CN114561203B - High-mineralization water-based delayed crosslinking gel fracturing fluid and preparation method thereof - Google Patents
High-mineralization water-based delayed crosslinking gel fracturing fluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-mineralization water-based delayed crosslinking gel fracturing fluid and a preparation method thereof, wherein the high-mineralization water-based delayed crosslinking gel fracturing fluid comprises the following components in percentage by weight: 0.3 to 0.5 percent wt percent of thickening agent, 0.3 to 0.5 percent of cross-linking agent, 0.3 to 0.5 percent wt percent of temperature stabilizer, 0.05 to wt percent of cleanup additive, 0.02 to 0.05 to wt percent of cleanup additive and the balance of hypersalinity brine; the fracturing fluid obtained by the invention can realize delayed crosslinking and gel formation aiming at deep well and ultra-deep well hydraulic fracturing. The volume of the fracturing fluid is resistant to the temperature of more than 180 ℃, the application range is wide, the fracturing fluid system can be directly configured by using high-salinity brine, and the problem of lack of fresh water resources in a construction site is effectively solved; and the raw materials are wide, the preparation method is simple, and the cost is low.
Description
Technical Field
The invention relates to the technical field of fracturing yield increase in the exploitation process of oil and gas fields, in particular to a high-mineralization water-based delayed crosslinking gel fracturing fluid and a preparation method thereof.
Background
Oil gas data is an important strategic material for national development and an important component of economic construction, and fracturing is a main yield-increasing measure of oil and gas reservoirs. With the continuous deep exploitation of oil gas, higher requirements are put on a fracturing yield increasing method and fracturing fluid. For example, in northwest regions of China, oil and gas resources are rich, meanwhile, the oil and gas resources are generally buried deeper than the recently discovered northwest oil fields relative to eastern regions, the well depth is generally over 8000 meters, and the stratum temperature can reach 180 ℃. Since northwest is a region of lack of fresh water, this presents a challenge to either the hydraulic or acid fracturing technology of the field. The reservoir yield-increasing reconstruction working fluid needs to have low friction resistance and high temperature resistance, and the two points have a certain contradiction. The high-temperature-resistant gel fracturing fluid system has extremely high viscosity and extremely high friction resistance in the pumping process.
Disclosure of Invention
The invention provides a high-mineralization water-based delayed crosslinking gel fracturing fluid and a preparation method thereof aiming at the problems existing in the prior art.
The technical scheme adopted by the invention is as follows:
the high-mineralization water-based delayed crosslinking gel fracturing fluid comprises the following components in percentage by weight: 0.3 to 0.5 percent of thickening agent, 0.3 to 0. wt percent of cross-linking agent, 0.5 to 0. wt percent of temperature stabilizer, 0.05 to wt percent of cleanup additive, 0.02 to 0.05 to wt percent of cleanup additive and the balance of hypersalinity brine.
Further, the thickening agent is five-membered copolymerized hydrophobic association thickening agent generated by polymerization reaction, wherein the mass ratio of the acrylamide to the acrylic acid to the methacryloxyethyl trimethyl ammonium chloride to the N-hexadecyl methacrylamide is 65:20:10:4.8:0.2.
Further, the crosslinking agent is an organozirconium crosslinking agent.
Further, the stabilizer is one of vitamin C, triethanolamine and sodium gluconate, and the cleanup additive is non-fluorine-containing cleanup additive FC-2; the hypersalinity saline water is 18-22 ten thousand mg/L saline water solution.
A preparation method of a high-mineralization water-based delayed crosslinking gel fracturing fluid comprises the following steps:
step 1: adding a thickening agent under the condition of stirring hypersalinity brine to completely dissolve the thickening agent;
step 2: and (3) adding a cross-linking agent, a temperature stabilizer and a cleanup additive into the solution obtained in the step (1) in sequence, and obtaining the required fracturing fluid after complete dissolution.
Further, the preparation method of the thickener comprises the following steps:
adding acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide into a solvent according to the mass ratio of 65:20:10:4.8:0.2 to obtain a polymerization reaction solution with the monomer mass concentration of 30wt percent;
adding sodium dodecyl sulfate into the polymerization reaction solution, and regulating the pH value to be neutral; wherein the mass ratio of the sodium dodecyl sulfate to the monomer is 10:1;
then adding an initiator, and reacting for 3-4 hours at the temperature of 40-50 ℃ to obtain the required thickener.
Then adding an initiator, and reacting for 3-4 hours at the temperature of 40-50 ℃ to obtain the required thickener.
