centering body in the cement holder setting tool control device of the present invention;

[0055] Figure 11 for Figure 7 A three-dimensional view of the structure at point B in the middle;

[0056] Figure 12 for Figure 7 Enlarged view of point C in the middle;

[0057] Figure 13 This is a structural diagram of the key sleeve in the cement holder setting tool control device of the present invention;

[0058] Figure 14 This is an assembly structure diagram of the cement holder setting tool and the cement holder in this invention;

[0059] Figure 15 for Figure 14 Structural diagram of the upper and middle end connector;

[0060] Figure 16 for Figure 14 Structural diagram of the upper and middle bushings.

[0061] In the diagram: 100, upper connector; 200, setting center tube; 300, upper bushing; 400, straightening device; 500, slip control sleeve; 600, cement retainer; 601, upper slip; 10, upper connector; 30, upper bushing; 31, bushing connector; 1, control center tube; 1-1, positioning groove; 1-2, long track groove; 1-3, short track groove; 1-4, reversing groove; 1-5, guide inclined wall; 2, upper connector; 3, positioning mechanism; 3-1, key sleeve; 3- 1-1. Positioning keyway; 3-1-2. Pressure plate groove; 3-2. Positioning key; 3-3. Pressure plate; 3-4. Fixing screw; 3-5. Second elastic element; 4. Straightening mechanism; 4-1. Straightening body; 4-1-1. Mounting groove; 4-2. Friction block; 4-3. First elastic element; 4-4. Upper pressure ring; 4-5. Limiting pin pressure ring; 4-6. Retaining ring; 5. Upper connecting sleeve; 5-1. Annular boss; 5-2. Mating groove; 6. Lower connecting sleeve; 6-1. Mating key; 7. Track pin. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0064] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0066] Example 1 of the mechanical cement retainer in this invention:

[0067] like Figure 4 and Figure 5 As shown, the mechanical cement retainer consists of three parts: a cement retainer 600, a cement retainer setting tool (hereinafter referred to as the setting tool), and a cement retainer setting tool control device (hereinafter referred to as the control device). The cement retainer 600 is identical to existing technology, and the setting tool is connected above the cement retainer 600 (e.g., ...). Figure 14 As shown, the control device is connected above the setting tool.

[0068] Specifically, in combination Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the control device includes: a control center tube 1, a positioning mechanism 3 sleeved outside the control center tube 1, a straightening mechanism 4, an upper connecting sleeve 5, and a lower connecting sleeve 6. The upper end of the control center tube 1 is used to connect to the tubing string, and the lower end is used to connect to the upper connector 10 of the setting tool (e.g., ...). Figure 14 As shown in the figure, an upper connector 2 is provided at the upper end of the control center pipe 1.

[0069] Positioning mechanism 3 is located above straightening mechanism 4, the two are fixedly connected and can rotate relative to control center tube 1, such as Figure 6 , Figure 9 and Figure 12 As shown, the positioning mechanism 3 includes a key sleeve 3-1 and a positioning key 3-2 disposed within the key sleeve 3-1 and used for elastically pressing and controlling the outer wall of the central tube 1, in conjunction with... Figure 13 As shown, the key sleeve 3-1 is an integral sleeve structure. The key sleeve 3-1 has a radially extending positioning keyway 3-1-1 for mounting the positioning key 3-2. A pressure plate 3-3 is fixed to the key sleeve 3-1 at a position corresponding to the positioning keyway 3-1-1. The key sleeve 3-1 also has an axially extending pressure plate groove 3-1-2 for mounting the pressure plate 3-3. The pressure plate 3-3 is mounted in the pressure plate groove 3-1-2 by fixing screws 3-4. The positioning mechanism 3 also includes a second elastic element 3-5 mounted between the pressure plate 3-3 and the positioning key 3-2. The second elastic element 3-5 is a coil spring, and the pressure plate 3-3 has a groove for the end of the coil spring to be inserted. There are two positioning keyways 3-1-1, and correspondingly, two positioning keys 3-2 and two pressure plates 3-3 are also provided. Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the control center tube 1 is provided with a positioning groove 1-1 for the positioning key 3-2 to be inserted to lock the positioning mechanism 3. The positioning groove 1-1 is located at the upper end of the control center tube 1 and is annular.

