CN110003877B - High-salinity-resistant clean variable-viscosity slickwater, cross-linking agent, variable-viscosity resistance-reducing agent and preparation method - Google Patents
High-salinity-resistant clean variable-viscosity slickwater, cross-linking agent, variable-viscosity resistance-reducing agent and preparation method Download PDFInfo
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Abstract
The invention belongs to the technical field of fracturing modification of oil and gas well reservoirs, and discloses a hypersalinity-resistant clean variable-viscosity slickwater, a cross-linking agent, a variable-viscosity resistance-reducing agent and a preparation method, wherein the cross-linking agent comprises the following components in percentage by weight: sodium borate decahydrate, sodium citrate, zirconium oxychloride, ethylene glycol, glycerol, sodium chloride and the balance of water; the variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing slickwater is prepared from a viscosity-changing cross-linking agent and a base liquid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.1-1: 999-999.9; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.1-0.3 mL: 499.7-499.9 g; the preparation method of the cross-linking agent comprises the following steps: A. preparing an alcohol-based solution; B. preparing an alcohol-based mixed solution; C. and stirring the alcohol-based mixed solution for reaction under a closed condition, and cooling to obtain the cross-linking agent. The base fluid of the invention has increased viscosity after crosslinking, does not influence the resistance reduction effect of the fluid, and can well meet the fracturing construction.
Description
Technical Field
The invention belongs to the technical field of oil and gas well reservoir fracturing modification, and particularly relates to a hypersalinity-resistant clean viscosity-variable slickwater, a cross-linking agent, a viscosity-variable resistance-reducing agent and a preparation method thereof.
Background
Slickwater is a fracturing fluid system for hydraulic fracturing of shale oil and gas reservoirs, and is one of key liquids for shale gas development. Compared with the traditional gel fracturing fluid system, the slickwater fracturing fluid system is widely applied to shale gas development by virtue of the characteristics of high efficiency and low cost.
Compared with the traditional gel fracturing fluid system, the slickwater fracturing fluid system is widely applied to shale gas development by virtue of the characteristics of high efficiency and low cost. The resistance reducing agent is used as a core auxiliary agent of the slickwater fracturing fluid system, and directly determines the performance and application of the slickwater fracturing fluid system.
By 2014, a slickwater hydraulic fracturing technology and a horizontal well technology are core technologies mainly adopted by American shale gas exploitation, wherein the key of slickwater hydraulic fracturing lies in preparation of fracturing fluid, and the aims of improving shale gas layer permeability, increasing flow conductivity, optimizing production conditions, reducing formation damage and meeting economic development can be fulfilled through fracturing. In recent years, slickwater fracturing develops rapidly, the number of sections of staged fracturing of a multi-stage horizontal well reaches up to 40 sections, and the total amount of slickwater fracturing fluid required reaches up to 14 million cubic meters per well. 98.0-99.5 percent of the slickwater fracturing fluid is sand mixing water, and the additive generally accounts for 0.5-2.0 percent of the total volume of the slickwater and comprises a resistance reducing agent, a surfactant, a scale inhibitor, a clay stabilizer, a bactericide and the like. The resistance reducing agent is a core additive of the slickwater fracturing fluid; acrylamide polymers, polyethylene oxide (PEO), guar gum and its derivatives, cellulose derivatives, viscoelastic surfactants, and the like can be used as the resistance reducing agent.
At present, the slickwater in the market is common slickwater and does not have the effect of viscosity changing, once the viscosity of the prepared slickwater cannot be changed and increased, liquid needs to be prepared again under different construction conditions during fracturing construction, and the difficulty during construction is increased.
Disclosure of Invention
In order to solve the problems in the prior art and overcome the problem that the viscosity of the conventional slickwater can not be adjusted at any time according to the construction condition, the invention aims to provide the hypersalinity-resistant clean variable-viscosity slickwater, the cross-linking agent, the variable-viscosity resistance reducing agent and the preparation method thereof.
The technical scheme adopted by the invention is as follows:
a high-salinity-resistant crosslinking agent for cleaning, thickening and slickwater is prepared from the following components in percentage by weight: 7% -15% of sodium borate decahydrate; 2% -4% of sodium citrate; 0.5% -1.5% zirconium oxychloride; 20% -28% of ethylene glycol; 10% -15% of glycerol; 2% -4% of sodium chloride; the balance being water.
