Chemical consolidation plugging agent and preparation method thereof

Abstract

The invention provides a chemical consolidation plugging agent and a preparation method thereof. The chemical consolidation plugging agent comprises the following raw material components in parts by weight: 60-80 parts of active oxide; 20 to 40 parts of sulfate; 6-8 parts of a pH regulator; 8-10 parts of a water reducing agent; 5-7 parts of a thickening time control agent; 5-7 parts of a mineral admixture; 3-5 parts of an organic polymer; the raw material components are stirred and mixed according to the weight parts, and ball milling is performed after drying to obtain the chemical consolidation plugging agent product. The plugging agent provided by the invention is prepared from various inorganic materials and organic materials, has high hydration activity, can enter leakage channels of various sizes after forming plugging slurry in a drilling fluid, is gelled and solidified after entering a stratum, generates micro-expansion, can effectively plug the leakage channels, has good sealing performance, improves the loading capacity, and has high strength; after the plugging slurry is solidified, the hardness is proper, and drifting operation is easy to complete; the plugging agent is simple in preparation process, convenient to use, low in cost and wide in application range.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield drilling plugging, and relates to a chemical consolidation plugging agent and a preparation method thereof. Background Art

[0002] In the exploration and development of oil and gas wells, lost circulation is a frequently encountered technical problem. Lost circulation will increase drilling costs, seriously affect the speed and quality of drilling, and cause immeasurable damage to the reservoir. Therefore, effectively solving the problem of lost circulation is one of the keys to high-quality, efficient and low-cost drilling. To solve the problem of lost circulation, the main idea of ​​existing technology is to inject plugging materials into the formation to solve the problem of loss. Therefore, the selection of plugging materials is crucial to the success of plugging.

[0003] At present, domestic and foreign scholars have developed a variety of plugging materials to address the problem of well leakage. Among them, bridging plugging materials are the earliest plugging materials used, and they are highly praised for their safety, economy and simple operation process. However, their formula composition is complex, the particle size is difficult to match with the formation, the one-time plugging success rate is low, and they have poor temperature resistance, short validity period, and are very prone to re-leakage; the expansive resin plugging material also has the problem of difficulty in matching the material particle size with the formation cracks, and the strength of the resin material decreases significantly after absorbing water and swelling; the gel plugging material is expensive, and due to its strong retention capacity, it is difficult to enter the leaking layer without the condition of shut-in pressure; the high water loss plugging material cannot be used in mudstone well sections where the well wall is prone to instability, and the strength alone is difficult to meet the pressure requirements; cement plugging materials have high density, poor retention capacity, high construction risks, and are easy to "enema" or "flagpole". After consolidation, the strength is too high, and it is very easy to draw new holes in loose sandstone formations.

[0004] CN 115873566A discloses a bridging plugging material for drilling fluid and a preparation method thereof. The plugging material is composed of at least one of a metal material, an inorganic curable material and an organic curable material. The bridging plugging material is composed of at least one of a polyhedron with a regular shape, a polyhedron with an irregular shape, and a special-shaped body with an angle or a tip. The weight ratio of the three is (1-9):(0-1):(0-1). Each component in the plugging material is composed of multiple materials, wherein the inorganic curable material is hardened water glass or cement, and the organic curable material is a thermoplastic resin or a thermosetting resin. The material still has the defects of cement plugging material and resin plugging material, and the components are relatively complex, and it is not easy to form a uniform mixture.

[0005] CN 111434748A discloses an organic-inorganic hybrid high temperature resistant plugging gel for drilling and a preparation method thereof. The plugging gel is prepared from the following raw materials, wherein the components are, by weight, 0.3-1% polyacrylamide, 10-25% acrylamide, 5-20% sodium acrylate, 0.1-5% temperature resistant monomer, 0.01-0.5% initiator, 0.1-1% retarder, 0.1-0.5% emulsifier, 0.1-0.5% organic solvent, 0.5-3% fiber, 0.1-1% rubber powder, 0.1-2% modified silicon dioxide crosslinking agent, and the balance is water. The plugging agent belongs to the gel plugging agent, belongs to the liquid type, has complex ingredients, has a high water content, and has too strong retention capacity after forming the gel, making it difficult to match the leaking layer.