Further, the preparation method of the cross-linking agent comprises the following steps:
adding zirconium oxychloride into a solution formed by mixing isopropanol and deionized water, and dissolving under the stirring condition; reacting for 6 hours at 50 ℃ to perform esterification reaction;
adding an organic carboxylic acid ligand and polyhydric alcohol into the reaction liquid, regulating the pH value to be neutral, and reacting for 3-4 hours at 50 ℃ to obtain the required organic zirconium cross-linking agent;
wherein the total mass of the organic carboxylic acid ligand and the polyol is two-thirds of the mass of the isopropanol, and the mass ratio of the organic carboxylic acid ligand to the polyol is 30:1.
Further, the mass ratio of the initiator to the ammonium persulfate to the sodium sulfite is 2:1.
Further, the stirring rotation speed in the step 1 is 1000t/min, and the step 2 is carried out after stirring for 5 minutes; step 2 was also carried out under stirring at a rotational speed of 1000 t/min.
The beneficial effects of the invention are as follows:
(1) The five-membered copolymerized hydrophobic association thickener is adopted, salt-resistant units are selected to provide equal amount of anionic and cationic charges for polymer molecules, polyacrylamide is selected to increase polymerization degree to improve molecular weight, meanwhile, the copolymer is ensured to have stronger water solubility, nonionic hydrophobic monomers are selected to avoid electrostatic repulsion existing in ionic hydrophobic monomers, and organic zirconium cross-linking agents are selected to realize delayed cross-linking to increase the temperature resistance and shearing resistance of a fracturing fluid system, so that the requirements of low friction resistance, high temperature resistance and high salt resistance of the fracturing fluid are ensured;
(2) The fracturing fluid obtained by the invention has the temperature resistance of more than 180 ℃ and wide application range;
(3) The fracturing fluid can be directly prepared by adopting high-salinity brine, and the problem of lack of fresh water resources in a construction site is solved.
Detailed Description
The invention will be further illustrated with reference to specific examples.
The high-mineralization water-based delayed crosslinking gel fracturing fluid comprises the following components in percentage by weight: 0.3 to 0.5 percent of thickening agent, 0.3 to 0. wt percent of cross-linking agent, 0.5 to 0. wt percent of temperature stabilizer, 0.05 to wt percent of cleanup additive, 0.02 to 0.05 to wt percent of cleanup additive and the balance of hypersalinity brine. The thickener is five-membered copolymerized hydrophobic association thickener which is formed by polymerization reaction and comprises acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide according to the mass ratio of 65:20:10:4.8:0.2. The cross-linking agent is an organozirconium cross-linking agent. The stabilizer is one of vitamin C, triethanolamine and sodium gluconate, and the cleanup additive is non-fluorine-containing cleanup additive FC-2 (available from Shandong Kerui Petroleum equipment Co., ltd.). The hypersalinity salt water is salt water solution with the mineralization degree of 18-22 ten thousand mg/L, and the salt water solution is formed by mixing one or two or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and sodium sulfate according to any proportion.
A preparation method of a high-mineralization water-based delayed crosslinking gel fracturing fluid comprises the following steps:
step 1: adding a thickening agent under the condition of stirring hypersalinity brine to completely dissolve the thickening agent;
the preparation method of the thickener comprises the following steps:
adding acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide into a solvent according to the mass ratio of 65:20:10:4.8:0.2 to obtain a polymerization reaction solution with the monomer mass concentration of 30wt percent;
adding sodium dodecyl sulfate into the polymerization reaction solution, and regulating the pH value to be neutral through a sodium hydroxide solution; wherein the mass ratio of the sodium dodecyl sulfate to the monomer is 10:1;
then adding an initiator, and reacting for 3-4 hours at the temperature of 40-50 ℃ to obtain the required thickener. The initiator is formed by mixing ammonium persulfate and sodium sulfite in a mass ratio of 2:1.
The stirring rotating speed in the step 1 is 1000t/min, and the step 2 is carried out after stirring for 5 minutes; step 2 was also carried out under stirring at a rotational speed of 1000 t/min.
Step 2: and (3) adding a cross-linking agent, a temperature stabilizer and a cleanup additive into the solution obtained in the step (1) in sequence, and obtaining the required fracturing fluid after complete dissolution.
