CN112552884B - Anti-collapse drag reducer and production process thereof - Google Patents
Anti-collapse drag reducer and production process thereof Download PDFInfo
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Abstract
The invention relates to the technical field of petroleum drilling auxiliary agents, and particularly discloses an anti-collapse drag reducer and a production process thereof. The anti-collapse drag reducer is mainly prepared from the following raw materials in parts by weight: 20-30 parts of asphalt, 5-10 parts of sodium lignosulfonate, 10-20 parts of surfactant and 20-35 parts of polymer additive; the polymer additive is mainly prepared by mixing and reacting a polymerized monomer A, a polymerized monomer B and an initiator according to the mass ratio of 10-15:10-20: 0.1-0.5; the polymerized monomer A is at least one of acrylamide, ethyl methacrylate, lauric acrylate, 2-ethacrylic acid and hydroxyacrylic acid; the polymerized monomer B is at least one of 2-acryloxy-2-methylpropanesulfonic acid and 2-acrylamido-2-methylpropanesulfonic acid. The anti-collapse drag reducer has good drag reduction performance and high-temperature shear resistance.
Description
Technical Field
The invention relates to the technical field of petroleum drilling auxiliary agents, in particular to an anti-collapse drag reducer and a production process thereof.
Background
With the continuous development of oil and gas resources, the current oil and gas resource exploitation depth is deeper and deeper, so that an oil and gas well is easy to drill in complex strata such as loose strata and broken strata. These formations are poorly cemented and have thin pore walls and are susceptible to collapse and chipping when subjected to external forces. When drilling in such geological conditions, usually an anti-collapse agent or an anti-collapse drag reducer is added into the flushing fluid to perform the functions of bonding and wall protection. The common anti-collapse material comprises asphalt material, silicate material and the like, wherein the asphalt material can be softened and deformed at a certain temperature, has better anti-collapse performance and very low cost, and is an ideal anti-collapse material. However, since asphalt has a high softening point and viscosity in a usual case after being added to a rinse solution, it is difficult to disperse the asphalt and the coefficient of lubricity of the rinse solution is easily lowered. Therefore, asphalt materials are often combined with other materials to form the anti-collapse drag reducer in specific use.
The application publication No. CN108659799A of the invention discloses a cation modified asphalt for an anti-collapse plugging agent for drilling fluid, which is prepared from the following raw materials in parts by weight: 45-65 parts of petroleum asphalt powder, 25-40 parts of high-boiling-point solvent oil, 5-10 parts of a modifier, 3-8 parts of a surfactant and 1-3 parts of an adhesion inhibitor, wherein the modifier is one or two of oil-soluble phenolic resin and petroleum resin, the surfactant is one or two of hexadecyl trimethyl ammonium chloride and hexadecyl trimethyl ammonium bromide, and the adhesion inhibitor is one or more of polyanionic cellulose, sodium carboxymethyl cellulose and pregelatinized starch. The anti-collapse plugging agent cation modified asphalt is added with high-boiling-point solvent oil, and has a function of reducing the softening point of the asphalt.
In view of the above-mentioned related art, the inventors consider that the high temperature shear resistance of the cation modified asphalt of the anti-collapse plugging agent is poor.
Disclosure of Invention
In order to improve the high temperature shear resistance of the drag reducer, the application provides an anti-collapse drag reducer and a production process thereof.
In a first aspect, the present application provides an anti-collapse drag reducer, which adopts the following technical scheme:
an anti-collapse drag reducer is mainly prepared from the following raw materials in parts by weight: 20-30 parts of asphalt, 5-10 parts of sodium lignosulfonate, 10-20 parts of surfactant and 20-35 parts of polymer additive;
the polymer additive is mainly prepared by mixing and reacting a polymerized monomer A, a polymerized monomer B and an initiator according to the mass ratio of 10-15:10-20: 0.1-0.5; the polymerized monomer A is at least one of acrylamide, ethyl methacrylate, lauric acrylate, 2-ethacrylic acid and hydroxyacrylic acid; the polymeric monomer B is any one of 2-acryloyloxy-2-methylpropylsulfonic acid and 2-acrylamido-2-methylpropylsulfonic acid.
