CN111690398A - Fracturing fluid stock solution, acidizing fracturing fluid, resistance reducing water and sand-carrying fracturing fluid and preparation methods thereof - Google Patents
Fracturing fluid stock solution, acidizing fracturing fluid, resistance reducing water and sand-carrying fracturing fluid and preparation methods thereof Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
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- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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Abstract
The invention relates to the field of fracturing fluid for oil and gas field reconstruction, in particular to a fracturing fluid stock solution and a preparation method thereof, an acidized fracturing fluid, resistance reducing water and sand-carrying fracturing fluid, wherein the fracturing fluid emulsion is formed by polymerizing emulsion, and the emulsion is formed by mixing water phase and oil phase; the acidizing fracturing fluid is prepared from 1.0-2.0% of emulsion, 1-1.5% of corrosion inhibitor, 0.5-1% of iron ion stabilizer, 0.1-0.3% of acid cleanup additive, 10-30% of acid and the balance of water, wherein the emulsion is a fracturing fluid stock solution; the water reducing and resisting agent is prepared from 0.04-0.12% of emulsion, 0.1-0.2% of cleanup additive, 0.2-0.5% of anti-swelling agent and the balance of water; the sand-carrying fracturing fluid is prepared from 1-2.5% of emulsion, 0.2-0.5% of anti-swelling agent, 0.15-0.4% of cleanup additive and the balance of water. The fracturing fluid stock solution, the acidizing fracturing fluid and the water-reducing and blocking or sand-suspending fracturing fluid need different fracturing fluid emulsions, the formula can be adjusted at any time according to the actual situation in field construction, and the fracturing fluid has better demulsification performance under the condition of not adding a demulsifier, and has the advantages of simple production process, low cost and outstanding temperature and salt resistance.
Description
Technical Field
The invention relates to the field of fracturing fluid for oil and gas field reconstruction, in particular to a fracturing fluid stock solution, an acidizing fracturing fluid, resistance reducing water and sand carrying fracturing fluid and a preparation method thereof.
Background
The fracturing fluid is a heterogeneous unstable chemical system formed by a plurality of additives according to a certain proportion, is a working fluid used for fracturing modification of an oil-gas layer, and mainly has the functions of transmitting high pressure formed by ground equipment into a stratum, enabling the stratum to fracture to form a fracture and conveying a propping agent along the fracture.
The method is characterized in that a high-pressure large-displacement pump is adopted on the ground, a liquid pressure transmission principle is utilized, fracturing fluid is injected into an oil layer at a pressure which is larger than the absorption capacity of the oil layer, the pressure in a shaft is gradually increased, so that high pressure is suppressed at the bottom of a well, and when the pressure is larger than the ground stress near the well wall and the tensile strength of stratum rocks, a crack is generated in the stratum near the bottom of the well: and continuously injecting a sand carrying fluid with a propping agent, extending the fracture forwards and filling the fracture with the propping agent, and closing the fracture on the propping agent after closing the well, so that a sand filling fracture with a certain geometric dimension and high flow conductivity is formed in the stratum near the bottom of the well, and the purpose of increasing the production and injection of the well is achieved.
In order to increase the sand suspension performance of the salt-resistant multifunctional fracturing fluid, an additive crosslinking agent is required to improve the performance of the salt-resistant multifunctional fracturing fluid, so that the construction difficulty and the labor cost are increased, and a demulsifier is added, so that the salt-resistant multifunctional fracturing fluid has various additives and is complicated to construct.
The inventor finds that the existing acidizing fracturing fluid, resistance reducing water and sand-carrying fracturing fluid belong to three different types of systems, all need to be prepared in advance, and cannot be prepared continuously on line at present; the application of the demulsifier to the oil field can be realized only by adding the demulsifier.
