A solid waste-based reinforcing material for well cementing and a preparation method thereof

Abstract

The application discloses a solid-waste-based reinforcing material for well cementing and a preparation method thereof, and the reinforcing material comprises 10-20wt% of active component A, 60wt% of active component B and 20-30wt% of reinforcing component in percentage by weight, wherein the active component A is formed by mixing and reacting calcium carbide slag, biomass slag and aerated concrete waste at a mass ratio of (3-5):4:1. The application selects a large amount of solid waste as raw materials for preparation, which helps to reduce environmental pressure, has the characteristics of green environmental protection and low cost, and the prepared solid-waste-based reinforcing material for well cementing can be used to improve the early strength and channeling prevention capacity of well cementing stone and has good adaptability to oil well cement in a low-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of oil and gas resource development technology, specifically to a solid waste-based reinforcing material for cementing wells and its preparation method. Background Technology

[0002] With the rapid development of industrialization and urbanization, the amount of solid waste generated continues to increase, posing a significant challenge to environmental protection and sustainable development. Therefore, research on technologies and applications for the collection, treatment, and resource utilization of industrial solid waste is of great importance. The development and application of resource utilization technologies can transform solid waste into renewable resources, achieving recycling. However, the efficiency of these technologies is severely limited by objective economic conditions. The co-processing of multi-source solid waste to prepare functional materials represents one new approach to the resource utilization of solid waste.

[0003] China possesses abundant offshore oil and gas resources with enormous exploration and development potential. Vigorously developing these resources will help promote and improve my country's oil production, providing a strong energy guarantee for the sustained and healthy growth of the Chinese economy. Future oil energy development will gradually shift from shallow water to deep water, making the research and development of deep-water oil and gas extraction technologies particularly important. The low-temperature environment encountered in deep-water cementing severely delays the hydration of oil well cement, resulting in excessively long setting times. Currently, adding early-strength agents is the main method for shortening cement setting time and improving the early strength of cement stone in low-temperature cementing. However, most early-strength agents suffer from poor early-strength effects and deterioration of engineering properties such as cement slurry fluidity, making it difficult to meet the requirements of deep-water cementing. Therefore, developing new low-temperature early-strength materials for deep-water low-temperature cementing is of great significance. Summary of the Invention

[0004] To overcome the aforementioned technical difficulties of low-temperature cementing slurry, this invention provides a solid waste-based reinforcing material for cementing and its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] On one hand, the present invention provides a solid waste-based reinforcing material for cementing wells, comprising the following raw materials by weight percentage: 10-20 wt% active component A, 60 wt% active component B and 20-30 wt% reinforcing component, wherein the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of (3-5):4:1.

[0007] Furthermore, the preparation method of the active component A is as follows:

[0008] Sa1. Place carbide slag, biomass slag and aerated concrete waste in a ball mill jar at a mass ratio of (3-5):4:1 and wet grind them with a liquid-to-material ratio of 0.8 to 1.2 to obtain slurry A.

[0009] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant and stabilizer from the solid phase of slurry A and stir to obtain slurry B;

[0010] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A;

[0011] Preferably, the wet milling speed in Sa1 is 300-500 rpm, and the wet milling time is 72 h;

[0012] Preferably, the stirring temperature in Sa2 is 60–80°C, and the stirring time is 48–72 h.

[0013] Furthermore, the dispersant stabilizer is a mixture of ketaldehyde condensate and microcrystalline cellulose.

[0014] Furthermore, the calcium carbide slag has a CaO content of 65-70 wt% and a pH of 12-13.

[0015] Furthermore, the biomass slag has a SiO2 content ≥ 65wt%, an Al2O3 content ≥ 15wt%, and a particle size less than 325 mesh.

[0016] Furthermore, the aerated concrete waste is composed of tobermullite, semi-crystalline CSH(I), CSH gel and silica, and is pulverized and ground to a fineness of less than 600 mesh.

[0017] Furthermore, the active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:(1-2);

[0018] Preferably, the modified zirconium silicon slag has a SiO2 content ≥90wt%, a neutral pH, and a powder particle size of less than 325 mesh;

[0019] Preferably, the ferrosilicon manganese slag has a particle size of less than 325 mesh, a SiO2 content of 35-40 wt%, an Al2O3 content of 9-12 wt%, a CaO content of 25-28 wt%, and a MgO content of 6-11 wt%.

