Preparation method and application of low-temperature guar gum fracturing fluid for oil and gas well fracturing

Abstract

The invention belongs to the technical field of fracturing fluids, and particularly relates to a preparation method and application of a low-temperature guar gum fracturing fluid for oil and gas well fracturing, and the preparation method comprises the following steps: S1, weighing raw materials according to the weight parts of the raw materials; s2, all the raw materials are guided into a stirring machine according to the proportion to be mixed, stirred and processed, the processed low-temperature guar gum fracturing fluid is put into a viscometer to be detected, after the low-temperature guar gum fracturing fluid is detected to be qualified, the viscometer drives a rotor to ascend, and a scraping plate arranged on the viscometer is used for scraping and cleaning the low-temperature guar gum fracturing fluid attached to the surface of the rotor; s3, putting the qualified low-temperature guar gum fracturing fluid into a centrifugal machine for centrifugal treatment; according to the viscometer in the method, residual fracturing fluid on the surface of the rotor can be automatically scraped and cleaned by using the scraper blade after the rotor is used, manual cleaning is not needed, meanwhile, the situation that the surface of the rotor is polluted due to manual cleaning is reduced, and the accuracy of preparing the low-temperature guar gum fracturing fluid for oil and gas well fracturing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing fluids, and in particular to a preparation method and application of a low-temperature guar gum fracturing fluid for oil and gas wells. Background Art

[0002] A fracturing fluid refers to a heterogeneous and unstable chemical system formed by mixing various additives in a certain ratio, and it is a working fluid used for fracturing and reforming oil and gas reservoirs. Its main function is to transmit the high pressure generated by surface equipment into the formation, causing the formation to fracture and form cracks, and transporting proppants along the cracks.

[0003] However, the existing preparation technologies of low-temperature guar gum fracturing fluids for oil and gas wells often have the following defects: during the preparation of low-temperature guar gum fracturing fluids, the processed fracturing fluid needs to be put into a viscometer for detection. When the viscometer is in use, the rotor enters the low-temperature guar gum fracturing fluid for detection. After the detection is qualified, the rotor extends out of the low-temperature guar gum fracturing fluid. Since the surface of the rotor adheres to residual low-temperature guar gum fracturing fluid, it often requires manual cleaning of its surface, which is time-consuming and laborious. At the same time, manual cleaning also has problems such as incomplete cleaning or contamination of the rotor, thus affecting the accuracy of subsequent fracturing fluid detection.

[0004] Therefore, the present invention provides a preparation method and application of a low-temperature guar gum fracturing fluid for oil and gas wells. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A preparation method of a low-temperature guar gum fracturing fluid for oil and gas wells according to the present invention, the method comprising the following steps:

[0007] S1: Weigh a bactericide, an anti-swelling agent, a flowback aid, a foaming agent, a gel breaker promoter, a crosslinking agent, a gel breaker, a mannanase, and water respectively according to the weight parts of each raw material;

[0008] S2: Import each raw material into a blender according to the ratio for mixing and stirring processing, and put the obtained low-temperature guar gum fracturing fluid into a viscometer for detection, so that the chassis enters the low-temperature guar gum fracturing fluid, and at the same time, the grooves on the surface of the rotor are flush with the surface of the low-temperature guar gum fracturing fluid. After the inspection is qualified, during the process of the viscometer starting to lift the rotor, use the scraper provided on the viscometer to scrape and clean the low-temperature guar gum fracturing fluid adhering to the surface of the rotor;

[0009] S3: Put the low-temperature guar gum fracturing fluid qualified by inspection into a centrifuge for centrifugation treatment, extract a part of the centrifuged low-temperature guar gum fracturing fluid and put it into a test tube, and observe the compatibility of the centrifuged low-temperature guar gum fracturing fluid after standing.