Disclosure of Invention
In order to solve or improve the problems in the prior art, the invention aims to provide a fracturing fluid stock solution, an acidizing fracturing fluid, resistance reducing water and sand carrying fracturing fluid and a preparation method thereof, and solves the problems that the existing fracturing fluid needs to be prepared in advance, a demulsifier is added, a cross-linking agent is needed, and the construction is complex.
In order to solve the technical problem that the existing fracturing fluid cannot realize one dose with multiple purposes, the embodiment of the invention adopts the technical scheme that:
a fracturing fluid stock solution is formed by polymerizing emulsion, wherein the emulsion is formed by mixing a water phase and an oil phase;
the water phase comprises the following components in percentage by weight: 17-20% of acrylamide, 9-10% of sodium acrylate, 9-10% of AMPS sodium salt, 3-4% of N, N' -diacetone propionamido ethylenediamine, 1-3% of functional monomer DMC and the balance of water; the water phase is weakly acidic;
the oil phase consists of the following components: white oil and an emulsifier.
Further, the oil phase consists of the following components in percentage by weight: 85% of No. 10 white oil, 8010% of emulsifier span and 605% of Tween.
Further, the weight ratio of the aqueous phase to the oil phase is 3: 7.
Furthermore, the fracturing fluid stock solution also comprises a molecular weight regulator and a metal ion removing agent; the initiator for the polymerization reaction is a mixture of ammonium persulfate and sodium bisulfite; the molecular weight regulator is a mixture of sodium formate and urea.
The preparation method of the fracturing fluid stock solution comprises the following steps:
s1, preparing a water phase: mixing the components of the water phase, completely dissolving the components in deionized water, adding a molecular weight regulator, and regulating the pH value to 6.3-6.4 to obtain the water phase;
s2, oil phase preparation: fully mixing the components of the oil phase to obtain the oil phase;
s3, preparing a fracturing fluid stock solution: and stirring and mixing the water phase and the oil phase until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99% for at least 30min, reducing the temperature of the system to 10 ℃, starting adding a composite initiator ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished and cooling to room temperature to obtain the fracturing fluid stock solution.
The acidizing fracturing fluid consists of the following components in percentage by weight: the composite material comprises the following components in percentage by weight: 1.0-2.0% of emulsion, 1-1.5% of corrosion inhibitor, 0.5-1% of iron ion stabilizer, 0.1-0.3% of acid cleanup additive, 10-30% of acid and the balance of water, wherein the emulsion is the fracturing fluid stock solution, and the acid is hydrochloric acid or solid acid.
Further, the paint comprises the following components in percentage by weight: 2% of emulsion, 1.5% of corrosion inhibitor, 0.5% of iron ion stabilizer, 0.2% of cleanup additive for acid, 20% of hydrochloric acid and the balance of water.
Further, the storage temperature of the acidified fracturing fluid is not higher than 130 ℃.
The preparation method of the acidizing fracturing fluid comprises the following steps: and uniformly stirring all the components of the acidizing fracturing fluid to obtain the acidizing fracturing fluid.
It is another object of the present invention to provide a water-reducing water.
The water reducing and blocking agent consists of the following components in percentage by weight: 0.04-0.12% of emulsion, 0.1-0.2% of cleanup additive, 0.2-0.5% of anti-swelling agent and the balance of water, wherein the mineralization degree of the water is less than 5 ten thousand ppm, and the emulsion is the fracturing fluid stock solution.
Furthermore, the paint comprises the following components in percentage by weight: 0.12 percent of emulsion, 0.2 percent of discharge aiding agent, 0.25 percent of anti-swelling agent and the balance of water.
The preparation method of the water reducing and blocking agent comprises the following steps: and uniformly stirring all the components of the water reducing and blocking water to obtain the water reducing and blocking water.
Another object of the present invention is to provide a sand-carrying fracturing fluid.
A sand-carrying fracturing fluid comprises the following components in percentage by weight: 1-2.5% of emulsion, 0.2-0.5% of anti-swelling agent, 0.15-0.4% of cleanup additive and the balance of water, wherein the emulsion is a fracturing fluid stock solution.