[0070] like Figure 6 and Figure 9 As shown, the straightening mechanism 4 includes a straightening body 4-1 and a friction element mounted on the straightening body 4-1 for elastically pressing against the inner wall of the sleeve. The straightening body 4-1 is welded and fixed to the key sleeve 3-1. In this embodiment, the friction element is a friction block 4-2. The straightening mechanism 4 also includes a first elastic element 4-3 mounted between the friction block 4-2 and the straightening body 4-1. The first elastic element 4-3 is a helical spring. The friction block 4-2 has a groove for the end of the helical spring to be inserted. Figure 10 As shown, the straightening body 4-1 has multiple mounting grooves 4-1-1 with openings facing radially outward and used for mounting friction blocks 4-2, spaced circumferentially. The upper and lower ends of the friction blocks 4-2 are respectively provided with retaining edges. The upper and lower ends of the straightening body 4-1 are respectively fixed with an upper pressure ring 4-4 ​​and a lower pressure ring that cooperate with the retaining edges to limit the friction blocks 4-2 on the straightening body 4-1. The upper pressure ring 4-4 ​​is welded and fixed to the straightening body 4-1.

[0071] like Figure 6 and Figure 9As shown, the lower pressure ring includes a pin-limiting pressure ring 4-5 threadedly connected to the straightening body 4-1 and a retaining ring 4-6 threadedly connected to the pin-limiting pressure ring 4-5. A retaining ring is provided at the upper end of the pin-limiting pressure ring 4-5, located outside the retaining edge at the lower end of the friction block 4-2, and engages with it for blocking. The upper connecting sleeve 5 is connected below the straightening mechanism 4, and a track pin 7 is installed on the upper connecting sleeve 5. Specifically, an annular boss 5-1 is provided at the upper end of the upper connecting sleeve 5, and the track pin 7 is inserted into the annular boss 5-1. The annular boss 5-1 has a pin hole and is located below the straightening body 4-1. The inner side of the retaining ring 4-6 has an upward-facing stepped surface for supporting the annular boss 5-1, thus enabling the upper connecting sleeve 5 to be connected below the straightening mechanism 4, and also facilitating relative rotation between the straightening mechanism 4 and the upper connecting sleeve 5.

[0072] like Figure 8 As shown, the outer circumference of the control center tube 1 is alternately provided with long track grooves 1-2 and short track grooves 1-3 for the track pins 7 to be inserted, as well as a reversing groove 1-4 located below the long track grooves 1-2 and short track grooves 1-3. One end of the track pin 7 is inserted into the long track groove 1-2 or the short track groove 1-3, as shown. Figure 9 As shown, the other end is located inside the pin limiting ring 4-5 and is engaged with the pin limiting ring 4-5 to prevent the track pin 7 from coming out.

[0073] like Figure 8 As shown, a guide inclined wall 1-5 is provided between the long track groove 1-2 and the short track groove 1-3. One side of the reversing groove 1-4 is an inclined groove wall, facing either the long track groove 1-2 or the short track groove 1-3, while the other side is a vertical groove wall, also facing the guide inclined wall 1-5. Therefore, the function of the reversing groove 1-4 is to switch the track pin 7 between the long track groove 1-2 and the short track groove 1-3 when the control center tube 1 is raised and lowered (this principle is the same as that of the Y211 packer known to those skilled in the art), so that the track pin 7 has a first upper dead point position at the upper end of the short track groove 1-3 and a second upper dead point position at the upper end of the long track groove 1-2. When the track pin 7 is at the second upper dead point position, the aforementioned positioning key 3-2 is just embedded in the positioning groove 1-1. Figure 5 (The state shown).