[0010] In the process of preparing the low-temperature guar gum fracturing fluid, the processed fracturing fluid needs to be put into a viscometer for detection. When the viscometer is in use, the rotor enters the low-temperature guar gum fracturing fluid for detection. After the detection is qualified, the rotor extends out of the low-temperature guar gum fracturing fluid. Since the surface of the rotor adheres to the residual low-temperature guar gum fracturing fluid, it is often necessary to manually clean its surface, which is time-consuming and laborious. At the same time, manual cleaning also has problems such as incomplete cleaning or contamination of the rotor, thus affecting the accuracy of subsequent fracturing fluid detection. Through the viscometer in the above method, the present invention can automatically scrape and clean the residual fracturing fluid on the surface of the rotor by using a scraper after the rotor is used, without manual cleaning, and at the same time, it also reduces the situation that the surface of the rotor is contaminated by manual cleaning, improving the accuracy in the preparation of the low-temperature guar gum fracturing fluid for oil and gas well fracturing.

[0011] Preferably, a display screen is provided on the surface of the viscometer. A rotor is clamped on one side of the viscometer. Grooves are provided on the surface of the rotor. A chassis is fixedly installed at the bottom of the rotor. Two fixing plates are symmetrically and fixedly installed on the bottom surface of the viscometer. A rectangular frame is fixedly installed on the side of the two fixing plates close to each other. A sliding block is slidably connected inside the rectangular frame through an elastic member. One end of the sliding block away from the rectangular frame is rotatably connected with a rubber scraper through a torsion spring. A support rod is provided at the bottom of the scraper. During operation, when the rotor finishes detecting the viscosity of the low-temperature guar gum fracturing fluid, the viscometer starts to lift the rotor. At this time, the surface of the rotor contacts the surface of the scraper, and the end of the scraper is used to scrape and clean the low-temperature guar gum fracturing fluid adhering to the surface of the rotor. The rubber scraper plays a role in protecting the surface of the rotor and can effectively prevent the end of the scraper from scratching the surface of the rotor. Since grooves are provided on the surface of the rotor, by setting the rectangular frame and the sliding block slidably connected through the elastic member, the scraper can be adaptively adjusted to fit according to the different diameters of the rotor, which can play a role in fitting the grooves, effectively adapt to the surface of the rotor, and then play a role in comprehensively cleaning the rotor, without manual cleaning, and at the same time, it also reduces the situation that the surface of the rotor is contaminated by manual cleaning. At the same time, installing the support rod can play a role in buffering and protecting the scraper. When the scraper reaches the bottom during cleaning, the support rod will contact the bottom first, thus increasing the resistance and protecting the scraper.

[0012] Preferably, the cross-section of the scraping plate is arc-shaped, the free end of the scraping plate is bent downward, and a first cleaning cotton is provided at the top of the scraping plate away from the sliding block; during operation, by designing the scraping plate to be arc-shaped and bent downward, when more and more low-temperature guar gum fracturing fluid is scraped off by the scraping plate, the arc-shaped scraping plate can play a role in guiding the low-temperature guar gum fracturing fluid downward, so that the low-temperature guar gum fracturing fluid falls back into the implement at the bottom for recovery. At the same time, the subsequent first cleaning cotton can play a role in secondary cleaning, thus achieving a better cleaning effect.

[0013] Preferably, a storage groove is formed at the top of the scraping plate, a plurality of springs are fixedly installed inside the storage groove, the other ends of the springs are fixedly installed with sliding rods, the sliding rods are slidably connected to the storage groove, and a rotating ball is rotatably connected to the end of the sliding rod away from the spring; during operation, when the scraping plate drives the first cleaning cotton to move to the groove of the rotor, the springs in the storage groove restore their elastic force at this time, and the springs drive the sliding rods to slide away from the scraping plate, so that one end of the scraping plate drives the first cleaning cotton to enter the groove of the rotor, making the surface of the first cleaning cotton contact the groove, thus achieving a better cleaning effect and enabling cleaning of the concave part. When the end of the scraping plate needs to leave the groove, the rotating ball at one end of the sliding rod can play a role in rotational guidance, enabling the sliding rod to slide and contract into the storage groove, thus facilitating leaving the groove and avoiding getting stuck.

