Internal catalytic type rapid reaction water-based sand consolidation agent as well as preparation method and application thereof

Abstract

The invention discloses an internal catalytic type rapid reaction water-based sand consolidation agent which is composed of the following components: 10%-15% of glycidyl ether, 0.5%-1% of a miscible phase agent, 0.4%-1% of a rapid curing agent and the balance of water. The invention discloses a preparation method of an internal catalytic rapid reaction water-based sand consolidation agent. The preparation method comprises the following specific steps: (1) preparing a rapid curing agent; and (2) uniformly mixing the glycidyl ether with the formula ratio, the miscible phase agent with the formula ratio, the rapid curing agent with the formula ratio and the water with the formula ratio at room temperature to obtain the internal catalytic rapid reaction water-based sand consolidation agent. The invention further discloses application of the internal catalytic type rapid reaction water-based sand consolidation agent to rapid sand consolidation of a sand prevention well of a loose sandstone reservoir. The method has the following beneficial effects: 1, the problem of non-uniform injection of a multi-stage slug system is effectively avoided; 2, the system is relatively high in safety, environmental protection property and stability; and 3, the setting waiting time is greatly shortened, and the operation cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development, and belongs to the field of chemical sand control technology. Specifically, it relates to an internally catalytic, fast-reacting water-based sand-fixing agent, its preparation method, and its application. Background Technology

[0002] Chemical sand control is highly adaptable to complex well conditions and has significant advantages in small-diameter wells, wells with casing damage and deformation, and sidetracking wells. However, it also has disadvantages such as low success rate and short effective period.

[0003] The uniformity of sand control agent injection significantly affects the effectiveness of chemical sand control measures. Reservoir heterogeneity and non-uniform contact in multi-stage injection systems often create cementation weak points, leading to "sand production at one point, failure of the entire well".

[0004] Conventional resin-based sand-fixing agents have the following drawbacks: First, the curing agent component is injected as an external catalyst, and the difference in viscosity and density between the injected fluids causes uneven contact and consolidation of the sand-fixing agent, displacement fluid, or catalyst, greatly shortening the effective period of the measure; Second, the types of curing agents are generally volatile ethylenediamine, corrosive strong acids, or easily decomposable ammonium chloride, which have poor safety and environmental protection; Third, the curing time of conventional chemical sand-fixing systems is 36-72 hours, which is a long waiting time and generally results in high operating costs.

[0005] Water-based sand-fixing agents have low viscosity, are easy to pump in, and have high construction safety, making them a major research direction for chemical sand control sand-fixing systems in recent years.

[0006] Chinese invention patent CN 101538460B discloses a water-based resin sand-fixing agent, comprising the following parts by weight of base material: 5-10 parts of modified urea-formaldehyde resin, 5-10 parts of organic pore-forming agent, and 1 part of emulsifier for every 100 parts of base material. The modified urea-formaldehyde resin, organic pore-forming agent, and emulsifier are mixed and stirred according to the parts by weight to obtain a mixture for later use. Before construction, a curing agent is added to the mixture in proportion, and the curing agent and the mixture are thoroughly mixed to form the finished product.

[0007] Chinese invention patent CN 110117347B discloses a water-based furan resin sand-fixing agent, its preparation method, and the sand-fixing agent. The water-soluble furan resin is prepared through a multi-step reaction of urea, formaldehyde, furfuryl alcohol, and polyethylene oxide. The water-based furan resin sand-fixing agent is prepared by compounding it with one or more composite acids selected from p-toluenesulfonic acid, benzenesulfonic acid, phosphoric acid, and sulfuric acid.

[0008] The above technical solutions have the following shortcomings: 1. Water-based sand-fixing agents need to be mixed with curing agents before use, which increases the cost of separate storage and operation of curing agents; 2. Curing agent components are injected as external catalysts, which can easily cause uneven mixing of the main sand-fixing agent and curing agent, reducing the treatment efficiency; 3. Strong acid curing agents pose a high safety risk during storage and use.

