Mixing method for sealing rubber barrel of high-temperature-resistant packer

Abstract

A high-temperature-resistant packer sealing rubber barrel mixing method comprises the steps that half of a mixed raw material is put into an internal mixer to be mixed, the mixed raw material is composed of tetrafluoroethylene-propylene rubber, carbon black, graphene and calcium stearate, the initial temperature of an internal mixing chamber is 40-60 DEG C, the rotating speed of a rotor is 35-50 r / min, and mixing is conducted for 2-3.5 min; the other half of the mixed raw materials are put into an internal mixer for mixing, the temperature is controlled to be 120 DEG C or below, the rubber turning frequency is 2-3 times, and mixing is conducted for 5-8 min; transferring the mixed rubber material to a specified place for cooling; the cooled rubber material is put into a preheated open mill for mixing, a vulcanizing agent and a vulcanizing aid are added during mixing, and after open mixing is completed and cooling is conducted, the vulcanization forming raw material is obtained. By adopting the method, the mixing effect is improved, manpower is liberated, and the continuous working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a packer sealing rubber cylinder, and particularly to a mixing method for a high-temperature resistant packer sealing rubber cylinder. Background Art

[0002] As an important downhole tool in oilfield and gas field drilling and production processes, a packer is used to seal the annular space between the tubing and the casing of an oil and gas well. In practical applications, the final sealing is achieved by the deformation of the sealing rubber cylinder on the packer, which acts on the inner wall of the casing to achieve sealing.

[0003] In the preparation of the sealing rubber cylinder, in order to obtain high-temperature resistant properties, it is necessary to improve the material component ratio and at the same time improve the mixing process, especially to control the mixing uniformity and time. At present, generally, a combination of an internal mixer process and an open mill process is used to complete the mixing. During open milling, it is necessary to scrape up the rubber compound that is flipped up by one of the rollers, and when a certain amount is collected, it is put back into the feeding ports of the two rollers of the open mill again for rolling and mixing. At present, this method mostly uses manual operation, which is time-consuming and laborious and requires continuous work, so it is necessary to be improved. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the related prior art, the present invention provides a mixing method for a high-temperature resistant packer sealing rubber cylinder, which mixes through two processes of internal mixing and open milling. At the same time, the internal mixing step is carried out in two steps, which improves the mixing effect. At the same time, during the open milling step, the rubber compound that is flipped up by one of the rollers is automatically scraped up, temporarily collected by an arc-shaped limiting frame, and after a predetermined time, the limit is released and it is sent into the feeding ports of the two rollers of the open mill, liberating manual labor and improving the continuous working efficiency.

[0005] In order to achieve the object of the present invention, the following scheme is proposed: A mixing method for a high-temperature resistant packer sealing rubber cylinder, characterized by including the steps of: Put half of the mixed raw materials into an internal mixer for mixing. The mixed raw materials are composed of tetrapropyl fluoride rubber, carbon black, graphene, and calcium stearate. The initial temperature of the internal mixer chamber is 40°C to 60°C, the rotor speed is 35 r / min to 50 r / min, and the mixing time is 2 min to 3.5 min. At this time, the temperature of the internal mixer chamber has risen; Put the other half of the mixed raw materials into the internal mixer, control the temperature below 120°C, the number of times of turning the rubber is 2 to 3 times, and the mixing time is 5 min to 8 min; Transfer the mixed rubber compound to a designated place for cooling; The cooled rubber material is put into the preheated open mill for mixing, and the vulcanizing agent and vulcanizing accelerator are added during mixing. The open mill includes a pair of rollers that rotate towards each other and toward the middle. The distance between the pair of rollers is adjustable. During the open milling process, the material that is turned up with the rollers and attached to the surface of the rollers is continuously peeled off and scraped off to separate from the rollers, and the material scraped by the glass is temporarily collected. After the rollers rotate for a predetermined number of times, the collected material is put into the feeding port of the open mill again, and this is repeated several times until the open milling is completed; After cooling, the vulcanized molding raw material that can be used for vulcanization molding of high temperature resistant packer sealing rubber cylinder is obtained.