[0020] Preferably, the SiO2 content of the phosphorus slag is 35-40 wt%, and the CaO content is 42-48 wt%.

[0021] Preferably, the alkaline residue has a CaCO3 content of 40-45 wt%, a CaSO4 content of 7-10 wt%, and a CaCl2 content of 10-14 wt%.

[0022] Furthermore, the modified zirconium silicon slag is made into slurry C from zirconium silicon slag. Slurry C is neutralized, washed with water, and impurity removed, and then subjected to solid-liquid separation. The product is obtained by high-temperature drying and grinding.

[0023] Furthermore, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2;

[0024] Preferably, the purity of the lithium silicate is greater than 98 wt%;

[0025] Preferably, the purity of the aluminum sulfate is greater than 98 wt%.

[0026] On the other hand, the present invention provides a method for preparing a solid waste-based reinforcing material for cementing, comprising the following steps:

[0027] S1. Mix the active component A and the reinforcing component to obtain powder A;

[0028] S2. Place the active component B in a ball mill jar and ball mill it to obtain powder B;

[0029] S3. Powder A and powder B are pneumatically mixed to obtain solid waste-based reinforcing material for cementing.

[0030] Preferably, in step S2, the ball milling speed is 300-500 rpm and the ball milling time is 5-8 h; more preferably, the ball milling speed is 500 rpm and the ball milling time is 6 h.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This invention uses solid waste as raw material for preparation, which helps to reduce environmental pressure and has the characteristics of being green, environmentally friendly, and low-cost. This invention realizes the comprehensive utilization of solid wastes such as zirconium silicon slag, ferromanganese slag, and biomass furnace slag, increases the amount of solid waste disposal, and reduces the waste of land resources and environmental pollution caused by solid waste stockpiling.

[0033] 2. The solid waste-based reinforcing material for cementing of the present invention can be used to improve the early strength and anti-channeling ability of cementing stone in low temperature environment and has good compatibility with oil well cement.

[0034] 3. The active component A of the solid waste-based reinforcing material for cementing in this invention is generated by reacting carbide slag, biomass slag and aerated concrete waste under wet grinding conditions to produce hydrated calcium silicate and hydrated calcium aluminosilicate. The aerated concrete waste contains a large amount of tobermorite, which can serve as nucleation sites for calcium silicate and hydrated calcium aluminosilicate, greatly accelerating the formation of hydrated calcium silicate and hydrated calcium aluminosilicate and promoting the cement hydration reaction.

[0035] 4. The solid waste-based reinforcing material for cementing of the present invention can provide an alkaline environment for the initial hydration reaction of cement, thereby promoting the cement hydration reaction on the one hand; and on the other hand, activating the activity of active component B, promoting the activation and decomposition of solid waste residue in active component B, and promoting the Si 4+ Al 3+ and Ca 2+ Plasma release accelerates the formation of hydration products. Furthermore, in this invention, active component A acts as a seed crystal for hydrated calcium silicate and hydrated calcium aluminosilicate in the early stages of hydration, providing a good nucleation effect during cement hydration, inducing the formation of hydrated calcium silicate and hydrated calcium aluminosilicate during cement hydration, promoting cement hydration, and thus improving the early strength of cement.

[0036] 5. The active component B in the solid waste-based reinforcing material for cementing of the present invention contains a large number of amorphous SiO2 particles, which are highly active and can quickly react with the cement hydration product Ca(OH)2 to accelerate cement hydration. At the same time, the active component B also contains a small amount of MgO and CaSO4, which can promote the crystallization of ettringite through synergistic effect with the reinforcing component, and can also form Mg(OH)2 during cement hydration to enhance the bonding and sealing properties of the cementing stone, thereby improving the anti-channeling ability of the cementing stone.