[0009] Chinese invention patent CN 109021951B discloses a sand-fixing agent that does not undergo a self-consolidation reaction, made from the following raw materials in parts by weight: 100 parts epoxy resin, 10-15 parts emulsifier, 0.5-2.0 parts nanoparticles, 200-400 parts of an aqueous solution of acrylic monomer with a mass concentration of 3%-5%, and 5-10 parts curing agent. The curing agent is selected from one or a mixture of two of ethylenediamine and cycloethylenediamine. In this invention, the resin for sand fixing is emulsified in the curing agent aqueous solution, eliminating the need for additional external curing agent. Consolidation is completed after the sand-fixing agent is mixed with quartz sand and heated for 72 hours.

[0010] For example, Chinese invention patent CN 108659805B discloses an emulsion-type low-temperature sand-fixing agent. The raw material components and their weight percentages are as follows: 63-76% cementitious agent, 22-35% oil phase, 0.9%-1.5% emulsion stabilizer, 0.05%-0.5% curing agent, and 0.1%-0.3% coupling agent. The cementitious agent is a 35-55% (w / w) melamine-formaldehyde resin solution, with water as the solvent; the oil phase is kerosene; the emulsion stabilizer is hydrophilic nano-silica particles, which are nano-silica particles surface-treated with a coupling agent or nano-silica particles with added particle dispersant; the curing agent is ammonium chloride. In this invention, the curing agent is dispersed in an aqueous medium as the external phase of the emulsion, eliminating the need for additional external curing agent. Quartz sand solidifies after 36 hours of treatment with the emulsion-type low-temperature sand-fixing agent.

[0011] The above technical solution can use the curing agent as a built-in additive to realize the one-time configuration of the sand-fixing system. However, there are still the following shortcomings: (1) The curing time of the sand-fixing agent is 36-72h, the waiting time is long, and the operating cost is high; (2) Using volatile ethylenediamine or easily decomposable ammonium chloride as curing agent limits the safety, environmental protection and product stability. Summary of the Invention

[0012] The technical problems addressed in this application are: (1) When the curing agent component is injected as an external catalyst tail, it is easy to cause uneven mixing between the main agent of the sand-fixing agent and the curing agent, resulting in reduced processing efficiency; (2) The curing time of the sand-fixing agent is 36-72h, which is a long waiting time and has high operating costs; (3) Using strong acid, volatile ethylenediamine or easily decomposable ammonium chloride as curing agent limits safety, environmental protection and product stability.

[0013] Objective of the Invention: Addressing the technical problems existing in the prior art, this invention discloses an internally catalytically catalytically rapid-reaction water-based sand-fixing agent, its preparation method, and its application. The internally catalytically ...

[0014] Technical solution: An internally catalytic, fast-reacting water-based sand-stabilizing agent, composed of the following components by mass percentage:

[0015] Glycidyl ether 10%-15%, miscibility agent 0.5%-1%, fast curing agent 0.4%-1%, balance is water.

[0016] A method for preparing the above-mentioned internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent includes the following specific steps:

[0017] (1) Preparation of rapid curing agent;

[0018] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0019] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0020] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0021] The sand-stabilizing agent of this invention is a low-viscosity water-based system with a built-in curing agent, with a viscosity of only 4-5 mPa·s, making it easy to pump deep into the filling layer. The curing agent is a long-alkyl chain imidazoline; at room temperature, the hydrophobic alkyl chain coils in the aqueous phase, shielding the active imidazoline groups and preventing premature curing of the system. When the sand-stabilizing agent is pumped into the reservoir, under formation temperature conditions, the active imidazoline groups are exposed, and the epoxy groups in the glycidyl ether undergo ring-opening addition polymerization, resulting in complete curing within 10-12 hours. This results in a short curing time and low operating costs.

[0022] The curing agent used in the internally catalytic rapid-reaction water-based sand-fixing agent disclosed in this invention is alkyl imidazoline, the preparation temperature is 180-200℃, it is not easily volatilized or decomposed at room temperature, and the system has high safety, environmental protection and stability.

[0023] Beneficial Effects: The internally catalytic, fast-reaction water-based sand-stabilizing agent, its preparation method, and its application disclosed in this invention have the following beneficial effects:

[0024] 1. The internally catalytic rapid-reaction water-based sand-fixing agent disclosed in this invention is a low-viscosity water-based system with a built-in curing agent. The internally catalytic rapid-reaction water-based sand-fixing agent can achieve internal catalytic curing of the system, effectively avoiding the problem of uneven injection in multi-stage slug systems.