[0006] Furthermore, an arc-shaped scraper and an arc-shaped limit plate are provided above one of the roller bodies; the two ends of the arc-shaped scraper are respectively connected to a lifting mechanism through a vertical rod, and the lower end of the arc-shaped scraper is used to scrape up the rubber material that turns up with the roller body when the arc-shaped scraper is lowered to fit the surface of the roller body; the upper end of the arc-shaped limit plate is connected to a cross bar, and the two ends of the cross bar are rotatably matched with the upper cross frame, and one end of the cross bar is rotatably matched with a rotating motor, and the rotating motor is fixed to the upper cross frame. The arc-shaped limit plate protrudes toward the middle direction of the pair of roller bodies, and the lower end of the arc-shaped limit plate is used to receive the scraped rubber material from the upper end of the arc-shaped scraper.

[0007] Furthermore, the arc scraper is located above the track of the rubber material turning up with the roller body, and the arc of the bottom surface of the arc scraper matches the circumferential surface of the roller body. When the arc scraper is lowered to fit the surface of the roller body, the lower end of the arc scraper is located at half the height of the roller body.

[0008] Furthermore, the arc-shaped limit plate is in the form of a semicircular arc, and includes a plurality of arc-shaped limit plates arranged in an array along the length direction of the crossbar, and the upper ends of the arc-shaped limit plates are all connected.

[0009] Furthermore, the two ends of the upper horizontal frame are connected to a pair of horizontal linear mechanisms, the travel direction of the horizontal linear mechanisms is perpendicular to the length direction of the roller body, and is used to drive the upper horizontal frame to move.

[0010] Furthermore, the horizontal linear mechanism adopts a screw motor assembly.

[0011] Furthermore, the rollers are all arranged on the rotating seat by rotation, and are all connected with a motor and a heater, the motor is used to drive the rollers to rotate, the heater is used to heat the rollers, and the rotating seat is arranged on the side rail seat.

[0012] Furthermore, the bottom of the rotating seat corresponding to one of the roller bodies slides in the slide groove of the side rail seat, the length direction of the slide groove is consistent with the length direction of the side rail seat, and is perpendicular to the length direction of the roller body. The side rail seat is provided with an adjustment motor and a screw seat, which are respectively located at both ends of the slide groove. The output shaft of the adjustment motor is connected to a screw, and the screw thread passes through the rotating seat and rotates to fit the screw seat.

[0013] Furthermore, the lifting mechanism is a lifting cylinder fixed on the side rail seat. ​

[0014] The beneficial effects of the present invention are as follows: 1. By mixing through two processes of internal mixing and open mixing, and simultaneously performing the internal mixing step in two steps, the mixing effect is improved. 2. Automatically scrape up the rubber compound that flips up with one of the rollers and temporarily store it using an arc-shaped limiting frame. After a predetermined time, release the limit and feed it into the feeding port of the two rollers of the open mill, liberating manual labor and improving the continuous working efficiency. 3. Utilize a liftable arc-shaped scraper to conveniently scrape up the colloid in a fitting manner, and use the force of the colloid rotating with the roller body to move along the back of the scraper, gradually curl and store it in the arc-shaped limiting plate. After a certain time, open the arc-shaped limiting plate by rotating and move the arc-shaped limiting plate towards the middle of the two rollers to realize the re-feeding of the scraped-up colloid; after completion, this operation can be repeated cyclically, greatly improving the efficiency of this process. Description of the Drawings

[0015] Figure 1 It is a flowchart of an embodiment of the present application.

[0016] Figure 2 It is a three-dimensional view of the open mill of an embodiment of the present application.

[0017] Figure 3 It is another three-dimensional view of the open mill of an embodiment of the present application from a different perspective.