[0037] 6. The reinforcing component in the solid waste-based reinforcing material for cementing of this invention can react with free hydroxide ions (OH-). - ) and calcium ions (Ca) in the system 2+ The reaction produces silicate cement and calcium silicate, which fill the micropores and gaps in the hydration products, thereby increasing the matrix density. The generated silicate cement and calcium silicate, through a synergistic effect with active component A, further promote the formation of hydrated calcium silicate and hydrated calcium aluminosilicate; the reinforcing component also works with various ions released by active component B to promote the crystallization of ettringite. Due to the large amount of Si in the system... 4+ Al 3+ and Ca 2+ The consumption of plasma further promotes cement hydration and the dissociation and release of active component B, thereby promoting early strength formation. In addition, the Li released by lithium silicate... +It accelerates the destruction of the early hydration product film on cement particles, speeding up the hydration process; and the formed cement hydration product Ca(OH)2 can activate the activity of solid waste-based reinforcing materials for cementing cement and react with them, promoting the occurrence of hydration reaction. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0039] The following examples and comparative examples all use cement slurry prepared according to GB / T19139 standard, where Grade G oil well cement was provided by Jiahua Special Cement Co., Ltd. The solid waste-based reinforcing materials used in the cementing were prepared according to the following steps:

[0040] S1. Mix the active component A and the reinforcing component to obtain powder A;

[0041] S2. Place active component B in a ball mill jar and ball mill at a speed of 500 rpm for 6 hours to obtain powder B.

[0042] S3. Powder A and powder B are pneumatically mixed using a pneumatic mixing device to obtain solid waste-based reinforcing material for cementing.

[0043] Example 1

[0044] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 1 below:

[0045] Table 1

[0046] raw material Weight percentage (wt%) Active component A 10 Active component B 60 Reinforcing components 30

[0047] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0048] In this embodiment, the preparation method of active component A is as follows:

[0049] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 400 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.0 to obtain slurry A.

[0050] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant and stabilizer from the solid phase of slurry A and stir. The stirring temperature is 80℃ and the stirring time is 72h to obtain slurry B.

[0051] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0052] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0053] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0054] The above raw materials were prepared according to the proportions in Table 1 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 1# for cementing.

[0055] Example 2

[0056] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 2 below:

[0057] Table 2

[0058]

[0059]

[0060] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0061] In this embodiment, the preparation method of active component A is as follows:

[0062] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 400 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.0 to obtain slurry A.

[0063] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant stabilizer from the solid phase of slurry A and stir. The stirring temperature is 80℃ and the stirring time is 72h to obtain slurry B.

[0064] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0065] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0066] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0067] The above raw materials were prepared according to the proportions in Table 2 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 2# for cementing.

[0068] Example 3

[0069] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 3 below:

[0070] Table 3

[0071] raw material Weight percentage (wt%) Active component A 20 Active component B 60 Reinforcing components 20

[0072] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0073] In this embodiment, the preparation method of active component A is as follows:

[0074] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 400 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.0 to obtain slurry A.

[0075] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant stabilizer from the solid phase of slurry A and stir. The stirring temperature is 80℃ and the stirring time is 72h to obtain slurry B.

[0076] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0077] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0078] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0079] The above raw materials were prepared according to the proportions in Table 3 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 3# for cementing.

[0080] Example 4

[0081] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 4 below:

[0082] Table 4

[0083] raw material Weight percentage (wt%) Active component A 20 Active component B 60 Reinforcing components 20

[0084] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0085] In this embodiment, the preparation method of active component A is as follows:

[0086] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 400 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.0 to obtain slurry A.

[0087] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant stabilizer from the solid phase of slurry A and stir. The stirring temperature is 80℃ and the stirring time is 72h to obtain slurry B.

[0088] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0089] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:2.

[0090] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0091] The above raw materials were prepared according to the proportions in Table 4 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 4# for cementing.

[0092] Example 5

[0093] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 5 below:

[0094] Table 5

[0095] raw material Weight percentage (wt%) Active component A 20 Active component B 60 Reinforcing components 20

[0096] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 3:4:1.

[0097] In this embodiment, the preparation method of active component A is as follows:

[0098] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled in a mass ratio of 3:4:1. The wet milling speed was 400 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.0 to obtain slurry A.

[0099] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant stabilizer from the solid phase of slurry A and stir. The stirring temperature is 80℃ and the stirring time is 72h to obtain slurry B.

[0100] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0101] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0102] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0103] The above raw materials were prepared according to the proportions in Table 5 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 5# for cementing.

[0104] Example 6

[0105] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 6 below:

[0106] Table 6

[0107] raw material Weight percentage (wt%) Active component A 20 Active component B 60 Reinforcing components 20

[0108] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0109] In this embodiment, the preparation method of active component A is as follows:

[0110] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 300 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 0.8 to obtain slurry A.