[0074] The sealing tool in this invention is basically the same as that in the prior art, such as... Figure 14As shown, the device includes a setting center tube 200, a straightening device 400 sleeved outside the setting center tube 200, and a slip control sleeve 500 located below the straightening device 400. The only differences from existing technologies are the upper end bushing 30 at the upper end of the straightening device 400 and the upper end connector 10 at the upper end of the setting center tube 200. In this invention, since the lower connecting sleeve 6 in the control device needs to connect with the upper end bushing 30, the lower connecting sleeve 6 must be able to fit over the upper end connector 10. Existing upper end connectors 100 (such as...) Figure 1 and Figure 2 The outer diameter of the lower connecting sleeve 6 is too large, so the present invention replaces it with an upper connector 10 (as shown) with a smaller outer diameter. Figure 14 and Figure 15 As shown), the upper connector 10 is threadedly connected to the lower end of the control center tube 1 of the control device. Meanwhile, due to the existing upper bushing 300 (as shown...), Figure 1 and Figure 3 (As shown) does not have a connecting structure, therefore, in this invention, the upper end of the upper bushing 30 is provided with a bushing connector 31 that is threadedly connected to the lower connecting sleeve 6 (as shown). Figure 16 As shown in the figure, of course, the outer diameter of the upper connector 10 is smaller than the outer diameter of the bushing connector 31 so that the lower connecting sleeve 6 can be fitted over the upper connector 10 to achieve connection with the bushing connector 31.

[0075] In this invention, a mating structure is provided between the lower connecting sleeve 6 and the upper connecting sleeve 5 for vertical guidance and circumferential anti-rotation, such as... Figure 11 As shown, the mating structure includes a mating groove 5-2 extending vertically on the outer circumferential surface of the upper connecting sleeve 5. The mating structure also includes a mating key 6-1 fixed to the upper end of the lower connecting sleeve 6 and matching the mating groove 5-2. The upper end of the lower connecting sleeve 6 has a slot, and the mating key 6-1 is welded and fixed within the slot. The mating key 6-1 can slide within the mating groove 5-2. The upper connecting sleeve 5 has an anti-rotation position that positions the track pin 7 at the first upper dead point during the cement retainer's lowering process, and simultaneously prevents rotation in the circumferential direction through the mating structure with the lower connecting sleeve 6. Figure 4 As shown), the upper connecting sleeve 5 also has a disengagement station that, after the cement retainer is in place, switches the track pin 7 to the second upper dead point position by lifting and lowering the pipe column, and simultaneously disengages it from the lower connecting sleeve 6. Figure 5 (As shown).

[0076] When assembling the mechanical cement retainer of the present invention, the cement retainer 600 is connected to the bottom of the setting tool, the straightening mechanism 4 is slid to the vicinity of the upper dead point of the long track groove 1-2, then the control center pipe 1 is threaded to the upper end connector 10 of the setting tool, the lower connecting sleeve 6 is threaded to the upper end bushing 30 of the setting tool, and finally the straightening mechanism 4 is slid to the upper end of the short track groove 1-3. During the well-running process, the upper end of the control center pipe 1 is connected to the tubing string, and the upper connecting sleeve 5 is in the anti-rotation position. The track pin 7 on the upper connecting sleeve 5 is located in the short track groove 1-3 and is in the first upper dead point position. At the same time, the upper connecting sleeve 5 is in anti-rotation engagement with the lower connecting sleeve 6 in the circumferential direction through the mating structure. Therefore, the lower connecting sleeve 6 cannot rotate relative to the upper connecting sleeve 5. Since the track pin 7 is located in the short track groove 1-3, the upper connecting sleeve 5 cannot rotate relative to the control center pipe 1. Thus, the purpose of preventing the setting tool's straightening device 400 from rotating relative to the setting center pipe 200 and the control center pipe 1 is indirectly achieved. This can prevent the setting tool from setting midway, realize the anti-missetting function, and the control is very convenient. It does not require manually rotating the tubing string in the opposite direction with pipe wrenches, which solves the problem of time-consuming, labor-intensive and ineffective technology.

