Preparation method of temperature-resistant and salt-resistant fracturing fluid

Abstract

The invention belongs to the technical field of fracturing fluids, and particularly relates to a preparation method of a temperature-resistant and salt-resistant fracturing fluid, which comprises the following steps: S1, mixing and stirring a cross-linking agent, a thickening agent, calcium carbonate, calcium sulfate, barium sulfate, a sulfonic acid group, an amide group, a tertiary amine group, a temperature stabilizer, a cleanup additive and water, and introducing into a measuring cup filled with the fracturing fluid; s2, the measuring cup pushes the sliding plate to slide into the containing groove of the fixed plate, so that the measuring cup is located under the rotor, and the stirrer moves downwards to drive the rotor to enter the measuring cup for stirring; s3, after the mixing is completed; a first spring in a storage groove drives a sliding plate to reset, and the fracturing fluid adhering to the surface of the rotor is collected through a collecting groove; according to the stirring machine in the preparation method, the fracturing fluid adhered to the surface of the rotor is collected through the sliding plate and the collecting tank on the stirring machine, manual cleaning is not needed, meanwhile, the fracturing fluid can be recycled after being collected through the collecting tank, and therefore the preparation efficiency of the fracturing fluid is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fracturing fluid, in particular to a method for preparing a temperature-resistant and salt-resistant fracturing fluid. Background Art

[0002] Fracturing fluid is a working fluid that transfers the high pressure generated by ground equipment to the formation, causing the formation to break and form cracks, and transports proppant along the cracks. Fracturing fluid is a heterogeneous and unstable chemical system formed by a variety of additives in a certain ratio. It is the working fluid used for fracturing and transformation of oil and gas layers.

[0003] The working principle of fracturing fluid is to utilize the principle of liquid pressure transmission, and inject fracturing fluid with a certain viscosity into the oil layer at a pressure greater than the absorption capacity of the oil layer, and gradually increase the pressure in the wellbore, thereby building up high pressure at the bottom of the well. When this pressure is greater than the ground stress near the well wall and the tensile strength of the formation rock, cracks will be generated in the formation near the bottom of the well: continue to inject sand-carrying fluid with proppant, the cracks extend forward and are filled with proppant, and after the well is shut down, the cracks close on the proppant, thereby forming sand-filled cracks with certain geometric dimensions and high conductivity in the formation near the bottom of the well, so that the well can achieve the purpose of increasing production and injection.

[0004] However, the above technology often has the following defects: when preparing the existing heat-resistant and salt-resistant fracturing fluid, it is necessary to place a measuring cup containing the mixed liquid on a stirring mechanism for uniform mixing. When the materials are uniformly stirred, a rotor used for stirring extends from the measuring cup, and a large amount of residual liquid adheres to its surface, requiring the staff to spend time and effort to clean its surface; the cleaning may not be timely, resulting in residual liquid dripping onto the workbench and causing waste. At the same time, the dripping fracturing fluid is difficult to remove, affecting the flatness of the workbench, thereby affecting the continuous operation of the subsequent measuring cup, and further affecting the preparation efficiency of the heat-resistant and salt-resistant fracturing fluid.

[0005] To this end, the present invention provides a method for preparing a temperature-resistant and salt-resistant fracturing fluid. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for preparing a temperature-resistant and salt-resistant fracturing fluid according to the present invention, the method comprising the following steps:

[0008] S1: Pour the cross-linking agent, thickener, calcium carbonate, calcium sulfate, barium sulfate, sulfonic acid group, amide group and tertiary amine group into water and mix and stir. After the stirring is completed, pour the temperature stabilizer and stir again, add water again, pour the drainage agent and mix and stir at the same time, then introduce the measuring cup filled with fracturing fluid and place the measuring cup on the mixer;

[0009] S2: The measuring cup contacts the sliding plate on the blender and pushes the sliding plate to slide into the storage groove of the fixed plate, so that the measuring cup is directly below the rotor, and the blender moves downward to drive the rotor into the measuring cup;

[0010] S3: Remove the measuring cup after stirring from the blender, and let the measuring cup stand still to observe the effect after mixing and stirring; at the same time, the first spring in the storage groove drives the sliding plate to reset, so that the collection groove on the surface of the sliding plate is directly below the rotor, and the fracturing fluid adhered to the surface of the rotor is collected.