Further, the variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12-17% of acrylamide, 3-7% of 2-acrylamide-2-methylpropanesulfonic acid, 2.5-4.5% of dodecyl dimethyl allyl ammonium chloride, 6-10% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2-0.5% of initiator, 8.5-9.0 of pH regulator and the balance of water.
Further, the initiator is potassium persulfate.
Further, the weight ratio of the viscosity-changing resistance-reducing agent to water in the viscosity-changing slippery water is 0.1-1: 999-999.9.
A preparation method of a cross-linking agent for hypersalinity-resistant clean sticky slickwater comprises the following steps: A. uniformly mixing water, ethylene glycol and glycerol to obtain an alcohol-based solvent; adding sodium borate decahydrate into the alcohol-based solution, and uniformly mixing to obtain an alcohol-based solution;
C. mixing the alcohol-based solution, sodium chloride and sodium citrate uniformly to obtain an alcohol-based mixed solution;
C. and (3) stirring the alcohol-based mixed solution for reaction for 2.5 to 3.5 hours at the temperature of between 45 and 50 ℃ under a closed condition, and cooling to obtain the cross-linking agent.
A preparation method of a viscosity-changing resistance-reducing agent in high-salinity-resistant clean viscosity-changing slippery water is provided, wherein the viscosity-changing resistance-reducing agent is prepared by the following method;
the method comprises the following steps:
A. sequentially adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dodecyl dimethyl allyl ammonium chloride and 3-allyl-2-hydroxy-1-propane sodium sulfonate at the water temperature of 60-70 ℃ and uniformly mixing to obtain a uniform mixture; adjusting the pH value of the uniformly mixed solution to 8.5-9.0 by using a pH8.5-9.0 regulator to obtain an adjusting solution;
B. slowly adding an initiator into the regulating solution in a nitrogen atmosphere, and stirring for reaction to obtain a viscosity-changing resistance-reducing solution;
C. and drying and crushing the viscosity-changing resistance-reducing liquid to obtain the viscosity-changing resistance-reducing agent.
Further, the reaction temperature of the step B is 60-70 ℃; the reaction time is 3.5-4.5 h.
A hypersalinity resistant clean slimy slickwater is prepared from a slimy cross-linking agent and a base fluid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.1-1: 999-999.9; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.1-0.3 mL: 499.7-499.9 g;
the cross-linking agent comprises the following components in percentage by weight: 7% -15% of sodium borate decahydrate; 2% -4% of sodium citrate; 0.5% -1.5% zirconium oxychloride; 20% -28% of ethylene glycol; 10% -15% of glycerol; 2% -4% of sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12 to 17 percent of acrylamide, 3 to 7 percent of 2-acrylamide-2-methylpropanesulfonic acid, 2.5 to 4.5 percent of dodecyl dimethyl allyl ammonium chloride, 6 to 10 percent of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2 to 0.5 percent of initiator, 8.5 to 9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
Further, the preparation method of the hypersalinity-resistant clean and sticky slickwater comprises the following steps:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
Further, the specific steps of the step a are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
The invention has the beneficial effects that: the invention relates to a high salinity-resistant clean variable-viscosity slickwater, a cross-linking agent, a variable-viscosity resistance reducing agent and a preparation method thereof, which overcome the technical problem that the viscosity of the conventional slickwater can not be adjusted at any time according to the construction condition; the invention uses the viscosity-changing resistance-reducing agent, the viscosity-changing slippery water prepared by the viscosity-changing resistance-reducing agent and a cross-linking agent; the liquid preparation mode is changed during on-site construction, so that liquids with different viscosities can be adjusted at any time according to construction conditions, and different base liquids do not need to be replaced; meanwhile, the viscosity of the base fluid is increased after crosslinking, but the resistance reducing effect of the fluid is not influenced, and the fracturing construction can be well met. The preparation method has the advantages of simple and environment-friendly synthesis process, small consumption of the viscosity-changing and resistance-reducing agent and great reduction of construction cost.
Drawings
FIG. 1 is a graph showing the results of a drag reduction test in a case where tap water contains 0.1% by mass of slimy slick water.
FIG. 2 is a graph showing the results of a drag reduction test after crosslinking of a slimy slick water containing 0.1% by mass of tap water.