[0006] To sum up, the selection of the plugging agent composition during the drilling process also needs to be reasonably selected and matched according to the characteristics of the leaking formation, so that it can have a good match with the formation, have micro-expansion, can effectively block the leakage channel after consolidation, and has a strong pressure-bearing capacity. Summary of the invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a chemical consolidation plugging agent and a preparation method thereof. The chemical consolidation plugging agent is prepared with a variety of inorganic materials and organic materials, has high hydration activity, can gradually form a gelled product after forming a plugging slurry with the drilling fluid, produces micro-expansion, can effectively plug the leakage channel, has good sealing performance, and improves the pressure bearing capacity of the leakage formation, and has high strength.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In one aspect, the present invention provides a chemical consolidation plugging agent, which comprises the following raw material components by weight:

[0010]

[0011]

[0012] Among the above raw material components, the weight of the active oxide can be selected from 60 parts, 65 parts, 70 parts, 75 parts or 80 parts, etc., the weight of the sulfate can be selected from 20 parts, 25 parts, 30 parts, 35 parts or 40 parts, etc., the weight of the pH adjuster can be selected from 6 parts, 6.5 parts, 7 parts, 7.5 parts or 8 parts, etc., the weight of the water reducer can be selected from 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, etc., the weight of the setting agent can be selected from 5 parts, 5.5 parts, 6 parts, 5.5 parts or 7 parts, etc., the weight of the mineral admixture can be selected from 5 parts, 5.5 parts, 6 parts, 5.5 parts or 7 parts, etc., the weight of the organic polymer can be selected from 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc.; but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0013] In the present invention, in order to solve the problem of well leakage existing in the process of oil field drilling, a plugging agent is usually used for plugging. In the present invention, a variety of inorganic materials and organic materials are used to prepare the plugging agent, with active oxides and sulfates as the main components, and then supplemented with water reducers, coagulants, pH regulators, mineral admixtures and organic polymers, and the weight parts of each component are matched to form a plugging agent with high hydration activity, which can be directly added to the drilling fluid to form a plugging slurry, has good compatibility, and will not affect the drilling fluid; the plugging slurry can enter the leakage channels of various sizes, has good adaptability, and has good retention capacity. After entering the formation, it gradually gels and solidifies, produces micro-expansion, can effectively plug the leakage channel, has good sealing performance, and improves the pressure bearing capacity of the leakage formation, has high strength, and appropriate hardness, and is easy to complete the well clearance operation after plugging.

[0014] The following are preferred technical solutions of the present invention, but are not intended to be limitations of the technical solutions provided by the present invention. Through the following technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0015] As a preferred technical solution of the present invention, the active oxide includes light-burned active oxide.

[0016] Preferably, the active oxide comprises any one of aluminum oxide, calcium oxide or silicon dioxide, or a combination of at least two thereof. Typical but non-limiting examples of the combination include: a combination of aluminum oxide and calcium oxide, a combination of calcium oxide and silicon dioxide, a combination of aluminum oxide, calcium oxide and silicon dioxide, etc.

[0017] As a preferred technical solution of the present invention, the sulfate includes anhydrous sulfate.

[0018] Preferably, the sulfate comprises any one of anhydrous calcium sulfate, anhydrous sodium sulfate or anhydrous potassium sulfate, or a combination of at least two thereof. Typical but non-limiting examples of the combination include: a combination of anhydrous calcium sulfate and anhydrous sodium sulfate, a combination of anhydrous sodium sulfate and anhydrous potassium sulfate, a combination of anhydrous calcium sulfate, anhydrous sodium sulfate and anhydrous potassium sulfate, etc.

[0019] In the present invention, according to the selection of various raw material components in the chemical consolidation plugging agent, active oxides and sulfates are the main components, and the functions of the two are to serve as the main materials of the gelled product.

