Slurry containing bentonite and preparation method and application thereof

Abstract

The invention provides bentonite-containing slurry as well as a preparation method and application thereof, and relates to the field of slurry. The bentonite-containing slurry is prepared from the following raw materials in percentage by mass: 6%-11% of clay, 0.3%-0.4% of a dispersing agent, 0.03%-0.06% of a tackifier and 89%-92% of water, wherein the total mass of the raw materials is 100%; the clay comprises bentonite. The slurry performance is improved, frequent slurry adjustment is reduced, abrasion of a sand layer to flow passage components is reduced, the slurry performance and stability are improved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The present application relates to the field of mud, and in particular to a mud containing bentonite, a preparation method thereof, and an application thereof. Background Art

[0002] The main environmental challenges facing current mud technology lie in contamination, non-degradability, and difficulty in handling. Traditional mud often contains oil-based components, heavy metal additives (such as chromium and lead), and chemical flocculants. These substances can easily leach into soil and groundwater during drilling and construction, causing long-term ecological toxicity and threatening the survival of plants and animals. Oil-based mud, in particular, despite its superior performance, can take decades to degrade, and its hydrocarbons can accumulate in the food chain, posing health risks to humans. Furthermore, the high pH, ​​high salinity, and high suspended matter content of waste mud make it difficult to directly discharge. Conventional treatment methods such as landfilling or solidification not only consume land resources but also pose the risk of secondary leakage of pollutants. Treatment processes such as chemical destabilization and centrifugal separation face bottlenecks of high energy consumption and high costs, leading some companies to discharge in violation of regulations. With increasingly stringent environmental regulations, breakthroughs are urgently needed in the development of biodegradable alternatives to existing mud systems to reduce cumulative damage to ecosystems.

[0003] In addition, the existing mud contains sand or hard particles, which will cause significant wear to the flow components (such as pumps, valves, pipes, nozzles, etc.).

[0004] Based on this, a new mud is provided to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a slurry containing bentonite and its preparation method and application to solve the above problems.

[0006] To achieve the above objectives, the present application provides a first aspect of a bentonite-containing slurry, wherein the raw materials, calculated based on the total mass as 100%, include: Clay 6%-11%, dispersant 0.3%-0.4%, tackifier 0.03%-0.06%, water 89%-92%; The clay includes bentonite.

[0007] Optionally, the clay also includes ordinary clay.

[0008] Optionally, the common clay includes one or more of kaolin, illite clay and chlorite clay.

[0009] Optionally, the dispersant comprises sodium carbonate.

[0010] Optionally, the viscosity increasing agent comprises sodium-carboxymethyl cellulose.

[0011] Optionally, the calcium ion concentration of the water is less than 100 ppm, and the sodium ion concentration is less than 500 ppm.

[0012] Optionally, the pH value of the water is 7-9.

[0013] Optionally, the pH of the bentonite-containing slurry is 7-9.

[0014] A second aspect of the present application provides a method for preparing the bentonite-containing slurry, comprising: The raw materials are mixed to prepare the product.

[0015] The third aspect of the present application provides an application of the bentonite-containing mud in volcanic ash formations.

[0016] Compared with the prior art, the advantages of this application include: The bentonite-containing mud provided in the present application improves mud performance, reduces frequent mud adjustments, reduces the wear of the sand layer on the flow-through components, improves mud performance and stability, and helps improve construction efficiency and quality through the use of a new type of composite bentonite environmentally friendly mud; the dispersant can improve the dispersibility of bentonite by destroying the cohesion between bentonite particles, thereby increasing the fluidity and sand-carrying capacity of the mud. Bentonite provides viscosity and stability, and the dispersant enables bentonite to form a uniform colloidal suspension in water, thereby enhancing the fluidity and stability of the mud and avoiding mud precipitation and coagulation. Bentonite provides basic cohesiveness for the mud, and the thickener improves the water holding capacity and stability of the mud, ensuring that the mud can maintain effective function in the formation for a long time; the dispersant ensures the dispersibility of the bentonite particles, while the thickener ensures that the mud does not flow and maintains appropriate viscosity, and can achieve a high viscosity and good fluidity balance in the mud, avoiding the mud being too viscous or having poor fluidity.

