A solidified plugging slurry based on oil-based drill cuttings

Abstract

The present invention provides a solidified plugging slurry based on oil-based drill cuttings, comprising component A and component B in a weight ratio of 1: (0.2-0.6); wherein component A comprises urea-formaldehyde resin, curing agent solution, filler, modifier solution, and water; component B comprises oil-based drill cuttings and base oil; after component A and component B are mixed, the solidified plugging slurry can effectively stay in the cracks by utilizing the good compatibility and adaptability of the oil-based drill cuttings with the formation, and a solidification reaction occurs under the action of the formation temperature to form a high-strength consolidated plugging layer, which bonds the plugging agent such as drill cuttings, the cracks and the well wall as a whole, and can significantly improve the bearing capacity of the formation while quickly plugging. The solidified plugging slurry based on oil-based drill cuttings provided by the present invention is adapted to the formation temperature of 60-120°C, the curing time is controllable at 120-480min, the 24h consolidation strength is greater than 15.0MPa, and the operation process is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling plugging, and in particular relates to a solidified plugging slurry based on oil-based drill cuttings, specifically a solidified plugging slurry used in the process of oil or natural gas drilling. Background Art

[0002] With the continuous deepening of shale gas exploration and development, oil-based drilling fluids are widely used for drilling. The leakage of oil-based drilling fluids in complex formations has become increasingly prominent, and the efficiency of well leakage treatment is low, resulting in a significant increase in drilling costs. In response to the problem of oil-based drilling fluid leakage, more than 90% of them are mainly plugged with bridge plugs, and conventional plugging materials are limited in types such as calcium carbonate particles, walnut shells, cotton fibers, asphalt powder, and hydrophilic drilling plugging agents. Due to the strong permeability of oil-based drilling fluids, conventional plugging materials have poor compatibility with oil-based drilling fluids, and cannot form a sealing plugging layer in the cracks, which is prone to repeated leakage and has a low plugging success rate. Summary of the invention

[0003] In view of this, an object of an embodiment of the present invention is to provide a solidified plugging slurry based on oil-based drill cuttings. The solidified plugging slurry of oil-based drill cuttings provided by the present invention has good performance.

[0004] The present invention provides a solidified plugging slurry based on oil-based drill cuttings, comprising: component A and component B;

[0005] The component A comprises: urea-formaldehyde resin, curing agent solution, modifier solution, filler and water;

[0006] The B component includes: oil-based drill cuttings and base oil.

[0007] Preferably, the mass ratio of component A to component B is 1:(0.2-0.6).

[0008] Preferably, the ingredients of component A are:

[0009]

[0010] Preferably, the B component comprises, by weight:

[0011] 30-50 parts of oil-based drill cuttings,

[0012] 50-70 parts of base oil.

[0013] Preferably, the urea-formaldehyde resin has a solid content of 60-65% and a pH value of 9.0-10.0.

[0014] Preferably, the curing agent in the curing agent solution is selected from at least one of ammonium chloride, ammonium sulfate, ammonium persulfate, diammonium hydrogen phosphate, and hydrogen peroxide;

[0015] The mass concentration of the curing agent solution is 5-15%.

[0016] Preferably, the modifier in the modifier solution is selected from at least one of triethanolamine, diethanolamine, phthalic acid, ammonia water, urea, and oxalic acid;

[0017] The mass concentration of the modifier solution is 2.5-8%.

[0018] Preferably, the filler is selected from at least one of wood powder, flour, iron oxide, styrene-butadiene rubber and bentonite.

[0019] Preferably, the base oil is selected from diesel and / or white oil.

[0020] Preferably, the particle size of the filler is 80 to 200 mesh;

[0021] The particle size of the oil-based drill cuttings is less than 2 mm.

[0022] There are some existing methods for treating oil-based drill cuttings, such as incineration technology, high-temperature cracking technology, biological treatment technology, spin-drying separation technology, etc., which have the problems of high treatment cost, long treatment cycle, large floor space, etc. In addition, oil-based drill cuttings contain volatile components and toxic complex components such as benzene series, phenolic compounds, heavy metal ions, etc., and combustion treatment will cause secondary pollution. The present invention provides a solidified plugging slurry based on the resource utilization of oil-based drill cuttings and a preparation method. The present invention utilizes the adaptability of oil-based drill cuttings to formation physical properties, the compatibility of oil-based drilling fluids, and the particle size distribution of oil-based drill cuttings. The oil-based drill cuttings and urea-formaldehyde resin are used as the main plugging materials to form a solidified plugging formula with good matching with the leaking layer, high compressive strength, and stable and durable plugging layer.