[0011] When the existing temperature-resistant and salt-resistant fracturing fluid is prepared, the measuring cup containing the mixed liquid needs to be placed on the stirring mechanism for uniform mixing. After the materials are stirred evenly, when the rotor for stirring extends out of the measuring cup, there is a lot of residual liquid adhered to its surface, which requires the staff to spend time and effort cleaning its surface; it may also occur that the cleaning is not timely, resulting in waste of the residual liquid dripping onto the workbench, and at the same time, the dripping fracturing fluid is difficult to remove, affecting the flatness of the workbench, thus affecting the continuous work of the subsequent measuring cup, and further affecting the preparation efficiency of the temperature-resistant and salt-resistant fracturing fluid.

[0012] Through the blender in the above preparation method, the present invention can collect the fracturing fluid adhered to the surface of the rotor by using the sliding plate and the collection groove on the blender after the fracturing fluid is stirred and mixed, without manual cleaning, and at the same time effectively avoid the fracturing fluid dripping onto the workbench, enabling the measuring cup to work continuously and stably on the workbench. At the same time, after the fracturing fluid is collected by the collection groove, it can be recycled and reused, thereby improving the preparation efficiency of the fracturing fluid;

[0013] At the same time, by adding a cross-linking agent and a thickening agent, the cross-linking agent causes chemical bonds to form between linear molecules, connecting the linear molecules together to form a network structure, thereby improving the strength and elasticity of the polymer material, and the thickening agent greatly increases the consistency of the fracturing fluid; by mixing and stirring sulfonic acid groups, amide groups and tertiary amine groups to obtain an anti-salt monomer, and adding the obtained anti-salt monomer to the fracturing fluid, the anti-salt monomer and the fracturing fluid are fully mixed, and the salt tolerance of the fracturing fluid is improved by the anti-salt monomer.

[0014] Preferably, the bottom of the mixer is rotatably connected to a rotor, the surface of the mixer is fixedly mounted with a bottom plate, one side of the bottom plate is fixedly mounted with a fixing plate, an end of the fixing plate away from the bottom plate is provided with a receiving groove, the interior of the receiving groove is slidably connected with a sliding plate, an inner wall of the receiving groove is fixedly connected with a first spring, the other end of the first spring is fixedly connected to the sliding plate, the end of the sliding plate away from the first spring is semicircular, and a collecting groove is provided on the top of the sliding plate; when the present invention is working, when the measuring cup is placed on the mixer, the surface of the measuring cup will contact with the arc surface of the sliding plate, and by setting one end of the sliding plate to be arc-shaped, it is to better fit with the measuring cup, and by pushing The measuring cup moves toward the side of the fixed plate, and the measuring cup will be directly under the rotor. At this time, the mixer is started, and the mixer moves the rotor down and mixes the liquid in the measuring cup. When the mixing is completed, the measuring cup leaves the mixer, and the first spring in the receiving groove brings the sliding plate to reset, so that the collecting groove on the surface of the sliding plate is directly under the rotor. Since there will be residual fracturing fluid on the surface of the rotor, and the fracturing fluid is viscous, it will slowly drip after adhering to the surface of the rotor, and the dripping fracturing fluid will drip into the collecting groove of the sliding plate, so that the collecting groove can collect the fracturing fluid, effectively preventing the fracturing fluid from dripping onto the mixer. The fracturing fluid can be collected by the collecting groove and recycled for reuse.

[0015] Preferably, a square groove communicating with the collecting groove is formed on the top of the sliding plate, and a push plate is slidably connected to the inside of the square groove, and a sealing plate is fixedly installed on the surface of the push plate, and the side wall of the sealing plate is slidably connected to the square groove, and a scraper with a triangular cross-section is fixedly installed on the bottom of the push plate, and a second spring is fixedly installed on one side of the scraper, and the other end of the second spring is fixedly connected to the collecting groove, and the inner wall of the collecting groove is rotatably connected to the end cover through a torsion spring; during operation, when the collecting groove collects a certain amount of fracturing fluid, the push plate is pushed to allow the push plate to move with the scraper to the curved surface of the sliding plate, and the scraper scrapes off the fracturing fluid collected in the collecting groove, and one end of the scraper will contact and lift up the end cover in the collecting groove, thereby pushing out the fracturing fluid in the collecting groove, and installing the end cover can effectively prevent the fracturing fluid in the collecting groove from flowing out when the collecting groove is not cleaned, thereby improving the collection efficiency of the collecting groove.

[0016] Preferably, a baffle with an arc-shaped cross-section is fixedly installed on the top of the scraper, and the free end of the baffle is bent in the direction away from the push plate; when working, by installing the arc-shaped baffle on the top of the scraper, when the scraper cleans more and more accumulated fracturing fluid, the arc-shaped baffle plays a role in guiding the fracturing fluid, so that the fracturing fluid continuously rolls toward the end cover under the action of the arc-shaped baffle, thereby playing the role of cleaning the collection tank, and at the same time can effectively prevent the fracturing fluid from crossing the scraper, resulting in subsequent difficulties in cleaning.