FIG. 3 is a graph showing the results of a drag reduction experiment in 2 ten thousand of mineralized water containing 0.1% by mass of slimy slick water.
FIG. 4 is a graph showing the results of a drag reduction experiment after cross-linking of a slimy slick water containing 0.1% by mass of 2 ten thousand of mineralization water.
FIG. 5 is a graph showing the results of a drag reduction test before crosslinking of a slimy slick water containing 0.07% by mass of tap water.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
A high-salinity-resistant crosslinking agent for cleaning, thickening and slickwater is prepared from the following components in percentage by weight: 7% -15% of sodium borate decahydrate; 2% -4% of sodium citrate; 0.5% -1.5% zirconium oxychloride; 20% -28% of ethylene glycol; 10% -15% of glycerol; 2% -4% of sodium chloride; the balance being water.
Further, the variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12-17% of acrylamide, 3-7% of 2-acrylamide-2-methylpropanesulfonic acid, 2.5-4.5% of dodecyl dimethyl allyl ammonium chloride, 6-10% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2-0.5% of initiator, 8.5-9.0 of pH regulator and the balance of water.
Further, the initiator is potassium persulfate.
Further, the weight ratio of the viscosity-changing resistance-reducing agent to water in the viscosity-changing slippery water is 0.1-1: 999-999.9.
A preparation method of a cross-linking agent for hypersalinity-resistant clean sticky slickwater comprises the following steps: A. uniformly mixing water, ethylene glycol and glycerol to obtain an alcohol-based solvent; adding sodium borate decahydrate into the alcohol-based solution, and uniformly mixing to obtain an alcohol-based solution;
D. mixing the alcohol-based solution, sodium chloride and sodium citrate uniformly to obtain an alcohol-based mixed solution;
C. and (3) stirring the alcohol-based mixed solution for reaction for 2.5 to 3.5 hours at the temperature of between 45 and 50 ℃ under a closed condition, and cooling to obtain the cross-linking agent.
A preparation method of a viscosity-changing resistance-reducing agent in high-salinity-resistant clean viscosity-changing slippery water is provided, wherein the viscosity-changing resistance-reducing agent is prepared by the following method;
the method comprises the following steps:
A. sequentially adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dodecyl dimethyl allyl ammonium chloride and 3-allyl-2-hydroxy-1-propane sodium sulfonate at the water temperature of 60-70 ℃ and uniformly mixing to obtain a uniform mixture; adjusting the pH value of the uniformly mixed solution to 8.5-9.0 by using a pH8.5-9.0 regulator to obtain an adjusting solution;
B. slowly adding an initiator into the regulating solution in a nitrogen atmosphere, and stirring for reaction to obtain a viscosity-changing resistance-reducing solution;
C. and drying and crushing the viscosity-changing resistance-reducing liquid to obtain the viscosity-changing resistance-reducing agent.
Further, the reaction temperature of the step B is 60-70 ℃; the reaction time is 3.5-4.5 h.
A hypersalinity resistant clean slimy slickwater is prepared from a slimy cross-linking agent and a base fluid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.1-1: 999-999.9; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.1-0.3 mL: 499.7-499.9 g;
the cross-linking agent comprises the following components in percentage by weight: 7% -15% of sodium borate decahydrate; 2% -4% of sodium citrate; 0.5% -1.5% zirconium oxychloride; 20% -28% of ethylene glycol; 10% -15% of glycerol; 2% -4% of sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12 to 17 percent of acrylamide, 3 to 7 percent of 2-acrylamide-2-methylpropanesulfonic acid, 2.5 to 4.5 percent of dodecyl dimethyl allyl ammonium chloride, 6 to 10 percent of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2 to 0.5 percent of initiator, 8.5 to 9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
Further, the preparation method of the hypersalinity-resistant clean and sticky slickwater comprises the following steps:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
Further, the specific steps of the step a are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
Example 1
A high-salinity-resistant crosslinking agent for cleaning, thickening and slickwater is prepared from the following components in percentage by weight: 7% sodium borate decahydrate; 2% sodium citrate; 0.5% zirconium oxychloride; 20% ethylene glycol; 10% of glycerol; 2% sodium chloride; the balance being water.