[0014] Preferably, the cross-section of the support rod is semi-circular, a plurality of rollers are rotatably connected to the bottom of the support rod, a through groove is formed at the top of the scraping plate, a slider is hermetically slidably connected inside the through groove, the bottom of the slider is fixedly connected to the support rod, and an air outlet pipe is fixedly installed at the top of the through groove; during operation, when the support rod contacts the chassis at the bottom of the rotor, the semi-circular support rod and the rollers will contact the chassis, and the rollers play a role in auxiliary rotational guidance, causing the support rod to drive the scraping plate to rotate towards the sliding block, so that the end of the scraping plate away from the sliding block contacts the surface of the chassis, thereby scraping and cleaning the chassis. Moreover, when the support rod contacts the chassis, it will be squeezed and then slide into the through groove through the slider, thereby squeezing the gas in the through groove, causing the gas in the through groove to be ejected through the air outlet pipe, thus achieving the effect of blowing and cleaning the surface of the rotor.

[0015] Preferably, the scraper is provided with a placement groove running through the scraper, the placement groove is slidably connected to a support plate, the top of the support plate is provided with a second cleaning cotton, the support rod is slidably connected to a push plate through an elastic member, and the bottom end of the push plate protrudes from the support rod; when working, when the support rod is in contact with the chassis, the bottom of the push plate will be brought into contact with the chassis, at this time, the push plate will be squeezed and pushed by the chassis, and then slide into the placement groove, so that the top of the push plate is in contact with the bottom surface of the support plate and then pushed, so that the support plate slides out of the placement groove with the second cleaning cotton, so that the surface of the second cleaning cotton is in contact with the surface of the chassis, thereby cleaning the chassis.

[0016] Preferably, the inner wall of the placement groove is inclined, the top of the placement groove is narrower than the bottom, and an "L"-shaped limit block is fixedly installed on the bottom of the inner wall of the placement groove; during operation, by setting the placement groove to be inclined, when the support plate slides, the support plate will be stuck in the placement groove because it is made of rubber, thereby fixing the second cleaning cotton, so that when the second cleaning cotton contacts the surface of the chassis, it will not slide and shrink into the placement groove due to squeezing, thereby achieving a more efficient cleaning effect.

[0017] Preferably, a slot is provided at the bottom of the support plate, a rubber block is fixedly installed on the top of the push plate, and an elastic cloth is fixedly installed on the inner wall of the slot; when working, when the push plate is moving, it will carry the top block into the slot of the support plate, so that the push plate can better push the support plate to slide, and when the block is inserted into the slot, it will contact the elastic plate, and the elastic cloth will be squeezed and deformed between the slot and the block, thereby increasing friction. At the same time, when the block leaves the slot, the elastic cloth prevents dust from entering the slot.

[0018] Preferably, the bottoms of the first cleaning cotton and the second cleaning cotton are both installed with Velcro mother surfaces, the tops of the scraper and the support plate are both provided with rectangular grooves, and the interiors of the rectangular grooves are both fixedly installed with Velcro sub-surfaces; when working, by installing the Velcro sub-surface and the Velcro mother surface, the first cleaning cotton and the second cleaning cotton are facilitated to install and disassemble, and when the first cleaning cotton and the second cleaning cotton become dirty after long-term use, they can be quickly replaced.

[0019] The invention discloses an application of a low-temperature guar gum fracturing fluid for oil and gas well fracturing. The application adopts the above-mentioned low-temperature guar gum fracturing fluid for oil and gas well fracturing. The low-temperature guar gum fracturing fluid is used for fracturing and reforming oil and gas layers. Since the low-temperature guar gum fracturing fluid of the invention has the characteristics of high viscosity and high viscosity, when carrying sand in the well, the sand can be efficiently brought out without being damaged.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. A preparation method and application of a low-temperature guar gum fracturing fluid for oil and gas wells. The viscometer in this method can automatically scrape and clean the residual fracturing fluid on the surface of the rotor after the rotor is used, eliminating the need for manual cleaning. At the same time, it also reduces the contamination of the rotor surface caused by manual cleaning, improving the accuracy in the preparation of the low-temperature guar gum fracturing fluid for oil and gas wells.

[0022] 2. A preparation method and application of a low-temperature guar gum fracturing fluid for oil and gas wells. By designing the scraper to be arc-shaped and curved downward, when more and more low-temperature guar gum fracturing fluid is scraped off by the scraper, the arc-shaped scraper can play a role in guiding the low-temperature guar gum fracturing fluid downward, so that the low-temperature guar gum fracturing fluid falls back into the implement at the bottom for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a schematic flow chart of the preparation method in the present invention;

[0025] Figure 2 is a three-dimensional structural schematic diagram of the viscometer in the present invention;

[0026] Figure 3 is a structural schematic diagram at the rotor in the present invention;

[0027] Figure 4 is a cross-sectional structural schematic diagram of the scraper in the present invention;

[0028] Figure 5 is in the present invention Figure 3 structural schematic diagram of part A;

[0029] Figure 6 is in the present invention Figure 4 structural schematic diagram of part B;

[0030] Figure 7 is a structural schematic diagram at the second cleaning cotton in the second embodiment of the present invention.