[0018] Figure 4 It is a side view of the open mill of an embodiment of the present application. Detailed Embodiment

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following describes the embodiments of the present invention in detail with reference to the drawings. However, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0020] An embodiment of the present application provides a method for mixing a high-temperature packer sealing rubber cylinder, as Figure 1 shown, including the following steps: The first step is to put half of the mixed raw materials into an internal mixer for mixing. The mixed raw materials are composed of tetrapropyl fluororubber, carbon black, graphene, and calcium stearate. Specifically, the mass fractions of each raw material are: 100 parts of tetrapropyl fluororubber, 45 parts of carbon black, 1 part of calcium stearate, and 10 parts of graphene. The initial temperature of the internal mixer is 40°C to 60°C, the rotor speed is 35 r / min to 50 r / min, and the mixing is carried out for 2 min to 3.5 min. At this time, the temperature of the internal mixer has increased.

[0021] In the second step, put the other half of the mixed raw materials into the internal mixer, control the temperature below 120℃, turn the rubber over 2 to 3 times, and mix for 5 to 8 minutes.

[0022] The third step is to transfer the mixed rubber to a designated place for cooling.

[0023] The fourth step is to put the cooled rubber into the preheated open mill for mixing. Vulcanizer and vulcanizing accelerator are added during mixing. The open mill includes a pair of rollers that rotate towards each other and toward the middle. The distance between the pair of rollers is adjustable. During the open milling process, the material that is turned up by the rollers and attached to the surface of the rollers is continuously peeled off and scraped off to separate from the rollers. The material scraped up by the glass is temporarily collected. After the rollers rotate a predetermined number of times, the collected material is put into the feeding port of the open mill again. This is repeated several times until the open milling is completed.

[0024] The fourth step is to obtain the vulcanized raw material that can be used for vulcanization molding of the high temperature resistant packer sealing rubber cylinder after cooling.

[0025] Generally, when the open mill is in the process of mixing, colloid will be attached to one of the rollers, which needs to be manually scraped and put into the feed port between the two rollers for rolling and mixing again. Generally, it needs to be scraped and put in multiple times, and then after reaching the predetermined mixing degree, the colloid attached to the roller is drawn out to complete the mixing. At present, this process section is basically operated manually. In view of this, the open mill used in the fourth step of the embodiment of the present application is as follows Figures 2 to 4 As shown in , it includes a pair of roller bodies 1, which rotate towards each other and toward the middle. The roller bodies 1 are both arranged on the rotating seat 12 by rotation, and are both connected with a motor and a heater. The motor is used to drive the roller body 1 to rotate, and the heater is used to heat the roller body 1. The rotating seat 12 is arranged on the side rail seat 10.

[0026] The spacing between a pair of roller bodies 1 is adjustable. Specifically, the bottom of the rotating seat 12 corresponding to one of the roller bodies 1 slides in the slide groove 11 of the side rail seat 10. The length direction of the slide groove 11 is consistent with the length direction of the side rail seat 10 and is perpendicular to the length direction of the roller body 1. The side rail seat 10 is provided with an adjustment motor 13 and a screw seat 15, which are respectively located at both ends of the slide groove 11. The output shaft of the adjustment motor 13 is connected to a screw 14, which is threaded through the rotating seat 12 and rotates to fit the screw seat 15. Specifically, the thickness formed by rolling can be adjusted in actual situations through the adjustable spacing.

[0027] Generally, the speed and temperature of the two rollers 1 are controlled differently, so that the colloid will adhere to one of the rollers 1 and turn over. An arc scraper 2 and an arc limit plate 3 are provided above the roller 1 that turns over.