A preparation method of a cross-linking agent for hypersalinity-resistant clean sticky slickwater comprises the following steps: A. uniformly mixing water, ethylene glycol and glycerol to obtain an alcohol-based solvent; adding sodium borate decahydrate into the alcohol-based solution, and uniformly mixing to obtain an alcohol-based solution;
E. mixing the alcohol-based solution, sodium chloride and sodium citrate uniformly to obtain an alcohol-based mixed solution;
C. and (3) stirring the alcohol-based mixed solution for reaction for 2.5 hours at 45 ℃ under a closed condition, and cooling to obtain the cross-linking agent.
Example 2
A high-salinity-resistant crosslinking agent for cleaning, thickening and slickwater is prepared from the following components in percentage by weight: 10% sodium borate decahydrate; 3% sodium citrate; 1.0% zirconium oxychloride; 24% ethylene glycol; 12% of glycerol; 3% sodium chloride; the balance being water.
A preparation method of a cross-linking agent for hypersalinity-resistant clean sticky slickwater comprises the following steps: A. uniformly mixing water, ethylene glycol and glycerol to obtain an alcohol-based solvent; adding sodium borate decahydrate into the alcohol-based solution, and uniformly mixing to obtain an alcohol-based solution;
F. mixing the alcohol-based solution, sodium chloride and sodium citrate uniformly to obtain an alcohol-based mixed solution;
C. and (3) stirring the alcohol-based mixed solution for reaction for 3 hours at 48 ℃ under a closed condition, and cooling to obtain the cross-linking agent.
Example 3
A high-salinity-resistant crosslinking agent for cleaning, thickening and slickwater is prepared from the following components in percentage by weight: 15% sodium borate decahydrate; 4% sodium citrate; 1.5% zirconium oxychloride; 28% ethylene glycol; 15% of glycerol; 4% sodium chloride; the balance being water.
A preparation method of a cross-linking agent for hypersalinity-resistant clean sticky slickwater comprises the following steps: A. uniformly mixing water, ethylene glycol and glycerol to obtain an alcohol-based solvent; adding sodium borate decahydrate into the alcohol-based solution, and uniformly mixing to obtain an alcohol-based solution;
G. mixing the alcohol-based solution, sodium chloride and sodium citrate uniformly to obtain an alcohol-based mixed solution;
C. and (3) stirring the alcohol-based mixed solution for reaction for 3.5 hours at 50 ℃ under a closed condition, and cooling to obtain the cross-linking agent.
Example 4
The variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 17 percent of acrylamide, 7 percent of 2-acrylamide-2-methylpropanesulfonic acid, 4.5 percent of dodecyl dimethyl allyl ammonium chloride, 10 percent of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.5 percent of initiator, 8.5 to 9.0 of pH regulator and the balance of water.
Further, the initiator is potassium persulfate.
Further, the weight ratio of the viscosity-changing resistance-reducing agent to water in the viscosity-changing slippery water is 1: 999.
a preparation method of a viscosity-changing resistance-reducing agent in high-salinity-resistant clean viscosity-changing slippery water is provided, wherein the viscosity-changing resistance-reducing agent is prepared by the following method;
the method comprises the following steps:
A. sequentially adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dodecyl dimethyl allyl ammonium chloride and 3-allyl-2-hydroxy-1-propane sodium sulfonate at the temperature of 70 ℃ and uniformly mixing to obtain a uniformly mixed solution; adjusting the pH value of the uniformly mixed solution to 9.0 by using a pH8.5-9.0 regulator to obtain an adjusting solution;
B. slowly adding an initiator into the regulating solution in a nitrogen atmosphere, and stirring for reaction to obtain a viscosity-changing resistance-reducing solution;
C. and drying and crushing the viscosity-changing resistance-reducing liquid to obtain the viscosity-changing resistance-reducing agent.
The reaction temperature of the step B is 70 ℃; the reaction time was 4.5 h. The pH8.5-9.0 regulator is sodium hydroxide solution.
Example 5
The variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12 percent of acrylamide, 3 percent of 2-acrylamide-2-methylpropanesulfonic acid, 2.5 percent of dodecyl dimethyl allyl ammonium chloride, 6 percent of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2 percent of initiator, 8.5 to 9.0 of pH regulator and the balance of water.
Further, the initiator is potassium persulfate.