[0017] Preferably, a number of elastic balls are fixedly installed inside the collecting groove. A shrinkage hole is formed on the surface of the elastic ball. A rectangular groove and a connection hole are formed inside the sliding plate. The rectangular groove is located below the collecting groove. Both ends of the connection hole communicate with the collecting groove and the rectangular groove respectively. A heating wire is fixedly installed inside the rectangular groove. A breathable cloth is fixedly installed between the rectangular groove and the collecting groove. During operation, when the viscous fracturing fluid in the collecting groove hardens, the heating wire in the rectangular groove is started at this time, so that the heat generated by the heating wire is transmitted into the collecting groove through the breathable cloth to soften the hardened fracturing fluid in the collecting groove. At the same time, the push plate is used to drive the scraping plate to slide towards the elastic ball, and the elastic ball is squeezed by the scraping plate, so that the gas in the elastic ball is blown towards the rectangular groove through the connection hole, and then the heat generated by the heating wire is quickly blown into the collecting groove to improve the circulation efficiency of the hot air.

[0018] Preferably, a through groove is formed on one side of the scraping plate. A breaking block is hermetically and slidably connected inside the through groove. An elastic member is fixedly connected to the inner wall of the through groove. The other end of the elastic member is fixedly connected to the breaking block. The other end of the through groove is hermetically and slidably connected with an inclined auxiliary block. The auxiliary block is connected to the through groove through an elastic rope. During operation, when the scraping plate is cleaning the hardened fracturing fluid in the collecting groove, the breaking block is used to perform a breaking treatment on it first, which facilitates the subsequent scraping work of the scraping plate. When the breaking block cannot break it at one time, the breaking block will be squeezed and slide into the through groove to contract, thereby squeezing the gas in the through groove. The gas in the through groove will push the auxiliary block, so that the tip of the auxiliary block suddenly inserts into the hardened fracturing fluid, further playing a role in assisting in breaking and cleaning.

[0019] Preferably, a number of connecting balls are fixedly installed at the bottom of the auxiliary block. A conical inserting rod is fixedly installed on the surface of the connecting ball. During operation, by installing the connecting ball and the inserting rod at the bottom of the auxiliary block, when the auxiliary block slides out of the through groove for breaking, the conical inserting rod can further play a role in inserting and breaking, and the pendulum ball plays a role in increasing the impact area for breaking.

[0020] Preferably, a cleaning plate made of rubber is fixedly installed at the bottom of the auxiliary block. The cross section of the cleaning plate is arc-shaped. During operation, by installing the arc-shaped cleaning plate at the bottom of the auxiliary block, when more and more fracturing fluid accumulates in front of the scraping plate, the fracturing fluid will enter between the through groove and the auxiliary block. At this time, when the auxiliary block moves, it will drive the arc-shaped cleaning plate to move together, and the arc-shaped cleaning plate is used to discharge the fracturing fluid between the auxiliary block and the through groove, thereby playing a role in self-cleaning.

[0021] Preferably, a hollow elastic membrane is fixedly installed on the surface of the mixer. The sliding plate is hermetically and slidably connected to the receiving groove. An air pipe is connected between the elastic membrane and the receiving groove. An anti-slip pad is fixedly installed on the arc surface of the sliding plate. During operation, when the measuring cup contacts the sliding plate and slides and presses it, the gas inside will be compressed when the sliding plate slides in the receiving groove, causing the gas in the receiving groove to enter the hollow elastic membrane through the air pipe, making the elastic membrane expand rapidly, thereby blocking the measuring cup and preventing the measuring cup from shifting due to the elastic force of the first spring in the receiving groove. At the same time, when the measuring cup pushes the sliding plate, it will contact the anti-slip pad, and the anti-slip pad increases friction to prevent slipping and facilitates pushing the sliding plate.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. For the preparation method of a temperature- and salt-resistant fracturing fluid of the present invention, through the mixer in the preparation method, after the fracturing fluid is stirred and mixed, the fracturing fluid adhering to the surface of the rotor can be collected by the sliding plate and the collection groove on the mixer, without manual cleaning. At the same time, it effectively avoids the fracturing fluid from dripping onto the workbench, enabling the measuring cup to work continuously and stably on the workbench. At the same time, after the fracturing fluid is collected by the collection groove, it can be recycled and reused, thereby improving the preparation efficiency of the fracturing fluid.