[0023] The solidified plugging slurry provided by the present invention is adapted to a formation temperature of 60 to 120° C., has a controllable solidification time of 120 to 480 minutes, a 24-hour consolidation strength greater than 15 MPa, and a high one-time plugging success rate. It can form a dense seal in cracks or microcracks, save plugging materials, reduce the environmental protection treatment cost of oil-based drill cuttings, alleviate the environmental protection pressure of oil-based drill cuttings treatment, and realize the harmless and resourceful utilization of oil-based drill cuttings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a picture of the crack plugging device used in the crack experiment of the present invention;

[0025] Figure 2 This is a picture of the crack module used in the crack experiment of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The invention provides a solidified plugging slurry based on oil-based drill cuttings, comprising: an A component and a B component.

[0028] In the present invention, the component A comprises: urea-formaldehyde resin, curing agent solution, modifier solution, filler and water.

[0029] In the present invention, the B component includes: oil-based drill cuttings and base oil.

[0030] In the present invention, the mass ratio of the component A to the component B is preferably 1:(0.2-0.6), more preferably 1:(0.2-0.5), and most preferably 1:(0.3-0.4).

[0031] In the present invention, component A is a curing system for curing plugging slurry, and the present invention adopts a urea-formaldehyde resin curing system. Component B is a suspension of oil-based drill cuttings. Since the oil-based drill cuttings returned from the centrifuge and the vibrating screen contain more oil-based drilling fluid and the drill cuttings have a large viscosity, the base oil is used to fully dilute the oil-based drill cuttings.

[0032] In the present invention, the components of component A are preferably:

[0033]

[0034] In the present invention, the mass content of the urea-formaldehyde resin in component A is preferably 55-80%, more preferably 60-80%, and more preferably 70%.

[0035] In the present invention, the mass content of the curing agent solution in component A is preferably 1-4%, more preferably 2-4%, and more preferably 3%.

[0036] In the present invention, the mass content of the modifier solution in component A is preferably 0.5-3%, more preferably 1-3%, more preferably 1.5-2.5%, and most preferably 2%.

[0037] In the present invention, the mass content of the filler in component A is preferably 4-7.5%, more preferably 4-7%, and more preferably 5-6%.

[0038] In the present invention, the urea-formaldehyde resin is preferably a resin obtained by condensation reaction of urea and formaldehyde, which complies with the provisions of GB / T14732; the solid content (mass fraction) of the urea-formaldehyde resin is preferably 60-65%, more preferably 61-64%, most preferably 62-63%; the pH value of the urea-formaldehyde resin is preferably 9.0-10.0, more preferably 9.5.

[0039] In the present invention, the urea-formaldehyde resin is in a liquid state and can be a commercially available product.

[0040] In the present invention, the curing agent in the curing agent solution is preferably selected from at least one of ammonium chloride, ammonium sulfate, ammonium persulfate, diammonium phosphate, and hydrogen peroxide, and more preferably selected from at least one of ammonium chloride, ammonium sulfate, and diammonium phosphate. In the present invention, the mass concentration of the curing agent solution is preferably 5-15%, more preferably 5.5-12%, more preferably 6-10%, more preferably 7-9%, and most preferably 8%.

[0041] In the present invention, the modifier can not only change the curing time, but also improve the water resistance, strength and durability of the cured product. In the present invention, the modifier in the modifier solution is preferably selected from at least one of triethanolamine, diethanolamine, phthalic acid, ammonia, urea, and oxalic acid, and more preferably selected from at least one of triethanolamine, urea and diethanolamine. In the present invention, the mass concentration of the modifier solution is preferably 2.5-8%, more preferably 3-8%, more preferably 4-7.5%, more preferably 5-7%, and most preferably 6%.

