A coagulation and dispersion aid and its use

Abstract

The application provides a viscosity stabilizing and drainage aid and application thereof. The viscosity stabilizing and drainage aid comprises fluorocarbon surfactant, hydrocarbon surfactant, alcohol, stabilizer, organic salt and water.

Description

Technical Field

[0001] This invention relates to the field of fracturing agents, and particularly to a viscosity stabilizer fracturing agent for fracturing. Background Technology

[0002] Hydraulic fracturing is a common technique in oil and gas well development, especially in the exploration and development of low-permeability oil and gas fields. It plays a crucial role in reducing fluid flow resistance and increasing well production. During fracturing operations, water-based fracturing fluids may interact physically and chemically with formation rocks and minerals, causing damage to both the liquid and solid phases. To prevent clogging, appropriate additives are needed to reduce reservoir damage during fracturing and facilitate the rapid removal of the working fluid. In low-permeability oil and gas reservoirs with high clay content, both clay stabilizers and drainage aids must be added to the fracturing fluid to prevent damage caused by clay expansion and fracturing fluid retention. Using both agents simultaneously may lead to incompatibility (antagonism), failure to achieve synergistic effects, and higher costs. Developing integrated clay stabilizers and drainage aids is significant for reducing costs, improving fracturing fluid performance, and enhancing operational efficiency.

[0003] With existing technology, when the product dosage is 2%, the anti-swelling rate is generally 75% to 85%, and the surface tension in fracturing fluid is generally 22 to 25 mN / m. There is still room for improvement in the anti-swelling effect and the drainage assistance effect. Summary of the Invention

[0004] One aspect of the present invention provides a viscosity stabilizer and drainage aid, which comprises a fluorocarbon surfactant, a hydrocarbon surfactant, an alcohol, a stabilizer, an organic salt, and water.

[0005] In one specific embodiment, based on the total mass of the viscosity stabilizer and drainage aid, the content of the fluorocarbon surfactant is 1% to 3%, the content of the hydrocarbon surfactant is 1% to 3%, the content of the alcohol is 2% to 3%, the content of the stabilizer is 0.5% to 1%, and the content of the organic salt is 5% to 10%.

[0006] In one specific embodiment, the fluorocarbon surfactant is an anionic fluorocarbon surfactant and / or a nonionic fluorocarbon surfactant.

[0007] In one specific embodiment, the fluorocarbon surfactant is at least one of OBS, FC-01, and TF281.

[0008] In one specific embodiment, the hydrocarbon surfactant is at least one of sodium dodecylbenzenesulfonate, sodium hexadecylsulfonate, and sodium dodecyl alcohol polyoxyethylene ether sulfate.

[0009] In one specific embodiment, the alcohol is at least one selected from isopropanol, propanol, n-butanol, ethylene glycol, and ethanol.

[0010] In one specific embodiment, the stabilizer is at least one of ZYPA-1, diethylenetriamine, and NH-1.

[0011] In one specific embodiment, the organic salt is potassium formate and / or ammonium formate.

[0012] The second invention provides the application of the viscosity stabilizer and flow aid according to any one of the inventions in the preparation of fracturing fluids.

[0013] The beneficial effects of this invention are:

[0014] The clay stabilizer for fracturing of this invention exhibits good compatibility and synergy among its raw materials. It also possesses excellent long-lasting anti-swelling and flowback-aiding properties. At a dosage of 2%, the anti-swelling rate reaches 97.85%, and the water wash resistance rate reaches 100%, effectively inhibiting clay hydration swelling and dispersion migration over a long period. At a low dosage of 0.15%, the surface tension reaches 20.63 mN / m, and the interfacial tension reaches 1.07 mN / m. It shows good compatibility with water-based fracturing fluids, with minimal fluctuations in surface and interfacial tension, which is beneficial for improving the flowback effect of fracturing fluid. The fracturing clay stabilizer and flowback-aiding agent is simple to prepare and low in cost, combining the effects of stabilizing clay and aiding flowback, effectively reducing reservoir damage and improving flowback efficiency. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments. However, the embodiments of the present invention are merely illustrative examples and should not be construed as limiting the present invention under any circumstances.