Further, the sand-carrying fracturing fluid consists of the following components in percentage by weight: 2% of emulsion, 0.4% of anti-swelling agent, 0.2% of cleanup additive and the balance of water, wherein the emulsion is a fracturing fluid stock solution.
Further, the storage temperature of the sand-carrying fracturing fluid is not higher than 150 ℃.
The preparation method of the sand-carrying fracturing fluid comprises the following steps: and uniformly stirring all the components of the sand-carrying fracturing fluid to obtain the sand-carrying fracturing fluid.
The preparation method of the fracturing fluid stock solution comprises the following steps:
s1, preparing a water phase: mixing the components of the water phase, completely dissolving the components in deionized water, adding a molecular weight regulator, and regulating the pH value to 6.3-6.4 to obtain the water phase;
s2, oil phase preparation: fully mixing the components of the oil phase to obtain the oil phase;
s3, preparing a fracturing fluid stock solution: and stirring and mixing the water phase and the oil phase until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99% for at least 30min, reducing the temperature of the system to 10 ℃, starting adding a composite initiator ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished and cooling to room temperature to obtain the fracturing fluid stock solution.
The invention has the beneficial effects that:
1. the invention provides a fracturing fluid stock solution, a preparation method thereof, an acidizing fracturing fluid, resistance reducing water and a sand-carrying fracturing fluid, wherein the fracturing fluid stock solution is mainly prepared from a water phase and an oil phase, and DMC monomers are added into the fracturing fluid stock solution, so that the acid resistance and the temperature resistance of the fracturing fluid stock solution are favorably enhanced.
2. The invention needs different fracturing fluid emulsions for preparing different acidizing fracturing fluids, water reducing and blocking fluids or sand suspending fracturing fluids, and solves the technical problems that the prior art can not continuously prepare the fluids on line, needs to prepare the fluids in advance, and can be used only by adding a demulsifier when being used in an oil field.
3. The fracturing fluid stock solution can realize self-crosslinking, a self-crosslinking monomer N, N '-diacetone propionamido ethylenediamine is added in the synthesis, the ketone carbonyl on the N, N' -diacetone propionamido ethylenediamine is utilized, a ketone carbonyl chain extender is used for enabling a polymer to generate reactions such as crosslinking grafting and the like, and a functional monomer DMC is introduced to greatly improve the acid resistance of the emulsion, so that the application of the emulsion in acid water quality is ensured, the solution can be continuously prepared, the formula can be adjusted at any time according to actual conditions in site construction, and the acidified fracturing fluid, the water-reducing fluid or the sand-carrying fracturing fluid is prepared.
Drawings
Fig. 1 is an external view of a fracturing fluid stock solution of example 12.
Fig. 2 is an external view of a sand-carrying fluid sand-carrying experiment in example 12.
FIG. 3 is a graph showing rheological property measurements of example 12.
FIG. 4 is an appearance diagram of the demulsification experiment of example 12.
FIG. 5 is a graph showing the friction resistance test in example 9.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
The weakly acidic in the present invention means that the pH value is 5.5 to 6.5. AMPS is 2-acrylamide-2-methylpropanesulfonic acid.
Example 1: preparation of fracturing fluid stock solution
The composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 1 below.
TABLE 1
| Name (R) | Quality (g) |
| Acrylamide | 238 |
| Acrylic acid sodium salt | 126 |
| AMPS sodium salt | 126 |
| N, N' - |
42 |
| DMC | 14 |
| Flake caustic soda | Proper amount of |
| Deionized water | 854 |
| pH | 6.3-6.4 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 2 below.
TABLE 2
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| Tween 60 | 30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 1 and the table 2 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 27 percent.
The obtained emulsion stock solution is dissolved in different water qualities in proportion for kinematic viscosity measurement, and the resistance reduction rate is measured by adopting a method of NBT14003.2-2016 test according to the energy industry standard at the normal temperature of the pipe diameter of 14mm and the flow rate of 11m/s, as shown in Table 3:
TABLE 3 determination of viscosity and drag reduction for emulsions of the invention
Example 2 preparation of fracturing fluid stock
The composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 4 below.