[0077] Once the cement retainer 600 is in position, the lifting and lowering of the pipe column utilizes the reversing groove 1-4 to switch the track pin 7 into the long track groove 1-2 and place it at the second upper dead point. At this time, the positioning key 3-2 in the positioning mechanism 3 is precisely engaged in the positioning groove 1-1 of the control center pipe 1, thus locking the positioning mechanism 3. After this, the positioning mechanism 3, the straightening mechanism 4, the track pin 7, and the upper connecting sleeve 5 will no longer be able to move up or down relative to the control center pipe 1. Furthermore, during the lifting of the pipe column and the initial stroke of lowering the pipe column, the lower connecting sleeve 6 and the upper connecting sleeve 5 cooperate to... The structure guides and coordinates in the vertical direction. Because the friction block 4-2 of the straightening mechanism is held firmly against the inner wall of the casing by friction with the casing wall, meaning the straightening mechanism 4, positioning mechanism 3, and upper connecting sleeve 5 are fixed relative to the casing, during the lowering stroke of the tubing, the control center tube 1 continuously moves downwards relative to the straightening mechanism 4, positioning mechanism 3, and upper connecting sleeve 5. In the later stages of the lowering stroke, the control center tube 1 causes the lower connecting sleeve 6 to disengage from the upper connecting sleeve 5. Finally, the positioning key 3-2 engages in the positioning groove 1-1, and the upper connecting sleeve 5 is in the disengaged position, no longer having the anti-mis-seat function. Afterwards, by operating the tubing normally, the cement retainer 600 can be set.

[0078] It should be noted that during the well lowering process, when a single tubing is connected, the lifting height of the hoist should not exceed 500mm, that is, it should not exceed the length of the short track groove 1-3 (otherwise, when lowering it again, the track pin 7 may switch to the long track groove 1-2), to ensure that there is no relative rotation between the setting tool's straightening device 400 and the setting center tube 200, thereby preventing the cement retainer from setting midway.

[0079] Embodiment 2 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the mating groove in the mating structure is set on the lower connecting sleeve, while the mating key is set on the upper connecting sleeve.

[0080] Embodiment 3 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the mating structure is not in the form of a mating groove and a mating key. Instead, the inner hole of the lower connecting sleeve is set as a square hole, and the outer circumferential surface of the upper connecting sleeve is set as a square column. The upper connecting sleeve is inserted into the inner hole of the lower connecting sleeve to achieve vertical guidance and circumferential anti-rotation between the two.

[0081] Embodiment 4 of the mechanical cement retainer in this invention: Unlike embodiment 1, the key sleeve does not have a pressure plate groove, and the pressure plate is directly fixed to the key sleeve by fixing screws or welding.

[0082] Embodiment 5 of the mechanical cement retainer in this invention differs from Embodiment 1 in that the first elastic element and the second elastic element are both rubber blocks or spring sheets.

[0083] Embodiment 6 of the mechanical cement retainer in this invention: Unlike embodiment 1, the positioning mechanism does not include a second elastic element. In this case, the positioning key itself is elastic to achieve elastic pressure control of the outer wall of the central tube.

[0084] Embodiment 7 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the key sleeve is a two-part type. When the two parts are aligned and fixed, the positioning key is placed inside the key sleeve. At this time, there is no need to set the positioning key groove and pressure plate.

[0085] Embodiment 8 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the lower pressure ring is not formed by the threaded connection of the limiting pin pressure ring and the retaining ring, but is an integral piece.