[0111] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant and stabilizer from the solid phase of slurry A and stir. The stirring temperature is 60℃ and the stirring time is 60h to obtain slurry B.

[0112] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0113] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0114] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0115] The above raw materials were prepared according to the proportions in Table 6 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 6# for cementing.

[0116] Example 7

[0117] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcing material for cementing in this embodiment is shown in Table 7 below:

[0118] Table 7

[0119] raw material Weight percentage (wt%) Active component A 20 Active component B 60 Reinforcing components 20

[0120] In this embodiment, the active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0121] In this embodiment, the preparation method of active component A is as follows:

[0122] Sa1. Carbide slag, biomass slag and aerated concrete waste were placed in a ball mill jar and wet-milled at a mass ratio of 5:4:1. The wet milling speed was 500 rpm and the wet milling time was 72 h. The liquid-to-material ratio was 1.2 to obtain slurry A.

[0123] Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant and stabilizer from the solid phase of slurry A and stir. The stirring temperature is 70℃ and the stirring time is 48h to obtain slurry B.

[0124] Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0125] In this embodiment, active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:1.

[0126] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0127] The above raw materials were prepared according to the proportions in Table 7 and the relevant steps of the preparation method of solid waste-based reinforcing material for cementing provided by the present invention to obtain solid waste-based reinforcing material 7# for cementing.

[0128] Comparative Example 1

[0129] This comparative example is a blank group without any early strength additives (i.e., the solid waste-based reinforcing material of this invention).

[0130] Comparative Example 2

[0131] This comparative example is identical to Example 1 except that active component A does not contain aerated concrete waste.

[0132] Comparative Example 3

[0133] This comparative example is identical to Example 1 except that the active component B does not contain alkali residue.

[0134] Comparative Example 4

[0135] This comparative example is identical to Example 1 except that the active component B does not contain ferrosilicon manganese slag.

[0136] Comparative Example 5

[0137] This comparative example is identical to Example 1 except that the reinforcing component does not contain lithium silicate.

[0138] Test case

[0139] The solid waste-based reinforcing material in Examples 1-7 and Comparative Examples 2-5 was added at 5 wt% of the mass of Grade G oil well cement. Comparative Example 1 did not add any early-strength additives (i.e., solid waste-based reinforcing material). Cement slurry was prepared according to GB / T 19139-2003 standard with a water-cement ratio of 0.44. The engineering performance of each cement slurry, including water loss, fluidity, anti-channeling coefficient, thickening time, and compressive strength at different curing temperatures, was tested. The results are shown in Tables 8 and 9, respectively.

[0140] Table 8

[0141]

[0142] According to the data in Table 8, the cement slurry prepared in Examples 1 to 7 can meet the construction requirements in terms of water loss and fluidity. The thickening time of the slurry is greatly shortened, indicating that the present invention can be well adapted to cement slurry without affecting the construction performance of the cement slurry. The SPN value for evaluating the anti-gas channeling performance of the cement slurry shows that the reinforcing material of the present invention can reduce the SPN value and improve the anti-gas channeling performance of the cement slurry. Data from Comparative Examples 2 to 5 show that all data for Comparative Examples 2 to 5 are better than those for Comparative Example 1. However, compared with Example 1, the thickening time of the cement slurry in Comparative Examples 2 to 5 is significantly prolonged, and the anti-gas channeling ability of the slurry is greatly reduced.

[0143] Table 9

[0144]

[0145] As shown in Table 9, the reinforcing material of the present invention can significantly improve the compressive strength of Grade G oil well cement under low-temperature conditions, indicating that the reinforcing material of the present invention has excellent low-temperature early strength effect, which is beneficial to shortening the cementing waiting time of shallow oil and gas wells. The cement stone formed by Comparative Examples 2 to 5 has a much higher compressive strength than that of Comparative Example 1, but its compressive strength is significantly lower than that of Example 1, indicating that the low-temperature early strength effect of the reinforcing materials formed by Comparative Examples 2 to 5 is weaker.