[0024] 2. For the preparation method of a temperature- and salt-resistant fracturing fluid of the present invention, when the collection groove collects a certain amount of fracturing fluid, push the push plate to move the scraper with the push plate towards the arc surface of the sliding plate. The scraper scrapes off the fracturing fluid collected in the collection groove. One end of the scraper will contact and lift the end cover in the collection groove, thereby pushing out the fracturing fluid in the collection groove. By installing the end cover, it can effectively avoid the situation of the fracturing fluid flowing out of the collection groove when the collection groove is not cleaned, thereby improving the collection efficiency of the collection groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 is a schematic flow chart of the method of the present invention;

[0027] Figure 2 is a three-dimensional structural schematic diagram of the mixer in the present invention;

[0028] Figure 3 is a cross-sectional structural schematic diagram of the bottom plate in the present invention;

[0029] Figure 4 is a cross-sectional structural schematic diagram of the sliding plate in the present invention;

[0030] Figure 5 is a cross-sectional structural schematic diagram of the scraper in the present invention;

[0031] Figure 6 is the schematic structural diagram of part A in the present invention Figure 5 ;

[0032] Figure 7 is the schematic structural diagram of the elastic membrane in the second embodiment of the present invention

[0033] In the figure: 1, mixer; 2, rotor; 3, bottom plate; 4, fixing plate; 5, storage groove; 6, sliding plate; 7, collection groove; 8, push plate; 9, sealing plate; 10, scraping plate; 11, end cover; 12, baffle; 13, elastic ball; 14, rectangular groove; 15, heating wire; 16, breathable cloth; 17, through groove; 18, broken block; 19, auxiliary block; 20, connecting ball; 21, inserting rod; 22, cleaning plate; 23, first spring; 24, second spring; 25, elastic member; 26, elastic membrane; 27, anti-slip pad. Detailed implementation manners

[0034] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0035] As Figure 1 shown, a preparation method of a temperature- and salt-resistant fracturing fluid includes the following steps:

[0036] S1: Pour a crosslinking agent, a thickening agent, calcium carbonate, calcium sulfate, barium sulfate, sulfonic group, amide group and tertiary amine group into water for mixing and stirring. After the stirring is completed, pour in a temperature stabilizer and stir again, add water again, and at the same time pour in a flowback aid for mixing and stirring. Then pour it into a measuring cup containing the fracturing fluid, and place the measuring cup on the mixer 1;

[0037] S2: The measuring cup contacts the sliding plate 6 on the mixer 1 and pushes the sliding plate 6 to slide into the storage groove 5 of the fixing plate 4, so that the measuring cup is directly below the rotor 2, and the mixer 1 moves down to drive the rotor 2 into the measuring cup;

[0038] S3: Remove the measuring cup from the mixer 1 after the stirring is completed, let the measuring cup stand still to observe the mixing and stirring effect. At the same time, the first spring 23 in the storage groove 5 drives the sliding plate 6 to reset, so that the collection groove 7 on the surface of the sliding plate 6 is directly below the rotor 2, and the fracturing fluid adhering to the surface of the rotor 2 is collected.

[0039] When preparing the existing temperature- and salt-resistant fracturing fluid, a measuring cup containing the mixed liquid needs to be placed on the stirring mechanism for uniform mixing. After the materials are stirred evenly, when the rotor 2 for stirring extends out of the measuring cup, there is a lot of residual liquid adhering to its surface, which requires staff to spend a lot of time and effort cleaning its surface; there will also be a situation where the cleaning is not timely, resulting in the waste of the residual liquid dripping onto the workbench. At the same time, the dripping fracturing fluid is difficult to remove, affecting the flatness of the workbench, thus affecting the continuous operation of the subsequent measuring cup, and further affecting the preparation efficiency of the temperature- and salt-resistant fracturing fluid.

[0040] Through the mixer 1 in the above preparation method, the present invention can collect the fracturing fluid adhering to the surface of the rotor 2 by using the sliding plate 6 and the collection tank 7 on the mixer 1 after the fracturing fluid is stirred and mixed, without manual cleaning. At the same time, it effectively avoids the fracturing fluid from dripping onto the workbench, enabling the measuring cup to work continuously and stably on the workbench. At the same time, the fracturing fluid can be collected and recycled through the collection tank 7, thereby improving the preparation efficiency of the fracturing fluid.