[0016] The fluorocarbon surfactant OBS (sodium perfluorononenoxybenzenesulfonate) was purchased from Nantong Runfeng Petrochemical Co., Ltd.

[0017] Fluorocarbon surfactant FC-01 was purchased from Shanghai Yingzheng Technology Co., Ltd.

[0018] Fluorocarbon surfactant TF281 was purchased from Shanghai Futian Chemical Technology Co., Ltd.

[0019] Polyamine ZYPA-1 was purchased from the Drilling Engineering Technology Research Institute of Zhongyuan Petroleum Engineering Co., Ltd.

[0020] Polyetheramine NH-1 was purchased from the Nanjing Chemical Industry Group Research Institute.

[0021] The polymer variable viscosity drag reducer was purchased from Dongying Spray Petroleum Engineering Technology Co., Ltd.

[0022] All other chemical materials were obtained from commercial sources.

[0023] Example 1

[0024] Step 1: Add 2.0g of isopropanol to 88.2g of distilled water and stir until homogeneous to obtain the first solution;

[0025] Step 2: Mix 1.0g OBS with 1.5g sodium dodecylbenzenesulfonate, 1.0g sodium dodecyl alcohol polyoxyethylene ether sulfate, and 0.5g sodium hexadecyl sulfonate, and stir thoroughly to obtain the second solution;

[0026] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0027] Step 4: Add 0.3g ZYPA-1 and 0.5g diethylenetriamine to the third solution in step 3, and stir thoroughly to obtain the fourth solution;

[0028] Step 5: Add 5.0g of potassium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesive stabilizer and drainage aid.

[0029] Table 1 Raw Material List for Example 1

[0030]

[0031] Example 2

[0032] Step 1: Add 1.0g propanol and 1.0g n-butanol to 83.2g distilled water, stir well to obtain the first solution;

[0033] Step 2: Mix 2.0g OBS with 2.0g sodium dodecylbenzenesulfonate and stir thoroughly to obtain the second solution;

[0034] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0035] Step 4: Add 0.3g NH-1 and 0.5g diethylenetriamine to the third solution in step 3, and stir thoroughly to obtain the fourth solution;

[0036] Step 5: Add 10.0g of ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0037] Table 2 Raw Material List for Example 2

[0038]

[0039] Example 3

[0040] Step 1: Add 1.0g of ethylene glycol and 2.0g of n-butanol to 84.0g of distilled water, stir well to obtain the first solution;

[0041] Step 2: Mix 3.0g OBS with 1.0g sodium dodecyl alcohol polyoxyethylene ether sulfate and 0.5g sodium hexadecyl sulfonate, and stir thoroughly to obtain the second solution;

[0042] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0043] Step 4: Add 0.5g ZYPA-1 to the third solution in Step 3, stir thoroughly to obtain the fourth solution;

[0044] Step 5: Add 4.0g potassium formate and 4.0g ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0045] Table 3 Raw Material List for Example 3

[0046]

[0047] Example 4

[0048] Step 1: Add 2.0g of ethanol to 83.2g of distilled water and stir well to obtain the first solution;

[0049] Step 2: Mix 1.0g FC-01 with 1.5g sodium dodecylbenzenesulfonate and 1.5g sodium hexadecylsulfonate, and stir thoroughly to obtain the second solution;

[0050] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0051] Step 4: Add 0.3g ZYPA-1 and 0.5g NH-1 to the third solution in step 3, and stir thoroughly to obtain the fourth solution;

[0052] Step 5: Add 6.0g potassium formate and 4.0g ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0053] Table 4 Raw Material List for Example 4

[0054]

[0055] Example 5

[0056] Step 1: Add 1.5g of ethanol and 0.5g of n-butanol to 85.0g of distilled water, stir well to obtain the first solution;

[0057] Step 2: Mix 2.0g FC-01 with 2.0g sodium dodecyl polyoxyethylene ether sulfate and stir thoroughly to obtain the second solution;

[0058] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0059] Step 4: Add 1.0 g of NH-1 to the third solution in step 3, stir thoroughly to obtain the fourth solution;

[0060] Step 5: Add 3.0g potassium formate and 5.0g ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0061] Table 5 Raw Material List for Example 5

[0062]