The preparation method of the cross-linking agent comprises the following steps:
adding zirconium oxychloride into a solution formed by mixing isopropanol and deionized water, and dissolving under the stirring condition; reacting for 6 hours at 50 ℃ to perform esterification reaction;
adding organic carboxylic acid ligand and polyalcohol into the reaction liquid, adjusting pH value to neutrality by ammonia water, and reacting for 3-4 hours at 50 ℃ to obtain the required organic zirconium cross-linking agent. Wherein the total mass of the organic carboxylic acid ligand and the polyol is two-thirds of the mass of the isopropanol, and the mass ratio of the organic carboxylic acid ligand to the polyol is 30:1.
Example 1
The preparation method comprises the following steps of:
step 1: a brine system 1L with a mineralization of 18 ten thousand mg/L was prepared and then stirred with a high-speed stirrer at a rotational speed of 1000 r/min. 3 g thickener SG was slowly added. Stirring for 5 minutes allowed to dissolve thoroughly.
The preparation method of the thickener comprises the following steps:
acrylamide, acrylic acid, methacryloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide are added into a solvent according to the mass ratio of 65:20:10:4.8:0.2 to prepare a polymerization reaction solution with the monomer mass concentration of 30 and wt percent.
Adding 0.1 g sodium dodecyl sulfonate into a polymerization reaction solution, adding a sodium hydroxide solution to adjust the pH value to be neutral, adding an oxidation-reduction system initiator formed by ammonium persulfate and sodium sulfite in a mass ratio of 2:1, and adding the initiator, wherein the mass concentration of the initiator in the solution is 0.01 wt percent. The reaction temperature is 50 ℃ and the reaction time is 4 hours, thus obtaining the needed five-membered copolymerized hydrophobic association polymer thickener SG.
Step 2: after the thickener is completely dissolved, 3 g of cross-linking agent YC-1, 1 g of temperature stabilizer triethanolamine and 0.5 g of cleanup additive FC-2 are added under the stirring condition of rotating speed of 1000 r/min. Stirring until the gel fracturing fluid is thoroughly dissolved, and obtaining the volume YL1 of the high-mineralization water-based delayed crosslinking gel fracturing fluid.
The preparation method of the cross-linking agent comprises the following steps:
15 g isopropanol and 30 g deionized water are mixed in a flask, 15 g zirconium oxychloride is added, a magnet is stirred until the zirconium oxychloride is completely dissolved, the mixture is reacted for 6 hours at the constant temperature of 50 ℃, and then 10 g lactic acid/xylitol system (the mass ratio of lactic acid to xylitol is 30:1) is weighed and mixed into the reaction solution. Ammonia water is adopted to adjust the pH value to be neutral, the temperature is controlled to be 50 ℃, and the organic zirconium cross-linking agent YC-1 can be obtained after the reaction for 4 hours.
Example 2
The preparation method comprises the following steps of:
the preparation method comprises the following steps of:
step 1: a brine system 1L having a mineralization of 20 ten thousand mg/L was prepared, and then stirred at a rotation speed of 1000 r/min using a high-speed stirrer. 3 g thickener SG was slowly added. Stirring for 5 minutes allowed to dissolve thoroughly.
The preparation method of the thickener comprises the following steps:
acrylamide, acrylic acid, methacryloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide are added into a solvent according to the mass ratio of 65:20:10:4.8:0.2 to prepare a polymerization reaction solution with the monomer mass concentration of 30 and wt percent.
Adding 0.1 g sodium dodecyl sulfonate into a polymerization reaction solution, adding a sodium hydroxide solution to adjust the pH value to be neutral, adding an oxidation-reduction system initiator formed by ammonium persulfate and sodium sulfite in a mass ratio of 2:1, and adding the initiator, wherein the mass concentration of the initiator in the solution is 0.01 wt percent. The reaction temperature is 40 ℃ and the reaction time is 3 hours, thus obtaining the needed five-membered copolymerized hydrophobic association polymer thickener SG.
Step 2: after the thickener is completely dissolved, 3 g of cross-linking agent YC-1, 1 g of temperature stabilizer triethanolamine and 0.5 g of cleanup additive FC-2 are added under the stirring condition of rotating speed of 1000 r/min. Stirring until the gel fracturing fluid is thoroughly dissolved, and obtaining the volume YL2 of the high-mineralization water-based delayed crosslinking gel fracturing fluid.