[0041] At the same time, by adding a crosslinking agent and a thickening agent, the crosslinking agent causes chemical bonds to form between linear molecules, connecting the linear molecules together to form a network structure, thus improving the strength and elasticity of the polymer material. The thickening agent greatly increases the consistency of the fracturing fluid; by mixing and stirring sulfonic acid groups, amide groups, and tertiary amine groups to obtain a salt-resistant monomer and adding the obtained salt-resistant monomer to the fracturing fluid, the salt-resistant monomer and the fracturing fluid are fully mixed, and the salt resistance of the fracturing fluid is improved through the salt-resistant monomer.

[0042] Example 1: As Figures 2 to 6As shown, a rotor 2 is rotatably connected to the bottom of a mixer 1. A bottom plate 3 is fixedly installed on the surface of the mixer 1. A fixing plate 4 is fixedly installed on one side of the bottom plate 3. A receiving groove 5 is formed at one end of the fixing plate 4 away from the bottom plate 3. A sliding plate 6 is slidably connected inside the receiving groove 5. A first spring 23 is fixedly connected to the inner wall of the receiving groove 5. The other end of the first spring 23 is fixedly connected to the sliding plate 6. One end of the sliding plate 6 away from the first spring 23 is semicircular. A collecting groove 7 is formed at the top of the sliding plate 6. When the present invention works, when a measuring cup is placed on the mixer 1, the surface of the measuring cup will contact the arc surface of the sliding plate 6. By setting one end of the sliding plate 6 to be arc-shaped, it is to better fit with the measuring cup. By pushing the measuring cup to move towards the fixing plate 4, the measuring cup will be directly below the rotor 2. At this time, start the mixer 1 to make the mixer 1 drive the rotor 2 to move downward and mix and stir the liquid in the measuring cup. After the stirring is completed, the measuring cup leaves the mixer 1. At this time, the first spring 23 in the receiving groove 5 drives the sliding plate 6 to reset, so that the collecting groove 7 on the surface of the sliding plate 6 is directly below the rotor 2. Since there will be residual fracturing fluid on the surface of the rotor 2 and the fracturing fluid is viscous, it will slowly drip after adhering to the surface of the rotor 2. The dripping fracturing fluid will drip into the collecting groove 7 of the sliding plate 6, making the collecting groove 7 play a role in collecting the fracturing fluid, effectively preventing the fracturing fluid from dripping onto the mixer 1. After the fracturing fluid is collected by the collecting groove 7, it can be recycled and reused.

[0043] A square groove communicating with the collecting groove 7 is formed at the top of the sliding plate 6. A push plate 8 is slidably connected inside the square groove. A sealing plate 9 is fixedly installed on the surface of the push plate 8. The side wall of the sealing plate 9 is slidably connected to the square groove. A scraper 10 with a triangular cross-section is fixedly installed at the bottom of the push plate 8. A second spring 24 is fixedly installed on one side of the scraper 10. The other end of the second spring 24 is fixedly connected to the collecting groove 7. An end cover 11 is rotatably connected to the inner wall of the collecting groove 7 through a torsion spring. When it works, when the collecting groove 7 collects a certain amount of fracturing fluid, push the push plate 8 to make the push plate 8 drive the scraper 10 to move towards the arc surface of the sliding plate 6. The scraper 10 scrapes off the fracturing fluid collected in the collecting groove 7. One end of the scraper 10 will contact the end cover 11 in the collecting groove 7 and push it up, so as to push out the fracturing fluid in the collecting groove 7. By installing the end cover 11, it can effectively prevent the situation that the fracturing fluid in the collecting groove 7 flows out when the collecting groove 7 is not cleaned, thereby improving the collection efficiency of the collecting groove 7.

[0044] A baffle plate 12 with an arc-shaped cross-section is fixedly installed on the top of the scraper 10, and the free end of the baffle plate 12 is bent in the direction away from the push plate 8; when working, by installing the arc-shaped baffle plate 12 on the top of the scraper 10, when the scraper 10 cleans more and more accumulated fracturing fluid, the arc-shaped baffle plate 12 plays a role in guiding the fracturing fluid, so that the fracturing fluid continuously rolls toward the end cover 11 under the action of the arc-shaped baffle plate 12, thereby playing a role in cleaning the collection tank 7, and at the same time can effectively prevent the fracturing fluid from crossing the scraper 10, resulting in subsequent difficulties in cleaning.