TABLE 4
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 5 below.
TABLE 5
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 4 and the table 5 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature to be not more than 40 ℃, and cooling to room temperature until the reaction is finished to obtain the fracturing fluid emulsion stock solution with the solid content of about 33 percent.
Dissolving the obtained emulsion stock solution in different water qualities in proportion to perform kinematic viscosity measurement, and measuring the resistance reduction rate by adopting a method of NBT14003.2-2016 test according to the energy industry standard at normal temperature with the pipe diameter of 14mm and the flow rate of 11m/s, wherein the method is shown in Table 6;
TABLE 6 determination of viscosity and drag reduction for emulsions of the invention
Example 3: preparation of fracturing fluid stock solution
The composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 7 below.
TABLE 7
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| Acrylic |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 8 below.
TABLE 8
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 7 and the table 8 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
Dissolving the obtained emulsion stock solution in different water qualities in proportion to perform kinematic viscosity measurement, and measuring the resistance reduction rate by adopting a method of NBT14003.2-2016 test according to the energy industry standard at normal temperature with the pipe diameter of 14mm and the flow rate of 11m/s, wherein the method is shown in Table 9;
TABLE 9 determination of viscosity and drag reduction for emulsions of the invention
Example 4 preparation of acidified fracturing fluid
The embodiment provides an acidizing fracturing fluid which comprises the following components in percentage by weight: 1% of fracturing fluid stock solution, 1% of corrosion inhibitor, 0.5% of iron ion stabilizer, 0.1% of cleanup additive for acid, 10% of acid and the balance of water, wherein the acid is solid acid;
the fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 10 below.
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| Acrylic |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 11 below.
TABLE 11
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 10 and the table 11 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, uniformly mixing the fracturing fluid stock solution and other raw materials in proportion to obtain the acidizing fracturing fluid.
EXAMPLE 5 preparation of acidified fracturing fluid
The embodiment provides an acidizing fracturing fluid which comprises the following components in percentage by weight: 2% of fracturing fluid stock solution, 1.5% of corrosion inhibitor, 1% of iron ion stabilizer, 0.3% of cleanup additive for acid, 30% of acid and the balance of water, wherein the acid is hydrochloric acid;
the fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 12 below.
TABLE 12
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| Acrylic |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 13 below.
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 12 and the table 13 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, uniformly mixing the fracturing fluid stock solution and other raw materials in proportion to obtain the acidizing fracturing fluid.
Example 6 preparation of acidified fracturing fluid
The embodiment provides an acidizing fracturing fluid which comprises the following components in percentage by weight: 2% of fracturing fluid stock solution, 1.5% of corrosion inhibitor, 0.5% of iron ion stabilizer, 0.2% of acid cleanup additive, 20% of hydrochloric acid and the balance of water;
the fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 14 below.
TABLE 14
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 15 below.
Watch 15
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the tables 14 and 15 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, uniformly mixing the fracturing fluid stock solution and other raw materials in proportion to obtain the acidizing fracturing fluid.
Example 7: preparation of antilipemic water
The embodiment provides a water reducing and blocking agent, which comprises the following components in percentage by weight: 0.04% of emulsion, 0.1% of cleanup additive, 0.2% of anti-swelling agent and the balance of water, wherein the mineralization degree of the water is less than 5 ten thousand ppm, and the emulsion is a fracturing fluid stock solution.
The fracturing fluid stock solution is formed by polymerizing emulsion, wherein the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 16 below.
TABLE 16
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| Acrylic |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 17 below.
TABLE 17
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 16 and the table 17 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing the fracturing fluid stock solution with other raw materials according to a proportion to obtain the antileakage water.