[0042] In the present invention, the filler can reduce the volume shrinkage of the solidified plugging slurry during solidification and avoid cracking, and can also improve the water resistance of the product. In the present invention, the filler is preferably selected from at least one of wood powder, flour, iron oxide, styrene-butadiene rubber, and bentonite, and more preferably selected from at least one of wood powder, flour, and bentonite. In the present invention, the particle size of the filler is preferably 80 to 200 mesh, more preferably 100 to 200 mesh, more preferably 120 to 180 mesh, and most preferably 140 to 160 mesh.

[0043] In the present invention, the preparation method of component A preferably comprises:

[0044] mixing urea-formaldehyde resin, filler and water to obtain a mixture;

[0045] The mixture is mixed with a curing agent solution and a modifier solution to obtain component A.

[0046] In the present invention, the mixing is preferably carried out in a reactor; the mixing is preferably carried out by stirring evenly.

[0047] In the present invention, the B component preferably comprises, by weight:

[0048] 30-50 parts of oil-based drill cuttings,

[0049] 50-70 parts of base oil.

[0050] In the present invention, the weight proportion of the oil-based drill cuttings is preferably 35 to 45 parts, more preferably 40 parts.

[0051] In the present invention, the weight percentage of the base oil is preferably 55 to 65 parts, more preferably 60 parts.

[0052] In the present invention, the B component is formed by mixing oil-based drill cuttings and base oil.

[0053] In the present invention, the oil-based drill cuttings are drill cuttings returned from the centrifuge and the integrated machine during the drilling process, and have not been processed by complex procedures such as re-crushing and screening, and do not need to be specially processed. In the present invention, the particle size of the oil-based drill cuttings is preferably less than 2 mm to ensure that the slurry is evenly dispersed, has good fluidity, and has consistent upper and lower consolidation strengths and high consolidation strengths; oil-based drill cuttings with too large a particle size settle and accumulate, resulting in uneven distribution of the solidified plugging slurry, bottom consolidation and low strength, affecting the plugging effect.

[0054] In the present invention, the base oil is preferably selected from diesel and / or white oil, which has a wide range of applications; the white oil can be selected from 3 # White oil and / or 5 # In the present invention, the base oil is preferably selected from 0 # Diesel or 5 # White oil.

[0055] In the present invention, the preparation method of the B component preferably comprises:

[0056] The base oil and oil-based drill cuttings are mixed to obtain the B component.

[0057] In the present invention, the mixing is preferably carried out in a reaction container; the mixing is preferably carried out by stirring evenly.

[0058] In the present invention, the method for preparing the solidified plugging slurry based on oil-based drill cuttings preferably comprises:

[0059] The components A and B are mixed to obtain a solidified plugging slurry based on oil-based drill cuttings.

[0060] In the present invention, the mixing is preferably adding component B to component A and stirring evenly.

[0061] In the present invention, the method for preparing the solidified plugging slurry based on oil-based drill cuttings preferably comprises:

[0062] The urea-formaldehyde resin, curing agent solution, filler, modifier solution and water are mixed evenly by a mixing device to obtain component A; the oil-based drill cuttings and base oil are mixed evenly by a mixing device to obtain component B; the component B is added to the component A to obtain a solidified plugging slurry based on the oil-based drill cuttings; the weight ratio of the component A to the component B is 1: (0.2-0.6).

[0063] The present invention has no particular limitation on the mixing device, and any mixing device well known to those skilled in the art may be used.

[0064] In the present invention, the solidified plugging slurry based on oil-based drill cuttings is preferably adapted to a formation temperature of 60-120°C, more preferably 65-110°C, more preferably 70-100°C, and most preferably 80-90°C.

[0065] Oil-based drilling fluid is used for drilling, which produces a large amount of oil-based cuttings. The average cuttings per well is 200-250m 3 , the oil content of oil-based drill cuttings is as high as 15% to 25%, and it also contains toxic substances such as heavy metal ions, benzene series, phenolic compounds, etc., which belong to hazardous wastes (National Hazardous Waste Catalog, HW08), which may cause harm to the local ecological environment and human health during the production, stacking, transportation and treatment process. At present, there are many studies on the treatment of oil-based drill cuttings, such as high-temperature thermal analysis, LRET extraction, biological treatment and other technologies, which have complex treatment processes, high difficulty, high treatment costs, less harmless treatment and resource utilization of on-site oil-based drill cuttings or high costs, and are not suitable for on-site promotion. The present invention uses a solidified plugging formula based on oil-based drill cuttings for plugging applications, with high plugging efficiency, and can form a dense plugging in cracks or microcracks, which not only saves plugging materials and solves the problem of oil-based drilling fluid leakage, but also reduces the treatment cost of oil-based drill cuttings, reduces the environmental protection pressure of oil-based drill cuttings, and achieves the purpose of harmless, resource utilization, and economical utilization of oil-based drill cuttings.