[0028] Both ends of the arc-shaped scraping plate 2 are respectively connected with a lifting mechanism 22 through a vertical rod 21. The lifting mechanism 22 is a lifting cylinder and is fixed on the side rail seat 10. The lower end of the arc-shaped scraping plate 2 is used to scrape up the rubber material that turns up with the roller 1 when the arc-shaped scraping plate 2 descends to fit the surface of the roller 1. Specifically, the arc-shaped scraping plate 2 is located above the trajectory where the rubber material turns up with the roller 1. The arc of the bottom surface of the arc-shaped scraping plate 2 matches the circumferential surface of the roller 1. When the arc-shaped scraping plate 2 descends to fit the surface of the roller 1, the lower end of the arc-shaped scraping plate 2 is located at half of the height of the roller 1.

[0029] Both upper ends of the arc-shaped limiting plates 3 are connected with a cross bar 31. Both ends of the cross bar 31 are rotatably matched with the upper cross frame 30, and one end of the cross bar 31 is rotatably matched with a rotating motor 32. The rotating motor 32 is fixed on the upper cross frame 30. The arc-shaped limiting plates 3 protrude towards the middle direction of a pair of rollers 1. The lower ends of the arc-shaped limiting plates 3 are used to receive the scraped-up rubber material from the upper ends of the arc-shaped scraping plates 2. Specifically, in this example, the arc-shaped limiting plates 3 are semi-circular arcs, including multiple ones, arranged in an array along the length direction of the cross bar 31, and the upper ends are all connected with the arc-shaped limiting plates 3.

[0030] Both ends of the upper cross frame 30 are connected to a pair of horizontal linear mechanisms 4. The stroke direction of the horizontal linear mechanisms 4 is perpendicular to the length direction of the roller 1 and is used to drive the upper cross frame 30 to move. The horizontal linear mechanisms 4 adopt screw motor assemblies.

[0031] During application, it operates in the way of a conventional open mill. The mixed rubber after the internal mixing process is put into the feeding ports of a pair of rollers 1 of the open mill, that is, above the middle part of a pair of rollers 1. During the rotation of the roller 1, the rubber material attached to one of the rollers 1 turns up with the roller 1. The arc-shaped scraping plate 2 is lowered in advance through the lifting cylinder, so that the lower part of the arc-shaped scraping plate 2 fits the roller 1. When the colloid flips to the arc-shaped scraping plate 2, it will be scraped up to the back of the arc-shaped scraping plate 2 under the action of the lower end of the arc-shaped scraping plate 2. As the roller 1 continues to rotate, the scraped-up colloid continues to move towards the middle along the back of the arc-shaped scraping plate 2 and is limited at the arc-shaped limiting plate 3 and moves along the arc of the arc-shaped limiting plate 3, and gradually curls in the area defined by the arc-shaped limiting plate 3. When the scraping of the colloid for one circle of the roller 1 is almost completed, the arc-shaped scraping plate is lifted by the lifting cylinder 22. At the same time, the arc-shaped limiting plate 3 is rotated upwards by using the rotating motor 32, and at the same time, the upper cross frame 30 is driven to move towards the feeding port of the roller 1 by using the horizontal linear mechanism 4, so as to realize putting the scraped-up, temporarily collected and curled colloid into the feeding port again. Then, after a preset time interval, the above operation is carried out again. It is executed cyclically until the mixing requirement of the open mill is met. Instead of scraping up, the colloid is introduced for the subsequent process.

[0032] The above are only the preferred embodiments of the present invention and do not represent the only ones or limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A high temperature resistant packer sealing rubber tube mixing method, characterized in that: Includes steps: Put half of the mixed raw materials into an internal mixer for mixing, wherein the mixed raw materials consist of tetrafluoroethylene rubber, carbon black, graphene, and calcium stearate, the initial temperature of the internal mixer is 40°C to 60°C, the rotor speed is 35r / min to 50r / min, and the mixing is performed for 2min to 3.5min, at which time the temperature of the internal mixer has risen; Put the other half of the mixed raw materials into the internal mixer, control the temperature below 120℃, turn the rubber over 2 to 3 times, and mix for 5 to 8 minutes; Transfer the mixed rubber to a designated place for cooling; The cooled rubber material is put into a preheated open mill for mixing, and a vulcanizing agent and a vulcanizing auxiliary agent are added during mixing. The open mill comprises a pair of roller bodies (1) which rotate towards each other and toward the middle, and the distance between the pair of roller bodies (1) is adjustable. During the mixing process, the material that is turned up by the roller bodies (1) and attached to the surface of the roller bodies (1) is continuously peeled off and scraped off so that it is separated from the roller bodies (1), and the material scraped off by the glass is temporarily collected. After the roller bodies (1) rotate for a predetermined number of times, the collected material is again put into the feeding port of the open mill, and this process is repeated several times until the mixing is completed; After cooling, a vulcanization molding raw material which can be used for vulcanization molding of a high temperature resistant packer sealing rubber cylinder is obtained.