[0025] 2. The curing agent used in the internally catalytic rapid reaction water-based sand-fixing agent disclosed in this invention is a non-volatile, non-decomposable alkyl imidazoline, and the system has high safety, environmental protection and stability.

[0026] 3. The internally catalytic rapid-reaction water-based sand-fixing agent of the present invention can achieve rapid solidification in 10-12 hours within the reservoir temperature range of 50-80℃, greatly shortening the waiting time and significantly reducing the operating cost. Attached Figure Description

[0027] Figure 1 This is a flowchart of an internally catalytically catalyzed, fast-reacting water-based sand-fixing agent and its preparation method disclosed in this invention. Detailed Implementation

[0028] The specific embodiments of the present invention are described in detail below.

[0029] The "range" disclosed in this invention is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10–50 is listed for a specific parameter, it is also expected that ranges of 10–40 and 20–50 are also included. Furthermore, if the minimum range values ​​are 1 and 2, and the maximum range values ​​are 3, 4, and 5, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0–5" means that all real numbers between "0–5" have been listed herein; "0–5" is merely a shortened representation of these numerical combinations.

[0030] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0031] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0032] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0033] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0034] Unless otherwise specified, the reaction will proceed under normal temperature and pressure conditions.

[0035] Unless otherwise specified, all parts or percentages are by weight or by weight percentage.

[0036] In this invention, all the substances used are known substances that can be purchased or synthesized by known methods.

[0037] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0038] Taking diethylenetriamine as an example, the synthesis route of the internally catalyzed, fast-reaction water-based sand-fixing agent disclosed in this invention is as follows:

[0039]

[0040] Long-chain fatty acids are one or more of lauric acid, oleic acid, and erucic acid.

[0041] An internally catalytic, fast-reacting water-based sand-stabilizing agent, comprising the following components by weight percentage:

[0042] Glycidyl ether 10%-15%, miscibility agent 0.5%-1%, fast curing agent 0.4%-1%, balance is water.

[0043] Furthermore, the glycidyl ether is one or more of diglycidyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, and resorcinol diglycidyl ether.

[0044] Furthermore, the miscible agent is one or more of ethylene glycol monomethyl ether, diethylene glycol methyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

[0045] Furthermore, the rapid curing agent is a long-chain alkyl imidazoline.

[0046] Furthermore, the long-chain alkyl imidazoline is one or more of imidazoline laurate, imidazoline oleate, and imidazoline erucic acid.

[0047] Furthermore, the structural formula of the long-chain alkyl imidazoline is as follows:

[0048] in:

[0049] R is one or more of lauryl alkyl, oleyl alkyl, and erucic acid alkyl.

[0050] A method for preparing the internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent according to any one of the above-mentioned methods, comprising the following specific steps:

[0051] (1) Preparation of rapid curing agent;

[0052] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0053] Further, based on molar mass parts, step (1) includes the following steps:

[0054] (11) Place 1 part of long-chain fatty acid, 1-1.1 parts of polyethylene polyamine and 10-15 parts of organic solvent in a reaction vessel and mix them evenly to obtain a mixture;

[0055] (12) Adjust the temperature of the mixture to 180-200℃, reflux for at least 4 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

[0056] Furthermore, the polyethylene polyamine mentioned in step (11) is one or more of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.

[0057] Furthermore, the organic solvent mentioned in step (11) is one or more of toluene and xylene.

[0058] Furthermore, the long-chain fatty acid mentioned in step (11) is one or more of lauric acid, oleic acid, and erucic acid.

[0059] Further, the post-processing in step (12) consists of rotary evaporation or vacuum evaporation, filtration, and drying in sequence.

[0060] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0061] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0062] Furthermore, the internally catalytic rapid-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

[0063] In one embodiment:

[0064] An internally catalytic, fast-reacting water-based sand-stabilizing agent, comprising the following components by weight percentage:

[0065] 10% glycidyl ether, 0.5% miscible agent, 0.4% rapid curing agent, and the balance is water.

[0066] Furthermore, the glycidyl ether is a diglycidyl ether.

[0067] Furthermore, the miscible agent is ethylene glycol monomethyl ether.

[0068] Furthermore, the rapid curing agent is a long-chain alkyl imidazoline.