[0031] Icons: 1 - viscometer; 2 - display screen; 3 - rotor; 4 - groove; 5 - chassis; 6 - fixing plate; 7 - rectangular frame; 8 - slider; 9 - scraper; 10 - support rod; 11 - first cleaning cotton; 12 - storage groove; 13 - slide bar; 14 - spring; 15 - rotating ball; 16 - roller; 17 - chute; 18 - slider; 19 - air outlet pipe; 20 - push plate; 21 - placement groove; 22 - second cleaning cotton; 23 - limit block; 24 - card slot; 25 - clamping block; 26 - elastic cloth; 27 - rectangular groove; 28 - hook side of magic tape; 29 - loop side of magic tape; 30 - support plate. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein generally can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0035] As Figure 1 shown, a preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing, the method comprising the following steps:

[0036] S1: Weigh guar gum, bactericide, swelling inhibitor, flowback aid, foaming agent, gel breaker promoter, gel breaker promoter, crosslinking agent, gel breaker, mannanase and water respectively according to the weight parts of each raw material;

[0037] S2: Import each raw material into a mixer according to the proportion for mixing and stirring, and put the obtained low-temperature guar gum fracturing fluid into the viscometer 1 for detection, so that the chassis 5 enters into the low-temperature guar gum fracturing fluid, and at the same time, the groove 4 on the surface of the rotor 3 is flush with the surface of the low-temperature guar gum fracturing fluid. After passing the inspection, during the process of the viscometer 1 driving the rotor 3 to rise, use the scraper 9 provided on the viscometer 1 to scrape and clean the low-temperature guar gum fracturing fluid adhered to the surface of the rotor 3;

[0038] S3: Put the qualified low-temperature guar gum fracturing fluid into a centrifuge for centrifugation. Extract a part of the centrifuged low-temperature guar gum fracturing fluid and put it into a test tube. Let it stand and observe the compatibility of the centrifuged low-temperature guar gum fracturing fluid.

[0039] During the preparation of the low-temperature guar gum fracturing fluid, the processed fracturing fluid needs to be put into the viscometer 1 for detection. When the viscometer 1 is in use, the rotor 3 enters the low-temperature guar gum fracturing fluid for detection. After the detection is qualified, the rotor 3 extends out of the low-temperature guar gum fracturing fluid. Since the surface of the rotor 3 adheres to the residual low-temperature guar gum fracturing fluid, it is often necessary to manually clean its surface, which is time-consuming and laborious. At the same time, manual cleaning also has problems such as incomplete cleaning or contamination of the rotor 3, thus affecting the accuracy of subsequent fracturing fluid detection. Through the viscometer 1 in the above method, the present invention can automatically scrape and clean the residual fracturing fluid on the surface of the rotor 3 by using the scraper 9 after the rotor 3 is used, without manual cleaning, and at the same time, it also reduces the situation that the surface of the rotor 3 is contaminated by manual cleaning, improving the accuracy during the preparation of the low-temperature guar gum fracturing fluid for oil and gas well fracturing.

[0040] Example 1:

[0041] As Figures 2 to 6As shown in the figure, the detection device of the embodiment of the present invention includes a viscometer 1. A display screen 2 is provided on the surface of the viscometer 1. A rotor 3 is clamped on one side of the viscometer 1. A groove 4 is provided on the surface of the rotor 3. A chassis 5 is fixedly installed at the bottom of the rotor 3. Two fixing plates 6 are symmetrically and fixedly installed on the bottom surface of the viscometer 1. A rectangular frame 7 is fixedly installed on the side of the two fixing plates 6 close to each other. A sliding block 8 is slidably connected inside the rectangular frame 7 through an elastic member. One end of the sliding block 8 away from the rectangular frame 7 is rotatably connected with a rubber squeegee 9 through a torsion spring. A support rod 10 is provided at the bottom of the squeegee 9. During operation, when the rotor 3 completes the viscosity detection of the low-temperature guar gum fracturing fluid, the viscometer 1 starts to lift the rotor 3. At this time, the surface of the rotor 3 contacts the surface of the squeegee 9. The end of the squeegee 9 is used to scrape and clean the low-temperature guar gum fracturing fluid adhered to the surface of the rotor 3. The rubber squeegee 9 plays a role in protecting the surface of the rotor 3 and can effectively prevent the end of the squeegee 9 from scratching the surface of the rotor 3. Since the groove 4 is provided on the surface of the rotor 3, by setting the rectangular frame 7 and the sliding block 8 slidably connected through the elastic member, the squeegee 9 can be adaptively fitted and adjusted according to the different diameters of the rotor 3, which can play a role in adapting to the groove 4, effectively adapting to the surface of the rotor 3, and further playing a role in comprehensively cleaning the rotor 3. There is no need for manual cleaning, and at the same time, the situation where the surface of the rotor 3 is contaminated due to manual cleaning is reduced, improving the accuracy during the preparation of the low-temperature guar gum fracturing fluid for oil and gas well fracturing. At the same time, the installation of the support rod 10 can play a role in buffering and protecting the squeegee 9. When the squeegee 9 reaches the bottom during cleaning, the support rod 10 will contact the bottom first, thereby increasing the resistance and protecting the squeegee 9.

[0042] The cross-section of the squeegee 9 is arc-shaped, the free end of the squeegee 9 bends downward, and a first cleaning cotton 11 is provided at the top of the squeegee 9 away from the sliding block 8. During operation, by designing the squeegee 9 to be arc-shaped and bent downward, when more and more low-temperature guar gum fracturing fluid is scraped off by the squeegee 9, the arc-shaped squeegee 9 can play a role in guiding the low-temperature guar gum fracturing fluid downward, so that the low-temperature guar gum fracturing fluid falls back into the bottom utensil for recycling. At the same time, the subsequent first cleaning cotton 11 can play a role in secondary cleaning, thus achieving a better cleaning effect.

[0043] The top of the scraping plate 9 is provided with a storage groove 12. Inside the storage groove 12, a number of springs 14 are fixedly installed. The other end of the spring 14 is fixedly installed with a sliding rod 13. The sliding rod 13 is slidably connected to the storage groove 12. The end of the sliding rod 13 away from the spring 14 is rotatably connected to a rotating ball 15. During operation, when the scraping plate 9 drives the first cleaning cotton 11 to move to the groove 4 of the rotor 3, at this time, the spring 14 in the storage groove 12 restores its elasticity. The spring 14 drives the sliding rod 13 to slide away from the scraping plate 9, so that one end of the scraping plate 9 drives the first cleaning cotton 11 to enter the groove 4 of the rotor 3, making the surface of the first cleaning cotton 11 contact with the groove 4, thus achieving a better cleaning effect and enabling the cleaning of the concave part. When the end of the scraping plate 9 needs to leave the groove 4, the rotating ball 15 at one end of the sliding rod 13 can play a role in rotational guidance, enabling the sliding rod 13 to slide and contract into the storage groove 12, thus facilitating the departure from the groove 4 and avoiding jamming.

[0044] The cross-section of the support rod 10 is semicircular. At the bottom of the support rod 10, a number of rollers 16 are rotatably connected. The top of the scraping plate 9 is provided with a through groove 17. Inside the through groove 17, a slider 18 is hermetically slidably connected. The bottom of the slider 18 is fixedly connected to the support rod 10. At the top of the through groove 17, an air outlet pipe 19 is fixedly installed. During operation, when the support rod 10 contacts the chassis 5 at the bottom of the rotor 3, the semicircular support rod 10 and the rollers 16 will contact the chassis 5. The rollers 16 play a role in assisting rotational guidance, causing the support rod 10 to drive the scraping plate 9 to rotate towards the sliding block 8, so that the end of the scraping plate 9 away from the sliding block 8 contacts the surface of the chassis 5, and then the chassis 5 is scraped and cleaned. Moreover, when the support rod 10 contacts the chassis 5, it will be squeezed and then slide into the through groove 17 through the slider 18, thus squeezing the gas in the through groove 17, causing the gas in the through groove 17 to be ejected through the air outlet pipe 19, thereby achieving the effect of blowing and cleaning the surface of the rotor 3.