Example 8: preparation of antilipemic water
The embodiment provides a water reducing and blocking agent, which comprises the following components in percentage by weight: 0.12% of emulsion, 0.2% of cleanup additive, 0.5% of anti-swelling agent and the balance of water, wherein the mineralization degree of the water is less than 5 ten thousand ppm, and the emulsion is a fracturing fluid stock solution;
the fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 18 below.
Watch 18
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| Acrylic |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 19 below.
Watch 19
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 18 and the table 19 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing the fracturing fluid stock solution with other raw materials to obtain the water reducing and blocking agent.
Example 9: preparation of antilipemic water
The embodiment provides a water reducing and blocking agent, which comprises the following components in percentage by weight: 0.12% of fracturing fluid stock solution, 0.2% of cleanup additive, 0.25% of anti-swelling agent and the balance of water, wherein the mineralization degree of the water is less than 5 ten thousand ppm;
the fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 20 below.
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 21 below.
TABLE 21
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the table 20 and the table 21 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing the fracturing fluid stock solution with other raw materials according to a proportion to obtain the antileakage water.
The resistance reducing rate of the resistance reducing water of the embodiment is measured by adopting an energy industry standard NBT14003.2-2016 resistance reducing agent performance index and a test method; as shown in fig. 5. Specific friction test data are shown in table 22.
Table 22: friction resistance test data
As shown in Table 22, the 0.1% emulsion of this example was dissolved in 2% potassium chloride solution to measure an initial drag reduction of 79%, the drag reduction after 400s shearing was 78%, the 0.15% emulsion was measured in 15% hydrochloric acid solution to measure an initial drag reduction of 77%, and the drag reduction after 400s shearing was 72%, indicating better acid resistance, shear resistance and drag reduction.
Example 10: preparation of sand-carrying fracturing fluid
The embodiment provides a sand-carrying fracturing fluid which comprises the following components in percentage by weight: 1% of emulsion, 0.2% of anti-swelling agent, 0.15% of cleanup additive and the balance of water, wherein the emulsion is a fracturing fluid stock solution.
The fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase feed of the fracturing fluid emulsion stock is shown in table 23 below.
TABLE 23
| Name (R) | Quality (g) |
| Acrylamide | 280 |
| |
140 |
| AMPS sodium salt | 140 |
| N, N' -diacetoneamidoethylenediamine | 56 |
| DMC | 37 |
| Flake caustic soda | Proper amount of |
| Deionized water | 747 |
| pH | 6.2-6.3 |
| Sodium formate | 350mg |
| Urea | 3000mg |
| EDTA | 400mg |
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 24 below.
Watch 24
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the tables 23 and 24 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing the fracturing fluid stock solution with other raw materials according to a proportion to obtain the sand-carrying fracturing fluid.
Example 11:
the embodiment provides a sand-carrying fracturing fluid which comprises the following components in percentage by weight: 2.5% of emulsion, 0.5% of anti-swelling agent, 0.4% of cleanup additive and the balance of water, wherein the emulsion is a fracturing fluid stock solution.
The fracturing fluid stock solution is formed by polymerizing emulsion, the emulsion is formed by mixing a water phase and an oil phase, and the weight ratio of the oil phase to the water phase is 3: 7;
the composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 25 below.
TABLE 25
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 26 below.
Watch 26
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the raw materials of the oil phase and the water phase according to the raw materials in the tables 25 and 26 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent. S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing the fracturing fluid stock solution with other raw materials according to a proportion to obtain the sand-carrying fracturing fluid.
Example 12:
the embodiment provides a sand-carrying fracturing fluid which comprises the following components in percentage by weight: 2% of emulsion, 0.4% of anti-swelling agent, 0.2% of cleanup additive and the balance of water, wherein the emulsion is a fracturing fluid stock solution.
The composition of the aqueous phase of the fracturing fluid emulsion stock is shown in table 27 below.
Watch 27
The composition of the oil phase of the fracturing fluid emulsion stock is shown in table 28 below.