[0066] The formula of the solidified plugging slurry provided by the present invention is adapted to a formation temperature of 60 to 120° C., and the solidification time is controllable at 120 to 480 minutes. The solidified product has high strength and durability, and can form a dense seal in cracks or microcracks, thereby avoiding repeated plugging of the same leaking layer, saving plugging materials, reducing the environmental protection treatment cost of oil-based drill cuttings, alleviating the environmental protection pressure of oil-based drill cuttings treatment, and realizing the harmless and resourceful utilization of oil-based drill cuttings.

[0067] The following embodiments of the present invention use # Diesel, 3 # White oil and 5 #All white oils are industrial products produced by Sinopec; the particle size of oil-based drill cuttings is less than 2.0 mm and is taken from Jiaoye 143-HF well; the industrial product mass fraction of urea-formaldehyde resin is 60% to 65% and is purchased from Dongguan Minglang Plastic Raw Materials Co., Ltd.; ammonium chloride, ammonium sulfate, ammonium persulfate and oxalic acid are all industrial products provided by Luantai Chemical Raw Materials Co., Ltd.; triethanolamine is an industrial product purchased from Zibo Levo Chemical Co., Ltd.; wood powder is provided by Lingshou County Tianlong Mineral Products Processing Plant, and bentonite is provided by Weifang City Fangzi District Xinglong Bentonite Plant.

[0068] Example 1

[0069] In parts by weight, 50 parts of 65% urea-formaldehyde resin with a pH of 9.5, 3.5 parts of wood powder with a particle size of 90 mesh, and 43.5 parts of water were added to the reactor and stirred evenly. Then, 1.0 parts of 5% ammonium chloride solution and 2.0 parts of 5% triethanolamine solution were added and stirred evenly to obtain component A. 60 parts of 0 # Diesel oil and 40 parts of oil-based drill cuttings are stirred evenly to obtain component B; 20 parts of the above component B are added to the above component A, and stirred evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0070] Example 2

[0071] In parts by weight, 80 parts of 60% urea-formaldehyde resin with a pH of 10.0, 5.0 parts of 100-mesh bentonite, and 12 parts of water were added to the reactor and stirred evenly. Then, 2.0 parts of 6.0% ammonium sulfate solution and 1.0 parts of 7.5% triethanolamine solution were added and stirred evenly to obtain component A. 65 parts of 3 # White oil and 35 parts of oil-based drill cuttings are stirred evenly to obtain component B; 30 parts of the above component B are added to the above component A, and stirred evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0072] Example 3

[0073] In parts by weight, 60 parts of 65% urea-formaldehyde resin with a pH of 9.5, 8.0 parts of bentonite with a particle size of 150 mesh, and 28.5 parts of water were added to the reactor and stirred evenly. Then, 3.0 parts of 5% hydrogen peroxide solution and 0.5 parts of 10% ammonia solution were added and stirred evenly to obtain component A. 70 parts of 0 # Diesel oil and 30 parts of oil-based drill cuttings are mixed evenly to obtain component B; 40 parts of the above component B are added to the above component A, and mixed evenly to obtain urea-formaldehyde resin solidified slurry.

[0074] Example 4

[0075] In parts by weight, 80 parts of 60% urea-formaldehyde resin with a pH of 10.0, 5.0 parts of wood powder with a particle size of 100 mesh, and 12 parts of water were added to the reactor and stirred evenly. Then, 2.0 parts of 6% ammonium sulfate solution and 1.0 parts of 7.5% triethanolamine solution were added and stirred evenly to obtain component A. 65 parts of 3 # White oil and 35 parts of oil-based drill cuttings are stirred evenly to obtain component B; 40 parts of the above component B are added to the above component A, stirred evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0076] Example 5