Further, the weight ratio of the viscosity-changing resistance-reducing agent to water in the viscosity-changing slippery water is 0.1: 999.9.
a preparation method of a viscosity-changing resistance-reducing agent in high-salinity-resistant clean viscosity-changing slippery water is provided, wherein the viscosity-changing resistance-reducing agent is prepared by the following method;
the method comprises the following steps:
A. sequentially adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dodecyl dimethyl allyl ammonium chloride and 3-allyl-2-hydroxy-1-propane sodium sulfonate at the temperature of 60 ℃ and uniformly mixing to obtain a uniformly mixed solution; adjusting the pH value of the uniformly mixed solution to 8.5 by using a pH8.5-9.0 regulator to obtain an adjusting solution;
B. slowly adding an initiator into the regulating solution in a nitrogen atmosphere, and stirring for reaction to obtain a viscosity-changing resistance-reducing solution;
C. and drying and crushing the viscosity-changing resistance-reducing liquid to obtain the viscosity-changing resistance-reducing agent.
Further, the temperature of the reaction in the step B is 60 ℃; the reaction time was 3.5 h.
The pH8.5-9.0 regulator is sodium hydroxide solution.
Example 6
The variable-viscosity slippery water consists of a variable-viscosity resistance reducing agent and water; the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 15% of acrylamide, 5% of 2-acrylamide-2-methylpropanesulfonic acid, 3% of dodecyl dimethyl allyl ammonium chloride, 7% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.3% of initiator, 8.5-9.0 of pH regulator and the balance of water.
The initiator is potassium persulfate.
The weight ratio of the viscosity-changing resistance-reducing agent to water in the viscosity-changing slippery water is 0.5: 999.5.
a preparation method of a viscosity-changing resistance-reducing agent in high-salinity-resistant clean viscosity-changing slippery water is provided, wherein the viscosity-changing resistance-reducing agent is prepared by the following method;
the method comprises the following steps:
A. sequentially adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dodecyl dimethyl allyl ammonium chloride and 3-allyl-2-hydroxy-1-propane sodium sulfonate at the temperature of 65 ℃ and uniformly mixing to obtain a uniformly mixed solution; adjusting the pH value of the uniformly mixed solution to 8.8 by using a pH8.5-9.0 regulator to obtain an adjusting solution;
B. slowly adding an initiator into the regulating solution in a nitrogen atmosphere, and stirring for reaction to obtain a viscosity-changing resistance-reducing solution;
C. and drying and crushing the viscosity-changing resistance-reducing liquid to obtain the viscosity-changing resistance-reducing agent.
Further, the temperature of the reaction in the step B is 65 ℃; the reaction time was 4 h.
Example 7
A hypersalinity resistant clean slimy slickwater is prepared from a slimy cross-linking agent and a base fluid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.1: 999.9; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.1 mL: 499.9 g;
the cross-linking agent comprises the following components in percentage by weight: 7% sodium borate decahydrate; 2% sodium citrate; 0.5% zirconium oxychloride; 20% ethylene glycol; 10% of glycerol; 2% sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12% of acrylamide, 3% of 2-acrylamide-2-methylpropanesulfonic acid, 2.5% of dodecyl dimethyl allyl ammonium chloride, 6% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2% of initiator, 8.5-9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
A preparation method of high-salinity-resistant clean sticky slickwater comprises the following steps:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
Further, the specific steps of the step a are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
Example 8
A hypersalinity resistant clean slimy slickwater is prepared from a slimy cross-linking agent and a base fluid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 1: 999; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.3 mL: 499.7 g;
the cross-linking agent comprises the following components in percentage by weight: 15% sodium borate decahydrate; 4% sodium citrate; 1.5% zirconium oxychloride; 28% ethylene glycol; 15% of glycerol; 4% sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 17% of acrylamide, 7% of 2-acrylamide-2-methylpropanesulfonic acid, 4.5% of dodecyl dimethyl allyl ammonium chloride, 10% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.5% of initiator, 8.5-9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