[0045] A plurality of elastic balls 13 are fixedly installed inside the collecting tank 7, and shrinkage holes are provided on the surface of the elastic balls 13. A rectangular groove 14 and a connecting hole are provided inside the sliding plate 6. The rectangular groove 14 is located below the collecting tank 7, and the two ends of the connecting hole are respectively connected to the collecting tank 7 and the rectangular groove 14. A heating wire 15 is fixedly installed inside the rectangular groove 14, and a breathable cloth 16 is fixedly installed between the rectangular groove 14 and the collecting tank 7. During operation, when the viscous fracturing fluid in the collecting tank 7 hardens, the heating wire 15 in the rectangular groove 14 is started at this time, so that the heat generated by the heating wire 15 is transmitted to the collecting tank 7 through the breathable cloth 16, and the hardened fracturing fluid in the collecting tank 7 is softened. At the same time, the push plate 8 is used to slide the scraper 10 in the direction of the elastic ball 13, and the scraper 10 is used to squeeze the elastic ball 13, so that the gas in the elastic ball 13 is blown to the direction of the rectangular groove 14 through the connecting hole, and then the heat generated by the heating wire 15 is quickly blown into the collecting tank 7, thereby improving the circulation efficiency of the hot gas.

[0046] A through groove 17 is provided on one side of the scraper 10, and a crushing block 18 is sealed and slidably connected inside the through groove 17. An elastic member 25 is fixedly connected to the inner wall of the through groove 17, and the other end of the elastic member 25 is fixedly connected to the crushing block 18. The other end of the through groove 17 is sealed and slidably connected to an inclined auxiliary block 19, and the auxiliary block 19 is connected to the through groove 17 through an elastic rope. When working, when the scraper 10 is cleaning the hardened fracturing fluid in the collecting tank 7, the crushing block 18 is used to crush it first, thereby facilitating the subsequent scraping work of the scraper 10. When the crushing block 18 cannot be crushed at one time, the crushing block 18 will be squeezed and then slide and shrink into the through groove 17, thereby squeezing the gas in the through groove 17. The gas in the through groove 17 will push the auxiliary block 19, so that the tip of the auxiliary block 19 suddenly inserts into the hardened fracturing fluid, further playing a role in assisting crushing and cleaning.

[0047] A plurality of connecting balls 20 are fixedly installed at the bottom of the auxiliary block 19, and a conical plug rod 21 is fixedly installed on the surface of the connecting ball 20; during operation, by installing the connecting balls 20 and the plug rod 21 at the bottom of the auxiliary block 19, when the auxiliary block 19 slides out of the through slot 17 for crushing, the conical plug rod 21 can further play the role of insertion and crushing, and the swing ball plays the role of increasing the impact area for crushing.

[0048] A cleaning plate 22 made of rubber is fixedly installed at the bottom of the auxiliary block 19, and the cross-section of the cleaning plate 22 is arc-shaped; during operation, by installing the arc-shaped cleaning plate 22 at the bottom of the auxiliary block 19, when more and more fracturing fluid accumulates in front of the scraper 10, the fracturing fluid will enter between the through groove 17 and the auxiliary block 19. At this time, when the auxiliary block 19 moves, it will drive the arc-shaped cleaning plate 22 to move together, and use the arc-shaped cleaning plate 22 to discharge the fracturing fluid between the auxiliary block 19 and the through groove 17, thereby playing a role of self-cleaning.

[0049] Example 2: As Figure 7 shown, compared with Example 1, another implementation manner of the present invention is: a hollow elastic membrane 26 is fixedly installed on the surface of the mixer 1, the sliding plate 6 is hermetically and slidably connected to the receiving groove 5, an air pipe is connected between the elastic membrane 26 and the receiving groove 5, and an anti-slip pad 27 is fixedly installed on the arc surface of the sliding plate 6; during operation, when the measuring cup contacts the sliding plate 6 and slides and presses it, the sliding plate 6 slides in the receiving groove 5 and squeezes the internal gas, so that the gas in the receiving groove 5 enters the hollow elastic membrane 26 through the air pipe, causing the elastic membrane 26 to expand rapidly, thereby blocking the measuring cup and preventing the measuring cup from being displaced due to the elastic force of the first spring 23 in the receiving groove 5. At the same time, when the measuring cup pushes the sliding plate 6, it will contact the anti-slip pad 27, and the anti-slip pad 27 plays a role of increasing friction to prevent slipping and facilitating the pushing of the sliding plate 6.