[0146] As can be seen from the above embodiments, by adopting the technical solution of the present invention and adding the solid waste-based reinforcing material for cementing, the workability of the cement slurry is not affected, and the early hydration process of the cement is significantly promoted, greatly improving the strength development rate of the cement slurry. This is beneficial for preventing low-temperature shallow water and gas channeling and improving cementing quality. Furthermore, the components of the reinforcing material of the present invention have synergistic effects; the absence of any one of them would prevent the achievement of the intended effect of this application.

[0147] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. A solid waste-based reinforcing material for cementing wells, characterized in that, The raw materials include the following by weight percentage: 10-20 wt% active component A, 60 wt% active component B and 20-30 wt% reinforcing component, wherein active component A is formed by mixing and reacting carbide slag, biomass slag and aerated concrete waste in a mass ratio of (3-5):4:1; The active component B is composed of modified zirconium silicon slag, silicomanganese slag, phosphorus slag, and alkali slag mixed in a mass ratio of 3:2:1:(1-2); The reinforcing component is a mixture of lithium silicate and aluminum sulfate in a mass ratio of 1:

2.

2. The solid waste-based reinforcing material for cementing as described in claim 1, characterized in that, The preparation method of the active component A is as follows: Sa1. Place carbide slag, biomass slag and aerated concrete waste in a ball mill jar at a mass ratio of (3-5):4:1 and wet grind them with a liquid-to-material ratio of 0.8~1.2 to obtain slurry A. Sa2. Place slurry A in a sealed mixing tank, add 1 wt% of the dispersant and stabilizer from the solid phase of slurry A and stir to obtain slurry B; Sa3. Place slurry B in a centrifuge for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A; The wet grinding speed in Sa1 is 300~500 rpm, and the wet grinding time is 72h; The stirring temperature in Sa2 is 60~80℃, and the stirring time is 48~72h.

3. The solid waste-based reinforcing material for cementing as described in claim 2, characterized in that, The dispersing stabilizer is a mixture of ketaldehyde condensate and microcrystalline cellulose.

4. The solid waste-based reinforcing material for cementing as described in claim 1, characterized in that, The carbide slag has a CaO content of 65-70 wt% and a pH of 12-13.

5. The solid waste-based reinforcing material for cementing as described in claim 1, characterized in that, The biomass slag has a SiO2 content ≥ 65wt%, an Al2O3 content ≥ 15wt%, and a particle size less than 325 mesh.

6. The solid waste-based reinforcing material for cementing as described in claim 1, characterized in that, The aerated concrete waste is composed of tobermullite, semi-crystalline CSH(I), CSH gel and silica, and is pulverized and ground to a fineness of less than 600 mesh.

7. A solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The modified zirconium silicon slag has a SiO2 content of ≥90wt%, a neutral pH, and a powder particle size of less than 325 mesh.

8. A solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The ferrosilicon slag has a particle size of less than 325 mesh, a SiO2 content of 35-40 wt%, an Al2O3 content of 9-12 wt%, a CaO content of 25-28 wt%, and a MgO content of 6-11 wt%.

9. A solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The phosphorus slag has a SiO2 content of 35-40 wt% and a CaO content of 42-48 wt%.

10. A solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The alkaline residue has a CaCO3 content of 40-45 wt%, a CaSO4 content of 7-10 wt%, and a CaCl2 content of 10-14 wt%.

11. A solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The modified zirconium silicon slag is made into slurry C from zirconium silicon slag. Slurry C is neutralized, washed with water, and impurity removed, then subjected to solid-liquid separation, and finally dried and ground at high temperature to obtain the product.

12. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that, The purity of the lithium silicate is greater than 98 wt%; the purity of the aluminum sulfate is greater than 98 wt%.

13. A method for preparing a solid waste-based reinforcing material for cementing according to any one of claims 1 to 12, characterized in that, Includes the following steps: S1. Mix the active component A and the reinforcing component to obtain powder A; S2. Place the active component B in a ball mill jar and ball mill it to obtain powder B; S3. Powder A and powder B are pneumatically mixed to obtain solid waste-based reinforcing material for cementing.

14. The method for preparing a solid waste-based reinforcing material for cementing according to claim 13, characterized in that, In step S2, the ball milling speed is 300~500 rpm and the ball milling time is 5~8 hours.

15. A method for preparing a solid waste-based reinforcing material for cementing according to claim 14, characterized in that, The ball milling speed was 500 rpm, and the ball milling time was 6 hours.

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