[0063] Example 6

[0064] Step 1: Add 0.5g ethanol, 1.0g ethylene glycol and 0.5g propanol to 83.0g distilled water, stir well to obtain the first solution;

[0065] Step 2: Mix 3.0g FC-01 with 0.5g sodium dodecylbenzenesulfonate and 0.5g sodium hexadecylsulfonate, and stir thoroughly to obtain the second solution;

[0066] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0067] Step 4: Add 1.0g of diethylenetriamine to the third solution in step 3, stir thoroughly to obtain the fourth solution;

[0068] Step 5: Add 4.0g potassium formate and 6.0g ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0069] Table 6 Raw Material List for Example 6

[0070]

[0071] Example 7

[0072] Step 1: Add 1.0g of ethanol and 1.0g of isopropanol to 85.4g of distilled water, stir well to obtain the first solution;

[0073] Step 2: Mix 1.0g TF281 with 1.5g sodium dodecylbenzenesulfonate and 1.5g sodium dodecyl polyoxyethylene ether sulfate, and stir thoroughly to obtain the second solution;

[0074] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0075] Step 4: Add 0.2g ZYPA-1, 0.2g NH-1 and 0.2g diethylenetriamine to the third solution in step 3, and stir thoroughly to obtain the fourth solution;

[0076] Step 5: Add 8.0g of potassium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesive stabilizer and drainage aid.

[0077] Table 7 Raw Material List for Example 7

[0078]

[0079] Example 8

[0080] Step 1: Add 1.0g propanol and 1.0g isopropanol to 85.0g distilled water, stir well to obtain the first solution;

[0081] Step 2: Mix 2.0g TF281 with 1.0g sodium hexadecyl sulfonate and 1.0g sodium dodecyl polyoxyethylene ether sulfate, and stir thoroughly to obtain the second solution;

[0082] Step 3: Add the first solution obtained in Step 2 to the first solution obtained in Step 1, and stir thoroughly to obtain the third solution;

[0083] Step 4: Add 1.0 g of NH-1 to the third solution in step 3, stir thoroughly to obtain the fourth solution;

[0084] Step 5: Add 8.0g of ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0085] Table 8 Raw Material List for Example 8

[0086]

[0087] Example 9

[0088] Step 1: Add 1.0g ethylene glycol, 1.0g n-butanol and 1.0g isopropanol to 83.7g distilled water and stir until homogeneous to obtain the first solution;

[0089] Step 2: Mix 3.0g TF281 with 1.0g sodium hexadecyl sulfonate and 0.5g sodium dodecyl polyoxyethylene ether sulfate, and stir thoroughly to obtain the second solution;

[0090] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0091] Step 4: Add 0.8g of diethylenetriamine to the third solution in step 3, stir thoroughly to obtain the fourth solution;

[0092] Step 5: Add 5.0g potassium formate and 3.0g ammonium formate to the fourth solution in step 4, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0093] Table 9. Raw Material List for Example 9

[0094]

[0095] Comparative Example 1

[0096] Step 1: Add 1.0g of ethanol and 2.0g of isopropanol to 83.5g of distilled water, stir well to obtain the first solution;

[0097] Step 2: Add 1.5g sodium dodecylbenzenesulfonate, 1.0g sodium dodecyl polyoxyethylene ether sulfate and 0.5g sodium hexadecyl sulfonate to the first solution obtained in Step 1, and stir thoroughly to obtain the second solution;

[0098] Step 3: Add 0.5g ZYPA-1 to the second solution in Step 2, stir thoroughly to obtain the third solution;

[0099] Step 4: Add 5.0g potassium formate and 5.0g ammonium formate to the third solution in step 3, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0100] Table 10 Raw Material List for Comparative Example 1

[0101]

[0102] Comparative Example 2

[0103] Step 1: Add 1.0g propanol and 1.0g n-butanol to 86.0g distilled water, stir well to obtain the first solution;

[0104] Step 2: Add 3.0g of fluorocarbon surfactant OBS to the first solution obtained in Step 1, and stir thoroughly to obtain the second solution;

[0105] Step 3: Add 0.5g of diethylenetriamine and 0.5g of NH-1 to the second solution in Step 2, and stir thoroughly to obtain the third solution;

[0106] Step 4: Add 8.0g of potassium formate to the third solution in step 3, and stir thoroughly to obtain the adhesive stabilizer and drainage aid.