By adopting the technical scheme, the anti-collapse drag reducer is added with sodium lignosulfonate besides an asphalt material, can be matched with asphalt to obtain a composite material with a very low softening point, and can improve the dispersion efficiency of the asphalt material in a water phase by utilizing the sodium lignosulfonate. The polymer additive is obtained by polymerizing two different types of polymerized monomers, and the generated polymer contains various groups such as sulfonic groups, acyl groups or ester groups, can be well dispersed in a water phase, can have good binding capacity with asphalt, and further improves the shear resistance of the finally prepared anti-collapse drag reducer.
Preferably, the raw material also comprises 3-6 parts by weight of biochar, and the biochar is obtained by pyrolyzing wheat straws or corn straws.
By adopting the technical scheme, the biological carbon is added into the anti-collapse drag reducer, the biological carbon is prepared by pyrolyzing crop straws, the particles are small, and tests show that the biological carbon can obviously reduce the softening point of asphalt when being mixed in the anti-collapse drag reducer, so that the anti-collapse drag reducer has good high-temperature shear resistance after being injected into a stratum.
Preferably, the biochar is obtained by carrying out heat preservation on wheat straws or corn straws at the temperature of 400-600 ℃ for 6-8 h.
By adopting the technical scheme, the biochar is obtained by pyrolysis at the temperature, the carbon content of the pyrolyzed wheat straw or corn straw material is higher at the temperature, and the anti-collapse performance of the material can be improved by utilizing the supporting effect of carbon after the anti-collapse drag reducer is added.
Preferably, a cross-linking agent is further added during the mixing reaction during the preparation of the polymer additive, and the cross-linking agent is any one of dimethyldiallylammonium chloride, octyldimethylallylammonium chloride and p-methoxyphenyloctyldimethylallylammonium chloride.
By adopting the technical scheme, the cross-linking agent is added during the mixing reaction during the preparation of the polymer, so that the cross-linking complexity of the generated polymer additive can be improved, the polymer with a network structure is generated, and the anti-collapse performance of the finally prepared anti-collapse drag reducer is further improved.
Preferably, the mass ratio of the cross-linking agent to the polymerized monomer A is 5-8: 10-15.
By adopting the technical scheme, the addition amount of the cross-linking agent is less than that of the polymeric monomer A, so that the polymer chain of the finally prepared polymer additive still keeps higher acyl or ester group content, and the asphalt additive is ensured to have better softening and deformation effects on asphalt.
Preferably, diatomite is also added during the mixing reaction during the preparation of the polymer additive, and the mass ratio of the diatomite to the polymerized monomer A is 1.5-2.5: 10-15.
By adopting the technical scheme, the inorganic filler is added during the preparation of the polymer additive, so that the dispersing capacity of the polymer additive in a water phase can be improved, the supporting and pressure-resisting capacity of the polymer additive can be further improved, and the finally prepared anti-collapse drag reducer has better anti-collapse performance.
In a second aspect, the present application provides a production process of an anti-collapse drag reducer, which adopts the following technical scheme:
the production process of the anti-collapse drag reducer comprises the following steps:
1) mixing and reacting a polymerized monomer A, a polymerized monomer B and an initiator to prepare a polymer additive;
2) uniformly mixing asphalt, sodium lignosulphonate and polymer additive at the temperature of 100-140 ℃ to obtain a mixed solution;
3) adding a surfactant and water into the mixed solution prepared in the step 2), and uniformly mixing to obtain the water-based paint.
By adopting the technical scheme, the polymer additive is prepared firstly, and then is uniformly mixed with the asphalt at the temperature of 100-140 ℃, and the asphalt is softened at the temperature, so that the polymer additive and the sodium lignosulfonate can be uniformly dispersed in the asphalt to prepare the anti-collapse drag reducer with uniform texture.
Preferably, the mixing reaction in the step 1) is carried out for 6-8h at 50-60 ℃.
By adopting the technical scheme, the temperature during the mixing reaction is mild, the rate of the polymerization reaction can be controlled not to be too high, the chain length of the polymer generated by polymerization can be controlled not to be too long, the polymer with short and uniform chain length can be generated, and the anti-collapse performance and the drag reduction performance of the anti-collapse drag reducer are ensured.