[0050] Working principle: When the measuring cup is placed on the mixer 1, the surface of the measuring cup will contact the arc surface of the sliding plate 6. By setting one end of the sliding plate 6 to be arc-shaped, it is to better fit the measuring cup. By pushing the measuring cup to move towards the fixing plate 4, the measuring cup will be directly below the rotor 2. At this time, start the mixer 1, let the mixer 1 drive the rotor 2 to move downward and mix and stir the liquid in the measuring cup. After the stirring is completed, the measuring cup leaves the mixer 1. At this time, the first spring 23 in the receiving groove 5 drives the sliding plate 6 to reset, so that the collecting groove 7 on the surface of the sliding plate 6 is directly below the rotor 2. Since there will be residual fracturing fluid on the surface of the rotor 2 and the fracturing fluid is viscous, it will slowly drip after adhering to the surface of the rotor 2, and the dripping fracturing fluid will drip into the collecting groove 7 of the sliding plate 6, making the collecting groove 7 play a role of collecting the fracturing fluid, effectively preventing the fracturing fluid from dripping onto the mixer 1. After the fracturing fluid is collected by the collecting groove 7, it can be recycled and reused.

[0051] When the collection tank 7 collects a certain amount of fracturing fluid, the push plate 8 is pushed, and the push plate 8 moves with the scraper 10 to the curved surface of the sliding plate 6. The scraper 10 scrapes off the fracturing fluid collected in the collection tank 7. One end of the scraper 10 contacts the end cover 11 in the collection tank 7 and lifts it up, thereby pushing out the fracturing fluid in the collection tank 7. By installing the end cover 11, the outflow of the fracturing fluid in the collection tank 7 can be effectively avoided when the collection tank 7 is not cleaned, thereby improving the collection efficiency of the collection tank 7. By installing the arc-shaped baffle 12 on the top of the scraper 10, when the scraper 10 cleans more and more accumulated fracturing fluid, the arc-shaped baffle 12 plays a role in guiding the fracturing fluid, so that the fracturing fluid continuously rolls toward the end cover 11 under the action of the arc-shaped baffle 12, thereby playing a role in cleaning the collection tank 7, and at the same time, it can effectively prevent the fracturing fluid from passing over the scraper 10, resulting in subsequent difficult cleaning.

[0052] When the viscous fracturing fluid in the collecting tank 7 hardens, the heating wire 15 in the rectangular groove 14 is started, so that the heat generated by the heating wire 15 is transmitted to the collecting tank 7 through the breathable cloth 16, and the hardened fracturing fluid in the collecting tank 7 is softened. At the same time, the push plate 8 is used to slide the scraper 10 in the direction of the elastic ball 13, and the scraper 10 is used to squeeze the elastic ball 13, so that the gas in the elastic ball 13 is blown to the direction of the rectangular groove 14 through the connecting hole, and then the heat generated by the heating wire 15 is quickly blown into the collecting tank 7, thereby improving the circulation efficiency of the hot gas. When the scraper 10 is cleaning the hardened fracturing fluid in the collecting tank 7, the crushing block 18 is used to crush it first, thereby facilitating the subsequent scraping work of the scraper 10. When the crushing block 18 cannot be crushed at one time, the crushing block 18 will be squeezed and then slide and shrink into the through groove 17, thereby squeezing the gas in the through groove 17. The gas in the through groove 17 will push the auxiliary block 19, so that the tip of the auxiliary block 19 suddenly inserts into the hardened fracturing fluid, further playing the role of auxiliary crushing and cleaning. By installing the connecting ball 20 and the insert rod 21 at the bottom of the auxiliary block 19, when the auxiliary block 19 slides out of the through slot 17 for crushing, the conical insert rod 21 can further play the role of insertion and crushing, and the swing ball plays the role of increasing the impact area for crushing.

[0053] By installing an arc-shaped cleaning plate 22 at the bottom of the auxiliary block 19, when more and more fracturing fluid accumulates in front of the scraper 10, the fracturing fluid will enter between the through groove 17 and the auxiliary block 19. At this time, the auxiliary block 19 will move with the arc-shaped cleaning plate 22 when moving, and the arc-shaped cleaning plate 22 will be used to discharge the fracturing fluid between the auxiliary block 19 and the through groove 17, thereby achieving a self-cleaning effect.