[0045] The top of the scraping plate 9 is provided with a through placement groove 21. Inside the placement groove 21, a support plate 30 is slidably connected. On the top of the support plate 30, a second cleaning cotton 22 is provided. Inside the support rod 10, a push plate 20 is slidably connected through an elastic member. The bottom end of the push plate 20 protrudes from the support rod 10. During operation, when the support rod 10 contacts the chassis 5, it will drive the bottom of the push plate 20 to contact the chassis 5. At this time, the push plate 20 will be pushed by the chassis 5 and slide into the placement groove 21, so that the top of the push plate 20 contacts and pushes the bottom surface of the support plate 30, causing the support plate 30 to drive the second cleaning cotton 22 to slide out of the placement groove 21, making the surface of the second cleaning cotton 22 contact the surface of the chassis 5, thus playing a role in cleaning the chassis 5.

[0046] The inner wall of the placement groove 21 is inclined, the top of the placement groove 21 is narrower than the bottom, and an "L"-shaped limiting block 23 is fixedly installed at the bottom of the inner wall of the placement groove 21; during operation, by setting the placement groove 21 to be inclined, when the support plate 30 slides, since the support plate 30 is made of rubber, it will be stuck in the placement groove 21, thereby fixing the second cleaning cotton 22, so that when the second cleaning cotton 22 contacts the surface of the chassis 5, it will not slide and contract into the placement groove 21 due to extrusion, and thus can achieve a more efficient cleaning effect.

[0047] A clamping groove 24 is formed at the bottom of the support plate 30, a rubber material clamping block 25 is fixedly installed at the top of the push plate 20, and an elastic cloth 26 is fixedly installed on the inner wall of the clamping groove 24; during operation, when the push plate 20 moves, the clamping block 25 at the top will be inserted into the clamping groove 24 of the support plate 30, so that the push plate 20 can better push the support plate 30 to slide. When the clamping block 25 is inserted into the clamping groove 24, it will contact the elastic plate, and the elastic cloth 26 is squeezed and deformed between the clamping groove 24 and the clamping block 25, thereby playing a role in increasing friction. At the same time, when the clamping block 25 leaves the clamping groove 24, the elastic cloth 26 plays a role in preventing dust from entering the clamping groove 24.

[0048] Embodiment 2: As Figure 7 shown, compared with Embodiment 1, another implementation manner of the present invention is: magic tape female surfaces 29 are installed at the bottoms of the first cleaning cotton 11 and the second cleaning cotton 22, rectangular grooves 27 are formed at the tops of the scraping plate 9 and the support plate 30, and magic tape male surfaces 28 are fixedly installed inside the rectangular grooves 27; during operation, by installing the magic tape male surface 28 and the magic tape female surface 29, it is convenient to install and disassemble the first cleaning cotton 11 and the second cleaning cotton 22. When the first cleaning cotton 11 and the second cleaning cotton 22 become dirty after long-term use, they can be quickly replaced.

[0049] An application of a low-temperature guar gum fracturing fluid for oil and gas wells. This application uses the above-mentioned low-temperature guar gum fracturing fluid for oil and gas wells, and the low-temperature guar gum fracturing fluid is used for fracturing and reforming oil and gas layers; due to the high viscosity and high viscosity characteristics of the low-temperature guar gum fracturing fluid of the present invention, when carrying sand underground, it can efficiently carry out the sand while not being damaged.

[0050] Working principle: After the rotor 3 completes the viscosity detection of the low-temperature guar gum fracturing fluid, the viscometer 1 starts to lift the rotor 3. At this time, the surface of the rotor 3 contacts the surface of the scraper 9. The end of the scraper 9 is used to scrape and clean the low-temperature guar gum fracturing fluid adhered to the surface of the rotor 3. The scraper 9 made of rubber plays a role in protecting the surface of the rotor 3 and can effectively prevent the end of the scraper 9 from scratching the surface of the rotor 3. Since the surface of the rotor 3 is provided with grooves 4, by setting a rectangular frame 7 and a sliding block 8 slidably connected by an elastic member, the scraper 9 can be adaptively adjusted to fit according to different diameters of the rotor 3, which can play a role in adapting to the grooves 4, effectively adapting to the surface of the rotor 3, and further playing a role in comprehensively cleaning the rotor 3. At the same time, installing a support rod 10 can play a role in buffering and protecting the scraper 9. When the scraper 9 reaches the bottom during cleaning, the support rod 10 will contact the bottom first, thereby increasing the resistance and protecting the scraper 9.