[0020] As a preferred technical solution of the present invention, the pH regulator includes any one of sodium citrate, sodium dihydrogen phosphate or citric acid, or a combination of at least two of them. Typical but non-limiting examples of the combination include: a combination of sodium citrate and sodium dihydrogen phosphate, a combination of sodium citrate and citric acid, a combination of sodium citrate, sodium dihydrogen phosphate and citric acid, and the like.

[0021] Preferably, the water reducer comprises any one of a polycarboxylic acid water reducer, a naphthalene water reducer or a wood calcium water reducer, or a combination of at least two of them. Typical but non-limiting examples of the combination include: a combination of a polycarboxylic acid water reducer and a naphthalene water reducer, a combination of a naphthalene water reducer and a wood calcium water reducer, a combination of a polycarboxylic acid water reducer, a naphthalene water reducer and a wood calcium water reducer, etc.; wherein, the wood calcium water reducer is the abbreviation of calcium lignin sulfonate water reducer.

[0022] As a preferred technical solution of the present invention, the coagulant comprises any one of calcium chloride, sodium methylene dinaphthalene sulfonate or dibutyl phthalate, or a combination of at least two of them. Typical but non-limiting examples of the combination include: a combination of calcium chloride and sodium methylene dinaphthalene sulfonate, a combination of sodium methylene dinaphthalene sulfonate and dibutyl phthalate, a combination of calcium chloride, sodium methylene dinaphthalene sulfonate and dibutyl phthalate, and the like.

[0023] Preferably, the mineral admixture comprises any one of slag powder, silica powder, limestone or kaolin, or a combination of at least two of them. Typical but non-limiting examples of the combination include: a combination of slag powder and silica powder, a combination of silica powder and limestone, a combination of limestone and kaolin, a combination of silica powder, limestone and kaolin, etc.

[0024] Preferably, the organic polymer comprises any one of polyanionic cellulose, sodium carboxymethyl cellulose or hydroxyethyl cellulose, or a combination of at least two thereof. Typical but non-limiting examples of the combination include: a combination of polyanionic cellulose and sodium carboxymethyl cellulose, a combination of sodium carboxymethyl cellulose and hydroxyethyl cellulose, a combination of polyanionic cellulose, sodium carboxymethyl cellulose and hydroxyethyl cellulose, and the like.

[0025] In the present invention, the organic polymer in the chemical consolidation plugging agent mainly functions to strengthen the strength of the gelled product.

[0026] On the other hand, the present invention provides a method for preparing the above-mentioned chemical consolidation plugging agent, the preparation method comprising the following steps:

[0027] The raw material components of the chemical consolidation plugging agent are stirred and mixed according to weight parts, dried and then ball-milled to obtain a chemical consolidation plugging agent product.

[0028] As a preferred technical solution of the present invention, the stirring and mixing temperature is 45-55°C, for example, 45°C, 46°C, 48°C, 50°C, 52°C, 54°C or 55°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable; the pressure is normal pressure.

[0029] Preferably, the stirring and mixing is carried out in a kneader.

[0030] As a preferred technical solution of the present invention, the stirring rate during the stirring and mixing is 100-200 r / min, for example, 100 r / min, 120 r / min, 140 r / min, 150 r / min, 160 r / min, 180 r / min or 200 r / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] Preferably, the stirring and mixing time is 3 to 6 hours, for example 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] As a preferred technical solution of the present invention, the drying is carried out in a drying oven.

[0033] Preferably, the drying temperature is 80-100°C, such as 80°C, 85°C, 90°C, 95°C or 100°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0034] Preferably, the drying time is 4 to 6 hours, for example 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] As a preferred technical solution of the present invention, the ball milling is carried out using a ball mill.

[0036] Preferably, the ball milling is dry ball milling.