Further, the preparation method of the hypersalinity-resistant clean and sticky slickwater comprises the following steps:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
Further, the specific steps of the step a are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
Example 9
A hypersalinity resistant clean slimy slickwater is prepared from a slimy cross-linking agent and a base fluid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.4: 999.6, respectively; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.2 mL: 499.8 g;
the cross-linking agent comprises the following components in percentage by weight: 10% sodium borate decahydrate; 3% sodium citrate; 1% zirconium oxychloride; 25% ethylene glycol; 12% of glycerol; 3% sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 14% of acrylamide, 4% of 2-acrylamide-2-methylpropanesulfonic acid, 4% of dodecyl dimethyl allyl ammonium chloride, 8% of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.4% of initiator, 8.5-9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
A preparation method of high-salinity-resistant clean sticky slickwater comprises the following steps:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
The specific steps of the step A are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
Example 10
1. And (3) synthesis of the viscosity-changing and resistance-reducing agent: heating 70kg of water to 65-70 ℃, sequentially adding 14kg of acrylamide, 5kg of 2-acrylamido-2-methylpropanesulfonic acid, 3kg of dodecyl dimethyl allyl ammonium chloride and 7.5kg of 3-allyl-2-hydroxy-1-propane sodium sulfonate, stirring and adding the raw materials, keeping the temperature between 65 and 70 ℃ after complete dissolution, and adjusting the pH value of the liquid to 8.5 to 9.0 by using a proper amount of caustic soda flakes to obtain a liquid I;
and introducing nitrogen as protective gas into the liquid I, slowly adding 0.5kg of initiator potassium persulfate, keeping the reaction temperature at about 65 ℃, stirring to fully react for 3.5-4.5h, and cooling to obtain liquid II.
And drying and crushing the liquid II to obtain the viscosity-changing resistance-reducing agent.
2. Preparation of cross-linking agent for slickwater
Adding 25kg of ethylene glycol and 12kg of glycerol into 46kg of water in sequence to obtain an alcohol-based solvent, adding 10kg of sodium borate decahydrate into the alcohol-based solvent after uniformly stirring, and dissolving while stirring to obtain a liquid I after completely dissolving;
adding 3kg of sodium chloride, 1kg of zirconium oxychloride and 3kg of sodium citrate into the first liquid in sequence to obtain a second liquid;
and heating the liquid II to 45-50 ℃ under a closed condition, stirring for reacting for 2.5-3.5h, and cooling to room temperature to obtain the cross-linking agent for slickwater.
3. Preparation of slimy slickwater
999.0g of tap water is taken, 1.000g of the variable-viscosity slippery water drag reducer is slowly added under the stirring condition, the mixture is stirred for 5min and fully swelled, the mixture is placed in a water bath at 25 ℃ for 2h, and the viscosity of the base solution is measured by a capillary and recorded; 499.80g of this base solution was taken, 0.20ml of the above-obtained crosslinking agent for slickwater was slowly added under stirring, and after 2 minutes of slow stirring, the viscosity after crosslinking was measured with a six-speed rotational viscometer and recorded.
The composition of the modified slimy slickwater under different conditions is shown in table 1 below.
TABLE 1
Performance test
Reference NBT14003.2-2016 Tab Performance index and test methods, comparative data graphs were obtained for determining the friction resistance of tap water and slickwater prepared in example 10, as shown in FIGS. 1-5. The drag reduction in FIG. 1 is 73.7%; the drag reduction in FIG. 2 is 70.9%; the drag reduction in FIG. 3 is 72.3%; the drag reduction in FIG. 4 is 71.5%; the drag reduction in fig. 5 was 75.9%.
As can be seen from fig. 5, the drag reduction rate of 0.07% of the ligand liquid for the drag reduction agent for the variable-viscosity and slippery water is 75.9% measured in a test tube with an inner diameter of 8mm at a linear speed of 10m/s, which meets the measurement standard result in reference NBT14003.2-2016 drag reduction agent performance index and test method, and the drag reduction agent for the variable-viscosity and slippery water has a good construction effect and can completely meet the construction requirement.