[0017] The method for preparing bentonite-containing mud provided in the present application is simple to operate and the raw materials are readily available.

[0018] The application provided by this application can solve the problem of pre-screening of mud in special formation conditions such as volcanic ash formations, reduce the chaos at the mud treatment site, speed up the construction progress, and carry out civilized production on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0020] Figure 1 This is a flow chart of the method for preparing the bentonite-containing slurry provided in Example 3. DETAILED DESCRIPTION

[0021] As used herein: "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0022] The conjunction "consisting of" excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim, rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0023] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed alone. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0024] In these examples, parts and percentages are by mass unless otherwise indicated.

[0025] "Parts by mass" refers to the basic unit of measurement used to express the mass ratio of multiple components. One part can represent any unit of mass, such as 1g or 2.689g. For example, if we say that the parts by mass of component A are a parts and the parts by mass of component B are b parts, this means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, we could say that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiplication factor). It's important to note that, unlike parts by mass, the sum of the parts by mass of all components is not limited to 100 parts.

[0026] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0027] In a first aspect, the present application provides a bentonite-containing slurry, wherein the raw materials, calculated based on the total mass as 100%, include: Clay 6%-11%, dispersant 0.3%-0.4%, tackifier 0.03%-0.06%, water 89%-92%; Optionally, based on the total mass of the raw materials of the bentonite-containing slurry being 100%, the clay may be 6%, 7%, 8%, 9%, 10%, 11%, or any value between 6% and 11%, the dispersant may be 0.3%, 0.35%, 0.4%, or any value between 0.3% and 0.4%, the viscosity enhancer may be 0.03%, 0.04%, 0.05%, 0.06%, or any value between 0.03% and 0.06%, and the water may be 89%, 90%, 91%, 92%, or any value between 89% and 92%. The clay includes bentonite.

[0028] It is important to note that this application provides a new type of mud that uses materials such as bentonite, dispersants, viscosity enhancers, and groundwater to produce high-quality, environmentally friendly mud. The advantage of this method is that it improves the performance and stability of the mud, helping to improve construction efficiency and quality.

[0029] It can also achieve zero discharge of waste mud by improving the mud performance, which has significant advantages for environmental protection and reduces pollution and waste of resources.

[0030] The prepared slurry containing bentonite is suitable for special geological conditions, such as volcanic ash strata or strata containing large particles. It solves the challenges in mud treatment and construction under these conditions and helps to improve construction efficiency and quality.

[0031] It can also reduce frequent mud adjustments. By improving the performance of the mud, the need for frequent mud adjustments can be reduced, which helps to reduce downtime and resource waste during construction and improve construction efficiency.

[0032] It should also be noted that bentonite is a special clay based on montmorillonite, which has thixotropy, swelling and colloidal properties. Adding an appropriate amount of bentonite powder can improve the performance indicators of the mud.

[0033] In some embodiments, the clay further comprises common clay.

[0034] In some embodiments, the common clay includes one or more of kaolin, illite clay, and chlorite clay.

[0035] It should be noted that the use of ordinary clay can reduce costs. By adding ordinary clay and bentonite to make slurry, high-quality wall protection mud can be prepared while reducing costs.

[0036] In some embodiments, the dispersant comprises sodium carbonate.

[0037] It's important to note that dispersants improve the dispersion of bentonite particles in water, allowing them to blend better with water, preventing them from clumping and settling, and ensuring sufficient fluidity in the mud. Dispersants accelerate the hydration of clay particles in the mud, thereby increasing the slurry yield and ensuring its continued stability. Sodium carbonate (soda ash) is used as a mud dispersant. Adding sodium carbonate to the mud enhances the hydration of clay particles, accelerating the dispersion of the clay and improving the slurry yield.

[0038] In some embodiments, the viscosity increasing agent comprises sodium-carboxymethylcellulose.

[0039] It should also be noted that thickener is the most important additive to improve the viscosity of the wall protection mud. It can increase the viscosity of the mud and reduce water loss, form a thin film on the surface of the soil layer to make the mud skin tough and improve the static shear force and bonding ability of the mud, so that a stable wall protection mud skin is formed on the trench wall.