[0037] Preferably, the ball milling time is 0.5 to 1 h, such as 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h or 1 h, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0038] Preferably, the particle size of the ball-milled product is greater than 325 mesh, such as 325 mesh, 350 mesh, 375 mesh, 400 mesh, 450 mesh or 500 mesh, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The plugging agent of the present invention is prepared from a variety of inorganic and organic materials, has high hydration activity, can be directly added to drilling fluid to form plugging slurry, can enter leakage channels of various sizes, has good adaptability, has good retention capacity, gradually gels and solidifies after entering the formation, produces micro-expansion, can effectively plug the leakage channel, has good sealing performance, and improves the pressure bearing capacity of the leakage formation, and has high strength;

[0041] (2) After the plugging agent of the present invention is added to the drilling fluid, it will not affect the performance of the drilling fluid during the plugging operation and the drilling process, and will not gel when stirred or flowing, thus ensuring the safety of transportation;

[0042] (3) The plugging slurry of the present invention has an appropriate hardness after solidification. After the plugging is successful, the well cleaning operation can be completed with a relatively small drilling pressure without forming new holes. In addition, the plugging agent is acid-soluble, which is helpful for unblocking after plugging.

[0043] (4) The plugging agent of the present invention has a simple preparation process, is easy to use, has a low cost, and has a wide range of applications. DETAILED DESCRIPTION

[0044] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention is further described in detail below. However, the following embodiments are only simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0045] The following are typical but non-limiting embodiments of the present invention:

[0046] Embodiment 1:

[0047] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0048]

[0049] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0050] The above-mentioned raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 50°C, the pressure is normal pressure, the stirring rate is 120r / min, and the stirring and mixing time is 5h. Then, they are added into a drying oven for drying. The drying temperature is 90°C and the time is 5h. Then, dry ball milling is carried out in a ball mill for 0.75h to obtain a chemical consolidation plugging agent product. The average particle size of the product is 400 mesh.

[0051] Embodiment 2:

[0052] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0053]

[0054] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0055] The above raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 45°C, the pressure is normal pressure, the stirring rate is 150r / min, and the stirring and mixing time is 4 hours. Then, they are added into a drying oven for drying. The drying temperature is 80°C and the time is 6 hours. Then, dry ball milling is carried out in a ball mill for 1 hour to obtain a chemical consolidation plugging agent product. The average particle size of the product is 375 mesh.

[0056] Embodiment 3:

[0057] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0058]

[0059] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0060] The above-mentioned raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 55°C, the pressure is normal pressure, the stirring rate is 100r / min, and the stirring and mixing time is 6 hours. Then, they are added into a drying oven and dried. The drying temperature is 100°C and the time is 4 hours. Then, dry ball milling is carried out in a ball mill for 0.5 hours to obtain a chemical consolidation plugging agent product. The average particle size of the product is 325 mesh.

[0061] Embodiment 4:

[0062] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0063]

[0064]

[0065] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0066] The above-mentioned raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 48°C, the pressure is normal pressure, the stirring rate is 200r / min, and the stirring and mixing time is 3h. Then, they are added into a drying oven for drying. The drying temperature is 85°C and the time is 5.5h. Then, dry ball milling is carried out in a ball mill for 0.6h to obtain a chemical consolidation plugging agent product. The average particle size of the product is 350 mesh.

[0067] Embodiment 5:

[0068] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0069]

[0070] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0071] The above raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 52°C, the pressure is normal pressure, the stirring rate is 150r / min, and the stirring and mixing time is 4.5h. Then, they are added into a drying oven for drying. The drying temperature is 95°C and the time is 4.5h. Then, dry ball milling is carried out in a ball mill for 0.8h to obtain a chemical consolidation plugging agent product. The average particle size of the product is 360 mesh.

[0072] Embodiment 6:

[0073] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0074]

[0075] The preparation method of the chemical consolidation plugging agent comprises the following steps:

[0076] The above raw material components are added into a kneader according to weight portions and stirred and mixed. The stirring and mixing temperature is 50°C, the pressure is normal pressure, the stirring rate is 130r / min, and the stirring and mixing time is 5.5h. Then, they are added into a drying oven for drying. The drying temperature is 90°C and the time is 6h. Then, dry ball milling is carried out in a ball mill for 0.7h to obtain a chemical consolidation plugging agent product. The average particle size of the product is 340 mesh.