[0051] By designing the scraper 9 to be arc-shaped and bent downward, when more and more low-temperature guar gum fracturing fluid is scraped off by the scraper 9, the arc-shaped scraper 9 can play a role in guiding the low-temperature guar gum fracturing fluid downward, so that the low-temperature guar gum fracturing fluid falls back into the implement at the bottom for recycling. At the same time, the subsequent first cleaning cotton 11 can play a role in secondary cleaning, thus achieving a better cleaning effect. When the scraper 9 moves to the groove 4 of the rotor 3 with the first cleaning cotton 11, at this time, the spring 14 in the storage groove 12 restores its elasticity, and the spring 14 drives the sliding rod 13 to slide away from the scraper 9, so that one end of the scraper 9 drives the first cleaning cotton 11 to enter the groove 4 of the rotor 3, making the surface of the first cleaning cotton 11 contact the groove 4, thereby achieving a better cleaning effect and being able to clean the recessed part. When the end of the scraper 9 needs to leave the groove 4, the rotating ball 15 at one end of the sliding rod 13 can play a role in rotational guidance, enabling the sliding rod 13 to slide and contract into the storage groove 12, thus facilitating leaving the groove 4 and avoiding getting stuck.

[0052] When the support rod 10 contacts the chassis 5 at the bottom of the rotor 3, the semi-circular support rod 10 and the roller 16 will contact the chassis 5. The roller 16 plays a role in assisting the rotational guidance, enabling the support rod 10 to drive the scraper 9 to rotate towards the sliding block 8. As a result, the end of the scraper 9 away from the sliding block 8 contacts the surface of the chassis 5, thereby scraping and cleaning the chassis 5. Moreover, when the support rod 10 contacts the chassis 5, it will be squeezed and then slide into the chute 17 through the slider 18, thereby squeezing the gas in the chute 17, causing the gas in the chute 17 to be ejected through the air outlet pipe 19, thus achieving the effect of blowing and cleaning the surface of the rotor 3. When the support rod 10 contacts the chassis 5, it will bring the bottom of the push plate 20 into contact with the chassis 5. At this time, the push plate 20 will be squeezed and pushed by the chassis 5, and then slide into the placement groove 21, causing the top of the push plate 20 to contact and push the bottom surface of the support plate 30, so that the support plate 30 drives the second cleaning cotton 22 to slide out of the placement groove 21, making the surface of the second cleaning cotton 22 contact the surface of the chassis 5, thereby playing a role in cleaning the chassis 5.

[0053] By setting the placement groove 21 to be inclined, when the support plate 30 slides, since the support plate 30 is made of rubber, it will be stuck in the placement groove 21, thereby fixing the second cleaning cotton 22. As a result, when the second cleaning cotton 22 contacts the surface of the chassis 5, it will not slide and contract into the placement groove 21 due to extrusion, and thus can achieve a more efficient cleaning effect. When the push plate 20 moves, it will bring the block 25 at the top into the slot 24 of the support plate 30, thereby enabling the push plate 20 to better push the support plate 30 to slide. When the block 25 is inserted into the slot 24, it will contact the elastic plate, and the elastic cloth 26 is squeezed and deformed between the slot 24 and the block 25, thereby playing a role in increasing friction. At the same time, when the block 25 leaves the slot 24, the elastic cloth 26 plays a role in preventing dust from entering the slot 24.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing, characterized in that, the method comprises the following steps: S1: Weigh guar gum, bactericide, swelling inhibitor, flowback aid, foaming agent, gel breaker promoter, crosslinking agent, gel breaker, mannanase and water respectively according to the weight parts of each raw material; S2: Import each raw material into a blender according to the proportion for mixing and stirring processing, and put the obtained low-temperature guar gum fracturing fluid into a viscometer (1) for detection, so that the chassis (5) enters into the low-temperature guar gum fracturing fluid, and at the same time, the groove (4) on the surface of the rotor (3) is flush with the surface of the low-temperature guar gum fracturing fluid. After passing the inspection, during the process of the viscometer (1) starting to rise with the rotor (3), use the scraper (9) arranged on the viscometer (1) to scrape and clean the low-temperature guar gum fracturing fluid adhering to the surface of the rotor (3); S3: Put the qualified low-temperature guar gum fracturing fluid into a centrifuge for centrifugation treatment, extract a part of the centrifuged low-temperature guar gum fracturing fluid and put it into a test tube, and observe the compatibility of the centrifuged low-temperature guar gum fracturing fluid after standing.