[0107] Table 11 Raw Material List for Comparative Example 2

[0108]

[0109] Comparative Example 3

[0110] Step 1: Add 1.0g of ethylene glycol and 2.0g of n-butanol to 84.5g of distilled water, stir well to obtain the first solution;

[0111] Step 2: Mix 2.0g of fluorocarbon surfactant OBS with 1.5g of sodium dodecylbenzenesulfonate and 1.0g of sodium dodecyl polyoxyethylene ether sulfate, and stir thoroughly to obtain the second solution;

[0112] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0113] Step 4: Add 3.0g potassium formate and 5.0g ammonium formate to the third solution in step 3, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0114] Table 12 Raw Material List for Comparative Example 3

[0115]

[0116] Comparative Example 4

[0117] Step 1: Add 2.0g of ethanol to 92.2g of distilled water and stir until homogeneous to obtain the first solution;

[0118] Step 2: Mix 3.0g of fluorocarbon surfactant FC-01 with 1.0g of sodium hexadecyl sulfonate and 1.0g of sodium dodecylbenzene sulfonate, and stir thoroughly to obtain the second solution;

[0119] Step 3: Add the second solution obtained in step 2 to the first solution obtained in step 1, and stir thoroughly to obtain the third solution;

[0120] Step 4: Add 0.3g ZYPA-1 and 0.5g NH-1 to the third solution in step 3, and stir thoroughly to obtain the viscosity stabilizer and drainage aid.

[0121] Table 13 Raw Material List for Comparative Example 4

[0122]

[0123] Comparative Example 5

[0124] Step 1: Mix 2.0g of fluorocarbon surfactant TF281 with 1.0g of sodium hexadecyl sulfonate and 1.0g of sodium dodecyl polyoxyethylene ether sulfate, and stir thoroughly to obtain the first solution;

[0125] Step 2: Add the first solution obtained in Step 1 to 87.0g of distilled water and stir thoroughly to obtain the second solution;

[0126] Step 3: Add 1.0 g of NH-1 to the second solution in Step 2, and stir thoroughly to obtain the third solution;

[0127] Step 4: Add 3.0g potassium formate and 5.0g ammonium formate to the third solution in step 3, and stir thoroughly to obtain the adhesion stabilizer and drainage aid.

[0128] Table 14 Raw Material List for Comparative Example 5

[0129]

[0130] Performance testing

[0131] 1. Performance evaluation of viscosity stabilizers and drainage aids

[0132] 2g of each of the viscosity stabilizing and drainage aids prepared in the examples or comparative examples was added to 98g of water and mixed thoroughly to obtain the test solutions of the viscosity stabilizing and drainage aids corresponding to each example or comparative example. The anti-swelling and water-washing resistance properties of the test solutions of the viscosity stabilizing and drainage aids were determined according to the method specified in 7.5 of SY / T 5971-2016 Performance Evaluation Method for Clay Stabilizers for Fracturing, Acidizing and Water Injection in Oil and Gas Fields. The anti-swelling rate and water-washing resistance rate were calculated based on the test results. The test results are shown in Table 15.

[0133] 0.15g of each viscosity stabilizer and drainage aid prepared in the examples or comparative examples was added to 99.85g of water and mixed thoroughly to obtain the test solutions of the viscosity stabilizer and drainage aids corresponding to each example or comparative example. The surface tension and interfacial tension of the test solutions of the viscosity stabilizer and drainage aids were measured according to the method specified in SY / T 5370-2018 Surface and Interfacial Tension Determination Method. The test results are shown in Table 15.

[0134] Table 15 Performance of Adhesion Stabilizers and Drainage Aids

[0135]

[0136] 2. Performance evaluation of water-based fracturing fluids containing viscosity stabilizers and flow aids

[0137] Water-based fracturing fluid base: Add 0.1g of polymer variable viscosity drag reducer and 0.075g of ammonium persulfate (breaker) to 100g of water and mix evenly to obtain water-based fracturing fluid base.