[0077] Embodiment 7:

[0078] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0079]

[0080]

[0081] The preparation method of the chemical consolidation plugging agent refers to the method in Example 1.

[0082] Embodiment 8:

[0083] This embodiment provides a chemical consolidation plugging agent and a preparation method thereof, wherein the chemical consolidation plugging agent comprises the following raw material components in parts by weight:

[0084]

[0085] The preparation method of the chemical consolidation plugging agent refers to the method in Example 2.

[0086] Embodiment 9:

[0087]

[0088]

[0089] The preparation method of the chemical consolidation plugging agent refers to the method in Example 3.

[0090] The chemical consolidation plugging agent prepared in the above examples 1-9 was subjected to application tests, specifically including:

[0091] The chemical consolidation plugging agent in Example 1-9 is mixed with the drilling fluid to form a chemical consolidation plugging slurry, wherein the chemical consolidation plugging agent accounts for 25wt%, the drilling fluid accounts for 75wt%, and the formula of the drilling fluid is 4.0wt% bentonite + 0.2wt% soda ash + 0.15wt% caustic soda + 2.0wt% SN resin + 1.5wt% modified starch + 3.0wt% sulfonated asphalt + 0.1wt% xanthan gum + 32wt% barite, and the drilling fluid density is 1.30g / cm 3 ;

[0092] The various properties of chemical consolidation plugging slurry are tested separately, including:

[0093] Test Example 1

[0094] The rheological properties of the chemical consolidation plugging slurry were measured, including plastic viscosity (PV), dynamic shear force (YP), and static shear force (Gel) parameters. The chemical consolidation plugging slurry was stirred at a speed of 200 r / min at room temperature of 20°C, and the consolidation state was observed for 24 hours. The chemical consolidation plugging slurry was filled into a square plastic mold and cured at 80°C for 12 hours until it was completely consolidated. The consolidated body was then taken out and the compressive strength was tested using a uniaxial press. The results are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] As shown in Table 1, the viscosity and shear force of the drilling fluid increased after adding chemical consolidation plugging agent, but it still had good fluidity and thixotropy, and did not solidify when stirred at room temperature, indicating that the chemical consolidation plugging slurry was highly safe and conducive to the preparation and pumping of on-site plugging slurry; the uniaxial strength was high after curing at 80°C for 12 hours, which was conducive to the plugging of the leakage channel.

[0099] Test Example 2:

[0100] 80 mL of the chemical consolidation plugging slurry in the above Examples 1-9 was measured using a 100 mL measuring cylinder, and cured at 80° C. for 12 h, 24 h and 48 h, respectively. The linear expansion coefficients after consolidation were then tested, and the results are shown in Table 2.

[0101] Table 2

[0102]

[0103]

[0104] It can be seen from Table 2 that the volume of the chemical consolidation plugging slurry expands slightly after solidification, with an expansion rate of more than 5%. The plugging slurry expands slightly after filling the crack channel, which is beneficial to improving the sealing and bonding strength between the plugging layer and the crack wall.

[0105] Test Example 3:

[0106] The chemical consolidation plugging slurry in the above Examples 1-9 was poured into a 7-5 mm trapezoidal crack mold (length 20 cm), and the sealed mold was placed at 80°C for aging for 12 h, 24 h and 48 h; with the help of a CDL-Ⅱ high temperature and high pressure plugging instrument, the pressure bearing capacity of the gel plug was tested by forward displacement with clean water, and the pressure bearing capacity σ=P / L, where P is the displacement pressure and L is the crack length. The results are shown in Table 3.

[0107] Table 3

[0108]

[0109]

[0110] It can be seen from Table 3 that under this temperature condition, the chemical consolidation plugging slurry can effectively seal the 7-5 mm trapezoidal cracks, indicating that a higher bonding strength can be formed between the chemical consolidation plugging slurry and the rock interface, and the pressure bearing capacity is higher.