2. The preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 1, characterized in that: A display screen (2) is arranged on the surface of the viscometer (1), a rotor (3) is clamped on one side of the viscometer (1), a groove (4) is arranged on the surface of the rotor (3), a chassis (5) is fixedly installed at the bottom of the rotor (3), two fixing plates (6) are symmetrically and fixedly installed on the bottom surface of the viscometer (1), a rectangular frame (7) is fixedly installed on the side surfaces of the two fixing plates (6) close to each other, a sliding block (8) is slidably connected inside the rectangular frame (7) through an elastic member, one end of the sliding block (8) far away from the rectangular frame (7) is rotatably connected with a rubber scraper (9) through a torsion spring, and a support rod (10) is arranged at the bottom of the scraper (9).

3. The preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 2, characterized in that, The cross section of the scraper (9) is arc-shaped, the free end of the scraper (9) is bent downward, and a first cleaning cotton (11) is arranged at the top of the scraper (9) far away from the sliding block (8).

4. The preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 3, characterized in that, A receiving groove (12) is arranged at the top of the scraper (9), a plurality of springs (14) are fixedly installed inside the receiving groove (12), the other ends of the springs (14) are fixedly installed with sliding rods (13), the sliding rods (13) are slidably connected with the receiving groove (12), and one end of the sliding rod (13) far away from the spring (14) is rotatably connected with a rotating ball (15).

5. The preparation method of a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 4, characterized in that, The cross-section of the support rod (10) is semi-circular. A plurality of rollers (16) are rotatably connected to the bottom of the support rod (10). A chute (17) penetrating through itself is formed at the top of the scraping plate (9). A slider (18) is hermetically and slidably connected inside the chute (17). The bottom of the slider (18) is fixedly connected to the support rod (10). An air outlet pipe (19) is fixedly installed at the top of the chute (17).

6. A method for preparing a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 5, characterized in that, A placement groove (21) penetrating through itself is formed at the top of the scraping plate (9). A support plate (30) is slidably connected inside the placement groove (21). A second cleaning cotton (22) is provided at the top of the support plate (30). A push plate (20) is slidably connected inside the support rod (10) through an elastic member. The bottom end of the push plate (20) protrudes from the support rod (10).

7. A method for preparing a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 6, characterized in that, The inner wall of the placement groove (21) is inclined. The top of the placement groove (21) is narrower than the bottom. An "L"-shaped limit block (23) is fixedly installed at the bottom of the inner wall of the placement groove (21).

8. A method for preparing a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 7, characterized in that, A clamping groove (24) is formed at the bottom of the support plate (30). A clamping block (25) made of rubber is fixedly installed at the top of the push plate (20). An elastic cloth (26) is fixedly installed on the inner wall of the clamping groove (24).

9. A method for preparing a low-temperature guar gum fracturing fluid for oil and gas well fracturing according to claim 8, characterized in that, Magic tape female surfaces (29) are installed at the bottoms of the first cleaning cotton (11) and the second cleaning cotton (22). Rectangular grooves (27) are formed at the tops of the scraping plate (9) and the support plate (30). Magic tape male surfaces (28) are fixedly installed inside the rectangular grooves (27).

10. An application of a low-temperature guar gum fracturing fluid for oil and gas well fracturing. This application uses the low-temperature guar gum fracturing fluid for oil and gas well fracturing described in claim 1, characterized in that, The low-temperature guar gum fracturing fluid is used for fracturing and reforming oil and gas layers.

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