Preferably, the step 2) of uniformly mixing is to heat the asphalt to 140 ℃ at first, then add the sodium lignosulfonate and uniformly mix, and then add the polymer additive and uniformly mix.
By adopting the technical scheme, the asphalt is softened after being heated to 140 ℃ of 100-.
Preferably, the step 3) of uniformly mixing is to stir at 60-70 ℃ for 30-40 min.
By adopting the technical scheme, the mixture of the asphalt, the sodium lignosulfonate and the polymer additive is kept at a certain temperature when being mixed with the surfactant and the water, so that the asphalt in the mixture can be kept to have lower viscosity, and the uniform mixing is facilitated.
In summary, the present application has the following beneficial effects:
1. the sodium lignosulfonate is added into the anti-collapse drag reducer, so that the softening point of asphalt is reduced, various raw materials are conveniently and uniformly mixed, and the dispersion efficiency of the asphalt in a water phase is improved. The polymer additive added into the anti-collapse drag reducer is obtained by polymerizing two polymer monomers, and a polymer chain of the polymer additive contains abundant active groups such as sulfonic groups, acyl groups and the like, so that the dispersion uniformity of the anti-collapse drag reducer in a water phase is further improved, the binding capacity of the polymer additive and asphalt is also improved, and the anti-collapse drag reducer has good high-temperature shear resistance and drag reduction performance.
2. The anti-collapse drag reducer further adds the biochar, the biochar is obtained by crop straw pyrolysis, particles are small and uniform, the softening point of asphalt can be further reduced, and the high-temperature-resistant shearing performance of the anti-collapse drag reducer is further improved.
Detailed Description
The present application will be described in further detail with reference to specific embodiments below.
In the following examples, the bitumen is white bitumen and the loss on drying of the bitumen is not greater than 10%. The pH is about 7-10. The high-temperature high-pressure filtration loss is not more than 25%.
In the production process of the anti-collapse drag reducer, a proper amount of auxiliary raw materials are also used during the preparation reaction of the polymeric additive, the auxiliary raw materials comprise an organic solvent, and the organic solvent is at least one of dichloromethane and toluene. The mass ratio of the organic solvent to the polymerized monomer A is 20-30: 1. Preferably, the organic solvent is formed by mixing dichloromethane and toluene according to the mass ratio of 1-2: 1-3.
When the surfactant is mixed with water, the mass ratio of the surfactant to the water is 1: 3-5.
Example 1
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 20kg of asphalt, 10kg of sodium lignosulfonate, 10kg of surfactant and 30kg of polymer additive. The mass ratio of the surfactant to the water is 1: 3.
Wherein the surfactant is sodium dodecyl benzene sulfonate. The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B and an initiator according to the weight ratio of 10:10:0.1, and a proper amount of auxiliary raw materials such as dichloromethane and ethanol are also used in the reaction, wherein the mass ratio of the dichloromethane to the polymerized monomer A is 20: 1. The polymerization monomer A is acrylamide, the polymerization monomer B is 2-acryloxy-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerized monomer A and a polymerized monomer B into a solvent dichloromethane, uniformly mixing, then adding an initiator, reacting for 8 hours at 50 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 20: 1;
2) heating asphalt to 120 ℃, adding sodium lignosulfonate under the stirring condition, continuously stirring and mixing for 20min, then adding a polymer additive, and continuously stirring for 10min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 3;
3) mixing the first mixed solution and the second mixed solution, and stirring at 60 deg.C for 40 min.
Example 2
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 30kg of asphalt, 10kg of sodium lignosulphonate, 20kg of surfactant and 20kg of polymer additive. The mass ratio of the surfactant to the water is 1: 3.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B and an initiator according to the weight ratio of 15:20:0.5, and a proper amount of auxiliary raw materials such as dichloromethane and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the polymerized monomer A is 20: 1. The polymerization monomer A is ethyl methacrylate, the polymerization monomer B is 2-acryloyloxy-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerized monomer A and a polymerized monomer B into a solvent dichloromethane, uniformly mixing, then adding an initiator, reacting for 6 hours at 60 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 20: 1;
2) heating asphalt to 140 ℃, adding sodium lignin sulfonate under stirring, continuously stirring and mixing for 10min, then adding a polymer additive, and continuously stirring for 15min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 3;
3) mixing the first mixed solution and the second mixed solution, and stirring at 70 deg.C for 30 min.