Watch 28
| Name (R) | Quality (g) |
| No. 10 white oil | 510 |
| |
60 |
| |
30 |
Weighing the oil phase and the water phase according to the raw materials in the table 27 and the table 28 respectively to prepare the oil phase and the water phase; according to the mass ratio of the oil phase to the water phase of 3:7 until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99 percent for at least 30min, reducing the temperature of the system to 10 ℃, starting adding composite initiators, namely ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished, and cooling to room temperature to obtain the fracturing fluid emulsion stock solution with the solid content of about 32 percent.
S1, dissolving the fracturing fluid stock solution into water according to a proportion, and uniformly mixing with other raw materials to obtain the sand-carrying fracturing fluid.
The appearance of the fracturing fluid stock solution prepared in this example is shown in fig. 1. After the sand-carrying fracturing fluid prepared by the method is added into 20-40 meshes of ceramsite according to the proportion of 40 percent and stands still for 30min, the appearance is shown in figure 2. As can be seen from FIG. 2, after the sand-carrying fracturing fluid of the embodiment is added into ceramsite and stands still for 30min, no sinking occurs, which indicates good sand-carrying performance.
The emulsion stock solution of example 12 is fully dissolved in different water qualities by using different concentrations to measure the kinematic viscosity, the viscosity is measured under the same condition with the emulsion which does not contain N, N' -diacetone propionamido ethylenediamine and DMC monomer in the existing market, and the drag reduction rate is measured by adopting the energy industry standard NBT14003.2-2016 drag reduction agent performance index and the test method; experiments show that the emulsion stock solution obtained by the invention can be fully and quickly dissolved in strong-acid and high-salinity water, and the emulsion without N, N' -diacetone propionamido ethylenediamine and DMC monomer can not be dissolved in a strong-acid medium to generate floccules.
Kinematic viscosity and friction test data for specific experimental data comparisons are shown in table 29:
table 29: viscosity measurement data and comparison data under different conditions and concentration conditions
The viscosity of the sand-carrying fracturing fluid of the embodiment is measured by national standards, wherein 11 in the left image of fig. 3 is a viscosity change curve, 12 is a temperature change curve, and 13 is a shear rate curve. As can be seen from the left image of FIG. 3, 1% of the emulsion was dissolved in water at 100 ℃ for 170s-1Under the condition, the viscosity is 60mPa.s after 60min,greater than 50mPa.s, which shows that the product has good temperature resistance and shear resistance; FIG. 3 shows the right graph of a 1.5% emulsion prepared in 15% hydrochloric acid at 60 deg.C for 170s-1The viscosity is more than 25mPa.s after 60min under the condition, which shows that the acid resistance of the coating is good. Rheological property test specific data are shown in table 30:
table 30: rheological Property test data
Adding 0.03% of a gel breaker ammonium persulfate into the sand-carrying fracturing fluid of the embodiment to thoroughly break the gel at a constant temperature of 60 ℃, and obtaining a gel breaking fluid and diesel oil which are respectively mixed according to the proportion of 1: 1 and 1: 3, demulsifying for 5 hours at the temperature of 70 ℃ after mixing and emulsifying, and showing the appearance as shown in figure 4. In fig. 4, 41 is the fracturing fluid and diesel oil of the sand-carrying fracturing fluid of this embodiment according to the following ratio of 1: 1, and fig. 4 shows that the gel breaking liquid of the sand-carrying fracturing fluid and diesel oil of the embodiment are mixed according to the ratio of 1: appearance of demulsification after 3. It can be seen from table 31 that the sand-carrying fracturing fluid of the present embodiment is mixed with diesel oil after breaking the gel, and the breaking fluid reaches 90%, indicating that the sand-carrying fracturing fluid system has good demulsification performance.