[0054] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1Based on [a certain reference], with the perspective of observing the person as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a temperature- and salt-resistant fracturing fluid, characterized in that, the method comprises the following steps: S1: Pour a crosslinking agent, a thickening agent, calcium carbonate, calcium sulfate, barium sulfate, a sulfonic group, an amide group and a tertiary amine group into water for mixing and stirring. After the stirring is completed, pour in a temperature stabilizer and stir again, add water again, and at the same time pour in a flowback aid for mixing and stirring. Then pour it into a measuring cup containing the fracturing fluid, and place the measuring cup on a stirrer (1); S2: The measuring cup contacts the sliding plate (6) on the stirrer (1) and pushes the sliding plate (6) to slide into the receiving groove (5) of the fixing plate (4), so that the measuring cup is directly below the rotor (2), and the stirrer (1) moves downward to drive the rotor (2) into the measuring cup; S3: Remove the measuring cup after stirring from the stirrer (1), and let the measuring cup stand still to observe the effect after mixing and stirring; at the same time, the first spring (23) in the receiving groove (5) drives the sliding plate (6) to reset, so that the collecting groove (7) on the surface of the sliding plate (6) is directly below the rotor (2), and collects the fracturing fluid adhered to the surface of the rotor (2).

2. The preparation method of a temperature- and salt-resistant fracturing fluid according to claim 1, characterized in that, a rotor (2) is rotatably connected to the bottom of the stirrer (1), a bottom plate (3) is fixedly installed on the surface of the stirrer (1), a fixing plate (4) is fixedly installed on one side of the bottom plate (3), a receiving groove (5) is opened at one end of the fixing plate (4) away from the bottom plate (3), a sliding plate (6) is slidably connected inside the receiving groove (5), a first spring (23) is fixedly connected to the inner wall of the receiving groove (5), the other end of the first spring (23) is fixedly connected to the sliding plate (6), one end of the sliding plate (6) away from the first spring (23) is semicircular, and a collecting groove (7) is opened at the top of the sliding plate (6).

3. The preparation method of a temperature- and salt-resistant fracturing fluid according to claim 2, characterized in that, a square groove communicating with the collecting groove (7) is opened at the top of the sliding plate (6), a push plate (8) is slidably connected inside the square groove, a sealing plate (9) is fixedly installed on the surface of the push plate (8), the side wall of the sealing plate (9) is slidably connected to the square groove, a scraper (10) with a triangular cross section is fixedly installed at the bottom of the push plate (8), a second spring (24) is fixedly installed on one side of the scraper (10), the other end of the second spring (24) is fixedly connected to the collecting groove (7), and an end cover (11) is rotatably connected to the inner wall of the collecting groove (7) through a torsion spring.

4. The preparation method of a temperature- and salt-resistant fracturing fluid according to claim 3, characterized in that, a baffle (12) with an arc-shaped cross section is fixedly installed at the top of the scraper (10), and the free end of the baffle (12) bends away from the push plate (8).

5. The preparation method of a temperature- and salt-resistant fracturing fluid according to claim 4, characterized in that, Inside the collection tank (7), several elastic balls (13) are fixedly installed. Shrink holes are formed on the surface of the elastic balls (13). Inside the sliding plate (6), a rectangular groove (14) and a connection hole are formed. The rectangular groove (14) is located below the collection tank (7). Both ends of the connection hole communicate with the collection tank (7) and the rectangular groove (14) respectively. Inside the rectangular groove (14), a heating wire (15) is fixedly installed. A breathable cloth (16) is fixedly installed between the rectangular groove (14) and the collection tank (7).

6. The preparation method of a temperature-resistant and salt-resistant fracturing fluid according to claim 5, characterized in that, On one side of the scraping plate (10), a through groove (17) is formed. Inside the through groove (17), a crushing block (18) is hermetically and slidably connected. The inner wall of the through groove (17) is fixedly connected with an elastic member (25). The other end of the elastic member (25) is fixedly connected with the crushing block (18). The other end of the through groove (17) is hermetically and slidably connected with an inclined auxiliary block (19). The auxiliary block (19) is connected to the through groove (17) through an elastic rope.

7. The preparation method of a temperature-resistant and salt-resistant fracturing fluid according to claim 6, characterized in that, Several connecting balls (20) are fixedly installed at the bottom of the auxiliary block (19). Conical insertion rods (21) are fixedly installed on the surface of the connecting balls (20).

8. The preparation method of a temperature-resistant and salt-resistant fracturing fluid according to claim 7, characterized in that, A cleaning plate (22) made of rubber is fixedly installed at the bottom of the auxiliary block (19). The cross section of the cleaning plate (22) is arc-shaped.

9. The preparation method of a temperature-resistant and salt-resistant fracturing fluid according to claim 8, characterized in that, A hollow elastic membrane (26) is fixedly installed on the surface of the mixer (1). The sliding plate (6) is hermetically and slidably connected with the storage tank (5). An air pipe is connected between the elastic membrane (26) and the storage tank (5). An anti-slip pad (27) is fixedly installed on the arc surface of the sliding plate (6).

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