Example 3
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 25kg of asphalt, 5kg of sodium lignosulfonate, 15kg of surfactant and 35kg of polymer additive. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B and an initiator according to the weight ratio of 12:18:0.3, and a proper amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 15:15: 1. The polymerization monomer A is lauric acid acrylate, the polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerization monomer A and a polymerization monomer B into a solvent, uniformly mixing, then adding an initiator, reacting for 6.5 hours at 55 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 30: 1; the solvent is obtained by mixing dichloromethane and toluene in a mass ratio of 1: 1;
2) heating asphalt to 130 ℃, adding sodium lignosulfonate under the stirring condition, continuously stirring and mixing for 15min, then adding a polymer additive, and continuously stirring for 12min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 5;
3) mixing the first mixed solution and the second mixed solution, and stirring at 65 deg.C for 35 min.
Example 4
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 26kg of asphalt, 5kg of sodium lignosulfonate, 12kg of surfactant and 30kg of polymer additive. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent and an initiator according to the weight ratio of 12:18:5:0.3, and an appropriate amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 15:15: 1. The polymerization monomer A is lauric acid acrylate, the polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is dimethyl diallyl ammonium chloride.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerized monomer A, a polymerized monomer B and a cross-linking agent into solvent ethanol, uniformly mixing, then adding an initiator, reacting for 6.5 hours at 60 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 30: 1; the solvent is obtained by mixing dichloromethane and toluene in a mass ratio of 1: 1;
2) heating asphalt to 130 ℃, adding sodium lignosulfonate under the stirring condition, continuously stirring and mixing for 15min, then adding a polymer additive, and continuously stirring for 12min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 5;
3) mixing the first mixed solution and the second mixed solution, and stirring at 65 deg.C for 35 min.
Example 5
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 27kg of asphalt, 8kg of sodium lignosulfonate, 15kg of surfactant and 28kg of polymer additive. The mass ratio of the surfactant to the water is 1: 3.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent and an initiator according to the weight ratio of 12:18:8:0.5, and an appropriate amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 10:20: 1. The polymerized monomer A is formed by mixing 2-ethyl acrylic acid and ethyl methacrylate according to the mass ratio of 1: 5. The polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is octyl dimethyl allyl ammonium chloride.
The preparation method of the embodiment comprises the following steps:
1) adding a polymerized monomer A, a polymerized monomer B and a cross-linking agent into a solvent ethanol, uniformly mixing, then adding an initiator, reacting for 6.5 hours at 70 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 30: 1; the solvent is obtained by mixing dichloromethane and toluene in a mass ratio of 1: 2;
2) heating asphalt to 130 ℃, adding sodium lignosulfonate under the stirring condition, continuously stirring and mixing for 15min, then adding a polymer additive, and continuously stirring for 12min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 3;
3) mixing the first mixed solution and the second mixed solution, and stirring at 65 deg.C for 35 min.
Example 6
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 28kg of asphalt, 6kg of sodium lignosulfonate, 18kg of surfactant and 25kg of polymer additive. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent and an initiator according to the weight ratio of 13:18:6:0.3, and an appropriate amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 10:15: 1. The polymerized monomer A is formed by mixing 2-ethyl acrylic acid and ethyl methacrylate in a mass ratio of 1: 3. The polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is octyl dimethyl allyl ammonium chloride.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerized monomer A, a polymerized monomer B and a cross-linking agent into solvent ethanol, uniformly mixing, then adding an initiator, reacting for 6.5 hours at 65 ℃, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 25: 1; the solvent is obtained by mixing dichloromethane and toluene in a mass ratio of 2: 3;
2) heating asphalt to 130 ℃, adding sodium lignosulfonate under the stirring condition, continuously stirring and mixing for 15min, then adding a polymer additive, and continuously stirring for 15min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 5;
3) mixing the first mixed solution and the second mixed solution, and stirring at 60 deg.C for 30 min.