[0077] In parts by weight, 65 parts of urea-formaldehyde resin with a mass fraction of 65% and a pH of 9.5, 6.0 parts of bentonite with a particle size of 180 mesh, and 24.5 parts of water were added to the reactor and stirred evenly. Then, 4.0 parts of ammonium persulfate solution with a mass fraction of 8% and 0.5 parts of oxalic acid solution with a mass fraction of 5.0% were added and stirred evenly to obtain component A. 60 parts of 5% # White oil and 40 parts of oil-based drill cuttings are stirred evenly to obtain component B; 25 parts of the above component B are added to the above component A, and stirred evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0078] Comparative Example 1

[0079] Add 80 parts of 60% urea-formaldehyde resin with a pH of 10.0, 5.0 parts of wood powder with a particle size of 100 mesh, and 12 parts of water to the reactor, stir evenly, then add 2.5 parts of 5% ammonium sulfate solution and 1.0 part of 7.5% triethanolamine solution, stir evenly to obtain component A; add 65 parts of 3 # white oil, stir evenly to obtain component B; take 40 parts of the above component B and add it to the above component A, stir evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0080] Comparative Example 2

[0081] Add 65 parts of urea-formaldehyde resin with a mass fraction of 65% and a pH of 9.5, 6.0 parts of bentonite with a particle size of 180 mesh, and 24.5 parts of water to the reactor, stir evenly, then add 3.0 parts of ammonium persulfate solution with a mass fraction of 7% and 0.5 parts of oxalic acid solution with a mass fraction of 5.0%, stir evenly, and obtain component A; add 60 parts of 5 # White oil and 40 parts of walnut shells are stirred evenly to obtain component B; 25 parts of the above component B are added to the above component A, and stirred evenly to obtain urea-formaldehyde resin cured plugging slurry.

[0082] Performance Testing

[0083] In order to ensure safety during construction and prevent the solidified plugging slurry from thickening and failing to flow before reaching the target layer, the thickening time of the plugging liquid was evaluated. The thickening time determination method was carried out in accordance with the oil well cement application performance test method SY / T5546. The test results are as follows. It can be seen that the solidified plugging slurry prepared by the present invention is adaptable to the formation temperature between 60 and 120°C and the thickening time is controllable between 120 and 480 minutes. Through comparative experiments, the addition of oil-based drill cuttings basically does not affect the thickening time of the plugging slurry.

[0084]

[0085] In order to improve the adaptability of the consolidation slurry to the leaking layer and enable it to effectively stay and consolidate in the leaking layer, the crack retention performance of the solidified plugging slurry based on oil-based drill cuttings prepared in the embodiment of the present invention was evaluated; a crack experiment was carried out, the crack width was 2mm, the crack length was 15cm, and the detection equipment was as follows Figure 1 and Figure 2 As shown, the experimental method is as follows:

[0086] Select a 2mm crack module, assemble it and place it in the simulated wellbore, install the simulated wellbore bottom cover to fix the crack module, and close the valve on the bottom cover at the same time; pour the prepared plugging liquid into the simulated wellbore, cover the simulated wellbore top cover, connect the pressure pipeline to the simulated wellbore top cover, and check that the pressure pipeline is tightly connected; turn on the high-pressure displacement pump, and when the pressure rises to 0.5MPa, open the valve on the simulated wellbore bottom cover, observe the plugging situation, and record the pressure; after the experiment, take out the crack module, observe and record the resident plugging state of the plugging material in the crack; clean the simulated wellbore and the crack module, and restore them to the initial state of the experiment. The test results are as follows:

[0087]

[0088]

[0089] It can be seen that the solidified plugging slurry prepared by the present invention improves the retention of the consolidation slurry due to the presence of oil-based drill cuttings. The retention length of 8cm to 12cm provides a good barrier for the consolidation slurry to consolidate at the effective position of the leaking layer. The plugging strength is 5.5MPa, and the 24h consolidation strength is greater than 15MPa. Due to the introduction of oil-based drill cuttings with a particle size of less than 2.0mm, the slurry is evenly distributed, has good fluidity, consistent upper and lower consolidation strengths, increased consolidation strength, and improved plugging efficiency. The solidified plugging slurry prepared in the comparative example has a retention length of 3 to 5cm, a plugging strength of no more than 3.0MPa, and a 24h consolidation strength of more than 15MPa. Through comparative experiments, after adding oil-based drill cuttings, the plugging slurry can stay faster and have a high plugging strength, and basically does not affect the consolidation strength.