[0086] Embodiment 9 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the track pin is not inserted into the annular boss, but is fixed below the annular boss, located below the straightening mechanism. In this case, the track pin can be directly welded or threaded to the upper connecting sleeve.

[0087] Embodiment 10 of the mechanical cement retainer in this invention: Unlike Embodiment 1, the upper end of the upper connecting sleeve does not have an annular boss. The upper connecting sleeve is connected to the lower part of the straightening mechanism in other ways and can rotate relative to the straightening mechanism, such as through bearings.

[0088] Embodiment 11 of the mechanical cement retainer in this invention: Unlike embodiment 1, the straightening mechanism does not include the first elastic element. In this case, the friction element itself is elastic. For example, in the straightening device of the prior art, a spring sheet is used as the friction element. In this case, there is no need to set the mounting groove on the straightening body.

[0089] The embodiment of the cement retainer setting tool in this invention is as follows: The specific structure of the cement retainer setting tool is the same as that of the setting tool in the mechanical cement retainer described above, and will not be repeated here.

[0090] The embodiment of the cement holder setting tool control device in this invention is as follows: The specific structure of the cement holder setting tool control device is the same as that of the control device in the above-mentioned mechanical cement holder, and will not be repeated here.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A cement holder setting tool control device, characterized in that, include: The control center pipe (1), the positioning mechanism (3) sleeved on the outside of the control center pipe (1), the straightening mechanism (4), the upper connecting sleeve (5) and the lower connecting sleeve (6), the upper end of the control center pipe (1) is used to connect the pipe column, and the lower end is used to connect the upper end connector (10) of the cement retainer setting tool; the positioning mechanism (3) is located above the straightening mechanism (4) and the two are fixedly connected, the positioning mechanism (3) includes a key sleeve (3-1) and a positioning key (3-2) set in the key sleeve (3-1) and used to elastically press the outer wall of the control center pipe (1 ... lower end is used to connect the upper end connector (1) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and the lower end is used to connect the upper end connector (10) of the control center pipe (1) and The positioning mechanism (3) is provided with a positioning groove (1-1) for the positioning key (3-2) to be inserted to lock the positioning mechanism (3); the straightening mechanism (4) includes a straightening body (4-1) and a friction element installed on the straightening body (4-1) for elastically pressing the inner wall of the sleeve; the upper connecting sleeve (5) is connected to the lower part of the straightening mechanism (4) and a track pin (7) is installed on the upper connecting sleeve (5); the outer circumferential surface of the control center tube (1) is provided with a long track groove (1-2), a short track groove (1-3) for the track pin (7) to be inserted, and a positioning groove (1-2) and a short track groove (1-3) located on the outer circumferential surface of the control center tube (1). 1-3) The reversing groove (1-4) below is used to switch the track pin (7) between the long track groove (1-2) and the short track groove (1-3) when the control center tube (1) is lifted and lowered, so that the track pin (7) has a first upper dead point position at the upper end of the short track groove (1-3) and a second upper dead point position at the upper end of the long track groove (1-2). When the track pin (7) is in the second upper dead point position, the positioning key (3-2) is embedded in the positioning groove (1-1); the lower connecting sleeve (6) is used to connect the cement holder setting tool. The upper bushing (30), the lower connecting sleeve (6) and the upper connecting sleeve (5) are provided with a mating structure for guiding up and down and preventing rotation in the circumferential direction. The upper connecting sleeve (5) has a rotation-prevention position that allows the track pin (7) to be in the first upper dead point position during the cement retainer (600) going down into the well, and at the same time, it is in a rotation-prevention position that is in a circumferential position with the lower connecting sleeve (6) through the mating structure. The upper connecting sleeve (5) also has a disengagement position that allows the track pin (7) to be switched to the second upper dead point position by lifting and lowering the tubing after the cement retainer (600) is in place, and at the same time, it is disengaged from the lower connecting sleeve (6).