Example 7
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 25kg of asphalt, 8kg of sodium lignosulfonate, 10kg of surfactant, 35kg of polymer additive and 3kg of biochar. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent, an initiator and diatomite according to the weight ratio of 13:18:6:0.3:2, and an appropriate amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 10:15: 1. The polymerized monomer A is formed by mixing hydroxyacrylic acid and lauric acid acrylate in a mass ratio of 1: 3. The polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is p-methoxyphenyloctyl dimethyl allyl ammonium chloride.
The biochar is obtained by cooling and crushing corn straws after the corn straws are subjected to heat preservation at 400 ℃ for 8 hours.
The process for producing the anti-collapse drag reducer comprises the following steps:
1) adding a polymerized monomer A, a polymerized monomer B, a cross-linking agent and diatomite into solvent ethanol, uniformly mixing, then adding an initiator, reacting at 60 ℃ for 6.5 hours, filtering, washing with ethanol, and drying to obtain a polymer additive; the mass ratio of the solvent to the polymerized monomer A is 25: 1; the solvent is obtained by mixing dichloromethane and toluene in a volume ratio of 2: 3;
2) heating asphalt to 130 ℃, adding sodium lignosulfonate and biochar under the stirring condition, continuously stirring and mixing for 15min, adding a polymer additive, and continuously stirring for 15min to prepare a first mixed solution;
uniformly mixing a surfactant and water to obtain a second mixed solution; the mass ratio of the surfactant to the water is 1: 5;
3) mixing the first mixed solution and the second mixed solution, and stirring at 60 deg.C for 30 min.
Example 8
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 28kg of asphalt, 5kg of sodium lignosulfonate, 18kg of surfactant, 35kg of polymer additive and 6kg of biochar. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent and an initiator according to the weight ratio of 13:18:6:0.3, and an appropriate amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the polymerization reaction, wherein the mass ratio of the dichloromethane to the toluene to the polymerized monomer A is 10:15: 1. The polymerized monomer A is formed by mixing hydroxyacrylic acid and lauric acid acrylate in a mass ratio of 1: 3. The polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is p-methoxyphenyloctyl dimethyl allyl ammonium chloride.
The biochar is obtained by cooling and crushing wheat straws after heat preservation for 4 hours at 600 ℃.
The process for producing the anti-collapse drag reducer of this example is the same as that of example 7.
Example 9
The anti-collapse drag reducer of the embodiment is prepared from water and the following raw materials by weight: 28kg of asphalt, 5kg of sodium lignosulfonate, 18kg of surfactant, 30kg of polymer additive and 5kg of biochar. The mass ratio of the surfactant to the water is 1: 5.
Wherein the surfactant is octyl phenol polyoxyethylene ether (OP-10). The polymer additive is obtained by polymerizing a polymerized monomer A, a polymerized monomer B, a cross-linking agent and an initiator according to the weight ratio of 13:18:6:0.3, and a proper amount of auxiliary raw materials such as dichloromethane, toluene and ethanol are also used in the reaction, wherein the mass ratio of the dichloromethane, the toluene and the polymerized monomer A is 10:15: 1. The polymerized monomer A is formed by mixing 2-ethyl acrylic acid and ethyl methacrylate in a mass ratio of 1: 3. The polymerization monomer B is 2-acrylamide-2-methylpropanesulfonic acid, and the initiator is azobisisobutyronitrile. The cross-linking agent is p-methoxyphenyloctyl dimethyl allyl ammonium chloride.
The biochar is obtained by cooling and crushing wheat straws after heat preservation for 6 hours at 500 ℃.
The process for producing the anti-collapse drag reducer of this example is the same as that of example 7.
Comparative example 1
The anti-collapse drag reducer of this comparative example differs from example 1 in that sodium lignosulfonate is not included in the raw material. The others are the same as in example 1.
Comparative example 2
The anti-collapse drag reducer of this comparative example differs from example 1 in that the polymer additive in the raw material is polyacrylamide. The others are the same as in example 1.
Test examples
The anti-collapse drag reducer of examples 1-9 and comparative examples 1-2 was prepared according to SY/T5504.3-2018, part 3 of evaluation method of oil well cement admixture: the method in drag reducer tests the thickening time of the anti-collapse drag reducer (cement slurry) and the test results are shown in table 1.