[0090] The present invention provides a solidified plugging slurry based on oil-based drill cuttings and a preparation method thereof, wherein the solidified plugging slurry comprises a component A and a component B in a weight ratio of 1: (0.2-0.6); wherein the component A comprises: urea-formaldehyde resin, a curing agent, a filler, a modifier, and water; the component B comprises oil-based drill cuttings and a base oil; after the components A and B are mixed, a solidification reaction occurs in the formation, and the generated solidified plugging slurry quickly plugs the cracks in the formation. The plugging liquid provided by the present invention is adapted to a formation temperature of 60-120°C, the curing time is controllable at 120-480min, the 24h consolidation strength is greater than 15.0MPa, and the operation process is simple. In the present invention, the particle size of the oil-based drill cuttings is less than 2mm, and the drill cuttings are directly returned from the centrifuge and the integrated machine during the drilling process, and no special treatment is required, so that the oil-based drill cuttings are obtained locally, the plugging materials are saved, the environmental protection treatment cost of the oil-based drill cuttings is reduced, and the environmental protection pressure of the oil-based drill cuttings treatment is reduced, and the harmless and resource utilization of the oil-based drill cuttings is realized, which is of great significance.

[0091] The present invention provides a solidified plugging slurry for resource utilization of oil-based drill cuttings, which has the advantages of good matching with the leaking layer, strong plugging ability, high compressive strength, stable and durable plugging layer, etc. It can form a dense plugging in cracks or microcracks, save plugging materials, reduce the environmental protection treatment cost of oil-based drill cuttings, alleviate the environmental protection pressure of oil-based drill cuttings treatment, and realize the harmless and resource utilization of oil-based drill cuttings.

[0092] Although the present invention has been described and illustrated with reference to specific embodiments of the present invention, these descriptions and illustrations do not limit the present invention. It will be clearly understood by those skilled in the art that various changes may be made without departing from the true spirit and scope of the present invention as defined by the appended claims, so that specific circumstances, materials, material compositions, materials, methods or processes are suitable for the goals, spirit and scope of the present application. All such modifications are intended to be within the scope of the appended claims. Although the methods disclosed herein have been described with reference to specific operations performed in a specific order, it should be understood that these operations may be combined, subdivided or reordered to form equivalent methods without departing from the teachings of the present invention. Therefore, unless specifically indicated herein, the order and grouping of operations are not limitations of the present application.

Claims

1. A solidified plugging slurry based on oil-based drill cuttings, comprising: A component and B component; The component A comprises: urea-formaldehyde resin, curing agent solution, modifier solution, filler and water; The B component includes: oil-based drill cuttings and base oil; The ingredients of the A component are: Urea-formaldehyde resin 50-90wt%; Curing agent solution 1.0~5.0wt%; Modifier solution 0.5-3.5wt%; Filler 3.0-8.0wt%; The balance is water; The curing agent in the curing agent solution is selected from at least one of ammonium chloride, ammonium sulfate, ammonium persulfate, diammonium hydrogen phosphate, and hydrogen peroxide, and the mass concentration of the curing agent solution is 5-15%; The modifier in the modifier solution is selected from at least one of triethanolamine, diethanolamine, phthalic acid, ammonia, urea, and oxalic acid; the mass concentration of the modifier solution is 2.5-8%; The filler is selected from at least one of wood powder, flour, iron oxide, styrene-butadiene rubber and bentonite; The B component comprises, by weight: 30-50 parts of oil-based drill cuttings, 50-70 parts of base oil.

2. The solidified plugging slurry based on oil-based drill cuttings according to claim 1, characterized in that: The mass ratio of the component A to the component B is 1:(0.2-0.6).

3. The solidified plugging slurry based on oil-based drill cuttings according to claim 1, characterized in that: The solid content of the urea-formaldehyde resin is 60-65%, and the pH value is 9.0-10.

0.

4. The solidified plugging slurry based on oil-based drill cuttings according to claim 1, characterized in that: The base oil is selected from diesel and / or white oil.

5. The solidified plugging slurry based on oil-based drill cuttings according to claim 1, characterized in that: The particle size of the filler is 80-200 meshes.

6. The solidified plugging slurry based on oil-based drill cuttings according to claim 5, characterized in that: The particle size of the oil-based drill cuttings is less than 2 mm.

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