2. The cement holder setting tool control device according to claim 1, characterized in that, The friction element is a friction block (4-2), and the straightening mechanism (4) also includes a first elastic element (4-3) mounted between the friction block (4-2) and the straightening body (4-1); the straightening body (4-1) is provided with at least two mounting grooves (4-1-1) with openings facing the radially outward and used for mounting the friction block (4-2) at intervals along the circumference; the upper and lower ends of the friction block (4-2) are respectively provided with retaining edges; the upper and lower ends of the straightening body (4-1) are respectively fixed with an upper pressure ring (4-4) and a lower pressure ring that cooperate with the retaining edges to limit the friction block (4-2) on the straightening body (4-1).

3. The cement holder setting tool control device according to claim 2, characterized in that, The upper end of the upper connecting sleeve (5) is provided with an annular boss (5-1), and the track pin (7) is installed on the annular boss (5-1). The annular boss (5-1) is located below the straightening body (4-1), and the inner side of the lower pressure ring is provided with an upward step surface for supporting the annular boss (5-1).

4. The cement holder setting tool control device according to claim 3, characterized in that, The lower pressure ring includes a pin limiting ring (4-5) threadedly connected to the straightening body (4-1) and a retaining ring (4-6) threadedly connected to the pin limiting ring (4-5). The pin limiting ring (4-5) is engaged with the retaining edge at the lower end of the friction block (4-2). The stepped surface is set on the retaining ring (4-6). The track pin (7) is inserted into the annular boss (5-1). One end of the track pin (7) is embedded in the long track groove (1-2) or the short track groove (1-3), and the other end is located inside the pin limiting ring (4-5) and engaged with the pin limiting ring (4-5).

5. The cement holder setting tool control device according to any one of claims 1 to 4, characterized in that, The key sleeve (3-1) is an integral sleeve structure. The key sleeve (3-1) is provided with a positioning key groove (3-1-1) extending radially for installing the positioning key (3-2). A pressure plate (3-3) is also fixed on the key sleeve (3-1) at the position corresponding to the positioning key groove (3-1-1).

6. The cement holder setting tool control device according to claim 5, characterized in that, The positioning mechanism (3) also includes a second elastic element (3-5) mounted between the pressure plate (3-3) and the positioning key (3-2).

7. The cement holder setting tool control device according to claim 5, characterized in that, The key sleeve (3-1) is also provided with a pressure plate groove (3-1-2) extending axially for mounting the pressure plate (3-3), and the pressure plate (3-3) is mounted in the pressure plate groove (3-1-2) by fixing screws (3-4).

8. The cement holder setting tool control device according to any one of claims 1 to 4, characterized in that, The mating structure includes a mating groove (5-2) provided on the outer peripheral surface of the upper connecting sleeve (5) and extending in the vertical direction. The mating structure also includes a mating key (6-1) fixed at the upper end of the lower connecting sleeve (6) and matching the mating groove (5-2).

9. A cement holder setting tool, comprising a setting center tube (200) and an upper end bushing (30) sleeved outside the setting center tube (200), characterized in that, It also includes a cement holder setting tool control device as described in any one of claims 1 to 8, wherein the upper end of the setting center tube (200) is provided with an upper end connector (10) that is connected to the control center tube (1) of the cement holder setting tool control device, and the upper end bushing (30) is provided with a bushing connector (31) that is connected to the lower connecting sleeve (6) of the cement holder setting tool control device. The outer diameter of the upper end connector (10) is smaller than the outer diameter of the bushing connector (31) so that the lower connecting sleeve (6) of the cement holder setting tool control device can be fitted over the upper end connector (10) to achieve connection with the bushing connector (31).

10. A mechanical cement retainer, comprising a cement retainer (600), characterized in that, It also includes the cement holder setting tool as described in claim 9, the cement holder setting tool being connected above the cement holder (600), and the cement holder setting tool control device being connected above the cement holder setting tool.

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