The anti-collapse drag reducer of examples 1-9 and comparative examples 1-2 was tested for temperature and shear resistance according to SY/T5107 2005 Water-based fracturing fluid Performance evaluation method, and the test results are shown in Table 1.
The anti-collapse drag reducer in examples 1-9 and comparative examples 1-2 was tested for clear water drag reduction rate according to SY/T5107 2005 Water-based fracturing fluid Performance evaluation method, wherein the test result is shown in Table 1, the chemical concentration is 1%, the test pipe diameter is 10mm, and the linear velocity is 12 m/s.
TABLE 1 test results for anti-collapse drag reducers in examples 1 to 9 and comparative examples 1 to 2
It can be seen from the combination of example 1, comparative example 1 and table 1 that the anti-collapse drag reducer of the present application has a long thickening time, good high temperature shear resistance and a greatly improved drag reduction ratio.
As can be seen from the combination of example 1, comparative example 2 and table 1, the anti-collapse drag reducer of the present application, which uses the polymer additive, has a limited improvement in high temperature shear resistance compared to the drag reducer using polyacrylamide, but has a significantly improved drag reduction ratio.
To sum up, the anti-collapse drag reducer has high drag reduction rate, good high-temperature shear resistance and stronger adaptability.
Claims (3)
1. The production process of the anti-collapse drag reducer is characterized by comprising the following steps: the method comprises the following steps:
1) mixing a polymerized monomer A, a polymerized monomer B and an initiator according to the mass ratio of 10-15:10-20:0.1-0.5, then adding a cross-linking agent, diatomite and an organic solvent to react at 50-70 ℃ for 6-8h to prepare a polymer additive; the polymerized monomer A is at least one of acrylamide, ethyl methacrylate, lauric acrylate, 2-ethyl acrylic acid and hydroxyacrylic acid; the polymerized monomer B is any one of 2-acryloxy-2-methylpropanesulfonic acid and 2-acrylamido-2-methylpropanesulfonic acid; the mass ratio of the cross-linking agent to the polymerized monomer A is 5-8:10-15, and the cross-linking agent is any one of dimethyl diallyl ammonium chloride, octyl dimethyl allyl ammonium chloride and p-methoxybenzyl octyl dimethyl allyl ammonium chloride; the mass ratio of the diatomite to the polymeric monomer A is 1.5-2.5: 10-15; the organic solvent is formed by mixing dichloromethane and methane according to the mass ratio of 1-2: 1-3;
2) uniformly mixing 20-30 parts of asphalt, 5-10 parts of sodium lignosulfonate, 20-35 parts of polymer additive and 3-6 parts of biochar at the temperature of 100-; the biochar is obtained by carrying out heat preservation on wheat straws or corn straws at the temperature of 400-600 ℃ for 6-8 h;
3) adding 10-20 parts of surfactant and 30-100 parts of water into the mixed solution prepared in the step 2), and uniformly mixing to obtain the water-soluble organic fertilizer.
2. The process for the production of an anti-collapse drag reducer of claim 1, wherein: the step 2) of uniformly mixing is to heat the asphalt to 140 ℃ and then add the sodium lignosulfonate and uniformly mix, and then add the polymer additive and uniformly mix.
3. The process for the production of an anti-collapse drag reducer of claim 1, wherein: in the step 3), the mixture is stirred for 30-40min at 60-70 ℃.
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| US9546315B2 (en) * | 2011-05-28 | 2017-01-17 | Avello Bioenergy, Inc. | Compositions, methods, apparatus, and systems for incorporating bio-derived materials in drilling and hydraulic fracturing |
| CN102432751B (en) * | 2011-09-05 | 2013-11-27 | 中国石油大学(华东) | High-temperature colloid protecting anticaving fluid loss additive for drilling fluid and preparation method thereof |
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| CN109294531B (en) * | 2018-11-26 | 2021-03-12 | 天津普利华石油助剂有限公司 | Composite asphalt anti-collapse inhibitor of water-based drilling fluid, water-based drilling fluid and application of water-based drilling fluid |
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