The preparation method of the cross-linking agent comprises the following steps:
15 g isopropanol and 30 g deionized water are mixed in a flask, 15 g zirconium oxychloride is added, a magnet is stirred until the zirconium oxychloride is completely dissolved, the mixture is reacted for 6 hours at the constant temperature of 50 ℃, and then a 10 g succinic acid/glycerol system (the mass ratio of succinic acid to glycerol is 30:1) is weighed and mixed into the reaction solution. Ammonia water is adopted to adjust the pH value to be neutral, the temperature is controlled to be 50 ℃, and the organic zirconium cross-linking agent YC-2 can be obtained after 3 to 4 (3) hours of reaction.
The properties of the highly mineralized water-based delayed crosslinked gel fracturing fluid systems YL obtained in example 1 and example 2 were tested (the conventional test method used in the test method), and the results are shown in table 1.
TABLE 1 detection results
The high-mineralization water-based delayed crosslinking gel fracturing fluid can realize delayed crosslinking gel formation aiming at deep well and ultra-deep well hydraulic fracturing. The fracturing fluid has the advantages of high temperature resistance of more than 180 ℃ and wide application range, the fracturing fluid system can be directly configured by high-salinity brine, the problem of lack of fresh water resources on a construction site is effectively solved, the raw materials are wide, the preparation method is simple, and the cost is low.
Claims (7)
1. The high-mineralization water-based delayed crosslinking gel fracturing fluid is characterized by comprising the following components in percentage by weight: 0.3 to 0.5wt.% of thickening agent, 0.3 to 0.5wt.% of cross-linking agent, 0.05wt.% of temperature stabilizer, 0.02 to 0.05wt.% of cleanup additive, and the balance being hypersalinity brine; the thickening agent is five-membered copolymerized hydrophobic association thickening agent generated by polymerization reaction, wherein the mass ratio of the acrylamide to the acrylic acid to the methacryloyloxyethyl trimethyl ammonium chloride to the 2-acrylamide-2-methylpropanesulfonic acid to the N-hexadecyl methacrylamide is 65:20:10:4.8:0.2; the cross-linking agent is an organozirconium cross-linking agent.
2. The hypersalinity water-based delayed crosslinking gel fracturing fluid according to claim 1, wherein the stabilizer is one of vitamin C, triethanolamine and sodium gluconate, and the cleanup additive is non-fluorine-containing cleanup additive FC-2; the hypersalinity saline water is 18-22 ten thousand mg/L saline water solution.
3. A method for preparing the high-mineralization water-based delayed crosslinking gel fracturing fluid according to any one of claims 1 to 2, which is characterized by comprising the following steps:
step 1: adding a thickening agent under the condition of stirring hypersalinity brine to completely dissolve the thickening agent;
step 2: and (3) adding a cross-linking agent, a temperature stabilizer and a cleanup additive into the solution obtained in the step (1) in sequence, and obtaining the required fracturing fluid after complete dissolution.
4. The preparation method of claim 3, wherein the thickener is prepared by the following steps:
adding acrylamide, acrylic acid, methacryloyloxyethyl trimethyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecyl methacrylamide into a solvent according to the mass ratio of 65:20:10:4.8:0.2 to obtain a polymerization reaction solution with the monomer mass concentration of 30 wt%;
adding sodium dodecyl sulfate into the polymerization reaction solution, and regulating the pH value to be neutral; wherein the mass ratio of the sodium dodecyl sulfate to the monomer is 10:1;
then adding an initiator, and reacting for 3-4 hours at the temperature of 40-50 ℃ to obtain the required thickener.
5. A method of preparation according to claim 3, wherein the cross-linking agent is prepared by:
adding zirconium oxychloride into a solution formed by mixing isopropanol and deionized water, and dissolving under the stirring condition; reacting for 6 hours at 50 ℃ to perform esterification reaction;
adding an organic carboxylic acid ligand and polyhydric alcohol into the reaction liquid, regulating the pH value to be neutral, and reacting for 3-4 hours at 50 ℃ to obtain the required organic zirconium cross-linking agent;
wherein the total mass of the organic carboxylic acid ligand and the polyol is two-thirds of the mass of the isopropanol, and the mass ratio of the organic carboxylic acid ligand to the polyol is 30:1.
6. The preparation method according to claim 4, wherein the initiator is a mixture of ammonium persulfate and sodium sulfite, and the mass ratio of the ammonium persulfate to the sodium sulfite is 2:1.
7. The preparation method according to claim 3, wherein the stirring speed in the step 1 is 1000t/min, and the step 2 is performed after stirring for 5 minutes; step 2 is also carried out under stirring at a rotational speed of 1000 t/min.
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|---|---|
| CN114561203A (en) | 2022-05-31 |
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