2. The high temperature resistant packer sealing rubber mixing method according to claim 1, characterized in that: An arc-shaped scraper (2) and an arc-shaped limit plate (3) are provided above one of the roller bodies (1); both ends of the arc-shaped scraper (2) are connected to a lifting mechanism (22) via a vertical rod (21), and the lower end of the arc-shaped scraper (2) is used to scrape up the rubber material that is turned up along with the roller body (1) when the arc-shaped scraper (2) is lowered to fit the surface of the roller body (1); The upper ends of the arc-shaped limit plates (3) are connected to cross bars (31), both ends of the cross bars (31) are rotatably matched with the upper cross frame (30), and one end of the cross bars (31) is rotatably matched with a rotating motor (32), and the rotating motor (32) is fixed to the upper cross frame (30). The arc-shaped limit plates (3) protrude toward the middle direction of the pair of roller bodies (1), and the lower ends of the arc-shaped limit plates (3) are used to receive the rubber material scraped from the upper ends of the arc-shaped scrapers (2).

3. The high temperature resistant packer sealing rubber mixing method according to claim 1, characterized in that: The arc-shaped scraper (2) is located above the trajectory of the rubber material as it turns upward along the roller body (1); the arc shape of the bottom surface of the arc-shaped scraper (2) matches the circumferential surface of the roller body (1); when the arc-shaped scraper (2) descends to fit the surface of the roller body (1), the lower end of the arc-shaped scraper (2) is located at the half height of the roller body (1).

4. The high temperature resistant packer sealing rubber mixing method according to claim 1, characterized in that: The arc-shaped limiting plates (3) are in the form of a semicircular arc and include a plurality of arc-shaped limiting plates (3) which are arranged in an array along the length direction of the crossbar (31) and whose upper ends are all connected to the arc-shaped limiting plates (3).

5. The high temperature resistant packer sealing rubber mixing method according to claim 1, characterized in that: The two ends of the upper horizontal frame (30) are connected to a pair of horizontal linear mechanisms (4); the travel direction of the horizontal linear mechanisms (4) is perpendicular to the length direction of the roller body (1) and is used to drive the upper horizontal frame (30) to move.

6. The high temperature resistant packer sealing rubber mixing method according to claim 1, characterized in that: The roller bodies (1) are all rotatably arranged on a rotating seat and are all connected to a motor and a heater. The motor is used to drive the roller bodies (1) to rotate, and the heater is used to heat the roller bodies (1). The rotating seat is arranged on a side rail seat (10).

7. The high temperature resistant packer sealing rubber mixing method according to claim 6, characterized in that: The bottom of the rotating seat corresponding to one of the roller bodies (1) is slidably matched in the slide groove (11) of the side rail seat (10), the length direction of the slide groove (11) is consistent with the length direction of the side rail seat (10), and is perpendicular to the length direction of the roller body (1). The side rail seat (10) is provided with an adjustment motor (13) and a screw seat (15), which are respectively located at two ends of the slide groove (11). The output shaft of the adjustment motor (13) is connected to a screw (14), and the screw (14) is threadedly passed through the rotating seat and is rotatably matched with the screw seat (15). The lifting mechanism (22) is a lifting cylinder fixed on the side rail seat (10).

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