[0069] Furthermore, the long-chain alkyl imidazoline is imidazoline laurylate.

[0070] Furthermore, the structural formula of the long-chain alkyl imidazoline is as follows:

[0071] in:

[0072] R stands for lauryl alkyl group.

[0073] A method for preparing the internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent according to any one of the above-mentioned methods, comprising the following specific steps:

[0074] (1) Preparation of rapid curing agent;

[0075] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0076] Further, based on molar mass parts, step (1) includes the following steps:

[0077] (11) Place 1 part of long-chain fatty acid, 1 part of polyethylene polyamine and 10 parts of organic solvent in a reaction vessel and mix them evenly to obtain a mixture;

[0078] (12) Adjust the temperature of the mixture to 180°C, reflux for 6 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

[0079] Furthermore, the polyethylene polyamine mentioned in step (11) is diethylenetriamine.

[0080] Furthermore, the organic solvent mentioned in step (11) is toluene.

[0081] Furthermore, the long-chain fatty acid mentioned in step (11) is lauric acid.

[0082] Further, the post-processing in step (12) consists of rotary evaporation, filtration, and drying in sequence.

[0083] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0084] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0085] Furthermore, the internally catalytic rapid-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

[0086] In another embodiment:

[0087] An internally catalytic, fast-reacting water-based sand-stabilizing agent, comprising the following components by weight percentage:

[0088] 15% glycidyl ether, 1% miscible agent, 1% rapid curing agent, and the balance is water.

[0089] Furthermore, the glycidyl ether is ethylene glycol diglycidyl ether.

[0090] Furthermore, the miscible agent is diethylene glycol methyl ether.

[0091] Furthermore, the rapid curing agent is a long-chain alkyl imidazoline.

[0092] Furthermore, the long-chain alkyl imidazoline is oleic acid imidazoline.

[0093] Furthermore, the structural formula of the long-chain alkyl imidazoline is as follows:

[0094] in:

[0095] R is an oleic acid alkyl group.

[0096] A method for preparing the internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent according to any one of the above-mentioned methods, comprising the following specific steps:

[0097] (1) Preparation of rapid curing agent;

[0098] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0099] Further, based on molar mass parts, step (1) includes the following steps:

[0100] (11) Place 1 part of long-chain fatty acid, 1.1 parts of polyethylene polyamine and 15 parts of organic solvent in a reaction vessel and mix them evenly to obtain a mixture;

[0101] (12) Adjust the temperature of the mixture to 200°C, reflux for 4 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

[0102] Furthermore, the polyethylene polyamine mentioned in step (11) is triethylenetetramine.

[0103] Furthermore, the organic solvent mentioned in step (11) is xylene.

[0104] Furthermore, the long-chain fatty acid mentioned in step (11) is oleic acid.

[0105] Further, the post-processing described in step (12) consists of vacuum evaporation, filtration, and drying in sequence.

[0106] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0107] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0108] Furthermore, the internally catalytic rapid-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

[0109] In yet another embodiment:

[0110] An internally catalytic, fast-reacting water-based sand-stabilizing agent, comprising the following components by weight percentage:

[0111] 12% glycidyl ether, 0.8% miscible agent, 0.8% rapid curing agent, and the balance is water.

[0112] Furthermore, the glycidyl ether is 1,4-butanediol diglycidyl ether.

[0113] Furthermore, the miscibility agent is triethylene glycol dimethyl ether.

[0114] Furthermore, the rapid curing agent is a long-chain alkyl imidazoline.

[0115] Furthermore, the long-chain alkyl imidazoline is erucic acid imidazoline.

[0116] Furthermore, the structural formula of the long-chain alkyl imidazoline is as follows:

[0117] in:

[0118] R is an erucic acid alkyl group.

[0119] A method for preparing the internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent according to any one of the above-mentioned methods, comprising the following specific steps:

[0120] (1) Preparation of rapid curing agent;

[0121] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0122] Further, based on molar mass parts, step (1) includes the following steps:

[0123] (11) Place 1 part of long-chain fatty acid, 1-1.05 parts of polyethylene polyamine and 12 parts of organic solvent in a reaction vessel, mix them evenly to obtain a mixture;

[0124] (12) Adjust the temperature of the mixture to 190°C, reflux for 5 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

[0125] Furthermore, the polyethylene polyamine mentioned in step (11) is tetraethylenepentamine.