Table 31: data of demulsification experiment
In conclusion, the resistance-reducing water and sand-carrying fracturing fluid can realize self-crosslinking, and can be continuously prepared without preparing the fluid in advance. The fracturing fluid stock solution is simple in preparation method and convenient to use; the water-reducing and water-blocking or sand-carrying fracturing fluid has the advantages of better demulsification performance and quick dissolution time under the condition of not adding a demulsifier.
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 (10)
1. A fracturing fluid stock solution, which is characterized in that: is polymerized by emulsion, and the emulsion is formed by mixing water phase and oil phase; the water phase comprises the following components in percentage by weight: 17-20% of acrylamide, 9-10% of sodium acrylate, 9-10% of AMPS sodium salt, 3-4% of N, N' -diacetone propionamido ethylenediamine, 1-3% of functional monomer DMC and the balance of water; the water phase is weakly acidic;
the oil phase consists of the following components: white oil and an emulsifier.
2. The fracturing fluid stock solution of claim 1, wherein: the oil phase comprises the following components in percentage by weight: 85% of No. 10 white oil, 8010% of emulsifier span and 605% of Tween.
3. A fracturing fluid dope according to claim 1 or 2, wherein: the weight ratio of the water phase to the oil phase was 3: 7.
4. The fracturing fluid stock solution of claim 1, wherein: the fracturing fluid stock solution also comprises a molecular weight regulator and a metal ion removing agent; the initiator for the polymerization reaction is a mixture of ammonium persulfate and sodium bisulfite; the molecular weight regulator is a mixture of sodium formate and urea.
5. A method of preparing the fracturing fluid stock solution of any one of claims 1 to 4, wherein: the method comprises the following steps:
s1, preparing a water phase: mixing the components of the water phase, completely dissolving the components in deionized water, adding a molecular weight regulator, and regulating the pH value to 6.3-6.4 to obtain the water phase;
s2, oil phase preparation: fully mixing the components of the oil phase to obtain the oil phase;
s3, preparing a fracturing fluid stock solution: and stirring and mixing the water phase and the oil phase until the viscosity is 1100 +/-50 mPa.s, introducing nitrogen with the purity of 99.99% for at least 30min, reducing the temperature of the system to 10 ℃, starting adding a composite initiator ammonium persulfate and sodium bisulfite, controlling the reaction temperature not to exceed 40 ℃ until the reaction is finished and cooling to room temperature to obtain the fracturing fluid stock solution.
6. An acidizing fracturing fluid comprising the emulsion of claim 1 wherein: the composite material comprises the following components in percentage by weight: 1.0-2.0% of emulsion, 1-1.5% of corrosion inhibitor, 0.5-1% of iron ion stabilizer, 0.1-0.3% of acid cleanup additive, 10-30% of acid and the balance of water, wherein the emulsion is fracturing fluid stock solution, and the acid is hydrochloric acid or solid acid.
7. An acidizing fracturing fluid according to claims 5 to 6 wherein: the composite material comprises the following components in percentage by weight: 2% of emulsion, 1.5% of corrosion inhibitor, 0.5% of iron ion stabilizer, 0.2% of cleanup additive for acid, 20% of hydrochloric acid and the balance of water.
8. A water-reducing water comprising the emulsion of claim 1, characterized by: the composite material comprises the following components in percentage by weight: 0.04-0.12% of emulsion, 0.1-0.2% of cleanup additive, 0.2-0.5% of anti-swelling agent and the balance of water, wherein the mineralization degree of the water is less than 5 ten thousand ppm.
9. The resistance-reducing water according to claim 8, wherein: the composite material comprises the following components in percentage by weight: 0.12 percent of emulsion, 0.2 percent of discharge aiding agent, 0.25 percent of anti-swelling agent and the balance of water.
10. A sand-carrying fracturing fluid comprising the emulsion of claim 1, wherein: the composite material comprises the following components in percentage by weight: 1 to 2.5 percent of emulsion, 0.2 to 0.5 percent of anti-swelling agent, 0.15 to 0.4 percent of cleanup additive and the balance of water.
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