[0138] The viscosity stabilizer and drainage aid prepared in each embodiment were added to the water-based fracturing fluid base. The amount of viscosity stabilizer and drainage aid added was 0.15% (W / W) of the water-based fracturing fluid base. The mixture was stirred thoroughly to obtain the water-based fracturing fluid.

[0139] The anti-swelling and water-washing resistance properties of water-based fracturing fluids were determined according to the method specified in 7.5 of SY / T 5971-2016, Evaluation Method for Clay Stabilizers Used in Fracturing, Acidizing, and Water Injection in Oil and Gas Fields. The test results are shown in Table 16.

[0140] The surface tension and interfacial tension of the water-based fracturing fluid were measured according to the method specified in SY / T 5370-2018, "Methods for Determining Surface and Interfacial Tension". The test results are shown in Table 16.

[0141] Table 16 Performance of Water-Based Fracturing Fluids Containing Viscosity Stabilizers and Discharge Aids

[0142]

[0143]

[0144] As shown in Table 15, the viscosity stabilizer and flowback aid provided in this embodiment of the invention has excellent anti-swelling effect, water washability, and low surface and interfacial tension at a low dosage of 0.15%. It can inhibit the hydration and swelling of formation clay for a long time, prevent its dispersion and migration, and at the same time help improve the flowback rate of fracturing fluid, which is of great significance for reducing the damage of fracturing fluid to the formation. In contrast, Comparative Examples 1 to 5 were prepared by reducing the raw materials with different functions, and had limitations in simultaneously achieving anti-swelling and reducing surface and interfacial tension. It can be seen that the raw materials in this invention have good compatibility and synergy, and can achieve excellent anti-swelling and flowback aid performance at the same time.

[0145] As shown in Table 16, the anti-swelling rate of the water-based fracturing fluid containing the viscosity stabilizer and flow aid of the present invention decreased at a low dosage of 0.15%, but still reached 81.23%. The water wash resistance, surface tension and interfacial tension remained stable, indicating that the viscosity stabilizer and flow aid provided by the present invention has good compatibility with the water-based fracturing fluid.

[0146] In summary, the viscosity-stabilizing and flowback aid of this invention exhibits excellent and long-lasting anti-swelling effects, effectively inhibiting clay hydration swelling and dispersion migration, thus reducing formation damage. Its low surface and interfacial tensions are beneficial for improving the flowback effect of fracturing fluids. Furthermore, it has good compatibility with water-based fracturing fluids, with other additives in the fluid having minimal impact on surface and interfacial tensions, resulting in stable surface and interfacial tensions. Simultaneously, the fracturing viscosity-stabilizing and flowback aid of this invention is simple to prepare and low in cost, making it significant for reducing reservoir damage, improving oil and gas recovery rates, and lowering development costs.

[0147] While the present invention has been described with reference to specific embodiments, those skilled in the art will understand that various changes can be made without departing from the true spirit and scope of the invention. Furthermore, numerous modifications can be made to the subject, spirit, and scope of the invention to suit specific situations, materials, material compositions, and methods. All such modifications are included within the scope of the claims of the present invention.

Claims

1. A viscosity stabilizer and drainage aid, comprising a fluorocarbon surfactant, a hydrocarbon surfactant, an alcohol, a stabilizer, an organic salt, and water; in, The stabilizer is at least one of ZYPA-1, diethylenetriamine, and NH-1; The organic salt is potassium formate and / or ammonium formate; Based on the total mass of the viscosity stabilizer and drainage aid, the content of the fluorocarbon surfactant is 1% to 3%, the content of the hydrocarbon surfactant is 1% to 3%, the content of the alcohol is 2% to 3%, the content of the stabilizer is 0.5% to 1%, and the content of the organic salt is 5% to 10%. The fluorocarbon surfactant is at least one of OBS, FC-01 and TF281; The hydrocarbon surfactant is at least one of sodium dodecylbenzene sulfonate, sodium hexadecyl sulfonate, and sodium dodecyl alcohol polyoxyethylene ether sulfate. The alcohol is at least one selected from isopropanol, propanol, n-butanol, ethylene glycol, and ethanol.

2. The application of the viscosity stabilizer and flow aid according to claim 1 in the preparation of fracturing fluid.

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