[0126] Furthermore, the organic solvent mentioned in step (11) is a mixture of toluene and xylene with a mass ratio of 1:2.

[0127] Furthermore, the long-chain fatty acid mentioned in step (11) is erucic acid.

[0128] Further, the post-processing in step (12) consists of rotary evaporation, filtration, and drying in sequence.

[0129] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0130] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0131] Furthermore, the internally catalytic rapid-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

[0132] In yet another embodiment:

[0133] An internally catalytic, fast-reacting water-based sand-stabilizing agent, comprising the following components by weight percentage:

[0134] 14% glycidyl ether, 0.9% miscible agent, 0.8% rapid curing agent, and the balance is water.

[0135] Further, the glycidyl ether is resorcinol diglycidyl ether. In another embodiment, the glycidyl ether is a mixture of diglycidyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, and resorcinol diglycidyl ether in equal mass ratios.

[0136] Further, the miscible agent is tetraethylene glycol dimethyl ether. In another embodiment, the miscible agent is a mixture of equal volumes of ethylene glycol monomethyl ether, diethylene glycol methyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

[0137] Furthermore, the rapid curing agent is a long-chain alkyl imidazoline.

[0138] Furthermore, the long-chain alkyl imidazoline is a mixture of imidazoline laurate, imidazoline oleate, and imidazoline erucic acid in equal mass ratios.

[0139] Furthermore, the structural formula of the long-chain alkyl imidazoline is as follows:

[0140] in:

[0141] R is a lauric, oleic, or erucic acid alkyl group.

[0142] A method for preparing the internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent according to any one of the above-mentioned methods, comprising the following specific steps:

[0143] (1) Preparation of rapid curing agent;

[0144] (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0145] Further, based on molar mass parts, step (1) includes the following steps:

[0146] (11) Place 1 part of long-chain fatty acid, 1-1.08 parts of polyethylene polyamine and 14 parts of organic solvent in a reaction vessel and mix them evenly to obtain a mixture;

[0147] (12) Adjust the temperature of the mixture to 195°C, reflux for 4.5 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

[0148] Furthermore, the polyethylene polyamine mentioned in step (11) is a mixture of diethylenetriamine, triethylenetetramine and tetraethylenepentamine in equal mass ratios.

[0149] Furthermore, the organic solvent mentioned in step (11) is toluene and xylene in equal mass ratio.

[0150] Furthermore, the long-chain fatty acid mentioned in step (11) is a mixture of lauric acid, oleic acid and erucic acid in equal mass ratios.

[0151] Further, the post-processing described in step (12) consists of vacuum evaporation, filtration, and drying in sequence.

[0152] An internally catalytic, fast-reacting water-based sand-fixing agent is prepared by any one of the preparation methods described above.

[0153] The above-mentioned internally catalytic rapid-reaction water-based sand-fixing agent is used for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

[0154] Furthermore, the internally catalytic rapid-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

[0155] Example 1

[0156] A method for preparing an internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent, comprising the following steps:

[0157] (1) Preparation of rapid curing agent: A rapid curing agent is obtained by polycondensation reaction using lauric acid, diethylenetriamine, and xylene as raw materials. The specific preparation steps include:

[0158] (11) Take 0.1 mol lauric acid, 0.1 mol diethylenetriamine and 1 mol xylene and place them in a reaction vessel (such as a three-necked flask), mix them evenly to obtain a mixture;

[0159] (12) The mixture is slowly heated to 180°C and kept at that temperature for 6 hours. After vacuum distillation, filtration and drying, a fast curing agent is obtained.

[0160] (2) Preparation of internally catalytic rapid-reaction water-based sand-stabilizing agent:

[0161] Based on the total mass of the internally catalytic fast-reaction water-based sand-fixing agent, 15% of diglycidyl ether, 1% of ethylene glycol monomethyl ether, 1% of the fast curing agent prepared in step (1), and 83% of water were taken and mixed evenly at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0162] Example 2

[0163] A method for preparing an internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent, comprising the following steps:

[0164] (1) Preparation of rapid curing agent: A rapid curing agent is obtained by polycondensation reaction using oleic acid, diethylenetriamine, and xylene as raw materials. The specific preparation steps include:

[0165] (11) Take 0.1 mol of oleic acid, 0.105 mol of diethylenetriamine and 1.2 mol of xylene and place them in a reaction vessel (such as a three-necked flask), mix them evenly to obtain a mixture;

[0166] (12) Slowly heat the mixture to 190°C, keep it at that temperature for 5 hours, and then distill, filter, and dry to obtain the rapid curing agent.