As can be seen from the figures 1-4, the slimy and slippery water of the embodiment maintains better resistance reduction rate no matter in tap water or water with 2 ten thousand mineralization degrees after being crosslinked, so that the invention can adjust the liquid with different viscosities at any time according to the construction condition without replacing different base liquids; meanwhile, the viscosity of the base fluid is increased after crosslinking, but the resistance reducing effect of the fluid is not influenced, and the fracturing construction can be well met. The preparation method has the advantages of simple and environment-friendly synthesis process, small consumption of the viscosity-changing and resistance-reducing agent and great reduction of construction cost.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (3)
1. The hypersalinity-resistant clean viscosity-variable slickwater is characterized in that: the viscosity-changing slickwater is prepared from a viscosity-changing cross-linking agent and a base liquid; the base liquid consists of a viscosity-changing resistance-reducing agent and water; the weight ratio of the viscosity-changing resistance-reducing agent to the water is 0.1-1: 999-999.9; the volume weight ratio of the variable-viscosity cross-linking agent to the base fluid is 0.1-0.3 mL: 499.7-499.9 g;
the cross-linking agent comprises the following components in percentage by weight: 7% -15% of sodium borate decahydrate; 2% -4% of sodium citrate; 0.5% -1.5% zirconium oxychloride; 20% -28% of ethylene glycol; 10% -15% of glycerol; 2% -4% of sodium chloride; the balance of water;
the viscosity-changing resistance-reducing agent is prepared from the following raw materials in percentage by weight: 12 to 17 percent of acrylamide, 3 to 7 percent of 2-acrylamide-2-methylpropanesulfonic acid, 2.5 to 4.5 percent of dodecyl dimethyl allyl ammonium chloride, 6 to 10 percent of 3-allyl-2-hydroxy-1-propane sodium sulfonate, 0.2 to 0.5 percent of initiator, 8.5 to 9.0 of pH regulator and the balance of water;
the water in the base liquid is water with the mineralization degree of less than 2 ten thousand.
2. A method of making a hypersalinity resistant clean slimy slick water composition as claimed in claim 1, comprising the steps of:
A. mixing water and the viscosity-changing and resistance-reducing agent uniformly to obtain a base solution;
B. and uniformly mixing the base solution and the variable-viscosity cross-linking agent to obtain the variable-viscosity slippery water.
3. The method for preparing the hypersalinity-resistant clean and sticky slickwater according to the claim 2, characterized in that the concrete steps of the step A are as follows: mixing water and the viscosity-changing and resistance-reducing agent, stirring for 5min, and standing in a water bath at 25 ℃ for 2h to obtain a base solution; the specific steps of the step B are as follows: slowly adding the variable-viscosity cross-linking agent into the base solution, and stirring for 2min to obtain clean variable-viscosity slippery water;
the water is water with the mineralization degree below 2 ten thousand.
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| CN112142909B (en) * | 2019-06-28 | 2022-06-03 | 中国石油天然气股份有限公司 | Resistance reducing agent and preparation method thereof |
| CN110564397A (en) * | 2019-09-20 | 2019-12-13 | 四川申和新材料科技有限公司 | cleaning thickening agent, preparation method thereof and deep coal bed gas integrated acid fracturing fluid |
| CN111205847B (en) * | 2020-01-18 | 2020-12-29 | 海兴县新源化工有限公司 | Oil well fracturing cross-linking agent, preparation device and preparation method thereof |
| CN111763511B (en) * | 2020-06-28 | 2021-07-06 | 中国石油集团长城钻探工程有限公司压裂公司 | Preparation and liquid preparation method of integrated self-crosslinking thickener modified polymer for fracturing |
| CN112920322A (en) * | 2021-03-24 | 2021-06-08 | 四川省威沃敦化工有限公司 | Variable-temperature variable-viscosity resistance-reducing agent for multistage fracturing of shale gas and preparation method thereof |
| CN113027405B (en) * | 2021-03-24 | 2023-12-05 | 四川省威沃敦石油科技股份有限公司 | Hydraulic fracturing construction method for heterogeneous stratum |
| CN113122220B (en) * | 2021-04-26 | 2022-10-21 | 北京富达鑫辉能源科技有限公司 | Variable-viscosity fracturing fluid and preparation method thereof |
| CN113214816A (en) * | 2021-05-14 | 2021-08-06 | 西南石油大学 | Variable-viscosity slippery water and preparation method thereof |
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Denomination of invention: A kind of anti-high salinity clean and viscous slick water, crosslinking agent, variable viscosity resistance reducing agent and preparation method Effective date of registration: 20220803 Granted publication date: 20210727 Pledgee: China Minsheng Banking Corp Chengdu branch Pledgor: SICHUAN SHENHE NEW MATERIAL TECHNOLOGY Co.,Ltd. Registration number: Y2022510000229 |
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