[0111] Test example 4:

[0112] The chemical consolidation plugging slurry after consolidation was dried and crushed, then passed through a 6-10 mesh sieve, 2.0 g of particles were taken and placed in a test tube, the particle accumulation volume was 12 mL, and 12 mL of 15 wt% hydrochloric acid was added. After 5 minutes, all the consolidations formed by the plugging slurry in Example 1-9 were dissolved, indicating that the chemical consolidation plugging product has good acid solubility, which is beneficial to the unblocking of the reservoir.

[0113] It can be seen from the above embodiments that the plugging agent of the present invention is prepared with a variety of inorganic materials and organic materials, has high hydration activity, can be directly added to drilling fluid to form plugging slurry, can enter leakage channels of various sizes, has good adaptability, and has good retention capacity. After entering the formation, it gradually gels and solidifies, produces micro-expansion, can effectively block the leakage channel, has good sealing, and improves the pressure bearing capacity of the leakage formation, and has high strength; the plugging slurry has an appropriate hardness after solidification, and after the plugging is successful, a smaller drilling pressure can be used to complete the well clearing operation without forming new holes, and the plugging agent is acid-soluble, which is helpful for unblocking after plugging; the plugging agent has a simple preparation process, is easy to use, has a low cost, and has a wide range of applications.

[0114] The applicant declares that the present invention uses the above embodiments to illustrate the detailed products and methods of the present invention, but the present invention is not limited to the above detailed products and methods, that is, it does not mean that the present invention must rely on the above detailed products and methods to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A chemical consolidation plugging agent, characterized in that: The chemical consolidation plugging agent comprises the following raw material components by weight:

2. The chemical consolidation plugging agent according to claim 1, characterized in that: The active oxides include light-burned active oxides; Preferably, the active oxide includes any one of aluminum oxide, calcium oxide or silicon dioxide, or a combination of at least two of them.

3. The chemical consolidation plugging agent according to claim 1 or 2, characterized in that: The sulfate includes anhydrous sulfate; Preferably, the sulfate includes any one of anhydrous calcium sulfate, anhydrous sodium sulfate or anhydrous potassium sulfate, or a combination of at least two thereof.

4. The chemical consolidation plugging agent according to any one of claims 1 to 3, characterized in that: The pH adjuster includes any one of sodium citrate, sodium dihydrogen phosphate or citric acid, or a combination of at least two thereof; Preferably, the water reducer includes any one of a polycarboxylic acid water reducer, a naphthalene water reducer or a wood calcium water reducer, or a combination of at least two thereof.

5. The chemical consolidation plugging agent according to any one of claims 1 to 4, characterized in that: The coagulant comprises any one of calcium chloride, sodium methylene dinaphthalene sulfonate or dibutyl phthalate or a combination of at least two thereof; Preferably, the mineral admixture comprises any one or a combination of at least two of slag powder, silica powder, limestone or kaolin; Preferably, the organic polymer comprises any one of polyanionic cellulose, sodium carboxymethyl cellulose or hydroxyethyl cellulose, or a combination of at least two thereof.

6. The method for preparing the chemical consolidation plugging agent according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: The raw material components of the chemical consolidation plugging agent are stirred and mixed according to weight parts, dried and then ball-milled to obtain a chemical consolidation plugging agent product.

7. The preparation method according to claim 6, characterized in that: The stirring and mixing temperature is 45-55°C and the pressure is normal pressure; Preferably, the stirring and mixing is carried out in a kneader.

8. The preparation method according to claim 6 or 7, characterized in that: The stirring rate during the stirring and mixing is 100 to 200 r / min; Preferably, the stirring and mixing time is 3 to 6 hours.

9. The preparation method according to any one of claims 6 to 8, characterized in that: The drying is carried out in a drying oven; Preferably, the drying temperature is 80-100°C; Preferably, the drying time is 4 to 6 hours.

10. The preparation method according to any one of claims 6 to 8, characterized in that: The ball milling is carried out using a ball mill; Preferably, the ball milling is dry ball milling; Preferably, the ball milling time is 0.5 to 1 h; Preferably, the particle size of the product after ball milling is greater than 325 meshes.

Images