[0040] In some embodiments, the water has a calcium ion concentration of less than 100 ppm and a sodium ion concentration of less than 500 ppm.

[0041] Optionally, the calcium ion concentration of the water can be 1 ppm, 10 ppm, 50 ppm, 99 ppm or any value less than 100 ppm, and the sodium ion concentration can be 1 ppm, 10 ppm, 50 ppm, 100 ppm, 200 ppm, 300 ppm, 400 ppm or any value less than 500 ppm.

[0042] In some embodiments, the water has a pH of 7-9.

[0043] Optionally, the pH value of the water can be 7, 8, 9 or any value between 7 and 9.

[0044] Preferably, the water comprises groundwater, which can be obtained by drilling a well.

[0045] In some embodiments, the pH of the bentonite-containing slurry is 7-9.

[0046] Optionally, the pH value of the bentonite-containing slurry may be 7, 8, 9 or any value between 7 and 9.

[0047] It should be noted that the bentonite-containing mud provided in this application has the following characteristics: ① a relatively low solid content; ② a certain selective flocculation effect; ③ strong chemical stability and sand-carrying capacity; ④ low density and low shear force; and ⑤ simple and quick preparation.

[0048] A second aspect of the present application provides a method for preparing the bentonite-containing slurry, comprising: The raw materials are mixed to prepare the product.

[0049] The third aspect of the present application provides an application of the bentonite-containing mud in volcanic ash formations.

[0050] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0051] Example 1 This embodiment provides a slurry containing bentonite and a preparation method thereof, and the specific steps are as follows: S1: Weigh the raw materials according to the mass ratio of bentonite (10%), dispersant sodium carbonate (0.35%), viscosity enhancer sodium-carboxymethyl cellulose (0.05%), and groundwater (89.65%); S2: Add water, bentonite and sodium carbonate into a stirring tank and stir thoroughly until the bentonite is completely dispersed; S3: Add sodium carboxymethyl cellulose and continue stirring until the slurry forms a uniform suspension (slurry containing bentonite).

[0052] Among them, the calcium ion concentration of groundwater is less than 100ppm, the sodium ion concentration is less than 500ppm, and the pH value of groundwater is 7.5.

[0053] Example 2 The difference from Example 1 is that the raw materials, based on the total mass of 100%, include 8.5% clay, 0.35% dispersant, 0.05% tackifier, and 91.1% water.

[0054] Example 3 The difference from Example 1 is that bentonite is replaced by a mixture of kaolin and bentonite in a mass ratio of 1:1. The specific preparation process is as follows: S1: Weigh the raw materials according to the mass ratio of bentonite (5%), kaolin (5%), dispersant sodium carbonate (0.35%), viscosity enhancer sodium-carboxymethyl cellulose (0.05%), and groundwater (89.65%); S2: Mixing bentonite and kaolin to obtain a clay mixture; S3: Add water, clay mixture and sodium carbonate into a stirring tank and stir thoroughly until the clay mixture is completely dispersed; S4: Add sodium carboxymethyl cellulose and continue stirring until the slurry forms a uniform suspension.

[0055] The preparation process of the bentonite-containing mud is as follows: Figure 1 shown.

[0056] Comparative Example 1 The difference from Example 1 is that only 10 wt % of bentonite is used, and the balance is water.

[0057] The above examples and comparative examples were tested for mud density, mud viscosity, mud sand content, and mud pH value. The specific test results are shown in Table 1.

[0058] Mud Gravity Test: Calibrate the instrument before use. Fill the mud cup with clean water. If the reading is not 1, adjust the specific gravity by increasing or decreasing the lever to balance the metal particles inside the cylindrical cover until the specific gravity reading is 1. Test Procedure: Fill the mud cup with the sampled mud, cover it, and wipe away any excess mud from the small opening. Then, place it on the stand and move the slider to keep the lever horizontal. Read the scale value to the left of the slider, which is the specific gravity of the sampled mud.