[0167] (2) Preparation of internally catalytic rapid-reaction water-based sand-stabilizing agent:

[0168] Based on the total mass of the internally catalytic fast-reaction water-based sand-fixing agent, 12% diglycidyl ether, 1% diethylene glycol methyl ether, 0.4% of the fast curing agent prepared in step (1), and 86.6% water were taken and mixed evenly at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0169] Example 3

[0170] A method for preparing an internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent, comprising the following steps:

[0171] (1) Preparation of rapid curing agent: A rapid curing agent is obtained by polycondensation reaction using oleic acid, diethylenetriamine, and xylene as raw materials. The specific preparation steps include:

[0172] (11) Take 0.1 mol of oleic acid, 0.11 mol of diethylenetriamine and 1.2 mol of xylene and place them in a reaction vessel (three-necked flask). Mix them evenly to obtain a mixture.

[0173] (12) The mixture is slowly heated to 200°C, kept at the temperature for 4 hours, and then distilled under reduced pressure, filtered and dried to obtain a fast curing agent.

[0174] (2) Preparation of internally catalytic rapid-reaction water-based sand-stabilizing agent:

[0175] Based on the total mass of the internally catalytic fast-reaction water-based sand-fixing agent, 12% of 1,4-butanediol diglycidyl ether, 0.75% of triethylene glycol dimethyl ether, 0.5% of fast-curing agent, and 86.75% of water were taken and mixed evenly at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0176] Example 4

[0177] A method for preparing an internally catalytically catalyzed, fast-reaction water-based sand-stabilizing agent, comprising the following steps:

[0178] (1) Preparation of rapid curing agent: A rapid curing agent is obtained by polycondensation reaction using erucic acid, diethylenetriamine, and xylene as raw materials. The specific preparation steps include:

[0179] (11) Take 0.1 mol of erucic acid, 0.1 mol of diethylenetriamine and 1.5 mol of xylene and place them in a reaction vessel (three-necked flask). Mix them evenly to obtain a mixture.

[0180] (12) The mixture is slowly heated to 200°C and kept at that temperature for 5 hours. The mixture is then distilled under reduced pressure, filtered, and dried to obtain a fast curing agent.

[0181] (2) Preparation of internally catalytic rapid-reaction water-based sand-stabilizing agent:

[0182] Based on the total mass of the internally catalytic fast-reaction water-based sand-fixing agent, take 10% resorcinol diglycidyl ether, 0.5% tetraethylene glycol dimethyl ether, 0.4% fast curing agent, and 89.1% water respectively, and mix them evenly at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

[0183] Experiment and Analysis

[0184] 1. Curing time, compressive strength, and permeability tests

[0185] The internally catalytic rapid-reaction water-based sand-fixing agents prepared in Examples 1-4 were used as research objects to investigate their curing time, compressive strength and permeability.

[0186] The specific experimental procedure is as follows: The internally catalytic, fast-reaction water-based sand-fixing agents prepared in Examples 1-4 were sequentially numbered 1#, 2#, 3#, and 4#, and their curing time, compressive strength, and permeability were evaluated according to SY / T6572-2003 "Performance Evaluation Method for Resins for Sand Control" and Q / SH10201969-2016 "General Technical Conditions for Sand-Fixing Agents". The test results are shown in Table 1.

[0187] Table 1 Evaluation results of internally catalytic fast-reaction water-based sand-stabilizing agents

[0188] serial number Curing temperature, ℃ Curing time, h Compressive strength, MPa Penetration rate, D 1# 50 10 5.32 1.1 2# 60 10.5 5.17 1.3 3# 70 10.8 4.85 1.2 4# 80 12 4.60 1.5

[0189] 2. Viscosity test

[0190] Test method: The internally catalytic rapid-reaction water-based sand-fixing agents prepared in Examples 1-4 were numbered sequentially as 1#, 2#, 3#, and 4#;

[0191] Take 20 mL of internally catalytic rapid-reaction water-based sand-fixing agent and place it in the measuring cylinder. Use a rotational viscometer to measure the viscosity of the product at room temperature. Within the test range, the viscosity values ​​are all less than 5 mPa·s. The results are shown in Table 2.

[0192] Table 2. Viscosity test results of internally catalytic fast-reaction water-based sand-stabilizing agent

[0193]

[0194] The above test results show that the internally catalytic rapid-reaction water-based sand-fixing agent can solidify rapidly in 10-12 hours. The strength and permeability of the solidified sand body meet the requirements of current standards, and can effectively achieve controllable high-strength sand fixation in the near-wellbore zone of oil and water wells.

[0195] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An internally catalytic, fast-reaction water-based sand-stabilizing agent, characterized in that, It consists of the following components by weight percentage: Glycidyl ether 10%-15%, miscibility agent 0.5%-1%, fast curing agent 0.4%-1%, balance is water.

2. The internally catalytic, fast-reaction water-based sand-stabilizing agent as described in claim 1, characterized in that, The glycidyl ether is one or more of diglycidyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, and resorcinol diglycidyl ether.

3. The internally catalytic, fast-reaction water-based sand-stabilizing agent as described in claim 1, characterized in that, The miscible agent is one or more of ethylene glycol monomethyl ether, diethylene glycol methyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.

4. The internally catalytic, fast-reaction water-based sand-stabilizing agent as described in claim 1, characterized in that, The fast-curing agent is a long-chain alkyl imidazoline.

5. The internally catalytic, fast-reaction water-based sand-stabilizing agent as described in claim 4, characterized in that, The long-chain alkyl imidazoline is one or more of imidazoline laurate, imidazoline oleate, and imidazoline erucic acid, and / or The structural formula of the long-chain alkyl imidazoline is as follows: in: R is one or more of lauryl alkyl, oleyl alkyl, and erucic acid alkyl.

6. A method for preparing an internally catalytic, fast-reaction water-based sand-stabilizing agent according to any one of claims 1-5, characterized in that, The specific steps are as follows: (1) Preparation of rapid curing agent; (2) Mix the formula amount of glycidyl ether, the formula amount of miscible agent, the formula amount of fast curing agent and the formula amount of water at room temperature to obtain the internally catalytic fast-reaction water-based sand-fixing agent.

7. The preparation method of an internally catalytically catalyzed, rapidly reacting water-based sand-stabilizing agent as described in claim 6, characterized in that, On a molar mass basis, step (1) includes the following steps: (11) Place 1 part of long-chain fatty acid, 1-1.1 parts of polyethylene polyamine and 10-15 parts of organic solvent in a reaction vessel and mix them evenly to obtain a mixture; (12) Adjust the temperature of the mixture to 180-200℃, reflux for at least 4 hours to obtain the reaction solution, and then process it to obtain the fast curing agent.

8. The preparation method of the internally catalytic rapid-reaction water-based sand-stabilizing agent as described in claim 7, characterized in that, The polyethylene polyamine mentioned in step (11) is one or more of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine, and / or The organic solvent mentioned in step (11) is one or more of toluene and xylene, and / or The long-chain fatty acid mentioned in step (11) is one or more of lauric acid, oleic acid, and erucic acid.

9. The preparation method of an internally catalytically catalyzed, rapidly reacting water-based sand-stabilizing agent as described in claim 7, characterized in that, The post-processing described in step (12) consists of rotary evaporation or vacuum evaporation, filtration, and drying.

10. An internally catalytic, fast-reaction water-based sand-stabilizing agent, characterized in that, Prepared by the preparation method according to any one of claims 6-9.

11. The application of the internally catalytic rapid-reaction water-based sand-fixing agent according to any one of claims 1-5 and 10 for rapid sand fixation in sand-control wells of loose sandstone oil reservoirs.

12. The application as described in claim 11, characterized in that, The internally catalytic, fast-reaction water-based sand-fixing agent is suitable for formation temperatures of 50–80℃ and has a sand-fixing time of 10–12 hours. It is used for chemical sand control in vertical, inclined, sidetracked, and small-diameter wells in loose sandstone reservoirs.

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