[0059] Mud viscosity test: Inject 700mL of clean water. If it takes 15 seconds for 500mL to flow out, it is standard and the instrument is qualified. After the instrument is calibrated, close the funnel and inject 700mL of clean water into the funnel. At the same time, open the funnel and use a stopwatch to time it. When the standard time for 500mL to flow out is 15 seconds, the instrument meets the requirements. Test operation: Block the outlet below the funnel with your finger, and use a measuring cup to pour 700mL of sampled mud through the filter into the funnel. Then open the outlet and let the mud flow out of the tube with an inner diameter of 5mm and a length of 100mm. Use a stopwatch to measure the time (s) required for 500mL to flow out, which is the mud viscosity.

[0060] Mud sand content testing: A mud sand meter is used to measure the sand content of mud, with the unit of measurement being percentage (%). To test, place 100mL of mud into a measuring cup, dilute with clean water, and filter through a filter screen. Rinse with water, and finally pour the remaining sand into a clean measuring cup. Allow the sand to settle vertically for one minute. Read the volume of sand from the scale on the measuring cup. The calculated percentage is the sand content of the mud.

[0061] Mud pH Testing: pH test paper is used to measure the pH of mud, with a reading range of 0-14. To test, place 100mL of mud into a measuring cup. Place a small strip of pH test paper in the slurry and slowly lower it into the slurry until it fully saturates and changes color. Once the color of the test paper stabilizes, remove it and compare it to the color scale. The corresponding value is the mud pH.

[0062] Table 1 Test

[0063] analyze: (1) Specific gravity and viscosity: The specific gravity and viscosity of Comparative Example 1 were significantly higher, indicating that the slurry was too viscous, which could easily lead to blockage during construction and reduce construction efficiency. In contrast, the specific gravity and viscosity of the slurries of Examples 1-3 were within a reasonable range, ensuring good fluidity and wall protection capabilities.

[0064] (2) Sand content: The sand content of comparative example 1 is abnormally high, reaching 15%, which indicates that its mud is prone to sedimentation of sand particles during construction, causing mud failure. The sand content of Examples 1-3 is only 3%, which can effectively maintain the stability of the mud and avoid mud problems during construction.

[0065] (3) pH value: The pH value of the mud in Comparative Example 1 is extremely low, only 5.5, which may lead to chemical instability of the mud and even affect the normal operation of the equipment; while the pH value of Examples 1-3 is stable at 8.0, which meets the construction requirements and ensures the stability of the mud.

[0066] (4) Mud stability: The mud in Example 1 is very easy to settle and stratify, showing very poor stability, which may lead to frequent adjustment of the mud during construction. However, the muds in Examples 1-3 show better stability and can maintain good results in long-term construction.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0068] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form distinct embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is intended solely to enhance understanding of the overall background of this application and should not be construed as an admission or any implication that such information constitutes prior art known to those skilled in the art.

Claims

1. A slurry containing bentonite, characterized in that: The raw materials, calculated based on the total mass as 100%, include: Clay 6%-11%, dispersant 0.3%-0.4%, tackifier 0.03%-0.06%, water 89%-92%; The clay includes bentonite.

2. The bentonite-containing slurry according to claim 1, characterized in that: The clay also includes common clay.

3. The bentonite-containing slurry according to claim 2, characterized in that: The common clay includes one or more of kaolin, illite clay and chlorite clay.

4. The bentonite-containing slurry according to claim 1, characterized in that The dispersant includes sodium carbonate.

5. The bentonite-containing slurry according to claim 1, characterized in that: The viscosity increasing agent includes sodium-carboxymethyl cellulose.

6. The bentonite-containing slurry according to claim 1, characterized in that: The calcium ion concentration of the water is less than 100 ppm, and the sodium ion concentration is less than 500 ppm.

7. The bentonite-containing slurry according to claim 1, characterized in that: The pH value of the water is 7-9.

8. The bentonite-containing slurry according to any one of claims 1 to 7, characterized in that: The pH of the bentonite-containing slurry is 7-9.

9. A method for preparing a bentonite-containing slurry according to any one of claims 1 to 8, characterized in that: include: The raw materials are mixed to prepare the product.

10. Use of the bentonite-containing slurry according to any one of claims 1 to 8 in volcanic ash formations.

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